PAM2308 Datasheet, PDF (2/15 Pages) Power Analog Micoelectronics – Dual High-Efficiency PWM Step-Down DC-DC Coverter

PAM2308
Dual High-Efficiency PWM Step-Down DC-DC Coverter
Typical Application
V_OUT1
C_OUT1
10μF
C_IN2
4.7μF
V_IN2
L1
PAM2308
1
EN1
10
LX1
2
FB1
8
VIN1
4
GND
9
GND
3
VIN2
7
FB2
5
LX2
6
EN2
C_IN1
4.7μF
V_IN1
L2
C_OUT2
V_OUT2
10μF
V_OUTx = 1.2V,1.5V,1.8V,2.5V, 2.8V or 3.3V
Figure 2. Fixed Voltage Regulator
Block Diagram
1.5M
OSC
SLOPE
COMP
OSC
FBx
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