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FEATURES
DESCRIPTION
APPLICATIONS
VI
GND
EN
SW
FB
C1
4.7 µF
L1
10 µH
C2
10 µF
TPS62202
VI
2.5 V − 6 V VO
1.8 V / 300 mA
15
2
34
40
45
50
55
60
65
70
75
80
85
90
95
100
0.010 0.100 1 10 100 1000
Efficiency − %
EFFICIENCY
vs
LOAD CURRENT
IL −Load Current − mA
VO = 1.8 V
VI = 2.7 V
VI = 3.7 V
VI = 5 V
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
HIGH-EFFICIENCY, SOT23STEP-DOWN, DC-DC CONVERTER
•High Efficiency Synchronous Step-Down
The TPS6220x devices are a family of high-efficiencyConverter With up to 95% Efficiency
synchronous step-down converters ideally suited for•2.5-V to 6-V Input Voltage Range
portable systems powered by 1-cell Li-Ion or 3-cell•Adjustable Output Voltage Range From 0.7 V
NiMH/NiCd batteries. The devices are also suitableto V
I
to operate from a standard 3.3-V or 5-V voltage rail.•Fixed Output Voltage Options Available
With an output voltage range of 6 V down to 0.7 V•Up to 300 mA Output Current
and up to 300 mA output current, the devices areideal to power low voltage DSPs and processors•1-MHz Fixed Frequency PWM Operation
used in PDAs, pocket PCs, and smart phones.•Highest Efficiency Over Wide Load Current
Under nominal load current, the devices operate withRange Due to Power Save Mode
a fixed switching frequency of typically 1 MHz. At•15-µA Typical Quiescent Current
light load currents, the part enters the power savemode operation; the switching frequency is reduced•Soft Start
and the quiescent current is typically only 15 µA;•100% Duty Cycle Low-Dropout Operation
therefore, it achieves the highest efficiency over the•Dynamic Output-Voltage Positioning
entire load current range. The TPS6220x needs onlythree small external components. Together with the•Available in a 5-Pin SOT23 Package
SOT23 package, a minimum system solution size isachieved. An advanced fast response voltage modecontrol scheme achieves superior line and load•PDAs and Pocket PC
regulation with small ceramic input and output•Cellular Phones, Smart Phones
capacitors.•Low Power DSP Supply•Digital Cameras•Portable Media Players•Portable Equipment
Figure 1. Typical Application(Fixed Output Voltage Version)
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of TexasInstruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Copyright © 2002–2006, Texas Instruments IncorporatedProducts conform to specifications per the terms of the TexasInstruments standard warranty. Production processing does notnecessarily include testing of all parameters.
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3
2
4
5
DBV PACKAGE
(TOP VIEW)
1
VI
GND
EN
SW
FB
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may bemore susceptible to damage because very small parametric changes could cause the device not to meet its publishedspecifications.
ORDERING INFORMATION
(1)
T
A
OUTPUT VOLTAGE SOT23 PACKAGE SYMBOL
Adjustable TPS62200DBV PHKI1.2 V TPS62207DBV PJGI1.5 V TPS62201DBV PHLI1.6 V TPS62204DBV PHSI-40°C to 85°C
1.8 V TPS62202DBV PHMI1.875 V TPS62208DBV ALW2.5 V TPS62205DBV PHTI3.3 V TPS62203DBV PHNI
(1) The DBV package is available in tape and reel. Add R suffix (DBVR) to order quantities of 3000 parts.Add T suffix (DBVT) to order quantities of 250 parts
Terminal Functions
TERMINAL
I/O DESCRIPTIONNAME NO.
