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Analog Devices Inc. LTC3110IUF#PBF
- Part No.:
- LTC3110IUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3110IUF#PBF.pdf
- Description:
- IC BATT CHG SUPERCAP 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,203
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Product details
Overview
LTC3110IUF#PBF from Analog Devices is a 2A bidirectional buck-boost DC/DC regulator with integrated capacitor charger and active balancing buffer. It operates across 0.1V–5.5V VCAP and 1.8V–5.25V VSYS ranges, supports ±1% backup voltage accuracy and ±2% programmable charge current (125mA–2A), and delivers up to 95% efficiency in PWM mode - enabling reliable supercapacitor-based backup for RAID systems and RF infrastructure.
For engineers reviewing the LTC3110IUF#PBF datasheet, LTC3110IUF#PBF pinout, LTC3110IUF#PBF application, or LTC3110IUF#PBF equivalent, key selection criteria include bidirectional current control, VMID-based capacitor balancing, Burst Mode quiescent current (40µA), shutdown current (<1µA), and compatibility with 4mm × 4mm QFN-24 thermal layout requirements.
Technical Context
The LTC3110IUF#PBF implements a proprietary four-switch buck-boost topology with internal MOSFETs (SWA–SWD) and integrated current sensing via RSEN. Its direction control is managed by DIR pin hysteresis (1.045V/1.095V thresholds), while MODE pin selects between fixed 1.2MHz PWM operation or low-noise Burst Mode (40µA IQ).
It features dual feedback loops: FB regulates VSYS output (0.6V reference) and FBVCAP sets end-of-charge threshold (1.061V/1.095V hysteresis); VMID provides active linear balancing for series supercapacitors, suspending charge if VMID deviates >±120mV from 0.5×VCAP when VCAP > 2.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Four-switch synchronous bidirectional buck-boost with integrated power switches |
| Max Continuous Current | 2A bidirectional output - supports both charging (VSYS→VCAP) and backup (VCAP→VSYS) paths |
| VCAP Range | 0.1V to 5.5V - enables single-cell Li-ion, multi-cell supercaps, or hybrid storage configurations |
| VSYS Regulation Accuracy | ±1% over –40°C to 125°C - ensures stable system rail during brownout recovery |
| Charge Current Programmability | ±2% accuracy from 125mA to 2A via PROG resistor - enables precise thermal and lifetime management of backup capacitors |
| Switching Frequency | Fixed 1.2MHz (PWM mode) - allows compact 1.5µH inductor and low-profile ceramic output caps |
| Quiescent Current | 40µA in Burst Mode, <1µA in shutdown - extends hold-up time in battery-backed systems |
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 and θJA = 37°C/W on 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAP (Pins 19,20) | Bidirectional energy storage interface | Connects to supercapacitor/battery stack; sinks current in backup mode, sources in charge mode |
| VSYS (Pins 10,12) | System supply rail interface | Provides regulated backup voltage or accepts charge input; requires ≥47µF local bypass |
| VMID (Pin 21) | Active capacitor balancing output | Drives midpoint of series supercaps; suspends charging if deviation exceeds ±120mV from 0.5×VCAP |
| DIR (Pin 4) | Mode direction control input | Hysteresis thresholds (1.045V/1.095V) enable robust transition between charge/backup without chatter |
| PROG (Pin 7) | Charge current programming node | Resistor to SGND sets average IVSYS with 200µA/A gain; supports 125mA–2A range |
| FB (Pin 6) | VSYS output voltage feedback | 0.6V reference; resistor divider from VSYS sets regulated output between 1.8V and 5.25V |
| FBVCAP (Pin 2) | Capacitor end-of-charge monitor | Hysteresis thresholds (1.061V/1.095V) trigger charge foldback and termination |
| SW1/SW2 (Pins 17–18 / 13–14) | Power switch nodes | Connect to inductor terminals; require short, wide PCB traces to minimize EMI and switching losses |
| PGND (Pins 15,16,25) | High-current ground return | Exposed pad must be soldered to solid thermal plane; separates high di/dt paths from SGND |
| SGND (Pin 3) | Analog signal reference | Isolated Kelvin connection point for FB, FBVCAP, CMPIN - prevents noise coupling into feedback loops |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous charge-to-backup switchover | Direction reversal occurs within 200µs upon DIR pin transition - critical for seamless power failure response in telecom base stations |
| Integrated VMID balancing buffer | Linear regulator actively maintains 0.5×VCAP at series capacitor midpoint - eliminates need for external passive balancing resistors |
| Programmable charge current limit | 200µA/A gain at PROG pin enables precise current setting with standard 1% resistors - avoids over-stressing supercapacitors |
| Burst Mode operation | Reduces no-load IQ to 40µA while maintaining regulation - extends backup hold-up time by >3× vs PWM mode at light loads |
| Open-collector status outputs | CAPOK, CHRG, CMPOUT provide direct µC interfacing without level-shifting - simplifies system monitoring and fault logging |
Applications
| RAID Controller Backup | RF Power Amplifier Hold-Up |
|---|---|
Use Scenario: Maintains write-cache integrity during AC mains loss in enterprise storage arrays using 10F supercapacitor stacks. IC Role / Device Role / Timing Role: Bidirectional buck-boost regulator and charger managing energy flow between 3.3V system rail and 5.5V supercap bank. Use Value: Enables >10-second clean shutdown with ±1% VSYS regulation and automatic capacitor balancing to prevent overvoltage failure. | Use Scenario: Provides uninterrupted bias voltage to GaN RF PAs during brief grid interruptions in 5G macro base stations. IC Role / Device Role / Timing Role: Backup converter sourcing 2A at 28V from 48V supercap bank, with fast DIR-triggered mode transition. Use Value: Delivers 95% efficiency at full load and <40µA standby current - extends operational uptime without increasing thermal footprint. |
