JIANGSU CHANGJING ELECTRONICS TECHNOLOGY CO., LTD
1.1A 1.2MHz Synchronous Boost Converter
CJ9311 Series
INTRODUCTION:
FEATURES:
The CJ9311 devices provide a power supply
solution for products powered by either a
one-cell, two-cell, or three-cell alkaline, NiCd
or NiMH, or one-cell Li-ion or Li-polymer
battery. The boost converter is based on a
fixed frequency, pulse-width-modulation
(PWM) controller using a synchronous
rectifier to obtain maximum efficiency, which
contains an internal NMOS switch and
PMOS synchronous rectifier. The maximum
peak current in the boost switch is typically
limited to a value of 1.1A.
A switching frequency of 1.2MHz minimizes
solution footprint by allowing the use of tiny,
low profile inductors and ceramic capacitors.
The current mode PWM design is internally
compensated, reducing external parts count.
Anti-ringing control circuitry reduces EMI
concerns by damping the inductor in
discontinuous mode. In shutdown, VOUT and
VIN are connected, which allows the input
battery to be used for backup power. The
device features low shutdown current less
than 1μA.
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Up to 96% Efficiency
Delivers 100mA@3.3V from Single AA Cell
Delivers 300mA@5V from Two AA Cells
Delivers 600mA@5V from Single Li Cell
Maintains High Efficiency Over the Output
Current Range for Improved Battery Life
Low Voltage Start-Up: 0.85V
Continuous Switching at Light Loads
Internal Synchronous Rectifier
Current Mode Control with Internal
Compensation
1.2MHz Fixed Frequency Switching
Input Range: 0.9V to5V
Output Range:
2.5V to 4.5V (Up to 5V with Schottky)
Logic Controlled Shutdown(
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