PAM2319 Datasheet, PDF (1/13 Pages) Power Analog Micoelectronics – Dual High-Efficiency PWM Step-Down DC-DC Coverter

PAM2319
Dual High-Efficiency PWM Step-Down DC-DC Coverter
Features
n Supply Voltage:2.7V to 5.5V
n Output Voltage:
Vo1 ADJ/1000mA
Vo2 ADJ/2000mA
n Low Quiescent Current:
Channel 1: 40uA; Channel 2: 55uA
n High Efficiency:
n Switching Frequency: 3MHz(Channel 1)
2.5MHz(Channel 2)
n Internal Synchronous Rectifier
n Soft Start
n Under-Voltage Lockout
n Short Circuit Protection
n Thermal Shutdown
n Small WDFN3X3-12L Pb-Free/Halogen
Free Package
n RoHS/REACH Compliant
Applications
n Portable Electronics
n Personal Information Appliances
n Wireless and DSL Modems
General Description
The PAM2319 is a dual step-down current-mode,
DC-DC converter. At heavy load, the constant-
frequency PWM control performs excellent
stability and transient response. To ensure the
longest battery life in portable applications, the
PAM2319 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce
quiescent current under light load operation.
The PAM2319 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,
USB, and other standard power sources. The dual
output voltages are adjustable from 1.0V to 3.3V .
Both channels employ 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
0.1μA. Other key features include under-voltage
lockout,soft-start,short circuit protection and
thermal shutdown.
Typical Application
VIN
2.7 V--5 .5V
C in
1 0 uF
0
VIN1( 4)
C in 1
1 uF
0
EN 1(9 )
C i n2
1uF
VIN2 (2 )
0
EN 2 (1 0)
(6 )SW1
PAM23 19
(7 )FB 1
( 12) SW2
(1 )FB2
(5 )PGN D1 (8)AGND 1 (3)AGND 2 (1 1)P GN D2
0
0
0
0
L1
1
1 .0u H
2
Co 1
10u F
R11
300k
C fw1
10 0 pF
0
R12
150k
L2
1
1 .0 uH
2
Co 2
10 uF
0
R21
150k
C fw2
10 0 pF
0
R22
150k
0
Figure 1. Adjustable Voltage Regulator
Vo1
1 .8 V/1 00 0 m A
Vo 2
1 .2 V/2 00 0 m A
Power Analog Microelectronics, Inc
www.poweranalog.com
1
12/2011 Rev1.1