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LTC3872

Linear Technology
Part Number LTC3872
Manufacturer Linear Technology
Description Boost DC/DC Controller
Published Jun 8, 2009
Detailed Description LTC3872 No RSENSE Current Mode Boost DC/DC Controller Features n No Current Sense Resistor Required n VOUT up to 60V n ...
Datasheet PDF File LTC3872 PDF File

LTC3872
LTC3872

Overview
LTC3872 No RSENSE Current Mode Boost DC/DC Controller Features n No Current Sense Resistor Required n VOUT up to 60V n Constant Frequency 550kHz Operation n Internal Soft-Start and Optional External Soft-Start n Adjustable Current Limit n Pulse Skipping at Light Load n VIN Range: 2.
75V to 9.
8V n ±1.
5% Voltage Reference Accuracy n Current Mode Operation for Excellent Line and Load Transient Response n Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages Applications n Telecom Power Supplies n 42V Automotive Systems n 24V Industrial Controls n IP Phone Power Supplies Description The LTC®3872 is a constant frequency current mode boost DC/DC controller that drives an N-channel power MOSFET and requires very few external components.
The No RSENSETM architecture eliminates the need for a sense resistor, improves efficiency and saves board space.
The LTC3872 provides excellent AC and DC load and line regulation with ±1.
5% output voltage accuracy.
It incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.
3V.
High switching frequency of 550kHz allows the use of a small inductor.
The LTC3872 is available in an 8-lead low profile (1mm) ThinSOTTM package and 8-pin 2mm × 3mm DFN package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
POWER LOSS (W) Typical Application High Efficiency 3.
3V Input, 5V Output Boost Converter 1.
8nF 17.
4k ITH VIN 47pF VIN IPRG LTC3872 GND SW VFB RUN/SS NGATE 11k 1% 1nF 34.
8k 1% 1µH D1 M1 100µF ×2 VIN 3.
3V 10µF VOUT 5V 2A 3872 TA01 EFFICIENCY (%) Efficiency and Power Loss vs Load Current 100 90 80 70 60 50 40 30 20 10 0 1 10 1 0.
1 0.
01 10 100 1000 LOAD CURRENT (mA) 0.
001 10000 3872 TA01b For more information www.
linear.
com/LTC3872 3872fc 1 LTC3872 Absolute Maximum Ratings (Note 1) Input Su...


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