PAM2301
800mA STEP-DOWN DC-DC CONVERTER
Description
The PAM2301 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 PAM2301 provides a power-saving Pulse-
Skipping Modulation (PSM) mode to reduce quiescent current under
light load operation to save power.
Pin Assignments
NEW PRODUCT
The PAM2301 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, while the part number suffix
PAM2301-XX indicates pre-set output voltage of 3.3V, 1.2V or
adjustable. 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 0.1mA. Other key features
include under-voltage lockout to prevent deep battery discharge.
The PAM2301 is available in TSOT25 package.
TSOT25
Applications
Cellular Phone
Portable Electronics
Wireless Devices
Cordless Phone
Computer Peripherals
Battery-Powered Widgets
Electronic Scales
Digital Frame
Features
Efficiency up to 96%
Only 40μA (typ) Quiescent Current
Output Current: Up to 800mA
Internal Synchronous Rectifier
1.5MHz Switching Frequency
Soft Start
Under-Voltage Lockout
Short Circuit Protection
Thermal Shutdown
TSOT25 Package
Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant.
2. See https://www.diodes.com/quality/lead-free/ 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.
PAM2301
Document number: DS36384 Rev. 3 - 2
1 of 13
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February 2018
© Diodes Incorporated
PAM2301
Typical Applications Circuit
Fixed Output Voltage
Adjustable Output Voltage
NEW PRODUCT
R1
V
O
½
0.6
1
R2
Pin Descriptions
Pin Number
1
2
3
4
5
Pin Name
EN
GND
SW
VIN
VOUT/FB
Function
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 internal main and synchronous power MOSFET.
Power Supply
VOUT: Output voltage feedback pin, an internal resistive divider divides the
output voltage down for comparison to the internal reference voltage.
FB: Feedback voltage to internal error amplifier, the threshold voltage is 0.6V.
Functional Block Diagram
PAM2301
Document number: DS36384 Rev. 3 - 2
2 of 13
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February 2018
© Diodes Incorporated
PAM2301
Absolute Maximum Ratings
(@T
A
= +25° unless otherwise specified.)
C,
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, 5s
Unit
V
V
V
°
C
°
C
°
C
NEW PRODUCT
Recommended Operating Conditions
(@T
A
= +25° unless otherwise specified.)
C,
Parameter
Supply Voltage
Operation Temperature Range
Juntion Temperature Range
Rating
2.5 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
Symbol
θ
JC
θ
JC
P
D
Max
130
250
400
Unit
°
C/W
mW
Electrical Characteristics
(@T
A
= +25° V
IN
= 3.6V, V
O
= 1.8V, C
IN
= 10µF, L = 4.7µH unless otherwise specified.)
C,
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
ΔV
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
-
-
-
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
Test Conditions
Min
2.5
0.588
-
-3
-
-
-
-
-
1.2
-
-
-
-
-
1.5
-
-
-
-
Typ
-
0.600
0.3
-
1.2
0.2
0.5
40
0.1
1.5
500
0.30
0.35
±0.01
96
-
-
±0.01
+150
+30
Max
5.5
0.612
-
+3
-
0.5
1.5
70
1.0
1.8
-
0.45
0.50
1
-
-
0.3
-
-
-
Units
V
V
%/V
%
A
%/V
%
µA
µA
MHz
kHz
Ω
Ω
µA
%
V
V
µA
°
C
°
C
PAM2301
Document number: DS36384 Rev. 3 - 2
3 of 13
www.diodes.com
February 2018
© Diodes Incorporated
PAM2301
Typical Performance Characteristics
(@T
A
= +25° C
IN
= 10µF, C
O
= 10µF, L = 4.7µH, unless otherwise specified.)
C,
NEW PRODUCT
PAM2301
Document number: DS36384 Rev. 3 - 2
4 of 13
www.diodes.com
February 2018
© Diodes Incorporated
PAM2301
Typical Performance Characteristics
(Cont.) (@T
A
= +25° C
IN
= 10µF, C
O
= 10µF, L = 4.7µH, unless otherwise specified.)
C,
NEW PRODUCT
PAM2301
Document number: DS36384 Rev. 3 - 2
5 of 13
www.diodes.com
February 2018
© Diodes Incorporated
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