Advanced Monolithic Systems, Inc.

www.advanced-monolithic.com

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

AMS4122

ABSOLUTE MAXIMUM RATINGS

4.0V to 20V

Junction Temperature

+150ºC

F/B

-0.3 to +12.0V

Storage Temperature

-65ºC to +150ºC

EN

-0.3V to +20V

Lead temperature

260ºC

ELECTRICAL CHARACTERISTICS

PARAMETER

TEST CONDITIONS

AMS4122

Min.

Typ.

Max.

Units

Feedback voltage

F/B-1 and F/B-2

0.590

0.6

0.610

V

Full Load Output Current

Measured on each channel (note 4)

2

A

Feedback2 (note 1)

Two Phase Mode

1.3

2.5

V

Phase Shift between Outputs

Dual Output Mode

171

180

189

<º

Current Limit

Per Output

4

A

Phase current match

Dual Phase Single Output Mode

10

%

Oscillator Frequency

Note(2)

360

400

440

KHz

Maximum Duty Cycle

100

%

Enable Threshold

2.5

V

Enable Hysteresis

120

mV

Enable Pull-up Current

0.7

µA

Under Voltage Lockout

Threshold Rising

3.5

V

Under Voltage Lockout

Threshold Hysteresis

150

mV

Supply Current (Shutdown)

100

nA

Supply Current (Quiescent)

1.5

1.9

mA

Thermal Shutdown

135

°C

Total Power dissipation

Note (3)

2.5

W

2) The oscillators for each switching regulator are shifted by 180º of each-other to accommodate dual phase operation and reduce the ripples in the input

power supply.

3) The power dissipation for SO-8 EDP package is limited to 2.5W rated at 25

°C ambient temperatures. The thermal resistance Junction to Case is

45

°C/W. Total power dissipation for both switching regulators should be taken in consideration when calculating the output current for each regulator.

4) The load current is specified for two output configuration. The output load it is dependent of the output voltage. The total output power should be kept

under 6W/channel to avoid thermal shut-down.