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- LTC3864 Demo Circuit - 24V Output Automotive Step-Down Converter (24-60V to 24V @ 1A)
- LTC3864 Demo Circuit - 5V Output Automotive Step-Down Converter (5.2-55V to 5V @ 2A)
- LTC3864 Demo Circuit - 60W PMOS Step-Down Converter with 100% Duty Cycle Capability (12-60V to 12V @ 5A)
LTpowerCAD
Features
- Wide Operating VIN Range: 3.5V to 60V
- Wide VOUT Range: 0.8V to VIN
- Low Operating IQ = 40μA
- Very Low Dropout Operation: 100% Duty Cycle
- Strong High Voltage MOSFET Gate Driver
- Constant Frequency Current Mode Architecture
- Verified FMEA for Adjacent Pin Open/Short
- Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads
- Programmable Fixed Frequency: 50kHz to 850kHz
- Phase-Lockable Frequency: 75kHz to 750kHz
- Accurate Current Limit
- Programmable Soft-Start or Voltage Tracking
- Internal Soft-Start Guarantees Smooth Start-Up
- Power Good Output Voltage Monitor
- Low Shutdown IQ = 7μA
- Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages
Typical Application
Description
The LTC®3864 is a robust, high voltage step-down DC/DC controller optimized for automotive and industrial applications. It drives a P-channel power MOSFET switch allowing 100% duty cycle operation. The wide input and output voltage ranges cover a multitude of applications. This device has been verified with the failure mode and effects analysis (FMEA) procedure for operation during failure conditions.
The LTC3864 offers excellent light load efficiency, drawing only 40μA quiescent current in a user programmable Burst Mode operation. Its peak current mode, constant frequency PWM architecture provides for good control of switching frequency and output current limit. The switching frequency can be programmed from 50kHz to 850kHz with an external resistor and can be synchronized to an external clock from 75kHz to 750kHz.
The LTC3864 offers programmable soft-start or output tracking. Safety features include overvoltage protection, overcurrent and short-circuit protection including frequency foldback and a power good output signal.
The LTC3864 is available in thermally enhanced 12-Pin MSOP and 3mm × 4mm DFN packages.
4x3 DFN-12,MS-12E
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC3864EDE#PBF | DFN | 12 | E | $2.94 | $2.06 |
| LTC3864EDE#TRPBF | DFN | 12 | E | $2.12 | |
| LTC3864EMSE#PBF | MSOP | 12 | E | $2.94 | $2.06 |
| LTC3864EMSE#TRPBF | MSOP | 12 | E | $2.12 | |
| LTC3864HDE#PBF | DFN | 12 | H | $3.90 | $2.73 |
| LTC3864HDE#TRPBF | DFN | 12 | H | $2.79 | |
| LTC3864HMSE#PBF | MSOP | 12 | H | $3.90 | $2.73 |
| LTC3864HMSE#TRPBF | MSOP | 12 | H | $2.79 | |
| LTC3864IDE#PBF | DFN | 12 | I | $3.49 | $2.44 |
| LTC3864IDE#TRPBF | DFN | 12 | I | $2.50 | |
| LTC3864IMSE#PBF | MSOP | 12 | I | $3.49 | $2.44 |
| LTC3864IMSE#TRPBF | MSOP | 12 | I | $2.50 | |
| LTC3864MPDE#PBF | DFN | 12 | MP | $9.40 | $6.58 |
| LTC3864MPDE#TRPBF | DFN | 12 | MP | $6.64 | |
| LTC3864MPMSE#PBF | MSOP | 12 | MP | $9.40 | $6.58 |
| LTC3864MPMSE#TRPBF | MSOP | 12 | MP | $6.64 |
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1722A | LTC3864EMSE Demo Board | 5.5V ≤ VIN ≤ 55V; VOUT = 5V @ 2A | $100.00 | |
| DC2434A | LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, Vout = 12V @ 5A | Contact Factory |