LTC3829 datasheet(5/40 Pages) LINER

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LTC3829

3829f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Nonlinear Fast Transit Mode

IFAST

Fast Transient Programmable Current VIFAST = 400mV

µA

AVP (Active Voltage Positioning)

ISINK

Sink Current of AVP Pin

SENSE+ = 1.2V

250

µA

ISOURCE

Source Current of AVP Pin

SENSE+ = 1.2V

VAVP-VO(MAX) Maximum Voltage Drop VAVP to VO

SENSE+ = 1.2V

180

VAVP

Maximum AVP Voltage

2.5

On-Chip Driver

TG RUP

TG Pull-Up RDS(ON)

TG High

2.6

TG RDOWN

TG Pull-Down RDS(ON)

TG Low

1.5

BG RUP

BG Pull-Up RDS(ON)

BG High

BG RDOWN

BG Pull-Down RDS(ON)

BG Low

1.1

elecTrical characTerisTics The

denotes the specifications which apply over the full operating

junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V, unless otherwise noted. (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 LTC3829E is guaranteed to meet performance specifications

from 0°C to 85°C operating junction temperature. Specifications over

the –40°C to 125°C operating junction temperature range are assured by

design, characterization and correlation with statistical process controls.

The LTC3829I is guaranteed to meet performance specifications over the

full –40°C to 125°C operating junction temperature range.

Note 3: TJ is calculated from the ambient temperature, TA, and power

dissipation, PD, according to the following formula:

LTC3829UHF: TJ = TA + (PD • 34°C/W)

LTC3829FE: TJ = TA + (PD • 25°C/W)

Note 4: The LTC3829 is tested in a feedback loop that servos VITH to a

specified voltage and measures the resultant VFB.

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

delivered at the switching frequency. See Applications Information.

Note 6: Rise and fall times are measured using 10% and 90% levels. Delay

times are measured using 50% levels.

Note 7: The minimum on-time condition corresponds to the on inductor

peak-to-peak ripple current ≥40% of IMAX (see Minimum On-Time

Considerations in the Applications Information section).

Note 8: Guaranteed by design.

LTC3829 Datasheet(PDF) 5 Page - Linear Technology

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