My Inquiry
My Account
Analog Devices Inc. LTC3226EUD#TRPBF
- Part No.:
- LTC3226EUD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Power Management - Specialized
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
LTC3226EUD#TRPBF.pdf
- Description:
- IC 2CELL SUPERCAP CHARGE 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,580
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3226EUD#TRPBF from Analog Devices (formerly Linear Technology) is a 2-cell series supercapacitor charger with integrated backup PowerPath™ controller and 2A peak LDO. It delivers programmable 2.5V–5.3V supercapacitor stack voltage, 315mA max input current limit, and automatic switchover between VIN-powered normal mode and CPO-powered backup mode - enabling reliable hold-up power for industrial data loggers and solid-state drives.
For engineers reviewing the LTC3226EUD#TRPBF datasheet, LTC3226EUD#TRPBF pinout, LTC3226EUD#TRPBF application, or LTC3226EUD#TRPBF equivalent, key selection criteria include its dual-mode (1x/2x) charge pump architecture, internal cell-balancing amplifier, VMID midpoint regulation, 0.8V LDO feedback reference, and 16-lead 3mm × 3mm QFN package with exposed thermal pad.
Technical Context
The LTC3226EUD#TRPBF integrates four core functional blocks: a 0.9MHz regulated charge pump with automatic 1x-to-2x mode transition at 200mV VIN–CPO differential; an internal leakage balancer that actively regulates VMID to exactly half of CPO voltage (±4.5mA source / ±5.5mA sink); a 2A peak LDO with 200mΩ RDS(ON) and 0.8V servo reference; and a fast power-fail comparator with 1.2V threshold and 20mV hysteresis driving PFO and mode control.
Its PowerPath™ architecture uses an external P-channel MOSFET controlled by the GATE pin to maintain 15mV forward drop in normal mode and reverse-blocking within 45mV of VIN–VOUT collapse. The device enters backup mode only when VIN falls below the resistor-programmed PFI threshold and CPO exceeds VIN by ≥100mV - ensuring stable LDO enablement without cross-conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single Li-ion, USB, or 3.3V/5V system rails without level-shifting. |
| CPO Output Voltage Range | 2.5V to 5.3V - resistor-programmable via CPO_FB pin with 1.2V internal reference. |
| Max Input Current Limit | 315mA - set by external PROG resistor; short-circuit limited to 600mA if PROG grounded. |
| LDO Output Current | Up to 2A peak - delivered from supercapacitors during backup; internally current-limited to 4A. |
| Quiescent Current (Normal) | 55μA typical - measured at VOUT with VPFI > 1.2V and VCPO_FB > 1.2V. |
| VMID Regulation Accuracy | ±2.5% over temperature - maintains exact ½ CPO voltage for balanced 2-cell supercapacitor stacks. |
| Package | 16-lead 3mm × 3mm QFN with exposed thermal pad - requires soldered GND pad for θJA = 58.7°C/W. |
Pinout & Package
Package: 16-lead (3mm × 3mm) plastic QFN with exposed thermal pad (Pin 17 = GND). Requires PCB thermal vias under exposed pad for thermal compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT (Pin 1) | Main output rail | Delivers power to load from VIN (via external PFET) or CPO (via LDO); bypass with ≥47μF ceramic capacitor. |
| PFO (Pin 2) | Open-drain power-fail status | Pulled low when PFI < 1.2V; signals backup mode initiation with sub-μs latency. |
| PFI (Pin 3) | Power-fail comparator input | High-impedance 1.2V threshold input; sets VIN switchover point via external resistor divider. |
| LDO_FB (Pin 4) | LDO feedback node | 0.8V servo reference; connects to resistor divider between VOUT and GND to program LDO output. |
| GATE (Pin 5) | External PFET gate driver | Controls ideal diode conduction; maintains 15mV VIN–VOUT drop in normal mode. |
| RST_FB (Pin 6) | Reset comparator input | 0.74V falling threshold; shares resistor divider with LDO_FB to monitor VOUT regulation. |
| RST (Pin 7) | Open-drain reset output | Pulled low when VOUT drops >7.5%; 290ms delay on rising edge ensures stable post-startup reset release. |
| EN_CHG (Pin 8) | Charge pump enable | Active-low; internal pull-up keeps charger enabled unless driven <0.4V. |
| PROG (Pin 9) | Charger current limit programming | Resistor to GND sets input current limit (e.g., 33.2kΩ = 315mA); short-circuit protected. |
| CPO_FB (Pin 10) | Charge pump feedback | 1.2V reference input; programs CPO termination voltage via resistor divider from CPO to GND. |
| CAPGOOD (Pin 11) | Supercapacitor ready indicator | Open-drain output pulled low until CPO reaches ±7.5% of target; confirms stack readiness. |
