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PAM2303 Datasheet

3A STEP-DOWN DC-DC CONVERTER

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A Product Line of
Diodes Incorporated
PAM2303
3A LOW NOISE STEP-DOWN DC-DC CONVERTER
Description
The PAM2303 is a 3A step-down DC-DC converter. It operates in two
different modes: PSM and PWM modes. At light load, it
automactically enters into the PSM mode to improve efficiency. At
heavy load, the constant frequency PWM control performs excellent
stability and transient response. No external compensation
components are required.
The PAM2303 supports a range of input voltages from 2.7V to 5.5V.
The output voltage is adjustable from 0.6V to the input voltage. The
PAM2303 employs 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 1µA. Other key features include over-
temperature and short circuit protection, and under-voltage lockout to
prevent deep battery discharge.
The PAM2303 delivers 3A maximum output current while consuming
only 42µA of no-load quiescent current. Ultra-Low RDS(ON) integrated
MOSFETs and 100% duty cycle operation make the PAM2303 an
ideal choice for high-output voltage, high-current applications which
require a low dropout threshold.
The PAM2303 is available in SOP-8(EP), DFN3X3-10 and QFN3X3-
16 package.
Pin Assignments
Features
Output Current: Up to 3A
Output Voltage: 0.6V to VIN
Input Voltage: 2.7 to 5.5V
Efficiency up to 95%
42µA (typ) No Load Quiescent Current
Shutdown Current: <1A
100% Duty Cycle Operation
1.5MHz Switching Frequency
Analog Soft Start
No external Compensation Required
Current Limit Protection
Thermal Shutdown
SOP-8(EP), DFN3X3-10 and QFN3X3-16 Package
Applications
5V or 3.3V Point of Load Conversion
Telecom/Networking Equipment
Set Top Boxes
Storage Equipment
Video Cards
DDR Power Supply
PAM2303
Document number: DSxxxxx Rev. 1 - 2
1 of 14
www.diodes.com
November 2012
© Diodes Incorporated


Diodes Semiconductor Electronic Components Datasheet

PAM2303 Datasheet

3A STEP-DOWN DC-DC CONVERTER

No Preview Available !

Typical Applications Circuit
A Product Line of
Diodes Incorporated
PAM2303
VO
=
0.6
×
⎜⎛1
+
R1
R2
⎟⎞
Pin Descriptions
Pin
Name
PGND
FB
GND
NC
EN
Test
VIN
PVIN
SW
Package Name
QFN3x3-16 SOP-8EP DFN3x3-10
1, 2, 3
2
436
544
6, 16
7
755
8
9
10, 11, 12
13, 14, 15
6
7
8
1
8, 9, 10
1, 2, 3
Function
Main power ground pin.
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
Signal ground for small signal components.
Not connected.
Enable control input. Force this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
Test mode. “Low”connection is recommended.
Bias supply. Chip main power supply pin.
Input supply for power stage. Must be closely decoupled to PGND.
The drains of the internalmain and synchronous power MOSFET.
Functional Block Diagram
PAM2303
Document number: DSxxxxx Rev. 1 - 2
2 of 14
www.diodes.com
November 2012
© Diodes Incorporated


Part Number PAM2303
Description 3A STEP-DOWN DC-DC CONVERTER
Maker Diodes
Total Page 14 Pages
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