L4963W Step-Down Switching Regulator Adjustable 5.1V to 36V 1.5A DIP-18
The L4963W is a monolithic power switching regulator designed to deliver a constant 1.5A output current. It operates in a discontinuous variable frequency mode, providing a highly efficient solution for step-down voltage regulation. The device features a standard 5.1V output that can be adjusted up to 36V with minimal external components. It is specifically engineered to support microprocessor systems by including integrated reset and power-fail monitoring circuits.
Features
- High Output Capability: Delivers up to 1.5A of load current.
- Wide Adjustable Range: Output voltage is adjustable from 5.1V to 36V.
- Microprocessor Support: Built-in Reset and Power Fail outputs for system monitoring.
- High Efficiency: Designed for very high efficiency operation.
- Simplified Design: Requires very few external components and no frequency compensation.
- System Protection: Includes internal current limiting and thermal shutdown protection.
- Remote Control: Features a TTL-level remote inhibit input for electronic on/off control.
- Precision Reference: Precise (+/-2%) on-chip voltage reference.
PIN Configuration
Specifications
| Parameter | Conditions / Details | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Range (Vi) | Vo = Vref to 36V, Io = 0.5A | 9 | – | 46 | V |
| Output Voltage Range (Vo) | Vi = 46V, Io = 0.5A | 5.1 | – | 36 | V |
| Output Load Current (Io) | Vi = 9V to 46V, Vo = Vref | 1.5 | – | – | A |
| Feedback Voltage (V12) | Vi = 9V to 46V, Io = 0.5A | 5.0 | 5.1 | 5.2 | V |
| Line Regulation (ΔVo) | Vi = 9V to 46V, Vo = Vref, Io = 0.5A | – | 15 | 50 | mV |
| Load Regulation (ΔVo) | Vo = Vref, Io = 0.5A to 1.5A | – | 15 | 45 | mV |
| Current Limiting (I2L) | Vi = 9V to 46V, Vo = Vref to 28V | 3.5 | – | 6.5 | A |
| Supply Voltage Ripple Rejection (SVR) | Vi = 2Vrms, ripple = 100Hz | 50 | 56 | – | dB |
| Efficiency (η) | Io = 1.5A, Vo = Vref | 65 | 75 | – | % |
| Oscillator Frequency (f) | Rt = 51KΩ | 46 | 60 | 79 | kHz |
| Quiescent Drain Current (Iq) | Vi = 46V, Io = 0mA | – | 14 | 20 | mA |
| Thermal Shutdown (Tsd) | Junction Temperature | 145 | 150 | – | °C |
| Inhibit Low Input Voltage (V16L) | Vi = 9V to 46V | 0.3 | – | 0.8 | V |
| Inhibit High Input Voltage (V16H) | Vi = 9V to 46V | 2.0 | – | 5.5 | V |
Applications
- Microprocessor Power Supplies
- Step-Down (Buck) Regulators
- Remote Power Management
- Industrial Electronics
Package Content
- 1 x L4963W Step-Down Switching Regulator Adjustable 5.1V to 36V 1.5A DIP-18