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Analog Devices Inc. LTC3110IUF#TRPBF
- Part No.:
- LTC3110IUF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3110IUF#TRPBF.pdf
- Description:
- IC BATT CHG SUPERCAP 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,418
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Product details
Overview
LTC3110IUF#TRPBF from Analog Devices is a 2A bidirectional buck-boost DC/DC regulator with integrated supercapacitor charger and active voltage balancer. It operates across 0.1V–5.5V VCAP and 1.8V–5.25V VSYS ranges, supports autonomous charge-to-backup switchover, delivers ±1% backup voltage accuracy, and features 1.2MHz fixed-frequency switching. It is deployed in server RAID systems requiring seamless power failover to supercapacitor banks.
For engineers reviewing the LTC3110IUF#TRPBF datasheet, LTC3110IUF#TRPBF pinout, LTC3110IUF#TRPBF application, or LTC3110IUF#TRPBF equivalent, key selection criteria include bidirectional current capability (±2A), programmable ±2% charge current limit (125mA–2A), VMID-based active capacitor balancing, Burst Mode quiescent current (40µA), and thermal performance in the 4mm × 4mm QFN-24 package.
Technical Context
The LTC3110IUF#TRPBF implements a proprietary four-switch buck-boost topology with internal MOSFETs (SWA–SWD) and integrated current sensing via RSEN. Its control architecture enables continuous conduction mode transitions between charge (VSYS → VCAP) and backup (VCAP → VSYS) without inductor current discontinuity or VSYS rail collapse.
Directional operation is governed by DIR pin hysteresis (1.045V/1.095V thresholds), while MODE pin selects between fixed-frequency PWM (low-noise, high-efficiency) and Burst Mode (ultra-low IQ). The VMID buffer actively regulates mid-rail voltage for two-series supercapacitors, suspending charge if VMID deviates beyond ±2.6V at VCAP = 5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCAP Range | 0.1V to 5.5V - supports single-cell Li-ion, NiMH, or wide-range supercapacitor stacks |
| VSYS Range | 1.8V to 5.25V - matches common system rails including 3.3V and 5V logic domains |
| Max Bidirectional Current | 2A continuous - sustains full backup load during power loss without derating |
| Backup Voltage Accuracy | ±1% - ensures stable system supply under varying VCAP and load conditions |
| Burst Mode IQ | 40µA - extends supercapacitor hold-up time in low-power standby states |
| Switching Frequency | Fixed 1.2MHz - enables compact magnetics and reduces EMI filtering burden |
| Shutdown Current | 0.05–1µA - preserves stored energy during extended system off periods |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed PGND pad (Pin 25), rated for –40°C to +125°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAP (Pins 19, 20) | Bidirectional storage node | Connects to supercapacitor/battery bank; sinks current in backup, sources in charge |
| VSYS (Pins 10, 12) | Bidirectional system rail | Supplies system during backup; receives charge current during charging |
| DIR (Pin 4) | Mode direction control | Hysteresis-enabled input (1.045V/1.095V) that selects charge (high) or backup (low) |
| PROG (Pin 7) | Charge current programming | Resistor-to-SGND sets average IVSYS from 125mA to 2A with ±2% accuracy |
| VMID (Pin 21) | Active balancing output | Drives midpoint of two-series supercaps to maintain ≤±2.6V balance at 5V VCAP |
| FB (Pin 6) | VSYS feedback reference | Resistor divider sets regulated VSYS voltage (1.8V–5.25V) with 0.6V internal reference |
| FBVCAP (Pin 2) | End-of-charge threshold | Hysteresis-enabled input (1.061V/1.095V) programs final VCAP voltage up to 5.5V |
| SW1/SW2 (Pins 17–18 / 13–14) | Power switch nodes | Connect to buck-boost inductor; SW1 drives switches A/B, SW2 drives C/D |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous charge-to-backup switchover | Zero-latency transition triggered by DIR pin or external power-fail signal |
| Programmable charge current limit | 125mA–2A range set by single resistor (RPROG = 1.5kΩ–24.3kΩ) with ±2% tolerance |
| Integrated active capacitor balancer | VMID pin delivers ±300mA balancing current to equalize series supercapacitors |
| Burst Mode operation | Reduces no-load IQ to 40µA while maintaining regulation and fast wake-up response |
| Open-collector status outputs | CAPOK (VCAP OK), CHRG (charge active), CMPOUT (custom comparator) enable µC monitoring |
| Thermally enhanced QFN package | θJA = 37°C/W on 4-layer board; exposed PGND pad mandatory for rated thermal performance |
Applications
| Server RAID Power Backup | Industrial PLC Battery Switchover |
|---|---|
Use Scenario: Maintains write-cache integrity during AC mains failure in enterprise storage arrays. IC Role / Device Role / Timing Role: Bidirectional regulator charges 10F supercapacitor bank from 12V backplane, then delivers regulated 3.3V to RAID controller during outage. Use Value: Enables >10s hold-up time with ±1% VSYS stability and automatic switchover <200µs after power loss. |
Use Scenario: Preserves volatile memory and real-time clock during battery replacement in factory automation controllers. IC Role / Device Role / Timing Role: Charges primary Li-ion cell from 5V USB input, then supplies 3.3V system rail when main battery is disconnected. Use Value: Eliminates system reset via seamless transition and ±2% charge current accuracy for predictable recharge timing. |
| RF Transceiver Supercap Hold-up | Medical Portable Device Backup |
Use Scenario: Sustains LTE/5G baseband processor operation during brief battery disconnection in mobile infrastructure units. IC Role / Device Role / Timing Role: Regulates 5.25V VSYS from 2.7V–4.2V Li-ion, then backs up same rail using parallel 5F supercapacitors. Use Value: Delivers 2A peak backup current with <10mV VSYS ripple in PWM mode, meeting RF spectral mask requirements. |
