ADM8843EB-EVALZ Просмотр технического описания (PDF) - Analog Devices

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производитель

ADM8843EB-EVALZ

Four White LED Backlight Driver

Analog Devices 

Data Sheet

ADM8843

SPECIFICATIONS

VCC = 2.6 V to 5.5 V; TA = −40°C to +85°C, unless otherwise noted; C1, C2 = 1.0 µF; C3 = 2.2 µF; C4 = 4.7 µF.

Table 1.

Parameter

INPUT VOLTAGE, VCC

SUPPLY CURRENT, ICC

Min

Typ

2.6

2.6

SHUTDOWN CURRENT

CHARGE PUMP FREQUENCY

1.5

CHARGE PUMP MODE THRESHOLDS

1.5× to 2×

3.33

2× to 1.5×

3.36

Hysteresis

40

1× to 1.5×

4.77

1.5× to 1×

4.81

Hysteresis

40

ISET PIN

LED : LED Matching

0.3

ISET Pin Voltage

1.18

ILED-to-ISET Ratio

120

ILED-to-ISET Ratio Accuracy

±5%

MIN COMPLIANCE ON FBx PIN

0.15

CHARGE PUMP OUTPUT RESISTANCE

1.2

3.5

8.0

LED CURRENT

PWM1

0.1

DIGITAL INPUTS

Input High

0.7 VCC

Input Low

Input Leakage Current

CHARGE PUMP POWER EFFICIENCY

88

VOUT RIPPLE

30

Max

Unit Test Conditions

5.5

V

5

mA All four LEDs disabled, VCC = 3.3 V, RSET = 7.08 kΩ,

CTRL1 = 1, CRTL2 = 1

5

µA

MHz

V

V

mV

V

V

mV

%

ILED = 20 mA, VFB = 0.4 V

V

20

200

V

0.3 VCC

1

V

ISET = 15 mA

Ω

1× mode

Ω

1.5× mode

Ω

2× mode

mA

kHz

V

µA

%

CTRL1 = 1, CRTL2 = 1, VCC = 3.4 V, VFB = 0.2 V, IFB = 20 mA

mV

VCC = 3.6 V, ILED = 20 mA, all four LEDs enabled

1 Guaranteed by design. Not 100% production tested.

Rev. E | Page 3 of 16

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