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Analog Devices Inc. LTC3221EDC#TRMPBF
- Part No.:
- LTC3221EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3221EDC#TRMPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
LTC3221EDC#TRMPBF from Analog Devices (formerly Linear Technology) is a micropower regulated charge pump DC/DC converter in a 2mm × 2mm 6-pin DFN package, delivering a fixed 3.3V ±4% output from 1.8V–4.4V input, supporting up to 60mA load, with 8µA no-load quiescent current and Burst Mode® operation for ultra-low power consumption - ideal for battery-powered tire pressure sensors and memory backup supplies.
For engineers reviewing the LTC3221EDC#TRMPBF datasheet, LTC3221EDC#TRMPBF pinout, LTC3221EDC#TRMPBF application, or LTC3221EDC#TRMPBF equivalent, key selection criteria include input voltage range compatibility (1.8V–4.4V), regulated 3.3V output tolerance (±4%), short-circuit survivability, shutdown current (<1µA), and solution height <1mm for space-constrained portable designs.
Technical Context
The LTC3221EDC#TRMPBF implements a Burst Mode® controlled switched-capacitor voltage doubler architecture with internal hysteresis regulation, using a controlled current source (ISW) to charge the flying capacitor and maintain VOUT within ±4% without inductors. It operates across –40°C to 85°C and features built-in short-circuit protection with indefinite survival at VOUT-to-GND fault.
Its shutdown function disconnects VOUT from VIN when SHDN is pulled low (VIH = 1.3V, VIL = 0.4V), reducing supply current to <1µA; the exposed thermal pad (Pin 7) must be soldered to PCB ground for thermal and electrical integrity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | 3.3V ±4% - maintains stable rail for low-power microcontrollers and sensors under varying load and input conditions |
| VIN Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, or dual-AA battery inputs without brownout risk |
| IOUT Max | 60mA at VIN ≥ 2V - sufficient for RF transmitters, glucose meter analog front-ends, or EEPROM backup circuits |
| ICC (No Load) | 8µA typical - enables multi-year battery life in always-on IoT endpoints |
| Shutdown Current | <1µA - ensures negligible drain during system sleep modes |
| Switching Freq | 600kHz - enables use of small 1µF ceramic flying capacitor and minimizes EMI filtering burden |
| Output Ripple | 35mVP-P at VIN=2V, IOUT=60mA, COUT=4.7µF - compatible with noise-sensitive analog signal chains |
Pinout & Package
Package: 2mm × 2mm, 0.75mm height, 6-pin plastic DFN with exposed thermal pad (Pin 7 = GND). Requires soldering of exposed pad to PCB ground plane for thermal performance and electrical reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive terminal | Connects to high-side plate of 1µF non-polarized ceramic flying capacitor; handles high dv/dt switching edges |
| C– (Pin 2) | Flying capacitor negative terminal | Connects to low-side plate; polarity reversal during operation prohibits polarized capacitors |
| SHDN (Pin 3) | Active-low shutdown control | CMOS input with 0.4V/1.3V thresholds; must not float; disconnects VOUT from VIN in shutdown |
| GND (Pin 4) | Analog and power ground | Primary ground reference; ties to PCB ground plane; shares thermal pad connection |
| VIN (Pin 5) | Input supply voltage | Accepts 1.8V–4.4V; requires 2.2µF low-ESR bypass capacitor placed adjacent to pin |
| VOUT (Pin 6) | Regulated 3.3V output | Delivers up to 60mA; requires ≥2.2µF low-ESR output capacitor; sensitive to layout parasitics |
| Exposed Pad (Pin 7) | Thermal and electrical ground | Must be soldered to solid PCB ground plane; reduces θJA to 80°C/W and improves ripple rejection |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8µA typical no-load operating current enables >10-year battery life in 20µA average-load applications |
| Burst Mode® regulation | Dynamically disables internal circuitry between charge pulses, maintaining efficiency >82% from 1mA to 60mA load |
| Short-circuit protected | Survives indefinite VOUT-to-GND fault with 120–240mA limited output current, preventing thermal runaway |
| No-inductor design | Relies solely on 1µF flying + 2×2.2µF bypass capacitors - eliminates magnetic EMI, size, and cost of inductors |
