MAX8903A, MAX8903C, MAX8903D 2A 1-Cell Li+ DC-DC Charger for USB* and Adapter Power

Description

The MAX8903A/MAX8903C/MAX8903D are integrated 1-cell Li+ chargers and Smart Power Selectors™ with dual (AC adapter and USB) power inputs. The switch mode charger uses a high switching frequency to eliminate heat and allow tiny external components. It can operate 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, blocking diodes, or current-sense resistors are required.

The MAX8903A/MAX8903C/MAX8903D feature optimized smart power control to make the best use of limited USB or adapter power. Battery charge current and SYS output current limit are independently set. Power not used by the system charges the battery. Charge current and SYS output current limit can be set up to 2A while USB input current can be set to 100mA or 500mA. Automatic input selection switches the system from battery to external power. The DC input operates from 4.15V to 16V with up to 20V protection, while the USB input has a range of 4.1V to 6.3V with up to 8V protection.

The MAX8903A/MAX8903C/MAX8903D internally block current from the battery and system back to the DC and USB inputs when no input supply is present. Other features include prequal charging and timer, fast charge timer, overvoltage protection, charge status and fault outputs, power-OK monitors, and a battery thermistor monitor. In addition, on-chip thermal limiting reduces battery charge rate and AC adapter current to prevent charger overheating. The MAX8903A/MAX8903C/MAX8903D are available in a 4mm x 4mm, 28-pin thin QFN package.

An evaluation kit is available: MAX8903AEVKIT

Key Features

Applications/Uses

Efficient DC-DC Converter Eliminates Heat
4MHz Switching for Tiny External Components
Instant On—Works with No Battery or Low Battery
Dual Current-Limiting Input Circuits—AC Adapter or USB
- Automatic Adapter/USB/Battery Switchover to Support Load Transients
- 50mΩ System-to-Battery Switch
- Supports USB Spec
Thermistor Monitor
Integrated Current-Sense Resistor
No External MOSFETs or Diodes
4.1V to 16V Input Operating Voltage Range

	Mobile Internet Devices
	PDA, Palmtop, and Wireless Handhelds
	Personal Navigation Devices
	Portable Multimedia Players
	Smart Cell Phones
	Ultra Mobile PCs

Key Specifications: Battery Chargers

Part Number

Cell Chemistry

Lithium Ion Cells

Protected V_IN
(V)

Charging V_IN
(V)

Charge Rate Set by

Max. I_CHG
(A)

Charge Termination

Charge Regulation

Features

EV Kit

Oper. Temp.
(°C)

Package/Pins

Smallest Available Pckg.
(mm²)

Price

max

≥

max w/pins

See Notes

MAX8903A

Li-Ion

Li-Polymer

Preset

Resistor

Min. Charge Current

Switchmode

Dual USB/Adapter Input

Input Current Limit

Internal FET/Transistor

Smart Power Selector

Stand Alone

Thermal Die Regulation

Thermistor Input

Timer

USB Input

Yes

-40 to +85

TQFN/28

16.8

$2.55 @1k

See All Battery Chargers (60)

Reliability Reports


		Reliability Report: MAX8903A.pdf

		Show FIT data for:

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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: 1-6 of 6

MAX8903A

Free
Sample

Buy

Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8903AETI+T

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8903AETI+

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8903C

Free
Sample

Buy

Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8903CETI+

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8903CETI+T

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8903D

Free
Sample

Buy

Status

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8903DETI+

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8903DETI+T

Active

TQFN;28 pin;16.8 mm²
Outline Drawing: 21-0139 (PDF)
Land Pattern: 90-0035 (PDF)
Use pkgcode/variation: T2844+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

More Information

	New Product Press Release 2009-06-29
	Product Ad: Download

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