LTC3589_12 Datasheet, PDF (4/50 Pages) Linear Technology – 8-Output Regulator with Sequencing and I2C

LTC3589/LTC3589-1/
LTC3589-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T_A = 25°C (Note 2). V_IN = PV_IN1 = PV_IN2 = PV_IN3 = PV_IN4 = V_{IN_LDO2} = V_{IN_LDO34}
= DV_DD = 3.8V. All regulators disabled unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP MAX UNITS
V_IN
Operating Input Supply Voltage, V_IN
I_STANDBY V_IN Standby Current
f_OSC
Oscillator Frequency
Step-Down Switching Regulators 1, 2, and 3
l 2.7
All Enables = 0V, PWR_ON = 0, I_LDO1 = 0 l
l 1.8
5.5
V
8
18
μA
2.25 2.6 MHz
I_VIN
I_FB
D_X
R_SW
t_SS
V_FB(MAX)
Pulse-Skipping Mode V_IN Quiescent Current
per Buck
Burst Mode^® V_IN Quiescent Current per Buck
Feedback Pin Input Current
Maximum Duty Cycle
SW Pull-Down Resistance
Soft-Start Rate
Maximum Feedback Voltage
V_FB(LSB)
V_FB(MIN)
Feedback LSB Step Size
Minimum Feedback Voltage
1.6A Step-Down Switching Regulator 1
V_FB = 0.85V (Note 5)
V_FB = 0.8V
V_FB = 0V
Regulators Disabled
(Note 6)
BxDTV1 = BxDTV2 = 11111,
V_IN = 2.7V to 5.5V
BxDTV1 = BxDTV2 = 00000,
V_IN = 2.7V to 5.5V
l
l
–50
100
l 0.735
120
200
μA
23
40
μA
50
nA
%
2.5
kΩ
0.8
V/ms
0.75 0.765
V
12.5
mV
l 0.351 0.3625 0.374
V
I_LIM1
Peak PMOS Current Limit SW1
RP1
R_DS(ON) of PMOS1
RN1
R_DS(ON) of NMOS1
1.0A/1.2A Step-Down Switching Regulators 2 and 3
I_SW1 = 100mA
I_SW1 = 100mA
l 2.0
2.7
A
180
mΩ
110
mΩ
I_{LIM2, 3}
Peak PMOS Current Limit SW2 and SW3 (LTC3589)
Peak PMOS Current Limit SW2 and SW3 (LTC3589-1/
LTC3589-2)
l 1.5
1.9
A
l 1.8
2.3
A
RP2, 3
R_DS(ON) of PMOS2 and PMOS3
RN2, 3
R_DS(ON) of NMOS2 and NMOS3
1.2A Buck-Boost Switching Regulator 4 (Buck-Boost)
250
mΩ
130
mΩ
I_VIN
V_{BB_FB}
V_OUTBB
I_LIM4
I_PEAK4
I_LIMR4
I_ZERO4
RP4
RN4
R_OUT4
t_SS
I_FB
PWM Mode V_IN Quiescent Current
Burst Mode V_IN Quiescent Current
Feedback Voltage
Output Voltage Range
Peak PMOS Current Limit SW4AB
Forward Burst Current Limit (Switch A)
Reverse Current Limit (Switch D)
Reverse Burst Current Limit (Switch D)
R_DS(ON) of Switch A and Switch D
R_DS(ON) of Switch B and Switch C
BB_OUT Pull-Down Resistance
Soft-Start Rate
Feedback Pin Input Current
V_{BB_FB} = 0.85V (Note 5)
V_IN = 2.7V to 5.5V, V_OUT = 5.5V
Burst Mode Operation
Burst Mode Operation
I_SW4AB = I_SW4CD = 100mA
I_SW4AB = I_SW4CD = –100mA
Regulator Disabled
(Note 6)
V_FB = 0.85V
l
l
l 0.776
1.8
l 2.3
–50
115
170
μA
19
35
μA
0.8 0.824
V
5.0
V
2.9
A
600
mA
1
A
0
mA
160
mΩ
110
mΩ
2.5
kΩ
2
V/ms
50
nA
3589fe
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