LTC3675 Datasheet, PDF (4/36 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.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP MAX
V_IN
V_{IN_FALLING}
V_{IN_RISING}
V_{IN_WARN}
Input Supply Range
Falling Undervoltage Threshold
Rising Undervoltage Threshold
Falling Undervoltage Warning Threshold
UV[2], UV[1], UV[0] = 000
UV[2], UV[1], UV[0] = 001
l 2.7
l 2.35
l 2.45
5.5
2.45 2.55
2.55 2.65
2.7
2.8
UV[2], UV[1], UV[0] = 010
2.9
UV[2], UV[1], UV[0] = 011
3.0
UV[2], UV[1], UV[0] = 100
3.1
UV[2], UV[1], UV[0] = 101
3.2
UV[2], UV[1], UV[0] = 110
3.3
UV[2], UV[1], UV[0] = 111
3.4
V_{IN_HYS}
V_{IN_WARN(LSB)}
OT
V_IN Undervoltage Warning Hysteresis
Undervoltage Warning Threshold Step Size
Overtemperature Shutdown
l 85
50
100 115
150
OT_WARN Overtemperature Warning Threshold; Die OT[1], OT[0] = 00
10
Temperature Below OT that Causes IRQB = 0 OT[1], OT[0] = 01
20
OT[1], OT[0] = 10
30
OT[1], OT[0] = 11
40
I_{VIN_ALLOFF}
Input Supply Current
All Switching Regulators and LED Driver
in Shutdown, ONB = HIGH; Sum of All V_IN
Currents
16
28
f_OSC
V_PGOOD(RISE)
Voltage Regulator Switching Frequency
Rising PGOOD Threshold Voltage
All Voltage Regulators
Full-Scale (1,1,1,1) Reference Voltage
l 1.8
2.25 2.7
93.5
V_PGOOD(HYS) PGOOD Hysteresis
All Regulators Except LED Driver
1
1A Buck Regulator (Buck Regulators 1 and 2)
I_VIN1,2
Pulse-Skipping Input Current
Burst Mode^® Operation Input Current
V_FB1 = V_FB2 = 0.85V (Notes 4, 5)
V_FB1 = V_FB2 = 0.85V (Notes 4, 5)
I_FWD1,2
PMOS Current Limit
(Note 6)
2.25
V_FB1,2(HIGH) Feedback Regulation Voltage
Pulse-Skipping Mode Full-Scale (1,1,1,1) l 780
V_FB1,2(LOW) Feedback Regulation Voltage
Pulse-Skipping Mode Full-Scale (0,0,0,0) l 405
V_LSB1,2
FB1, FB2 Regulation Voltage Step Size
I_FB12
Feedback Leakage Current
V_FB1= V_FB2 = 0.85V
–50
D_MAX1,2
Maximum Duty Cycle
V_FB1= V_FB2 = 0V
l 100
R_PMOS1,2
PMOS On-Resistance
I_SW1 = I_SW2 = 100mA
R_NMOS1,2
NMOS On-Resistance
I_SW1 = I_SW2 = –100mA
I_LEAKP1,2
PMOS Leakage Current
EN1 = EN2 = 0
–2
I_LEAKN1,2
NMOS Leakage Current
EN1 = EN2 = 0
–2
R_SWPD1,2
Output Pull-Down Resistance in Shutdown EN1 = EN2 = 0 (I²C Bit Set)
t_SS1,2
Soft-Start Time
500mA Buck Regulator (Buck Regulators 3 and 4)
105 200
20
50
2.8 3.35
800 820
425 445
25
50
265
280
2
2
10
500
I_VIN3,4
I_FWD3,4
Pulse-Skipping Input Current
Burst Mode Operation Input Current
PMOS Current Limit
V_FB3 = V_FB4 = 0.85V (Notes 4, 5)
V_FB3 = V_FB4 = 0.85V (Notes 4, 5)
(Note 6)
105 200
20
50
0.75
1.2 1.65
UNITS
V
V
V
V
V
V
V
V
V
V
V
mV
mV
°C
°C
°C
°C
°C
μA
MHz
%
%
μA
μA
A
mV
mV
mV
nA
%
mΩ
mΩ
μA
μA
kΩ
μs
μA
μA
A
3675f
4