CM9112 Datasheet, PDF (1/18 Pages) California Micro Devices Corp – Dual Inputs Dual Outputs High Accurate Fast Charger

PRELIMINARY
CM9112
Dual Inputs Dual Outputs High Accurate Fast Charger
Features
• Monolithic linear charger requires no inductors,
external sense resistors or blocking diodes
• 4.75V to 6.50V operating input voltage range
• It can support up to 30V on Adaptor input and 7V
on USB input
• Up to 1.5A total system and charging current
• Provides power to the host system and charges
the battery at the same time
• Supports AC wall adapter and USB input
• 4.2V/450mA, available for host system under
Adapter input
• It provides 0.5% accuracy of CV mode for 4.2V
• An optional 0.1µF cap on CT pin programs 30 min./
60 min. timeout for Precharge/Termination.
• Two Thermal limits controls chip temperature and
prevents overheating
• Remote sensing pin for Battery voltage
• Pin to pin shortage protection
• Maximum of 1µA battery drain current
• Optional Battery thermistor (NTC) interface
• TQFN-16, RoHS compliant lead-free package
Applications
• Cellular phones and smart phones
• Pocket computers and PDAs
• Digital Still Camera
Product Description
The CM9112 is an integrated linear-mode charger for a
single-cell, Lithium-ion battery. It provides both charg­
ing current for the battery and power for the host sys­
tem. It can deliver charging current up to 1A and
system current up to 450mA at the same time. It takes
power either from AC Adapter or USB Adapter. When
both are present it automatically chooses AC Adapter
as input.
It requires no external blocking diodes or current sense
resistors and uses 2 external resistors to program dif­
ferent charging current under AC Adapter or USB
inputs.
The CM9112 provides Precharge Mode, Constant Cur­
rent Mode (Fast-charge), Constant Voltage Mode and
Termination by low current detection. Programmable
timeout for Precharge and Termination and Thermistor
interface to check Battery Temperature are optional
available to the users.
The CM9112 is protected against the use of a wrong
high voltage Adapter up to 30V. An antiringing protec­
tion on Adaptor input allows the use of a cheaper adap­
tor without need of a shock inductor.
Pin to pin shortage protection makes it friendly to the
users against accidental handling during mounting or
checking. The CM9112 is packaged into a miniature
16-pin TQFN package and operates between –40°C
and 85°C ambient.
Typical Application
AD
(AC
Adapter )
USB
Q1
10k
1k
1k
VIN STAT1 STAT2 VSYS
4k
GAD
VREF
Q2
33
VAD
VOUT
CM9112
USB
BSEN
GND
THERM
ENA ISET1 ISET2 CT
5k
2.5k ^0.1u
NTC
0.1u
4.2V/450mA
4.7u
© 2006 California Micro Devices Corp. All rights reserved.
07/06/06 490 N. McCarthy Blvd., Milpitas, CA 95035-5112 lTel: [phone] lFax: [phone] lwww.cmd.com
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