Beschreibung:

The LTC3824 is a step-down DC/DC controller designed to drive an external P-channel MOSFET. With a wide input range of 4V to 60V and a high voltage gate driver, the LTC3824 is suitable for many industrial and automotive high power applications. Constant frequency current mode operation provides excellent performance.

The LTC3824 can be configured for Burst Mode operation. Burst Mode operation enhances low current efficiency (only 40µA quiescent current) and extends battery run time. The switching frequency can be programmed up to 600kHz and is easily synchronizable.

Other features include current limit, soft-start, micropower shutdown, and Burst Mode disable.

The LTC3824 is available in a 10-lead MSE power package.

 

Eigenschaften：

Wide Input Range: 4V to 60V
Current Mode Constant Frequency PWM
Very Low Dropout Operation: 100% Duty Cycle
Programmable Switching Frequency: 200kHz to 600kHz
Selectable High Efficient Burst Mode® Operation: 40µA Quiescent Current
Easy Synchronization
8V, 2A Gate Drive (VCC > 10V) for Industrial High Voltage P-Channel MOSFET
Programmable Soft-Start
Programmable Current Limit
Available in a Small 10-Pin Thermally Enhanced MSE Package

 

Anwendungen:

Industrial and Automotive Power Supplies
Telecom Power Supplies
Distributed Power Systems

 

Same series order information

LTC3824EMSE#PBF LTC3824EMSE#TRPBF LTBRZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824IMSE#PBF LTC3824IMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824HMSE#PBF LTC3824HMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –40°C to 150°C

LTC3824MPMSE#PBF LTC3824MPMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –55°C to 150°C

LTC3824EMSE LTC3824EMSE#TR LTBRZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824IMSE LTC3824IMSE#TR LTCGZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824HMSE LTC3824HMSE#TR LTCGZ 10-Lead Plastic MSOP –40°C to 150°C

LTC3824MPMSE LTC3824MPMSE#TR LTCGZ 10-Lead Plastic MSOP –55°C to 150°C

LTC3824EMSE#PBF LTC3824EMSE#TRPBF LTBRZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824IMSE#PBF LTC3824IMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824HMSE#PBF LTC3824HMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –40°C to 150°C

LTC3824MPMSE#PBF LTC3824MPMSE#TRPBF LTCGZ 10-Lead Plastic MSOP –55°C to 150°C

LTC3824EMSE LTC3824EMSE#TR LTBRZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824IMSE LTC3824IMSE#TR LTCGZ 10-Lead Plastic MSOP –40°C to 125°C

LTC3824HMSE LTC3824HMSE#TR LTCGZ 10-Lead Plastic MSOP –40°C to 150°C

LTC3824MPMSE LTC3824MPMSE#TR LTCGZ 10-Lead Plastic MSOP –55°C to 150°C

 

Electrical Characteristics

The denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VCC = 12V, RSET = 392k, CCAP = 0.1µF. No load on any outputs, unless otherwise specified.

Note：

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.

The LTC3824 is tested under pulsed load conditions such that TJ ≈ TA. The LTC3824E 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 LTC3824I is guaranteed over the –40°C to 125°C operating junction temperature range. The LTC3824H is guaranteed over the –40°C to 150°C operating junction temperature range. The LTC3824MP is guaranteed and tested over the full –55°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes; operating lifetime is derated for junction temperatures greater than 125°C. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with boardlayout, the rated package thermal impedance and other environmental factors. The junction temperature (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and power dissipation (PD, in Watts) according to the formula: TJ = TA + (PD • θJA) where θJA (in °C/W) is the package junction to ambient thermal impedance.

This parameter is tested in a feedback loop that servos VFB to the reference voltage with the VC pin forced to 1V.

This specification represents the maximum voltage on VC where switching (GATE pin) is guaranteed to be off. The nominal value of VC where switching turns off is 0.7V.

The LTC3824 typically enters Burst Mode operation when the load is less than one third the current limit. If minimum on-time is violated, cycle skipping may occur at higher current levels.