Overview
The LM43602PWPR from Texas Instruments is a high-efficiency synchronous step-down DC-DC converter. It operates from an input voltage range of 3.5 V to 36 V and can deliver up to 2 A of load current. This regulator is designed for exceptional efficiency, output accuracy, and thermal performance in a compact solution size. The LM43602 is part of an extended family that includes options for 0.5 A, 1 A, and 3 A load currents in pin-to-pin compatible packages.
The device employs fixed frequency 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 design time and the need for external components. The switching frequency is programmable from 200 kHz to 2.2 MHz and can be synchronized to an external clock within this range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (VIN to PGND) | -0.3 | 42 | V | |
| Output Current | 2 | A | ||
| Switching Frequency (Default) | 425 | 500 | 580 | kHz |
| Adjustable Frequency Range | 200 | 2200 | kHz | |
| Quiescent Current in Regulation | 27 | µA | ||
| Junction-to-Ambient Thermal Resistance (HTSSOP) | 38.9 | °C/W | ||
| Junction-to-Ambient Thermal Resistance (VSON) | 31.3 | °C/W | ||
| Operating Junction Temperature Range | -40 | 125 | °C |
Key Features
- High Efficiency at Light Load (DCM and PFM)
- Meets EN55022/CISPR 22 EMI standards
- Integrated Synchronous Rectification
- Adjustable Frequency Range: 200 kHz to 2.2 MHz (500 kHz Default)
- Frequency Synchronization to External Clock
- Internal Compensation
- Stable with Almost Any Combination of Ceramic, Polymer, Tantalum, and Aluminum Capacitors
- 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
- General Purpose Wide VIN Regulation
- High Efficiency Point-Of-Load Regulation
Q & A
- What is the input voltage range of the LM43602?
The input voltage range of the LM43602 is from 3.5 V to 36 V.
- What is the maximum output current of the LM43602?
The LM43602 can deliver up to 2 A of load current.
- What are the key efficiency features of the LM43602?
The LM43602 features high efficiency at light loads through Discontinuous Conduction Mode (DCM) and Pulse Frequency Modulation (PFM).
- Does the LM43602 meet any specific EMI standards?
Yes, the LM43602 meets EN55022/CISPR 22 EMI standards.
- What is the default switching frequency of the LM43602?
The default switching frequency is 500 kHz, but it can be adjusted from 200 kHz to 2.2 MHz.
- Can the LM43602 be synchronized to an external clock?
Yes, the LM43602 can be synchronized to an external clock within the 200 kHz to 2.2 MHz frequency range.
- What protection features are included in the LM43602?
The LM43602 includes overtemperature thermal shutdown, VCC undervoltage lockout, cycle-by-cycle current limit, and output short circuit protection with hiccup mode.
- How does the LM43602 handle soft-start?
The LM43602 has an internal soft start of 4.1 ms, which can be extended by an external capacitor.
- What is the quiescent current of the LM43602 in regulation?
The quiescent current in regulation is typically 27 µA.
- In what packages is the LM43602 available?
The LM43602 is available in 16-lead HTSSOP and 16-pin VSON packages.
