P1484AL-SH2-R [UTC]

Switching Regulator, Current-mode, PDSO8, LEAD FREE, HSOP-8;


型号：	P1484AL-SH2-R
厂家：	Unisonic Technologies
描述：	Switching Regulator, Current-mode, PDSO8, LEAD FREE, HSOP-8 开关光电二极管输出元件
文件：	总5页 (文件大小：251K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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

HSOP-8

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.

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

Lead Free

Package

HSOP-8

Packing

Halogen Free

P1484AG-SH2-R

P1484AL-SH2-R

Tape Reel

MARKING

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P1484A

LINEAR INTEGRATED CIRCUIT

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO.

PIN NAME

DESCRIPTION

No Bonding

V_IN

IC power supply pin.

Power Switching Output.

Ground.

GND

Feedback Input.

Compensation Node.

Enable Input.

COMP

Soft-Start Control Input.

BLOCK DIAGRAM

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P1484A

LINEAR INTEGRATED CIRCUIT

ABSOLUTE MAXIMUM RATING (Note 1)

PARAMETER

SYMBOL

V_IN

RATINGS

-0.3~+23

UNIT

Supply Voltage

Switch Node Voltage

V_SW

All Other Pins

-0.3~+6

1.4

Continuous Power Dissipation (T_A=25°C) (Note 2)

Junction Temperature

P_D

T_J

150

°C

Storage Temperature

T_STG

-65~+150

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 T_J(MAX),

the junction-to-ambient thermal resistance θ_JA, and the ambient temperature T_A. The maximum allowable

continuous power dissipation at any ambient temperature is calculated by P_D(MAX)=(T_J(MAX) - T_A)/ θ_JA.

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

SYMBOL

θ_JA

RATING

UNIT

°C/W

Junction to Ambient

Junction to Case

θ_JC

Note: Measured on JESD5 1-7, 4-layer PCB.

RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

V_IN

RATING

6~23

UNIT

Input Voltage

Output Voltage

V_OUT

0.923~18

-40~+85

Ambient Operating Temperature

T_OPR

°C

Note: The device is not guaranteed to function outside of its operating conditions.

ELECTRICAL CHARACTERISTICS (V_IN=12V, T_A=+25°C, unless otherwise specified)

PARAMETER

SYMBOL

TEST CONDITIONS

V_EN=2.0V, V_FB=1.0V

MIN TYP MAX UNIT

Supply Current

3.5

Feedback Voltage

V_FB

6V ≤V_IN≤23V

0.900 0.923 0.946

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

R_DS(ON)1

R_DS(ON)2

mΩ

μA

V_EN=0V, V_SW=0V

Minimum Duty Cycle

From Drain to Source

3.4

1.1

G_CS

A/V

Transconductance

Oscillation Frequency

F_OSC1

F_OSC2

D_MAX

305 340 375 KHz

Short Circuit Oscillation Frequency

Maximum Duty Cycle

V_FB=0V

1.2

KHz

V_FB=1.0V

V_ENRising

V_INRising

V_SS=0V

EN Shutdown Threshold Voltage

Input Under Voltage Lockout Threshold

Soft-Start Current

0.8

2.0

160

μA

°C

Thermal Shutdown (Note)

Note: Guaranteed by design, not tested.

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P1484A

LINEAR INTEGRATED CIRCUIT

TYPICAL APPLICATION CIRCUIT

BF2

)

BF1

= 0.923(1+

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P1484A

LINEAR INTEGRATED CIRCUIT

TYPICAL CHARACTERISTICS

SW Wave

V_IN=12V, I_O=0A

SCP SW Wave

V_IN=12V, I_O=3A

0.1V

-0.1V

2.5A

-1A

Time (2μs/div)

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.

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