Overview
The LM73606RNPT, produced by Texas Instruments, is a high-performance synchronous step-down DC/DC converter. It is part of the LM73605 and LM73606 family, designed to operate from a supply voltage ranging from 3.5 V to 36 V. This device is capable of delivering up to 6 A of DC load current, offering exceptional efficiency and thermal performance in a compact solution size. The LM73606 employs fixed-frequency peak current-mode control and can operate in either auto mode or forced PWM mode, allowing for high efficiency at light loads and constant switching frequency over the entire load range.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage (PVIN to PGND) | -0.3 | 42 | V | |
| Output Current | 6 | A | ||
| Switching Frequency | 350 kHz | 2.2 MHz | ||
| Quiescent Current (Shutdown) | 0.8 µA | |||
| Junction-to-Ambient Thermal Resistance (RθJA) | 34.3 | °C/W | ||
| High-Side Current Limit | 7.4 | 8.7 | 9.85 | A |
| Low-Side Current Limit | 5.8 | 6.6 | 7.25 | A |
| Soft-Start Time | 3.5 ms | 6.3 ms |
Key Features
- Synchronous rectification for high efficiency
- Wettable flanks QFN package (WQFN) for enhanced thermal and EMI performance
- Low quiescent current of 0.8 µA in shutdown mode
- Adjustable switching frequency from 350 kHz to 2.2 MHz and synchronization to an external clock
- Power-good flag, precision enable, internal or adjustable soft start, and output voltage tracking
- Protection features including thermal shutdown, undervoltage lockout (UVLO), cycle-by-cycle current limiting, and short-circuit hiccup protection
- Automatic frequency foldback at light loads to improve efficiency
- Configurable auto or forced PWM operation mode for high efficiency at light loads or constant switching frequency
Applications
- Industrial distributed power applications
- Test and measurement equipment
- General-purpose wide VIN applications
Q & A
- What is the input voltage range of the LM73606?
The input voltage range is from 3.5 V to 36 V.
- How much output current can the LM73606 deliver?
The LM73606 can deliver up to 6 A of DC load current.
- What are the operating modes of the LM73606?
The device can operate in either auto mode or forced PWM mode.
- What is the quiescent current in shutdown mode?
The quiescent current in shutdown mode is typically 0.8 µA.
- Can the switching frequency be adjusted?
Yes, the switching frequency can be adjusted from 350 kHz to 2.2 MHz and can also be synchronized to an external clock.
- What protection features does the LM73606 have?
The device includes thermal shutdown, undervoltage lockout (UVLO), cycle-by-cycle current limiting, and short-circuit hiccup protection.
- How does the automatic frequency foldback feature work?
The automatic frequency foldback feature reduces the switching frequency at light loads to improve efficiency.
- What is the purpose of the power-good flag?
The power-good flag indicates when the output voltage is within the specified range.
- Can the soft-start time be adjusted?
Yes, the soft-start time can be adjusted using the SS/TRK pin.
- What is the thermal resistance of the WQFN package?
The junction-to-ambient thermal resistance (RθJA) is 34.3 °C/W.
