Overview
The LM43603PWPR is a synchronous step-down DC-DC converter produced by Texas Instruments. This regulator is designed to drive up to 3 A of load current from an input voltage ranging from 3.5 V to 36 V (with an absolute maximum of 42 V). It offers exceptional efficiency, output accuracy, and a small solution size, making it suitable for a wide range of applications. The device is available in HTSSOP and VSON-16 packages, both of which are designed for optimal PCB layout and heat dissipation.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Input Voltage (VIN to PGND) | -0.3 | 42 | V | |
| Output Voltage (VOUT) | 1 | 28 | V | |
| Output Current (IOUT) | 0 | 3 | A | |
| Operating Junction Temperature (TJ) | -40 | 125 | °C | |
| Quiescent Current (IQ-SW) | 27 | µA | ||
| Switching Frequency (FOSC-DEFAULT) | 425 | 500 | 580 | kHz |
| High-Side MOSFET ON-Resistance (RDS-ON-HS) | 120 | mΩ | ||
| Low-Side MOSFET ON-Resistance (RDS-ON-LS) | 65 | mΩ | ||
| Thermal Shutdown Threshold | 160 | °C |
Key Features
- High efficiency at light load (DCM and PFM modes)
- Meets EN55022/CISPR 22 EMI standards
- Integrated synchronous rectification
- Adjustable frequency range: 200 kHz to 2.2 MHz (default 500 kHz)
- Frequency synchronization to external clock
- Internal compensation
- Stable with various types of capacitors (ceramic, polymer, tantalum, aluminum)
- Power-good flag
- Soft start into a pre-biased load
- Internal soft-start: 4.1 ms, extendable by external capacitor
- Output voltage tracking capability
- Precision enable to program system UVLO
- Output short circuit protection with hiccup mode
- Overtemperature thermal shutdown protection
Applications
- Industrial power supplies
- Telecommunications systems
- Sub-AM band automotive systems
- General purpose wide VIN regulation
- High efficiency point-of-load regulation
Q & A
- What is the input voltage range of the LM43603PWPR?
The input voltage range is from 3.5 V to 36 V, with an absolute maximum of 42 V.
- What is the maximum output current of the LM43603PWPR?
The maximum output current is 3 A.
- What are the typical switching frequencies of the LM43603PWPR?
The default switching frequency is 500 kHz, but it can be adjusted from 200 kHz to 2.2 MHz.
- Does the LM43603PWPR meet EMI standards?
Yes, it meets EN55022/CISPR 22 EMI standards.
- What types of capacitors can be used with the LM43603PWPR?
The device is stable with ceramic, polymer, tantalum, and aluminum capacitors.
- What is the thermal shutdown threshold of the LM43603PWPR?
The thermal shutdown threshold is 160°C, with a recovery threshold of 150°C.
- How does the soft-start feature work on the LM43603PWPR?
The device has an internal soft-start time of 4.1 ms, which can be extended by an external capacitor.
- What is the purpose of the power-good flag on the LM43603PWPR?
The power-good flag indicates when the output voltage is within the specified range, tripping at 110% and 88% of the FB voltage.
- How does the output short circuit protection work on the LM43603PWPR?
The device features output short circuit protection with a hiccup mode to prevent damage.
- What are the package options for the LM43603PWPR?
The device is available in HTSSOP and VSON-16 packages.
