LTC3675_12 Datasheet, PDF (5/38 Pages) Linear Technology – 7-Channel Confi gurable High Power PMIC

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
R_SWPD3,4
NMOS Leakage Current
EN3 = EN4 = 0
Output Pull-Down Resistance in Shutdown EN3 = EN4 = 0 (I²C Bit Set)
–1
1
μA
10
kΩ
t_SS3,4
Soft-Start Time
500
μs
Buck Regulators Combined
I_FWD1+2
PMOS Current Limit
I_FWD2+3
PMOS Current Limit
I_FWD3+4
PMOS Current Limit
1A Boost Regulator
FB2 = V_IN (Note 6)
FB3 = V_IN (Note 6)
FB4 = V_IN (Note 6)
5.6
A
4
A
2.4
A
I_VIN5
PWM Mode
Burst Mode Operation
V_OUT5(MAX)
I_FWD5
Maximum Regulated Output Voltage
Forward Current Limit
V_FB5(HIGH)
V_FB5(LOW)
V_LSB5
I_FB5
DC_MAX5
R_PMOS5
Feedback Regulation Voltage
Feedback Regulation Voltage
FB5 Regulation Voltage Step Size
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
R_NMOS5
NMOS On-Resistance
I_LEAKP
PMOS Switch Leakage Current
I_LEAKN
NMOS Switch Leakage Current
R_OUTPD5
Output Pull-Down Resistance in Shutdown
t_SS5
Soft-Start Time
1A Buck-Boost Regulator
V_FB5 = 0.85V (Notes 4, 5)
V_FB5 = 0.85V (Notes 4, 5)
(Note 6)
PWM Mode Full-Scale (1,1,1,1)
PWM Mode Full-Scale (0,0,0,0)
V_FB5 = 0.85V
NMOS Switch
Boost Regulator Off
150 300
μA
35
60
μA
5.35
5.55 5.75
V
2.5
3.15 3.9
A
l 780
800 820
mV
l 405
425 445
mV
25
mV
–50
50
nA
90
%
260
mΩ
275
mΩ
–2
2
μA
–2
2
μA
10
kΩ
500
μs
I_VIN6
V_OUT6(LOW)
V_OUT6(HIGH)
I_FWD6
I_PEAK6
I_ZERO6
V_FB6(HIGH)
V_FB6(LOW)
V_LSB6
PWM Mode
Burst Mode Operation
Minimum Regulated Output Voltage
Maximum Regulated Output Voltage
Forward Current Limit
Peak Current Limit
Zero Current Limit
Feedback Regulation Voltage
Feedback Regulation Voltage
FB6 Regulation Voltage Step Size
V_FB6 = 0.85V (Note 4, 5)
V_FB6 = 0.85V(Note 4, 5)
PWM Mode (Note 6)
Burst Mode Operation (Note 6)
Burst Mode Operation
PWM Mode Full-Scale (1,1,1,1)
PWM Mode Full-Scale (0,0,0,0)
220 400
μA
20
40
μA
2.65 2.8
V
5.25
5.65
V
2.1
2.65 3.2
A
200
275 350
mA
–30
0
30
mA
l 780
800 820
mV
l 405
425 445
mV
25
mV
3675fa
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