June 2005 1 MIC5201
MIC5201 Micrel, Inc.
MIC5201
200mA Low-Dropout Regulator
General Description
The MIC5201 is an efficient linear voltage regulator with very
low dropout voltage (typically 17mV at light loads and 200mV
at 100mA), and very low ground current (1mA at 100mA
output), offering better than 1% initial accuracy with a logic
compatible on-off switching input.
Designed especially for hand-held battery powered devices,
the MIC5201 can be switched by a CMOS or TTL compatible
enable signal. This enable control may be connected directly
to VIN if unneeded. When disabled, power consumption
drops nearly to zero. The ground current of the MIC5201
increases only slightly in dropout, further prolonging battery
life. Key MIC5201 features include current limiting,
overtemperature shutdown, and protection against reversed
battery.
The MIC5201 is available in several fixed voltages and
accuracy configurations. It features the same pinout as the
LT1121 with better performance. Other options are available;
contact Micrel for details.
Features
•High output voltage accuracy
•Variety of output voltages
•Guaranteed 200mA output
•Low quiescent current
•Low dropout voltage
•Extremely tight load and line regulation
•Very low temperature coefficient
•Current and thermal limiting
•Reversed-battery protection
•Load-dump protection (fixed voltage versions)
•Zero off-mode current
•Logic-controlled electronic enable
•Available in SO-8 and SOT-223 packages
Applications
•Cellular telephones
•Laptop, notebook, and palmtop computers
•Battery powered equipment
•PCMCIA VCC and VPP regulation/switching
•Bar code scanners
•SMPS post-regulator/ dc-to-dc modules
•High-efficiency linear power supplies
MM8 is a trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Ordering Information
Part Number
Standard PbFree Voltage Junction Temp.* Package
MIC5201BM MIC5201YM Adj. –40ºC to +125ºC SO-8
MIC5201-3.0BM MIC5201-3.0YM 3.0V –40ºC to +125ºC SO-8
MIC5201-3.3BM MIC5201-3.3YM 3.3V –40ºC to +125ºC SO-8
MIC5201-5.0BM MIC5201-5.0YM 5.0V –40ºC to +125ºC SO-8
MIC5201-3.0BS MIC5201-3.0YS 3.0V –40ºC to +125ºC SOT-223
MIC5201-3.3BS MIC5201-3.3YS 3.3V –40ºC to +125ºC SOT-223
MIC5201-4.8BS MIC5201-4.8YS 4.8V –40ºC to +125ºC SOT-223
MIC5201-5.0BS MIC5201-5.0YS 5.0V –40ºC to +125ºC SOT-223
Other voltages available. Contact Micrel for details.
* Junction Temperature.
Typical Application
ENABLE
SHUTDOWN MIC5201-3.3
IN OUT
GND 1µF
VOUT
3.3V
EN
MIC5201 Micrel, Inc.
MIC5201 2 June 2005
Pin Configuration
MIC5201-x.xBS
SOT-223
Fixed
IN OUTGND
132
TAB
GND
1
2
3
4
8
7
6
5
IN
NC
NC
EN
OUT
ADJ
GND
NC
1
2
3
4
8
7
6
5
IN
NC
NC
EN
OUT
NC
GND
NC
MIC5201-x.xBM
8-Lead SOIC
Fixed
MIC5201BM
8-Lead SOIC
Adjustable
Pin Description
Pin No. Pin No. Pin No. Pin Name Pin Function
SOT-223 SO-8 Adj. SO-8 Fixed
311OUT Regulated Output
2ADJ Feedback Input: (Adjustable version only)
4, 6, 7 2, 4, 6, 7 NC not internally connected: Connect to ground plane for lowest thermal
resistance.
233GND Ground
55 EN Enable (Input): TTL compatible input. High = enable.
Low or open = off/disable.
