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Analog Devices Inc. LTC3221EDC-5#TRPBF
- Part No.:
- LTC3221EDC-5#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3221EDC-5#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP 5V 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LTC3221EDC-5#TRPBF from Analog Devices (formerly Linear Technology) is a micropower regulated charge pump DC/DC converter delivering a fixed 5V ±4% output from 2.7V–5.5V input, supporting up to 60mA load current with 8µA no-load quiescent current and Burst Mode® operation. It serves as a compact, inductorless voltage booster for low-power battery-powered systems such as tire pressure sensors and RF transmitters.
For engineers reviewing the LTC3221EDC-5#TRPBF datasheet, LTC3221EDC-5#TRPBF pinout, LTC3221EDC-5#TRPBF application, or LTC3221EDC-5#TRPBF equivalent, key selection criteria include its 2mm × 2mm 6-pin DFN package, shutdown disconnect functionality, short-circuit protection, regulated 5V output tolerance, and compatibility with ceramic flying/output capacitors (1µF/2.2µF minimum).
Technical Context
The LTC3221EDC-5#TRPBF implements a Burst Mode® switched-capacitor voltage doubler architecture using a controlled current source (ISW) and comparator-based hysteresis regulation. It operates at a fixed 600kHz switching frequency and achieves ultralow quiescent current by disabling internal circuitry except the comparator when VOUT remains above threshold.
Its regulation mechanism relies on monitoring VOUT via internal feedback (no external FB pin), with output strength governed by effective open-loop resistance (ROL ≈ 10–20Ω), directly impacted by flying capacitor value (1µF typical), oscillator frequency, and switch resistance. Short-circuit survival is ensured by ISW current limiting to 120–240mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | 5V ±4% - tightly regulated output enabling stable 5V rail for logic or analog circuitry without LDO post-regulation. |
| VIN Range | 2.7V to 5.5V - supports single Li-ion (3.0–4.2V), two alkaline (2.7–3.2V), or USB 5V input with headroom margin. |
| IOUT Max | 60mA - sufficient for low-power microcontrollers, sensors, or RF ICs; sustained under full VIN range with defined derating. |
| ICC (No Load) | 8µA typical - enables multi-year battery life in always-on sensor nodes (e.g., TPMS) with minimal standby drain. |
| Shutdown Current | <1µA - ensures near-zero power loss during system sleep; SHDN pin disconnects VOUT from VIN. |
| Efficiency | 82% at VIN=3V, IOUT=60mA - high conversion efficiency despite charge-pump topology, reducing thermal stress and extending battery runtime. |
| Output Ripple | 45mVP-P max (VIN=3V, IOUT=60mA, COUT=4.7µF) - low enough for noise-sensitive analog/RF stages when proper ceramic caps are used. |
Pinout & Package
Package: 2mm × 2mm 6-pin DFN (0.75mm height), exposed pad (Pin 7) soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive terminal | Connects to + side of 1µF ceramic flying capacitor; carries high dv/dt switching current - requires short, low-inductance trace. |
| C– (Pin 2) | Flying capacitor negative terminal | Connects to – side of flying capacitor; referenced to GND during charge phase - must be routed adjacent to C+ with minimal loop area. |
| SHDN (Pin 3) | Active-low shutdown control | CMOS input (VIH=1.3V, VIL=0.4V); pulls VOUT off VIN when low; must not float - tie to GND or MCU GPIO. |
| GND (Pin 4) | Power and signal ground | Main return path; connects to exposed pad (Pin 7) - requires solid ground plane connection for thermal dissipation and noise immunity. |
| VIN (Pin 5) | Input supply voltage | Accepts 2.7–5.5V; bypassed with ≥2.2µF low-ESR ceramic cap placed adjacent to pin to suppress input ripple and transient currents. |
| VOUT (Pin 6) | Regulated 5V output | Delivers 5V ±4% up to 60mA; bypassed with ≥2.2µF (preferably 4.7µF) low-ESR ceramic cap close to pin to minimize output ripple and load transient response. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor design | Eliminates magnetic components, EMI concerns, and board space - ideal for ultra-thin wearables and compact IoT modules. |
| Burst Mode® control | Maintains 8µA quiescent current at light loads while enabling 82% efficiency at full 60mA - optimizes battery life across dynamic usage profiles. |
| Short-circuit protection | Internally limits output current to 120–240mA indefinitely - prevents thermal runaway and enables robust operation in fault-prone environments. |
| Shutdown disconnect | Physically isolates VOUT from VIN during SHDN assertion - avoids backfeed and preserves battery charge in deep-sleep modes. |
| Solution profile <1mm | 0.75mm package height + low-profile capacitors enable integration into space-constrained applications like medical patches or smart tags. |
Applications
| Tire Pressure Monitoring System (TPMS) | Low-Power RF Transmitter |
|---|---|
Use Scenario: Battery-powered sensor node mounted inside vehicle tire, transmitting pressure/temperature data every 1–5 minutes. IC Role / Device Role / Timing Role: Voltage booster generating stable 5V rail from 3V coin cell or Li-SOCl₂ battery to power pressure sensor and sub-GHz RF IC. Use Value: 8µA quiescent current extends 10-year battery life; short-circuit tolerance prevents failure during antenna impedance mismatch events. | Use Scenario: Wireless sensor node transmitting telemetry over 868/915MHz ISM band using low-duty-cycle burst transmission. IC Role / Device Role / Timing Role: Supplies regulated 5V to RF power amplifier and crystal oscillator during active transmit bursts. Use Value: Burst Mode® ensures minimal idle current between transmissions; 60mA output supports peak PA current without brownout. |
| Glucose Meter Electronics | Memory Backup Supply |
