Overview
The LM43601PWPR from Texas Instruments is a 3.5-V to 36-V, 1-A synchronous step-down DC-DC converter. This device is designed to operate with high efficiency and thermal performance, making it suitable for a variety of applications. It features a small solution size and is available in a 16-leaded HTSSOP (PWP) package. The LM43601 employs peak-current-mode control with discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads to achieve high efficiency across the load range. It is internally compensated, reducing the need for external components and simplifying the design process.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN) | 3.5 | 36 | V | |
| Output Current (IOUT) | 1 | A | ||
| Switching Frequency | 200 kHz | 500 kHz | 2.2 MHz | |
| Quiescent Current | 33 µA | |||
| High-Side MOSFET ON-Resistance | 419 mΩ | |||
| Low-Side MOSFET ON-Resistance | 231 mΩ | |||
| Thermal Shutdown Threshold | 160 °C | |||
| Package Type | HTSSOP (16) | |||
| Package Dimensions | 6.6 mm × 5.1 mm × 1.2 mm |
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 ceramic, polymer, tantalum, and aluminum capacitors
- Power-good flag
- Soft start into 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 LM43601PWPR?
The input voltage range is from 3.5 V to 36 V, with a transient voltage up to 42 V.
- What is the maximum output current of the LM43601PWPR?
The maximum output current is 1 A.
- What are the switching frequency options for the LM43601PWPR?
The switching frequency can be adjusted from 200 kHz to 2.2 MHz, with a default frequency of 500 kHz.
- Does the LM43601PWPR have built-in EMI compliance?
Yes, it meets EN55022/CISPR 22 EMI standards.
- What type of package is the LM43601PWPR available in?
The device is available in a 16-leaded HTSSOP (PWP) package.
- What are the key protection features of the LM43601PWPR?
The device includes overtemperature thermal shutdown, output short-circuit protection with hiccup mode, and precision enable to program system UVLO.
- Can the soft-start time of the LM43601PWPR be extended?
Yes, the soft-start time can be extended by connecting an external capacitor to the SS/TRK pin.
- Is the LM43601PWPR internally compensated?
Yes, the device is internally compensated, reducing the need for external components.
- What types of capacitors are compatible with the LM43601PWPR?
The device is stable with ceramic, polymer, tantalum, and aluminum capacitors.
- Does the LM43601PWPR have a power-good flag feature?
Yes, it includes a power-good flag feature.
