ADM8843(Rev0) 查看數據表（PDF） - Analog Devices

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ADM8843
(Rev.:Rev0)

4 White LED Backlight Driver

Analog Devices 

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

SHUTDOWN CURRENT

CHARGE PUMP FREQUENCY

CHARGE PUMP MODE THRESHOLDS

1.5× to 2×

2× to 1.5×

Hysteresis

1× to 1.5×

1.5× to 1×

Hysteresis

ISET PIN

LED : LED Matching

ISET Pin Voltage

ILED to ISET Ratio

ILED to ISET Ratio Accuracy

MIN COMPLIANCE ON FBx PIN

CHARGE PUMP OUTPUT RESISTANCE

LED CURRENT

Min Typ

2.6

2.6

1.5

Max Unit

5.5

V

5

mA

5

µA

MHz

3.33

V

3.36

V

40

mV

4.77

V

4.81

V

40

mV

0.3

%

1.18

V

120

±5%

0.15

V

1.2

Ω

3.5

Ω

8.0

Ω

20

mA

Test Conditions

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

CTRL1 = 1, CRTL2 = 1

ILED = 20 mA, VFB = 0.4 V

ISET = 15 mA

1× mode

1.5× mode

2× mode

PWM

0.1

DIGITAL INPUTS

Input High

0.7 VCC

Input Low

Input Leakage Current

CHARGE PUMP POWER EFFICIENCY

88

VOUT RIPPLE

30

______________________

1 Guaranteed by design. Not 100% production tested.

200 kHz

V

0.3 VCC V

1

µA

%

mV

Note 1

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

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

Rev. 0 | Page 3 of 16

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