MAX1640, MAX1641 Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

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Data Sheet

FULL DATA SHEET (PDF, 208kB)
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Description

The MAX1640/MAX1641 CMOS, adjustable-output, switch-mode current sources operate from a +5.5V to +26V input, and are ideal for microprocessor-controlled battery chargers. Charging current, maximum output voltage, and pulse-trickle charge are programmed with external resistors. Programming the off-time modifies the switching frequency, suppressing undesirable harmonics in noise-sensitive circuits. The MAX1640's high-side current sensing allows the load to connect directly to ground, eliminating ground-potential errors. The MAX1641 incorporates a low-side current sense.

The MAX1640/MAX1641 step-down pulse-width-modulation (PWM) controllers use an external P-channel MOSFET switch and an optional, external N-channel MOSFET synchronous rectifier for increased efficiency. An internal low-dropout linear regulator provides power for the internal reference and circuitry as well as the gate drive for the N-channel synchronous rectifier.

The MAX1640/MAX1641 are available in space-saving, 16-pin narrow QSOP packages.

Key Features Applications/Uses

95% Efficiency
+5.5V to +26V Input Supply Range
2V to 24V Adjustable-Output Voltage Range
100% Maximum Duty Cycle (Low Dropout)
Up to 500kHz PWM Operation
Optional Synchronous Rectifier
16-Pin QSOP Package
Current-Sense Accuracy:

2% (MAX1641)
5.3% (MAX1640)

Backup Battery Charger
Battery-Powered Applications
Cell Phones
Cordless Phones
Handy Terminals
Laptop, Notebook, and Palmtop Computers
PCS Phones
Portable Consumer Products

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

Charge Termination

Charge Regulation

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX1640

Li-Ion
Li-Polymer
NiCd
NiMH

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

1
2
3
4
5
6

2 to 24

Resistor

External Control

Switchmode

Yes

QSOP/16

Yes

-40 to +85

$2.75 @ 1k

MAX1641

$2.75 @ 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.

Diagram

MAX1640, MAX1641: Typical Operating Circuit
Typical Operating Circuit

Application Notes

Application Note 680: How to Design Battery Charger Applications that Require External Microcontrollers and Related System-Level Issues - MAX1640

Evaluation Kits

MAX1640EVKIT

Reliability Reports

Show FIT data for:

Request Reliability Report for:

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: 1-10 of 10

MAX1640 Free
Sample Buy

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1640C/D
DICE SALES;

Use pkgcode/variation: DICE*
See data sheet

MAX1640EEE
QSOP;13 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16-1*
-40°C to +85°C See data sheet

MAX1640EEE-T
QSOP;13 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16-1*
-40°C to +85°C See data sheet

MAX1640EEE+T
QSOP;16 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1640EEE+

QSOP;16 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1641 Free
Sample Buy

Package: TYPE PINS FOOTPRINT

DRAWING CODE/VAR *

Temp RoHS/Lead-Free?
Materials Analysis

MAX1641C/D
DICE SALES;

Use pkgcode/variation: DICE*
See data sheet

MAX1641EEE+

QSOP;16 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

MAX1641EEE-T

-40°C to +85°C See data sheet

MAX1641EEE
QSOP;13 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16-1*
-40°C to +85°C See data sheet

MAX1641EEE+T
QSOP;16 pin;
Dwg: 21-0055H (PDF)
Use pkgcode/variation: E16+1*
-40°C to +85°C RoHS/Lead-Free: Lead Free
Materials Analysis

Notes and Comments

Synchronous rectifier high-side current sensing (MAX1640)
Low-side current sensing (MAX1641)

Related Products

MAX745 Switch-Mode Lithium-Ion Battery-Charger
MAX846A Cost-Saving, Multichemistry, Battery Charger System
MAX1667 Chemistry-Independent, Level 2 Smart Battery Charger
MAX1782 Advanced Smart Battery-Pack Controller
MAX1647, MAX1648 Chemistry-Independent Battery Chargers

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Document Ref.: 19-1245; Rev 1; 2002-09-03
This page last modified: 2007-07-19