MAX1640EEE ,Adjustable-Output / Switch-Mode Current Sources with Synchronous RectifierELECTRICAL CHARACTERISTICS(V = +12V, V = 6V, Circuit of Figure 2, T = 0°C to +85°C, unless otherwis ..
MAX1640EEE+ ,Adjustable-Output, Switch-Mode Current Sources with Synchronous RectifierEVALUATION KIT AVAILABLE
MAX1640EEE
Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier
_______________General DescriptionThe 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.
________________________ApplicationsBattery-Powered Equipment
Laptop, Notebook, and Palmtop Computers
Handy Terminals
Portable Consumer Products
Cordless Phones
Cellular Phones
PCS Phones
Backup Battery Charger
____________________________Features95% Efficiency+5.5V to +26V Input Supply Range2V to 24V Adjustable-Output Voltage Range100% Maximum Duty Cycle (Low Dropout)Up to 500kHz PWM OperationOptional Synchronous Rectifier16-Pin QSOP PackageCurrent-Sense Accuracy:2% (MAX1641)
5.3% (MAX1640)
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Sources with Synchronous Rectifier
__________________Pin Configuration
______________Ordering Information
__________Typical Operating Circuit
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= +12V, VOUT= 6V, Circuit of Figure 2, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Note 1:This ratio is generated by a 1:8 clock divider and is not an error source for current calculations.
IN to GND...............................................................-0.3V to +28V
LDOH to IN...............................................................+0.3V to -6V
LDOL to GND...........................................................-0.3V to +6V
PDRV to GND..............................(VLDOH- 0.3V) to (VIN+ 0.3V)
NDRV to GND.........................................-0.3V to (VLDOL+ 0.3V)
TOFF, REF, SET, TERM, CC to GND......-0.3V to (VLDOL+ 0.3V)
D0, D1 to GND.........................................................-0.3V to +6V
CS+, CS- to GND...................................................-0.3V to +28V
PGND to GND.....................................................................±0.3V
Continuous Power Dissipation (TA = +70°C)
QSOP (derate 8.30mW/°C above +70°C)...................667mW
Operating Temperature Range
MAX164_EEE...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec)............................+300°C
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
ELECTRICAL CHARACTERISTICS(VIN= +12V, VOUT= 6V, Circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)(VIN= +12V, VOUT= 6V, Circuit of Figure 2, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
__________________________________________Typical Operating Characteristics(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
____________________________Typical Operating Characteristics (continued)(Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
______________________________________________________________Pin Description
MAX1640/MAX1641
Adjustable-Output, Switch-Mode
Current Source with Synchronous RectifierFigure 1. MAX1640/MAX1641 Functional Diagram
