LTC3589-1 datasheet(8/38 Pages) LINER

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LTC3676/LTC3676-1

3676ff

For more information www.linear.com/LTC3676

Typical perForMance characTerisTics

Standby IVIN vs VIN

LDO2 to LDO4 IVIN vs VIN

Step-Down Switching Regulator

IVIN vs VIN

elecTrical characTerisTics

Note 3: The LTC3676 includes overtemperature protection that is intended

to protect the device during momentary overload conditions. Junction

temperature will exceed 150°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 4: Dropout voltage is defined as (VIN – VLDO1) for LDO1 or

(VIN_Lx – VLDOx) for other LDOs when VLDOx is 3% lower than VLDOx

measured with VIN = VIN_Lx = 4.3V.

VOLTAGE (V)

2.5

3676 G01

3.5

4.5

3.0

4.0

5.0

5.5

VOLTAGE (V)

2.5

100

300

400

500

4.5

900

3676 G03

200

3.5

3.0

5.0

4.0

5.5

600

700

800

PULSE-SKIPPING MODE

ENABLE FOUR BUCKS

ENABLE THREE BUCKS

ENABLE TWO BUCKS

ENABLE ONE BUCK

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 6: Soft-Start measured in test mode with regulator error amplifier in

unity-gain mode.

Note 7: The switching regulator PMOS and NMOS on-resistance is

guaranteed by correlation to wafer level measurements.

Step-Down Switching Regulator

IVIN vs VIN

Input Supply Current

vs Temperature

Oscillator Frequency

vs Temperature

VOLTAGE (V)

2.5

100

4.5

180

3676 G04

3.5

3.0

5.0

4.0

5.5

120

140

160

Burst Mode OPERATION

ENABLE FOUR BUCKS

ENABLE THREE BUCKS

ENABLE TWO BUCKS

ENABLE ONE BUCK

VIN = 3.8V, TA = 25°C unless otherwise noted

VIN (V)

2.50

100

150

3676 G02

3.50

4.50

5.50

250

200

ENABLE 3 LDOs

ENABLE 2 LDOs

ENABLE 1 LDO

TEMPERATURE (°C)

–50

200

400

600

800

1000

1200

PULSE-SKIPPING

STANDBY

Burst Mode OPERATION

100

150

3676 G05

ALL REGULATORS ENABLED

TEMPERATURE (°C)

–50

2.00

2.05

2.10

2.15

2.20

2.25

2.30

100

150

3676 G06

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