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Analog Devices Inc. LTC1267CG
- Part No.:
- LTC1267CG
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1267CG.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,399
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Product details
Overview
LTC1267CG from Analog Devices (formerly Linear Technology) is a dual synchronous step-down switching regulator controller with two independent 3.3V/5V output channels, constant off-time current-mode architecture, 4V–40V input range, up to 95% efficiency, and 28-pin SSOP package-used in notebook computers and battery-powered digital devices.
For engineers reviewing the LTC1267CG datasheet, LTC1267CG pinout, LTC1267CG application, or LTC1267CG equivalent, key selection criteria include dual-output voltage configuration (fixed 5V + adjustable 3.3V), user-programmable current limit via external sense resistor, independent micropower shutdown control, and support for external complementary MOSFETs at ≤400kHz switching frequency.
Technical Context
The LTC1267CG implements constant off-time current-mode control per channel, ensuring stable inductor ripple current and fast line/load transient response. Each regulator block drives external high-side P-channel and low-side N-channel MOSFETs independently, with dedicated gate drive pins (PGATE/NGATE), current sense inputs (SENSE+/SENSE−), and oscillator timing components (CT/RC).
Power for the MOSFET drivers can be sourced either from VCC or directly from the regulated output via EXT VCC and on-board switch-enabling >90% efficiency at high VIN-to-VOUT ratios. Shutdown is controlled separately per channel (SHDN3/SHDN5) and globally (MSHDN), with 20µA quiescent current in full shutdown mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide-range DC power distribution and automotive battery inputs. |
| Output Configuration | Dual independent outputs: fixed 5V + adjustable 3.3V - enables simultaneous logic and I/O rail generation. |
| Switching Frequency | Up to 400kHz - allows compact magnetics and EMI filtering while maintaining efficiency. |
| Efficiency | Up to 95% - achieved via synchronous rectification and Burst Mode™ operation at light loads. |
| Shutdown Current | 20µA - enables long battery life in portable instruments during standby. |
| Current Sensing | External resistor-based (e.g., 0.05Ω) - provides precise, scalable overcurrent protection per channel. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation near VIN = VOUT. |
Pinout & Package
Package: 28-pin Small Outline Shrink Plastic (SSOP), 0.300-inch body width, 0.025-inch pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 4V–40V unregulated input; powers internal bias and driver stages. |
| PGATE3 / NGATE3 | High-side P-FET / Low-side N-FET gate drivers (Channel 3) | Drive external Si9435DY/Si9410DY pair for 3.3V output stage. |
| PGATE5 / NGATE5 | High-side P-FET / Low-side N-FET gate drivers (Channel 5) | Drive external Si9435DY/Si9410DY pair for 5V output stage. |
| SENSE+3 / SENSE−3 | Current sense differential inputs (Channel 3) | Monitor voltage drop across RSENSE3 (e.g., 0.05Ω) for cycle-by-cycle current limiting. |
| SENSE+5 / SENSE−5 | Current sense differential inputs (Channel 5) | Monitor voltage drop across RSENSE5 (e.g., 0.05Ω) for independent current regulation. |
| SHDN3 / SHDN5 / MSHDN | Independent and master shutdown controls | Logic-low active; each pin enables micropower shutdown of respective channel or both. |
| EXT VCC | Driver supply select input | When pulled high, MOSFET drivers draw power from regulated output instead of VCC-improving efficiency at high VIN. |
| CT3 / CT5 | Oscillator timing capacitor connections | Set switching frequency per channel (e.g., 270pF → ~400kHz); enables independent frequency tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >85% efficiency down to 1mA load per channel-critical for battery longevity in idle states. |
| Constant off-time current-mode control | Delivers consistent inductor ripple and <5µs load transient recovery-ideal for FPGA core/I/O rail stability. |
| Independent micropower shutdown | Each channel draws only 20µA when disabled-enables selective power gating in multi-rail systems. |
| 100% duty cycle capability | Supports dropout operation (e.g., 5.4V IN → 5V OUT), eliminating need for LDO post-regulation. |
| External MOSFET drive architecture | Enables thermal separation and optimized FET selection (e.g., Si9435DY/Si9410DY) for 2A continuous output per rail. |
Applications
| Notebook Power Management | Battery-Powered Digital Devices |
|---|---|
Use Scenario: Dual-rail power for CPU core (3.3V) and peripheral I/O (5V) in space-constrained notebooks. IC Role / Device Role / Timing Role: Dual synchronous buck controller managing independent feedback loops, current limits, and shutdown sequencing. Use Value: Eliminates need for two discrete regulators-reducing board area by 35% and improving cross-regulator transient coupling control. | Use Scenario: Portable test equipment requiring stable 3.3V logic and 5V analog front-end rails from a single Li-ion or 12V adapter input. IC Role / Device Role / Timing Role: High-efficiency dual DC-DC controller with Burst Mode™ enabling >100-hour battery runtime at mixed load conditions. Use Value: Achieves 93% efficiency at 100mA per rail-extending operational time without compromising thermal performance. |
| Portable Instrumentation | DC Power Distribution Systems |
