Datasheet > SMB138A

SMB138A

更新时间： 2024-11-11 06:12:15

品牌	Logo	应用领域
SUMMIT		电池开关
页数	文件大小	规格书
2页	176K
描述
Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge

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中文翻译

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SMB138A 数据手册

SMB138/A/C

Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge™ Mode

and USB “On- the-Go” Power

FEATURES & APPLICATIONS

INTRODUCTION

The SMB138 is a programmable single-cell lithium-ion/lithium-polymer

battery charger designed for a variety of portable applications. The

device provides a simple and efficient way to charge high-capacity Li-

Ion batteries via a USB or AC adapter input. Unlike conventional

devices, the SMB138’s high-efficiency, switch-mode operation

eliminates the thermal problems of conventional linear solutions. Also

the buck converter architecture effectively multiplies the input current

to increase charge rate for the Li+ cell and uses current limited

supplies like USB more efficiently. The SMB138 also supports USB

On-the-Go devices by providing the required USB-OTG +5V power

supply using the Li-Ion battery as a source.

•

USB or AC input with programmable input current limiting

Up to 1.25A continuous charging current from AC adapter

Up to 750mA charging current from 500mA USB port using

automatic TurboCharge™ mode

•

+4.35 to +6.2V input voltage range (+16V tolerant)

Two product options:

SMB138A: charger off until I²C command initiation,

enable/disable control via I²C

SMB138C: charger powers up in charging mode,

enable/disable control via I²C

•

USB “On-the-Go” Power support for USB OTG enabled

devices (+5V reverse output @ 200mA)

The SMB138 can switch between USB mode and AC Adapter mode

and works seamlessly in conjunction with a USB controller. Charge

control includes qualification, trickle-charge, pre-charge, constant

current/constant voltage, float voltage and termination/safety settings

that are fully programmable via a serial I²C/SMBus and stored in non-

volatile memory making the device truly a flexible solution. Fast

charge current level can be set via I²C (limited in USB mode to ensure

100mA or 500mA input). Built-in is reverse-current blocking to prevent

inadvertent cell discharge. High frequency operation and integrated

power FETs contribute to reduced external component count and size.

•

Reverse current blocking (<5uA)

High-efficiency 3MHz voltage-mode step-down regulator

Integrated frequency compensation

Internal power MOSFETs and precision current sensing

High-accuracy float voltage regulation: 1%

Thermal regulation (current foldback)

Trickle charging

Pre-charge and complete-charge (36/240min) safety timers

CONFIDENTIAL

Digital programming of all major parameters via I²C interface

The SMB138A device requires a user I²C command for charging

initiation, whereas the SMB138C device powers up in the charging

mode. The SMB138C offers the option to automatically charge the

battery only when the battery voltage is below a selectable “dead-

battery” threshold.

Fast charge voltage threshold, float voltage

Pre-charge, fast charge, termination current

•

Status register monitors and flags charger operation

Charge in-progress/termination

Charge timer fault

DO NOT COPY

The SMB138 also offers several features that protect the battery pack

as well as the charger and input circuitry: over-current, under/over-

voltage and thermal protection. Ultra-accurate, 1% battery float

voltage control improves battery capacity utilization. The STAT output

is an interrupt to flag various status/flag events (programmable

selection) and the status register can be read via the serial port. The

SMB138 is available in an ultra-compact lead-free uCSP-19 package

and is rated over the –30C to +85C temperature range.

OC/UV/OV detection/shutdown

uCSP-19 lead-free package (0.4mm ball pitch)

Applications

•

2.5/3/3G+ GSM/CDMA/WCDMA Phones

Smartphones/PDAs

Portable Media Players

Portable GPS Terminals

SYSTEM APPLICATION

USB

Handheld System

500mA

4.35V-5.5V

USB-OTG Output

500mA

Total Output

550-1250mA

To system

System

USB

Li-Ion

SMB138

I2C

USB

AC/DC

300-1800mA

4.5V-6.2V

Figure 1 – Using the SMB138 to charge a single cell Li+ battery from USB or AC Adapter power sources

http://www.summitmicro.com/

3.0 4/5/2008

中文翻译

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与SMB138A相关器件

型号	品牌	获取价格	描述	数据表
SMB138B	SUMMIT	获取价格	Programmable Switch-mode, USB/AC Input Li+ Battery Charger with TurboCharge
SMB139	SUMMIT	获取价格	Programmable Linear Battery Charger in 1.3 x 2.1 uCSP
SMB1390	QUALCOMM	获取价格	SMB1390 is a divide-by-two charge pump, providing the highest efficiency for charging high
SMB1393/4	QUALCOMM	获取价格	The SMB1393 and SMB1394 are high-efficiency DIV/2 converters, designed for 1SnP high curre
SMB1395	QUALCOMM	获取价格	The SMB1395 is an auxiliary converter designed for 1SnP high current cable charging applic
SMB1396	QUALCOMM	获取价格	The SMB1396 is an auxiliary, dual input converter designed for 1SnP/2SnP high current wire
SMB1398	QUALCOMM	获取价格	The SMB1398 is an auxiliary converter designed for 1SnP/2SnP high current wireless/cable c
SMB13A	LITEON	获取价格	SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS
SMB13A	LGE	获取价格	600Watts Surface Mount Transient Voltage Suppressor
SMB13A	MIC	获取价格	SURFACE MOUNT TRANSIENT VOLTAGE SUPPRESSOR

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