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Analog Devices Inc. LTC3110HUF#PBF
- Part No.:
- LTC3110HUF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Battery Chargers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LTC3110HUF#PBF.pdf
- Description:
- IC BATT CHG SUPERCAP 24QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,788
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Product details
Overview
LTC3110HUF#PBF from Analog Devices is a 2A bidirectional buck-boost DC/DC regulator with integrated supercapacitor charger and active balancing. It operates across 0.1V–5.5V VCAP and 1.8V–5.25V VSYS ranges, delivers ±1% backup voltage accuracy, supports automatic charge-to-backup switchover, and features 1.2MHz fixed-frequency switching-enabling robust power backup in servers, RAID systems, and RF infrastructure.
For engineers reviewing the LTC3110HUF#PBF datasheet, LTC3110HUF#PBF pinout, LTC3110HUF#PBF application, or LTC3110HUF#PBF equivalent, key selection criteria include bidirectional current capability, programmable ±2% charge current limit (125mA–2A), thermal rating up to 150°C junction, Burst Mode® quiescent current (40µA), and QFN-24 package compatibility with high-density PCB layouts.
Technical Context
The LTC3110HUF#PBF implements a proprietary four-switch buck-boost topology with internal MOSFETs (SWA–SWD) and integrated current sensing via RSEN. Its control architecture enables seamless mode transitions without inductor current discontinuity, supporting both charging (VSYS → VCAP) and backup (VCAP → VSYS) with independent voltage regulation on each rail.
It integrates dual feedback loops: FB for VSYS output regulation (0.6V reference) and FBVCAP for end-of-charge threshold (1.095V rising, 1.040V falling), plus VMID-based active capacitor balancing with ±150mA balancing current capability and suspend-charging hysteresis at 2.4V–2.62V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Current | 2A continuous bidirectional current-supports full-system backup load in telecom and storage applications. |
| VCAP Operating Range | 0.1V to 5.5V-enables direct interface with single or stacked supercapacitors without external level-shifting. |
| VSYS Backup Range | 1.8V to 5.25V-covers standard logic rails (1.8V, 2.5V, 3.3V, 5V) and ensures compatibility with server motherboard standby domains. |
| Backup Voltage Accuracy | ±1% over –40°C to 150°C-guarantees stable system voltage during brownout recovery without software calibration. |
| Switching Frequency | Fixed 1.2MHz-minimizes external component size while maintaining low EMI in noise-sensitive RF subsystems. |
| Burst Mode Quiescent Current | 40µA-extends hold-up time in battery-backed systems by reducing standby loss during long idle periods. |
| Shutdown Current | ≤1µA-preserves stored energy in supercapacitors during extended system off-states. |
Pinout & Package
Package: 24-lead (4mm × 4mm) plastic QFN with exposed thermal pad (PGND), rated for –40°C to +150°C operating junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCAP (Pins 19,20) | Bidirectional storage element interface | Connects directly to supercapacitor stack anode/cathode; supports 0.1V–5.5V operation and active balancing via VMID. |
| VSYS (Pins 10,12) | System backup rail I/O | Delivers regulated backup power or accepts charge input; requires local 47µF bypass and RC filtering on SVSYS. |
| PROG (Pin 7) | Charge current programming node | Resistor to SGND sets average IVSYS from 125mA to 2A with ±2% accuracy; gain = 200µA/A. |
| FBVCAP (Pin 2) | End-of-charge voltage sense | Resistor divider sets final VCAP voltage (1.1V–5.5V); hysteresis prevents oscillation during termination. |
| VMID (Pin 21) | Active capacitor balancing output | Drives midpoint of series supercaps; suspends charging if VMID deviates >±125mV from VCAP/2 above 2.2V. |
| DIR (Pin 4) | Mode direction control | Logic-high (>1.095V) enables charging; logic-low (<1.045V) enables backup; hysteresis prevents chatter. |
| RUN (Pin 5) | Enable/shutdown control | ≥1.0V = active; ≤0.3V = shutdown; 6MΩ internal pull-down ensures safe default state. |
| SW1/SW2 (Pins 17–18 / 13–14) | Internal switch node connections | Connect to buck-boost inductor; require short, wide PCB traces to minimize ringing and EMI. |
| PGND (Pins 15,16,25) | Power ground return | Exposed pad must be soldered to PCB thermal plane; handles peak currents up to 4.5A DC. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic charge-to-backup switchover | Hardware-based transition within microseconds upon power failure-no µC intervention required for fail-safe hold-up. |
| Programmable ±2% charge current limit | Resistor-programmed IVSYS from 125mA to 2A-enables precise thermal and runtime budgeting in compact enclosures. |
| Integrated active capacitor balancing | VMID buffer delivers ±150mA balancing current-eliminates need for external balancer ICs in 2-cell supercap stacks. |
| 1.2MHz fixed-frequency PWM mode | Reduces output ripple and EMI vs. variable-frequency alternatives-critical for RF transceiver power integrity. |
| 40µA Burst Mode quiescent current | Extends supercap hold-up duration by >3× versus standard PWM-vital for long-duration brownout resilience. |
| Thermally enhanced QFN-24 package | θJC = 4.5°C/W enables 2A operation at TJ ≤ 150°C on 4-layer boards-supports industrial and automotive under-hood use. |
Applications
| Server Power Backup | RAID Controller Hold-Up |
|---|---|
Use Scenario: Maintains NVRAM and cache power during AC mains interruption in enterprise servers. IC Role / Device Role / Timing Role: Bidirectional buck-boost regulator providing regulated 3.3V backup from 5.5V supercap stack. Use Value: Enables ≥10ms clean shutdown or firmware save using only 10F supercap-reducing BOM count vs. discrete solutions. | Use Scenario: Sustains write-cache operation during unexpected power loss in enterprise RAID controllers. IC Role / Device Role / Timing Role: Charger/balancer for dual 2.7V/10F supercaps, delivering 2A backup into 3.3V load. Use Value: Active VMID balancing prevents overvoltage failure in stacked capacitors-extending field lifetime beyond 10 years. |
