A Product Line of
Diodes Incorporated
PAM2301
800mA STEP-DOWN DC-DC CONVERTER
Description Pin Assignments
The PAM2301 is a step-down current-mode, DC-DC converter. At
heavy load, the constant frequency PWM control performs excellent
stability and transient response. To ensure the longest battery life in
TSOT25
portable applications, the PAM2301 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce quiescent current under
light load operation to save power.
The PAM2301 supports a range of input voltages from 2.5V to 5.5V,
allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH
cell, USB and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage, while the part number suffix
PAM2301-XX indicates pre-set output voltage of 3.3V, 2.8V, 2.5V,
1.8V, 1.5V, 1.2V or adjustable. All versions employ internal power
switch and synchronous rectifier to minimize external part count and
realize high efficiency. During shutdown, the input is disconnected
from the output and the shutdown current is less than 0.1mA. Other
key features include under-voltage lockout to prevent deep battery
discharge.
The PAM2301 is available in TSOT25 package.
Applications
Cellular Phone
Features
Portable Electronics
Wireless Devices
Efficiency up to 96%
Cordless Phone
Only 40A (typ) Quiescent Current
Computer Peripherals
Output Current: Up to 800mA
Battery-Powered Widgets
Internal Synchronous Rectifier
Electronic Scales
1.5MHz Switching Frequency
Digital Frame
Soft Start
Under-Voltage Lockout
Short Circuit Protection
Thermal Shutdown
5-Pin Small TSOT25 Package
Pb-Free Package
Typical Applications Circuit
Fixed Output Voltage Adjustable Output Voltage
R1
= 0.6 1 +
V
O
R2
1 of 13 January 2013
PAM2301
Diodes Incorporated
www.diodes.com
Document number: DSxxxxx Rev. 2 - 7
A Product Line of
Diodes Incorporated
PAM2301
Pin Descriptions
Pin Number Pin Name Function
Enable Control Input. Force this pin voltage above 1.5V, enables the chip, and
1 EN
below 0.3V shuts down the device.
2 GND Ground
3 SW The drains of the internal main and synchronous power MOSFET.
4 VIN Power Supply
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.
Functional Block Diagram
2 of 13 January 2013
PAM2301
Diodes Incorporated
www.diodes.com
Document number: DSxxxxx Rev. 2 - 7