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Analog Devices Inc. LTC3127EDD#PBF
- Part No.:
- LTC3127EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3127EDD#PBF.pdf
- Description:
- IC BUCK BOOST SYNC ADJ 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:763
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Product details
Overview
LTC3127EDD#PBF from Analog Devices (formerly Linear Technology) is a 1.35MHz fixed-frequency, synchronous buck-boost DC/DC converter with programmable average input current limit (0.2A–1A ±4%), 1.8V–5.5V input range, and 1.8V–5.25V regulated output. It operates seamlessly across buck, buck-boost, and boost modes-ideal for USB-powered GSM modems and supercapacitor chargers where input voltage may dip below or exceed the output.
For engineers reviewing the LTC3127EDD#PBF datasheet, LTC3127EDD#PBF pinout, LTC3127EDD#PBF application, or LTC3127EDD#PBF equivalent, key selection criteria include input current limit accuracy, continuous conduction in PWM mode, thermal regulation behavior at 130°C, and DFN package thermal performance (θJA = 43°C/W).
Technical Context
The LTC3127EDD#PBF implements an average-input-current-controlled buck-boost topology with proprietary switching logic that ensures continuous inductor current and stable loop transfer function across all three operating regions (buck, buck-boost, boost). Its dual-loop architecture separates outer voltage regulation (externally compensated via VC pin) from inner current control (internally compensated).
It supports pin-selectable Burst Mode® operation (IQ = 35μA) or forced continuous PWM mode (IQ = 400μA), features thermal regulation (current limit reduction above 130°C), reverse-current limiting (~300mA), and zero-current detection to disable synchronous rectification below ~30mA in Burst Mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, USB 2.0/3.0, and 3.3V/5V rail inputs without external pre-regulation. |
| Output Voltage Range | 1.8V to 5.25V - set via resistor divider on FB pin with 1.195V reference; enables direct 3.3V or 5V system rail generation. |
| Avg Input Current Limit | 0.2A to 1A ±4% - programmed by single resistor on PROG pin; critical for power-limited sources like USB ports or energy-harvesting systems. |
| Switching Frequency | 1.35MHz fixed - enables use of small 2.2–4.7μH inductors and compact ceramic output capacitors (≥22μF low-ESR). |
| Efficiency | Up to 96% - achieved via synchronous rectification with MOSFET RDS(ON): SWA/SWD ≤190mΩ, SWB/SWC ≤170mΩ. |
| Shutdown Current | <1μA - ensures minimal battery drain in standby; SHDN pin threshold: VIL ≤0.3V, VIH ≥1.2V. |
| Package | 10-lead 3mm × 3mm × 0.75mm DFN with exposed PGND pad - requires PCB soldering for θJA = 43°C/W thermal performance. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed power ground pad (Pin 11), rated for –40°C to +85°C junction temperature. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Switch node A/B connection | Connects internal P-channel (A) and N-channel (B) MOSFETs; ties to one end of inductor; minimize trace length for EMI control. |
| VIN (Pin 2) | Main input supply and internal VCC rail | Accepts 1.8–5.5V; requires ≥10μF ceramic decoupling capacitor placed adjacent to VIN and PGND. |
| SHDN (Pin 3) | Logic-controlled shutdown enable | Pull ≤0.3V to enter shutdown (<1μA IQ); pull ≥1.2V for normal operation; tolerates voltage >VIN. |
| MODE (Pin 4) | Burst Mode / PWM mode select | High = Burst Mode (35μA IQ, discontinuous conduction); Low = forced PWM (400μA IQ, continuous conduction, lower noise). |
| PROG (Pin 5) | Average input current limit programming | Resistor to SGND sets IIN(LIMIT) per RPROG = 54.92·ILIMIT(A) + 4.94kΩ; accuracy ±4% over –40°C to 85°C. |
| SGND (Pin 6) | Signal ground reference | Reference point for PROG resistor, FB divider, and compensation network; separate from PGND to reduce noise coupling. |
| FB (Pin 7) | Output voltage feedback sense | Monitors resistive divider; 1.195V internal reference; sets VOUT = 1.195·(1 + R1/R2) from 1.8V to 5.25V. |
| VC (Pin 8) | Error amplifier output | External compensation node; supports integral or proportional compensation depending on output capacitance (≥1000μF for proportional). |
| VOUT (Pin 9) | Regulated output node | Delivers up to 1A (VIN > 3V) or 0.6A (VIN > 1.8V); requires ≥22μF low-ESR output capacitor tied to PGND. |
