LM3477AMM/NOPB
ActiveHIGH EFFICIENCY HIGH-SIDE N-CHANNEL CONTROLLER FOR SWITCHING REGULATOR
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LM3477AMM/NOPB
ActiveHIGH EFFICIENCY HIGH-SIDE N-CHANNEL CONTROLLER FOR SWITCHING REGULATOR
Technical Specifications
Parameters and characteristics for this part
| Specification | LM3477AMM/NOPB |
|---|---|
| Clock Sync | False |
| Control Features | Enable |
| Duty Cycle (Max) [Max] | 93 % |
| Frequency - Switching | 500 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 | 8-MSOP, 8-TSSOP |
| Package / Case | 3 mm |
| Package / Case [custom] | 0.118 in |
| Synchronous Rectifier | False |
| Topology | Buck-Boost, Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 35 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 2.97 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 2.94 | |
| 10 | $ 2.64 | |||
| 25 | $ 2.49 | |||
| 100 | $ 2.13 | |||
| 250 | $ 2.00 | |||
| 500 | $ 1.75 | |||
| Digi-Reel® | 1 | $ 2.94 | ||
| 10 | $ 2.64 | |||
| 25 | $ 2.49 | |||
| 100 | $ 2.13 | |||
| 250 | $ 2.00 | |||
| 500 | $ 1.75 | |||
| Tape & Reel (TR) | 1000 | $ 1.45 | ||
| 2000 | $ 1.35 | |||
| 5000 | $ 1.30 | |||
| Texas Instruments | SMALL T&R | 1 | $ 2.21 | |
| 100 | $ 1.83 | |||
| 250 | $ 1.31 | |||
| 1000 | $ 0.99 | |||
Description
General part information
LM3477 Series
The LM3477/A is a high-side N-channel MOSFET switching regulator controller. It can be used in topologies requiring a high side MOSFET such as buck, inverting (buck-boost) and zeta regulators. The LM3477/A's internal push pull driver allows compatibility with a wide range of MOSFETs. This, the wide input voltage range, use of discrete power components and adjustable current limit allows the LM3477/A to be optimized for a wide variety of applications.
The LM3477/A uses a high switching frequency of 500kHz to reduce the overall solution size. Current-mode control requires only a single resistor and capacitor for frequency compensation. The current mode architecture also yields superior line and load regulation and cycle-by-cycle current limiting. A 5µA shutdown state can be used for power savings and for power supply sequencing. Other features include internal soft-start and output over voltage protection. The internal soft-start reduces inrush current. Over voltage protection is a safety feature to ensure that the output voltage stays within regulation.
The LM3477A is similar to the LM3477. The primary difference between the two is the point at which the device transitions into hysteretic mode. The hysteretic threshold of the LM3477A is one-third of the LM3477.
Documents
Technical documentation and resources
