LTC3872-1 - No RSENSE Current Mode Boost DC/DC Controller

The LTC®3872-1 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 LTC3872-1 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.

LTC3872-1 has the same functionality as the standard LTC3872 except that it has no frequency foldback in current limit.

High switching frequency of 550kHz allows the use of a small inductor. The LTC3872-1 is available in an 8-lead low profile (1mm) ThinSOTTM package and 8-pin 2mm × 3mm DFN package.

Features

No Current Sense Resistor Required
VOUT up to 60V
Constant Frequency 550kHz Operation
Internal Soft-Start and Optional External Soft-Start
Adjustable Current Limit
Pulse Skipping at Light Load
VIN Range: 2.75V to 9.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Low Profile (1mm) SOT-23 and 2mm × 3mm DFN Packages

Typical Application

Applications

Telecom Power Supplies
42V Automotive Systems
24V Industrial Controls
IP Phone Power Supplies

Packaging

**Order Information**
Part Number	Package	Temp	Price(1-99)	Price (1k)*
LTC3872EDDB-1#PBF	3x2 DFN-8	E	$2.57
LTC3872EDDB-1#TRMPBF	3x2 DFN-8	E	$2.57	$1.85
LTC3872EDDB-1#TRPBF	3x2 DFN-8	E	$2.57	$1.80
LTC3872ETS8-1#PBF	SOT-23	E	$2.57
LTC3872ETS8-1#TRMPBF	SOT-23	E	$2.57	$1.85
LTC3872ETS8-1#TRPBF	SOT-23	E	$2.57	$1.80
LTC3872HDDB-1#PBF	3x2 DFN-8	H	$3.36
LTC3872HDDB-1#TRMPBF	3x2 DFN-8	H	$3.36	$2.40
LTC3872HDDB-1#TRPBF	3x2 DFN-8	H	$3.36	$2.35
LTC3872HTS8-1#PBF	SOT-23	H	$3.36
LTC3872HTS8-1#TRMPBF	SOT-23	H	$3.36	$2.40
LTC3872HTS8-1#TRPBF	SOT-23	H	$3.36	$2.35
LTC3872IDDB-1#PBF	3x2 DFN-8	I	$2.96
LTC3872IDDB-1#TRMPBF	3x2 DFN-8	I	$2.96	$2.12
LTC3872IDDB-1#TRPBF	3x2 DFN-8	I	$2.96	$2.07
LTC3872ITS8-1#PBF	SOT-23	I	$2.96
LTC3872ITS8-1#TRMPBF	SOT-23	I	$2.96	$2.12
LTC3872ITS8-1#TRPBF	SOT-23	I	$2.96	$2.07

Demo Boards


Part Number	Description	Price
DC989B-B	LTC3872-1ETS8 Demo Board \| 2.75V ≤ VIN ≤ 4.5V; VOUT: 5V @ 2A	$75.00