This is the enable pin of the device. Pulling this pin to ground forces the device into shutdown mode. Pulling thisEN 3 I
pin to Vin enables the device. This pin must not be left floating and must be terminated.This is the feedback pin of the device. Connect this pin directly to the output if the fixed output voltage version isFB 4 I used. For the adjustable version an external resistor divider is connected to this pin. The internal voltage divideris disabled for the adjustable version.GND 2 GroundSW 5 I/O Connect the inductor to this pin. This pin is the switch pin and is connected to the internal MOSFET switches.V
I
1 I Supply voltage pin
2
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_
+
_
+
_
+
_
+
_
+
REF
REF
Load Comparator
Skip Comparator
Current Limit Comparator
P-Channel
Power MOSFET
Driver
Shoot-Through
Logic
Control
Logic
Soft Start
1 MHz
Oscillator
Comparator S
R
N-Channel
Power MOSFET
Comparator High
Comparator Low
Comparator Low 2
V(COMP)
Sawtooth
Generator
VI
Undervoltage
Lockout
Bias Supply
_
+
Comparator High
Comparator Low
Comparator Low 2
Compensation
VREF = 0.5 V
R2
See Note
R1
VI
EN
SW
FB GND
Gm
DETAILED DESCRIPTION
OPERATION
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
FUNCTIONAL BLOCK DIAGRAM
For the adjustable version (TPS62200) the internal feedback divider is disabled and the FB pin is directly connectedto the internal GM amplifier
The TPS6220x is a synchronous step-down converter operating with typically 1-MHz fixed frequency pulse widthmodulation (PWM) at moderate to heavy load currents and in power save mode operating with pulse frequencymodulation (PFM) at light load currents.
During PWM operation the converter uses a unique fast response, voltage mode, controller scheme with inputvoltage feed forward. This achieves good line and load regulation and allows the use of small ceramic input andoutput capacitors. At the beginning of each clock cycle initiated by the clock signal (S), the P-channel MOSFETswitch is turned on, and the inductor current ramps up until the comparator trips and the control logic turns offthe switch. The current limit comparator also turns off the switch in case the current limit of the P-channel switchis exceeded. Then the N-channel rectifier switch is turned on and the inductor current ramps down. The nextcycle is initiated by the clock signal again turning off the N-channel rectifier and turning on the P-channel switch.
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POWER SAVE MODE OPERATION
Iskip v66 mA )Vin
160 W
Ipeak +66 mA )Vin
80 W
PFM Mode at Light Load Comparator High
Comparator Low
Comparator Low 2
PWM Mode at Medium to Full Load
1.6%
0.8%
VO
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
DETAILED DESCRIPTION (continued)The GM amplifier and input voltage determines the rise time of the Sawtooth generator; therefore any change ininput voltage or output voltage directly controls the duty cycle of the converter. This gives a very good line andload transient regulation.
As the load current decreases, the converter enters the power save mode operation. During power save mode,the converter operates with reduced switching frequency in PFM mode and with a minimum quiescent current tomaintain high efficiency.
Two conditions allow the converter to enter the power save mode operation. One is when the converter detectsthe discontinuous conduction mode. The other is when the peak switch current in the P-channel switch goesbelow the skip current limit. The typical skip current limit can be calculated as
During the power save mode the output voltage is monitored with the comparator by the thresholds comp lowand comp high. As the output voltage falls below the comp low threshold set to typically 0.8% above Voutnominal, the P-channel switch turns on. The P-channel switch is turned off as the peak switch current isreached. The typical peak switch current can be calculated:
The N-channel rectifier is turned on and the inductor current ramps down. As the inductor current approacheszero the N-channel rectifier is turned off and the P-channel switch is turned on again, starting the next pulse.The converter continues these pulses until the comp high threshold (set to typically 1.6% above Vout nominal) isreached. The converter enters a sleep mode, reducing the quiescent current to a minimum. The converterwakes up again as the output voltage falls below the comp low threshold again. This control method reduces thequiescent current typically to 15 µA and reduces the switching frequency to a minimum, thereby achieving thehigh converter efficiency. Setting the skip current thresholds to typically 0.8% and 1.6% above the nominaloutput voltage at light load current results in a dynamic output voltage achieving lower absolute voltage dropsduring heavy load transient changes. This allows the converter to operate with a small output capacitor of just 10µF and still have a low absolute voltage drop during heavy load transient changes. Refer to Figure 2 for detailedoperation of the power save mode.
Figure 2. Power Save Mode Thresholds and Dynamic Voltage Positioning
The converter enters the fixed frequency PWM mode again as soon as the output voltage falls below the complow 2 threshold.
