MM1357

MITSUMI Control of Lithium Ion Batteries (switching regulator secondary) (two cells) MM1357 Control of Lithium Ion Batteries (switching regulator secondary) (two cells) Monolithic IC MM1357 Outline This IC is used to control two-cell chargers and the secondary side of switching regulators; it features enhanced functions for current switching and for overcharge detection and other kinds of protection. The control output is capable of driving a photocoupler LED. The charging current can be switched between high and low currents, and each can also be varied externally. Features 1. Charging voltage 2. Charging current (switchable between high and low levels, variable) 3. Reference voltage : Can be set externally High : 320mV typ. Low : 145mV typ. : 1.207V typ. Package SOP-14B Applications 1. Switching regulator 2. AC adapter 3. Lithium ion battery charger MITSUMI Control of Lithium Ion Batteries (switching regulator secondary) (two cells) MM1357 Block Diagram Pin Assignment 14 13 12 11 10 9 8 1234567 SIP-14B 1 OUT 8 CC OUT 2 CFB 9 S-GND 3 CSR 10 VFB+ 4 CC IN 11 VCC 5 ADJ1 12 REG OUT 6 P-GND 13 VREF 7 ADJ2 14 VFB- MITSUMI Control of Lithium Ion Batteries (switching regulator secondary) (two cells) MM1357 Pin Description Pin no. Pin name Input/output Function 1 OUT Output Output pin for charging control An external photocoupler is controlled for constant-current, constant-voltage charging control. Amp inverting input pin for current control 2 CF...