MAX8934G

更新时间： 2024-11-23 11:14:27

品牌	Logo	应用领域
美信 - MAXIM		电池监控
页数	文件大小	规格书
29页	2526K
描述
Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring

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MAX8934G 数据手册

19-5296; Rev 0; 6/10

Dual-Input Linear Charger, Smart Power Selector

with Advanced Battery Temperature Monitoring

General Description

Features

Li+ Charger with Smart Power Selector, No

The MAX8934G dual-input Li+/Li-Poly linear battery char-

ger with Smart Power SelectorK safely charges a single

Li+/Li-Poly cell in accordance with JEITA* recommenda-

tions. The MAX8934G monitors the battery temperature

External MOSFETs Needed

Monitors Battery Temperature and Adjusts Charge

Current and Termination Voltage Automatically

per JEITA Recommendations

BATT

) while charging, and automatically adjusts the

fast-charge current and charge termination voltage as the

battery temperature varies. The MAX8934G also monitors

the battery temperature while the battery is discharging,

and provides a warning flag (OT) to the system in the

event that the battery is over temperature. Safety region

OT Flags System of a Hot Battery During

Discharge

Ultra-Low I , Always-On 3.3V LDO

Common or Separate USB and Adapter Inputs

Automatic Adapter/USB/Battery Switchover

Load Peaks in Excess of Adapter Rating are

Supported by Battery

2 is supported (see Figure 6 for details). An ultra-low I ,

always-on LDO provides an additional 3.3V supply for

system power.

The MAX8934G operates with either separate inputs

for USB and AC adapter power, or from a single input

that accepts both. All power switches for charging and

switching the load between battery and external power

are included on-chip. No external MOSFETs are required.

Input OVP to 16V (DC) and 9V (USB)

40mI SYS-to-BATT Switch

Thermal Regulation Prevents Overheating

4.35V SYS Regulation Voltage

The MAX8934G features a Smart Power Selector to make

the best use of limited USB or adapter power. Input cur-

rent limit and battery charge current limit are indepen-

dently set. Input power not used by the system charges

the battery. Charge current limit and DC current limit can

be set up to 1.5A and 2A, respectively, while USB input

current can be set to 100mA or 500mA. Automatic input

selection switches the system load from battery to external

power.

Ordering Information

PART

MAX8934GETI+

TEMP RANGE

PIN-PACKAGE

-40NC to +85NC

28 Thin QFN-EP**

+Denotes a lead(Pb)-free/RoHS-compliant package.

**EP = Exposed pad.

The MAX8934G provides a SYS output voltage of 4.35V.

Typical Operating Circuit

Other features include overvoltage protection (OVP),

open-drain charge status and fault outputs, power-OK

monitors, charge timers, and a battery thermistor moni-

tor. Additionally, on-chip thermal limiting reduces the

battery charge-rate to prevent charger overheating.

The MAX8934G is available in a 28-pin, 4mm x 4mm,

TQFN package.

LDO

3.3V ALWAYS-ON

LINEAR

REGULATOR

SYS

ADAPTER

CHARGE

CURRENT

LOAD

CURRENT

SYSTEM

LOAD

Applications

PDAs, Palmtop, and Wireless Handhelds

Portable Media, MP3 Players, and PNDs

Digital Still Cameras and Digital Video Cameras

Handheld Game Systems

CHARGE

AND

SYS LOAD

SWITCH

USB Q2

BATT

GND

USB

BATTERY

*JEITA (Japan Electronics and Information Technology

Industries Association) Standard, A Guide to the Safe Use of

Secondary Lithium Ion Batteries on Notebook–Type Personal

Computers, April 20, 2007.

MAX8934G

Smart Power Selector is a trademark of Maxim Integrated

Products, Inc.

_______________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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