USR1051

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

3 of 4

www.unisonic.com.tw

QW-R103-065.b

ABSOLUTE MAXIMUM RATING

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

23

V

LX to AGND

V

LX to AGND (20ns)

-5~22

V

EN to AGND

V

FB, SS, COMP to AGND

-0.3~6.0

V

PGND to AGND

-0.3~+0.3

V

Ambient Temperature

-40~+85

°C

Junction Temperature

+150

°C

Storage Temperature

-65~+150

°C

Note: 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.

THERMAL DATA

PARAMETER

SYMBOL

RATING

UNIT

Junction to Ambient (Note 2)

50

°C/W

RECOMMENDED OPERATING CONDIIONS

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

5~23

V

Output Voltage

V

ELECTRICAL CHARACTERISTICS (Note 3)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX UNIT

Supply Voltage

5

23

V

Supply Current (Quiescent)

3.5

5

mA

Shutdown Supply Current

1

10

µA

Feedback Voltage

0.788

0.8

0.812

V

Load Regulation

0.5

%

Line Regulation

1

%

Feedback Voltage Input Current

200

nA

Off Threshold

0.6

V

EN Input Threshold

On Threshold

2

V

SS Time

2

ms

MODULATOR

Frequency

380

450

550

kHz

Maximum Duty Cycle

85

%

Controllable Minimum On Time

150

ns

Current Sense Transconductance

7

A/V

Error Amplifier Transconductance

180

µA/V

PROTECTION

Current Limit

3.5

4.5

A

150

°C

Over-Temperature Shutdown Limit

100

°C

Notes: 1. Devices are inherently ESD sensitive, handling precautions are required. Human body model rating: 1.5

kΩ in series with 100pF.

design.

3. Specification in BOLD indicate an ambient temperature range of -40°C~+85°C. These specifications are

guaranteed by design.