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 – BUCK AND BUCK-BOOST PRE-REGULATOR SPECIFICATIONS (continued)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

BOOST MOSFET (LG) GATE DRIVER

LG High Output Voltage

LG Low Output Voltage

LG Source Current¹

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

V_LG(ON)

V_LG(OFF)

I_LG(ON)

V_IN= 7 V, V_VREG= 6.35 V

4.6

–

0.2

–500

500

–

6.35

0.4

–

V_IN= 13.5 V, V_VREG= 6.85 V

V_IN= 7 V, V_VREG= 6.35 V, V_LG= 1 V

V_IN= 13.5 V, V_VREG= 6.85 V, V_LG= 1 V

V_IN= 13.5 V, V_VREG= 6.6 V, V_LG= 3 V

–

µA

LG Sink Current¹

I_LG(OFF)

I_LG(LEAK)

–

LG Leakage Current²

SOFT START

–

SS Ramp Time

t_SS(ramp)

–

0 V ≤ V_VREG≤ 3.3 V, V_COMP= V_O(EA,MAX)

f_OSC/8

f_OSC/2

f_OSC

SS PWM Frequency Foldback

f_SW(SS)

0 V ≤ V_VREG≤ 3.3 V

–

_VREG> 3.3 V

–

HICCUP MODE

PWM

cycles

V_VREG< 2.4 V (typical), V_COMP= V_O(EA,MAX)

_VREG> 2.4 V (typical), V_COMP= V_O(EA,MAX)

–

Hiccup OCP PWM Counts

t_HIC(OCP)

PWM

cycles

LX switching stops to LX switching starts,

during VREG overcurrent

Hiccup Mode Recovery Time

t_rec(HIC)

CURRENT PROTECTIONS

Pulse-by-Pulse Current Limit

LX Short-Circuit Current Limit

I_LIM

3.6

4.1

4.6

–

I_LIM(LX)

MISSING ASYNCHRONOUS DIODE (D1) PROTECTION

Detection Level

Time Filtering²

V_D(OPEN)

t_D(OPEN)

−1.5

−1.3

−0.9

–

250

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

1...4 5 678 9 10...30

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