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| 型号： | MAX8934GETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/29页 |
| 文件大小： | 0K |
| 描述： | IC LI BATT CHARGER DUAL 28TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 系列： | * |
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MAX8934G
Dual-Input Linear Charger, Smart Power Selector
with Advanced Battery Temperature Monitoring
General Description
The MAX8934G dual-input Li+/Li-Poly linear battery char-
ger with Smart Power Selector K safely charges a single
Li+/Li-Poly cell in accordance with JEITA* recommenda-
tions. The MAX8934G monitors the battery temperature
(T 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
2 is supported (see Figure 6 for details). An ultra-low I Q ,
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.
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-
Features
S Li+ Charger with Smart Power Selector, No
External MOSFETs Needed
S Monitors Battery Temperature and Adjusts Charge
Current and Termination Voltage Automatically
per JEITA Recommendations
S OT Flags System of a Hot Battery During
Discharge
S Ultra-Low I Q , Always-On 3.3V LDO
S Common or Separate USB and Adapter Inputs
S Automatic Adapter/USB/Battery Switchover
S Load Peaks in Excess of Adapter Rating are
Supported by Battery
S Input OVP to 16V (DC) and 9V (USB)
S 40m I SYS-to-BATT Switch
S Thermal Regulation Prevents Overheating
S 4.35V SYS Regulation Voltage
Ordering Information
dently set. Input power not used by the system charges
PART
TEMP RANGE
PIN-PACKAGE
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.
The MAX8934G provides a SYS output voltage of 4.35V.
Other features include overvoltage protection (OVP),
open-drain charge status and fault outputs, power-OK
MAX8934GETI+ -40 N C to +85 N C 28 Thin QFN-EP**
+ Denotes a lead(Pb)-free/RoHS-compliant package.
** EP = Exposed pad.
Typical Operating Circuit
monitors, charge timers, and a battery thermistor moni-
tor. Additionally, on-chip thermal limiting reduces the
3.3V ALWAYS-ON
LDO
battery charge-rate to prevent charger overheating.
The MAX8934G is available in a 28-pin, 4mm x 4mm,
TQFN package.
Applications
PDAs, Palmtop, and Wireless Handhelds
Portable Media, MP3 Players, and PNDs
AC
ADAPTER
DC
Q1
LINEAR
REGULATOR
CHARGE
CURRENT
Q3
SYS
LOAD
CURRENT
SYSTEM
LOAD
Digital Still Cameras and Digital Video Cameras
CHARGE
Handheld Game Systems
USB
USB Q2
AND
SYS LOAD
SWITCH
BATT
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
GND
Smart Power Selector is a trademark of Maxim Integrated
Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-5296; Rev 0; 6/10
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