LTC3589 datasheet(4/50 Pages) LINER

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LTC3589/LTC3589-1/

LTC3589-2

3589fe

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VIN

Operating Input Supply Voltage, VIN

2.7

5.5

ISTANDBY

VIN Standby Current

All Enables = 0V, PWR_ON = 0, ILDO1 = 0

818

μA

fOSC

Oscillator Frequency

1.8

2.25

2.6

MHz

Step-Down Switching Regulators 1, 2, and 3

IVIN

Pulse-Skipping Mode VIN Quiescent Current

per Buck

Burst Mode® VIN Quiescent Current per Buck

VFB = 0.85V (Note 5)

120

200

μA

IFB

Feedback Pin Input Current

VFB = 0.8V

–50

Maximum Duty Cycle

VFB = 0V

100

RSW

SW Pull-Down Resistance

Regulators Disabled

2.5

kΩ

tSS

Soft-Start Rate

(Note 6)

0.8

V/ms

VFB(MAX)

Maximum Feedback Voltage

BxDTV1 = BxDTV2 = 11111,

VIN = 2.7V to 5.5V

0.735

0.75

0.765

VFB(LSB)

Feedback LSB Step Size

12.5

VFB(MIN)

Minimum Feedback Voltage

BxDTV1 = BxDTV2 = 00000,

VIN = 2.7V to 5.5V

0.351

0.3625

0.374

1.6A Step-Down Switching Regulator 1

ILIM1

Peak PMOS Current Limit SW1

2.0

2.7

RP1

RDS(ON) of PMOS1

ISW1 = 100mA

180

mΩ

RN1

RDS(ON) of NMOS1

ISW1 = 100mA

110

mΩ

1.0A/1.2A Step-Down Switching Regulators 2 and 3

ILIM2, 3

Peak PMOS Current Limit SW2 and SW3 (LTC3589)

Peak PMOS Current Limit SW2 and SW3 (LTC3589-1/

LTC3589-2)

1.5

1.8

1.9

2.3

RP2, 3

RDS(ON) of PMOS2 and PMOS3

250

mΩ

RN2, 3

RDS(ON) of NMOS2 and NMOS3

130

mΩ

1.2A Buck-Boost Switching Regulator 4 (Buck-Boost)

IVIN

PWM Mode VIN Quiescent Current

Burst Mode VIN Quiescent Current

VBB_FB = 0.85V (Note 5)

115

170

μA

VBB_FB

Feedback Voltage

VIN = 2.7V to 5.5V, VOUT = 5.5V

0.776

0.8

0.824

VOUTBB

Output Voltage Range

1.8

5.0

ILIM4

Peak PMOS Current Limit SW4AB

2.3

2.9

IPEAK4

Forward Burst Current Limit (Switch A)

Burst Mode Operation

600

ILIMR4

Reverse Current Limit (Switch D)

IZERO4

Reverse Burst Current Limit (Switch D)

Burst Mode Operation

RP4

RDS(ON) of Switch A and Switch D

ISW4AB = ISW4CD = 100mA

160

mΩ

RN4

RDS(ON) of Switch B and Switch C

ISW4AB = ISW4CD = –100mA

110

mΩ

ROUT4

BB_OUT Pull-Down Resistance

Regulator Disabled

2.5

kΩ

tSS

Soft-Start Rate

(Note 6)

V/ms

IFB

Feedback Pin Input Current

VFB = 0.85V

–50

The

l denotes the specifications which apply over the specified operating

junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = PVIN1 = PVIN2 = PVIN3 = PVIN4 = VIN_LDO2 = VIN_LDO34

= DVDD = 3.8V. All regulators disabled unless otherwise noted.

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