| C– (Pin 12) | Flying capacitor negative terminal | Connects to negative side of 1–10μF X5R/X7R flying capacitor (C+ to C–). |
| VIN (Pin 13) | Main input supply | Primary power source (2.5–5.5V); powers VOUT path and charge pump; bypass with ≥2.2μF ceramic. |
| VMID (Pin 14) | Supercapacitor stack midpoint | Internally regulated to ½ CPO voltage; enables automatic cell balancing without external resistors. |
| C+ (Pin 15) | Flying capacitor positive terminal | Connects to positive side of flying capacitor; forms charge transfer path for 1x/2x pump. |
| CPO (Pin 16) | Backup supply input | Connects to top plate of upper supercapacitor; powers LDO during backup mode. |
| GND (Pin 17) | Ground reference & thermal pad | Exposed pad must be soldered to PCB ground plane with multiple thermal vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic 1x/2x charge pump mode switching | Transitions at 200mV VIN–CPO differential to maximize charging efficiency across full voltage range. |
| Integrated leakage balancer | Servos VMID to exactly ½ CPO voltage with ±5mA capability - eliminates need for passive balancing resistors. |
| Voltage clamp per supercapacitor | Hard-clamps individual cell voltage to ≤2.65V - prevents overvoltage damage during unbalanced charging. |
| Low-noise 0.9MHz charge pump | Minimizes EMI in noise-sensitive applications; effective open-loop output resistance ≈6Ω at 1MHz/1μF. |
| Fast ideal diode control | Turns off external PFET within 45mV of VIN–VOUT reversal - prevents reverse current and protects primary supply. |
| Programmable power-fail hysteresis | External diode-resistor network increases PFI hysteresis beyond internal 20mV - avoids oscillation near threshold. |
Applications
| Smart Power Meter Hold-Up | Industrial SSD Backup Supply |
|---|---|
Use Scenario: Maintains real-time clock and nonvolatile memory during AC mains interruption in utility meters. IC Role / Device Role / Timing Role: LTC3226EUD#TRPBF acts as autonomous backup power manager - charging supercapacitors from 3.3V rail and delivering regulated 3.3V to RTC/NVRAM during outage. Use Value: Enables >10-second hold-up time with 1.2F stack; eliminates battery replacement and supports wide temperature operation (–40°C to 125°C). |
Use Scenario: Preserves write cache integrity in 3.3V solid-state drives during sudden power loss. IC Role / Device Role / Timing Role: LTC3226EUD#TRPBF serves as fail-safe power path controller - detecting VIN collapse and instantly enabling LDO from charged supercapacitors. Use Value: Guarantees clean shutdown and metadata preservation with <500μs switchover; supports JEDEC-compliant power-loss protection. |
| Battery-Powered Medical Data Logger | Industrial Alarm System Backup |
Use Scenario: Provides uninterrupted power to microcontroller and sensor interface during Li-ion battery swap or deep discharge. IC Role / Device Role / Timing Role: LTC3226EUD#TRPBF functions as seamless power arbitrator - maintaining VOUT from VIN or CPO without brownout or reset. Use Value: Delivers 2A peak current for burst transmission; ultra-low 55μA quiescent current extends primary battery life. |
Use Scenario: Powers critical alarm circuitry and communication module during extended AC failure in factory safety systems. IC Role / Device Role / Timing Role: LTC3226EUD#TRPBF operates as self-contained backup supervisor - monitoring VIN, regulating CPO, and asserting PFO/RST for system-level fault reporting. Use Value: Ensures continuous operation for >30 seconds using compact 1.2F supercapacitor; meets IEC 61000-4-28 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supercapacitor backup power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17112ETL+ | Single-cell supercapacitor charger; no VMID balancer; 1.2A LDO; 3mm × 3mm TDFN package. | Limited to 1-cell stacks; lacks automatic cell balancing and 2A backup capability. | Select for cost-sensitive, lower-current 1-cell designs where VMID regulation is unnecessary. |
| BQ33100RGER | Standalone supercapacitor manager IC; no integrated LDO; requires external regulator; 20-pin VQFN. | Requires external 2A LDO and discrete ideal diode; higher BOM count and layout complexity. | Select when system already includes high-efficiency buck-boost regulator and design flexibility justifies added components. |
Compared with MAX17112ETL+ and BQ33100RGER, the LTC3226EUD#TRPBF uniquely integrates 2-cell balancing, 2A LDO, and PowerPath™ arbitration in one 16-pin QFN - reducing solution size by >40% and eliminating external balancing resistors and discrete regulators required by alternatives.