188 V
IN Unregulated Supply Input
Absolute Maximum Ratings
Supply Input Voltage (VIN) Fixed .................. –20V to +60V
Supply Input Voltage (VIN) Adjustable .......... –20V to +20V
Enable Input Voltage (VEN) Fixed ................. –20V to +60V
Enable Input Voltage (VEN) Adjustable ......... –20V to +20V
Power Dissipation (PD)............................ Internally Limited
Junction Temperature (TJ)....................... –40°C to +125°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Operating Ratings
Supply Input Voltage (VIN) Fixed ................... 2.5V to +26V
Supply Input Voltage (VIN) Adjustable ........... 2.5V to +16V
Enable Input Voltage (VEN).................................. 0V to VIN
Junction Temperature (TJ)....................... –40°C to +125°C
June 2005 3 MIC5201
MIC5201 Micrel, Inc.
Electrical Characteristics
VIN = VOUT + 1V; IL = 100µA; CL = 3.3µF; VEN ≥ 2.0V; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +85°C; unless noted
Symbol Parameter Condition Min Typ Max Units
VOOutput Voltage Accuracy Variation from specified VOUT –1 1 %
–2 2 %
∆VO/∆TOutput Voltage Temperature Coef. Note 2 40 150 ppm/°C
∆VO/VOLine Regulation, Fixed VIN = VOUT + 1V to 26V 0.004 0.20 %
0.40 %
∆VO/VOLine Regulation, Adjustable VIN = VOUT + 1V to 16V 0.004 0.20 %
0.40 %
∆VO/VOLoad Regulation IL = 0.1mA to 200mA, Note 3 0.04 0.16 %
0.30 %
VIN – VODropout Voltage, Note 4 IL = 100µA17mV
IL = 20mA 130 mV
IL = 50mA 180 mV
IL = 100mA 225 mV
IL = 200mA 270 400 mV
IGND Quiescent Current VENABLE ≤ 0.7V (shutdown) 0.01 µA
IGND Ground Pin Current IL = 100µA130 µA
IL = 20mA 270 400 µA
IL = 50mA 500 µA
IL = 100mA 1000 2000 µA
IL = 200mA 3000 µA
PSRR Ripple Rejection 75 dB
IGNDDO Ground Pin Current at Dropout VIN = 0.5V less than specified VOUT,270 330 µA
IL = 100µA, Note 5
ILIMIT Current Limit VOUT = 0V 280 500 mA
∆VO/∆PDThermal Regulation Note 6 0.05 %/W
enOutput Noise 100 µV
Enable Input
VIL Input Voltage Level logic low (off) 0.7 V
VIH Input Voltage Level logic high (on) 2.0 V
IIL Enable Input Current VIL ≤ 0.7V 0.01 1µA
IIH Enable Input Current VIH ≤ 2.0V 15 50 µA
Reference (MIC5201 Adjustable Version Only)
VREF Reference Voltage 1.223 1.242 1.255 V
1.217 1.267 V
IIL Reference Voltage Temp. Coef. 20 ppm/°C
General Note: Devices are ESD sensitive. Handling precautions recommended.
Note 1: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when
operating the device outside of its rated operating conditions. The maximum allowable power dissipation is a function of the maximum junction
temperature, TJ(max), the junction-to-ambient thermal resistance, θJA, and the ambient temperature, TA. The maximum allowable power
dissipation at any ambient temperature is calculated using: P(max) = (T
J(max) –T
A) ÷ θJA. Exceeding the maximum allowable power dissipation
will result in excessive die temperature, and the regulator will go into thermal shutdown. The θJC of the MIC5201-x.xBS is 15°C/W and θJA for
the MIC5201BM is 160°C/W mounted on a PC board (see “Thermal Considerations” section for further details).
Note 2: Output voltage temperature coefficient is defined as the worst-case voltage change divided by the total temperature range.
Note 3: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 0.1mA to 200mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 4: Dropout Voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
Note 5: Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
Note 6: Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 200mA load pulse at VIN = 26V for fixed and VIN = 16V for adjustable at t = 10ms.
MIC5201 Micrel, Inc.
