Datasheet

LTC3675/LTC3675-1
6
36751fc
For more information www.linear.com/LTC3675
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3.6V. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
FB6
Feedback Leakage Current V
FB6
= 0.85V –50 50 nA
DC6
BUCK(MAX)
Maximum Buck Duty Cycle Duty Cycle of PMOS Switch A
l
100 %
DC6
BOOST(MAX)
Maximum Boost Duty Cycle Duty Cycle of NMOS Switch C 75 %
R
PMOS6
PMOS On-Resistance Switches A and D 260 mΩ
R
NMOS6
NMOS On-Resistance Switches B and C 275 mΩ
I
LEAKP
PMOS Switch Leakage Current –2 2 µA
I
LEAKN
NMOS Switch Leakage Current –2 2 µA
t
SS
Soft-Start Time 500 µs
R
OUTPD6
Output Pull-Down Resistance in Shutdown ENBB = 0 10 kΩ
LED Driver; R
LED_FS
= 20kΩ
I
VIN7
Input Current (MODE0 = MODE1 = 0) LED_OV = 0.85V (Notes 4, 5) 700 1000 µA
V
LED_OV
LED Overvoltage Threshold
Feedback Voltage
Operating in LED Mode
Operating in Boost Mode
l
l
805
770
825
800
845
830
mV
mV
V
LED_FS
LED Full-Scale Voltage
l
775 800 825 mV
V
LED1,2
LED Pin Regulation Voltage (Note 7) 300 mV
V
LED1,2_CLMP
LED Regulation Voltage Clamp
l
6.0 8.3 V
I
LIM7
Maximum Current Limit (Note 6) 1.6 1.85 2.15 A
I
LED_FS
LED Full-Scale Current
l
23.25 25.0 26.75 mA
I
LED_2FS
LED Full Current High Current Mode
l
46.5 50 53.5 mA
I
LED_MATCH
LED1 and LED2 Current Matching at
Full-Scale
|I
LED1
−I
LED2
|
I
LED1
+I
LED2
2






• 100
l
1 %
I
LED_LSB
LED Current LSB 98 µA
R
NMOS7
NMOS On-Resistance 300 mΩ
I
LEAK_NMOS7
NMOS Switch Leakage V
SW7
= 5.5V –1 1 µA
F
LEDOSC
Oscillator Frequency
l
450 562.5 675 kHz
DC
MAX7
Maximum Duty Cycle NMOS Switch 97 %
25mA Always-On LDO
V
LDOFB
Feedback Regulation Voltage
l
780 800 820 mV
R
DO
Dropout Resistance 12 Ω
I
2
C Port
DV
CC
Input Supply Voltage
l
1.6 5.5 V
I
DVCC
Input Supply Current SCL/SDA= 0kHz 0.3 1 µA
DV
CC_UVLO
DV
CC
UVLO 1 V
ADDRESS I
2
C Address LTC3675
LTC3675-1
l
l
0001001[R/WB]
0110100[R/WB]
V
IH
Input High Voltage SDA/SCL 70 %DV
CC
V
IL
Input Low Voltage SDA/SCL 30 %DV
CC
I
IH
Input High Current SDA/SCL –1 0 1 µA
I
IL
Input Low Current SDA/SCL –1 0 1 µA
V
OL_SDA
SDA Output Low Voltage I
SDA
= 3mA 0.4 V
f
SCL
Clock Operating Frequency 400 kHz