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Analog Devices Inc. LTC3127EDD#TRPBF
- Part No.:
- LTC3127EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3127EDD#TRPBF.pdf
- Description:
- IC DCDC CONV BUCK BOOST 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,570
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Product details
Overview
LTC3127EDD#TRPBF from Analog Devices (formerly Linear Technology) is a 1.35MHz 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#TRPBF datasheet, LTC3127EDD#TRPBF pinout, LTC3127EDD#TRPBF application, or LTC3127EDD#TRPBF equivalent, key selection criteria include its 10-lead 3mm × 3mm DFN package, input-current-limited operation under weak sources, Burst Mode® quiescent current of 35μA, and thermal regulation that dynamically reduces current limit above 130°C to prevent shutdown.
Technical Context
The LTC3127EDD#TRPBF implements a proprietary four-switch buck-boost topology with continuous transfer function across all operating modes-no discontinuity in inductor current or loop characteristics during transitions between buck, buck-boost, and boost. Its average input current mode control uses an outer voltage loop (externally compensated via VC pin) and an inner current loop (internally compensated) to enforce precise input current limiting independent of output load.
It features dual-mode operation: forced PWM (MODE = low) for low-noise fixed-frequency switching, and pin-selectable Burst Mode® (MODE = high) enabling 35μA quiescent current at light loads while maintaining regulation. Thermal regulation activates at ~130°C to scale back input current limit before thermal shutdown (~150°C) engages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, USB, or wide-input industrial rails without pre-regulation. |
| Output Voltage Range | 1.8V to 5.25V - adjustable via external resistor divider; feedback reference is 1.195V ±30mV. |
| Switching Frequency | 1.35MHz fixed - enables use of compact 2.2–4.7µH inductors and reduces output ripple frequency. |
| Input Current Limit Accuracy | ±4% over –40°C to 85°C - set by single PROG-pin resistor; validated at 0.5A (RPROG = 32.4kΩ). |
| Peak Efficiency | 96% - achieved with synchronous rectification and low RDS(ON) MOSFETs (SWA/SWD: 160–190mΩ; SWB/SWC: 140–170mΩ). |
| Quiescent Current (Burst Mode) | 35μA - enables >10-year battery life in always-on sensor nodes powered from coin cells or energy harvesters. |
| Shutdown Current | <1μA - ensures minimal leakage when system is off; SHDN pin threshold is 0.3V low / 1.2V high. |
Pinout & Package
Package: 10-lead (3mm × 3mm × 0.75mm) plastic DFN with exposed PGND pad (Pin 11), thermally enhanced for θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Switch node A/B connection | Connects to one end of inductor; high di/dt path requiring minimized trace length and tight loop area to reduce EMI. |
| VIN (Pin 2) | Main input supply and internal VCC rail | Requires ≥10µF ceramic capacitor placed adjacent to VIN and PGND for stable bias and transient response. |
| SHDN (Pin 3) | Logic-controlled enable/disable | Active-high; drives device into <1μA shutdown state when pulled low; tolerates voltages up to 6V. |
| MODE (Pin 4) | Burst Mode® / PWM mode select | High = automatic Burst Mode®; Low = forced continuous conduction PWM only - critical for noise-sensitive applications. |
| PROG (Pin 5) | Average input current limit programming | Resistor to SGND sets limit (0.2–1A); formula: RPROG = 54.92·ILIMIT(A) + 4.94kΩ. |
| SGND (Pin 6) | Signal ground reference | Reference point for PROG resistor, FB divider, and compensation network - must be star-connected to avoid noise coupling. |
| FB (Pin 7) | Feedback input | Monitors output via resistive divider; internal 1.195V reference enables precise output voltage setting from 1.8V to 5.25V. |
| VC (Pin 8) | Error amplifier output | External compensation node; supports proportional or integral compensation depending on output capacitance (≥1000µF → proportional recommended). |
| VOUT (Pin 9) | Regulated output | Delivers final output; requires ≥22µF low-ESR capacitor directly to PGND; output disconnect occurs in shutdown. |
| SW2 (Pin 10) | Switch node C/D connection | Connects to other end of inductor; same EMI mitigation requirements as SW1. |
| PGND (Pin 11) | Power ground (exposed pad) | Primary return path for high-current switches; must be soldered to large PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input current limit | 0.2A–1A with ±4% accuracy over temperature - enables reliable operation from current-limited sources like USB ports or energy harvesters. |
| Seamless tri-mode operation | No discontinuity in inductor current or control loop during buck → buck-boost → boost transitions - eliminates output glitches and improves stability. |
| Thermal regulation | Dynamically reduces input current limit starting at ~130°C - prevents thermal shutdown during high-power charging of large capacitive loads. |
| Reverse current protection | 300mA typical reverse-current limit on SW2 - blocks backfeed from output to input when VOUT > VVIN, protecting upstream sources. |
| Zero-current detection | Shuts off synchronous rectifier at ~30mA inductor current - prevents reverse conduction and improves light-load efficiency in Burst Mode®. |
Applications
| USB Powered GSM Modems | Supercapacitor Chargers |
|---|---|
Use Scenario: GSM modem draws pulsed 1.5A transmit bursts from USB 5V source while maintaining 3.3V logic rail. IC Role / Device Role / Timing Role: Buck-boost regulator with programmable 500mA input current limit enforces USB compliance while sustaining regulated 3.3V output during deep VIN dips. Use Value: Prevents host port overcurrent shutdown; enables use of small 4.7µH inductor and 2.2mF low-ESR output cap to meet 300mV droop spec under 217Hz 12.5% duty cycle pulses. | 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: Input-current-limited buck-boost converter delivering constant 0.5A charge current until VCAP reaches 2.5V, then regulating output voltage. Use Value: Thermal regulation scales current limit as die temperature rises, avoiding thermal runaway during bulk charge phase; output disconnect in shutdown prevents capacitor self-discharge. |
