Document
XC6371/XC6372 Series
PWM,PWM/PFM Controlled Step-up DC/DC Converters
ETR0402_005
☆GreenOperation Compatible
■GENERAL DESCRIPTION
The XC6371/XC6372 series is a group of PWM controlled and PWM/PFM controlled step-up DC/DC converters. The built-in 1.4Ω switching transistor type enables a step-up circuit to be configured using only three components, 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.
■APPLICATIONS
●Smart phones / Mobile phones ●Note PCs / Tablet PCs ●Digital still cameras / Camcorders ●Mobile devices / terminals
■FEATURES
Operation Start Voltage Range : 0.9V~10V
Output Voltage Range : 2.0V~7.0V (0.1V increments)
Highly Accurate
: ±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.
■TYPICAL APPLICATION CIRCUIT ■TYPICAL PERFORMANCE CHARACTERISTICS
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XC6371/XC6372 Series
■PIN CONFIGURATION
■PIN ASSIGNMENT
XC6371/XC6372A
PIN NUMBER
SOT-89
USP-6B
1
6
2
1
3
4
-
2, 3, 5
PIN NAME
VSS VOUT
Lx NC
*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.
FUNCTION
Ground Output Voltage Monitor/IC Internal Power Supply
Switch No Connection
XC6371/XC6372C
PIN NUMBER
SOT-89-5
USP-6B
5
6
2
1
4
4
3
3
1
2, 5
PIN NAME
VSS VOUT
Lx CE NC
FUNCTION
Ground Output Voltage Monitor/IC Internal Power Supply
Switch Chip Enable No Connection
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■PRODUCT CLASSIFICATION
●Selection Guide
START
PWM XC6371
XC6371/XC6372
Series
Standard XC6371A Chip Enable XC6371C
PWM/PFM XC6372
Standard XC6372A Chip Enable XC6372C
●Ordering Information
XC6371①②③④⑤⑥-⑦(*1) : PWM controlled XC6372①②③④⑤⑥-⑦(*1) : PWM/PFM switching control
DESIGNATOR ①
DESCRIPTION Type of
DC/DC Converter
SYMBOL A C
DESCRIPTION 3-pin DC/DC converter with built-in switching transistor Stand-by capability with built-in switching transistor
②③
Output Voltage
Integer e.g. VOUT=3.5V→②=3, ③=5
④ ⑤⑥-⑦
Oscillation Frequency
Packages Taping Type (*2)
0 1 2
PR
PR-G DR
DR-G
50kHz 100kHz 180kHz SOT-89 (XC6371/72 A type) SOT-89-5 (XC6371/72 C type) SOT-89 (XC6371/72 A type) SOT-89-5 (XC6371/72 C type) USP-6B USP-6B
(*1)
The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully EU
RoHS compliant.
(*2)
The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact
your local Torex sales office or representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)
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XC6371/XC6372 Series
■BLOCK DIAGRAMS
XC6371/XC6372A, C
(The(VOUT pin servpes also as VDD)
Lx VLx limi ter
Buffer
)
Soft Start V re f
VDD
VSS EXT
PWM Control OSC 50/100/180KHz
Chip Enable
Phase comp
+ -
CE Note: The CE pin is only used with the XC6371C.
XC6371/72/73E
Lx
VSS EXT
VDD
VLx l imi ter Buffer
Soft Start V re f
PWM Control OSC 50/100/180KHz
Phase comp
+ -
VOUT
VDD VOUT
Note: Built-in transistor type units use the Lx pin.
■ABSOLUTE MAXIMUM RATINGS
PARAMETER
VOUT Input Voltage
LX pin Voltage
LX pin Current
CE Input Voltage
SOT-89,
Power Dissipation
SOT-89-5
USP-6B
VDD Input Voltage
Operating Temperature Range
Storage Temperature Range
SYMBOL VOUT VLX ILX VCE
Pd
VDD Topr Tstg
RATINGS 12 12 400 12
500
100 12 -30~+80 -40~+125
Ta=25℃ UNITS
V V mA V
mW
V ℃ ℃
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XC6371/XC6372
Series
■ELECTRICAL CHARACTERISTICS
XC6371/72A501
VOUT=5.0V, FOSC=100kHZ
PARAMETER
SYMBOL
CONDITIONS
Output Voltage
VOUT
Maximum Input Voltage
VIN
Operation Start Voltage VST1
External Components Connected, IOUT=1mA
Oscillation Start Voltage No Load Input Current
VST2 IIN
No external component.