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Data Sheet

FULL DATA SHEET (PDF, 212kB) Download   E-Mail

Description

The MAX1551 and 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 and MAX1555 thermal limits are reached, the chargers do not shut down, but progressively reduce charging current. The MAX1551 includes an active-low POK output to indicate when input power is present. If either charging source is active, active-low POK goes low. The MAX1555 instead features a active-low CHG output to indicate charging status. With USB connected, but without DC power, charge current 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 and MAX1555 are available in 5-pin thin SOT23 packages and operate over a -40°C to +85°C range.

Key Features		Applications/Uses
Charge from USB or AC Adapter Automatic Switchover when AC Adapter is Plugged In On-Chip Thermal Limiting Simplifies Board Design Charge Status Indicator 5-Pin Thin SOT23 Package Protected by U.S. Patent #6,507,172		Cell Phones Digital Cameras PDAs Wireless Appliances

†Protected by U.S. Patent #6,507,172.

Diagram

Typical Operating Circuit

Application Notes

Application Note 3241: Charging Batteries Using USB Power - MAX1555

Evaluation Kits

none

Design Guides

POWER MANAGEMENT FOR BATTERY-POWERED EQUIPMENT (PDF)

Reliability Reports

Show FIT data for: MAX1551 MAX1555 Reliability Report: MAX1551EZK.pdf MAX1555EZK.pdf

Software/Models

none

Ordering Information
Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices: 1-8 of 8
MAX1551	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1551EZK+			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1551EZK			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1551EZK-T			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1551EZK+T			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1555	Free Sample	Buy	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX1555EZK+			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX1555EZK			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1555EZK-T			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX1555EZK+T			SOT-23;5 pin; Dwg: 21-0113 (PDF) Use pkgcode/variation: Z5+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

Topmark Coding: MAX1551 MAX1555 New Product Press Release 2003-08-15

Related Products

MAX1874 Dual-Input, USB/AC Adapter, 1-Cell Li+ Charger with OVP and Thermal Regulation MAX1925, MAX1926 Switch-Mode 1-Cell Li+ Chargers

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