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ADM8845ACPZ-REEL1 Datasheet(PDF) 3 Page - Analog Devices

No. de pieza ADM8845ACPZ-REEL1
Descripción Electrónicos  Charge Pump Driver for LCD White LED Backlights
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
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ADM8845ACPZ-REEL1 Datasheet(HTML) 3 Page - Analog Devices

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ADM8845
Rev. 0 | Page 3 of 20
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
Min
Typ
Max
Unit
Test Conditions
INPUT VOLTAGE, VCC
2.6
5.5
V
SUPPLY CURRENT, ICC
2.6
5
mA
All six LEDs disabled, VCC = 3.3 V, RSET = 7.08 kΩ
CTRL1 = 1, CRTL2 = 1
SHUTDOWN CURRENT
5
µA
CHARGE PUMP FREQUENCY
1.5
MHz
CHARGE PUMP MODE THRESHOLDS
1.5× to 2×
3.33
V
Accuracy
4
%
2× to 1.5×
3.36
V
Accuracy
4
%
Hysteresis
40
mV
1× to 1.5×
4.77
V
Accuracy
4
%
1.5× to 1×
4.81
V
Accuracy
4
%
Hysteresis
40
mV
ISET PIN
LED : LED Matching
−1
+1
%
ILED = 20 mA, VFB =0.4 V
LED : ISET Accuracy
−1
+1
%
ILED = 20 mA, RSET = 7.08 kΩ, VFB = 0.4 V, VCC = 3.6 V,
TA = 25°C
ISET Pin Voltage
1.18
V
ILED to ISET Ratio
120
MIN COMPLIANCE ON FBx PIN
0.2
0.3
V
ISET = 20 mA
Charge Pump Output Resistance
1.2
1.8
1× mode
3.5
5.1
1.5× mode
8.0
14
2× mode
LED Current
30
mA
See Note 1 and Figure 21
PWM
0.1
200
kHz
DIGITAL INPUTS
Input High
0.5 VCC
V
Input Low
0.3 VCC
V
Input Leakage Current
1
µA
CHARGE PUMP POWER EFFICIENCY
88
%
CTRL1 = 1, CRTL2 = 1, VCC = 3.4 V, VFB = 0.2 V, IFB = 20 mA
VOUT RIPPLE
30
m V
VCC = 3.6 V, ILED = 20 mA, all six LEDs enabled
_______________________
1 Guaranteed by design. Not 100% production tested.


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