Datasheet

LTC3589/LTC3589-1/
LTC3589-2
4
3589ff
For more information www.linear.com/3589
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Operating Input Supply Voltage, V
IN
l
2.7 5.5 V
I
STANDBY
V
IN
Standby Current All Enables = 0V, PWR_ON = 0, I
LDO1
= 0
l
8 18 µA
f
OSC
Oscillator Frequency
l
1.8 2.25 2.6 MHz
Step-Down Switching Regulators 1, 2, and 3
I
VIN
Pulse-Skipping Mode V
IN
Quiescent Current
per Buck
Burst Mode
®
V
IN
Quiescent Current per Buck
V
FB
= 0.85V (Note 5)
l
l
120
23
200
40
µA
µA
I
FB
Feedback Pin Input Current V
FB
= 0.8V –50 50 nA
D
X
Maximum Duty Cycle V
FB
= 0V 100 %
R
SW
SW Pull-Down Resistance Regulators Disabled 2.5 kΩ
t
SS
Soft-Start Rate (Note 6) 0.8 V/ms
V
FB(MAX)
Maximum Feedback Voltage BxDT V1 = BxDTV2 = 11111,
V
IN
= 2.7V to 5.5V
l
0.735 0.75 0.765 V
V
FB(LSB)
Feedback LSB Step Size 12.5 mV
V
FB(MIN)
Minimum Feedback Voltage BxDTV1 = BxDTV2 = 00000,
V
IN
= 2.7V to 5.5V
l
0.351 0.3625 0.374 V
1.6A Step-Down Switching Regulator 1
I
LIM1
Peak PMOS Current Limit SW1
l
2.0 2.7 A
RP1 R
DS(ON)
of PMOS1 I
SW1
= 100mA 180 mΩ
RN1 R
DS(ON)
of NMOS1 I
SW1
= 100mA 110 mΩ
1.0A/1.2A Step-Down Switching Regulators 2 and 3
I
LIM2, 3
Peak PMOS Current Limit SW2 and SW3 (LTC3589)
Peak PMOS Current Limit SW2 and SW3 (LTC3589-1/
LTC3589-2)
l
l
1.5
1.8
1.9
2.3
A
A
RP2, 3 R
DS(ON)
of PMOS2 and PMOS3 250 mΩ
RN2, 3 R
DS(ON)
of NMOS2 and NMOS3 130 mΩ
1.2A Buck-Boost Switching Regulator 4 (Buck-Boost)
I
VIN
PWM Mode V
IN
Quiescent Current
Burst Mode V
IN
Quiescent Current
V
BB_FB
= 0.85V (Note 5)
l
l
115
19
170
35
µA
µA
V
BB_FB
Feedback Voltage V
IN
= 2.7V to 5.5V, V
OUT
= 5.5V
l
0.776 0.8 0.824 V
V
OUTBB
Output Voltage Range 1.8 5.0 V
I
LIM4
Peak PMOS Current Limit SW4AB
l
2.3 2.9 A
I
PEAK4
Forward Burst Current Limit (Switch A) Burst Mode Operation 600 mA
I
LIMR4
Reverse Current Limit (Switch D) 1 A
I
ZERO4
Reverse Burst Current Limit (Switch D) Burst Mode Operation 0 mA
RP4 R
DS(ON)
of Switch A and Switch D I
SW4AB
= I
SW4CD
= 100mA 160 mΩ
RN4 R
DS(ON)
of Switch B and Switch C I
SW4AB
= I
SW4CD
= –100mA 110 mΩ
R
OUT4
BB_OUT Pull-Down Resistance Regulator Disabled 2.5 kΩ
t
SS
Soft-Start Rate (Note 6) 2 V/ms
I
FB
Feedback Pin Input Current V
FB
= 0.85V –50 50 nA
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.