DocumentationDatasheet
Design Note
- DN191 - The LT1776 Provides Power for the IEEE1394 Fire Wire
- DN202 - 60V, High Efficiency Buck Switching Regulators in SO-8
Reliability Data
LT Journal
cad_symbol
Features
- Wide Input Range: 7.4V to 40V
- Tolerates Input Transients to 60V
- 700mA Peak Switch Rating
- Adaptive Switch Drive Maintains Efficiency at High Load Without Pulse Skipping at Light Load
- True Current Mode Control
- 200kHz Fixed Operating Frequency
- Synchronizable to 400kHz
- Low Supply Current in Shutdown: 30µA
- Available in 8-Pin SO and PDIP Packages
Typical Application
Description
The LT1776 is a wide input range, high efficiency Buck (step-down) switching regulator. The monolithic die includes all oscillator, control and protection circuitry. The part can accept input voltages as high as 60V and contains an output switch rated at 700mA peak current. Current mode control delivers excellent dynamic input supply rejection and short-circuit protection.The LT1776 contains several features to enhance efficiency. The internal control circuitry is normally powered via the VCC pin, thereby minimizing power drawn directly from the VIN supply (see Applications Information). The action of the LT1776 switch circuitry is also load dependent. At medium to high loads, the output switch circuitry maintains fast rise time for good efficiency. At light loads, rise time is deliberately reduced to avoid pulse skipping behavior.
The available SO-8 package and 200kHz switching frequency allow for minimal PC board area requirements.
N-8,SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LT1776CN8#PBF | PDIP | 8 | C | $3.05 | $2.50 |
| LT1776CS8#PBF | SO | 8 | C | $3.15 | $2.60 |
| LT1776CS8#TRPBF | SO | 8 | C | $2.66 | |
| LT1776IN8#PBF | PDIP | 8 | I | $3.55 | $2.85 |
| LT1776IS8#PBF | SO | 8 | I | $3.60 | $3.00 |
| LT1776IS8#TRPBF | SO | 8 | I | $3.06 | |
| LT1776CN8 | PDIP | 8 | C | $6.10 | $5.00 |
| LT1776CS8 | SO | 8 | C | $6.30 | $5.20 |
| LT1776CS8#TR | SO | 8 | C | $5.32 | |
| LT1776IN8 | PDIP | 8 | I | $7.10 | $5.70 |
| LT1776IS8 | SO | 8 | I | $7.20 | $6.00 |
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 |
|---|---|---|---|
| DC204A-B | LT1776CS8 | High Voltage, High Eff., Step Down Switching Regulator, 7V to 60Vin, 3.3V and 5V @ 0.5A Out (thru-hole input cap) | $75.00 |