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DYNAMIC VOLTAGE POSITIONING
SOFT START
LOW DROPOUT OPERATION 100% DUTY CYCLE
ENABLE
UNDERVOLTAGE LOCKOUT
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
DETAILED DESCRIPTION (continued)
As described in the power save mode operation sections and as detailed in Figure 2 , the output voltage istypically 0.8% above the nominal output voltage at light load currents, as the device is in power save mode. Thisgives additional headroom for the voltage drop during a load transient from light load to full load. During a loadtransient from full load to light load, the voltage overshoot is also minimized due to active regulation turning onthe N-channel rectifier switch.
The TPS6220x has an internal soft start circuit that limits the inrush current during start-up. This preventspossible voltage drops of the input voltage in case a battery or a high impedance power source is connected tothe input of the TPS6220x.
The soft start is implemented as a digital circuit increasing the switch current in steps of typically 60 mA,120 mA,240 mA and then the typical switch current limit of 480 mA. Therefore the start-up time mainly depends on theoutput capacitor and load current. Typical start-up time with 10 µF output capacitor and 200 mA load current is800 µs.
The TPS6220x offers a low input to output voltage difference, while still maintaining operation with the 100%duty cycle mode. In this mode, the P-channel switch is constantly turned on. This is particularly useful in batterypowered applications to achieve longest operation time by taking full advantage of the whole battery voltagerange. The minimum input voltage to maintain regulation, depending on the load current and output voltage, canbe calculated as
Pulling the enable low forces the part into shutdown, with a shutdown quiescent current of typically 0.1 µA. Inthis mode, the P-channel switch and N-channel rectifier are turned off, the internal resistor feedback divider isdisconnected, and the whole device is in shutdown mode. If an output voltage, which could be an externalvoltage source or super cap, is present during shutdown, the reverse leakage current is specified underelectrical characteristics. For proper operation the enable pin must be terminated and must not be left floating.
Pulling the enable high starts up the TPS6220x with the soft start as previously described.
The undervoltage lockout circuit prevents the device from misoperation at low input voltages. It prevents theconverter from turning on the switch or rectifier MOSFET under undefined conditions.
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ABSOLUTE MAXIMUM RATINGS
DISSIPATION RATING TABLE
RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
over operating free-air temperature (unless otherwise noted)
(1)
UNIT
Supply voltages, V
I
(2)
-0.3 V to 7.0 VVoltages on pins SW, EN, FB
(2)
-0.3 V to V
CC
+0.3 VContinuous power dissipation, P
D
See Dissipation Rating TableOperating junction temperature range, T
J
-40°C to 150°CStorage temperature, T
stg
-65°C to 150°CLead temperature (soldering, 10 sec) 260°C
(1) Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratingsonly, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operatingconditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.(2) All voltage values are with respect to network ground terminal.
T
A
≤25°C T
A
= 70°C T
A
= 85°CPACKAGE R
θJA
POWER RATING POWER RATING POWER RATING
DBV 250°/W 400 mW 220 mW 160 mW
MIN NOM MAX UNIT
Supply voltage, V
I
2.5 6.0 VOutput voltage range for adjustable output voltage version, V
O
0.7 V
I
VOutput current, I
O
300 mAInductor, L
(1)
4.7 10 µHInput capacitor, C
I
(1)
4.7 µFOutput capacitor, C
O
(1)
10 µFOperating ambient temperature, T
A
40 85 °COperating junction temperature, T
J
40 125 °C
(1) See the application section for further information.