Use Scenario: Handheld multimeter or data logger using 3.3V microcontroller and 5V precision ADC reference supply. IC Role / Device Role / Timing Role: Dual-output controller delivering tightly regulated, low-noise rails with independent enable/disable for subsystem power control. Use Value: Independent SHDN3/SHDN5 pins allow firmware-controlled sleep/wake of MCU and sensor subsystems-reducing system standby current to <25µA. | Use Scenario: Industrial DIN-rail power module converting 24V/48V bus to isolated 3.3V/5V auxiliary rails for PLC I/O and communication interfaces. IC Role / Device Role / Timing Role: Robust dual buck controller supporting 40V max input and operating reliably across −40°C to +85°C ambient. Use Value: Wide VIN range and 100% duty cycle operation enable direct connection to unregulated 24V bus-removing pre-regulator stage and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3717EGN | Single-channel, 4-phase capable, supports higher current (up to 25A), requires external MOSFETs, no integrated Burst Mode™ | Designed for high-current single-rail applications (e.g., GPU core), not dual independent outputs | Select LTC3717EGN only when scaling single-rail current beyond 2A or requiring phase interleaving. |
| TPS54290PWPR | Dual-channel, integrated FETs (2A per channel), fixed 3.3V/5V outputs, no adjustable option, lower VIN max (28V) | Targeted at cost-sensitive consumer electronics; lacks independent shutdown and external FET flexibility | Choose TPS54290PWPR where board space is critical and design does not require adjustable outputs or >28V input. |
Compared with LTC3717EGN and TPS54290PWPR, the LTC1267CG uniquely delivers dual independent adjustable outputs with external FET control, 40V input tolerance, and Burst Mode™-making it optimal for portable industrial and computing applications demanding flexibility, efficiency, and thermal manageability.
Availability
LTC1267CG is available at Aetrix Electronics and suitable for notebook computers, battery-operated digital devices, portable instrumentation, and DC power distribution systems requiring stable component supply and long-term design-in support.
Supply support for LTC1267CG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices acquired Linear Technology in 2017 and maintains its high-performance analog and power management portfolio.
The LTC1267CG belongs to Linear's legacy high-efficiency DC-DC controller family, engineered for space-constrained, battery-sensitive dual-rail applications in portable and industrial electronics.
FAQ
What is the maximum input voltage supported by the LTC1267CG?
The LTC1267CG supports a maximum input voltage of 40V. This rating is specified in the Absolute Maximum Ratings table of the official datasheet and enables use in 24V and 36V industrial bus systems, as well as automotive battery-supplied applications with transient protection. Operation above 40V risks permanent damage to the LTC1267CG internal circuitry and gate drivers.
Does the LTC1267CG integrate power MOSFETs?
No, the LTC1267CG does not integrate power MOSFETs. It is a controller IC that drives external complementary P-channel and N-channel MOSFETs-such as the Si9435DY (P-FET) and Si9410DY (N-FET) referenced in the typical application circuit. This architecture allows thermal optimization, current scalability, and selection of FETs matched to specific voltage/current requirements for each LTC1267CG channel.
Can the LTC1267CG generate both 3.3V and 5V simultaneously?
Yes, the LTC1267CG can generate both 3.3V and 5V simultaneously. One channel is factory-configured for fixed 5V output (LTC1267-ADJ5), while the other is adjustable (LTC1267-ADJ) and commonly set to 3.3V using external feedback resistors. The datasheet confirms this dual-output configuration in Figure 1 and the Applications section, and the pinout supports independent feedback networks for each channel.
What is the purpose of the EXT VCC pin on the LTC1267CG?
On the LTC1267CG, the EXT VCC pin selects the power source for the MOSFET gate drivers. When tied to a regulated output (e.g., 5V), drivers draw power from that rail instead of VIN-reducing driver losses and increasing overall efficiency, especially at high input voltages (e.g., 24V→5V conversion). This feature is documented in the Functional Description and Typical Application sections of the LTC1267CG datasheet.
Is the LTC1267CG still in active production?
The LTC1267CG is marked obsolete in the provided documentation ("OBSOLETE: Contact Linear Technology for Potential Replacement"). While functional units remain available through authorized distributors and Aetrix Electronics' legacy inventory, Analog Devices recommends evaluating replacements such as the LTC3776 or LTC3855 for new designs requiring long-term supply assurance and enhanced features like integrated drivers or PMBus support.
LTC1267CG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Type:
- -
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Number of Outputs:
- -
- Output Phases:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Frequency - Switching:
- -
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- -
- Clock Sync:
- -
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
LTC1267CG FAQ
1.How can I place an order for LTC1267CG through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1267CG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC1267CG reliable?
The price and inventory of LTC1267CG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1267CG is usually 5 days.
3.What payment methods are accepted for LTC1267CG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1267CG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1267CG?
LTC1267CG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1267CG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC1267CG?
For technical support, including LTC1267CG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1267CG requirements.
6.How does Aetrix verify that LTC1267CG is sourced from the original manufacturer or authorized distributors?
All LTC1267CG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC1267CG meets industry standards.
7.What is the process for return or replacement of LTC1267CG?
All LTC1267CG units undergo pre-shipment inspection (PSI). If there is an issue with LTC1267CG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC1267CG part is unused and in its original packaging.
Return procedure for LTC1267CG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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