DocumentationDatasheet
Reliability Data
Press Release
cad_symbol
ltspice
Features
- Wide Input Range: 3.6V to 36V Operating, 40V Maximum
- Up to 1.2A Output Current
- Resistor-Programmable Fixed-Frequency Operation from 200kHz to 3MHz
- Output Adjustable Down to 780mV
- Short-Circuit Robust
- Uses Tiny Capacitors and Inductors
- Soft-Start
- Low Shutdown Current: <2µA
- Low VCESAT Switch: 350mV at 1A
- Thermally Enhanced, Low Profile 3mm x 3mm DFN-8 and MSOP-8 Packages
Typical Application
Description
The LT3505 is a current mode PWM step-down DC/DC converter with an internal 1.4A power switch. The wide operating input range of 3.6V to 36V (40V maximum) makes the LT3505 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. The oscillator can be programmed for high frequency operation allowing the use of tiny, low cost external components or it can be programmed for lower frequency operation to maximize efficiency.
Cycle-by-cycle current limit provides protection against shorted outputs and soft-start eliminates input current surge during start-up. The low current (<2µA) shutdown mode provides output disconnect, enabling easy power management in battery-powered systems.
3x3 DFN-8,MS-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT3505EDD#PBF | DFN | 8 | E | $3.43 | $2.40 |
| LT3505EDD#TRPBF | DFN | 8 | E | $2.46 | |
| LT3505EMS8E#PBF | MSOP | 8 | E | $3.71 | $2.60 |
| LT3505EMS8E#TRPBF | MSOP | 8 | E | $2.66 | |
| LT3505IDD#PBF | DFN | 8 | I | $4.11 | $2.88 |
| LT3505IDD#TRPBF | DFN | 8 | I | $2.94 | |
| LT3505IMS8E#PBF | MSOP | 8 | I | $4.40 | $3.08 |
| LT3505IMS8E#TRPBF | MSOP | 8 | I | $3.14 | |
| LT3505EDD | DFN | 8 | E | $6.86 | $4.80 |
| LT3505EDD#TR | DFN | 8 | E | $4.92 | |
| LT3505IDD | DFN | 8 | I | $8.22 | $5.76 |
| LT3505IDD#TR | DFN | 8 | I | $5.88 | |
| LT3505EMS8E | MSOP | 8 | E | $7.42 | $5.20 |
| LT3505EMS8E#TR | MSOP | 8 | E | $5.32 | |
| LT3505IMS8E | MSOP | 8 | I | $8.80 | $6.16 |
| LT3505IMS8E#TR | MSOP | 8 | I | $6.28 |
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 |
|---|---|---|---|
| DC1023A | LT3505EDD Demo Board | 6V ≤ VIN ≤ 36V, VOUT = 5V @ 1A | $100.00 | |
| DC1395A | LT3505 HV Buck regulator board with plug in interface | Contact Factory |