| Industrial PLC Memory Retention | Medical Imaging System UPS |
Use Scenario: Preserves volatile configuration data in programmable logic controllers during 200ms utility dips using dual 5F supercaps. IC Role / Device Role / Timing Role: Charger/balancer ensuring matched capacitor voltages during recharge, then backup regulator sustaining 5V/1A system rail. Use Value: VMID-based active balancing eliminates passive resistor networks - reduces BOM cost and leakage-induced capacity loss. | Use Scenario: Supplies hold-up power to FPGA and ADC subsystems in portable MRI scanners during battery swap events. IC Role / Device Role / Timing Role: Bidirectional converter interfacing 3.6V Li-ion pack and 1.8V/3.3V digital rails with independent FB and FBVCAP feedback. Use Value: Dual feedback architecture enables independent optimization of backup accuracy (±1%) and charge termination precision (±2%). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional buck-boost charger applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX77827AEWE+T | Single-direction buck-boost charger (VCAP→VSYS only); no VMID balancing; 1.5A max current | Lacks autonomous backup mode and capacitor balancing - requires external circuitry for supercap stack management | Select when only charging functionality is needed and system-level balancing is handled externally |
| BQ24650RGER | Dedicated battery charger IC (no backup capability); supports Li-ion only; no VCAP range below 2.5V | Cannot operate down to 0.1V VCAP - unsuitable for supercapacitor-based hold-up with deep discharge | Select for primary Li-ion battery charging where backup conversion is implemented separately |
Compared with MAX77827AEWE+T and BQ24650RGER, the LTC3110IUF#PBF uniquely integrates bidirectional energy transfer, active supercapacitor balancing, and sub-1V VCAP operation - making it the only solution requiring no external components to implement autonomous charge/backup with matched capacitor stacks.
Availability
LTC3110IUF#PBF is available at Aetrix Electronics and suitable for RAID systems, RF infrastructure, industrial PLCs, medical imaging UPS, and telecom base station backup requiring stable component supply across extended temperature and long-lifecycle programs.
Supply support for LTC3110IUF#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3110 product line was designed specifically for high-reliability energy buffering applications requiring seamless bidirectional power flow, precise charge control, and active supercapacitor balancing - targeting mission-critical backup in data centers and wireless infrastructure.
FAQ
What is the maximum supported VCAP voltage for LTC3110IUF#PBF in backup operation?
The LTC3110IUF#PBF supports a VCAP operating range of 0.1V to 5.5V in backup mode, verified per Absolute Maximum Ratings and Electrical Characteristics tables. This enables use with single-cell Li-ion batteries (up to 4.2V) or stacked supercapacitors (e.g., two 2.7V units). Operation above 5.5V risks permanent damage per datasheet Section "Absolute Maximum Ratings".
How does the VMID pin function in LTC3110IUF#PBF during supercapacitor charging?
In LTC3110IUF#PBF, the VMID pin delivers active linear balancing current to maintain the midpoint voltage of series-connected supercapacitors at exactly 0.5×VCAP. If deviation exceeds ±120mV (e.g., due to capacitance mismatch), charging suspends until balance is restored - preventing overvoltage failure. This occurs only when VCAP > 2.2V, as specified in the "Operation" section.
Can LTC3110IUF#PBF operate with VSYS below 1.8V?
No - the LTC3110IUF#PBF requires VSYS ≥ 1.8V for charge operation and ≥ 1.71V for undervoltage lockout release, per Electrical Characteristics table. Below 1.71V, the device remains in UVLO state and disables switching. For sub-1.8V system rails, an external boost stage is required before VSYS input.
What is the purpose of the PROG pin on LTC3110IUF#PBF, and how is charge current set?
The PROG pin on LTC3110IUF#PBF sets average charge current (IVSYS) via an external resistor to SGND. With 200µA/A gain, a 3.01kΩ resistor programs 2A (602µA × 5A/V), supporting 125mA–2A range. Accuracy depends on resistor tolerance and temperature stability, as noted in datasheet Note 8.
Does LTC3110IUF#PBF support automatic transition between charge and backup modes without µC intervention?
Yes - LTC3110IUF#PBF supports autonomous mode transition via the DIR pin's hysteresis (1.045V/1.095V thresholds). When system voltage drops below the falling threshold, it automatically enters backup mode; rising above the threshold resumes charging. This eliminates µC polling and enables sub-millisecond response to power failures.
LTC3110IUF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC3110IUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3110IUF#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 LTC3110IUF#PBF reliable?
The price and inventory of LTC3110IUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3110IUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3110IUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3110IUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3110IUF#PBF?
LTC3110IUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3110IUF#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 LTC3110IUF#PBF?
For technical support, including LTC3110IUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3110IUF#PBF requirements.
6.How does Aetrix verify that LTC3110IUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3110IUF#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 LTC3110IUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3110IUF#PBF?
All LTC3110IUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3110IUF#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 LTC3110IUF#PBF part is unused and in its original packaging.
Return procedure for LTC3110IUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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