AS3649 datasheet(5/39 Pages) AMSCO

5 / 39 page

AS3649

Datasheet - Electrical Character i s t ics

www.ams.com/AS3649

1.0-2

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6 Electrical Characteristics

VVIN = +2.7V to +4.4V, TAMB = -30ºC to +85ºC, unless otherwise specified. Typical values are at VVIN = +3.7V, TAMB = +25ºC, unless otherwise

specified.

Table 3. Electrical Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

General Operating Conditions

VVIN

Supply Voltage

Pin VIN

2.7

3.7

4.4

VVINREDUCED_

FUNC

Supply Voltage

AS3649 functionally working, but not all parameters

fulfilled

2.5

2.7

4.4

5.5

ISHUTDOWN

Shutdown Current

TXMASK/TORCH=L, STROBE=L, ON=L, VVIN<3.7V

1.0

2.0

µA

ISTANBY

Standby Current

Interface active, TXMASK/TORCH=L, STROBE=L

VVIN<3.7V

1.0

µA

TAMB

Operating Temperature

-30

ºC



Application Efficiency

(DCDC and current source)

LCOIL=0.6µH@3A, LESR=60m

, LED_OUT1,2=2000mA,

tFLASH<300ms, VFLED=3.7V

tFLASH

Flash Duration

VVIN>3.3V, TAMB<85ºC, ILED_OUT<2000mA

If TAMB or ILED_OUT is reduced or VVIN is increased,

longer flash times are allowed.

For longer flash durations, see section Current Reduction

by VIN Measurements in Flash Mode and Diagnostic

Pulse on page 15

300

DCDC Step Up Converter

VVOUT

DCDC Boost output

Voltage

(pin VOUT1/2)

2.8

5.5

RPMOS

On-resistance

DCDC internal PMOS switch



RNMOS

On-resistance

DCDC internal NMOS switch



fCLK

Operating Frequency

All internal timings are derived from this oscillator

-7.5%

4.0

+7.5%

MHz

VVOUT5V

DCDC Boost output

Voltage

(pin VOUT1/2)

Constant voltage mode operation const_v_mode (see

page 30)=1

5.0

Current Sources

VLED

LED forward voltage

Two flash LEDs, ILED_OUT<2x1000mA

2.8

3.32

4.0

Single flash LED, ILED_OUT<1800mA

2.8

3.32

4.4

ILED_OUT

LED_OUT1/2 current

combined

VVIN>3.3V, coil_peak=11b,

LCOIL=0.6µH@3.4A, LESR=60m



coil SPM3012T-1R0M,

tFLASH<300ms

dual flash LED,

current_boost=0

2000

single flash LED

2000

ILED_OUT_BO

OST

LED_OUT1/2 current

combined

Dual flash LED, current_boost=1

2500

ILED_OUT



LED_OUT1/2 current

source accuracy

Otherwise

-7

ILED_OUT=500mA...800mA, 0ºC<TJ<100ºC

-5

ILED_OUT

RAMP

LED_OUT1/2 ramp time

Rampup initiated by I

2C command

730

µs

Rampup started by STROBE

530

µs

Full range Ramp-down

500

µs

ILED_OUT

RIPPLE

LED_OUT current ripple

ILED_OUT = 1000mA

mAPP

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