LTC1628-SYNC
PRODUCTIONHigh Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $7.81
Overview
- Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
- OPTI-LOOP® Compensation Minimizes COUT
- Dual N-Channel MOSFET Synchronous Drive
- ±1% Output Voltage Accuracy
- Power Good Output Voltage Monitor
- Phase-Lockable Fixed Frequency 150kHz to 300kHz
- Wide VIN Range: 3.5V to 36V Operation
- Very Low Dropout Operation: 99% Duty Cycle
- Adjustable Soft-Start Current Ramping
- Foldback Output Current Limiting
- Latched Short-Circuit Shutdown with Defeat Option
- Output Overvoltage Protection
- Remote Output Voltage Sense
- Low Shutdown IQ: 20µA
- 5V and 3.3V Standby Regulators
- Selectable Constant Frequency or Burst Mode® Operation
- Small 28-Lead SSOP Package
The LTC1628-SYNC is a high performance dual step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows phase-lockable frequency of up to 300kHz. Power loss and noise due to the ESR of the input capacitors are minimized by operating the two controller output stages out of phase.
OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference and power good output indicator are compatible with future microprocessor generations, and a wide 3.5V to 30V (36V maximum) input supply range encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when overcurrent latchoff is disabled. Output overvoltage protection circuitry latches on the bottom MOSFET until VOUT returns to normal. The FCB mode pin can select among Burst Mode, constant frequency mode and continuous inductor current mode or regulate a secondary winding.
Applications
- Notebook and Palmtop Computers, PDAs
- Telecom Systems
- Battery-Operated Digital Devices
- DC Power Distribution Systems
Documentation
Data Sheet 1
User Guide 1
Design Note 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC1628CG-SYNC#PBF | 28-Lead SSOP | ||
| LTC1628CG-SYNC#TRPBF | 28-Lead SSOP | ||
| LTC1628IG-SYNC#PBF | 28-Lead SSOP | ||
| LTC1628IG-SYNC#TRPBF | 28-Lead SSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG |
||
| LTC1628CG-SYNC#PBF | PRODUCTION | |
| LTC1628CG-SYNC#TRPBF | PRODUCTION | |
| LTC1628IG-SYNC#PBF | PRODUCTION | |
| LTC1628IG-SYNC#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice 1
Models for the following parts are available in LTspice:
- LTC1628
- LTC1628-PG
- LTC1628-SYNC
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
LTC1629CG LTC1628-SYNC | PolyPhase Dual Output High Current Power Supply, 5V to 14VIN, 1.6VOUT @ 52A Max., 2.5VOUT @ 15A Max (Thru-Hole Input Caps)
Resources
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