Dual High-Efficiency PWM Step-Down DC-DC Coverter
PAM2306
Typical Application
L2
V
OUT2
V
IN2
1 VIN2
C
IN2
4.
7μF
2
LX2
PAM2306
EN2 12
NC2 11
FB2 10
GND
LX1
VIN1
L1
V
OUT1
C
OUT1
10μF
9
8
7
C
IN1
4.
7μF
V
IN1
C
OUT2
10 μ F
3 GND
4
FB1
5 NC1
6 EN1
V
OUTx
=
1.
2V,1.
5V,1.8V,2. 2.8V or 3.
5V,
3V
Figure 2. Fixed Voltage Regulator
Block Diagram
VINx
OSC
FBx
FREQ
SHIFT
-
+
- + +
1
.
5M
OSC
SLOPE
COMP
PWM
COMP
IAMP
+
-
S Q
EA
R1
R2
COMP
VIN
SWITCHING
LOGIC
AND
RS LATCH
BLANKING
CIRCUIT
MAIN
SWITCH
(
PCH
)
ANTI
-
SHOOT
-
THRU
R Q
LXx
SYNCHRONOUS
RECTIFIER
(
NCH
)
ENx
0
.
6VREF
SHUTDOWN
IRCMP
+
-
GND
Power Analog Microelectronics
,
Inc
www.poweranalog.com
2
07/2008 Rev 1.0