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Analog Devices Inc. LTC1267CG-ADJ5
- Part No.:
- LTC1267CG-ADJ5
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LTC1267CG-ADJ5.pdf
- Description:
- IC REG CTRLR BUCK 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,549
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Product details
Overview
LTC1267CG-ADJ5 from Analog Devices (formerly Linear Technology) is a dual synchronous step-down switching regulator controller with independent 3.3V and adjustable 5V outputs, 4V–40V input range, up to 95% efficiency, 400kHz max switching frequency, and constant off-time current-mode control-used in portable instrumentation and battery-powered digital systems.
For engineers reviewing the LTC1267CG-ADJ5 datasheet, LTC1267CG-ADJ5 pinout, LTC1267CG-ADJ5 application, or LTC1267CG-ADJ5 equivalent, key selection factors include dual-output voltage configuration, external MOSFET driver architecture, Burst Mode™ operation for light-load efficiency, programmable current limit via sense resistor, and 28-pin SSOP package compatibility.
Technical Context
The LTC1267CG-ADJ5 implements two independent constant off-time current-mode controllers-one fixed at 3.3V, one adjustable (via feedback divider) nominally at 5V-each driving complementary external P/N-channel MOSFETs. It supports 100% duty cycle for ultra-low dropout and uses separate shutdown pins (SHDN3, SHDN5, MSHDN) for micropower control.
Burst Mode™ operation reduces quiescent current to 20µA in shutdown while maintaining fast line/load transient response. The VCC3/VCC5 pins can be powered from regulated outputs to improve high-VIN efficiency, and output current is set by external sense resistors (e.g., 0.05Ω for 2A).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 40V - supports wide industrial and automotive supply rails without pre-regulation |
| Output Configuration | 3.3V fixed + adjustable 5V - enables dual-rail system power with single IC |
| Switching Frequency | Up to 400kHz - balances EMI, inductor size, and efficiency in compact layouts |
| Efficiency | Up to 95% - achieved via synchronous FET drive and Burst Mode™ at light loads |
| Shutdown Current | 20µA - enables long battery life in portable devices during standby |
| Duty Cycle Range | 0% to 100% - allows operation down to VIN ≈ VOUT for minimal dropout loss |
| Current Sensing | External resistor-based - permits precise, scalable overcurrent protection (e.g., 0.05Ω = 2A) |
Pinout & Package
Package: 28-pin SSOP (0.209" width), RoHS-compliant, surface-mount.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply rail | Accepts 4V–40V unregulated input; powers internal logic and gate drivers |
| PGATE3 / NGATE3 | 3.3V channel high/low-side gate drivers | Drives external P-CH/N-CH MOSFET pair for 3.3V output stage |
| PGATE5 / NGATE5 | 5V channel high/low-side gate drivers | Drives external P-CH/N-CH MOSFET pair for adjustable 5V output stage |
| SENSE+3 / SENSE–3 SENSE+5 / SENSE–5 | Current sense differential inputs | Monitor inductor current via external sense resistor for cycle-by-cycle current mode control |
| SHDN3 / SHDN5 / MSHDN | Independent shutdown controls | Logic-low active; each enables micropower shutdown of respective channel or master disable |
| VCC3 / VCC5 / EXT VCC | Driver supply inputs | VCC3/VCC5 may be tied to respective outputs for higher efficiency at high VIN; EXT VCC provides alternate bias |
| CT3 / CT5 | Constant off-time timing capacitors | Set switching frequency per channel (e.g., 270pF ≈ 400kHz) |
| ITH3 / ITH5 | Current limit threshold inputs | Set peak inductor current limit via external resistor divider from VCC |
Key Features
| Feature | Design Value |
|---|---|
| Burst Mode™ operation | Maintains >85% efficiency at 1mA load, reducing no-load power dissipation in battery systems |
| Independent channel shutdown | Enables dynamic power partitioning-e.g., keep 3.3V active while disabling 5V rail during low-power states |
| 100% duty cycle capability | Supports VIN-to-VOUT dropout as low as 100mV, critical for Li-ion battery end-of-discharge operation |
| External MOSFET control | Allows optimization of RDS(on), voltage rating, and thermal layout-e.g., Si9435DY/Si9410DY pairs used in reference design |
| Separate VCC sourcing | Permits VCC3/VCC5 to be derived from regulated outputs, improving efficiency by ~3% at VIN = 24V |
Applications
| Portable Instrumentation | Notebook Computing |
|---|---|
Use Scenario: Handheld multimeters and data loggers powered by 2-cell Li-ion (6V–8.4V) requiring clean, isolated 3.3V and 5V rails. IC Role / Device Role / Timing Role: Dual-output DC/DC controller managing independent power domains for MCU, ADC, and display interface. Use Value: Burst Mode™ extends battery runtime beyond 12 hours; 100% duty cycle sustains 5V output down to 5.2V input. | Use Scenario: Subnotebook motherboard with space-constrained layout needing dual-core SoC I/O and memory supply rails. IC Role / Device Role / Timing Role: Primary step-down controller delivering regulated 3.3V (core I/O) and adjustable 5V (USB peripheral bus) from shared 12V rail. Use Value: Synchronous FET drive achieves 94% efficiency at 1.5A/3.3V and 1.2A/5V, minimizing thermal load in sealed chassis. |
| Battery-Operated Digital Devices | DC Power Distribution Systems |
Use Scenario: Wireless sensor node using AA alkaline cells (up to 3.2V/cell) with boost + buck architecture feeding 3.3V MCU and 5V radio module. IC Role / Device Role / Timing Role: Secondary buck controller accepting boosted 7V–10V input to generate stable dual outputs under varying cell voltage. Use Value: 20µA shutdown current preserves shelf life; independent SHDN pins allow radio sleep while MCU remains active. | Use Scenario: Industrial DIN-rail power module converting 24VDC to distributed 3.3V logic and 5V interface rails across multiple PCBs. IC Role / Device Role / Timing Role: High-reliability dual controller supporting remote sensing, current limiting, and fault reporting via ITH pins. Use Value: External sense resistors enable ±3% current limit accuracy across temperature; SSOP package supports conformal coating for harsh environments. |
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, 2-phase interleaved controller; no integrated dual-output topology or Burst Mode™ | Requires two ICs for dual independent rails; better suited for high-current single-output designs | Choose LTC3717EGN only when >5A per rail is needed and board area allows dual IC placement |
| TPS54290RGTT | Dual-channel, but non-synchronous (external diode required); no 100% duty cycle; lower max VIN (32V) | Lacks light-load efficiency optimization and true dropout capability below 3.5V difference | Select TPS54290RGTT where cost sensitivity outweighs efficiency and dropout requirements |
Compared with LTC3717EGN and TPS54290RGTT, the LTC1267CG-ADJ5 uniquely delivers integrated dual independent outputs with Burst Mode™, 100% duty cycle, and 40V input tolerance-making it optimal for space- and battery-life-constrained dual-rail systems where both rails must operate reliably down to low input voltages.