V
I
= 3.6 V, V
O
= 1.8 V, I
O
= 200 mA, EN = VIN, T
A
= -40 °C to 85 °C, typical values are at T
A
= 25 °C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
V
I
Input voltage range 2.5 6.0 VI
Q
Operating quiescent current I
O
= 0 mA, Device is not switching 15 30 µAShutdown supply current EN = GND 0.1 1 µAUndervoltage lockout threshold 1.5 2.0 V
ENABLE
V
(EN)
EN high level input voltage 1.3 VEN low level input voltage 0.4 VI
(EN)
EN input bias current EN = GND or VIN 0.01 0.1 µA
POWER SWITCH
V
IN
= V
GS
= 3.6 V 530 690P-channel MOSFET on-resistance m ΩV
IN
= V
GS
= 2.5 V 670 850r
ds
(ON)
V
IN
= V
GS
= 3.6 V 430 540N-channel MOSFET on-resistance m ΩV
IN
= V
GS
= 2.5 V 530 660I
lkg_(P)
P-channel leakage current V
DS
= 6.0 V 0.1 1 µA
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TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
ELECTRICAL CHARACTERISTICS (continued)V
I
= 3.6 V, V
O
= 1.8 V, I
O
= 200 mA, EN = VIN, T
A
= -40 °C to 85 °C, typical values are at T
A
= 25 °C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
I
lkg_(N)
N-channel leakage current V
DS
= 6.0 V 0.1 1 µAI
(LIM)
P-channel current limit 2.5 V < Vin < 6.0 V 380 480 670 mA
OSCILLATOR
f
S
Switching frequency 650 1000 1500 kHz
OUTPUT
Adjustable output voltageV
O
TPS62200 0.7 V
IN
VrangeV
ref
Reference voltage 0.5 VTPS62200 V
I
= 3.6 V to 6.0 V, I
O
= 0 mA 0% 3%Feedback voltage
(1)
Adjustable V
I
= 3.6 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62207 V
I
= 2.5 V to 6.0 V, I
O
= 0 mA 0% 3%1.2 V V
I
= 2.5 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62201 V
I
= 2.5 V to 6.0 V, I
O
= 0 mA 0% 3%1.5 V V
I
= 2.5 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62204 V
I
= 2.5 V to 6.0 V, I
O
= 0 mA 0% 3%1.6 V V
I
= 2.5 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62202 V
I
= 2.5 V to 6.0 V, I
O
= 0 mA 0% 3%V
O
Fixed output voltage
(1)
1.8 V V
I
= 2.5 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62208 V
I
= 2.5 V to 6.0 V, I
O
= 0 mA 0% 3%1.875 V V
I
= 2.5 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62205 V
I
= 2.7 V to 6.0 V, I
O
= 0 mA 0% 3%2.5 V V
I
= 2.7 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%TPS62203 V
I
= 3.6 V to 6.0 V, I
O
= 0 mA 0% 3%3.3 V V
I
= 3.6 V to 6.0 V, 0 mA ≤I
O
≤300 mA -3% 3%Line regulation V
I
= 2.5 V to 6.0 V, I
O
= 10 mA 0.26 %/VLoad regulation I
O
= 100 mA to 300 mA 0.0014 %/mAI
lkg
Leakage current into SW pin Vin > Vout, 0 V ≤Vsw ≤Vin 0.1 1 µAI
lkg
(Rev) Reverse leakage current into pin SW Vin = open, EN = GND, V
SW
= 6.0 V 0.1 1 µA
(1) For output voltages ≤1.2 V a 22 µF output capacitor value is required to achieve a maximum output voltage accuracy of 3% whileoperating in power save mode (PFM mode)
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TYPICAL CHARACTERISTICS
Table of Graphs
40
45
50
55
60
65
70
75
80
85
90
95
100
0.010 0.100 1 10 100 1000
VO = 3.3 V
VI = 3.7 V
VI = 5 V
Efficency − %
IL − Load Current − mA
40
45
50
55
60
65
70
75
80
85
90
95
100
0.010 0.100 1 10 100 1000
Efficiency − %
IL −Load Current − mA
VO = 1.8 V
VI = 2.7 V
VI = 3.7 V
VI = 5 V
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
FIGURES
vs Load current 3,4,5ηEfficiency
vs Input voltage 6I
Q
No load quiescent current vs Input voltage 7f
s
Switching frequency vs Temperature 8V
o
Output voltage vs Output current 9r
ds
(on) - P-channel switch, vs Input voltage 10r
ds
(on)
r
ds
(on) - N-Channel rectifier switch vs Input voltage 11Line transient response 12Load transient response 13Power save mode operation 14Start-up 15
EFFICIENCY EFFICIENCYvs vsLOAD CURRENT LOAD CURRENT
Figure 3. Figure 4.