MIC5201 4 June 2005
Block Diagrams
Fixed Regulator (SOT-223 version only)
Fixed Regulator
Adjustable Regulator
Current Limit
Thermal Shutdown
IN OUT
GND
Bandgap
Ref.
C
OUT
V
OUT
V
IN
MIC5201-x.xBS
IN
EN
OUT
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OUT
V
IN
MIC5201-x.xBM
IN
EN
OUT
GND
V
REF
Bandgap
Ref.
Current Limit
Thermal Shutdown
C
OUT
V
OU
T
V
IN
R1
R2
MIC5201BM [adj.]
ADJ
June 2005 5 MIC5201
MIC5201 Micrel, Inc.
Typical Characteristics
0
50
100
150
200
250
0.01 0.1 1 10 100 1000
DROPOUT VOLTAGE (mV)
OUTPUT CURRENT (mA)
Dropout Voltage
vs. Output Current
0.0
0.1
0.2
0.3
0.4
-60 -30 0 30 60 90 120 150
DROPOUT VOLTAGE (V)
TEMPERATURE (°C)
Dropout Voltage
vs. Temperature
IL = 100mA
IL = 1mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0246810
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Dropout
Characteristics
IL = 100mA
IL = 100µA, 1mA
0.1
1
10
0.01 0.1 1 10 100
GROUND CURRENT (mA)
OUTPUT CURRENT (mA)
Ground Current
vs. Output Current
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
0246810
GROUND CURRENT (mA)
SUPPLY VOLTAGE (V)
Ground Current
vs. Supply Voltage
IL = 100mA
IL = 1mA
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0 0.1 0.2 0.3
OUTPUT VOLTAGE (V)
OUTPUT CURRENT (A)
Output Voltage
vs. Output Current
CIN = 2.2µF
COUT = 4.7µF
0.15
0.20
0.25
0.30
-60 -30 0 30 60 90 120 150
GROUND CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Temperature
I
LOAD
= 100µA
C
IN
= 2.2µF
C
OUT
= 4.7µF
1.0
1.1
1.2
1.3
1.4
1.5
-50 0 50 100 150
GROUND CURRENT (mA)
TEMPERATURE (°C)
Ground Current
vs. Temperature
I
LOAD
= 100mA
C
IN
= 2.2µF
C
OUT
= 4.7µF
-100
0
100
200
-5 051015 20 25 30 35
LOAD (mA)
TIME (ms)
Thermal Regulation
(3.3V Version)
-50
0
50
100
∆ OUTPUT (mV)
C
L
= 4.7 µF
3.0
3.1
3.2
3.3
3.4
3.5
3.6
-60 -30 0 30 60 90 120 150
OUTPUT VOLTAGE (V)
TEMPERATURE (°C)
Output Voltage vs. Temp.
(3.3V Version)
C
IN
= 2.2µF
C
OUT
= 4.7µF
3 DEVICES:
HI / AVG / LO
CURVES APPLICABLE
AT 100µA AND 100mA
100
120
140
160
180
200
220
240
260
280
300
-60 -30 0 30 60 90 120 150
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
Output Current
vs. Temperature
VOUT = 0V
(SHORT CIRCUIT)
VOUT = 3.3V
3.20
3.21
3.22
3.23
3.24
3.25
3.26
3.27
3.28
3.29
3.30
-60 -30 0 30 60 90 120 150
MIN. INPUT VOLTAGE (V)
TEMPERATURE (°C)
Minimum Input Voltage
vs. Temperature
C
IN
= 2.2µF
C
OUT
= 4.7µF
I
LOAD
= 1mA
MIC5201 Micrel, Inc.
