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 SPECIFICATIONS¹: 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

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

OUTPUT VOLTAGE SPECIFICATIONS

Pre-Regulator Output Voltage –

VREG Regulating

V_IN= 13.5 V, ENBAT = 1,

0.1 A ≤ I_VREG≤ 1 A

V_VREG

6.47

6.6

6.7

VREG pin open, measured at VLDO pin,

V_IN= 13.5 V, ENBAT = 1,

0.1 A ≤ I_VREG≤ 1 A

Pre-Regulator Output Voltage –

VLDO Regulating

V_VLDO(REG)

5.88

6.12

PULSE WIDTH MODULATION (PWM)

PWM Ramp Offset

V_PWMOFFSETV_COMPfor 0% duty cycle

–

400

1.7

1.5

–

V/ns

LX Rising Slew Rate²

SR_LX(RISE)

SR_LX(FALL)

V_IN= 13.5 V, 10% to 90%, I_VREG= 1 A

LX Falling Slew Rate²

–

Buck Minimum On-Time²

t_ON(BUCK,MIN)

–

160

–

Buck Minimum Off-Time

Buck Maximum Duty Cycle

Boost Minimum On-Time

Boost Maximum Duty Cycle

COMP to LX Current Gain

t_{OFF(BUCK,MIN)}

D_BUCK(MAX)

–

100

–

t_{ON(BOOST,MIN)}

–

120

–

D_BOOST(MAX)V_IN= 3.5 V

g_m(POWER)

–

4.5

4.8

0.96

–

A/V

A/µs

f_OSC= 2 MHz

3.84

0.76

5.76

1.16

Slope Compensation²

S_E

f_OSC= 400 kHz

INTERNAL MOSFET

V_IN= 13.5 V, T_J= ‒40°C ², I_DS= 0.1 A

–

mΩ

MOSFET On Resistance

MOSFET Leakage

R_DS(on)

_IN= 13.5 V, T_J= 25°C ², I_DS= 0.1 A

_IN= 13.5 V, T_J= 150°C, I_DS= 0.1 A

100

170

140

V_ENBAT≤ 2 V, V_LX= 0 V, V_IN= 13.5 V,

–

µA

−40°C ≤ T_J≤ 85°C ²

_ENBAT≤ 2 V, V_LX= 0 V, V_IN= 13.5 V,

I_FET(LEAK)

100

150

−40°C ≤ T_J≤ 125°C ²

_ENBAT≤ 2 V, V_LX= 0 V, V_IN= 13.5 V,

−40°C ≤ T_J≤ 150°C

ERROR AMPLIFIER

Open Loop Voltage Gain

Transconductance

A_VOL

g_m(EA)

–

550

–

750

±75

1.7

–

950

–

µA/V

µA

Output Current

I_O(EA)

Maximum Output Voltage

Minimum Output Voltage

COMP Pull-Down Resistance

V_O(EA,MAX)

V_O(EA,MIN)

R_COMP

1.3

–

2.1

200

–

kΩ

HICCUP = 1 or FAULT = 1 or IC disabled

–

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...3 4 567 8 9...30

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