MAX1641EEE+ Maxim Integrated Products, MAX1641EEE+ Datasheet
MAX1641EEE+
Manufacturer Part Number
MAX1641EEE+
Description
IC SW-MODE CUR SOURCE ADJ 16QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1640EEE.pdf
(12 pages)
Specifications of MAX1641EEE+
Function
Charge Management
Voltage - Supply
5.5 V ~ 26 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.150", 3.90mm Width)
Number Of Outputs
1
Duty Cycle (max)
100 %
Output Voltage
2 V to 24 V
Mounting Style
SMD/SMT
Switching Frequency
500 KHz
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Synchronous Pin
No
Topology
Buck
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-1245; Rev 2; 5/09
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
__________________ Pin Configuration
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-
4642, or visit Maxim’s website at www.maxim-ic.com.
_______________General Description
TOP VIEW
Battery-Powered Equipment
Portable Consumer Products
Backup Battery Charger
Current Sources with Synchronous Rectifier
Laptop, Notebook, and Palmtop Computers
Handy Terminals
Cordless Phones
Cellular Phones
PCS Phones
TERM
LDOL
TOFF
REF
SET
CC
D1
D0
________________________________________________________________ Maxim Integrated Products
1
2
3
4
5
6
7
8
+
MAX1640
MAX1641
QSOP
16
15
14
13
12
11
10
9
Adjustable-Output, Switch-Mode
IN
LDOH
PDRV
NDRV
PGND
CS+
CS-
GND
*Dice are specified at T
+Denotes a lead(Pb)-free/RoHS-compliant package.
____________________________Features
♦ 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)
__________Typical Operating Circuit
______________Ordering Information
MAX1640C/D
MAX1640EEE+
MAX1641C/D
MAX1641EEE+
V
PART
IN
= +5.5V TO +26V
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@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( M
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 Y
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
D0
D1
TOFF
REF
SET
CC
A
0°C to +70°C
0°C to +70°C
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
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W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
= +25°C, DC parameters only.
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e 7 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y f V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X h @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
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@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e I ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X g @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X g @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 Y h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g O & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g O & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( M h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f 7 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f 7 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 Y
@ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 Y h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 M
IN
MAX1640
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( M I ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) K h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e W & @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h J @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e 7 @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h J @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y g @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( M g @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 0 Y f @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y e @ @ @ @ @ @ @ @ @ @ @ @
W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y e @ @ @ @ @ @ @ @ @ @ @ @
O & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 5 @ @ @ @ @ @ @ @ @ @ @ @
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W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h f V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 1 W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h e V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h e V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ h V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X h W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h e @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X h f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
LDOH
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X h f W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y h @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
LDOL
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ f I ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
O @ @ @ @ @ @ @ @ @ @ @ @ @ f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 6 X
PGND
5.3% (MAX1640)
NDRV
TERM
PDRV
CS+
CS-
V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ T & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ @ @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
V ' @ @ @ @ @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ H
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 5
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V ' @ @ @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
V 4 @ > @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X
S @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 5 h @ @ @ @ @ @ @ @ @ @ @ @ @ @ @
V ' @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ) X f @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ g W & @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ ( Y
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1
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MAX1641EEE+ Summary of contents
Page 1
... Maximum Duty Cycle (Low Dropout) ♦ 500kHz PWM Operation ♦ Optional Synchronous Rectifier ♦ 16-Pin QSOP Package ♦ Current-Sense Accuracy: 2% (MAX1641) ______________Ordering Information PART MAX1640C/D MAX1640EEE+ MAX1641C/D MAX1641EEE+ *Dice are specified at T +Denotes a lead(Pb)-free/RoHS-compliant package. __________Typical Operating Circuit V = +5.5V TO +26V ...
Page 2
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 .............................. (V LDOH NDRV to GND .........................................-0. ...
Page 3
Current Source with Synchronous Rectifier ELECTRICAL CHARACTERISTICS (continued +12V 6V, Circuit of Figure OUT PARAMETER SYMBOL PWM Maximum Duty Cycle Input Low Voltage Input High Voltage Input Leakage Current ELECTRICAL CHARACTERISTICS (V = ...
Page 4
Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier __________________________________________Typical Operating Characteristics (Circuit of Figure +25°C, unless otherwise noted.) A EFFICIENCY vs. OUTPUT VOLTAGE 100 V = 26V 18V 12V ...
Page 5
Current Source with Synchronous Rectifier ____________________________Typical Operating Characteristics (continued) (Circuit of Figure +25°C, unless otherwise noted.) A CURRENT-MODE CHANGE RESPONSE TIME A B 2ms/div V = 12V 1V 4Ω, NO OUTPUT CAPACITOR IN ...
Page 6
Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier _________________________________________________________ Functional Diagram IN REG A1 CS+ A2 CS- SET B MUX REF A SEL TERM D0 _______________________________________________________________________________________ LDOL LDOH Gm MODE CONTROL CC PDRV NDRV PGND MAX1640 MAX1641 TOFF ...
Page 7
Current Source with Synchronous Rectifier 0.33μF 47μF IN LDOH PDRV LDOL 4.7μF 0.1μF MAX1641 TOFF TOFF 1/2 IR7309 NDRV REF PGND R1 CS+ SET 0.1μF R2 CS- TERM CC GND 0.01μF Figure 1a. Standard Application Circuit _______________Detailed ...
Page 8
Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier The voltage at SET is given by 10kΩ < R2 < 300kΩ REF SET where and V is proportional to the REF ...
Page 9
Current Source with Synchronous Rectifier where and V is the desired output TERM OUT voltage. Programming the Off-Time When programming the off-time, consider such factors as maximum inductor current ripple, maximum output voltage, inductor value, and inductor ...
Page 10
Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier I/0 I/0 CH0 CH1 Figure 4. Microcontroller Battery Charger If an N-channel MOSFET synchronous rectifier is not used, a Schottky rectifier is needed. The MAX1640/ MAX1641’s high switching frequency demands a high- speed ...
Page 11
Current Source with Synchronous Rectifier Layout and Grounding Due to high current levels and fast switching wave- forms, proper PC board layout is essential. High-cur- rent ground paths should be connected in a star configuration to PGND. These traces should ...
Page 12
... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2009 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products ...