Datasheet

UNISONIC TECHNOLOGIES CO., LTD
P1484A
LINEAR INTEGRATED CIRCUIT
3A, 23V, 340KHZ
SYNCHRONOUS RECTIFIED
STEP-DOWN CONVERTER

DESCRIPTION
The UTC P1484A is a synchronous buck regulator. The
device provides3A of continuous load current over a wide input
voltage of 5V~23V. Current mode control provides fast transient
response and cycle-bycycle current limit. An adjustable soft-start
prevents inrush current at turn-on
The UTC P1484A can provide low-ripple power, high
efficiency, and perfect transient characteristics. The duty ratio
varies linearly from 0% to 92% in the PWM control. The error
amplifier circuit and soft-start circuit included in this device can
prevent overshoot at startup. An enable function, an over current
protect (OCP) function and short circuit protect (SCP) are also
build inside, and when OCP happens, the operation frequency
will be reduced.

HSOP-8
FEATURES
* 3A Output Current
* Wide 6V~23V Operating Input Range
* Integrated Power MOSFET Switches
* Programmable Soft-Start
* Stable with Low ESR Ceramic Output Capacitors
* Fixed 340KHz Frequency
* Cycle-by-Cycle Over Current Protection

ORDERING INFORMATION
Ordering Number
P1484AG-SH2-R
Package
HSOP-8
Packing
Tape Reel
P1484AG-SH2-R

(1)Packing Type
(1) R: Tape Reel
(2)Package Type
(2) SH2: HSOP-8
(3)Green Package
(3) G: Halogen Free and Lead Free
MARKING
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Copyright © 2015 Unisonic Technologies Co., Ltd
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P1484A
LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
7
8

PIN NAME
NC
VIN
SW
GND
FB
COMP
EN
SS
DESCRIPTION
No Bonding
IC power supply pin.
Power Switching Output.
Ground.
Feedback Input.
Compensation Node.
Enable Input.
Soft-Start Control Input.
BLOCK DIAGRAM
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P1484A

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING (Note 1)
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Voltage
VIN
-0.3~+23
V
Switch Node Voltage
VSW
25
V
All Other Pins
-0.3~+6
V
Continuous Power Dissipation (TA=25°C) (Note 2)
PD
1.4
W
Junction Temperature
TJ
150
°C
Storage Temperature
TSTG
-65~+150
°C
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The maximum allowable power dissipation is a function of the maximum junction temperature TJ (MAX),
the junction-to-ambient thermal resistance θJA, and the ambient temperature TA. The maximum allowable
continuous power dissipation at any ambient temperature is calculated by PD (MAX)=(TJ (MAX) - TA)/ θJA.
Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the
regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from
permanent damage.

THERMAL DATA
PARAMETER
Junction to Ambient
Junction to Case
Note: Measured on JESD5 1-7, 4-layer PCB.
RATING
90
45
UNIT
°C/W
°C/W
PARAMETER
SYMBOL
RATING
Input Voltage
VIN
6~23
Output Voltage
VOUT
0.923~18
Ambient Operating Temperature
TOPR
-40~+85
Note: The device is not guaranteed to function outside of its operating conditions.
UNIT
V
V
°C


SYMBOL
θJA
θJC
RECOMMENDED OPERATING CONDITIONS
ELECTRICAL CHARACTERISTICS (VIN=12V, TA=+25°C, unless otherwise specified)
PARAMETER
Supply Current
Feedback Voltage
High-Side Switch On Resistance (Note)
Low-Side Switch On Resistance (Note)
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Transconductance
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
EN Shutdown Threshold Voltage
Input Under Voltage Lockout Threshold
Soft-Start Current
Thermal Shutdown (Note)
Note: Guaranteed by design, not tested.
SYMBOL
VFB
RDS(ON)1
RDS(ON)2
TEST CONDITIONS
VEN=2.0V, VFB=1.0V
6V ≤VIN ≤23V
VEN=0V, VSW=0V
Minimum Duty Cycle
From Drain to Source
TYP MAX UNIT
3.5
5
mA
0.900 0.923 0.946
V
70
mΩ
50
mΩ
10
μA
3.4
A
1.1
A
GCS
FOSC1
FOSC2
DMAX
5
300
VFB=0V
VFB=1.0V
VEN Rising
VIN Rising
VSS=0V
UNISONIC TECHNOLOGIES CO., LTD
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MIN
0.8
365
40
92
1.2
4
15
160
A/V
430
2.0
KHz
KHz
%
V
V
μA
°C
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P1484A

LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
R
V  0.923(1  BF 2 )
O
R
BF 1
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P1484A
TYPICAL CHARACTERISTICS
SW Wave
SCP SW Wave
VIN=12V, IO=0A
VIN=12V, IO=3A
5V
5V
0
0.1V
0
0.1V
0
0
-0.1V
-0.1V
1A
2.5A
0
-1A
0
0
10
20
Time (2μs/div)
0
10
20
Time (2μs/div)
Efficiency (%)

LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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