PAM2301
800mA 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
SOT23-5
VIN
VOUT/FB
5
4
BA: Product Code of PAM2301
V: Output Voltage
Y: Year
BA V Y W
W: Week
1
2
3
EN
GND
SW
Pin Number
Name
Function
Enable control input. Force this pin voltage above 1.5V, enables the chip, and
below 0.3V shuts down the device.
1
EN
2
3
4
GND
SW
Ground
The drains of the internal main and synchronous power MOSFET.
Chip main power supply pin
VIN
VOUT: Output voltage feedback pin, an internal resistive divider divides the
5
VOUT/FB 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 ]