Use Scenario: Powers critical sensor acquisition circuitry during battery swap in handheld diagnostic equipment. IC Role / Device Role / Timing Role: Charges backup supercapacitor from main battery, then maintains 1.8V digital core rail during hot-swap event. Use Value: Achieves <1µA shutdown current and 40µA Burst Mode IQ, extending usable hold-up time by 3× vs discrete solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77827AEWE+T | Single-direction (buck-only) charger + separate boost backup IC; requires dual IC solution | Lacks integrated bidirectional path and VMID balancing; needs external balancer for supercaps | Choose when cost sensitivity outweighs board space constraints and balancing is handled externally |
| TPS63802DSKR | Unidirectional buck-boost with no charge function; no PROG, FBVCAP, or VMID pins | Suitable only for fixed-rail backup; cannot program charge current or terminate charge autonomously | Choose only for non-rechargeable backup scenarios where VCAP is pre-charged and static |
Compared with MAX77827AEWE+T and TPS63802DSKR, the LTC3110IUF#TRPBF uniquely integrates bidirectional power flow, programmable charge termination, and active supercapacitor balancing in one QFN package-reducing BOM count by 2–3 components and eliminating external balancing circuitry.
Availability
LTC3110IUF#TRPBF is available at Aetrix Electronics and suitable for server RAID systems, industrial PLCs, and RF transceiver modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LTC3110IUF#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets.
The LTC3110 product line delivers highly integrated, thermally robust power management ICs for mission-critical backup applications-specifically engineered to replace discrete buck-boost + charger + balancer combinations in space-constrained, high-reliability systems.
FAQ
What is the maximum continuous current capability of the LTC3110IUF#TRPBF in backup mode?
The LTC3110IUF#TRPBF supports 2A continuous bidirectional current in both charge and backup modes. Its internal MOSFETs (SWA–SWD) and 4mm × 4mm QFN package with exposed PGND pad enable this rating at full junction temperature (125°C) with proper PCB thermal design. Peak current capability reaches 6A per switch, but sustained operation is specified at 2A.
How does the LTC3110IUF#TRPBF implement supercapacitor voltage balancing?
The LTC3110IUF#TRPBF uses its VMID pin to actively regulate the midpoint voltage of two-series supercapacitors. When VCAP = 5V, VMID is held to 2.5V ±2.6V; if deviation exceeds this window, charging is suspended until balance is restored. The IC delivers ±300mA balancing current and includes hysteresis to prevent oscillation during recovery.
Can the LTC3110IUF#TRPBF operate with VCAP below 1V?
Yes-the LTC3110IUF#TRPBF supports VCAP down to 0.1V in backup mode and 1.8V in charge-start conditions. Its proprietary switching algorithm maintains regulation even when VCAP is significantly lower than VSYS (e.g., 0.5V VCAP → 3.3V VSYS), enabling deep discharge utilization of supercapacitors and extending hold-up time.
What is the role of the PROG pin on the LTC3110IUF#TRPBF?
The PROG pin on the LTC3110IUF#TRPBF sets the average charge current (IVSYS) by connecting a resistor to SGND. With RPROG = 1.5kΩ–24.3kΩ, it programs 125mA–2A with ±2% accuracy. The IC uses 200µA/A gain, so 2A corresponds to 400µA into PROG-enabling precise, resistor-based current limiting without external sense amplifiers.
Does the LTC3110IUF#TRPBF require external compensation components?
No-the LTC3110IUF#TRPBF integrates all compensation circuitry internally. Its voltage-mode control loop for VSYS regulation and proprietary algorithm for VCAP/VSYS ratio management eliminate the need for external compensation networks. Only standard input/output capacitors and the buck-boost inductor are required for full operation.
LTC3110IUF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Battery Chemistry:
- Supercapacitor
- Number of Cells:
- -
- Current - Charging:
- -
- Programmable Features:
- -
- Fault Protection:
- Over Temperature, Over Voltage
- Charge Current - Max:
- -
- Battery Pack Voltage:
- -
- Voltage - Supply (Max):
- 5.5V
- Interface:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3110IUF#TRPBF FAQ
1.How can I place an order for LTC3110IUF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3110IUF#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 LTC3110IUF#TRPBF reliable?
The price and inventory of LTC3110IUF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3110IUF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3110IUF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3110IUF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3110IUF#TRPBF?
LTC3110IUF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3110IUF#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 LTC3110IUF#TRPBF?
For technical support, including LTC3110IUF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3110IUF#TRPBF requirements.
6.How does Aetrix verify that LTC3110IUF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3110IUF#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 LTC3110IUF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3110IUF#TRPBF?
All LTC3110IUF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3110IUF#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 LTC3110IUF#TRPBF part is unused and in its original packaging.
Return procedure for LTC3110IUF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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