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 R
DS(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 V
IN
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
A Product Line of
Diodes Incorporated
PAM2303
Typical Applications Circuit
R1
⎞
⎛
⎟
V
O
=
0 .6
× ⎜
1
+
⎝
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
—
4
3
6
5
4
4
6, 16
—
7
7
8
9
10, 11, 12
13, 14, 15
5
6
7
8
1
5
—
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
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www.diodes.com
November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2303
Absolute Maximum Ratings
(@T
A
= +25°C, unless otherwise specified.)
These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability.
All voltages are with respect to ground.
Parameter
Input Voltage PV
IN
, V
IN
SW Pin Voltage
FB Pin Voltage
EN Pin Voltage
Maximum Junction Temperature
Storage Temperature Range
Soldering Temperature
Rating
6
-0.3 to (PV
IN
+0.3)
-0.3 to (V
IN
+0.3)
-0.3 to +6.0
150
-65 to +150
300, 5sec
Unit
V
V
V
V
°C
°C
°C
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage
Junction Temperature Range
Ambient Temperature Range
Rating
2.7 to 5.5
-40 to +125
-40 to +85
Unit
V
°C
Thermal Information
Parameter
Thermal Resistance (Junction to Ambient)
Symbol
θ
JA
Package
SOP-8EP
DFN3x3-10
QFN3x3-16
SOP-8EP
Thermal Resistance (Junction to Case)
θ
JC
DFN3x3-10
QFN3x3-16
Max
90
60
35
11
8.5
11
°C/W
Unit
PAM2303
Document number: DSxxxxx Rev. 1 - 2
3 of 14
www.diodes.com
November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2303
Electrical Characteristics
(@T
A
= +25°C, V
IN
= 3.6V, V
O
= 1.8V, C
IN
= 33µF, C
O
= 22µF, L = 2.2µH unless otherwise specified.)
Parameter
Input Voltage Range
Output Voltage Range
UVLO Threshold
Regulated Output Voltage Accuracy
Regulated Feedback Voltage
FB Leakage Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Quiescent Current
Shutdown Current
Current Limit
Oscillator Frequency
Drain-Source On-State Resistance
High Efficiency
PSM Threshold
Analog Soft Start Time
EN Threshold High
EN Threshold Low
EN Leakage Current
Over Temperature Protection
OTP
Hysteresis
Symbol
V
IN
V
O
V
UVLO
V
O
V
FB
I
FB
LNR
LDR
I
Q
I
SD
I
LIM
f
OSC
R
DS(ON)
η
I
TH
t
S
V
EH
V
EL
I
EN
OTP
OTH
V
IN
= V
EN
= 0V
-1.0
150
30
V
IN
= 3.3V, V
O
= 1.2V, L = 1µH
From enable to output regulation
1.5
0.3
+1.0
0.5
High Side
Low Side
1.2
V
O
= 1V
V
IN
= 2.5V to 5V
I
O
= 0A to 3A
No load
V
EN
= 0V
4
1.5
85
60
95
450
1.8
V
IN
Rising
Hysteresis
V
IN
Falling
I
O
= 0 to 3A
1.8
-3
0.591
-50
0.2
0.5
42
90
1
0.600
+3
0.609
+50
Test Conditions
Min
2.7
0.6
2.4
240
Typ
Max
5.5
V
IN
2.5
Units
V
V
V
mV
V
%
V
nA
%/V
%/A
µA
µA
A
MHz
mΩ
%
mA
ms
V
V
µA
°C
°C
PAM2303
Document number: DSxxxxx Rev. 1 - 2
4 of 14
www.diodes.com
November 2012
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2303
Typical Performance Characteristics
(@T
A
= +25°C, C
IN
= 10µF, C
O
= 10µF, L = 4.7µH unless otherwise specified.)
PAM2303
Document number: DSxxxxx Rev. 1 - 2
5 of 14
www.diodes.com
November 2012
© Diodes Incorporated
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