MIC5201 6 June 2005
0
50
100
150
200
250
300
1234567
SHORT CIRCUIT CURRENT (mA)
INPUT VOLTAGE (V)
Short Circuit Current
vs. Input Voltage
C
IN
= 2.2µF
C
OUT
= 4.7µF
V
OUT
= 3.3V
-30
-20
-10
0
10
20
∆ OUTPUT (mV)
0
100
200
300
-2 0246810
OUTPUT (mA)
TIME (ms)
Load Transient
CL = 4.7µF
0
100
200
300
-10 010203040
OUTPUT (mA)
TIME (ms)
Load Transient
-30
-20
-10
0
10
20
∆ OUTPUT (mV)
CL = 47µF
0
20
40
60
80
100
120
012345678910
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
Supply Current vs. Supply
Voltage (3.3V Version)
R
L
= 33Ω
-10
-5
0
5
10
∆ OUTPUT (mV)
2
4
6
8
-0.2 0 0.2 0.4 0.6 0.8
INPUT (V)
TIME (ms)
Line Transient
CL = 1 µF
IL = 1mA
-5
0
5
10
15
∆ OUTPUT (mV)
2
4
6
8
-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6
INPUT (V)
TIME (ms)
Line Transient
C
L
= 10 µF
I
L
= 1mA
0
10
20
30
40
50
60
01234567
SUPPLY CURRENT (mA)
SUPPLY VOLTAGE (V)
Supply Current vs. Supply
Voltage (3.3V Version)
RL = 66Ω
-1
0
1
2
3
4
5
OUTPUT (V)
-2
0
2
4
-50 050100 150 200 250 300
ENABLE (V)
TIME (µs)
Enable Transient
(3.3V Version)
CL = 4.7 µF
IL = 1mA
-1
0
1
2
3
4
5
OUTPUT (V)
-2
0
2
4
-50 050100 150 200 250 300
ENABLE (V)
TIME (µs)
Enable Transient
(3.3V Version)
CL = 4.7 µF
IL = 100mA
-5
0
5
10
15
20
25
30
35
-60 -30 0 30 60 90 120 150
ENABLE CURRENT (µA)
TEMPERATURE (°C)
Enable Current Threshold
vs. Temperature
CIN = 2.2µF
COUT = 4.7µF
VEN
= 2V
VEN
= 5V
0.4
0.6
0.8
1
1.2
1.4
1.6
-60 -30 0 30 60 90 120 150
ENABLE VOLTAGE (V)
TEMPERATURE (°C)
Enable Voltage Threshold
vs. Temperature
C
IN
= 2.2µF
C
OUT
= 4.7µF
OFF
ON
0.001
0.01
0.1
1
10
100
1000
1x10
0
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
OUTPUT IMPEDANCE (Ω)
FREQUENCY (Hz)
Output Impedance
I
L
= 100µA
I
L
= 1mA
I
L
= 100mA
June 2005 7 MIC5201
MIC5201 Micrel, Inc.
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple
vs. Frequency
I
L
= 100µA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple
vs. Frequency
I
L
= 1mA
0
20
40
60
80
100
10x10
0
100x10
0
1x10
3
10x10
3
100x10
3
1x10
6
RIPPLE VOLTAGE (dB)
FREQUENCY (Hz)
Ripple
vs. Frequency
I
L
= 100mA
MIC5201 Micrel, Inc.
MIC5201 8 June 2005
Applications Information
Figure 1 shows a basic fixed-voltage application with the
unused enable input connected to VIN.
MIC5201-x.xBM
MIC5201-x.xBS
IN OUT
GND 1µF
V
IN
V
OU
T
EN
Figure 1. Fixed Application
Adjustable regulators require two resistors to set the output
voltage. See Figure 2.
MIC5201BM
IN OUT
GND
V
IN
EN ADJ
3.3µ
F
V
OUT
R1
R2
V1.242V 1 R2
R1
OUT =+
Figure 2. Adjustable Application
Resistors values are not critical because ADJ (adjust) has a
high impedance, but for best results use resistors of 470kΩ
or less.
Output Capacitors
A 1µF capacitor is recommended between the MIC5201
output and ground to prevent oscillations due to instability.
