PAM2306D Datasheet, PDF (1/13 Pages) Power Analog Micoelectronics – Dual High-Efficiency PWM Step-Down DC-DC Coverter

PAM2306D
Dual High-Efficiency PWM Step-Down DC-DC Coverter
Features
n Efficiency up to 96%
n Only 40µA (Typ. per Channel) Quiescent
Current
n Output Current: Up to 1A per Channel
n Internal Synchronous Rectifier
n 1.5MHz Switching Frequency
n Soft Start
n Under-Voltage Lockout
n Short Circuit Protection
n Thermal Shutdown
n Small 12L WDFN3x3 Package
n Pb-Free Package and RoHS Compliant
Applications
n Cellular Phone
n Portable Electronics
n Personal Information Appliances
n Wireless and DSL Modems
n MP3 Players
General Description
The PAM2306D 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 PAM2306D provides a power-
saving Pulse-Skipping Modulation (PSM) mode to
reduce quiescent current under light load
operation.
The PAM2306D supports a range of input
voltages from 2.5V 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 available for adjustment.
All versions employ internal power switch and
synchronous rectifier for 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 to prevent deep battery discharge.
Typical Application
V _IN2
C4 I_.N_7μ2 _F
R12
CFw1
100 pF
V _OUT1
L2
PAM2306D
1 _{V IN2}
EN2 ¹²
2 _LX2
3 _GND
NC2 ¹¹
FB2 ¹⁰
4 _FB1
G ND ⁹
5 _NC1
8
LX 1
R11
6 _EN1
V IN1 ⁷
COUT2
10μF
R21
V_{OU T 2}
C_FW2
100 pF
C_IN1
4.7 μF
V IN1
R22
L1
C OU T 1
10μF
( ) ^VOUTx
=
VREF
1+
Rx1
Rx2
Power Analog Microelectronics, Inc
www.poweranalog.com
1
02/2012 Rev1.1