1/17
XC6371/XC6372
Series
PWM,PWM/PFM Controlled Step-up DC/DC Converters
■GENERAL DESCRIPTION
The XC6371/ XC6372 series is a group of PWM controlle d and PWM/PF M controlled step-up DC/DC converters. T he built-i n
1.4Ω switching transistor type enabl es a step-up circ uit to be configur ed usin g onl y thr ee compo ne nts, a coil, a diode, and a
capacitor.
Output voltage can be selectable in the range from 2.0V to 7.0V in increments of 0.01V (accuracy:±2.5%). Oscillation
frequency is also selectable from 50kHz, 100kHz, and 180kHz (accuracy:±15%) for the XC6371 and the XC6372 series.
Soft-start time is internally set and offers protection against in-rush currents when the power is switched on and prevents
voltage overshoot. Packages with CE (chip enable) pin are also available which can reduce the IC power consumption
during during stand-by mode.
The XC6371 series is the standard PWM controlled products. The control of the XC6372 series switches from PWM to PFM
control during light loads when automatically switching is selected and the series is highly efficient from light loads to large
output currents.
■
A
PPLICATIONS
●Cellular phones, Pagers
●Palmtops
●Cameras, Video recorders
●Portable products
■
TYPICAL APPLICA TION CIRCUIT
■TYPICAL PERFORMANCE
CHARACTERISTICS
■FEATURES
Operation Start Voltage Range
: 0.9V~10V
Output Voltage Range : 2.0V~7.0V (0.1V increments)
Highly A ccurate : ±2.5%
Oscillation Frequency :
50kHz, 100kHz, 180kHz (
±
15%)
Maximum Output Currents
: 100mA(TYP.) @ VIN=3.0V, VOUT=5.0V *
Highly Efficient : 85%(TYP.) @ VIN=3.0V, VOUT=5.0V *
Built-in switching transistor.
CE pin type (XC6371C, XC6372C)
Phase compensation and soft start-up circuits built-in
CMOS Low Power Consumption
Packages : SOT-89, SOT-89-5, USP-6B
Environmentally Friendly: EU RoHS Compliant, Pb Free
* Performance depends on external components and PCB layout.
☆GreenOperation Compatible
ETR0402_004
2/17
XC6371/XC6372
Series
PIN NUMBER
SOT-89 USP-6B PIN NAME FUNCTION
1 6 VSS Ground
2 1 VOUT
Output Voltage Monitor/IC Internal Power Supply
3 4 Lx Switch
－ 2, 3, 5 NC No Connection
PIN NUMBER
SOT-89-5 USP-6B PIN NAME FUNCTION
5 6 VSS Ground
2 1 VOUT Output Voltage Monitor/IC Internal Power Supply
4 4 Lx Switch
3 3 CE Chip Enable
1 2, 5 NC No Connection
■PIN CONFIGURATION
■PIN
A
SSIGNMENT
XC6371/XC6372A
XC6371/XC6372C
*The dissipation pad for the USP-6B
package should be solder-plated in
recommended mount pattern and metal
masking so as to enhance mounting
strength and heat release. If the pad needs
to be connected to other pins, it should be
connected to the pin No.1.
3/17
XC6371/XC6372
Series
DESIGNATOR DESCRIPTION SYMBOL DESCRIPTION
A 3-pin DC/DC converter with built-in switching transistor
① Type of
DC/DC Converter C Stand-by capability with built-in switching transistor
②③ Output Voltage Integer e.g. VOUT=3.5V→②=3, ③=5
0 50kHz
1 100kHz
④ Oscillation Frequency 2 180kHz
SOT-89 (XC6371/72 A type)
PR SOT-89-5 (XC6371/72 C type)
SOT-89 (XC6371/72 A type)
PR-G SOT-89-5 (XC6371/72 C type)
DR USP-6B
⑤⑥-⑦ Packages
Taping Type (*2)
DR-G USP-6B
■PRODUCT CLASSIFICATION
●Selection Guide
●Ordering Information
START
XC6371A
PWM XC6371 Standard
Chip Enable XC6371C
Standard
Chip Enable
PWM/PFM XC6372 XC6372A
XC6372C
XC6371①②③④⑤⑥-⑦(*1) : PWM controlled
XC6372①②③④⑤⑥-⑦(*1) : PWM/PFM switching control
(*1) The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
(*2) The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office o
r
representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
4/17
XC6371/XC6372
Series
PARAMETER SYMBOL RATINGS UNITS
VOUT Input Voltage VOUT 12 V
LX pin Voltage VLX 12 V
LX pin Current ILX 400 mA
CE Input Voltage VCE 12 V
SOT-89,
SOT-89-5 500
Power Dissipation USP-6B Pd 100 mW
VDD Input Voltage VDD 12 V
Operating Temperature Range Topr -30~＋80 ℃
S torage Temperature Range Tstg -40~＋125 ℃
Ta=25℃
XC6371/72/73E
Note: The CE pin is only used with the XC6371C.
