US203

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

3 of 7

www.unisonic.com.tw

QW-R502-435.K



PARAMETER

SYMBOL

RATINGS

UNIT

Supply Voltage

6.5

V

Enable Input Voltage

-0.3 ~ +6.5

V

Flag Voltage

6.5

V

0.4

W

Junction Temperature

150

°C

Storage Temperature

-65~150

°C

Notes: 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

RATINGS

UNIT

SOT-25

250

Junction to Ambient

SOP-8

190

°C/W



RECOMMENDED OPERATING CONDITIONS

PARAMETER

SYMBOL

RATINGS

UNIT

Supply Input Voltage

3.5 ~ 5.5

V

Enable Input Voltage

0 ~ 5.5

V

Junction Temperature

-40 ~ +125

°C

Ambient Operating Temperature

-40 ~ +85

°C



PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP MAX UNIT

SOT-25

80

100

Switch On Resistance

(US203A, US203B)

SOP-8

90

110

mΩ

SOT-25

80

100

Switch On Resistance

(US203C, US203D)

SOP-8

90

110

mΩ

25

45

Supply Current

0.1

1

μA

Logic-Low

0.8

V

EN Threshold Voltage

Logic-High

2.0

V

EN Input Current

0.01

μA

Output Leakage Current

0.5

10

μA

Output Turn-On Rise Time

400

μs

US203Ax

2.1

2.5

3.2

A

US203Bx

1.6

2.0

2.5

A

US203Cx

1.1

1.5

1.8

A

Current Limit

US203Dx

Current Ramp (< 0.1A/ms) on

0.6

0.8

1.1

A

US203Ax

1

A

US203Bx

1

A

US203Cx

1

A

Short Circuit Fold-Back

Current

US203Dx

thermal shutdown

1

A

FLAG Output Resistance

20

400

Ω

FLAG Off Current

0.01

1

μA

FLAG Delay Time

From fault condition to FLG

assertion

5

12

20

ms

Shutdown Pull-Low Resistance

75

150

Ω

Under-Voltage Lockout

1.3

1.7

V

Under-Voltage Hysteresis

0.1

V

Thermal Shutdown Protection

130

°C

Thermal Shutdown Hysteresis

20

°C

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