MAX1644 Maxim, MAX1644 Datasheet
MAX1644
Manufacturer Part Number
MAX1644
Description
Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting
Manufacturer
Maxim
Datasheet
1.MAX1644.pdf
(11 pages)
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The MAX1644 constant-off-time, PWM step-down DC-
DC converter is ideal for use in applications such as PC
cards, CPU daughter cards, and desktop computer
bus-termination boards. The device features internal
synchronous rectification for high efficiency and
reduced component count. It requires no external
Schottky diode. The internal 0.10Ω PMOS power switch
and 0.10Ω NMOS synchronous-rectifier switch easily
deliver continuous load currents up to 2A. The
MAX1644 produces a preset +3.3V or +2.5V output
voltage or an adjustable output from +1.1V to V
achieves efficiencies as high as 95%.
The MAX1644 uses a unique current-mode, constant-
off-time, PWM control scheme, which includes an Idle
Mode™ to maintain high efficiency during light-load
operation. The programmable constant-off-time archi-
tecture sets switching frequencies up to 350kHz, allow-
ing the user to optimize performance trade-offs
between efficiency, output switching noise, component
size, and cost. The device also features an adjustable
soft-start to limit surge currents during start-up, a 100%
duty cycle mode for low-dropout operation, and a low-
power shutdown mode that disconnects the input from
the output and reduces supply current below 1µA. The
MAX1644 is available in a 16-pin SSOP package.
19-1457; Rev 3; 8/05
Idle Mode is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
+3V TO
INPUT
+5V to +3.3V/+2.5V Conversion
CPU I/O Supply
+3.3V PC Card and CardBus Applications
Notebook and Subnotebook Computers
Desktop Bus-Termination Boards
CPU Daughter Card Supply
+5.5V
Synchronous Rectification and Internal Switches
R
TOFF
Typical Operating Circuit
________________________________________________________________ Maxim Integrated Products
2A, Low-Voltage, Step-Down Regulator with
IN
V
FBSEL
SHDN
COMP
TOFF
CC
General Description
MAX1644
PGND
GND
REF
FB
SS
LX
Applications
OUTPUT
+1.1V TO
V
IN
IN
. It
♦ ±1% Output Accuracy
♦ 95% Efficiency
♦ Internal PMOS and NMOS Switches
♦ Output Voltage
♦ +3V to +5.5V Input Voltage Range
♦ 360µA (max) Operating Supply Current
♦ < 1µA Shutdown Supply Current
♦ Programmable Constant-Off-Time Operation
♦ 350kHz (max) Switching Frequency
♦ Idle Mode Operation at Light Loads
♦ Thermal Shutdown
♦ Adjustable Soft-Start Inrush Current Limiting
♦ 100% Duty Cycle During Low-Dropout Operation
♦ Output Short-Circuit Protection
♦ 16-Pin SSOP Package
+Denotes lead-free package.
MAX1644EAE
MAX1644EAE+
70mΩ On-Resistance at V
100mΩ On-Resistance at V
+3.3V or +2.5V Pin-Selectable
+1.1V to V
PART
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
TOP VIEW
IN
COMP
SHDN
TOFF
Adjustable
LX
SS
FB
IN
IN
40°C to +85°C
40°C to +85°C
TEMP RANGE
1
2
3
4
5
6
7
8
Ordering Information
MAX1644
SSOP
Pin Configuration
IN
IN
= +4.5V
= +3V
16
15
14
13
12
11
10
9
LX
PGND
LX
PGND
V
FBSEL
REF
GND
CC
PIN-PACKAGE
16 SSOP
16 SSOP
Features
1
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