Note: Built-in transistor type units use the Lx pin.
■
A
BSOLUTE MAXIMUM RATINGS
■BLOCK DIAGRAMS
+
－
VLx limiter
Buffer
PWM Control
OSC 50/100 /180KHz
Chip Enable
CE
V
DD
(
p
)
Vref
So ft Start
Phas e co mp
Lx
V
SS
EXT
V
OUT
－
+
VL x limiter
Buffer
PWM Contro l
OSC 50/100 /180KHz
V
DD
Vref
Ph a se comp
Soft S tart
Lx
V
SS
EXT
V
DD
V
OUT
XC6371/XC6372A, C
(The VOUT pin serves also as VDD)
5/17
XC6371/XC6372
Series
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage VST1 External Components Connected, IOUT=1mA - - 0.90 V
Oscillation Start Voltage VST2 No external components. Apply voltage to VOUT
Lx : 10kΩ pull-up to 5V - - 0.80 V
No Load Input Current IIN VIN=VOUT×0.8, IOUT=0mA (*1) - 12.8 25.7
μA
Supply Current 1 IDD1 Same as VST2,
Apply output voltage×0.95 to VOUT - 80.2 133.8 μA
Supply Current 2 IDD2 Same as VST2,
Apply output voltage×1.1 to VOUT - 8.2 16.5
μA
Lx Switch-On
Resistance RSWON Same as IDD1, VLX=0.4V - 1.4 2.4
Ω
Lx Leak Current ILXL No external components. VOUT=VLX=10V - - 1.0
μA
Oscillation Frequency FOSC Same as IDD1. Measuring of Lx waveform 85 100 115 kHz
Maximum Duty Ratio MAXDTY Same as IDD1. Measuring of Lx waveform 80 87 92 %
PFM Duty Ratio (*4) PFMDTY Same as IDD1. Measuring of L x waveform 10 17 25 %
Lx Limit Voltage VLXLMT Same as IDD1. Apply output voltage to Lx,
Voltage required to produce FOSC×2 0.7 - 1.3 V
Efficiency EFFI - 85 - %
Slow-St art Time TSS 4.0 10.0 20.0 ms
■ELECTRICAL CHARACTERISTICS
NOTE: Unless otherwise stated, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit1
*1: The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0μA at reverse voltage (VR)=10.0V.(XC6372A)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically
operates which results in less average power consumption. The current actually provided by an external VIN source is represented by
"No Load Input Current (IIN)".
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372A )
XC6371/72A501 VOUT=5.0V
,
FOSC=100kHZ Ta=25℃
6/17
XC6371/XC6372
Series
PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS
Output Voltage VOUT 4.875 5.000 5.125 V
Maximum Input Voltage VIN 10 - - V
Operation Start Voltage V ST1 Exter nal Components Connected, IOUT=1mA - - 0.90 V
Operation Start Voltage V ST2 No external components. Apply voltage to VOUT,
Lx : 10kΩ pull-up to 5V - - 0.80 V
No Load Input Current IIN VIN=VOUT×0.8, IOUT=0mA (*1) - 12.8 25.7
μA
Supply Current 1 IDD1 Same as VST2,
Apply output voltage×0.95 to VOUT - 80.2 133.8 μA
Supply Current 2 IDD2 Same as VST2,
Apply output voltage×1.1 to VOUT - 8.2 16.5
μA
Lx Switch-On
Resistance RSWON Same as IDD1, VLx=0.4V - 1.4 2.4
Ω
Lx Leak Current ILXL No external components, VOUT =VLX=10V - - 1.0
μA
Oscillation Frequency FOSC Same as IDD1, Measuring of Lx waveform 85 100 115 kHZ
Maximum Duty Ratio MAXDTY Same as IDD1, Measuring of Lx waveform 80 87 92 %
PFM Duty Ratio (*4) PFMDTY Same as IDD1, Measuring of Lx waveform 10 17 25 %
Stand-by Current ISTB Same as IDD1 - - 0.5
μA
CE "High" Voltage VCEH Same as IDD1, Lx Oscillation start 0.75 - - V
CE "Low" Voltage VCEL Same as IDD1, Lx Oscillation stop - - 0.20 V
CE "High" Current ICEH Same as IDD1, VCE=VOUT×0.95 - - 0.25
μA
CE "Low" Current ICEL Same as IDD1, VCE=0V - - -0.25 μA
Lx Limit Voltage VLxLMT Same as IDD1, Apply output voltage to Lx,
Voltage required to produce FOSC×2 0.7 - 1.3 V
Efficiency EFFI - 85 - %
Slow-St art Time TSS 4.0 10.0 20.0 ms
XC6371/72C501 VOUT=5.0V, FOSC=100kHz Ta=25℃
NOTE: Unless otherwise stated, connect CE to VOUT, VIN=VOUT×0.6, IOUT=50mA. See Typical Application Circuits, Circuit 2.
