LTC1628
PRODUCTIONHigh Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
- Part Models
- 12
- 1ku List Price
- Starting From $7.09
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 (LTC1628-PG)
- DC Programmed 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
- Small 28-Lead SSOP Package
- Selectable Constant Frequency or Burst Mode® Operation
- Available in 5mm × 5mm QFN and 28-Pin SSOP Packages
The LTC1628/LTC1628-PG are high performance dual step-down switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows adjustment of the frequency 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. The LTC1628-PG includes a power good output pin that replaces the FLTCPL, fault coupling control pin of the LTC1628.
Applications
- Notebook and Palmtop Computers, PDAs
- Battery Chargers
- Portable Instruments
- Battery-Operated Digital Devices
- DC Power Distribution Systems
Documentation
Data Sheet 1
User Guide 5
Application Note 2
Design Note 9
Technical Articles 6
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#PBF | 28-Lead SSOP | ||
| LTC1628CG#TRPBF | 28-Lead SSOP | ||
| LTC1628CG-PG#PBF | 28-Lead SSOP | ||
| LTC1628CG-PG#TRPBF | 28-Lead SSOP | ||
| LTC1628CUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC1628CUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC1628IG#PBF | 28-Lead SSOP | ||
| LTC1628IG#TRPBF | 28-Lead SSOP | ||
| LTC1628IG-PG#PBF | 28-Lead SSOP | ||
| LTC1628IG-PG#TRPBF | 28-Lead SSOP | ||
| LTC1628IUH#PBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | ||
| LTC1628IUH#TRPBF | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 6, 2022 - 22_0171 Laser Top Mark Conversion for SSOP Packages Assembled in PNG |
||
| LTC1628CG#PBF | PRODUCTION | |
| LTC1628CG#TRPBF | PRODUCTION | |
| LTC1628CG-PG#PBF | PRODUCTION | |
| LTC1628CG-PG#TRPBF | PRODUCTION | |
| LTC1628IG#PBF | PRODUCTION | |
| LTC1628IG#TRPBF | PRODUCTION | |
| LTC1628IG-PG#PBF | PRODUCTION | |
| LTC1628IG-PG#TRPBF | PRODUCTION | |
|
Jan 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC1628CUH#PBF | PRODUCTION | |
| LTC1628CUH#TRPBF | PRODUCTION | |
| LTC1628IUH#PBF | PRODUCTION | |
| LTC1628IUH#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
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
LTC1628CG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output
Resources
LTC1628CG-PG | High Efficiency, Multi-Phase 2-Output, Current Mode Controller, 5-30 VIN, 5V/4A and 3.3V/4A Output
Resources
LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Linear 12V @ 150mA
Resources
LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28VIN; 5V @ 3A, 3.3V @ 4A and a Synchronous 12V @ 200mA
Resources
LTC1628CG | Dual Phase Multi-Output High Current Converter, 7V to 24V Input, VOUT1 = 5V @ 12A Max., VOUT2 = 3.3V @ 12A Max.
Resources
LTC1628CUH Demo Board | Dual Output, 5V to 24VIN, 5VOUT1 @ 4A, 3.3VOUT2 @ 5A
Resources
LTC2920-2CMS8 LTC1628CG | LTC2920 with Dual DC to DC Converter, 7V to 24V Input, 5V @ 12A max = VOUT1, 3.3V @ 12A max = VOUT2
Resources
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