Availability
LTC3226EUD#TRPBF is available at Aetrix Electronics and suitable for smart power meter hold-up, industrial SSD backup supplies, and battery-powered medical data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3226EUD#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, Inc. (including legacy Linear Technology products) is a global leader in high-performance analog, mixed-signal, and power management semiconductors for precision instrumentation, industrial automation, and mission-critical systems.
The LTC3226EUD#TRPBF belongs to Analog Devices' PowerPath™ family of intelligent power management ICs, designed specifically for seamless main-to-backup power switchover in energy-harvesting, battery-backed, and supercapacitor-holdup applications.
FAQ
What is the maximum supercapacitor stack voltage supported by the LTC3226EUD#TRPBF?
The LTC3226EUD#TRPBF supports a maximum supercapacitor stack voltage of 5.3V, as specified in the absolute maximum ratings and electrical characteristics tables. This corresponds to two 2.65V-rated supercapacitors in series, with internal clamping circuitry ensuring neither cell exceeds 2.65V during charging - a critical safeguard against overvoltage degradation.
How does the LTC3226EUD#TRPBF achieve automatic cell balancing without external resistors?
The LTC3226EUD#TRPBF achieves automatic cell balancing via an internal leakage balancer amplifier that actively regulates the VMID pin to exactly half the CPO voltage. With ±4.5mA sourcing and ±5.5mA sinking capability, it corrects minor imbalances caused by capacitor leakage mismatch - eliminating the need for power-wasting external balancing resistors while maintaining strict 2.5% VMID accuracy.
Can the LTC3226EUD#TRPBF operate with a single supercapacitor instead of two in series?
No - the LTC3226EUD#TRPBF is specifically architected for 2-cell series supercapacitor stacks. Its VMID pin, internal voltage clamp (2.65V per cell), and balancer amplifier all assume a midpoint reference between two capacitors. Using a single capacitor disables VMID functionality, invalidates the clamp protection, and prevents proper CAPGOOD assertion, making it unsuitable for single-cell configurations.
What is the purpose of the RST_FB pin and how is it related to the LDO_FB pin?
The RST_FB pin provides a dedicated input to the reset comparator, monitoring VOUT regulation with a 0.74V falling threshold. It can share the same resistor divider used for LDO_FB (which references 0.8V), allowing both LDO output voltage and reset threshold to track proportionally - ensuring RST asserts when VOUT drops >7.5% below its programmed value, regardless of the selected output voltage.
Does the LTC3226EUD#TRPBF require external MOSFETs for power-path control?
Yes - the LTC3226EUD#TRPBF requires an external P-channel MOSFET connected between VIN and VOUT, driven by the GATE pin. The IC provides ideal diode control logic but does not integrate the power switch. This architecture allows designers to select MOSFETs optimized for specific RDS(ON), voltage rating, and thermal performance - unlike fully integrated solutions with fixed FET characteristics.
LTC3226EUD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PowerPath™
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Supercapacitor Charger
- Current - Supply:
- 10µA
- Voltage - Supply:
- 2.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
LTC3226EUD#TRPBF FAQ
1.How can I place an order for LTC3226EUD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3226EUD#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 LTC3226EUD#TRPBF reliable?
The price and inventory of LTC3226EUD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3226EUD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3226EUD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3226EUD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3226EUD#TRPBF?
LTC3226EUD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3226EUD#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 LTC3226EUD#TRPBF?
For technical support, including LTC3226EUD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3226EUD#TRPBF requirements.
6.How does Aetrix verify that LTC3226EUD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3226EUD#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 LTC3226EUD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3226EUD#TRPBF?
All LTC3226EUD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3226EUD#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 LTC3226EUD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3226EUD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3226EUD#TRPBF Tags
-
TPS2511DGNR
Texas Instruments
-
UTC2000/MG
Microchip Technology
-
TUSB320HAIRWBR
Texas Instruments
-
TPS61252DSGR
Texas Instruments
-
PI5USB30216CXUAEX
Diodes Incorporated
-
SN6501DBVR
Texas Instruments
-
CYPD3177-24LQXQT
Infineon Technologies
-
SN6501QDBVRQ1
Texas Instruments
-
STUSB1600AQTR
STMicroelectronics
-
SN6505BDBVR
Texas Instruments
-
SN6501DBVT
Texas Instruments
-
TPS65150PWPR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
