PAM2301 Datasheet, PDF (2/13 Pages) Power Analog Micoelectronics – 800mA Step-Down DC-DC Converters

PAM2301
800mA Step-Down DC-DC Converters
Block Diagram
FB
R1
R2
EN
1.5M
OSC
SLOPE
COMP
FREQ
SHIFT
OSC
-
EA
VIN
+
COMP
0.6VREF
SHUTDOWN
PWM
COMP
+
IAMP
-
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
VOUT/FB
VIN
5
4
BA V Y W
1
2
3
EN GND SW
BA: Product Code of PAM2301
V: Output Voltage
Y: Year
W: Week
Pin Number
1
2
3
4
5
Name
EN
GND
SW
VIN
V O UT /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
2
09/2008 Rev 1.3