Availability
LTC1267CG-ADJ5 is available at Aetrix Electronics and suitable for portable instrumentation, notebook computing, and battery-operated digital devices requiring stable component supply and long-term design continuity.
Supply support for LTC1267CG-ADJ5 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; Linear pioneered high-performance analog and power management ICs with emphasis on precision, efficiency, and reliability.
The LTC1267 series was designed specifically for compact, high-efficiency dual-output DC/DC conversion in portable and battery-critical applications-prioritizing light-load efficiency, wide input range, and flexible external FET control.
FAQ
What output voltages does the LTC1267CG-ADJ5 support?
The LTC1267CG-ADJ5 provides one fixed 3.3V output and one adjustable output nominally configured for 5V via external feedback resistors. The adjustable channel supports output voltages from 1.25V to VIN – 1V, enabling custom rail generation. Both channels operate independently with separate current sensing and shutdown controls, and the LTC1267CG-ADJ5 datasheet specifies typical 3.3V/2A and 5V/2A operation using recommended MOSFETs and inductors.
Does the LTC1267CG-ADJ5 require external MOSFETs?
Yes, the LTC1267CG-ADJ5 is a controller-not an integrated power stage-and requires external complementary P-channel and N-channel MOSFETs for each output. Reference designs use Si9435DY (P-CH) and Si9410DY (N-CH) per channel. Gate drive strength, RDS(on), and thermal layout are user-selectable, allowing optimization for efficiency, size, or cost. The LTC1267CG-ADJ5 drives these FETs with dedicated PGATE/NGATE pins and supports bootstrap or direct VCC sourcing.
How does Burst Mode™ improve efficiency in the LTC1267CG-ADJ5?
Burst Mode™ in the LTC1267CG-ADJ5 reduces switching activity during light loads by skipping cycles while maintaining regulation, lowering quiescent current to ~20µA in shutdown and sustaining >85% efficiency at 1mA output. This extends battery life significantly in standby or intermittent-use applications. Unlike forced PWM, Burst Mode™ eliminates switching losses at low current, and the LTC1267CG-ADJ5 automatically engages it below ~10% load without external configuration.
Can the LTC1267CG-ADJ5 operate with input voltage close to the output voltage?
Yes, the LTC1267CG-ADJ5 supports 100% duty cycle operation, enabling dropout as low as 100mV-critical for battery-powered systems nearing end-of-discharge. When VIN drops within ~3.4V of the 3.3V output or ~5.1V of the 5V output, the high-side P-FET remains fully enhanced, eliminating switching losses. This behavior is inherent to the controller architecture and requires no external circuitry; the LTC1267CG-ADJ5 maintains regulation continuously across the full 4V–40V input range.
What is the function of the MSHDN pin on the LTC1267CG-ADJ5?
The MSHDN (Master Shutdown) pin on the LTC1267CG-ADJ5 provides global disable control: pulling MSHDN high (>2V) shuts down both regulator channels simultaneously, reducing total supply current to 20µA. It operates independently of SHDN3 and SHDN5, allowing hierarchical power management-e.g., system-level sleep initiated by MSHDN while individual rails retain local control via SHDN3/SHDN5. The LTC1267CG-ADJ5 datasheet confirms MSHDN overrides per-channel shutdown states and disables all gate drivers and bias circuits.
LTC1267CG-ADJ5 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-ADJ5 FAQ
1.How can I place an order for LTC1267CG-ADJ5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC1267CG-ADJ5 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-ADJ5 reliable?
The price and inventory of LTC1267CG-ADJ5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC1267CG-ADJ5 is usually 5 days.
3.What payment methods are accepted for LTC1267CG-ADJ5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC1267CG-ADJ5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC1267CG-ADJ5?
LTC1267CG-ADJ5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC1267CG-ADJ5 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-ADJ5?
For technical support, including LTC1267CG-ADJ5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC1267CG-ADJ5 requirements.
6.How does Aetrix verify that LTC1267CG-ADJ5 is sourced from the original manufacturer or authorized distributors?
All LTC1267CG-ADJ5 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-ADJ5 meets industry standards.
7.What is the process for return or replacement of LTC1267CG-ADJ5?
All LTC1267CG-ADJ5 units undergo pre-shipment inspection (PSI). If there is an issue with LTC1267CG-ADJ5, 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-ADJ5 part is unused and in its original packaging.
Return procedure for LTC1267CG-ADJ5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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