| SW2 (Pin 10) | Switch node C/D connection | Connects internal N-channel (C) and P-channel (D) MOSFETs; ties to second end of inductor; minimize trace length for EMI control. |
| PGND (Pin 11) | Power ground / exposed thermal pad | Common return for high-current switches and inductor; must be soldered to large PCB ground plane for thermal management (θJA = 43°C/W). |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input current limit | 0.2A–1A ±4% accuracy over temperature, set by single external resistor-enables compliance with USB current limits and safe supercap charging. |
| Seamless tri-mode operation | Continuous inductor current and stable loop response across buck, buck-boost, and boost regions-eliminates output transients during VIN/VOUT crossover. |
| Thermal regulation | Reduces input current limit starting at ~130°C die temperature-prevents thermal shutdown during high-capacitance charging or sustained overload. |
| Reverse-current protection | ~300mA threshold disables switch D when output supplies current back into input-protects upstream sources like batteries or USB ports. |
| Zero-current detection | Disables synchronous rectifier below ~30mA in Burst Mode-prevents reverse inductor current and improves light-load efficiency. |
Applications
| USB Powered GSM Modems | Supercapacitor Chargers |
|---|---|
Use Scenario: GSM modem powered directly from USB 2.0 port (5V/500mA max) requiring stable 3.3V rail despite varying RF transmit current pulses. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 3.3V output while dynamically managing input current to stay within USB spec and prevent host port shutdown. Use Value: Programmable 500mA input current limit (RPROG = 32.4kΩ) ensures reliable operation without violating USB power budget; Burst Mode extends standby time. | Use Scenario: Charging a 10F/2.7V supercapacitor from a 3.6V Li-ion battery, with controlled inrush and thermal management. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger using average input current limit as proxy for charge current, with thermal regulation preventing overheating during bulk charge. Use Value: Thermal regulator reduces current limit above 130°C-avoids thermal runaway during high-power charging; reverse-current limit blocks discharge back to battery. |
| Handheld Test Instruments | Wireless Terminals |
Use Scenario: Portable multimeter or oscilloscope with dual-rail requirement (e.g., ±3.3V) powered from single 3.6V Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V buck-boost supply enabling efficient generation of auxiliary rails via LDOs or charge pumps; supports deep sleep states. Use Value: <1μA shutdown current preserves battery life during storage; 1.35MHz switching allows miniature 4.7μH inductor and compact layout. | Use Scenario: Industrial handheld terminal with 3.3V logic and 5V display backlight, powered from 4.2V Li-ion battery with wide discharge curve. IC Role / Device Role / Timing Role: Single-stage buck-boost generating stable 5V for backlight while maintaining 3.3V logic rail-no need for cascaded converters. Use Value: Seamless mode transition ensures no output glitch when battery drops from 4.2V to 3.0V; 96% peak efficiency minimizes heat in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3129EMSE#PBF | Higher input voltage (up to 15V), lower quiescent current (2.5μA), integrated soft-start; no programmable input current limit. | Better suited for higher-VIN industrial sensors; lacks precise input current control needed for USB compliance or supercap charging. | Select LTC3127EDD#PBF when input current limiting is mandatory; choose LTC3129EMSE#PBF for wider VIN and ultra-low IQ. |
| TPS63020DSJR | 4A output capability, 2.5V–5.5V input, fixed 3.3V/5V options; no programmable input current limit; lower efficiency at light loads (no Burst Mode equivalent). | Targeted at high-current portable devices (e.g., tablets); unsuitable for applications requiring strict input current capping or sub-1μA shutdown. | LTC3127EDD#PBF preferred for USB-powered designs with tight input current budgets; TPS63020DSJR fits high-output-current needs without current-limiting requirement. |
Compared with LTC3129EMSE#PBF and TPS63020DSJR, the LTC3127EDD#PBF uniquely combines accurate programmable input current limiting, sub-1μA shutdown, and seamless tri-mode operation in a thermally optimized 3mm × 3mm DFN-making it optimal for power-constrained, battery-operated systems requiring regulatory compliance and thermal resilience.
