PAM2312 Datasheet, PDF (2/14 Pages) Power Analog Micoelectronics – 1A Step-Down DC-DC Converter

PAM2312
1A Step-Down DC-DC Converter
Block Diagram
1.5M
OSC
SLOPE
COMP
+
IAMP
-
VOUT/FB
R1
R2
EN
FREQ
SHIFT
OSC
-
EA
VIN
+
COMP
0.6VREF
SHUTDOWN
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
ANTI-
SHOOT-
THRU
+
IRCMP
-
VIN
MAIN
SWITCH( PCH)
SW
SYNCHRONOUS
RECTIFIER (NCH)
GND
Pin Configuration & Marking Information
Top View
SOT23-5
EN 1
GND 2
5 ^VOUT/FB
SW ³
4 _VIN
CG: Product Code
of PAM2312
V: Output Voltage
Y: Year
W: Week
X: Internal Code
Pin Description
Name
VIN
GND
EN
VOUT/FB
SW
F unction
Chip main power supply pin
Ground
Enable control input. Forc e this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
VOUT: Output voltage feedback pin, an internal resis tive divider divides the output
voltage down for comparison to the internal reference voltage.
FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
The drains of the internal main and synchronous power MOSFET.
Power Analog Microelectronics, Inc
www.poweranalog.com
2
05/2010 Rev1.0