GENERAL DESCRIPTION
The ADP5034 combines two high performance buck regulators and two low dropout (LDO) regulators in a small, 24-lead 4 mm × 4 mm LFCSP to meet demanding performance and board space requirements. The high switching frequency of the buck regulators enables tiny multilayer external components and minimizes the board space. When the MODE pin is set to high, the buck regulators operate in forced PWM mode. When the MODE pin is set to low, the buck regulators operate in PWM mode when the load is above a predefined threshold. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving the light load efficiency.
The two bucks operate out of phase to reduce the input capacitor requirement. The low quiescent current, low dropout voltage, and wide input voltage range of the ADP5034 LDOs extend the battery life of portable devices. The ADP5034 LDOs maintain power supply rejection greater than 60 dB for frequencies as high as 10 kHz while operating with a low headroom voltage.
Regulators in the ADP5034 are activated through dedicated enable pins. The default output voltages can be externally set in the adjustable version, or factory programmable to a wide range of preset values in the fixed voltage version.

FEATURES
  Main input voltage range: 2.3 V to 5.5 V
  Two 1200 mA buck regulators and two 300 mA LDOs
  24-lead, 4 mm × 4 mm LFCSP package
  Regulator accuracy: ±3%
  Factory programmable or external adjustable VOUTx
  3 MHz buck operation with forced PWM and auto PWM/PSM modes
  BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V
  LDO1/LDO2: output voltage range from 0.8 V to 5.2 V
  LDO1/LDO2: low input supply voltage from 1.7 V to 5.5 V
  LDO1/LDO2: high PSRR and low output noise
 
APPLICATIONS
  Power for processors, ASICS, FPGAs, and RF chipsets
  Portable instrumentation and medical devices
  Space constrained devices