Datasheet

LTC3675/LTC3675-1
5
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
V
FB3,4(HIGH)
Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (1,1,1,1)
l
780 800 820 mV
V
FB3,4(LOW)
Feedback Regulation Voltage Pulse-Skipping Mode Full-Scale (0,0,0,0)
l
405 425 445 mV
V
LSB3,4
FB3, FB4 Regulation Voltage Step Size 25 mV
I
FB3,4
Feedback Leakage Current V
FB3
= V
FB4
= 0.85V –50 50 nA
D
MAX3,4
Maximum Duty Cycle V
FB3
= V
FB4
= 0V
l
100 %
R
PMOS3,4
PMOS On-Resistance I
SW3
= I
SW4
= 100mA 500 mΩ
R
NMOS3,4
NMOS On-Resistance I
SW3
= I
SW4
= –100mA 510 mΩ
I
LEAKP3,4
PMOS Leakage Current EN3 = EN4 = 0 –1 1 µA
I
LEAKN3,4
NMOS Leakage Current EN3 = EN4 = 0 –1 1 µA
R
SWPD3,4
Output Pull-Down Resistance in Shutdown EN3 = EN4 = 0 (I
2
C Bit Set) 10 kΩ
t
SS3,4
Soft-Start Time 500 µs
Buck Regulators Combined
I
FWD1+2
PMOS Current Limit FB2 = V
IN
(Note 6) 5.6 A
I
FWD2+3
PMOS Current Limit FB3 = V
IN
(Note 6) 4 A
I
FWD3+4
PMOS Current Limit FB4 = V
IN
(Note 6) 2.4 A
1A Boost Regulator
I
VIN5
PWM Mode
Burst Mode Operation
V
FB5
= 0.85V (Notes 4, 5)
V
FB5
= 0.85V (Notes 4, 5)
150
35
300
60
µA
µA
V
OUT5(MAX)
Maximum Regulated Output Voltage 5.35 5.55 5.75 V
I
FWD5
Forward Current Limit (Note 6) 2.5 3.15 3.9 A
V
FB5(HIGH)
Feedback Regulation Voltage PWM Mode Full-Scale (1,1,1,1)
l
780 800 820 mV
V
FB5(LOW)
Feedback Regulation Voltage PWM Mode Full-Scale (0,0,0,0)
l
405 425 445 mV
V
LSB5
FB5 Regulation Voltage Step Size 25 mV
I
FB5
Feedback Leakage Current V
FB5
= 0.85V –50 50 nA
DC
MAX5
Maximum Duty Cycle NMOS Switch 90 %
R
PMOS5
PMOS On-Resistance 260 mΩ
R
NMOS5
NMOS On-Resistance 275 mΩ
I
LEAKP
PMOS Switch Leakage Current –2 2 µA
I
LEAKN
NMOS Switch Leakage Current –2 2 µA
R
OUTPD5
Output Pull-Down Resistance in Shutdown Boost Regulator Off 10 kΩ
t
SS5
Soft-Start Time 500 µs
1A Buck-Boost Regulator
I
VIN6
PWM Mode
Burst Mode Operation
V
FB6
= 0.85V (Note 4, 5)
V
FB6
= 0.85V(Note 4, 5)
220
20
400
40
µA
µA
V
OUT6(LOW)
Minimum Regulated Output Voltage 2.65 2.8 V
V
OUT6(HIGH)
Maximum Regulated Output Voltage 5.25 5.65 V
I
FWD6
Forward Current Limit PWM Mode (Note 6) 2.1 2.65 3.2 A
I
PEAK6
Peak Current Limit Burst Mode Operation (Note 6) 200 275 350 mA
I
ZERO6
Zero Current Limit Burst Mode Operation –30 0 30 mA
V
FB6(HIGH)
Feedback Regulation Voltage PWM Mode Full-Scale (1,1,1,1)
l
780 800 820 mV
V
FB6(LOW)
Feedback Regulation Voltage PWM Mode Full-Scale (0,0,0,0)
l
405 425 445 mV
V
LSB6
FB6 Regulation Voltage Step Size 25 mV