LTC3589-1 datasheet(4/38 Pages) LINER

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LTC3676/LTC3676-1

3676ff

For more information www.linear.com/LTC3676

elecTrical characTerisTics The

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_L2 = VIN_L3 =

VIN_L4 = DVDD = 3.8V. All regulators disabled unless otherwise noted.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Input Supply Voltage, VIN

2.7

5.5

VIN Standby Current

PWR_ON = 0V

µA

Step-Down Switching Regulators 1, 2, 3 and 4

Output Voltage Range

VFB

PVIN

Burst Mode® VIN Quiescent Current

Pulse-Skipping Mode VIN Quiescent Current

Forced Continuous VIN Quiescent Current

VFB = 850mV (Note 5)

VFB = 0V (Note 5)

120

170

200

300

µA

Feedback Pin Input Current

VFB = 850mV

–0.05

0.05

µA

Maximum Duty Cycle

VFB = 0V

100

SW Pull-Down Resistance

Regulator Disabled

625

Feedback Reference Soft-Start Rate

(Note 6)

0.8

V/ms

High Feedback Regulation Voltage (VFB)

DVBxA[4:0] = DVBxB[4:0] = 11111,

VIN = 2.7V to 5.5V

788

800

812

Default Feedback Regulation Voltage (VFB)

DVBxA[4:0] = DVBxB[4:0] = 11001,

VIN = 2.7V to 5.5V

714

725

736

Low Feedback Regulation Voltage (VFB)

DVBxA[4:0] = DVBxB[4:0] = 00000,

VIN = 2.7V to 5.5V

404

412.5

421

Feedback LSB Step Size

12.5

Switching Frequency

BUCKx[2] = 0

BUCKx[2] = 1

1.7

0.85

2.25

1.125

2.7

1.35

MHz

1.5A Step-Down Switching Regulators 1 and 2

PMOS Current Limit

PMOS On-Resistance (Note 7)

160

mΩ

NMOS On-Resistance (Note 7)

mΩ

2.5A Step-Down Switching Regulators 3 and 4

PMOS Current Limit

3.0

PMOS On-Resistance (Note 7)

120

mΩ

NMOS On-Resistance (Note 7)

mΩ

Step-Down Switching Regulator 1 and VTTR (LTC3676-1)

Buck 1 Feedback Regulation Voltage

VDDQIN = 1.5V

VTTR – 10

VTTR

VTTR + 10

VTTR Output Voltage

VDDQIN = 1.5V

0.49•VDDQIN 0.5•VDDQIN 0.51•VDDQIN

VTTR Maximum Output Current

–10

IVIN VTTR Enabled

LDO Regulators 2, 3 and 4

Feedback Reference Soft-Start Rate

V/ms

Output Pull-Down Resistance

Regulator Disabled

625

LDO Regulator 1

Output Voltage Range

VFB_L1

VIN

Feedback Regulation Voltage (VFB_L1)

689

725

761

Line Regulation

ILDO1 = 1mA, VLDO1 = 1.2V,

VIN = 2.7V to 5.5V

0.15

%/V

Load Regulation

ILDO1 = 0.1mA to 25mA,

VLDO1 = 3.3V

0.1

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