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Analog Devices Inc. LTC3125EDCB#TRMPBF
- Part No.:
- LTC3125EDCB#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3125EDCB#TRMPBF.pdf
- Description:
- IC REG BOOST ADJ 1.2A 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,142
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Product details
Overview
LTC3125EDCB#TRMPBF from Analog Devices (formerly Linear Technology) is a synchronous step-up DC/DC converter with programmable average input current limit, designed for GSM/GPRS pulsed-load applications. It operates from 1.8V to 5.5V input, delivers up to 5.25V output, features 1.6MHz fixed-frequency switching, 1.2A peak switch current limit, and achieves up to 93% efficiency in compact DFN packaging.
For engineers reviewing the LTC3125EDCB#TRMPBF datasheet, LTC3125EDCB#TRMPBF pinout, LTC3125EDCB#TRMPBF application, or LTC3125EDCB#TRMPBF equivalent, key selection criteria include input current limit accuracy (±5% at 500mA), output disconnect capability, Burst Mode® quiescent current (15μA), and compatibility with PCMCIA/CompactFlash power bus constraints under high-current burst loads.
Technical Context
The LTC3125EDCB#TRMPBF uses current-mode PWM control with internal slope compensation and adaptive loop stability optimized for >150μF low-ESR output capacitors-critical for supercapacitor charging and GSM pulse support. Its dual current limiting includes a 1.2A peak switch current clamp and a resistor-programmable average input current limit (200–1000mA range) with 5% accuracy at 500mA.
Operation supports VIN > VOUT regulation, output disconnect during shutdown (preventing body diode conduction), and automatic transition between fixed-frequency PWM and Burst Mode® based on load. Internal N-channel and P-channel MOSFETs feature RDS(ON) of 0.125Ω and 0.200Ω respectively at VOUT = 3.3V, enabling high efficiency across light-to-heavy loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and PCMCIA 3.3V bus inputs |
| Output Voltage Range | 2.0V to 5.25V - adjustable via external FB divider; enables 4.5V GSM modem rail |
| Avg Input Current Limit | 200mA to 1000mA - set by PROG pin resistor; ±5% accuracy at 500mA ensures safe slot power compliance |
| Switching Frequency | 1.6MHz (typ) - enables use of small 2.2–4.7μH inductors and reduces solution footprint |
| Peak Switch Current | 1.2A (min), 1.8A (typ) - limits inductor stress and thermal rise during GSM 2A pulse bursts |
| Efficiency | Up to 93% - achieved via synchronous rectification and low RDS(ON) internal MOSFETs |
| Quiescent Current (Burst) | 15μA (typ) - extends battery life in standby modes of portable radios and emergency locators |
Pinout & Package
Package: 8-lead (2mm × 3mm × 0.75mm) plastic DFN with exposed pad (Pin 9 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 9) | Ground reference and thermal path | Exposed pad (Pin 9) must be soldered to PCB ground plane; failure degrades θJA beyond 64°C/W |
| FB (Pin 2) | Feedback voltage sense input | Connects to resistor divider; regulates VOUT from 2V to 5.25V with 1.200V (typ) reference |
| PROG (Pin 3) | Average input current programming | Sinks current proportional to sensed input current; sets limit via external RPROG (e.g., 22.6kΩ = ~1A) |
| VIN (Pin 4) | Main input supply | Power source until VOUT > VIN + 0.25V; connects internally to CS via 60mΩ sense resistor |
| CS (Pin 5) | Current sense node | Connects directly to inductor; internal 60mΩ sense element enables lossless input current monitoring |
| SHDN (Pin 6) | Logic-controlled enable/disable | Active-high: >1V enables; <0.35V disables; supports logic-level control without level shifting |
| VOUT (Pin 7) | Regulated output and sync rectifier drain | Provides output disconnect in shutdown; no reverse current flow when SHDN = low |
| SW (Pin 8) | Power switch node | Connects to inductor; internal anti-ringing resistor suppresses EMI during DCM operation |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input current limit | 200–1000mA range with ±5% accuracy at 500mA - ensures PCMCIA/CompactFlash slot current compliance |
| Output disconnect in shutdown | VOUT fully isolates from VIN; eliminates standby leakage and enables safe VOUT pull-up |
| Burst Mode® operation | Reduces quiescent current to 15μA at light loads while maintaining regulation - critical for battery-powered emergency locators |
| Internal current sense resistor | 60mΩ integrated between VIN and CS - eliminates external sense resistor, saving board space and BOM cost |
| Thermal and short-circuit protection | Thermal shutdown at ~160°C; peak current limit reduced to 800mA during short-circuit - prevents damage under fault conditions |
Applications
| GSM/GPRS PCMCIA Modem Power | Wireless Emergency Locator Supply |
|---|---|
Use Scenario: Powering GSM/GPRS modems in notebook PCs using PCMCIA or CompactFlash slots with strict 500mA–1000mA input current limits. IC Role / Device Role / Timing Role: Synchronous boost converter providing regulated 4.5V output while enforcing precise average input current limit during 2A/577μs transmission bursts. Use Value: Enables direct interface to legacy bus power without overloading; bulk capacitor + LTC3125EDCB#TRMPBF sustains output voltage during pulses while keeping slot current within spec. | Use Scenario: Long-life battery operation in GPS-enabled personal emergency beacons requiring ultra-low quiescent current and reliable pulsed-load response. IC Role / Device Role / Timing Role: High-efficiency step-up regulator delivering stable 3.3V or 4.5V to RF transceiver during brief transmission windows, then entering deep-sleep Burst Mode®. Use Value: 15μA Burst Mode® quiescent current extends lithium primary battery life; output disconnect prevents battery drain when device is idle. |
| Portable Radio Transmitter Rail | Supercapacitor Charging Interface |
