A8425 데이터 시트보기 (PDF) - Allegro MicroSystems

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A8425

High Current Photoflash Capacitor Charger with IGBT Driver for Two Li+ Batteries

Allegro MicroSystems 

A8425

High Current Photoflash Capacitor Charger

with IGBT Driver for Two Li+ Batteries

ELECTRICAL CHARACTERISTICS typical values valid at VIN = VBAT= 3.6 V, RSET = 40 kΩ, ISWlim = 2.0 A, and TA=25°C, unless otherwise noted

Characteristics

Symbol

Test Conditions

Min. Typ. Max. Unit

VBAT Pin Voltage Range1

VIN Pin Voltage Range1

UVLO Enable Threshold

UVLO Hysteresis

Switch Current Limit2

SW Current Limit to ISET Current Ratio

ISET Pin Voltage While Charging

ISET Pin Internal Resistance

GND Pin Internal Resistance

Switch On-Resistance

Switch Leakage Current1

VBAT

VIN

VINUV

VINUVhys

ISWlimMAX

ISWlimMIN

ISWlim/ISET

VSET

RSET(INT)

RGND(INT)

RSWDS(on)

ISWlk

VIN rising

Maximum, ISET = 55 μA

Minimum, ISET = 17 μA

ISET = 55 μA, CHARGE = high

ISET = 55 μA, CHARGE = high, ISW = 0 A (VBAT

disconnected)

ISET = 55 μA, CHARGE = high, ISW = 3.2 A

VIN = 3.6 V, ID = 800 mA, TA = 25°C

VSW = VBAT = 11 V, in shutdown

Shutdown (CHARGE = 0 V, TRIGGER = 0 V

1.5

–

11

V

3.0

–

5.5

V

2.55 2.65 2.75 V

–

150

–

mV

2.9

3.2

3.5

A

–

1.0

–

A

–

58.5

– kA/A

– 1.182 –

V

– 1.268 –

V

–

330

–

Ω

–

27

–

mΩ

–

0.2

–

Ω

–

–

1

μA

–

0.01

1

μA

VIN Pin Supply Current

IIN

Charging done

Charging (CHARGE = VIN, TRIGGER = 0 V)

Shutdown (CHARGE = 0 V, TRIGGER = 0 V)

–

25

50

μA

–

2

–

mA

–

0.01

1

μA

VBAT Pin Supply Current

CHARGE Pin Input Current

CHARGE Pin Input Voltage High1

CHARGE Pin Input Voltage Low1

CHARGE Pin Pull-down Resistor

Maximum Switch-off Timeout

Maximum Switch-on Timeout

¯D¯¯O¯¯N¯¯E¯ Pin Output Leakage Current1

¯D¯¯O¯¯N¯¯E¯ Pin Output Low Voltage1

Output Comparator Trip Voltage (measured as

VSW – VBAT; see 1 for VSEL= GND)

IBAT

ICHARGE

ICHARGE(H)

ICHARGE(L)

RCHARGE

toffMAX

tonMAX

IDONElk

VDONEL

VOUTTRIP

Charging done

Charging (CHARGE = VIN, TRIGGER = 0 V)

VCHARGE = VIN

Over input supply range, VIN

Over input supply range, VIN

32 μA into ¯D¯¯O¯¯N¯¯E¯ pin

VSEL = GND

VSEL = open

VSEL = VIN

–

–

1

μA

–

25

50

uA

–

36

–

μA

1.4

–

–

V

–

–

0.4

V

–

100

–

kΩ

–

18

–

μs

–

18

–

μs

–

–

1

μA

–

–

100 mV

31 31.5 32

V

–

35

–

V

–

39.4

–

V

Output Comparator Overdrive

Minimum dV/dt for ZVS Comparator

VOUTOV

dV/dt

200 ns pulse width (90% to 90%)

Measured at SW pin

–

200 400 mV

–

20

– V/μs

Continued on the next page …

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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