ADM8845 View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'ADM8845' PDF : 18 Pages View PDF
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; 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
Accuracy
2× to 1.5×
3.36
Accuracy
Hysteresis
40
1× to 1.5×
4.77
Accuracy
1.5× to 1×
4.81
Accuracy
Hysteresis
40
ISET PIN
LED : LED Matching
−1
LED : ISET Accuracy
−1
ISET Pin Voltage
ILED to ISET Ratio
MIN COMPLIANCE ON FBx PIN
Charge Pump Output Resistance
LED Current
PWM
DIGITAL INPUTS
Input High
Input Low
Input Leakage Current
CHARGE PUMP POWER EFFICIENCY
VOUT RIPPLE
1.18
120
0.2
1.2
3.5
8.0
0.1
0.5 VCC
88
30
_______________________
1 Guaranteed by design. Not 100% production tested.
Max
5.5
5
5
4
4
4
4
+1
+1
0.3
1.8
5.1
14
30
200
0.3 VCC
1
Unit Test Conditions
V
mA
All six LEDs disabled, VCC = 3.3 V, RSET = 7.08 kΩ
CTRL1 = 1, CRTL2 = 1
µA
MHz
V
%
V
%
mV
V
%
V
%
mV
%
ILED = 20 mA, VFB =0.4 V
%
ILED = 20 mA, RSET = 7.08 kΩ, VFB = 0.4 V, VCC = 3.6 V,
TA = 25°C
V
V
ISET = 20 mA
Ω
1× mode
Ω
1.5× mode
Ω
2× mode
mA See Note 1 and Figure 21
kHz
V
V
µA
%
CTRL1 = 1, CRTL2 = 1, VCC = 3.4 V, VFB = 0.2 V, IFB = 20 mA
m V VCC = 3.6 V, ILED = 20 mA, all six LEDs enabled
Rev. 0 | Page 3 of 20
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