AMS4155 datasheet(3/6 Pages) ADMOS

3 / 6 page

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com

Phone (925) 443-0722 Fax (925) 443-0723

AMS4155

ABSOLUTE MAXIMUM RATINGS

VIN

28V

-1V to +28V

F/B

-0.3V to +6V

COMP

-0.3V to +6V

SYNC

-0.3v to +6V

BST

VLX + 6V

Junction Temperature

+150

°C

Storage Temperature

-65

°C to +150°C

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds

260

°C

ELECTRICAL CHARACTERISTICS

Electrical Characteristics at TA= 25 °C and VIN=12V (unless otherwise noted).

PARAMETER

TEST CONDITIONS

AMS4155

Min.

Typ.

Max.

Units

Feedback Voltage

4.75V ≤ VIN ≤ 20V, VCOMP < 2V

1.215

1.255

1.285

Switch On Resistance

0.18

Ω

Switch Leakage

VEN = 0V; VLX = 0V

µA

Current Limit (1)

3.4

Current Amplifier Gain

1.9

A/V

Error Amplifier Voltage Gain

400

V/V

Error Amplifier Transconductance

∆IC = ± 10µA

730

µA/V

Oscillator Frequency

420

460

500

KHz

Sync Frequency

Sync Drive 0.5V to 2.7V

0.460

1.1

MHz

Maximum Duty Cycle

VFB = 1.0V

Minimum Duty Cycle

VFB = 1.5V

3.2

Enable Threshold

2.2

2.475

2.55

Enable Hysteresis

220

Enable Pull-up Current

0.7

µA

Under Voltage Lockout

Threshold Rising

2.4

2.5

2.6

Under Voltage Lockout

Threshold Hysteresis

200

Supply Current (Shutdown)

VEN ≤ 0.4V

µA

Supply Current (Quiescent)

VEN ≥ 2.8V; VFB = 1.5V

0.95

1.1

Thermal Shutdown

153

°C

Note:

1) Equivalent output current = 1.5A ≥ 50% Duty Cycle

2.0A ≤ 50% Duty Cycle

Assumes ripple current = 30% of load current.

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