1FEATURES

23• Tiny 8-Bump Thin DSBGA Package: 0.84 mm ×

1.615 mm × 0.6 mm

• 2.8 V to 5.5 V Input Voltage Range

• Adjustable Output Voltage: -0.9 V to -5.5 V

• 320 mA Switch Current Limit

• 500 kHz Minimum Switching Frequency

• Ground Referred Enable Input

• Under Voltage Lock Out (UVLO)

• No External Compensation

• Internal Soft Start

• 1 μA Shutdown Supply Current

• Small Output Voltage Ripple

• WEBENCH® Enabled

APPLICATIONS

• General Purpose Negative Voltage Supply

• Negative Rail / Bias Supply For Op-amp And

Data Converters

• LCD Biasing

PERFORMANCE BENEFITS

• Easy To Use

• Tiny Overall Solution Size Reduces System

Cost

DESCRIPTION

The LMR70503 is a buck-boost converter with

adjustable negative output voltage in a tiny 8-bump

thin DSBGA package. Its unique control method is

designed to provide fast transient response, low

output noise, high efficiency, and tight regulation in

the smallest possible PCB area. The LMR70503 has

built in soft start, peak current limit, minimum

switching frequency, and Under Voltage Lock Out

(UVLO), with no external compensation required. For

ease of use, the Enable pin is referred to the IC

ground, instead of the lowest potential of the IC: the

negative output voltage.