GENERAL DESCRIPTION
The ADP5040 combines one high performance buck regulator and two low dropout regulators (LDO) in a small 20-lead LFCSP to meet demanding performance and board space requirements.
The high switching frequency of the buck regulator enables the use of tiny multilayer external components and minimizes board space.

FEATURES
   Input voltage range: 2.3 V to 5.5 V
   One 1.2 A buck regulator
   Two 300 mA LDOs
   20-lead, 4 mm × 4 mm LFCSP package
   Overcurrent and thermal protection
   Soft start
   Undervoltage lockout
   Buck key specifications
      Output voltage range: 0.8 V to 3.8 V
      Current mode topology for excellent transient response
      3 MHz operating frequency
      Peak efficiency up to 96%
      Uses tiny multilayer inductors and capacitors
      Mode pin selects forced PWM or auto PWM/PSM modes
      100% duty cycle low dropout mode
   LDOs key specifications
      Output voltage range: 0.8 V to 5.2 V
      Low VIN from 1.7 V to 5.5 V
      Stable with 2.2 μF ceramic output capacitors
      High PSRR
      Low output noise
      Low dropout voltage
      −40°C to +125°C junction temperature range