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40
45
50
55
60
65
70
75
80
85
90
95
100
0.010 0.100 1 10 100 1000
VO = 1.5 V
VI = 2.7 V
VI = 5 V
Efficency − %
IL − Load Current − mA
VI = 3.7V
70
75
80
85
90
95
100
2.50 3 3.50 4 4.50 5 5.50 6
VO = 1.8 V
IL = 150 mA
IL = 1 mA
IL = 300 mA
Efficiency − %
VI − Input Voltage − V
0
5
10
15
20
25
2.50 3 3.50 4 4.50 5 5.50 6
TA = 85°C
TA = 25°C
TA = −40°C
N0 Load Quiescent Current −
VI − Input Voltage − V
Aµ
1025
1030
1035
1040
1045
1050
1055
1060
1065
1070
1075
1080
−40 −30 −20−10 0 10 20 30 40 50 60 70 80
f − Frequency − kHz
TA − Temperature − °C
VI = 3.6 V
VI = 6 V
VI = 2.5 V
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
EFFICIENCY EFFICIENCYvs vsLOAD CURRENT INPUT VOLTAGE
Figure 5. Figure 6.
NO LOAD QUIESCENT CURRENT FREQUENCYvs vsINPUT VOLTAGE TEMPERATURE
Figure 7. Figure 8.
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0.2
0.3
0.4
0.5
0.6
0.7
0.8
2.5 3 3.5 4 4.5 5 5.5 6
TA = 85°C
TA = 25°C
TA = −40°C
VI − Input Voltage − V
rds(on) Ω− P-Channel Switch −
1.70
1.72
1.74
1.76
1.78
1.80
1.82
1.84
1.86
1.88
1.90
0 50 100 150 200 250 300
− Outrput Voltage − VVO
IO − Output Current − mA
PFM Mode
PWM Mode
VO
20 mV/div
VI
3.6 V to 4.6 V
200 µs/div
0.2
0.3
0.4
0.5
0.6
0.7
0.8
2.5 3 3.5 4 4.5 5 5.5 6
TA = 85°C
TA = 25°C
TA = −40°C
VI − Input Voltage − V
rDS(on) ΩN-Channel Switch —
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
OUTPUT VOLTAGE r
ds
(on) P-CHANNEL SWITCHvs vsOUTPUT CURRENT INPUT VOLTAGE
Figure 9. Figure 10.
r
ds
(on) P-CHANNEL SWITCH LINE TRANSIENT RESPONSEvsINPUT VOLTAGE
Figure 11. Figure 12.
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VO
50 mV/div
IO
3 mA to 270 mA
100 µs/div
VSW
5 V/div
IL
100 mA/div
VO
20 mV/div
2 µs/div
VO = 1.8 V/200 mA
Enable
2 V/div
IL
50 mA/div
VO
1 V/div
100 µs/div
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
LOAD TRANSIENT RESPONSE POWER SAVE MODE OPERATION
Figure 13. Figure 14.
START-UP
Figure 15.
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APPLICATION INFORMATION
ADJUSTABLE OUTPUT VOLTAGE VERSION
Vout +0.5 V ǒ1)R1
R2Ǔ
C1 +1
2 p 10 kHz R1
C2 +R1
R2 C1
VI
GND
EN
SW
FB
C3
4.7 µF
L1
10 µH
C4
10 µF
TPS62200
VI
2.5 V − 6 V VO
1.8 V / 300 mA
R1
470k
R2
180k
C1
33 pF
C2
100 pF
INDUCTOR SELECTION
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
When the adjustable output voltage version TPS62200 is used, the output voltage is set by the external resistordivider. See Figure 16 .
The output voltage is calculated as
•R1 + R2 ≤1 M Ωand internal reference voltage V(ref)typ = 0.5 V
R1 + R2 should not be greater than 1 M Ωfor reasons of stability. To keep the operating quiescent current to aminimum, the feedback resistor divider should have high impedance with R1+R2 ≤1 M Ω. Because of the highimpedance and the low reference voltage of V
ref
= 0.5 V, the noise on the feedback pin (FB) needs to beminimized. Using a capacitive divider C1 and C2 across the feedback resistors minimizes the noise at thefeedback without degrading the line or load transient performance.
C1 and C2 should be selected as
•R1 = upper resistor of voltage divider•C1 = upper capacitor of voltage divider
For C1 a value should be chosen that comes closest to the calculated result.
•R2 = lower resistor of voltage divider•C2 = lower capacitor of voltage divider
For C2 the selected capacitor value should always be selected larger than the calculated result. For example, inFigure 16 for C2, 100 pF are selected for a calculated result of C2 = 86.17 pF.