*1: The Schottky diode (SD) must be type MA735, with reverse current (IR)<1.0μA at reverse voltage (VR)=10.0V.(XC6372C)
*2: "Supply Current 1" is the supply current while the oscillator is continuously oscillating. In actual operation the oscillator periodically
operates which results in less average power consumption. The current actually provided by an external VIN source is represent e d b y
"No Load Input Current (IIN)".
*3: When PWM operates at PWM Mode.
*4: When PFM operates at PFM Mode.(XC6372C)
■ELECTRICAL CHARACTERISTICS
(
Continued
)
7/17
XC6371/XC6372
Series
■TYPICAL APPRICA TION CIRCUITS
Circuit 1: XC6372A series Circuit 2: XC6372C series
L : 100μH (CR54, SUMIDA)
L : 100μH (CR54, SUMIDA) L : 100μH (CR54, SUMIDA)
SD : MA2Q735 (Schottky Diode; MATUSHITA)
CL : 16V47μF
(
Tantalum Ca
p
acitor, NICHICHEMI MCE
)
SD : MA2Q735 (Schottky Diode; MATUSHITA)
CL: 16V 47μF
(
Tantalum Ca
p
acitor, NICHICHEMI MCE
)
8/17
XC6371/XC6372
Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Output Voltage vs. Output Current
0.1 1 1 0 100 1000
L＝100μH（CR54），C
L
＝47μF（Tantalum）
Output Current:IOUT（mA）
XC6371A301PR
3.10
3.05
3.00
2.95
2.90
Output Voltage:VOUT（V）
2.7V
1.8V
1.5V
1.2V
V
IN
=1.0V
4.8
4.9
5.0
5.1
5.2
0.1 1 10 100 1000
XC6372A501P
R
3.0V
Output Voltage:V
OUT
（V）
Output Current:I
OUT
(mA)
L＝100μH（CＲ54），C
L
＝47μF（Tantalum）
1.5V 2.0V
4.0V
1.2V
V
IN
=0.9V
2.90
2.95
3.00
3.05
3.10
0.1 1 10 100 100
0
XC6372A301P
R
Output Voltage:V
OUT
（V）
Output Current:I
OUT
(mA)
V
IN
=0.9V 1.5V
2.7V
1.2V 1.8V
L＝100μH（CＲ54），C
L
＝47μF（Tantalum）
0.1 1 10 100 1000
L＝100μH(CR54),C
L
＝47μF(Tantalum)
Output Current:I
OUT
（mA）
XC6371A501P
R
5.2
5.1
5.0
4.9
4.8
Output Voltage:V
OUT
（V）
4.0V
3.0V
2.0V
1.5V1.2V
V
IN
=0.9V
1000
9/17
XC6371/XC6372
Series
(2) Efficiency vs. Output Current
■TYPICAL PERFORMANCE CHARACTERISTICS
(
Continued
)
0.1 1 10 100 100
0
L＝100μH(CR54),C
L
＝47μF(Tantalum)
Output Current:I
OUT
（mA）
XC6371A301P
R
100
80
60
40
20
0
Efficiency:EFFI(%)
2.7V
1.8 V
1.2V 1.5V
V
IN
=0.9V
0.1 1 10 100 100
0
L＝100μH(CR54),C
L
＝47μF(Tantalum)
Output Current:I
OUT
（mA）
XC6371A501P
R
100
80
60
40
20
0
Efficiency:EFFI(%)
4.0V
2.0V
1.2V 1.5V
V
IN
=0.9V 3.0V
1000 1000
10/17
XC6371/XC6372
Series
(3) Ripple Voltage vs. Output Current
■TYPICAL PERFORMANCE CHARACTERISTICS
(
Continued
)
0
20
40
60
80
100
0.1 1 10 100 100
0
V
IN
=0.9V
1.5V
XC6371A301P
R
1.2V
1.8V
2.7V
Ripple Voltage:V
r
（mVp-p）
L＝100μH(CR54),CL＝47μF(Tantalum)
Output Current:I
OUT
(mA)
1000
11/17
XC6371/XC6372
Series
(4) No Load Input Current vs. Input Voltage
■TYPICAL PERFORMANCE CHARACTERISTICS
(
Continued
)
0
100
200
300
400
500
01
XC6371A301PR
Input Current:I
IN
(μA)
Input Voltage:V
IN
