ADM8845(RevD) 데이터 시트보기 (PDF) - Analog Devices
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ADM8845 Datasheet PDF : 18 Pages
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Data Sheet
ADM8845
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, and 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
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
Ω 1× mode
3.5 5.1
Ω 1.5× mode
8.0 14
Ω 2× mode
LED Current
30
mA Guaranteed by design. Not 100% production tested. See 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
mV VCC = 3.6 V, ILED = 20 mA, all six LEDs enabled
Rev. D | Page 3 of 18
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