LTC1504 - 500mA Low Voltage Step-Down Synchronous Switching Regulator
Datasheet 
DocumentationDatasheet
Application Note
- AN84 - Linear Technology Magazine Circuit Collection, Volume IV
- AN90 - Current Sources for Fiber Optic Lasers: A Compendium of Pleasant Current Events
Design Note
Reliability Data
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Features
- 500mA Output Current at 3.3V Output
- Up to 92% Peak Efficiency
- Internal Reference Trimmed to 1%
- Output Can Source or Sink Current
- Requires as Few as Four External Components
- Input Voltage Range: 4V to 10V
- Adjustable Current Limit
- Small SO-8 Package
- 200kHz Switching Frequency Can be Synchronized Up to 500kHz
Typical Application
Description
The LTC1504 is a self-contained, high efficiency synchronous buck switching regulator. It includes a pair of on-chip 1.5 ohms power switches, enabling it to supply up to 500mA of load current. Efficiency peaks at 92%, minimizing heat and wasted power. The synchronous buck architecture allows the output to source or sink current as required to keep the output voltage in regulation.The LTC1504 is available in adjustable and fixed 3.3V output versions. An adjustable current limit circuit provides protection from overloads. The internal 1% reference combined with a sophisticated voltage feedback loop provides optimum output voltage accuracy and fast load transient response. The LTC1504 is specified to operate with input voltages between 4V and 10V. Contact the LTC factory for guaranteed specifications at 2.7V supply.
The LTC1504 is available in a plastic SO-8 package.
SO-8
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC1504ACS8#PBF | SO | 8 | C | $2.85 | $2.40 |
| LTC1504ACS8#TRPBF | SO | 8 | C | $2.46 | |
| LTC1504ACS8-3.3#PBF | SO | 8 | C | $2.85 | $2.40 |
| LTC1504ACS8-3.3#TRPBF | SO | 8 | C | $2.46 | |
| LTC1504AIS8#PBF | SO | 8 | I | $3.15 | $2.65 |
| LTC1504AIS8#TRPBF | SO | 8 | I | $2.71 | |
| LTC1504AIS8-3.3#PBF | SO | 8 | I | $3.15 | $2.65 |
| LTC1504AIS8-3.3#TRPBF | SO | 8 | I | $2.71 | |
| LTC1504CS8#PBF | SO | 8 | C | $2.80 | $2.40 |
| LTC1504CS8#TRPBF | SO | 8 | C | $2.46 | |
| LTC1504CS8-3.3#PBF | SO | 8 | C | $2.80 | $2.40 |
| LTC1504CS8-3.3#TRPBF | SO | 8 | C | $2.46 | |
| LTC1504IS8#PBF | SO | 8 | I | $3.10 | $2.65 |
| LTC1504IS8#TRPBF | SO | 8 | I | $2.71 | |
| LTC1504IS8-3.3#PBF | SO | 8 | I | $3.10 | $2.65 |
| LTC1504IS8-3.3#TRPBF | SO | 8 | I | $2.71 | |
| LTC1504ACS8 | SO | 8 | C | $5.70 | $4.80 |
| LTC1504ACS8#TR | SO | 8 | C | $4.92 | |
| LTC1504ACS8-3.3 | SO | 8 | C | $5.70 | $4.80 |
| LTC1504ACS8-3.3#TR | SO | 8 | C | $4.92 | |
| LTC1504AIS8 | SO | 8 | I | $6.30 | $5.30 |
| LTC1504AIS8#TR | SO | 8 | I | $5.42 | |
| LTC1504AIS8-3.3 | SO | 8 | I | $6.30 | $5.30 |
| LTC1504AIS8-3.3#TR | SO | 8 | I | $5.42 | |
| LTC1504CS8 | SO | 8 | C | $5.60 | $4.80 |
| LTC1504CS8#TR | SO | 8 | C | $4.92 | |
| LTC1504CS8-3.3 | SO | 8 | C | $5.60 | $4.80 |
| LTC1504CS8-3.3#TR | SO | 8 | C | $4.92 | |
| LTC1504IS8 | SO | 8 | I | $6.20 | $5.30 |
| LTC1504IS8#TR | SO | 8 | I | $5.42 | |
| LTC1504IS8-3.3 | SO | 8 | I | $6.20 | $5.30 |
| LTC1504IS8-3.3#TR | SO | 8 | I | $5.42 |
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 |
|---|---|---|---|
| DC205A | LTC1504CS8 | 3 Circuits, Hi Performance, Low Profile, Low Cost, 500mA Step-Down Sw. Reg., 5Vin, 2.85Vout, 2 x 3.3Vout | Contact Factory |