LTC3417AEFE datasheet(3/20 Pages) LINER

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LTC3417A

3417afa

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Half Active Mode (VRUN2 = 0V, 1.5A Only)

VFB1 = 0.75V, VSYNC/MODE = VIN, VRUN1 = VIN

260

400

µA

Half Active Mode (VRUN1 = 0V, 1A Only)

VFB2 = 0.75V, VSYNC/MODE = VIN, VRUN2 = VIN

260

400

µA

Both Channels in Sleep Mode

VFB1 = VFB2 = 1V, VSYNC/MODE = VIN,

125

250

µA

VRUN1 = VRUN2 = VIN

Shutdown

VRUN1 = VRUN2 = 0V

0.1

µA

fOSC

Oscillator Frequency

VFREQ = VIN

1.2

1.5

1.8

MHz

VFREQ: RT = 143k

0.85

1.25

MHz

VFREQ: Resistor (Note 6)

MHz

ILIM1

Peak Switch Current Limit on SW1 (1.5A)

2.1

2.5

ILIM2

Peak Switch Current Limit on SW2 (1A)

1.4

1.7

RDS(ON)1

SW1 Top Switch On-Resistance (1.5A)

VIN1 = 3.6V (Note 5)

0.088

Ω

SW1 Bottom Switch On-Resistance

VIN1 = 3.6V (Note 5)

0.084

Ω

RDS(ON)2

SW2 Top Switch On-Resistance (1A)

VIN2 = 3.6V (Note 5)

0.16

Ω

SW2 Bottom Switch On-Resistance

VIN2 = 3.6V (Note 5)

0.15

Ω

ISW1(LKG)

Switch Leakage Current SW1 (1.5A)

VIN1 = 6V, VITH1 = 0V, VRUN1 = 0V

0.01

µA

ISW2(LKG)

Switch Leakage Current SW2 (1A)

VIN2 = 6V, VITH2 = 0V, VRUN2 = 0V

0.01

µA

VUVLO

Undervoltage Lockout Threshold

VIN1, VIN2 Ramping Down

1.9

2.07

2.2

VIN1, VIN2 Ramping Up

1.95

2.12

2.25

TPGOOD

Threshold for Power Good. Percentage

VFB1 or VFB2 Ramping Up, VSYNC/MODE = 0V

–6

Deviation from VFB Steady State

VFB1 or VFB2 Ramping Down,

–6

(Typically 0.8V)

VSYNC/MODE = 0V

RPGOOD

Power Good Pull-Down On-Resistance

160

300

Ω

VRUN1, VRUN2 RUN1, RUN2 Threshold

0.3

0.85

1.5

VPHASE

PHASE Threshold High-CMOS Levels

VIN –0.5

PHASE Threshold Low-CMOS Levels

0.5

IRUN1, IRUN2,

RUN1, RUN2, PHASE and SYNC/MODE

VIN = 6V, PVIN = 3V

0.01

µA

IPHASE,

Leakage Current

ISYNC/MODE

VTLSYNC/MODE SYNC/MODE Threshold Voltage Low

0.5

VTHSYNC/MODE SYNC/MODE Threshold Voltage High

VIN –0.5

VTHFREQ

FREQ Threshold Voltage High

VIN –0.5

The

● denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C.

VIN = 3.6V unless otherwise specified. (Note 2)

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC3417AE is guaranteed to meet specified performance from

0°C to 85°C. Specifications over the –40°C to 85°C operating ambient

temperature range are assured by design, characterization and correlation

with statistical process controls. The LTC3417AI is guaranteed to meet

performance specifications over the –40°C to 85°C operating temperature

range.

Note 3: The LTC3417A is tested in feedback loop which servos VFB1 to the

midpoint for the error amplifier (VITH1 = 0.6V) and VFB2 to the midpoint for

the error amplifier (VITH2 = 0.6V).

Note 4: Total supply current is higher due to the internal gate charge being

delivered at the switching frequency.

Note 5: Switch on-resistance is guaranteed by design and test correlation

on the DHC package and by final test correlation on the FE package.

Note 6: Variable frequency operation with resistor is guaranteed by design

but not production tested and is subject to duty cycle limitations.

Note 7: This IC includes overtemperature protection that is intended to

protect the device during momentary overload conditions. Junction

temperature will exceed 125°C when overtemperature protection is active.

Continuous operation above the specified maximum operating junction

temperature may impair device reliability.

Note 8: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, according to the following formula:

LTC3417AEDHC: TJ = TA + (PD • 43°C/W)

LTC3417AEFE: TJ = TA + (PD • 38°C/W)

ELECTRICAL CHARACTERISTICS

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