| Handheld Test Instruments | Wireless Terminals |
Use Scenario: Portable multimeter with LCD, microcontroller, and analog front-end powered from two AA batteries (1.8–3.2V) requiring stable 3.0V rail. IC Role / Device Role / Timing Role: Wide-input buck-boost maintains 3.0V output across full battery discharge curve, using Burst Mode® to extend runtime. Use Value: 35μA quiescent current in Burst Mode® enables multi-year shelf life; seamless mode transitions prevent display flicker or ADC measurement errors during battery sag. | Use Scenario: Industrial handheld terminal with Bluetooth LE and OLED display operating from 3.3V–5.5V input with variable load profile. IC Role / Device Role / Timing Role: Regulates 3.3V system rail from either USB or Li-ion; MODE pin selects PWM for low-noise RF section or Burst Mode® for standby. Use Value: Pin-selectable operation allows dynamic trade-off between EMI (PWM) and battery life (Burst Mode®); <1μA shutdown current enables instant wake-up from deep sleep. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3V/5V outputs only; no programmable input current limit; 2.5MHz switching; lower max IOUT (3A vs 1A continuous). | Best for cost-sensitive, fixed-output systems without current-limiting requirements; lacks thermal regulation and reverse-current blocking. | Select TPS63020DSJR only if output voltage is fixed and input current limiting is unnecessary. |
| MAX77827BEWL+T | Supports programmable input current limit (0.5–3A) but requires I2C interface; 2.2MHz; integrated load switch; no Burst Mode®. | Suitable for systems needing digital configuration and sequencing; higher quiescent current (50μA) limits ultra-low-power use cases. | Choose MAX77827BEWL+T when I2C control, load switching, or wider current range outweighs need for sub-40μA quiescent operation. |
Compared with TPS63020DSJR and MAX77827BEWL+T, the LTC3127EDD#TRPBF uniquely combines analog-programmable input current limiting, sub-40μA Burst Mode® operation, thermal regulation, and seamless tri-mode transition - making it optimal for energy-constrained, thermally sensitive, or USB-compliant portable designs where deterministic current control is mandatory.
Availability
LTC3127EDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered modems, supercapacitor chargers, and handheld test instruments requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LTC3127EDD#TRPBF 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 power management portfolio with rigorous characterization and long-term product commitments.
The LTC3127 belongs to Linear's precision buck-boost converter family, designed specifically for applications demanding regulated output from unpredictable or current-limited inputs - such as energy harvesting, battery-powered instrumentation, and USB-compliant peripherals.
FAQ
What is the maximum continuous output current capability of the LTC3127EDD#TRPBF?
The LTC3127EDD#TRPBF delivers 0.6A continuous output current when VIN > 1.8V, and up to 1A continuous output current when VIN > 3V. This is enabled by its low RDS(ON) synchronous MOSFETs (140–190mΩ) and thermally enhanced 3mm × 3mm DFN package. Peak inductor current capability remains 2.5A regardless of input voltage.
How does the LTC3127EDD#TRPBF implement input current limiting, and what is its accuracy?
The LTC3127EDD#TRPBF uses an average input current limit circuit that clamps the outer voltage loop's error amplifier output. The limit is set by a resistor from PROG to SGND, with accuracy of ±4% over –40°C to 85°C. For example, a 32.4kΩ resistor programs a nominal 500mA limit, verified at 465–540mA across temperature.
Can the LTC3127EDD#TRPBF operate with input voltage below the output voltage?
Yes - the LTC3127EDD#TRPBF is a true buck-boost converter that regulates its output whether VIN is above, below, or equal to VOUT. When VIN < VOUT, it operates in pure boost mode with switch A continuously on and CD pair PWM-controlled. Its proprietary algorithm ensures continuous inductor current and stable loop behavior across all three modes.
What compensation topology is recommended for the LTC3127EDD#TRPBF's VC pin?
Proportional compensation is recommended for output capacitances ≥1000µF, using a single resistor (e.g., 499kΩ) from VC to SGND. Integral compensation is required for 44µF–1000µF output caps and must keep total network bandwidth below 15kHz. The LTC3127EDD#TRPBF's inner current loop eliminates one double pole, simplifying stability design compared to conventional buck-boost ICs.
Does the LTC3127EDD#TRPBF provide reverse current protection, and how does it work?
Yes - the LTC3127EDD#TRPBF includes a reverse current comparator monitoring switch D. When inductor current sourced from VOUT exceeds ~300mA, switch D turns off for the remainder of the switching cycle, preventing backfeed into the input. This protects upstream sources like batteries or USB ports during fault conditions or sudden input loss.
LTC3127EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3127EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3127EDD#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3127EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3127EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3127EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3127EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3127EDD#TRPBF?
LTC3127EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3127EDD#TRPBF 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#TRPBF?
For technical support, including LTC3127EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3127EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3127EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3127EDD#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3127EDD#TRPBF?
All LTC3127EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3127EDD#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3127EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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