AP3441/L
1MHZ, 3A STEP-DOWN DC-DC BUCK CONVERTER
Description
Pin Assignments
The AP3441 and AP3441L are 3A step-down DC-DC converters. At
heavy load, the constant-frequency PWM control performs excellent
stability and transient response. No external compensation
components are required.
(Top View)
Pin 1 Mark
The AP3441/L supports a range of input voltages from 2.7V to 5.5V
allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH
cell, and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage. The AP3441/L employs
internal power switch and synchronous rectifier to minimize external
part count and realize high efficiency. During shutdown, the input is
disconnected from the output and the shutdown current is less than
1μA. Other key features include over-temperature and short circuit
protection, and under-voltage lockout to prevent deep battery
discharge.
The AP3441/L delivers 3A maximum output current while consuming
only 55μA of no-load quiescent current. Ultra-low RDS(ON) integrated
FB
1
8
SGND
PG
2
7
EN
VIN
3
6
LX
PGND
4
5
NC
MOSFETs and 100% duty cycle operation make the AP3441/L an
ideal choice for high output voltage, high current applications which
require a low dropout threshold. Pulse skip mode to maintain high
efficiency at light-load conditions.
The AP3441/L is available in U-DFN2020-8 (Type E) package.
U-DFN2020-8 (Type E)
Applications
Features
Post DC-DC Voltage Regulation
Set Top Boxes
Input Voltage: 2.7V to 5.5V
Notebook Computer
Output Voltage: 0.6V to VIN
PAD
0.6V Reference Voltage with ±1.5% Precision
55µA (Typical) No Load Quiescent Current
Shutdown Current:
