PAM2308
Dual High-Efficiency PWM Step-Down DC-DC Coverter
Typical Application
L1
VOUT1
COUT1
10μF
PAM2308
1
2
4
3
5
10
8
CIN1
4 7μF
LX1
VIN1
GND
EN1
FB1
.
VIN1
CIN2
4.7μF
9
7
6
GND
VIN2
LX2
VIN2
FB2
EN2
VOUT2
L2
COUT2
10μF
VOUTx = 1.2V,1.5V,1.8V,2.5V, 2.8V or 3.3V
Figure 2. Fixed Voltage Regulator
Block Diagram
VINx
+
IAMP
SLOPE
COMP
1.5M
OSC
-
PWM
COMP
OSC
FBx
MAIN
SWITCH(PCH)
S Q
FREQ
SHIFT
-
R1
R2
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
EA
+
R Q
LXx
ANTI-
SHOOT-
THRU
RS LATCH
COMP
SYNCHRONOUS
RECTIFIER(NCH)
VIN
ENx
0.6VREF
+
IRCMP
GND
SHUTDOWN
-
Power Analog Microelectronics,Inc
www.poweranalog.com
07/2008 Rev 1.0
2