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MAX1551

Description
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers
File Size166KB,8 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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MAX1551 Overview

SOT23 Dual-Input USB/AC Adapter 1-Cell Li+Battery Chargers

19-2902; Rev 0; 7/03
SOT23 Dual-Input USB/AC Adapter 1-Cell Li+
Battery Chargers
General Description
The MAX1551/MAX1555 charge a single-cell lithium-ion
(Li+) battery from both USB* and AC adapter sources.
They operate with no external FETs or diodes, and
accept operating input voltages up to 7V.
On-chip thermal limiting simplifies PC board layout and
allows optimum charging rate without the thermal limits
imposed by worst-case battery and input voltage. When
the MAX1551/MAX1555 thermal limits are reached, the
chargers do not shut down, but progressively reduce
charging current.
The MAX1551 includes a
POK
output to indicate when
input power is present. If either charging source is
active,
POK
goes low. The MAX1555 instead features a
CHG
output to indicate charging status.
With USB connected, but without DC power, charge cur-
rent is set to 100mA (max). This allows charging from
both powered and unpowered USB hubs with no port
communication required. When DC power is connected,
charging current is set at 280mA (typ). No input-blocking
diodes are required to prevent battery drain.
The MAX1551/MAX1555 are available in 5-pin thin SOT23
packages and operate over a -40°C to +85°C range.
o
Charge from USB or AC Adapter
o
Automatic Switchover when AC Adapter is
Plugged In
o
On-Chip Thermal Limiting Simplifies Board
Design
o
Charge Status Indicator
o
5-Pin Thin SOT23 Package
o
Protected by U.S. Patent #6,507,172
Features
MAX1551/MAX1555
Ordering Information
PART
MAX1551EZK-T
MAX1555EZK-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 Thin SOT23-5
5 Thin SOT23-5
Selector Guide
PART
MAX1551EZK
MAX1555EZK
TOP MARK
ADRT
ADRU
FEATURES
POK
Output
CHG
Output
Applications
PDAs
Wireless Appliances
Cell Phones
Digital Cameras
Pin Configuration
TOP VIEW
USB
1
5
BAT
AC ADAPTER
3.7V TO 7V
DC
Typical Operating Circuit
BAT
TO SYSTEM
LOAD
Li+
GND
2
MAX1551
(MAX1555)
4
DC
USB
3.7V TO 6V
USB
CHARGE
CONTROL
TO LOGIC RAIL
POK
3
(CHG)
LOGIC
CONTROL
POK
(CHG)
THIN SOT23
MAX1551
(MAX1555)
GND
*Protected
by U.S. Patent #6,507,172.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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