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LTC3125 Datasheet(Fiches technique) 1 Page - Linear Technology

Numéro de pièce LTC3125
Description  1.2A Synchronous Step-Up DC/DC Converter with Input Current Limit
Télécharger  16 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
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LTC3125
1
3125f
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
1.2A Synchronous Step-Up
DC/DC Converter with
Input Current Limit
The LTC
®3125 is a high efficiency, synchronous step-up
DC/DC converter with an accurate programmable average
input current limit. The ±5% accurate average input current
is resistor programmable and suitable for a wide variety of
applications. In mobile computing, GSM and GPRS cards
demand high current pulses well beyond the capability
of the PC Card and CompactFlash slots. The LTC3125 in
concert with a reservoir capacitor, keeps the slot power
safely within its capabilities providing a high performance
and simple solution.
Synchronous rectification produces high efficiency while
the 1.6MHz switching frequency minimizes the solution
footprint. The current mode PWM design is internally com-
pensated. Output disconnect allows the load to discharge in
shutdown, while also providing inrush current limiting.
Other features include a <1μA shutdown current, short-
circuit and thermal overload protection. The LTC3125 is of-
fered in a low profile 0.75mm
× 2mm × 3mm package.
PCMCIA/CompactFlash (3.3V/500mA Max),
4V GSM Pulsed Load
n Programmable Average Input Current Limit
n 5% Input Current Accuracy
n 200mA to 1000mA Program Range
n VIN: 1.8V to 5.5V, VOUT: 2V to 5.25V
n Supports High Current GSM/GPRS Load Burst
n VIN > VOUT Operation
n 1.6MHz Fixed Frequency Operation
n Internal Current Sense Resistor
n 1.2A Peak Current Limit
n Up to 93% Efficiency
n Output Disconnect in Shutdown
n Soft-Start
n Low Quiescent Current Burst Mode
® Operation (15μA)
n Available in 2mm
× 3mm × 0.75mm DFN Package
n GSM/GPRS PCMCIA/CompactFlash PC Card Modems
n Wireless Emergency Locators
n Portable Radios
n Supercap Chargers
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
CS
2.2μH
LTC3125
GND
VIN
1.24M
2200μF
2
TANT
10μF
CER
VOUT
4V
2A PULSED LOAD
VIN
3.3V
500mA
536k
3125 TA01a
SHDN
PROG
VOUT
FB
44.2k
SW
OFF ON
Efficiency vs Load Current
LOAD CURRENT (A)
0.001
40
50
60
70
80
0.01
0.1
1
3125 TA01b
30
20
10
0
90
100
0.1
0.01
0.001
1
VOUT = 4V
VIN = 3.3V
VIN = 2.4V




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