If quiescent current is not a key design parameter, C1 and C2 can be omitted, and a low-impedance feedbackdivider must be used with R1+R2 <100 k Ω. This design reduces the noise available on the feedback pin (FB) aswell, but increases the overall quiescent current during operation.
Figure 16. Typical Application Circuit for the Adjustable Output Voltage
The TPS6220x device is optimized to operate with a typical inductor value of 10 µH.
For high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. Although theinductor core material has less effect on efficiency than its dc resistance, an appropriate inductor core materialmust be used.
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DIL+Vout 1–Vout
Vin
L fILmax +Ioutmax )
DIL
2
f = switching frequency (1 MHz typical, 650 kHz minimal)
L = inductor valfue
∆IL = peak-to-peak inductor ripple current
ILmax = maximum inducator current
INPUT CAPACITOR SELECTION
OUTPUT CAPACITOR SELECTION
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
APPLICATION INFORMATION (continued)The inductor value determines the inductor ripple current. The larger the inductor value, the smaller the inductorripple current, and the lower the conduction losses of the converter. On the other hand, larger inductor valuescause a slower load transient response. Usually the inductor ripple current, as calculated below, is around 20%of the average output current.
In order to avoid saturation of the inductor, the inductor should be rated at least for the maximum output currentof the converter plus the inductor ripple current that is calculated as
The highest inductor current occurs at maximum Vin.
A more conservative approach is to select the inductor current rating just for the maximum switch current of670 mA. Refer to Table 1 for inductor recommendations.
Table 1. Recommended Inductors
INDUCTOR VALUE COMPONENT SUPPLIER COMMENTS
10 µH Sumida CDRH5D28-100 High efficiency10 µH Sumida CDRH5D18-10010 µH Sumida CDRH4D28-10010 µH Coilcraft DO1608-1036.8 µH Sumida CDRH3D16-6R8 Smallest solution10 µH Sumida CDRH4D18-10010 µH Sumida CR32-10010 µH Sumida CR43-10010 µH Murata LQH4C100K04
Because the buck converter has a pulsating input current, a low ESR input capacitor is required. This results inthe best input voltage filtering and minimizing the interference with other circuits caused by high input voltagespikes. Also the input capacitor must be sufficiently large to stabilize the input voltage during heavy loadtransients. For good input voltage filtering, usually a 4.7 µF input capacitor is sufficient. It can be increasedwithout any limit for better input-voltage filtering. If ceramic output capacitors are used, the capacitor RMS ripplecurrent rating always meets the application requirements.
Ceramic capacitors show a good performance because of the low ESR value, and they are less sensitiveagainst voltage transients and spikes compared to tantalum capacitors.
Place the input capacitor as close as possible to the input pin of the device for best performance (refer toTable 2 for recommended components).
The advanced fast response voltage mode control scheme of the TPS6220x allows the use of tiny ceramiccapacitors with a value of 10 µF without having large output voltage under and overshoots during heavy loadtransients.
Ceramic capacitors with low ESR values have the lowest output voltage ripple and are therefore recommended.If required, tantalum capacitors may be used as well (refer to Table 2 for recommended components).
13Submit Documentation Feedback
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DVout +Vout 1–Vout
Vin
L f ǒ1
8 Cout f)ESRǓ
LAYOUT CONSIDERATIONS
VI
GND
EN
SW
FB
C1
4.7 µF
L1
10 µH
C2
10 µF
TPS62200
VI
2.5 V − 6 V VO
1.8 V / 300 mA
R1
R2
Cff
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
At nominal load current the device operates in PWM mode and the overall output voltage ripple is the sum of thevoltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and dischargingthe output capacitor:
where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents, the device operates in power save mode, and the output voltage ripple is independent ofthe output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typicaloutput voltage ripple is 1% of the output voltage Vo.
Table 2. Recommended Capacitors
CAPACITOR VALUE CASE SIZE COMPONENT SUPPLIER COMMENTS
4.7 µF 0805 Taiyo Yuden JMK212BY475MG Ceramic10 µF 0805 Taiyo Yuden JMK212BJ106MG CeramicTDK C12012X5ROJ106K Ceramic10 µF 1206 Taiyo Yuden JMK316BJ106KL CeramicTDK C3216X5ROJ106M22 µF 1210 Taiyo Yuden JMK325BJ226MM Ceramic
For all switching power supplies, the layout is an important step in the design, especially at high peak currentsand switching frequencies. If the layout is not carefully done, the regulator shows stability problems as well asEMI problems.
