A4407 데이터 시트보기 (PDF) - Allegro MicroSystems

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A4407

2.2 MHz Constant On-Time Buck Regulator With Two External and Two Internal Linear Regulators

Allegro MicroSystems 

A4407

2.2 MHz Constant On-Time Buck Regulator

With Two External and Two Internal Linear Regulators

VIN

5.2 V

13.5 V

6.5 V

5.5 V

4.9 V

ENBAT

VENBAT = 0V

ENBATS

ENB

Internal

VR AIL

or VCP

VREG

V5

V5P

3V3

1V2

CPOR

NPOR

VENB ≥ 2V prior to

VIN ramping up

Internal

UVLO

ENBATS is not connected

10 ms

VH = 5.00V

100 %Duty

Cycle

VL= 4.94V

VH= 2 .95 V

VH= 1.07V

V5, V5P, 3V3, 1V2 ramp at

approximately the same

rate as VREG

V5P tracks 3V3 until

V3V3UV(L) or VIN < 5.5 V

1.2 V

VREG > 5.00V and

3V3 > 2.95V and

1V2 > 1.07V

20 ms

VL= 1.01 V

NPOR is open-drain, pulled up to 3V3

ENB < 0.8V or

VREG < 4.94V or

3V3 < 2.83V or

1V2 < 1.01V or

VCP low or

VRAIL low

Internal regulators

collapse

Internal

UVLO

Decay rates of VREG, V5, V5P,

3V3, and 1V2 depend on output

capacitances and loading

VL=2.83 V

1.0 V

0.8 VMAX

Figure 11. Typical power up and power down via VIN with ENB always logic high; ENBAT and ENBATS are not used

Allegro MicroSystems, Inc.

18

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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