datasheet4u.com

900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1644 Datasheet

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

No Preview Available !

MAX1644 pdf
19-1457; Rev 3; 8/05
omEVAALVUAAILTAIOBNLEKIT
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1644 Datasheet

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

No Preview Available !

MAX1644 pdf
2A, Low-Voltage, Step-Down Regulator with
Synchronous Rectification and Internal Switches
ABSOLUTE MAXIMUM RATINGS
VCC, IN to GND ........................................................-0.3V to +6V
IN to VCC.............................................................................±0.3V
GND to PGND.....................................................................±0.3V
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
LX Current (Note 1)...........................................................±3.75A
REF Short Circuit to GND Duration ............................Continuous
ESD Protection .....................................................................±2kV
Continuous Power Dissipation (TA = +70°C)
SSOP (derate 16.7mW/°C above +70°C;
part mounted on 1 in.2 of 1oz. copper) ............................1.2W
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) ................................ +300°C
Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation limits.
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 = VCC = +3.3V, FBSEL = GND, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
VIN, VCC
3.0 5.5 V
Preset Output Voltage
VOUT
ILOAD = 0 to
2A,
VFB = VOUT
VIN = VCC = 4V to 5.5V,
FBSEL = unconnected
VIN = VCC = 3V to 5.5V,
FBSEL = VCC
VIN = VCC = 3V to 5.5V,
FBSEL = REF
3.300 3.333 3.366
2.500 2.525 2.550
1.089 1.100 1.111
V
Adjustable Output Voltage
Range
AC Load Regulation Error
DC Load Regulation Error
Dropout Voltage
Reference Voltage
Reference Load Regulation
PMOS Switch
On-Resistance
NMOS Switch
On-Resistance
Current-Limit Threshold
RMS LX Output Current
VDO
VREF
ΔVREF
RON, P
RON, N
ILIMIT
VIN = VCC = 3V to 5.5V,
ILOAD = 0, FBSEL = GND or REF
FBSEL = GND
FBSEL = REF, VCC, or unconnected
FBSEL = GND
FBSEL = REF, VCC, or unconnected
VIN = VCC = 3V, ILOAD = 1A, FBSEL = VCC
IREF = -1µA to +10µA
ILX = 0.5A
VIN = 4.5V
VIN = 3V
ILX = 0.5A
VIN = 4.5V
VIN = 3V
VREF
1.089
2.5
1
2
0.2
0.4
1.100
0.5
70
100
70
100
2.9
VIN
200
1.111
1
150
200
150
200
3.3
2.5
V
%
%
mV
V
mV
mΩ
mΩ
A
A
Idle Mode Current
Threshold
IIM
0.25 0.45 0.65
A
Switching Frequency
No-Load Supply Current
Shutdown Supply Current
PMOS Switch Off-Leakage
Current
f
IIN + ICC
ICC(SHDN)
IIN
(Note 2)
VFB = 1.2V
SHDN = GND
SHDN = GND
350 kHz
240 360 µA
<1 3 µA
15 µA
Thermal Shutdown
Threshold
TSHDN Hysteresis = 15°C
150 °C
2 _______________________________________________________________________________________


Part Number MAX1644
Description Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting
Maker Maxim
Total Page 11 Pages
PDF Download
MAX1644 pdf
MAX1644 Datasheet PDF
[partsNo] view html
View PDF for Mobile








Similar Datasheet

1 MAX164 (MAX163 - MAX167) CMOS 12-Bit A/D Converters Maxim Integrated Products
Maxim Integrated Products
MAX164 pdf
2 MAX1640 Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier Maxim
Maxim
MAX1640 pdf
3 MAX1641 Adjustable-Output / Switch-Mode Current Sources with Synchronous Rectifier Maxim
Maxim
MAX1641 pdf
4 MAX1642 High-Efficiency / Step-Up DC-DC Converters for 1V Inputs Maxim
Maxim
MAX1642 pdf
5 MAX1643 Step-Up DC-DC Converters Maxim
Maxim
MAX1643 pdf
6 MAX1644 Advanced Chemistry-Independent / Level 2 Battery Charger with Input Current Limiting Maxim
Maxim
MAX1644 pdf
7 MAX1645 Level 2 Battery Chargers Maxim
Maxim
MAX1645 pdf
8 MAX1645A Level 2 Battery Chargers Maxim Integrated
Maxim Integrated
MAX1645A pdf
9 MAX1647 Chemistry-Independent Battery Chargers Maxim
Maxim
MAX1647 pdf





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy