A Product Line of
Diodes Incorporated
PAM2327
FAST TRANSIENT 3.5A STEP-DOWN CONVERTER
Description
The PAM2327 is a 3.5A step-down synchronous converter. The
1.2MHz switching frequency enables the use of small external
components. The ultra-small 2mm x 2mm footprint and high efficiency
make the PAM2327 an ideal choice for portable applications.
The PAM2327 delivers 3.5A maximum output current while
consuming only 55µA no load quiescent current. Low R integrated
MOSFETs and 100% duty cycle operation make the PAM2327 the
ideal choice for high output voltage, high current applications which
require a low dropout threshold.
The PAM2327 provides excel lent transient response and output
accuracy across the operating range.
The PAM2327 maintains high efficiency throughout the load range.
The PAM2327 automatically optimizes efficiency during light load
mode (PSM) and maintains constant frequency and low output ripple
during PWM mode.
Over-temperature and short circuit protection safeguard the PAM2327
and system components from damage.
The PAM2327 is available in an ultra-small QFN2x2-12 package. The
product is rated over a temperature range of -40°C to +85°C.
Pin Assignments
Features
3.5A Maximum Output Current
Tiny 1.0µH Chip Inductor
Excellent Transient Response
Input Voltage: 2.5V to 5.5V
Adjustable Output Voltage: 1.0V to 4.0V
High Efficiency with 1.2MHz Switching Frequency
55µA No Load Quiescent Current
100% Duty Cycle Low-Dropout Operation
Internal Soft Start
Power Good Indicator
Over-Temperature and Current Limit Protection
Hiccup mode for output short protection
1µA Shutdown Current
-40°C to +85°C Temperature Range
Available in QFN2x2-12 Package
RoHS/REACH Compliant
Applications
Cellular Phone
Digital Cameras
Hard Disk Drives
MP3 Players
PDAs and Handheld Computers
Portable Media Players
USB Devices
Wireless Network Cards
Typical Applications Circuit
PAM2327
Document number: DS36277 Rev. 2 - 2
1 of 11
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July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2327
Pin Descriptions
Pin
Number
1
2, 11
3, 12
4
5
6
7
8
9
10
Pin
Name
PVIN
SW
PGND
AGND
NC
OUT
FB
EN
PG
VIN
Function
Supply Voltage to power FETs. PVIN is connected to VIN internally.
Switch Output. Pin 2 and 11 can be connected together.
Power Ground. Pin 3 and 12 can be connected together.
Quiet ground for controller circuits
Leave this pin open. Do not connect it to ground.
Input sense pin for output voltage
Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets the output voltage.
On/Off Control.
Power Good Indicator. The output of this pin is an open drain with internal pull up resistor to VIN. PG is pulled
up to VIN when the FB voltage is within 10% of the regulation level, otherwise it is LOW.
Supply Voltage to internal control circuitry. VIN is connected to PVIN internally.
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
Rating
Unit
Input Voltage
-0.3 to +6.5
V
EN, FB Pin Voltage
V
-0.3 to V
IN
SW Pin Voltage
Junction Temperature
Storage Temperature Range
Soldering Temperature
-0.3 to (V
IN
+0.3)
150
-65 to +150
300, 5sec
V
°C
°C
°C
PAM2327
Document number: DS36277 Rev. 2 - 2
2 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2327
Recommended Operating Conditions
(@T
A
= +25°C, unless otherwise specified.)
Parameter
Supply Voltage
Operation Temperature Range
Junction 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)
Symbol
θ
JC
θ
JA
Package
QFN2x2-12
QFN2x2-12
Max
16
80
Unit
°C/W
Electrical Characteristics
(@T
A
= +25°C, V
IN
= 3.3V, V
OUT
= 1.2V, C
IN
= 20µF, C
O
= 20µF, L = 1µH, unless otherwise specified.)
Parameter
Input Voltage Range
UVLO Threshold
Output Voltage Accuracy
Regulated Feedback Voltage
PMOS Current Limit
Output Voltage Line Regulation
Output Voltage Load Regulation
Quiescent Current
Shutdown Current
Oscillator Frequency
Drain-Source On-State Resisitance
SW Leakage Current
Start-Up Time
PSM Threshold
EN Threshold High
EN Threshold Low
EN Input Current
Over Temperature Protection
OTP Hysteresis
Symbol
V
IN
V
UVLO
V
OUT
V
FB
I
LIM
LNR
LDR
I
Q
I
SD
f
OSC
R
DS(ON)
I
LSW
t
S
I
TH
V
EH
V
EL
I
EN
OTP
OTH
I
O
= 10mA
Effciency
η
I
O
= 500mA to 1A
I
O
= 1.5A
I
O
= 2A
Output Ripple
Output Transient Ripple
PG Pin Trigger Delay
PG Pin Threshold (relative to V
OUT
)
PG Open Drain Impedance
(PG = PV
IN
)
PG Open Drain Impedance
(PG = Low)
250K
Ripple
V
PK-PK
I
O
= 10mA
I
O
≥
300mA
I
O
= 20mA to 1A
I
O
= 20mA to 2A
75
85
85
80
-5
-2
-10
-12
90
±10
500K
100
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V
EN
= 2V
1.2
150
30
81
90
90
89
+5
+2
+10
+12
%
%
µs
%
Ω
Ω
%
V
IN
= 3.3V, V
O
= 1.2V
1.2
0.4
4
250
I
DS
= 100mA
P MOSFET
N MOSFET
V
IN
= 3.3V to 5.5V
I
O
= 1mA to 2A
No Load
V
EN
= 0V
1.0
1.2
40
30
55
No Load
V
IN
Rising
Hysteresis
-4.0
0.591
0.60
4.8
0.5
1
2
100
1
1.6
70
50
1
1000
250
Test Conditions
Min
2.5
2.35
Typ
3.3
2.5
400
Max
5.5
2.65
550
+4.0
0.609
Units
V
V
mV
%
V
A
%/V
%
µA
µA
MHz
mΩ
mΩ
µA
µs
mA
V
V
µA
°C
°C
PAM2327
Document number: DS36277 Rev. 2 - 2
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2327
Typical Performance Characteristics
(@T
A
= +25°C, C
IN
= 20µF, C
O
= 20µF, V
O
= 1.2V, unless otherwise specified.)
PAM2327
Document number: DS36277 Rev. 2 - 2
4 of 11
www.diodes.com
July 2013
© Diodes Incorporated
A Product Line of
Diodes Incorporated
PAM2327
Typical Performance Characteristics
(cont.) (@T
A
= +25°C, C
IN
= 10µF, C
O
= 10µF, V
O
= 1.2V, unless otherwise specified.)
PAM2327
Document number: DS36277 Rev. 2 - 2
5 of 11
www.diodes.com
July 2013
© Diodes Incorporated
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