Rainbow Electronics MAX8645Y User Manual
Page 2
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(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)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
PIN, IN, OUT, REFBP to GND................................-0.3V to +6.0V
SETF, SETM, ENLDO, ENM1, ENM2, ENF,
P1, P2, LDO1, LDO2 to GND....................-0.3V to (V
IN
+ 0.3V)
M1, M2, M3, M4, M5, M6, F1,
F2 to GND.............................................-0.3V to (V
OUT
+ 0.3V)
C1N, C2N to GND ......................................... -0.3V to (V
IN
+ 1V)
C1P, C2P
to GND........ -0.3V to the greater of (V
OUT
+ 1V) or (V
IN
+ 1V)
PGND to GND .......................................................-0.3V to +0.3V
OUT, LDO1, LDO2 Short Circuit to GND ...................Continuous
Continuous Power Dissipation (T
A
= +70°C)
28-Pin TQFN 4mm x 4mm
(derate 20.8mW/°C above +70°C) .............................1666mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
IN Operating Voltage
2.7
5.5
V
Undervoltage-Lockout Threshold
V
IN
rising or falling
2.25
2.45
2.60
V
Undervoltage-Lockout Hysteresis
130
mV
1MHz switching, no load, 1.5x or 2x mode
4.0
5.5
1x mode 10% setting, ENF = GND, V
ENLDO
= V
IN
,
I
LDO1
= I
LDO2
= 0A
0.4
mA
Supply Current
ENM1 = ENM2 = ENF = GND, V
ENLDO
= V
IN
,
I
LDO1
= I
LDO2
= 0A
110
µA
T
A
= +25°C
0.01
5
Shutdown Supply Current
ENM1 = ENM2 = ENF = ENLDO = GND
T
A
= +85°C
0.1
µA
EN_ High Voltage
V
IN
= 2.7V to 5.5V
1.4
V
EN_ Low Voltage
V
IN
= 2.7V to 5.5V
0.4
V
T
A
= +25°C
0.01
1
EN_ Input Current
V
EN_
= 0V or 5.5V
T
A
= +85°C
0.1
µA
ENM_ or ENF Low Shutdown
Delay t
SHDN
See Figure 1
1.5
2.0
2.5
ms
ENM_ or ENF t
LO
See Figure 1
0.5
250.0
µs
ENM_ or ENF t
HI
See Figure 1
0.5
µs
Initial ENM_ or ENF t
HI
Only required for first ENM_ or ENF pulse; see Figure 1
200
µs
P1, P2 Shutdown Input Current
1
µA
P1, P2 Input Impedance
150
k
Ω
Thermal-Shutdown Threshold
Temperature rising
+160
°C
Thermal-Shutdown Hysteresis
20
°C
CHARGE PUMP
Overvoltage-Protection Threshold
V
OUT
rising
5
V
Soft-Start Time
2
ms