LTC3872 - No RSENSE Current Mode Boost DC/DC Controller
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.
Features
Typical Application  | Applications
Packaging  |
| Part Number | Package | Temp | Price(1-99) | Price (1k)* |
|---|---|---|---|---|
| LTC3872EDDB#PBF | 3x2 DFN-8 | E | $2.57 | |
| LTC3872EDDB#TRMPBF | 3x2 DFN-8 | E | $2.57 | $1.85 |
| LTC3872EDDB#TRPBF | 3x2 DFN-8 | E | $2.57 | $1.80 |
| LTC3872ETS8#PBF | SOT-23 | E | $2.57 | |
| LTC3872ETS8#TRMPBF | SOT-23 | E | $2.57 | $1.85 |
| LTC3872ETS8#TRPBF | SOT-23 | E | $2.57 | $1.80 |
| LTC3872HDDB#PBF | 3x2 DFN-8 | H | $3.36 | |
| LTC3872HDDB#TRMPBF | 3x2 DFN-8 | H | $3.36 | $2.40 |
| LTC3872HDDB#TRPBF | 3x2 DFN-8 | H | $3.36 | $2.35 |
| LTC3872HTS8#PBF | SOT-23 | H | $3.36 | |
| LTC3872HTS8#TRMPBF | SOT-23 | H | $3.36 | $2.40 |
| LTC3872HTS8#TRPBF | SOT-23 | H | $3.36 | $2.35 |
| LTC3872IDDB#PBF | 3x2 DFN-8 | I | $2.96 | |
| LTC3872IDDB#TRMPBF | 3x2 DFN-8 | I | $2.96 | $2.12 |
| LTC3872IDDB#TRPBF | 3x2 DFN-8 | I | $2.96 | $2.07 |
| LTC3872ITS8#PBF | SOT-23 | I | $2.96 | |
| LTC3872ITS8#TRMPBF | SOT-23 | I | $2.96 | $2.12 |
| LTC3872ITS8#TRPBF | SOT-23 | I | $2.96 | $2.07 |
Demo Boards
| Part Number | Description | Price |
|---|---|---|
| DC989B-A | LTC3872ETS8 Demo Board | 2.75V ≤ VIN ≤ 4.5V; VOUT: 5V @ 2A | $75.00 |
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- LTC3872 Footprints and Symbols
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