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PAM2309 Datasheet

1A STEP-DOWN DC-DC CONVERTER

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A Product Line of
Diodes Incorporated
PAM2309
1A STEP-DOWN DC-DC CONVERTER
Description
The PAM2309 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
portable applications, the PAM2309 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce quiescent current under
light load operation to save power.
The PAM2309 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. 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
0.1µA. Other key features include under-voltage lockout to prevent
deep battery discharge.
The PAM2309 is available in TSOT25, DFN2x2-6 Pin and QFN3x3-16
Pin packages.
Pin Assignments
Top View
TSOT25
Features
Efficiency up to 96%
Only 40µA (typ) Quiescent Current
Output Current: Up to 1A
Internal Synchronous Rectifier
1.5MHz Switching Frequency
Soft-Start
Under-Voltage Lockout
Short Circuit Protection
Thermal Shutdown
5-pin Small TSOT25, DFN2x2-6 Pin and QFN3x3-16 Pin
Packages
Pb-Free Package
Applications
Cellular Phone
Portable Electronics
Wireless Devices
Cordless Phone
Computer Peripherals
Battery Powered Widgets
Electronic Scales
Digital Frame
PAM2309
Document number: DSxxxxx Rev. 2 - 1
1 of 17
www.diodes.com
January 2013
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

PAM2309 Datasheet

1A STEP-DOWN DC-DC CONVERTER

No Preview Available !

Typical Applications Circuit
A Product Line of
Diodes Incorporated
PAM2309
VO
=
0.5
×
⎜⎜⎛1 +
R1 ⎟⎞
R2
Pin Descriptions
Pin
Name
VIN
GND
EN
VOUT/FB
SW
NC
Function
Chip main power supply pin.
Ground
Enable control input. Force this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
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 0.5V.
The drains of the internal main and synchronous power MOSFET.
Not connected
Functional Block Diagram
PAM2309
Document number: DSxxxxx Rev. 2 - 1
2 of 17
www.diodes.com
January 2013
© Diodes Incorporated


Part Number PAM2309
Description 1A STEP-DOWN DC-DC CONVERTER
Maker Diodes
Total Page 17 Pages
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