A Product Line of
Diodes Incorporated
PAM2304
3MHz, 1A STEP-DOWN DC-DC CONVERTER
Description
The PAM2304 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 PAM2304 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce quiescent current under
light load operation to save power.
The PAM2304 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
1µA. Other key features include under-voltage lockout to prevent
deep battery discharge.
The PAM2304 is available in TSOT25 and U-DFN2020-6 packages.
Pin Assignments
Features
•
•
•
•
•
•
•
•
•
•
•
•
Efficiency up to 95%
Only 40µA (typ) Quiescent Current
Output Current: Up to 1A
Internal Synchronous Rectifier
3MHz Switching Frequency
Soft Start
Under-Voltage Lockout
Short Circuit Protection
Thermal Shutdown
Small TSOT25 and U-DFN2020-6 Packages
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Applications
•
•
•
•
•
•
•
•
•
Smart Phone
MID
Portable Electronics
Wireless Devices
Cordless Phone
Computer Peripherals
Battery Powered Widgets
Electronic Scales
Digital Frame
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
Typical Applications Circuit
R1
⎞
⎛
⎟
V
O
=
0 .6
× ⎜
1
+
⎝
R2
⎠
PAM2304
Document number: DS36386 Rev. 2 - 2
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June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2304
Pin Descriptions
Pin
Name
EN
GND
SW
V
IN
FB
AGND
PGND
NC
Function
TSOT25
1
2
3
4
5
—
—
—
U-DFN2020-6
4
6
1
5
3
—
—
2
Enable Control Input. Force this pin voltage above 1.5V, enables the chip, and below
0.3V shuts down the device.
Ground.
The drains of the internalmain and synchronous power MOSFET.
Chip main power supply pin.
Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
Analog Ground.
Main power ground return pin.
Not connected.
Functional Block Diagram
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
EN, FB Pin Voltage
SW Pin Voltage
Junction Temperature
Storage Temperature Range
Soldering Temperature
Rating
-0.3 to +6.0
-0.3 to V
IN
-0.3 to (V
IN
+0.3)
150
-65 to +150
300, 5 sec
Unit
V
V
V
°C
°C
°C
PAM2304
Document number: DS36386 Rev. 2 - 2
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June 2014
© Diodes Incorporated
A Product Line of
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PAM2304
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage
Operation Temperature Range
Junction Temperature Range
Rating
2.7 to 5.5
-40 to +85
-40 to +125
Unit
V
°C
Thermal Information
Parameter
Thermal Resistance (Junction to Case)
Thermal Resistance (Junction to Ambient)
Internal Power Dissipation (T
A
= +25°C)
Note:
Symbol
θ
JC
θ
JA
P
D
Package
TSOT25 (Note 4)
U-DFN2020-6
TSOT25
U-DFN2020-6
TSOT25
U-DFN2020-6
Max
130
25
250
68
400
980
Unit
°C/W
mW
4. The maximun output current for TSOT25 package is limited by internal power dissipation capacity as
described in Application Information hereinafter.
Electrical Characteristics
(@T
A
= +25°C, V
IN
= 3.6V, V
O
= 1.8V, C
IN
= 10µF, C
OUT
= 10µF, L = 1µH, unless otherwise specified.)
Parameter
Input Voltage Range
Regulated Feedback Voltage
Reference Voltage Line Regulation
Regulated Output Voltage Accuracy
Peak Inductor Current
Output Voltage Line Regulation
Output Voltage Load Regulation
Quiescent Current
Shutdown Current
Oscillator Frequency
Drain-Source On-State Resistance
SW Leakage Current
High Efficiency
EN Threshold High
EN Threshold Low
EN Leakage Current
Over Temperature Protection
OTP
Hysteresis
Symbol
V
IN
V
FB
∆V
FB
V
O
I
PK
LNR
LDR
I
Q
I
SD
f
OSC
R
DS(ON)
I
LSW
η
V
EH
V
EL
I
EN
OTP
OTH
±0.01
150
30
1.5
0.3
I
O
= 100mA
V
IN
= 3V, V
FB
= 0.5V or V
O
= 90%
V
IN
= 2.5V to 5V, I
O
= 10mA
I
O
= 1mA to 800mA
No load
V
EN
= 0V
V
O
= 100%
V
FB
= 0V or V
O
= 0V
I
DS
= 100mA
P MOSFET
N MOSFET
3
1
0.30
0.35
±0.01
95
0.45
0.50
1
-3
1.5
0.2
0.5
40
0.5
1.5
70
1
Test Conditions
Min
2.5
0.588
0.6
0.3
+3
Typ
Max
5.5
0.612
Units
V
V
%/V
%
A
%/V
%
µA
µA
MHz
MHz
Ω
Ω
µA
%
V
V
µA
°C
°C
PAM2304
Document number: DS36386 Rev. 2 - 2
3 of 12
www.diodes.com
June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2304
Typical Performance Characteristics
(@T
A
= +25°C, C
IN
= 10µF, C
OUT
= 10µF, L = 1µH, unless otherwise specified.)
PAM2304
Document number: DS36386 Rev. 2 - 2
4 of 12
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June 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2304
Typical Performance Characteristics
(cont.)
(@T
A
= +25°C, C
IN
= 10µF, C
OUT
= 10µF, L = 1µH, unless otherwise specified.)
PAM2304
Document number: DS36386 Rev. 2 - 2
5 of 12
www.diodes.com
June 2014
© Diodes Incorporated
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