MAX712

MAX712 的PDF资料

下载
,168K

MAX712 的货源和报价

MAX712 的相关技术信息

Description

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

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

Number of NiMH or NiCd cells

Cell Chemistry

Charge Rate

Charge Termination Method

Linear Mode

Switch Mode

Stand Alone

EV-Kit

Package

Operating Temp. Range (°C)

RoHS Available

Price

MAX712

1 10 11 12 13 14 15 16 2 3 4 5 6 7 8 9

NiMH

Fast Trickle

0 deltaV
Max Temp
Max Time
Max V

Yes

16/PDIP
16/SOIC

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

Yes

$3.09 @ 1k

MAX713

NiCd
NiMH

Max Temp
Max Time
Max V
Neg. deltaV

16/PDIP
16/SOIC

$3.09 @ 1k

Application Notes

App Note 86: Switch-Mode Battery Charger Delivers 5A - MAX713

App Note 149: Battery Charger Indicates Trickle Or Fast Charge - MAX713

App Note 426: One-Hour Battery Charger Has Switch-Mode PWM Control - MAX712, MAX713

App Note 523: Quick-Charge IC Routes Step-Up Switcher Output To Battery - MAX713

App Note 680: How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues - MAX712, MAX713

App Note 936: Add-On Circuit Preconditions Battery before Charging - MAX713

Notes and Comments

Linear or switch-mode operation, built-in termination algorithms, zero voltage slope (MAX712)

Negative Voltage Slope (MAX713)

Temperature and Timer Cutoffs