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AS3490

Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s

6 Electrical Characteristics

+25ºC, unless otherwise specified.

Table 3. Electrical Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Unit

General Operating Conditions

Supply Voltage

2.5

3.7

5.5

V

ED

Supply Voltage

reduced performance

not all parameters within specification

2.3

V

Shutdown Current

ON=0V

0.5

2.0

µA

Operating Current

no load, PWM Normal mode

250

µA

Operating

Temperature

-30

25

85

ºC

DCDC Converter parameters

Output Voltage VOUT

automatically regulated

0.3V

_MAX

V

all other conditions with ON13=ON45

140

LE_PWM

Voltage VOUT due to

PWM signal

DCDC not in pulseskip or current limit

70

mV

Load current

VOUT<7.5V

0.0

100

mA



Overall Efficiency

LED mismatch <= 30mV,

86

%

85

86

86

Operating Frequency

All internal timings are derived from this

oscillator

-10%

2.0

+10%

MHz

Minimum on-time

60

ns

MDC

Maximum Duty Cycle

90

%

DCDC Switch

SW - VOUT

0.5



DCDC Switch

SW - GND

0.5



Output voltage soft start

softstart time

measured from first high signal on ON

1.2

ms

START

VOUT startup voltage

7.0

V

_MAX

Startup with PWM

Maximum duration between PWM pulses

during startup; see Figure 17 on page 11

10

11

12

ms

DCDC timeout time

the AS3490 enters shutdown

29

48

ms

Current Sources

LED1...LED3 output

voltage range

2.6

x2

3.3

x2

3.9

x2

V

LED1...LED3 output

current range

0.0

25.0

mA



LED1...LED3 current

source accuracy

1

-7.5

+7.5

%