GENERAL DESCRIPTION

The ADP5042 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 use of tiny multilayer external components and minimizes the board space.

 

 

FEATURES

Input voltage range: 2.3 V to 5.5 V
One 0.8 A buck regulator
Two 300 mA LDOs
20-lead, 4 mm × 4 mm LFCSP package
Initial regulator accuracy: ±1%
Overcurrent and thermal protection
Soft start
Undervoltage lockout
Open drain processor reset with threshold monitoring
±1.5% threshold accuracy over the full temperate range
Guaranteed reset output valid to VCC = 1 V
Dual watchdog for secure systems
Watchdog 1 controls reset
Watchdog 2 controls reset and regulators power cycle
Buck key specifications
Current mode topology for excellent transient response
3 MHz operating frequency
Uses tiny multilayer inductors and capacitors
Mode pin selects forced PWM or auto PFM/PSM modes
100% duty cycle low dropout mode
LDOs key specifications
Low VIN from 1.7 V to 5.5 V
Stable with1 μF ceramic output capacitors
High PSRR, 60 dB PSRR up to 1 kHz/10 kHz
Low output noise
110 μV rms typical output noise at VOUT = 2.8 V
Low dropout voltage: 150 mV at 300 mA load
−40°C to +125°C junction temperature range