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參數(shù)資料
| 型號： | LM3655TLX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, BGA25 |
| 封裝： | 2.5 X 2.5 MM, MICRO SMD, 25 PIN |
| 文件頁數(shù)： | 1/21頁 |
| 文件大?。?/td> | 833K |
| 代理商： | LM3655TLX |
LM3655
Charge Control and Protection IC for embedded single
cell Li-Ion/Polymer batteries
1.0 General Description
The LM3655 provides complete charge control, discharge
control and battery safety of a single Lithium-Ion cell. It
supports battery charging by using a variety of power supply
types including unregulated current-limited wall adapters,
regulated wall adapters and vehicle power adapters. Charge
current control is achieved using an external bipolar PNP
power transistor.
Furthermore, the LM3655 provides effective and compre-
hensive discharge control functionality. All operating load
current is supplied by the Li-Ion battery and passes through
this IC. This allows the battery power to disconnect due to
overload, short-circuit or low battery conditions. The IC also
offers extensive battery safety protection against over-
voltage and over-current. The internal safety circuit is
backed up by an identical circuit to provide safety redun-
dancy. The LM3655 requires minimal external components
and is packaged in a micro surface mount device for inte-
gration in a single cell battery pack.
2.0 Key Specifications
n
1% precision pin-selectable nominal 4.10V and 4.16V
termination voltages
n
Up to 1.2A full-rate charge current
n
Safety Shunt voltage 4.35V
n
800 mW power regulation of external PNP at 25C
allows operation up to 30V (peak-to-peak) and 18V DC
3.0 Features
n
Input over-voltage protection for load and battery pack
n
Input over-current protection for load and battery pack
n
Reverse current protection
n
Reverse charger protection
n
Input short circuit protection that protects the cell from a
short on the charger-connector
n
Output overload current and short circuit protection
n
Complete charge control with pre-charging for depleted
batteries, full-rate and trickle charging.
n
Support for charging with regulated and non-regulated
wall adapters and vehicle power adapters.
n
Power regulation of the external Power PNP
n
Chemistry selection for Li-ion and Li-polymer
n
Complete linear Peak detector function for filtering ripple
on input power supply
n
Digital filtering of the cell voltage transients during
transmit pulses when LM3655 is used in a battery pack
for cell phones.
n
25-pin, 2.5 mm x 2.5 mm microSMD package for
mounting on four layered PCB inside the battery pack.
4.0 Applications
n
Cell phones and other portable applications which use
embedded Li-ion batteries
5.0 Typical Application Circuit
20111501
Because the LM3655 and associated external components provide safety protection for both the Li-Ion cell and the phone circuitry, appropriate precautions
must be taken in system design and layout to ensure proper operation.
November 2004
LM3655
Charge
Control
and
Protection
IC
for
embedded
single
cell
Li-Ion/Polymer
batteries
2004 National Semiconductor Corporation
DS201115
www.national.com
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