LTC1778/LTC1778-1
PRODUCTIONWide Operating Range, No RSENSE Step-Down Controller
- Part Models
- 6
- 1ku List Price
- Starting From $4.12
Overview
- No Sense Resistor Required
- True Current Mode Control
- Optimized for High Step-Down Ratios
- tON(MIN) <=100ns
- Extremely Fast Transient Response
- Stable with Ceramic COUT
- Dual N-Channel MOSFET Synchronous Drive
- Power Good Output Voltage Monitor (LTC1778)
- Adjustable On-Time (LTC1778-1)
- Wide VIN Range: 4V to 36V
- ±1% 0.8V Voltage Reference
- Adjustable Current Limit
- Adjustable Switching Frequency
- Programmable Soft-Start
- Output Overvoltage Protection
- Optional Short-Circuit Shutdown Timer
- Micropower Shutdown: IQ <30µA
- Available in a 16-Pin Narrow SSOP Package
The LTC1778 is a synchronous stepdown switching regulator controller optimized for CPU power. The controller uses a valley current control architecture to deliver very low duty cycles with excellent transient response without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN.
Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference, and can assist secondary winding regulation by disabling discontinuous operation when the main output is lightly loaded.
Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is user programmable. Wide supply range allows operation from 4V to 36V at the input and from 0.8V up to (0.9)VIN at the output.
Applications
- Notebook and Palmtop Computers, PDAs
- Distributed Power Systems
Documentation
Data Sheet 1
User Guide 2
Design Note 3
Technical Articles 4
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 |
|---|---|---|---|
| LTC1778EGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1778EGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1778EGN-1#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1778EGN-1#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1778IGN#PBF | 16-Lead SSOP (Narrow 0.15 Inch) | ||
| LTC1778IGN#TRPBF | 16-Lead SSOP (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking |
||
| LTC1778EGN#PBF | PRODUCTION | |
| LTC1778EGN#TRPBF | PRODUCTION | |
| LTC1778EGN-1#PBF | PRODUCTION | |
| LTC1778EGN-1#TRPBF | PRODUCTION | |
| LTC1778IGN#PBF | PRODUCTION | |
| LTC1778IGN#TRPBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0235 Epoxy Change from Henkel 8290 to 8290A for GN Package |
||
| LTC1778EGN#PBF | PRODUCTION | |
| LTC1778EGN#TRPBF | PRODUCTION | |
| LTC1778EGN-1#PBF | PRODUCTION | |
| LTC1778EGN-1#TRPBF | PRODUCTION | |
| LTC1778IGN#PBF | PRODUCTION | |
| LTC1778IGN#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG] |
||
| LTC1778EGN#PBF | PRODUCTION | |
| LTC1778EGN#TRPBF | PRODUCTION | |
| LTC1778EGN-1#PBF | PRODUCTION | |
| LTC1778EGN-1#TRPBF | PRODUCTION | |
| LTC1778IGN#PBF | PRODUCTION | |
| LTC1778IGN#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| LTC3878 | PRODUCTION | Fast, Wide Operating Range No RSENSE Step-Down DC/DC Controller |
Tools & Simulations
LTspice 1
Models for the following parts are available in LTspice:
- LTC1778
- LTC1778-1
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
LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A
Resources
LTC1778EGN | No RSENSE, 5V ≤ VIN ≤ 25V, VOUT = 2.5V @ 10A
Resources
LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A
Resources
LTC1778EGN Demo Board | IMVPII I/O Power Supply, VIN = 5V-25V, VOUT = 1.2V @ 6A