PAM2301
800mA Step-Down DC-DC Converters
Block Diagram
1.5M
OSC
SLOPE
COMP
+
IAMP
-
VIN
FB
FREQ
SHIFT
R1
-
R2
VIN
OSC
S Q
R Q
RS LATCH
+ - +
PWM
COMP
+
EA
COMP
SWITCHING
LOGIC
AND
BLANKING
CIRCUIT
MAIN
SWITCH
(
PCH
)
ANTI
-
SHOOT
-
THRU
SW
SYNCHRONOUS
RECTIFIER
(
NCH
)
EN
0.6VREF
SHUTDOWN
+
IRCMP
-
GND
Pin Configuration& Marking Information
Top View
SOT23
-
5
VOUT/FB
5
VIN
4
BA V Y W
BA: Product Code of PAM2301
V: Output Voltage
Y: Year
W: Week
1
EN
2
GND
3
SW
Pin Number
1
2
3
4
5
Name
EN
GND
SW
VIN
VOUT/FB
Function
Enable control input. Force this pin voltage above 1.5V, enables the chip, and
below 0.3V shuts down the device.
Ground
The drains of the internal main and synchronous power MOSFET.
Chip main power supply pin
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.
Power Analog Microelectronics
,
Inc
www.poweranalog.com
09/2008 Rev 1.3
2
PAM [ POWER ANALOG MICOELECTRONICS ]
