LTC1704
550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller
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Overview
Features and Benefits
- Dual Regulated Outputs: One Switching Regulator and One Linear Regulator
- Excellent DC Accuracy: ±1.5% for Switcher and ±2% for Linear Regulator
- External N-Channel MOSFET Architecture
- No External Current Sense Resistor Required
- Burst Mode® Operation at Light Load (LTC1704)
- Continuous Switching at Light Load (LTC1704B)
- Linear Regulator with Programmable Current Limit
- Linear Regulator with Programmable Start-Up Delay
- Low Shutdown Current: <150µA
- High Efficiency Over Wide Load Current Range
- PGOOD Flag Monitors Both Outputs
- Small 16-Pin Narrow SSOP Package
Product Details
The LTC1704/LTC1704B include a high power synchronous switching regulator controller plus a linear regulator controller. The switching regulator controller is designed to drive a pair of N-channel MOSFETs in a voltage mode, synchronous buck configuration to provide the main supply. The constant frequency, true PWM architecture switches at 550kHz, minimizing external component size, cost and optimizing load transient performance. The LTC1704 features automatic transition to power saving Burst Mode operation at light loads. The LTC1704B does not shift into Burst Mode operation at light loads, eliminating low frequency output ripple at the expense of light load efficiency. The linear regulator controller is designed to drive an external NPN power transistor to provide up to 2A of current to an auxiliary load.
The LTC1704/LTC1704B deliver better than ±1.5% DC accuracy at the switcher outputs and ±2% at the linear regulator outputs. High performance feedback loops allow the circuit to keep total output regulation within ±5% under all transient conditions. An open-drain PGOOD output indicates when both outputs are within ±10% of their regulated values.
Applications
- Multiple Logic Supply Generator
- Distributed Power Applications
- High Efficiency Power Conversion
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (2)
Documentation & Resources
-
R384 Reliability Data3/26/2018PDF18 K
-
DC357A - Demo Manual9/24/2009PDF329K
-
DN311 - Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs3/21/2014PDF76K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC1704BEGN#PBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC1704BEGN#TRPBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC1704EGN#PBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| LTC1704EGN#TRPBF | Material Declaration | Reliability Data | 16-Lead SSOP (Narrow 0.15 Inch) | |
| Wafer Fabrication Data | R384 Reliability Data |
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