AAT1270

1A Step-Up Current Regulator for Flash LEDs

4

1270.2007.07.1.0

1. The AAT1270 is guaranteed to meet performance specification from 0˚C to +70˚C. Specification over the –40˚C to +85°C operating

temperature range is assured by design, characterization and correlation with statistical process controls.

Electrical Characteristics

1

V

ues are T

Symbol

Description

Conditions

Min

Typ

Max Units

Power Supply

V

IN

Input Voltage Range

2.7

5.5

V

V

OUT(MAX)

Maximum Output Voltage

5.5

V

FLEN = IN, Set FL Load = 1A

0.57

1

I

IN(Q)

V

EN/SET = IN, Set FL Load = 0A,

0.23

mA

R

I

SHDN(MAX)

V

EN/SET = FLEN = FLINH = GND

1

µA

I

FL(TOTAL)

Total Output Current, Flash Mode

R

800

1000

1200

mA

I

FL(MATCH)

FLOUTA and FLOUTB Current

10

%

Matching

I

MM(TOTAL)

Total Output Current, Movie Mode

R

137

mA

Set = 100%;FLOUTA + FLOUTB

f

OSC

Switching Frequency

T

1.5

2.0

2.5

MHz

t

DEFAULT

Default ON time

C

1

s

T

SD

Thermal Shutdown Threshold

140

°C

T

SD(HYS)

Thermal Shutdown Hysteresis

15

°C

EN/SET/ FLEN/ FLINH Logic Control

V

EN/SET, FLEN Input Low

0.4

V

V

FLEN(L)

Threshold

V

EN/SET, FLEN Input High

1.4

V

V

FLEN(H

Threshold

I

EN/SET

EN/SET Input Leakage Current

V

-1

1

µA

I

FLEN

FLEN Input Leakage Current

V

-1

1

µA

V

T(FLINH)

FLINH Input Threshold Voltage

½ V

IN

V

R

IN(FLINH)

FLINH Input Resistance to AGND

200

kΩ

t

EN/SET(LOW)

EN/SET Serial Interface Low Time

0.3

75

µs

t

EN/SET(HI_MIN)

Minimum EN/SET High Time

50

ns

t

EN/SET(HI_MAX)

Maximum EN/SET High Time

75

µs

t

EN/SET(OFF)

EN/SET Off Timeout

500

µs

t

EN/SET(LAT)

EN/SET Latch Timeout

500

µs

t

FLEN_ON

FLEN ON Delay Time

EN/SET = GND

100

µs

t

FLEN_OFF

FLEN OFF Delay Time

EN/SET = GND

20

µs

t

FLINH_ON

FLINH ON Delay Time

100

µs

t

FLINH_OFF

FLINH OFF Delay Time

5

µs