PAM2305
1A Step-Down DC-DC Converters
Block Diagram
+
VIN
1.5M
OSC
SLOPE
COMP
IAMP
-
PWM
COMP
FB
FREQ
SHIFT
OSC
S Q
R Q
MAIN
SWITCH(PCH)
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
R1
R2
RS LATCH
ANTI-
SHOOT-
THRU
-
+
SW
EA
VIN
SYNCHRONOUS
RECTIFIER(NCH)
COMP
0.6VREF
EN
+
IRCMP
-
SHUTDOWN
GND
Pin Configuration& Marking Information
Top View
Top View
Top View
DFN 2x2 6L
SOT23-5
QFN 3x3 16L
BE: Product Code
of PAM2305
V: Output Voltage
Y: Year
W: Week
SW
5
1
2
3
VIN
GND
EN
16 15 14 13
VOUT/FB
GND
NC
EN
1
2
3
6
5
4
VIN
VIN
12
11
GND
GND
1
2
3
4
P2305V
XXXYW
10 VIN
VIN
GND
9
VOUT/FB
VIN
SW
5
6
7
8
4
X: Internal Code
VOUT/FB
Pin Description
Name
VIN
Function
Chip main power supply pin
Ground
GND
Enable control input. Force this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
EN
VOUT: Output voltage feedback pin, an internal resistive 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.
No connection
VOUT/FB
SW
NC
Power Analog Microelectronics,Inc
www.poweranalog.com
09/2008 Rev 1.2
2
PAM [ POWER ANALOG MICOELECTRONICS ]