Therefore use wide and short traces for the main current paths, as indicated in bold in Figure 17 . The inputcapacitor, as well as the inductor and output capacitor, should be placed as close as possible to the IC pins
The feedback resistor network must be routed away from the inductor and switch node to minimize noise andmagnetic interference. To further minimize noise from coupling into the feedback network and feedback pin, theground plane or ground traces must be used for shielding. This becomes very important especially at highswitching frequencies of 1 MHz.
Figure 17. Layout Diagram
14
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TYPICAL APPLICATIONS
VI
GND
EN
SW
FB
C1
4.7 µF
L1
10 µH
C2
10 µF
TPS62202
VI
2.5 V to 6 V VO
1.8 V/300 mA
1
2
3
5
4
VI
GND
EN
SW
FB
C1
4.7 µF
L1
4.7 µH
C2
22 µF
TPS62202
VI
2.5 V to 6 V VO
1.8 V/300 mA
1
2
3
5
4
VI
GND
EN
SW
FB
C3
4.7 µF
L1
10 µH
C4
10 µF
TPS62200
VI
2.5 V to 6 V VO
1.5 V/300 mA
R1
360 kΩ
R2
180 kΩ
C1
47 pF
C2
100 pF
1
2
3
5
4
TPS62200 , , TPS62201TPS62202 , TPS62203 , TPS62207TPS62204 , TPS62205 , TPS62208
SLVS417E – MARCH 2002 – REVISED MAY 2006
Figure 18. Li-Ion to 1.8 V Fixed Output Voltage Version
Figure 19. 1.8 V Fixed Output Voltage version Using 4.7µH Inductor
Figure 20. Adjustable Output Voltage Version Set to 1.5 V
15Submit Documentation Feedback
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS62200DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62200DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62200DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62200DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62201DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62201DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62201DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62201DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62202DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62202DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62202DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62202DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62203DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62203DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62203DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62203DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62204DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62204DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62204DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62204DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62205DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62205DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62205DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62205DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62207DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
PACKAGE OPTION ADDENDUM
www.ti.com 18-Sep-2008
Addendum-Page 1
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
TPS62207DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62207DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62207DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62208DBVR ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62208DBVRG4 ACTIVE SOT-23 DBV 5 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62208DBVT ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
TPS62208DBVTG4 ACTIVE SOT-23 DBV 5 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-1-260C-UNLIM
(1) The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
PACKAGE OPTION ADDENDUM
www.ti.com 18-Sep-2008
Addendum-Page 2
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
TPS62200DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62200DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62200DBVT SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62200DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62201DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62201DBVT SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62202DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62202DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62202DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62203DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62203DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62204DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62204DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62205DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62205DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62205DBVT SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62205DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62207DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 17-May-2012
Pack Materials-Page 1
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
TPS62207DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62208DBVR SOT-23 DBV 5 3000 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
TPS62208DBVR SOT-23 DBV 5 3000 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62208DBVT SOT-23 DBV 5 250 178.0 9.0 3.23 3.17 1.37 4.0 8.0 Q3
TPS62208DBVT SOT-23 DBV 5 250 179.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TPS62200DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS62200DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62200DBVT SOT-23 DBV 5 250 203.0 203.0 35.0
TPS62200DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62201DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS62201DBVT SOT-23 DBV 5 250 203.0 203.0 35.0
TPS62202DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS62202DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62202DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62203DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62203DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62204DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
PACKAGE MATERIALS INFORMATION
www.ti.com 17-May-2012
Pack Materials-Page 2
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
TPS62204DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62205DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS62205DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62205DBVT SOT-23 DBV 5 250 203.0 203.0 35.0
TPS62205DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62207DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62207DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62208DBVR SOT-23 DBV 5 3000 203.0 203.0 35.0
TPS62208DBVR SOT-23 DBV 5 3000 180.0 180.0 18.0
TPS62208DBVT SOT-23 DBV 5 250 180.0 180.0 18.0
TPS62208DBVT SOT-23 DBV 5 250 203.0 203.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 17-May-2012
Pack Materials-Page 3
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