XC6371/XC6372 Series ETR0402 004 PWM,PWM/PFM Controlled Step-up DC/DC Converters 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 1.4 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 FEATURES Operation Start Voltage Range : 0.9V~10V Cellular phones, Pagers Output Voltage Range : 2.0V~7.0V (0.1V increments) Highly Accurate : 2.5% Palmtops Oscillation Frequency : 50kHz, 100kHz, 180kHz (15%) Maximum Output Currents : 100mA(TYP.) VIN=3.0V, VOUT=5.0V * Cameras, Video recorders Highly Efficient : 85%(TYP.) VIN=3.0V, VOUT=5.0V * Built-in switching transistor. Portable products 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 PERFORMANCE TYPICAL APPLICATION CIRCUIT CHARACTERISTICS 1/17 XC6371/XC6372 Series PIN CONFIGURATION *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. PIN ASSIGNMENT XC6371/XC6372A PIN NUMBER PIN NAME FUNCTION SOT-89 USP-6B 1 6 VSS Ground 2 1 VOUT Output Voltage Monitor/IC Internal Power Supply 3 4 Lx Switch 2, 3, 5 NC No Connection XC6371/XC6372C PIN NUMBER PIN NAME FUNCTION SOT-89-5 USP-6B 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 2/17