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MAX1640D fiches techniques PDF

Maxim Integrated - Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier

Numéro de référence MAX1640D
Description Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1640D fiche technique
19-1245; Rev 0; 7/97
EVAALVUAAILTAIOBNLEKIT
Adjustable-Output, Switch-Mode
Current Sources with Synchronous Rectifier
_______________General 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 har-
monics 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-modu-
lation (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.
________________________Applications
Battery-Powered Equipment
Laptop, Notebook, and Palmtop Computers
Handy Terminals
Portable Consumer Products
Cordless Phones
Cellular Phones
PCS Phones
Backup Battery Charger
__________________Pin Configuration
TOP VIEW
LDOL 1
TOFF 2
D1 3
D0 4
CC 5
REF 6
SET 7
TERM 8
MAX1640
MAX1641
16 IN
15 LDOH
14 PDRV
13 NDRV
12 PGND
11 CS+
10 CS-
9 GND
____________________________Features
o 95% Efficiency
o +5.5V to +26V Input Supply Range
o 2V to 24V Adjustable-Output Voltage Range
o 100% Maximum Duty Cycle (Low Dropout)
o Up to 500kHz PWM Operation
o Optional Synchronous Rectifier
o 16-Pin QSOP Package
o Current-Sense Accuracy: 2% (MAX1641)
5.3% (MAX1640)
______________Ordering Information
PART
MAX1640C/D
MAX1640EEE
MAX1641C/D
MAX1641EEE
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
PIN-PACKAGE
Dice*
16 QSOP
Dice*
16 QSOP
*Dice are specified at TA = +25°C, DC parameters only.
__________Typical Operating Circuit
VIN = +5.5V TO +26V
RTOFF
IN
D0
D1
TOFF
REF
LDOH
PDRV
NDRV
PGND
CS+
SET
CS-
MAX1640
CC
GND
TERM
LDOL
P
OUT
QSOP
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.

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