1 Features
1• LM26003-Q1 is an Automotive-Grade Product
That is AEC-Q100 Grade 1 Qualified (–40°C to
+125°C Operating Junction Temperature)
• High-Efficiency Sleep Mode
• 40-μA Typical Iq in Sleep Mode
• 10.8-μA Typical Iq in Shutdown Mode
• 3.0-V Minimum Input Voltage
• 4.0-V to 38-V Continuous Input Range
• 1.5% Reference Accuracy
• Cycle-by-Cycle Current Limit
• Adjustable Frequency (150 kHz to 500 kHz)
• Synchronizable to an External Clock
• Power Good Flag
• Forced PWM Function
• Adjustable Soft-Start
• 20-Pin HTSSOP Package
• Thermal Shut Down

2 Applications
• Automotive Telematics
• Navigation Systems
• In-Dash Instrumentation
• Battery-Powered Applications
• Standby Power for Home Gateways and Set-Top
Boxes

3 Description
The LM26003 is a switching regulator designed for
the high-efficiency requirements of applications with
standby modes. The device features a low-current sleep mode to maintain efficiency under light-load
conditions and current-mode control for accurate
regulation over a wide input voltage range. Quiescent
current is reduced to 10.8 μA typically in shutdown
mode and less than 40 μA in sleep mode. Forced
PWM mode is also available to disable sleep mode.
The LM26003 device can deliver up to 3 A of
continuous load current with a fixed current limit,
through the internal N-channel switch. The part has a
wide input voltage range of 4.0 V to 38 V and can
operate with input voltages as low as 3 V during line transients.
Operating frequency is adjustable from 150 kHz to 500 kHz with a single resistor and can be
synchronized to an external clock.
Other features include Power Good, adjustable soft-
start, enable pin, input undervoltage protection, and
an internal bootstrap diode for reduced component
count.