PAM2303 Datasheet, PDF (2/13 Pages) Power Analog Micoelectronics – 3A Low Noise Step-Down DC-DC Converter

PAM2303
3A Low Noise Step-Down DC-DC Converter
Block Diagram
1.5M
OSC
SLOPE
COMP
VIN
+
IAMP
-
PVIN
FB
R1
R2
EN
FREQ
SHIFT
OSC
-
EA
VIN
+
COMP
0.6VREF
SHUTDOWN
SQ
RQ
RS LATCH
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
MAIN
SWITC H (PCH )
ANTI-
SHOOT-
THRU
SYNCHRONOUS
+ ^{RECTIFIER (NCH)}
IRCMP
-
SW
PGND
GND
TEST
Pin Configuration & Marking Information
Top View
QFN 3X3-16
Top View
SOP-8(EP)
16 15 14 13
PGND 1
12 PVIN
PGND 2
PGND 3
P2303A
XXXYW
11 PVIN
10 PVIN
FB 4
9 VIN
56 78
87 65
P2303B
XXXYW
1234
A/B: Pin Configuration
Y: Year
W: Week
X: Internal Code
Pin Description
Name
PGND
FB
GND
NC
EN
Test
VIN
PVIN
SW
QFN3X3-16 SOP-8(EP)
Function
1,2,3
2
Main power ground pin
4
3
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
5
4
Signal ground for small signal components.
6,16
-
No connected
Enable control input. Force this pin voltage above 1.5V, enables the chip,
7
5
and below 0.3V shuts down the device.
8
6
Test mode. “Low”connection is recommended.
9
7
Bias supply. Chip main power supply pin
10,11,12
8
Input supply for power stage. Must be closely decoupled to PGND
13,14,15
1
The drains of the internal main and synchronous power MOSFET.
Power Analog Microelectronics, Inc
www.poweranalog.com
2
11/2011 Rev1.2