1 Features
1• Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results:
– Device Temperature Grade 2: –40°C to
+125°C Ambient Operating Temperature
• 27-μA Quiescent Current in Regulation
• 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 Soft-Start Time by External Capacitor
• Output Voltage Tracking Capability
• Precision Enable to Program System UVLO
• Output Short-Circuit Protection with Hiccup Mode
• Overtemperature Thermal Shutdown Protection
• Create a Custom Design Using the LM43602-Q1
With the WEBENCH® Power Designer

2 Applications
• Sub-AM Band Automotive
• Industrial Power Supplies
• General Purpose Wide VIN Regulation
• High Efficiency Point-Of-Load Regulation
• Telecommunications Systems

3 Description
The LM43602-Q1 regulator is an easy-to-use
synchronous step-down DC-DC converter capable of
driving up to 2 A of load current from an input voltage
ranging from 3.5 V to 36 V (42 V abs maximum). The
LM43602-Q1 provides exceptional efficiency, output
accuracy and dropout voltage in a very small solution
size. An extended family is available in 0.5-A , 1-A,
and 3-A load current options in pin-to-pin compatible
packages. Peak current mode control is employed to
achieve simple control loop compensation and cycleby-
cycle current limiting. Optional features such as
programmable switching frequency, synchronization,
power-good flag, precision enable, internal soft-start,
extendable soft-start, and tracking provide a flexible
and easy to use platform for a wide range of
applications. Discontinuous conduction and automatic
frequency modulation at light loads improve light load
efficiency. The family requires few external
components and pin arrangement allows simple,
optimum PCB layout. Protection features include
thermal shutdown, VCC undervoltage lockout, cycleby-
cycle current limit, and output short-circuit
protection. The LM43602-Q1 device is available in
the HTSSOP (PWP) 16-pin leaded package (6.6 mm
× 5.1 mm × 1.2 mm).The LM43602A-Q1 version is
optimized for PFM operation and recommended for
new designs. The device is pin-to-pin compatible with
LM4360x and LM4600x family.