MAX1873 Simple Current-Limited Switch-Mode Li+ Charger Controller

Description

The low-cost MAX1873R/S/T provides all functions needed to simply and efficiently charge 2-, 3-, or 4-series lithium-ion cells at up to 4A or more. It provides a regulated charging current and voltage with less than ±0.75% total voltage error at the battery terminals. An external P-channel MOSFET operates in a step-down DC-DC configuration to efficiently charge batteries in low-cost designs.

The MAX1873R/S/T regulates the battery voltage and charging current using two control loops that work together to transition smoothly between voltage and current regulation. An additional control loop limits current drawn from the input source so that AC adapter size and cost can be minimized. An analog voltage output proportional to charging current is also supplied so that an ADC or microcontroller can monitor charging current.

The MAX1873 may also be used as an efficient current-limited source to charge NiCd or NiMH batteries in multichemistry charger designs. The MAX1873R/S/T is available in a space-saving 16-pin QSOP package. Use the evaluation kit (MAX1873EVKIT) to help reduce design time.

Key Features

Applications/Uses

Low-Cost and Simple Circuit
Charges 2-, 3-, or 4-Series Lithium-Ion Cells
AC Adapter Input-Current-Limit Loop
Also Charges Ni-Based Batteries
Analog Output Monitors Charge Current
±0.75% Battery-Regulation Voltage
5µA Shutdown Battery Current
Input Voltage Up to 28V
200mV Dropout Voltage/100% Duty Cycle
Adjustable Charging Current
300kHz PWM Oscillator Reduces Noise
Space-Saving 16-Pin QSOP
MAX1873 Evaluation Kit Available to Speed Designs

	2-, 3-, or 4-Cell Li+ Battery Pack Chargers
	6-, 9-, or 10-Cell Li+ Battery Pack Chargers
	Desktop Cradle Chargers
	Handheld Instruments (PDAs, Palmtops)
	Notebook Computers
	Portable Desktop Assistants (PDAs)
	Portable Internet Tablets

Key Specifications: Battery Chargers

Part Number

Cell Chemistry

Number of NiMH or NiCd cells

Number of Lithium-Ion cells

Protected V_IN (max) (V)

Charging V_IN (max) (V)

Internal FET/Transistor

Charger (V)

Charge Rate Set by

Max. Charge Current (A)

Charge Termination

Charge Regulation

Features

EV-Kit

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1873

Li-Ion
Li-Polymer
NiCd
NiMH

10
5
6
7
8
9

2
3
4

8 to 17.6

Resistor

External Control

Switchmode

•	Input Current Limit

•	Stand Alone

Yes

QSOP/16

Yes

-40 to +85

$1.98 @ 1k

See All Battery Chargers (60)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Reliability Reports


		Show FIT data for:

		Reliability Report: MAX1873xEEE.pdf

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: 1-12 of 12

MAX1873

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX1873REEE

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873TEEE+

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1873SEEE+T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1873SEEE+

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1873REEE+T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1873REEE+

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1873TEEE-T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873TEEE

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873SEEE-T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873SEEE

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873REEE-T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX1873TEEE+T

QSOP;16 pin;31 mm²
Dwg: 21-0055G (PDF)
Use pkgcode/variation: E16+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis