Datasheet > A81407

A81407

更新时间： 2022-06-24 15:42:25

品牌	Logo	应用领域
急速微 - ALLEGRO		/
页数	文件大小	规格书
58页	3082K
描述
Multi-Output Regulator with Buck or Buck-Boost Pre-Regulator

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A81407 数据手册

Multi-Output Regulator with Buck or Buck-Boost Pre-Regulator,

4× LDO Outputs, Watchdog, 4× Gate Drivers, and SPI

A81407

ELECTRICAL CHARACTERISTICS ^[1]: Valid at 3.8 V ^[4]≤ V_VIN≤ 36 V, –40°C ≤ T_J≤ 150°C, V_ENB= High or V_ENBAT= High,

unless otherwise speciﬁed

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

GENERAL SPECIFICATIONS

After V_VIN> V_VIN(START)and VREG in regulating,

Buck-Boost Mode

3.8

5.5

13.5

Operating Input Voltage ^[2]

V_VIN

After V_VIN> V_VIN(START)and VREG in regulating,

Buck Mode

VIN UVLO Start Voltage

VIN UVLO Stop Voltage

VIN UVLO Hysteresis

V_VIN(START)

V_VIN(STOP)

V_VIN(HYS)

I_Q

V_VINrising

4.55

3.25

–

4.8

3.5

1.3

5.05

3.75

–

V_VINfalling

V_VIN(START)‒ V_VIN(STOP)

V_VIN= 13.5 V, V_VREG= 5.6 V (no PWM)

–

VIN Supply Quiescent Current ^[1][3]

V_VIN= 13.5 V,

V_ENBAT= Low and V_ENB= Low, T_J= 25°C

I_Q(SLEEP)

–

µA

PWM SWITCHING FREQUENCY AND DITHERING

Switching Frequency

Frequency Dithering

f_OSC

Dithering off

As a percent of f_OSC

V_VINrising

2.0

–

2.2

±10

9.0

2.4

–

MHz

Δf_OSC

8.5

–

9.5

–

VIN Dithering Start Threshold ^[2]

V_{VIN(DITHER,ON)}

V_VINfalling

7.8

–

8.3

8.8

–

VIN Dithering Stop Threshold ^[2]V_{VIN(DITHER,OFF)}

V_VINrising

SYSTEM (WATCHDOG) CLOCK

Internal Clock Frequency

f_SYS

–

MHz

Internal Clock Tolerance

f_SYS(TOL)

‒5

CHARGE PUMP (VCP AND VCP2)

V_VCP2– V_VIN, V_VIN≥ 9 V, I_VCP2> –5 mA,

Buck Mode

4.1

3.6

3.0

6.6

4.4

3.8

–

VCP2 Output Voltage

(for Pre-Regulator)

V_VCP2– V_VIN, 5.5 V < V_VIN≤ 9 V, I_VCP2> –5 mA,

Buck Mode

V_VCP2

V_VCP2– V_VIN, 3.8 V < V_VIN≤ 5.5 V,

V_REG= 5.35 V, I_VCP2> –5 mA, Buck-Boost Mode

V_VCP– V_VIN, V_VIN> 9 V, I_VCP> –1 mA,

Buck Mode

VCP Output Voltage

(for Gate Drivers)

V_VCP– V_VIN, 5.5 V < V_VIN≤ 9 V, I_VCP> –1 mA,

Buck Mode

V_VCP

V_VCP– V_VIN, 3.8 V < V_VIN≤ 5.5 V, V_VREG

5.35 V, I_VCP> –1 mA, Buck-Boost Mode

6.6

–

9.5

–

Switching Frequency

f_CPx

kHz

VCC PIN VOLTAGE

Output Voltage

V_VCC

V_VREG= 5.35 V

T_Jrising

–

4.4

–

THERMAL PROTECTION

Thermal Shutdown Threshold ^[2]

Thermal Shutdown Hysteresis ^[2]

T_TSD

T_HYS

165

–

°C

^[1]For input and output current speciﬁcations, negative current is deﬁned as coming out of the node or pin (sourcing), positive current is deﬁned as going into the node or

pin (sinking).

^[2]Ensured by design and characterization, not production tested.

^[3]Speciﬁcations at 25°C or 85°C are guaranteed by design and characterization, not production tested.

^[4]The lowest operating voltage is only valid if the conditions V_VIN> V_VIN(START)and V_VCP– V_VIN> V_VCP(UV,H)and V_VREGin regulating are satisﬁed before V_VINis reduced.

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

1...4 5 678 9 10...58

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