LTC3675_15 Datasheet, PDF (4/38 Pages) Linear Technology – 7-Channel Configurable High Power PMIC

LTC3675/LTC3675-1
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_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
5.5
V
l 2.35
2.45 2.55
V
l 2.45
2.55 2.65
V
2.7
V
2.8
V
UV[2], UV[1], UV[0] = 010
2.9
V
UV[2], UV[1], UV[0] = 011
3.0
V
UV[2], UV[1], UV[0] = 100
3.1
V
UV[2], UV[1], UV[0] = 101
3.2
V
UV[2], UV[1], UV[0] = 110
3.3
V
UV[2], UV[1], UV[0] = 111
3.4
V
V_{IN_HYS}
V_{IN_WARN(LSB)}
OT
V_IN Undervoltage Warning Hysteresis
Undervoltage Warning Threshold Step Size
Overtemperature Shutdown
50
mV
l 85
100 115
mV
150
°C
OT_WARN
Overtemperature Warning Threshold; Die OT[1], OT[0] = 00
Temperature Below OT that Causes IRQB = 0 OT[1], OT[0] = 01
OT[1], OT[0] = 10
OT[1], OT[0] = 11
10
°C
20
°C
30
°C
40
°C
I_{VIN_ALLOFF}
Input Supply Current
All Switching Regulators and LED Driver
in Shutdown, ONB = HIGH; Sum of All V_IN
Currents
16
28
µA
f_OSC
Voltage Regulator Switching Frequency
All Voltage Regulators
l 1.8
2.25 2.7
MHz
V_PGOOD(FALL) Falling PGOOD Threshold Voltage
Full-Scale (1,1,1,1) Reference Voltage
l 88
92
96
%
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)
105 200
µA
20
50
µA
I_FWD1,2
PMOS Current Limit
(Note 6)
2.25
2.8 3.35
A
V_FB1,2(HIGH) Feedback Regulation Voltage
Pulse-Skipping Mode Full-Scale (1,1,1,1) l 780
800 820
mV
V_FB1,2(LOW) Feedback Regulation Voltage
Pulse-Skipping Mode Full-Scale (0,0,0,0) l 405
425 445
mV
V_LSB1,2
FB1, FB2 Regulation Voltage Step Size
25
mV
I_FB12
Feedback Leakage Current
V_FB1= V_FB2 = 0.85V
–50
50
nA
D_MAX1,2
Maximum Duty Cycle
V_FB1= V_FB2 = 0V
l 100
%
R_PMOS1,2
PMOS On-Resistance
I_SW1 = I_SW2 = 100mA
265
mΩ
R_NMOS1,2
NMOS On-Resistance
I_SW1 = I_SW2 = –100mA
280
mΩ
I_LEAKP1,2
PMOS Leakage Current
EN1 = EN2 = 0
–2
2
µA
I_LEAKN1,2
R_SWPD1,2
NMOS Leakage Current
EN1 = EN2 = 0
Output Pull-Down Resistance in Shutdown EN1 = EN2 = 0 (I²C Bit Set)
–2
2
µA
10
kΩ
t_SS1,2
Soft-Start Time
500
µs
500mA Buck Regulator (Buck Regulators 3 and 4)
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
µA
20
50
µA
0.75
1.2 1.65
A
36751fc
4
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