LT3640IFE#PBF
ActiveCONV DC-DC 4V TO 35V SYNCHRONOUS STEP DOWN DUAL-OUT 35.12V 1.3A/1.3A 28-PIN TSSOP EP TUBE
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LT3640IFE#PBF
ActiveCONV DC-DC 4V TO 35V SYNCHRONOUS STEP DOWN DUAL-OUT 35.12V 1.3A/1.3A 28-PIN TSSOP EP TUBE
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Technical Specifications
Parameters and characteristics for this part
| Specification | LT3640IFE#PBF |
|---|---|
| Current - Output | 1.1 A, 1.3 A |
| Frequency - Switching [Max] | 2 MHz |
| Frequency - Switching [Min] | 500 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 Type | Adjustable |
| Package / Case | Exposed Pad, 28-TSSOP |
| Package / Case [custom] | 4.4 mm |
| Package / Case [x] | 0.173 in |
| Supplier Device Package | 28-TSSOP-EP |
| Synchronous Rectifier | False |
| Topology | Buck |
| Voltage - Input (Max) [Max] [custom] | 35 V |
| Voltage - Input (Min) [Min] | 2.5 V |
| Voltage - Output (Max) [Max] | 33.97 V |
| Voltage - Output (Min/Fixed) [Max] | 1.265 V |
| Voltage - Output (Min/Fixed) [Min] | 0.6 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
Description
General part information
LT3640 Series
The LT3640 is a dual channel, current mode monolithic buck switching regulator with a power-on reset and a watchdog timer. Both regulators are synchronized to a single oscillator with an adjustable frequency (350kHz to 2.5MHz). At light loads, both regulators operate in low ripple Burst Mode®to maintain high efficiency and low output ripple.The high voltage channel is a nonsynchronous buck with an internal 2.4A top switch that operates from an input of 4V to 35V; a 36.5V OVLO protects the device to 55V. The low voltage channel operates from an input of 2.5V to 5.5V. Internal synchronous power switches provide high efficiency without the need of external Schottky diode. Both channels have cycle-by-cycle current limit, providing protection against shorted outputs.The power-on reset and watchdog timeout periods are both adjustable using external capacitors. The window mode watchdog timer flags when the μP pulses group too close together or too far apart.The LT3640 is available in a 28-pin 4mm × 5mm QFN package and 28-pin TSSOP package. Both packages have an exposed pad for low thermal resistance.ApplicationsIndustrial Power SuppliesAutomotive Electronic Control Units
Documents
Technical documentation and resources