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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1641 Datasheet

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

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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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1641 Datasheet

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

No Preview Available !

Adjustable-Output, Switch-Mode
Current Source with Synchronous Rectifier
ABSOLUTE MAXIMUM RATINGS
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
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.
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.)
PARAMETER
SYMBOL
CONDITIONS
Input Voltage Range
Linear-Regulator Output
Voltage, VIN Referenced
VIN
VLDOH VIN = 5.5V to 26V, ILOAD = 0 to 20mA
Linear-Regulator Output
Voltage, Ground Referenced
VLDOL VIN = 5.5V to 26V, ILOAD = 0 to 20mA
Full-Scale Current-Sense
Threshold
Quarter-Scale Current-Sense
Threshold
Current-Sense Line Regulation
Output Current Compliance
Quiescent VIN Supply Current
Output Current in Off Mode
VLDOL Undervoltage Lockout
Reference Voltage
Reference Load Regulation
VSET Input Current
FET Drive Output Resistance
Off-Time Range
Off-Time Accuracy
Pulse-Trickle Mode Duty-Cycle
Period
MAX1640
MAX1641
MAX1640
MAX1641
VIN = VOUT + 0.5V to 26V
VOUT = 2V to 24V
MAX1640
MAX1641
D0 or D1 = high
D0 = D1 = low (off mode)
D0 = D1 = low
VREF
IREF = 0 to 50µA
PFET and NFET drive
RTOFF = 62k
D0 = low, D1 = high, RTOFF = 100k
Pulse-Trickle Mode Duty Cycle
(Note 1)
D0 = low, D1 = high, RTOFF = 100k
MIN
5.5
VIN -
5.5
4.5
142
147
36
34
4.05
1.96
1
1.7
27
TYP
VIN -
5.0
5.0
150
150
42
37.5
0.03
0.1
0.1
2
500
4.20
2.00
4
2.2
33
MAX
26
VIN -
4.5
UNITS
V
V
5.5 V
158
mV
153
48
mV
41
%/V
0.4
%/V
4 mA
µA
1 µA
4.35 V
2.04 V
10 mV
1 µA
12
10 µs
2.7 µs
40 ms
12.5 %
Note 1: This ratio is generated by a 1:8 clock divider and is not an error source for current calculations.
2 _______________________________________________________________________________________


Part Number MAX1641
Description Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier
Maker Maxim
Total Page 11 Pages
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