Use Scenario: Providing regulated 5V rail for UHF/VHF handheld radios that draw high-current transmit bursts but require low-noise receive-mode operation. IC Role / Device Role / Timing Role: Synchronous boost converter with soft-start and fast transient response, supporting rapid transition between low-power receive and high-current transmit states. Use Value: Internal compensation and 1.6MHz switching minimize output filtering; zero-current comparator improves light-load efficiency during receive mode. | Use Scenario: Charging single or stacked supercapacitors from 2.5–5V sources in energy-harvesting or backup power systems. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger using average input current limit as proxy for controlled charge current into supercap bank. Use Value: Stable operation with >150μF output capacitance; VIN > VOUT capability allows charging from partially discharged sources (e.g., 3.3V → 2.5V supercap). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17222ETA+T | Fixed 500mA input current limit; no programmability; 1.2MHz switching; smaller 2mm × 2mm TDFN | Lacks resistor-programmable input current limit - unsuitable for variable GSM Class 10 (800mA) requirements | Select only if fixed 500mA limit suffices and footprint reduction is prioritized over flexibility |
| TPS61099YFFR | 1.8V–5.5V input; 5.5V max output; 1.2A switch current; no input current limit function; 1.2MHz | No average input current regulation - cannot enforce PCMCIA slot current compliance during GSM bursts | Use where input current limiting is unnecessary and higher output voltage (5.5V) is required |
Compared with MAX17222ETA+T and TPS61099YFFR, the LTC3125EDCB#TRMPBF uniquely provides resistor-programmable average input current limiting with ±5% accuracy - essential for GSM/GPRS modem integration into power-constrained PC Card interfaces, while maintaining 1.6MHz operation and output disconnect.
Availability
LTC3125EDCB#TRMPBF is available at Aetrix Electronics and suitable for GSM modem power supplies, wireless emergency locator systems, portable radio transmitter rails, and supercapacitor charging circuits requiring stable component supply and long-term industrial availability.
Supply support for LTC3125EDCB#TRMPBF 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 company specializes in precision signal conditioning, power conversion, and RF solutions for demanding industrial and communications applications.
The LTC3125EDCB#TRMPBF belongs to Linear's high-efficiency synchronous boost converter product line, engineered specifically for pulsed-load applications such as GSM/GPRS modems, where precise input current limiting and output disconnect are mandatory for host-bus compatibility.
FAQ
What is the guaranteed accuracy of the input current limit for LTC3125EDCB#TRMPBF?
The LTC3125EDCB#TRMPBF guarantees ±5% accuracy of the average input current limit at the 500mA setting. Accuracy degrades slightly at other settings due to internal loop offsets and external RPROG tolerance; for critical applications, 0.1% resistors are recommended. The LTC3125EDCB#TRMPBF datasheet specifies 475–525mA for RPROG = 44.2kΩ at TA = 25°C.
Does LTC3125EDCB#TRMPBF support operation when input voltage exceeds output voltage?
Yes, the LTC3125EDCB#TRMPBF supports VIN > VOUT operation and maintains regulation, though efficiency and maximum output current decrease. This mode is explicitly validated in the datasheet and used in applications like supercapacitor charging where input may drop below target output during discharge cycles. The LTC3125EDCB#TRMPBF does not require external components to enable this behavior.
How does LTC3125EDCB#TRMPBF achieve output disconnect during shutdown?
The LTC3125EDCB#TRMPBF achieves true output disconnect by actively controlling its internal P-channel MOSFET synchronous rectifier to prevent body diode conduction. When SHDN is pulled low, VOUT is isolated from VIN, allowing VOUT to discharge freely and eliminating reverse current. This requires no external Schottky diode - adding one defeats the LTC3125EDCB#TRMPBF's output disconnect functionality.
What is the minimum output capacitance required for stable operation of LTC3125EDCB#TRMPBF?
The LTC3125EDCB#TRMPBF requires ≥150μF output capacitance with low ESR for stable operation, especially under pulsed loads. Output capacitors below this value degrade transient response and risk instability due to insufficient phase margin in the internally compensated loop. The LTC3125EDCB#TRMPBF datasheet validates stability with 1500μF tantalum or supercapacitor banks, not ceramic-only solutions.
Can LTC3125EDCB#TRMPBF be used in Burst Mode® with very light loads?
Yes, the LTC3125EDCB#TRMPBF automatically enters Burst Mode® at light loads, reducing quiescent current to 15μA (typ) while maintaining tight output regulation. Burst Mode® threshold varies with VIN and inductor value; increasing inductance lowers the threshold. The LTC3125EDCB#TRMPBF transitions seamlessly between Burst Mode® and fixed-frequency PWM without output transients, ensuring robust performance across all load conditions.
LTC3125EDCB#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2V
- Voltage - Output (Max):
- 5.25V
- Current - Output:
- 1.2A (Switch)
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x3)
LTC3125EDCB#TRMPBF FAQ
1.How can I place an order for LTC3125EDCB#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3125EDCB#TRMPBF 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 LTC3125EDCB#TRMPBF reliable?
The price and inventory of LTC3125EDCB#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3125EDCB#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3125EDCB#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3125EDCB#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3125EDCB#TRMPBF?
LTC3125EDCB#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3125EDCB#TRMPBF 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 LTC3125EDCB#TRMPBF?
For technical support, including LTC3125EDCB#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3125EDCB#TRMPBF requirements.
6.How does Aetrix verify that LTC3125EDCB#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3125EDCB#TRMPBF 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 LTC3125EDCB#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3125EDCB#TRMPBF?
All LTC3125EDCB#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3125EDCB#TRMPBF, 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 LTC3125EDCB#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3125EDCB#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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