Datasheet > A4409

A4409

更新时间： 2022-02-26 13:30:30

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
30页	1450K
描述
Buck or buck-boost pre-regulator

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A4409 数据手册

Adjustable Frequency Buck or Buck-Boost Pre-Regulator with

2 LDOs, Window Watchdog Timer, and NPOR

A4409

ELECTRICAL CHARACTERISTICS – LINEAR REGULATOR (LDO) SPECIFICATIONS ¹: Valid at 3 V ≤ V_IN≤ 36 V in buck-

boost mode and V_INhaving ﬁrst reached V_IN(START), –40ºC ≤ T_A= T_J≤ 150ºC, unless otherwise speciﬁed.

Characteristic

V5 LINEAR REGULATOR

V5 Accuracy and Load Regulation

V5 Dropout

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

V_V5

10 mA ≤ I_V5≤ 200 mA, V_VREG= 5.4 V

4.9

4.75

–

5.1

–

V_V5(DROPOUT)

C_V5(OUT)

I_V5= 200 mA, V_VLDO= 4.91 V

V5 Output Capacitance Range²

V5 OVERCURRENT PROTECTION

V5 Current Limit¹

µF

I_V5(LIM)

I_V5(FB)

V_V5= 5 V

V_V5= 0 V

−230

−80

−325

−120

–

V5 Foldback Current¹

−160

V5 STARTUP

V5 Startup Time²

t_V5(START)

C_V5≤ 2.9 µF, load = 25 Ω ±5% (200 mA)

–

0.24

5V0 LINEAR REGULATOR

5V0 Accuracy and Load Regulation

5V0 Dropout

V_5V0

10 mA ≤ I_5V0≤ 300 mA, V_VREG= 5.4 V

4.9

4.75

–

5.1

–

V_5V0(DROPOUT)I_5V0= 300 mA, V_VLDO= 4.91 V

C_5V0(OUT)

5V0 Output Capacitance Range²

5V0 OVERCURRENT PROTECTION

5V0 Current Limit¹

µF

I_5V0(LIM)

I_5V0(FB)

V_5V0= 5 V

V_5V0= 0 V

−345

−100

−485

−165

–

5V0 Foldback Current¹

5V0 STARTUP

−230

5V0 Startup Time²

t_5V0(START)

C_5V0≤ 2.9 µF, load = 20 Ω ±5% (250 mA)

–

0.24

¹Negative current is deﬁned as coming out of the node or pin (sourcing), positive current is deﬁned as going into the node or pin (sinking).

²Ensured by design and characterization, not production tested.

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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