Availability
LTC3127EDD#PBF is available at Aetrix Electronics and suitable for USB-powered modems, supercapacitor charging circuits, handheld test instruments, and wireless terminals requiring stable component supply and long-term manufacturability.
Supply support for LTC3127EDD#PBF 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, Inc. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and power management ICs, formed through the acquisition of Linear Technology in 2017.
The LTC3127EDD#PBF belongs to ADI's Power by Linear™ buck-boost converter family, engineered for applications demanding input current regulation, wide VIN/VOUT flexibility, and robust thermal behavior in space-constrained portable systems.
FAQ
What is the exact input current limit accuracy of the LTC3127EDD#PBF across temperature?
The LTC3127EDD#PBF guarantees ±4% average input current limit accuracy over the full –40°C to +85°C junction temperature range when configured with appropriate RPROG; typical error is ±2% at 25°C. Accuracy degrades slightly at extremes-e.g., RPROG = 32.4kΩ yields 465–540mA over temperature-not ±4% of nominal but bounded by min/max specs in the Electrical Characteristics table.
Can the LTC3127EDD#PBF operate with input voltage below 1.8V?
No-the LTC3127EDD#PBF has a hard input undervoltage lockout (UVLO) threshold of 1.7V (typical); operation ceases if VIN drops below this level. The specified minimum operating input voltage is 1.8V, and performance-including current limit accuracy and regulation-is only guaranteed within 1.8V–5.5V.
How does thermal regulation affect the LTC3127EDD#PBF during supercapacitor charging?
During high-current supercapacitor charging, the LTC3127EDD#PBF's thermal regulator begins reducing the programmed input current limit when die temperature exceeds ~130°C. This prevents thermal shutdown (which triggers at ~150°C) and maintains safe operation-though output current declines progressively until full recovery below 130°C.
Is the LTC3127EDD#PBF pin-compatible with other Linear Technology buck-boost converters?
No-LTC3127EDD#PBF uses a unique 10-pin DFN pinout optimized for its tri-mode control architecture. It is not pin-compatible with LTC3129, LTC3115, or LTC3112. Substitution requires PCB layout revision and compensation network re-optimization due to differing FB reference, VC compensation behavior, and PROG functionality.
What is the maximum continuous output current the LTC3127EDD#PBF can deliver at 3.3V output with 3.6V input?
With VIN = 3.6V and VOUT = 3.3V, the LTC3127EDD#PBF delivers up to 1A continuous output current in PWM mode, provided thermal limits are respected (θJA = 43°C/W, TJMAX = 125°C). At lighter loads (<35mA), Burst Mode reduces IQ to 35μA but limits peak output current due to discontinuous conduction.
LTC3127EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Energy Harvesting
- Current - Supply:
- 400µA
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
LTC3127EDD#PBF FAQ
1.How can I place an order for LTC3127EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3127EDD#PBF 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 LTC3127EDD#PBF reliable?
The price and inventory of LTC3127EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3127EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3127EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3127EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3127EDD#PBF?
LTC3127EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3127EDD#PBF 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 LTC3127EDD#PBF?
For technical support, including LTC3127EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3127EDD#PBF requirements.
6.How does Aetrix verify that LTC3127EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3127EDD#PBF 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 LTC3127EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3127EDD#PBF?
All LTC3127EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3127EDD#PBF, 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 LTC3127EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3127EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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