Power Management
Switching Regulator
Step-Down (Buck) Regulators
Multiple Output Buck
Power Management
Switching Regulator
Step-Down (Buck) Regulators
Poly-Phase Buck Controllers
Power Management
Switching Regulator
Step-Down (Buck) Regulators
External Power Switch Buck Controllers
LTC1628 - High Efficiency, 2-Phase Synchronous Step-Down Switching Regulator
Features
- 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 x 5mm QFN and 28-Pin SSOP Packages
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-28, SSOP-28
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC1628CG | SSOP | 28 | C | $5.20 | $4.45 | View |
| LTC1628CG#PBF | SSOP | 28 | C | $5.20 | $4.45 | View |
| LTC1628CG#TR | SSOP | 28 | C | $4.55 | View | |
| LTC1628CG#TRPBF | SSOP | 28 | C | $4.55 | View | |
| LTC1628CG-PG | SSOP | 28 | C | $5.45 | $4.65 | View |
| LTC1628CG-PG#PBF | SSOP | 28 | C | $5.45 | $4.65 | View |
| LTC1628CG-PG#TR | SSOP | 28 | C | $4.76 | View | |
| LTC1628CG-PG#TRPBF | SSOP | 28 | C | $4.76 | View | |
| LTC1628CG-SYNC | SSOP | 28 | C | $5.45 | $4.65 | View |
| LTC1628CG-SYNC#PBF | SSOP | 28 | C | $5.45 | $4.65 | View |
| LTC1628CG-SYNC#TR | SSOP | 28 | C | $4.76 | View | |
| LTC1628CG-SYNC#TRPBF | SSOP | 28 | C | $4.76 | View | |
| LTC1628CUH | QFN | 32 | C | $6.70 | $4.55 | View |
| LTC1628CUH#PBF | QFN | 32 | C | $6.70 | $4.55 | View |
| LTC1628CUH#TR | QFN | 32 | C | $4.65 | View | |
| LTC1628CUH#TRPBF | QFN | 32 | C | $4.65 | View | |
| LTC1628IG | SSOP | 28 | I | $6.30 | $5.35 | View |
| LTC1628IG#PBF | SSOP | 28 | I | $6.30 | $5.35 | View |
| LTC1628IG#TR | SSOP | 28 | I | $5.45 | View | |
| LTC1628IG#TRPBF | SSOP | 28 | I | $5.45 | View | |
| LTC1628IG-PG | SSOP | 28 | I | $6.50 | $5.55 | View |
| LTC1628IG-PG#PBF | SSOP | 28 | I | $6.50 | $5.55 | View |
| LTC1628IG-PG#TR | SSOP | 28 | I | $5.66 | View | |
| LTC1628IG-PG#TRPBF | SSOP | 28 | I | $5.66 | View | |
| LTC1628IG-SYNC | SSOP | 28 | I | $6.50 | $5.55 | View |
| LTC1628IG-SYNC#PBF | SSOP | 28 | I | $6.50 | $5.55 | View |
| LTC1628IG-SYNC#TR | SSOP | 28 | I | $5.66 | View | |
| LTC1628IG-SYNC#TRPBF | SSOP | 28 | I | $5.66 | View | |
| LTC1628IUH | QFN | 32 | I | $8.04 | $5.45 | View |
| LTC1628IUH#PBF | QFN | 32 | I | $8.04 | $5.45 | View |
| LTC1628IUH#TR | QFN | 32 | I | $5.55 | View | |
| LTC1628IUH#TRPBF | QFN | 32 | I | $5.55 | View | |
| Buy Now • Request Samples | ||||||
Demo Boards
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 |
|---|---|---|---|
| DC236C-A | LTC1628CG | Hi Efficiency, Multi-Phase 2-Output, C | $125.00 | |
| DC236C-C | LTC1628CG-PG | Hi Efficiency, Multi-Phase 2-Output | $125.00 | |
| DC264A | LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28V | $125.00 | |
| DC265A | LTC1628CG | Multi-Phase, 3 Output Regulator, 7-28V | Contact Factory | |
| DC271A | LTC1628CG | Dual Phase Multi-Output High Current C | Contact Factory | |
| DC392A-A | LTC1628CUH | High Efficiency Dual Regulator, 5V to | $125.00 | |
| DC543A | LTC2920-2CMS8 LTC1628CG | LTC2920 with Dual DC to | $100.00 | |
| Buy Now | |||
Applications
- Notebook and Palmtop Computers, PDAs
- Battery Chargers
- Portable Instruments
- Battery-Operated Digital Devices
- DC Power Distribution Systems
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Related models available in LTspice IV
LTC1628-PG
LTC1628-SYNC
LTC1628
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.