LM5642MH/NOPB
Active4.5-36V, CURRENT MODE DUAL SYNCHRONOUS BUCK CONTROLLER WITH OSCILLATOR SYNCHRONIZATION
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LM5642MH/NOPB
Active4.5-36V, CURRENT MODE DUAL SYNCHRONOUS BUCK CONTROLLER WITH OSCILLATOR SYNCHRONIZATION
Technical Specifications
Parameters and characteristics for this part
| Specification | LM5642MH/NOPB |
|---|---|
| Clock Sync | True |
| Control Features | Current Limit, Soft Start, Enable |
| Duty Cycle (Max) [Max] | 98.9 % |
| Frequency - Switching | 200 kHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 2 |
| Operating Temperature [Max] | 125 ¯C |
| Operating Temperature [Min] | -40 °C |
| Output Configuration | Positive |
| Output Phases | 2 |
| Output Type | Transistor Driver |
| Package / Case | 28-PowerTSSOP |
| Package / Case [custom] | 4.4 mm |
| Package / Case [custom] | 0.173 " |
| Supplier Device Package | 28-HTSSOP |
| Synchronous Rectifier | True |
| Topology | Buck |
| Voltage - Supply (Vcc/Vdd) [Max] | 36 V |
| Voltage - Supply (Vcc/Vdd) [Min] | 4.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Tube | 1 | $ 5.44 | |
| 10 | $ 4.89 | |||
| 48 | $ 4.62 | |||
| 144 | $ 4.00 | |||
| 288 | $ 3.80 | |||
| 528 | $ 3.41 | |||
| 1008 | $ 2.87 | |||
| 2544 | $ 2.73 | |||
| Texas Instruments | TUBE | 1 | $ 3.74 | |
| 100 | $ 3.05 | |||
| 250 | $ 2.40 | |||
| 1000 | $ 2.03 | |||
Description
General part information
LM5642 Series
The LM5642 series consists of two current mode synchronous buck regulator controllers operating 180° out of phase with each other at a normal switching frequency of 200kHz for the LM5642 and at 375kHz for the LM5642X.
Out of phase operation reduces the input RMS ripple current, thereby significantly reducing the required input capacitance. The switching frequency can be synchronized to an external clock between 150 kHz and 250 kHz for the LM5642 and between 200 kHz and 500 kHz for the LM5642X. The two switching regulator outputs can also be paralleled to operate as a dual-phase, single output regulator.
The output of each channel can be independently adjusted from 1.3V to 90% of Vin. An internal 5V rail is also available externally for driving bootstrap circuitry.
Documents
Technical documentation and resources
