Electrical characteristics (continued) – Rainbow Electronics MAX8645Y User Manual
Page 3

MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3.6V, V
GND
= V
PGND
= 0V, ENM1 = ENM2 = ENF = IN, R
SETM
= R
SETF
= 6.8k
Ω, P1 = P2 = unconnected, C
REF
= 0.01µF,
T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1x to 1.5x or 1.5x to 2x Mode
Transition Threshold
90
100
110
mV
Input Voltage-Mode Transition
Hysteresis
150
mV
Charge-Pump Maximum OUT
Current
V
IN
≥ 3.15V, V
OUT
= 3.9V
580
mA
1x mode (V
IN
- V
OUT
) / I
OUT
0.3
1.0
1.5x mode (1.5V
IN
- V
OUT
) / I
OUT
1.1
4.0
Open-Loop OUT Resistance
2x mode (2V
IN
- V
OUT
) / I
OUT
1.5
4.14
Ω
Charge-Pump Short-Circuit
Current
V
OUT
< 1.25V
500
mA
Switching Frequency
1
MHz
OUT Pulldown Resistance in
Shutdown
ENM_ = ENF = GND
5
k
Ω
LED DRIVER
SET_ Bias Voltage
T
A
= +25°C
0.6
V
T
A
= +25°C
0.01
1
SET_ Leakage in Shutdown
ENM_ = ENF = GND
T
A
= +85°C
0.1
µA
SET_ Current Range
10
145
µA
SETM-to-Main LED Current Ratio
(I
M_
/I
SETM
)
100% setting, M1–M6
230
A/A
SETF-to-Flash LED Current Ratio
(I
F_
/I
SETF
)
100% setting, F1 and F2
1380
A/A
T
A
= +25°C
-1.25
+1.25
M_, F_ Current Accuracy
T
A
= -40°C to current derating start temperature
-4
+4
%
Maximum Main LED Sink Current
R
SETM
= 4.6k
Ω, for each M_
30
mA
Maximum Flash LED Sink Current
R
SETF
= 4.12k
Ω, I
F1
+ I
F2
400
mA
Current-Derating-Function Start
Temperature
+40
°C
Current-Derating-Function Slope
T
A
= +40°C to +85°C
-1.7
%/°C
Dropout Voltage
(Note 2)
40
90
mV
1.5x and 2x Regulation Voltage
150
mV
T
A
= +25°C
0.01
2
M_, F_ Leakage in Shutdown
ENM_ = ENF = GND
T
A
= +85°C
0.1
µA
LDO_
Output Voltage Accuracy
I
LDO_
= 150mA, relative to V
OUT(NOM)
(Note 3)
-1.7
0
+1.7
%
Output Current Range
0
200
mA
Current Limit
V
LDO_
= 0V
280
475
750
mA
Soft-Start Current Limit
160
mA