Power Management AAC242/243

© Copyright 2010- ASIC Advantage, Inc. – AADS00012 / R127B

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Preliminary

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October 2010

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PARAMETER

PARAMETERS

UNITS

CONDITIONS

MIN.

TYP.

MAX.

OUTPUT SECTION

Voltage Out Low

0.4

V

Isink = 20mA

Voltage Out Low

2.2

V

Isink = 200mA

Voltage Out High

13.5

14

V

Isink = 20mA

Voltage Out High

12.5

13.5

V

Isink = 200mA

Voltage Out UVLO

1.1

V

Vcc=6V, Isink = 1mA

Voltage Output Rise Time

30

50

ns

Voltage Output Fall Time

30

50

ns

Current Output Source Peak

1.2

A

Current Output Sink Peak

0.7

A

UNDER-VOLTAGE LOCKOUT SECTION

Voltage Start Threshold (142)

15

16

17

V

Voltage Start Threshold (143)

7.8

8.4

9

V

Voltage Turnoff Threshold (142)

9

10

11

V

Voltage Turnoff Threshold (143)

7

7.6

8.2

V

Zener Clamp Voltage

30

34

V

TOTAL DEVICE SECTION

Start-up Supply Current

0.4

0.6

mA

Operating Supply Current

11

mA

The improved switching performance increases the high peak current associated with internal and external

capacitances and will require careful grounding and PCB trace routing. Bypass and timing capacitors should be of

high quality and located carefully with short traces. The reference capacitor must be located very close to the IC

with minimum trace lengths. A single point ground should be located at pin 5 ground. The use of a good ground

plane is recommended. Under certain conditions of high peak currents it may be advisable to isolate the Vref pin

from the bypass capacitor with a resistor to prevent interaction of the high current with the internal oscillator

operation.

Charge and discharge times are given by the following formulas:

-1

Oscillator simplified circuit.

Rt

8

1

2

3

4

5

6

7

Vref

COMP

FB

Isense

R/C

GND

OUT

Vcc

Ct