Use Scenario: Portable handheld medical device performing electrochemical glucose strip analysis with LCD display and BLE interface. IC Role / Device Role / Timing Role: Generates 5V rail from single 3.7V Li-ion cell to power ADC reference, op-amps, and display driver. Use Value: Tight 5V ±4% regulation ensures accurate analog measurement; 2mm × 2mm DFN fits tight PCB real estate constraints. | Use Scenario: Industrial controller maintaining SRAM or RTC state during main power interruption using supercapacitor or backup battery. IC Role / Device Role / Timing Role: Provides clean, regulated 5V from 3.3V system rail or backup source to preserve volatile memory contents. Use Value: Shutdown disconnect prevents backup energy leakage; low ripple (<45mVP-P) avoids memory corruption during retention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3204-5 | Higher output current (150mA), larger 3mm × 3mm DFN-10 package, constant-frequency operation (no Burst Mode), higher IQ (25µA). | Suitable for higher-power RF or display backlighting where continuous regulation and higher current are required. | Select LTC3204-5 only if >60mA load or lower output ripple at high frequency is mandatory; avoid if board space or ultra-low IQ are critical. |
| LTC1751-5 | Same 5V fixed output, SOT-23-5 package, 100mA capability, 20µA IQ, no shutdown disconnect function. | Preferred for cost-sensitive, medium-current applications where board area is less constrained than height and shutdown isolation is unnecessary. | Choose LTC1751-5 when footprint flexibility allows SOT-23 and shutdown disconnect is not required; not suitable for battery-backed memory retention. |
Compared with LTC3221EDC-5#TRPBF, LTC3204-5 trades ultra-low IQ and minimal footprint for higher current and lower ripple, while LTC1751-5 offers higher current in a different package but lacks critical shutdown isolation - making LTC3221EDC-5#TRPBF optimal for space- and battery-life-constrained sensor nodes requiring fail-safe power gating.
Availability
LTC3221EDC-5#TRPBF is available at Aetrix Electronics and suitable for tire pressure monitoring systems, glucose meters, RF transmitter modules, and memory backup supplies requiring stable component supply, long-lifecycle support, and consistent parametric performance.
Supply support for LTC3221EDC-5#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 acquired Linear Technology in 2017 and maintains its precision analog and power management portfolio with rigorous quality and longevity standards.
The LTC3221 family was designed specifically for ultra-low-power, space-constrained battery-operated applications demanding regulated voltage boosting without inductors - targeting medical sensors, automotive TPMS, and portable instrumentation.
FAQ
What is the input voltage range supported by the LTC3221EDC-5#TRPBF?
The LTC3221EDC-5#TRPBF supports an input voltage range of 2.7V to 5.5V. This range accommodates common sources such as two AA/AAA cells (2.7–3.2V), single Li-ion batteries (3.0–4.2V), and USB 5V rails. Operation below 2.7V is not guaranteed, and exceeding 5.5V violates absolute maximum ratings and may damage the device.
Does the LTC3221EDC-5#TRPBF require an external feedback resistor network?
No, the LTC3221EDC-5#TRPBF does not require an external feedback network. It is a fixed-output variant with internal resistive division set for 5V ±4%. Unlike the adjustable LTC3221 (which uses the FB pin), the LTC3221EDC-5#TRPBF replaces Pin 3 with SHDN and has no FB functionality - simplifying design and reducing BOM count.
How does the LTC3221EDC-5#TRPBF behave during output short-circuit conditions?
The LTC3221EDC-5#TRPBF delivers a controlled short-circuit current of 120–240mA and survives indefinite short-circuit events without damage. Its internal current source (ISW) limits output current, preventing thermal runaway. During short-circuit, VOUT collapses to near 0V, and the device continues operating in Burst Mode®, drawing only leakage current once discharged.
What capacitor values are recommended for the LTC3221EDC-5#TRPBF?
For the LTC3221EDC-5#TRPBF, use a 1µF X5R/X7R ceramic flying capacitor (CFLY) between C+ and C–, a ≥2.2µF low-ESR ceramic input capacitor (CIN) at VIN, and a ≥2.2µF (preferably 4.7µF) low-ESR ceramic output capacitor (COUT) at VOUT. All capacitors must be non-polarized ceramics - tantalum or aluminum electrolytics are prohibited for CFLY due to polarity reversal risk.
Is the exposed thermal pad on the LTC3221EDC-5#TRPBF required to be soldered?
Yes, the exposed pad (Pin 7) on the LTC3221EDC-5#TRPBF must be soldered to a PCB ground plane. It serves as both the primary thermal path (θJA = 80°C/W with proper layout) and an extension of the GND net. Omitting this connection degrades thermal performance, risks junction temperature exceedance (>125°C), and compromises electrical stability - especially under sustained 60mA loads.
LTC3221EDC-5#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 60mA
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
LTC3221EDC-5#TRPBF FAQ
1.How can I place an order for LTC3221EDC-5#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3221EDC-5#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 LTC3221EDC-5#TRPBF reliable?
The price and inventory of LTC3221EDC-5#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3221EDC-5#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3221EDC-5#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3221EDC-5#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3221EDC-5#TRPBF?
LTC3221EDC-5#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3221EDC-5#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 LTC3221EDC-5#TRPBF?
For technical support, including LTC3221EDC-5#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3221EDC-5#TRPBF requirements.
6.How does Aetrix verify that LTC3221EDC-5#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3221EDC-5#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 LTC3221EDC-5#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3221EDC-5#TRPBF?
All LTC3221EDC-5#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3221EDC-5#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 LTC3221EDC-5#TRPBF part is unused and in its original packaging.
Return procedure for LTC3221EDC-5#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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