Diodes PAM2310 User Manual
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Description
The PAM2310 is a 2A 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 PAM2310 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 PAM2310 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 PAM2310 delivers 2A maximum output current while consuming
only 42µA of no-load quiescent current. Ultra-low R
MOSFETs and 100% duty cycle operation make the PAM2310 an
ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The PAM2310 is available in SOP-8 package.
DS(ON)
integrated
Features
• Output Current: Up to 2A
• Output Voltage: 0.6V to VIN
• Input Voltage: 2.7V to 5.5V
• Peak 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
• SOP-8 Package
Typical Applications Circuit
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2A 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
PAM2310
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PAM2310
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Pin Descriptions
Pin
Name
NC 1
VIN 2
SW 3
GND 4
FB 5
NC 6
EN 7
NC 8
Package Name Function
No Connected
Bias supply. Chip main power supply pin
The drains of the internalmain and synchronous power MOSFET.
GND
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
No Connected
Enable control input. Force this pin voltage above 1.5V, enables the chip,
and below 0.3V shuts down the device.
No Connected
Functional Block Diagram
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PAM2310
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
PAM2310
Document number: DSxxxxx Rev. 1 - 0
= +25°C, unless otherwise specified.)
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6 V
-0.3 to (V
-0.3 to (V
+0.3)
IN
+0.3)
IN
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PAM2310
Recommended Operating Conditions (@T
= +25°C, unless otherwise specified.)
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Parameter Rating Unit
Supply Voltage 2.7 to 5.5 V
Junction Temperature Range -40 to +125
Ambient Temperature Range -40 to +85
°C
Thermal Information
Parameter Symbol Package Max Unit
Thermal Resistance (Junction to Ambient)
Thermal Resistance (Junction to Case)
θ
JA
θ
JC
Internal Power Dissipation (@ TA = +25°C) PD
Electrical Characteristics (@T
= +25°C, VIN = 5.0V, VO = 1.8V, CIN = 22µF, C
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Parameter Symbol Test Conditions Min Typ Max Units
Input Voltage Range
Output Voltage Range
Regulated Output Votlage Accuracy
Regulated Feedback Voltage
FB Leakage Current
V
V
V
V
I
FB
Output Voltage Line Regulation LNR
Output Voltage Load Regulation LDR
Quiescent Current
Shutdown Current
Peak Inductor Current
Oscillator Frequency
Drain-Source On-State Resisitance
Start-Up Time
EN Threshold High
EN Threshold Low
EN Leakage Current
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R
DS(ON)
V
V
I
I
SD
LIM
OSC
t
I
EN
IN
O
IO = 0 to 2A, VIN = 2.7 to 5.5V
O
0.588 0.600 0.612 V
FB
VO =1V
V
= 2.7V to 5V
IN
I
= 0A to 2A
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No Load 42 90 µA
Q
VEN = 0V
ISW = 100mA
From enable to output regulation 0.5 3 ms
S
1.5 V
EH
0.3 V
EL
VIN = VEN = 0V
Over Temperature Protection OTP 150 °C
OTP Hysteresis OTH 30 °C
SOP-8 90
SOP-8 11
°C/W
SOP-8 1100 mW
= 22µF, L = 2.2µH, unless otherwise specified.)
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2.7 5.5 V
0.6
-2 +2 %
0.2 µA
0.2 %/V
0.5 %/A
1 µA
3
1.5 1.8 MHz
High Side 90 Ω
Low Side 70 Ω
-1.0 +1.0 µA
VIN
V
PAM2310
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Typical Performance Characteristics (@T
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= +25°C, CIN = 22µF, CO = 22µF, unless otherwise specified.)
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PAM2310
PAM2310
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