DocumentationDatasheet
Application Note
Design Note
Reliability Data
cad_symbol
Features
- High Voltage: Operation Up to 60V
- High Current: Dual N-Channel Synchronous Drive
Handles Up to 10,000pF Gate Capacitance - Programmable Average Load Current Limiting
- 5V Reference Output with 10mA External
Loading Capability - Programmable Fixed Frequency Synchronizable
Current Mode Operation Up to 150kHz - Undervoltage Lockout with Hysteresis
- Programmable Start Inhibit for Power Supply
Sequencing and Protection - Adaptive Nonoverlapping Gate Drive Prevents
Shoot-Through
Typical Application
Description
The LT1339 is a high power synchronous current mode switching regulator controller. The IC drives dual N-channel MOSFETs to create a single IC solution for high power DC/DC converters in applications up to 60V.
The LT1339 incorporates programmable average current limiting, allowing accurate limiting of DC load current independent of inductor ripple current. The IC also incorporates user-adjustable slope compensation for minimization of magnetics at duty cycles up to 90%.
The LT1339 timing oscillator operating frequency is programmable and can be synchronized up to 150kHz. Minimum off-time operation provides main switch protection. The IC also incorporates a soft start feature that is gated by both shutdown and undervoltage lockout conditions.
An output phase reversal pin allows flexibility in configuration of converter types, including inverting and negative topologies.
N-20,SW-20
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1339CN#PBF | PDIP | 20 | C | $6.10 | $4.85 |
| LT1339CSW#PBF | SO | 20 | C | $6.25 | $5.00 |
| LT1339CSW#TRPBF | SO | 20 | C | $5.10 | |
| LT1339IN#PBF | PDIP | 20 | I | $7.35 | $5.85 |
| LT1339ISW#PBF | SO | 20 | I | $7.50 | $6.00 |
| LT1339ISW#TRPBF | SO | 20 | I | $6.10 | |
| LT1339CN | PDIP | 20 | C | $12.20 | $9.70 |
| LT1339CSW | SO | 20 | C | $12.50 | $10.00 |
| LT1339CSW#TR | SO | 20 | C | $10.20 | |
| LT1339IN | PDIP | 20 | I | $14.70 | $11.70 |
| LT1339ISW | SO | 20 | I | $15.00 | $12.00 |
| LT1339ISW#TR | SO | 20 | I | $12.20 |
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 |
|---|---|---|---|
| DC147A-B | LT1339CN | HIGH POWER SYNCHRONOUS DC/DC CONVERTER 48V IN TO 5V OUT @ 20A | Contact Factory | |
| DC147A-C | LT1339CN Demo Board | Sync Buck, 48V Input to 12V OUT @ 50A | Contact Factory | |
| DC147A-D | LT1339CN | HIGH POWER SYNCHRONOUS DC/DC CONVERTER 48V IN TO 12V OUT @ 20A | Contact Factory | |
| DC177A | LT1339CN | SYNCHRONOUS DC/DC HIGH POWER CONTROLLER, 28Vin to 5Vout @ 50A | Contact Factory | |
| DC224A | LT1339CSW / LT1082CQ | Buck Controller, 4.5V to 60Vin, 3.3V/5V/7V/ 12Vout @ 3Amp (thru-hole caps) | Contact Factory | |
| DC244A | LT1339, LT1373,LT1431 | 32Vin to 12Vout @ 15A, -5Vout @ 100mA | Contact Factory | |
| DC259A | LT1339, LTC1693, LT1431 Isolated Demo Board | Telecom Module, 36 to 72Vin, 5V or 3.3Vout @ 10A | Contact Factory |