Datasheet LTC3829 (Analog Devices) - 5

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ELECTRICAL CHARACTERISTICS The
l
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) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Nonlinear Fast Transit Mode
IFAST Fast Transient Programmable Current VIFAST = 400mV 9 10 11 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 2 mA VAVP-VO(MAX) Maximum Voltage Drop VAVP to VO SENSE+ = 1.2V 180 mV VAVP Maximum AVP Voltage l 2.5 V
On-Chip Driver
TG RUP TG Pull-Up RDS(ON) TG High 2.6 Ω TG RDOWN TG Pull-Down RDS(ON) TG Low 1.5 Ω BG RUP BG Pull-Up RDS(ON) BG High 4 Ω BG RDOWN BG Pull-Down RDS(ON) BG Low 1.1 Ω
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 4:
The LTC3829 is tested in a feedback loop that servos VITH to a may cause permanent damage to the device. Exposure to any Absolute specified voltage and measures the resultant VFB. Maximum Rating condition for extended periods may affect device
Note 5:
Dynamic supply current is higher due to the gate charge being reliability and lifetime. delivered at the switching frequency. See Applications Information.
Note 2:
The LTC3829 is tested under pulsed load conditions such that
Note 6:
Rise and fall times are measured using 10% and 90% levels. Delay TJ ≈ TA. The LTC3829E is guaranteed to meet performance specifications times are measured using 50% levels. from 0°C to 85°C operating junction temperature. Specifications over
Note 7:
The minimum on-time condition corresponds to the on inductor the –40°C to 125°C operating junction temperature range are assured by peak-to-peak ripple current ≥40% of I design, characterization and correlation with statistical process controls. MAX (see Minimum On-Time Considerations in the Applications Information section). The LTC3829I is guaranteed to meet performance specifications over the full –40°C to 125°C operating junction temperature range.
Note 8:
Guaranteed by design.
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)
TYPICAL PERFORMANCE CHARACTERISTICS Load Step-Up (0A to 75A, 75A/µs) Load Step-Up (0A to 75A, 75A/µs) (Nonlinear Operation) (Normal Operation)
VOUT V 100mV/DIV OUT 100mV/DIV AC-COUPLED 75mV AC-COUPLED 95mV VSW1 V 10V/DIV SW1 10V/DIV VSW2 VSW2 10V/DIV 10V/DIV VSW3 VSW3 10V/DIV 10V/DIV 2µs/DIV 3829 G01 2µs/DIV 3829 G02 Rev. E For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Diagram Operation Applications Information Typical Application Package Description Revision History Typical Application Related Parts