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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM53602, LM53603

SNVSAR0 – NOVEMBER 2016

Converters

1

1 Features

1

•

3-A or 2-A Maximum Load Current

•

Input Voltage Range From 3.5 V to 36 V:

Transients to 42 V

•

Adjustable Output Voltage From 3.3 V to 10 V

•

2.1-MHz Fixed Switching Frequency

•

±2% Output Voltage Tolerance

•

–40°C to 150°C Junction Temperature Range

•

1.7-µA Shutdown Current (Typical)

•

24-µA Input Supply Current at No Load (Typical)

•

Reset Output With Filter and Delay

•

Automatic Light Load Mode for Improved

Efficiency

•

User-Selectable Forced PWM Mode (FPWM)

•

Built-In Loop Compensation, Soft-Start, Current

Limit, Thermal Shutdown, UVLO, and External

Frequency Synchronization

•

Thermally Enhanced 16-Lead Package:

5 mm × 4.4 mm × 1 mm

2 Applications

•

Industrial Power Supplies in Building and Factory

Automation

•

Battery Operated Devices

•

Low-noise and Low-EMI Applications

•

Optical Communication Systems

3 Description

The LM53603 and LM53602 buck regulators are

specifically

designed

for

12-V

industrial

and

automotive

applications,

providing

an

adjustable

output voltage from 3.3 V to 10 V at 3 A or 2 A, from

an input voltage of up to 36 V. Advanced high-speed

circuitry allows the device to regulate from an input of

up to 20 V, while providing an output of 5 V at a

switching frequency of 2.1 MHz. The innovative

architecture allows the device to regulate a 3.3-V

output from an input voltage of only 3.5 V. All aspects

of this product are optimized for the industrial and

automotive customer. An input voltage range up to 36

V, with transient tolerance up to 42 V, eases input

surge protection design. An open-drain reset output,

with filtering and delay, provides a true indication of

system status. This feature negates the requirement

for an additional supervisory component, saving cost

and board space. Seamless transition between PWM

and PFM modes, along with a no-load operating

current of only 24 µA, ensures high efficiency and

superior transient response at all loads.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM53603

LM53602

HTSSOP (16)

5.00 mm x 4.40 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Schematic

Industrial Power Supply With 5-V, 3-A Output