Datasheet Analog Devices LTC3446EDE#PBF — 数据表

LTC3446
Monolithic Buck Regulator
with Dual VLDO Regulators
Features Description High Efficiency Triple Step-Down Outputs from a
Single Input Supply
n 1A Synchronous Buck Regulator Provides Main
Step-Down Output and Powers Two 300mA VLDO™
Linear Regulators
n Output Voltages as Low as 400mV (VLDO Outputs)
n Power Good Output
n Input Voltage Range: 2.7V to 5.5V
n Independent Enable Pin for Each Supply
n Low (140µA Typ) No-Load Quiescent Current with
All Outputs Enabled
n Constant Frequency Current Mode Operatio 2.25MHz Switching Frequency Uses Small Inductors
n Defeatable Automatic Burst Mode® Operation for
High Efficiency at Light Loads
n ±1.5% Reference Accuracy
n Overtemperature Protectio Thermally Enhanced 4mm × 3mm 14-Pin DFN
Package The LTC®3446 combines a synchronous buck DC/DC converter with two very low dropout (VLDO) linear regulators
to provide up to three stepped-down output voltages from
a single input voltage. The input voltage range is ideally
suited for Li-Ion battery-powered applications, as well …