| RF Transceiver Backup | Industrial PLC Memory Retention |
Use Scenario: Powers LTE/5G baseband processor during brief grid dips in remote radio units. IC Role / Device Role / Timing Role: Low-noise 1.2MHz PWM-mode backup regulator supplying 1.8V/2A to SoC. Use Value: Fixed-frequency operation avoids spectral interference with adjacent RF bands-meeting EN 55022 Class B limits. | Use Scenario: Preserves SRAM and real-time clock during factory floor power glitches. IC Role / Device Role / Timing Role: Ultra-low-quiescent (40µA) charger maintaining 5.5V supercap for 72+ hours offline. Use Value: 1µA shutdown current minimizes self-discharge-ensuring memory retention across weekend outages. |
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 |
|---|---|---|---|
| LTC3110EUF#PBF | Same functionality but rated for –40°C to +125°C junction temperature; lower thermal derating margin. | Suitable for commercial/industrial ambient environments without extended high-temp exposure. | Select when operating junction temperature remains below 125°C-reduces cost without sacrificing performance. |
| MAX77820EWA+T | Single-direction buck-boost charger (VCAP→VSYS only); no backup mode or VMID balancing. | Limited to battery charging applications; cannot replace LTC3110HUF#PBF in true bidirectional backup systems. | Consider only for cost-sensitive charging-only designs where backup functionality is handled externally. |
Compared with LTC3110EUF#PBF, the LTC3110HUF#PBF provides guaranteed operation up to 150°C junction-critical for enclosed telecom gear-while MAX77820EWA+T lacks bidirectional capability and capacitor balancing, making it unsuitable as a functional replacement.
Availability
LTC3110HUF#PBF is available at Aetrix Electronics and suitable for server power backup, RAID controller hold-up, and RF transceiver backup requiring stable component supply with extended temperature support and traceable sourcing.
Supply support for LTC3110HUF#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 precision instrumentation, communications, and industrial markets.
The LTC3110 product line delivers highly integrated, thermally robust bidirectional power management ICs designed specifically for supercapacitor-based backup systems in mission-critical infrastructure equipment.
FAQ
What is the maximum junction temperature rating for the LTC3110HUF#PBF?
The LTC3110HUF#PBF is guaranteed to operate over a junction temperature range of –40°C to +150°C. This H-grade qualification distinguishes it from E- and I-grade variants and enables deployment in thermally demanding environments such as enclosed base stations or industrial control cabinets where ambient temperatures exceed 85°C.
How does the VMID pin function in the LTC3110HUF#PBF during supercapacitor charging?
The VMID pin on the LTC3110HUF#PBF serves as an active voltage balancing output that regulates the midpoint voltage of two series-connected supercapacitors to exactly half of VCAP. When VMID deviates beyond ±125mV from VCAP/2 (e.g., due to capacitor mismatch), the LTC3110HUF#PBF suspends charging until balance is restored-preventing overvoltage damage without external components.
Can the LTC3110HUF#PBF operate with a single 5.5V supercapacitor instead of a stacked configuration?
Yes, the LTC3110HUF#PBF fully supports single-capacitor configurations. In this case, the VMID pin must be bypassed with a 1nF capacitor to PGND per the datasheet. The device retains all core functions-including 0.1V–5.5V VCAP range, ±1% VSYS regulation, and 2A bidirectional current-making it ideal for space-constrained designs where stacking is impractical.
What is the purpose of the RSEN pin on the LTC3110HUF#PBF?
The RSEN pin on the LTC3110HUF#PBF provides access to the internal current-sense node between Switch D and the integrated sense resistor. It enables accurate measurement of charge or backup current using an external shunt or monitoring circuit. The pin is internally shorted to VSYS and must not carry more than 1.6A DC current to avoid exceeding absolute maximum ratings.
Does the LTC3110HUF#PBF support automatic mode transition without microcontroller intervention?
Yes, the LTC3110HUF#PBF supports fully autonomous charge-to-backup transition using its DIR pin hysteresis comparator. When system voltage (VSYS) drops below the undervoltage lockout threshold (1.55V–1.71V), the DIR comparator triggers immediate reversal of power flow-from charging to backup-within microseconds, ensuring uninterrupted operation without µC polling or firmware overhead.
LTC3110HUF#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-QFN (4x4)
LTC3110HUF#PBF FAQ
1.How can I place an order for LTC3110HUF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3110HUF#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 LTC3110HUF#PBF reliable?
The price and inventory of LTC3110HUF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3110HUF#PBF is usually 5 days.
3.What payment methods are accepted for LTC3110HUF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3110HUF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3110HUF#PBF?
LTC3110HUF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3110HUF#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 LTC3110HUF#PBF?
For technical support, including LTC3110HUF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3110HUF#PBF requirements.
6.How does Aetrix verify that LTC3110HUF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3110HUF#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 LTC3110HUF#PBF meets industry standards.
7.What is the process for return or replacement of LTC3110HUF#PBF?
All LTC3110HUF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3110HUF#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 LTC3110HUF#PBF part is unused and in its original packaging.
Return procedure for LTC3110HUF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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