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LT1944-1

Linear
Part Number LT1944-1
Manufacturer Linear
Description Dual Micropower Step-Up DC/DC Converter
Published Mar 31, 2016
Detailed Description U U FEATURES s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode s Operates with VIN as Low as 1.2V s Lo...
Datasheet PDF File LT1944-1 PDF File

LT1944-1
LT1944-1

Overview
U U FEATURES s Low Quiescent Current: 20µA in Active Mode <1µA in Shutdown Mode s Operates with VIN as Low as 1.
2V s Low VCESAT Switches: 85mV at 70mA s Uses Small Surface Mount Components s High Output Voltage: Up to 34V s Tiny 10-Pin MSOP Package U APPLICATIO S s Small TFT LCD Panels s Handheld Computers s Battery Backup s Digital Cameras LT1944-1 Dual Micropower Step-Up DC/DC Converter DESCRIPTIO The LT®1944-1 is a dual micropower step-up DC/DC converter in a 10-pin MSOP package.
One converter is designed with a 100mA current limit and a 400ns off-time; the other with a 175mA current limit and a 1.
5µs off-time.
The 1.
5µs off-time converter is ideal for generating an output voltage that is close to the input voltage (i.
e.
a LiIon to 5V converter, or a two-cell to 3.
3V converter).
With an input voltage range of 1.
2V to 15V, the LT1944-1 is ideal for a wide variety of applications.
Both converters feature a quiescent current of only 20µA at no load, which further reduces to 0.
5µA in shutdown.
A current limited, fixed offtime control scheme conserves operating current, resulting in high efficiency over a broad range of load current.
Tiny, low profile inductors and capacitors can be used to minimize footprint and cost in space-conscious portable applications.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO Triple Output Power Supply (5V, 15V, –10V) for LCD Displays VIN 2.
7V TO 4.
2V C1 4.
7µF L1 22µH D1 8 VIN 4 SHDN2 6 4.
7pF SW2 5 FB2 LT1944-1 2 SHDN1 1 FB1 GND PGND PGND SW1 3 7 9 10 5V 40mA 1M C2 4.
7µF 324k 178k L2 22µH C1, C2: TAIYO YUDEN JMK212BJ475 C3, C4: TAIYO YUDEN EMK212BJ105 C5: TAIYO YUDEN EMK107BJ104 D1, D2, D3, D4: CENTRAL SEMI CMDSH3 L1, L2: MURATA LQH3C220 4.
7pF D2 2M C5 0.
1µF D3 5V D4 C3 1µF 15V 2.
5mA C4 1µF –10V 1944-1 TA01 1mA EFFICIENCY (%) 90 85 80 75 70 65 60 55 50 0.
1 5V Output Efficiency VIN = 4.
2V VIN = 2.
7V 1 10 LOAD CURRENT (mA) 100 1944-1 TA01a 1 U WW W LT1944-1 ABSOLUTE A...


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