Diodes PAM2320 User Manual
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Description
The PAM2320 is a 3A step-down DC-DC converter. At heavy load,
the constant-frequency PWM control performs excellent stability and
transient response. No external compensation components are
required.
The PAM2320 supports a range of input voltages from 2.7V to 5.5V,
allowing the use of a single Li+/Li-polymer cell, multiple Alkaline/NiMH
cell, and other standard power sources. The output voltage is
adjustable from 0.6V to the input voltage. The PAM2320 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 PAM2320 delivers 3A maximum output current while consuming
only 42µA of no-load quiescent current. Ultra-low R
MOSFETs and 100% duty cycle operation make the PAM2320 an
ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The PAM2320 is available in PSOP8 package.
DS(ON)
integrated
Features
• Output Current: Up to 3A
• Output Voltage: 0.6V to V
• Input Voltage: 2.7 to 5.5V
• Efficiency up to 95%
• 42µA (typ) No Load Quiescent Current
• Shutdown Current: <1µA
• 100% Duty Cycle Operation
• 1.5MHz Switching Frequency
• Internal Soft Start
• No external Compensation Required
• Current Limit Protection
• Thermal Shutdown
• PSOP-8 Package
IN
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3A LOW NOISE STEP-DOWN DC-DC CONVERTER
Pin Assignments
Applications
• 5V or 3.3V Point of Load Conversion
• Telecom/Networking Equipment
• Set Top Boxes
• Storage Equipment
• Video Cards
• DDR Power Supply
PAM2320
PAM2320
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Typical Applications Circuit
Pin Descriptions
Pin
Number
PSOP-8
Pin Name
1 NC
2 VIN
3 SW
4 GND
5 FB
6 NC
7 EN
8 NC
Functional Block Diagram
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PAM2320
⎞
⎛
1R
⎟
V
Not Connected.
Bias supply. Chip main power supply pin.
The drains of the internal main and synchronous power MOSFET.
Ground
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
Not Connected.
Enable control input. Force this pin voltage above 1.5V, enables the chip, and below 0.3V shuts down
the device.
Not Connected.
⎜
16.0O
⎜
⎝
+×=
⎟
2R
⎠
Function
PAM2320
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PAM2320
Absolute Maximum Ratings (@T
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 Rating Unit
Input Voltage VIN
SW Pin Voltage
FB Pin Voltage
EN Pin Voltage -0.3 to +6.0 V
Maximum Junction Temperature 150 °C
Storage Temperature Range -65 to +150 °C
Soldering Temperature 300, 5sec °C
Recommended Operating Conditions (@T
Parameter Rating Unit
Supply Voltage 2.7 to 5.5 V
Junction Temperature Range -40 to +125
Ambient Temperature Range -40 to +85
= +25°C, unless otherwise specified.)
A
6 V
-0.3 to (V
-0.3 to (V
+0.3)
IN
+0.3)
IN
= +25°C, unless otherwise specified.)
A
V
V
°C
Thermal Information
Parameter Symbol Package Max Unit
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
Internal Power Dissipation (@TA= 25°C)
θ
JA
θ
JC
P
D
PAM2320
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PSOP-8 90
PSOP-8 14
PSOP-8 1100 mW
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°C/W
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PAM2320
Electrical Characteristics (@T
Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage Range
Output Voltage Range
UVLO Threshold
Regulated Output Voltage Accuracy
Regulated Feedback Voltage
FB Leakage Current
Output Voltage Line Regulation LNR
Output Voltage Load Regulation LDR
Quiescent Current
Shutdown Current
Current Limit
Oscillator Frequency
Drain-Source On-State Resisitance
High Efficiency η 95 95 %
Analog Soft-Start Time
EN Threshold High
EN Threshold Low
EN Leakage Current
Over Temperature Protection OTP 150 °C
OTP Hysteresis OTH 30 °C
PAM2320
Document number: DSxxxxx Rev. 1 - 0
= +25°C, VIN = 3.6V, VO = 1.8V, CIN = 22µF, C
A
IN
O
Rising
V
IN
Hysteresis 240 mV
V
V
V
UVLO
VIN Falling
V
IO = 0 to 3A
O
V
I
f
R
DS(ON)
V
V
I
FB
I
I
SD
LIM
OSC
t
I
EN
0.591 0.600 0.609 V
FB
VO =1V
V
= 2.5V to 5V
IN
I
= 0A to 3A
O
No Load 42 90 µA
Q
VEN = 0V
From enable to output regulation 0.5 3 ms
S
1.5 V
EH
0.3 V
EL
High Side 0.85 mΩ
Low Side 60 mΩ
VIN = VEN = 0V
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= 22µF, L = 2.2µH, unless otherwise specified.)
O
2.7 5.5 V
0.6
VIN
V
2.4 2.5 V
1.8 V
-3 +2 %
0.2 µA
0.2 %/V
0.5 %/A
1 µA
4 A
1.2 1.5 1.8 MHz
-1.0 +1.0 µA
October 2012
© Diodes Incorporated
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