LM1770UMF/NOPB
ActiveLOW-VOLTAGE SOT23 SYNCHRONOUS BUCK CONTROLLER WITH NO EXTERNAL COMPENSATION
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LM1770UMF/NOPB
ActiveLOW-VOLTAGE SOT23 SYNCHRONOUS BUCK CONTROLLER WITH NO EXTERNAL COMPENSATION
Technical Specifications
Parameters and characteristics for this part
| Specification | LM1770UMF/NOPB |
|---|---|
| Clock Sync | False |
| Frequency - Switching [Max] | 1 MHz |
| Frequency - Switching [Min] | 100 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 1 |
| Output Type | Transistor Driver |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 5.5 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 2.8 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tape & Reel (TR) | 1000 | $ 1.19 | |
| 2000 | $ 1.11 | |||
| 5000 | $ 1.07 | |||
| Texas Instruments | SMALL T&R | 1 | $ 1.82 | |
| 100 | $ 1.51 | |||
| 250 | $ 1.08 | |||
| 1000 | $ 0.81 | |||
Description
General part information
LM1770 Series
The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.
Three versions of the LM1770 are available depending on the switching frequency desired for the application. Nominal switching frequencies are in the range of 100kHz to 1000kHz.
The LM1770 is an efficient synchronous buck switching controller in a tiny SOT-23 package. The constant on-time control scheme provides a simple design free of compensation components, allowing minimal component count and board space. It also incorporates a unique input feed-forward to maintain a constant frequency independent of the input voltage. The LM1770 is optimized for a low voltage input range of 2.8V to 5.5V and can provide an adjustable output as low as 0.8V. Driving an external high side PFET and low side NFET it can provide efficiencies as high as 95%.
Documents
Technical documentation and resources
