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MAX1644 fiches techniques PDF

Maxim Integrated - Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting

Numéro de référence MAX1644
Description Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting
Fabricant Maxim Integrated 
Logo Maxim Integrated 





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MAX1644 fiche technique
19-1457; Rev 3; 8/05
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Synchh2erAoe,nt4LoUou.cws -RVeoclttaifgicea, tSiotenpa-DnodwInnteRrengaul lSawtoirtcwhiethsGeneral Description
SThe MAX1644 constant-off-time, PWM step-down DC-
taDC converter is ideal for use in applications such as PC
acards, CPU daughter cards, and desktop computer
.Dbus-termination boards. The device features internal
synchronous rectification for high efficiency and
wreduced component count. It requires no external
wSchottky diode. The internal 0.10Ω PMOS power switch
wand 0.10Ω NMOS synchronous-rectifier switch easily
deliver continuous load currents up to 2A. The
mMAX1644 produces a preset +3.3V or +2.5V output
voltage or an adjustable output from +1.1V to VIN. It
oachieves efficiencies as high as 95%.
.cThe MAX1644 uses a unique current-mode, constant-
off-time, PWM control scheme, which includes an Idle
Mode™ to maintain high efficiency during light-load
Uoperation. The programmable constant-off-time archi-
tecture sets switching frequencies up to 350kHz, allow-
t4ing the user to optimize performance trade-offs
between efficiency, output switching noise, component
size, and cost. The device also features an adjustable
esoft-start to limit surge currents during start-up, a 100%
duty cycle mode for low-dropout operation, and a low-
epower shutdown mode that disconnects the input from
the output and reduces supply current below 1µA. The
hMAX1644 is available in a 16-pin SSOP package.
SApplications
ta+5V to +3.3V/+2.5V Conversion
CPU I/O Supply
a+3.3V PC Card and CardBus Applications
Notebook and Subnotebook Computers
.DDesktop Bus-Termination Boards
CPU Daughter Card Supply
wTypical Operating Circuit
wINPUT
+3V TO
m+5.5V
w Sheet4U.coRTOFF
IN LX
MAX1644 FB
VCC
FBSEL
SHDN
COMP
TOFF
PGND
GND
REF
SS
OUTPUT
+1.1V TO
VIN
Features
±1% Output Accuracy
95% Efficiency
Internal PMOS and NMOS Switches
70mΩ On-Resistance at VIN = +4.5V
100mΩ On-Resistance at VIN = +3V
Output Voltage
+3.3V or +2.5V Pin-Selectable
+1.1V to VIN Adjustable
+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
Ordering Information
PART
TEMP RANGE
MAX1644EAE
40°C to +85°C
MAX1644EAE+
40°C to +85°C
+Denotes lead-free package.
PIN-PACKAGE
16 SSOP
16 SSOP
Pin Configuration
TOP VIEW
SHDN 1
IN 2
LX 3
IN 4
SS 5
COMP 6
TOFF 7
FB 8
MAX1644
SSOP
16 LX
15 PGND
14 LX
13 PGND
12 VCC
11 FBSEL
10 REF
9 GND
ataIdle Mode is a trademark of Maxim Integrated Products, Inc.
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
.D________________________________________________________________ Maxim Integrated Products 1
wwFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
w1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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