Catalog
High Voltage, 1.5A, 500kHz Step-Down Switching Regulators
| Part | Number of Outputs | Voltage - Output (Max) [Max] | Output Type | Voltage - Input (Max) [Max] | Output Configuration | Supplier Device Package | Topology | Synchronous Rectifier | Voltage - Output (Min/Fixed) | Frequency - Switching | Voltage - Input (Min) [Min] | Current - Output | Package / Case [custom] | Package / Case | Package / Case [custom] | Operating Temperature [Min] | Operating Temperature [Max] | Function | Mounting Type | Package / Case | Package / Case | Output Type |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-TSSOP-EP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 0.173 " | 16-TSSOP Exposed Pad | 4.4 mm | -40 °C | 125 ¯C | Step-Down | Surface Mount | ||||
 Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-SSOP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 16-SSOP | 0 °C | 125 ¯C | Step-Down | Surface Mount | 0.154 in | 3.9 mm | ||||
Analog Devices | 1 | 60 V | Positive | 16-SSOP | Buck | 5 V | 500 kHz | 5.5 V | 1.5 A | 16-SSOP | -40 °C | 125 ¯C | Step-Down | Surface Mount | 0.154 in | 3.9 mm | 1.81 mOhm | |||||
 Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-TSSOP-EP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 0.173 " | 16-TSSOP Exposed Pad | 4.4 mm | 0 °C | 125 ¯C | Step-Down | Surface Mount | ||||
Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-TSSOP-EP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 0.173 " | 16-TSSOP Exposed Pad | 4.4 mm | -40 °C | 125 ¯C | Step-Down | Surface Mount | ||||
Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-SSOP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 16-SSOP | -40 °C | 125 ¯C | Step-Down | Surface Mount | 0.154 in | 3.9 mm | ||||
Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-SSOP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 16-SSOP | -40 °C | 125 ¯C | Step-Down | Surface Mount | 0.154 in | 3.9 mm | ||||
 Analog Devices | 1 | 60 V | Positive | 16-TSSOP-EP | Buck | 5 V | 500 kHz | 5.5 V | 1.5 A | 0.173 " | 16-TSSOP Exposed Pad | 4.4 mm | 0 °C | 125 ¯C | Step-Down | Surface Mount | 1.81 mOhm | |||||
 Analog Devices | 1 | 54 V | Adjustable | 60 V | Positive | 16-SSOP | Buck | 1.219 V | 500 kHz | 5.5 V | 1.5 A | 16-SSOP | 0 °C | 125 ¯C | Step-Down | Surface Mount | 0.154 in | 3.9 mm |
Key Features
• Wide Input Range: 5.5V to 60V
• 1.5A Peak Switch Current
• Small 16-Pin SSOP Package or Thermally Enhanced TSSOP Package
• Saturating Switch Design: 0.2Ω
• Peak Switch Current Maintained Over Full Duty Cycle Range
• Constant 500kHz Switching Frequency
• Effective Supply Current: 2.5mA
• Shutdown Current: 25µA
• 1.2V Feedback Reference (LT1956)
• 5V Fixed Output (LT1956-5)
• Easily Synchronizable
• Cycle-by-Cycle Current Limiting
Description
AI
The LT1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range*. A shutdown pin reduces supply current to 25µA and the device can be externally synchronized from 580kHz to 700kHz with a logic level input.The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages.ApplicationsHigh Voltage, Industrial and AutomotivePortable ComputersBattery-Powered SystemsBattery ChargersDistributed Power Systems