Larger values serve to improve the regulator’s transient
response. Most types of tantalum or aluminum electrolytics
will be adequate; film types will work, but are costly and
therefore not recommended. Many aluminum electrolytics
have electrolytes that freeze at about –30°C, so solid tanta-
lums are recommended for operation below –25°C. The
important parameters of the capacitor are an effective series
resistance of about 5Ω or less and a resonant frequency
above 500kHz. The value of this capacitor may be increased
without limit.
At lower values of output current, less output capacitance is
required for output stability. The capacitor can be reduced to
0.47µF for current below 10mA or 0.33µF for currents below
1mA.
Input Capacitors
A 1µF capacitor should be placed from the MIC5201 input to
ground if there is more than 10 inches of wire between the
input and the ac filter capacitor or if a battery is used as the
input.
Noise Reduction Capacitors
On adjustable devices, a capacitor from ADJ to GND will
decrease high-frequency noise on the output. See Figure 3.
MIC5201BM
IN OUT
GND
VIN
EN ADJ
3.3µ
F
VOUT
R1
R2 CADJ
Figure 3. Decreasing Ouput Noise
Minimum Load
The MIC5201 will remain stable and in regulation with no
load unlike many other voltage regulators. This is
especially important in CMOS RAM keep-alive
applications.
Dual-Supply Systems
When used in dual supply systems where the regulator
load is returned to a negative supply, the output voltage
must be diode clamped to ground.
Thermal Considerations Layout
The MIC5201-x.xBM (8-pin surface mount package) has the
following thermal characteristics when mounted on a single
layer copper-clad printed circuit board.
Multilayer boards having a ground plane, wide traces near the
pads, and large supply bus lines provide better thermal
conductivity.
The “worst case” value of 160°C/W assumes no ground
plane, minimum trace widths, and a FR4 material board.
Nominal Power Dissipation and Die Temperature
The MIC5201-x.xBM at a 25°C ambient temperature will
operate reliably at up to 625mW power dissipation when
mounted in the “worst case” manner described above. At an
ambient temperature of 55°C, the device may safely dissi-
pate 440mW. These power levels are equivalent to a die
temperature of 125°C, the recommended maximum tem-
perature for non-military grade silicon integrated circuits.
For MIC5201-x.xBS (SOT-223 package) heat sink character-
istics, please refer to Micrel Application Hint 17, P.C. Board
Heat Sinking.
245 mil
30 mil 50 mil
50 mil
150 mil
Figure 4. Min. Recommended SO-8 PCB Pads Size
PC Board
Dielectric
FR4 160ºC/W
Ceramic 120ºC/W
θθ
θθ
θJA
June 2005 9 MIC5201
MIC5201 Micrel, Inc.
Package Information
45°
0°–8°
0.244 (6.20)
0.228 (5.79)
0.197 (5.0)
0.189 (4.8) SEATING
PLANE
0.026 (0.65)
MAX)
0.010 (0.25)
0.007 (0.18)
0.064 (1.63)
0.045 (1.14)
0.0098 (0.249)
0.0040 (0.102)
0.020 (0.51)
0.013 (0.33)
0.157 (3.99)
0.150 (3.81)
0.050 (1.27)
TYP
PIN 1
DIMENSIONS:
INCHES (MM)
0.050 (1.27)
0.016 (0.40)
8-Pin SOP (M)
16°
10°
0.84 (0.033)
0.64 (0.025)
1.04 (0.041)
0.85 (0.033)
2.41 (0.095)
2.21 (0.087)
4.7 (0.185)
4.5 (0.177)
6.70 (0.264)
6.30 (0.248)
7.49 (0.295)
6.71 (0.264)
3.71 (0.146)
3.30 (0.130)
3.15 (0.124)
2.90 (0.114)
10°
MAX
0.10 (0.004)
0.02 (0.0008)
0.038 (0.015)
0.25 (0.010)
C
L
DIMENSIONS:
MM (INCH)
C
L
1.70 (0.067)
1.52 (0.060)
0.91 (0.036) MIN
SOT-223 (S)
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 1998 Micrel Incorporated
