AS1334 Step-Down Converter IC

Description

The AS1334 is a step-down DC-DC converter designed to power portable applications from a single Li-Ion battery. The device also achieves high-performance in mobile phones and other applications requiring low dropout voltage.

The AS1334 operates from an input voltage range of 2.7V to 5.5V while providing output voltages of 1.2, 1.5, 1.8, 2.5, 3.0 and 3.3V.

Fixed-frequency PWM operation minimizes RF interference. Shutdown function turns the device off and reduces battery consumption to 0.01μA (typ).

The AS1334 is available in a TDFN(3x3) 8-pin package. A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.

Key Features

• Output Voltage Ripple: 2mV
• Input Voltage Range: 3.25 to 5.5V
• Output Voltage Range: 1.2V to 3.4V
• Fixed Output Voltages:
  -1.2V, 1.5V, 1.8V, 2.5V, 3.0V, 3.3V
• Switching Frequency: 2MHz
• Maximum Load Capability of 650mA
• 97% High Efficiency, 94% Average Efficiency
• Current Overload Protection
• Thermal Overload Protection
• Power-OK
• Soft Start
• Low Dropout Voltage (140 mΩ Typ PFET)
• TDFN(3x3) 8-pin

Applications

The AS1334 is an ideal solution to supply noise sensitive applications as cellular phones, hand-held radios, RF PC cards, battery powered RF devices, RFID chipsets, A/D Converter, Sensors and OpAmps.

Block Diagram