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Power Analog Micoelectronics

PAM2306 Datasheet Preview

PAM2306 Datasheet

Dual High-Efficiency PWM Step-Down DC-DC Coverter

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PAM2306
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 PAM2306 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
PAM2306 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce
quiescent current under light load operation.
The PAM2306 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 3.3V, 2.8V, 2.5V,
1.8V, 1.5V, 1.2V or adjustable. 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
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VIN2
CIN2
4 7μF
R12
CFw1
100 pF
VOUT1
L2
PAM2306
1 VIN2
EN2 12
2 LX2
3 GND
NC2 11
FB2 10
4 FB1
GND 9
5 NC1
8
LX1
R11 6 EN1
VIN1 7
L1
COUT2
10μF
R21
VOUT2
CFW2
100 pF
CIN1
4.7 μF
VIN1
R22
COUT1
10μF
( )VOUTx
=
VREF
1+
Rx1
Rx2
Figure 1. Adjustable Voltage Regulator
Power Analog Microelectronics,Inc
www.poweranalog.com
1
07/2008 Rev 1.0




Power Analog Micoelectronics

PAM2306 Datasheet Preview

PAM2306 Datasheet

Dual High-Efficiency PWM Step-Down DC-DC Coverter

No Preview Available !

PAM2306
Dual High-Efficiency PWM Step-Down DC-DC Coverter
Typical Application
VIN2
CIN2
4.7μF
L2
PAM2306
1 VIN2
EN2 12
2 LX2
NC2 11
3 GND
FB2 10
4 FB1
GND 9
5 NC1
8
LX1
6 EN1
VIN1 7
VOUT2
COUT2
10μF
CIN1
4.7μF
VIN1
VOUT1
L1
COUT1
10μF
VOUTx = 1.2V,1.5V,1.8V,2.5V, 2.8V or 3.3V
Figure 2. Fixed Voltage Regulator
Block Diagram
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1.5M
OSC
FBx
SLOPE
COMP
OSC
R1
R2
ENx
FREQ
SHIFT
-
EA
+
COMP
VIN
0.6VREF
SHUTDOWN
PWM
COMP
+
IAMP
-
VINx
SQ
RQ
SWITCHING
LOGIC
RS LATCH
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
+
IRCMP
-
MAIN
SWITCH(PCH)
LXx
SYNCHRONOUS
RECTIFIER(NCH)
GND
Power Analog Microelectronics,Inc
www.poweranalog.com
2
07/2008 Rev 1.0


Part Number PAM2306
Description Dual High-Efficiency PWM Step-Down DC-DC Coverter
Maker Power Analog Micoelectronics
Total Page 15 Pages
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