MAX712, MAX713 NiCd/NiMH Battery Fast-Charge Controllers

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The MAX712/MAX713 fast-charge Nickel Metal Hydride (NiMH) and Nickel Cadmium (NiCd) batteries from a DC source at least 1.5V higher than the maximum battery voltage. 1 to 16 series cells can be charged at rates up to 4C. A voltage-slope detecting analog-to-digital converter, timer, and temperature window comparator determine charge completion. The MAX712/MAX713 are powered by the DC source via an on-board +5V shunt regulator. They draw a maximum of 5µA from the battery when not charging. A low-side current-sense resistor allows the battery charge current to be regulated while still supplying power to the battery's load.

The MAX712 terminates fast charge by detecting zero voltage slope, while the MAX713 uses a negative voltage-slope detection scheme. Both parts come in 16-pin DIP and SO packages. An external power PNP transistor, blocking diode, three resistors, and three capacitors are the only required external components.

For high-power charging requirements, the MAX712/ MAX713 can be configured as a switch-mode battery charger that minimizes power dissipation. Two evaluation kits are available: Order the MAX712EVKIT-DIP for quick evaluation of the linear charger, and the MAX713EVKIT- SO to evaluate the switch-mode charger.

Key Features

Applications/Uses

Fast-Charge NiMH or NiCd Batteries
Voltage Slope, Temperature, and Timer Fast-Charge Cutoff
Charge 1 to 16 Series Cells
Supply Battery's Load While Charging (Linear Mode)
Fast Charge from C/4 to 4C Rate
C/16 Trickle-Charge Rate
Automatically Switch from Fast to Trickle Charge
Linear or Switch-Mode Power Control
5µA (max) Drain on Battery when Not Charging
5V Shunt Regulator Powers External Logic

	Cellular Phones
	Cordless Phones
	Handy-Terminals
	Laptop, Notebook, and Palmtop Computers
	Portable Stereos

Key Specifications: Battery Chargers

Part Number

Cell Chemistry

Number of NiMH or NiCd 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

Secondary Charge Termination

Charge Regulation

Features

EV-Kit

Package

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

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX712

NiMH

1
10
11
2
3
4
5
6
7
8
9

Resistor

Zero ΔV

Max. Temp.
Max. V
Timer

Linear
Switchmode

•	Stand Alone

•	Thermistor Input

•

Timer

Yes

Ceramic DIP/16
DICE SALES/0
PDIP/16
SOIC/16

Yes

-40 to +85
-55 to +125
0 to +70

$3.09 @ 1k

MAX713

NiCd
NiMH

-ΔV

$3.09 @ 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.