(V)
L＝100μH（CＲ54），C
L
＝47μF（Tantalum）
23
0
50
100
150
200
012345
XC6372A501PR
Input Voltage:V
IN
(V)
Input Current:I
IN
(μA)
L＝100μH（CＲ54），C
L
＝47μF（Tantalum）
12/17
XC6371/XC6372
Series
(5) Operation Start Voltage / Hold Voltage vs. Output Current
(6) Load Transient Response
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
13/17
XC6371/XC6372
Series
■PACKAGING INFORMATION
●SOT-89 ●SO
T
-89-5
●USP-6B
14/17
XC6371/XC6372
Series
■PACKAGING INFORMATION (Continued)
●USP-6B Reference Pattern Layout ●USP-6B Reference Metal Mask Design
15/17
XC6371/XC6372
Series
MARK PRODUCT SERIES MARK PRODUCT SERIES
A XC6371A 1 XC6372A
A XC6371C 1 XC6372C
OSCILLATION FREQUENCY
OUTPUT VOLTAGE (V) 50kHz 100kHz 180kHz
1.x B 1 1
2.x C 2 2
3.x F 3 3
4.x E 4 4
5.x F 5 5
6.x H 6 6
7.x K 7 7
OSCILLATION FREQUENCY
OUTPUT VOLTAGE (V) 50kHz 100kHz 180kHz
x.0 0 0 A
x.1 1 1 B
x.2 2 2 C
x.3 3 3 D
x.4 4 4 E
x.5 5 5 F
x.6 6 6 H
x.7 7 7 K
x.8 8 8 L
x.9 9 9 M
■MARKING RULE
[XC6371/XC6372]
① represents product series
② represents integer of output voltage and oscillation frequency
③ represents decimal number of output voltage and oscillation frequ ency
④ represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excluded).
●SOT- 89, SOT-89-5
SOT-89
(TOP VIEW)
④③
②①
123
SOT-89-5
(
TOP VIEW
)
16/17
XC6371/XC6372
Series
MARK PRODUCT SERIES
5 XC6371xxxxDx
2 XC6372xxxxDx
MARK PRODUCT SERIES
A XC6371A
C XC6371C
MARK
③ ④ OUTPUT VOLTAGE (V)
3 3 3.3
5 0 5.0
MARK OSCILLATION FREQUENCY (kHz)
0 50
1 100
2 180
■MARKING RULE (Continued)
●USP-6B ① represents product series
②
r
e
p
resents
p
roduct classification
③④ represents output voltage (ex.)
⑤ represents oscillation frequency
⑥ represents production lot number
0 to 9, A to Z repeated (G, I, J, O, Q, W excluded)
Note: No character inversion use d.
USP-6B
(TOP VIEW)
[XC6371/XC6372] (Continued)
17/17
XC6371/XC6372
Series
1. The product s and product specifications cont ained herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this datasheet is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights ari sin g from the use of any information and circuitry in this datasheet.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing product s liste d in this datasheet.
4. The products in this datasheet are not developed, designed, or approved for use with
such equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this datasheet within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our re presentatives.
6. We assume no responsibility for damage or loss due to abnormal us e.
7. All rights reserved. No part of this datasheet may be copied or reproduced without the
prior permission of TOREX SEMICONDUCT OR LTD.