| Solution profile <1mm | 0.75mm package height + low-profile capacitors fits within tight mechanical envelopes (e.g., wearable sensors) |
Applications
| Tire Pressure Monitoring System (TPMS) | Memory Backup Supply |
|---|---|
Use Scenario: Powering ultra-low-power pressure sensor ICs and RF transmitters inside rotating wheel assemblies with coin-cell or thin-film batteries. IC Role / Device Role / Timing Role: Provides regulated 3.3V rail from 2.0–3.6V battery input; enables periodic wake-up, measurement, and 433MHz transmission bursts. Use Value: 8µA quiescent current extends 2032 coin-cell life beyond 5 years; 60mA peak delivery supports RF PA drive without voltage sag. | Use Scenario: Maintaining SRAM or real-time clock (RTC) voltage during main system power loss in industrial controllers or medical devices. IC Role / Device Role / Timing Role: Acts as hold-up supply, sourcing 1–5mA continuously from backup supercapacitor or lithium coin cell. Use Value: <1µA shutdown current prevents backup energy depletion; ±4% regulation preserves data integrity across temperature and aging. |
| Glucose Meter Front-End | Low-Power RF Transmitter |
Use Scenario: Powering electrochemical sensor bias circuitry and ADC reference in handheld diabetic test strips. IC Role / Device Role / Timing Role: Supplies clean 3.3V to precision op-amps and 16-bit SAR ADC; activated only during 10-second measurement cycle. Use Value: 35mVP-P ripple at full load avoids ADC quantization error; Burst Mode eliminates switching noise during critical sampling windows. | Use Scenario: Driving sub-GHz ISM band transceivers (e.g., TI CC1101) in wireless sensor nodes powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Generates stable 3.3V from decaying 2.4–3.2V battery stack; handles 50mA TX current pulses with minimal droop. Use Value: Effective open-loop resistance <15Ω ensures <50mV load transient deviation; 600kHz switching allows compact 0603 capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3204EDD-3.3#TRMPBF | Higher output current (150mA), constant-frequency operation (1MHz), larger 3mm × 3mm DFN-10 package | Supports higher-power RF modules or multi-rail systems requiring tighter ripple control and faster transient response | Select when >60mA load or lower ripple (<15mVP-P) is required; avoid if board area or quiescent current (<8µA) are critical |
| LTC1754EDD-3.3#TRMPBF | Lower IQ (13µA), SOT-23-6 package, 50mA max output, same 3.3V fixed output and 1.8V–5.5V input range | Preferred for cost-sensitive, low-density layouts where DFN assembly is unavailable or thermal pad routing is impractical | Choose for legacy SMT lines or space-constrained but thermally tolerant designs; trade-off is reduced current capability and higher thermal resistance |
Compared with LTC3221EDC#TRMPBF, LTC3204EDD-3.3#TRMPBF delivers 2.5× more current in a larger footprint and higher IQ, while LTC1754EDD-3.3#TRMPBF offers SOT-23 compatibility at 17% higher quiescent current and 17% lower output current - making LTC3221EDC#TRMPBF optimal for ultra-small, ultra-low-power 3.3V point-of-load conversion.
Availability
LTC3221EDC#TRMPBF is available at Aetrix Electronics and suitable for tire pressure monitoring systems, memory backup supplies, glucose meters, and low-power RF transmitters requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC3221EDC#TRMPBF 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 product lines with full datasheet, simulation model, and application support.
The LTC3221 family was designed specifically for micropower, inductorless DC/DC conversion in space- and energy-constrained battery-operated systems - emphasizing ultralow IQ, robust short-circuit behavior, and minimal external component count.
FAQ
What is the input voltage range supported by the LTC3221EDC#TRMPBF?
The LTC3221EDC#TRMPBF supports an input voltage range of 1.8V to 4.4V. Operation below 1.8V will cause undervoltage lockout (UVLO) activation at ~1V threshold, while exceeding 4.4V risks violating absolute maximum ratings. This range enables direct use with single-cell Li-ion (2.7–4.2V), NiMH (1.0–1.4V/cell), or dual-AA alkaline (2.4–3.2V) sources - all verified per LTC3221-3.3 datasheet specifications.
Does the LTC3221EDC#TRMPBF require an inductor in its application circuit?
No, the LTC3221EDC#TRMPBF does not require an inductor. It uses a switched-capacitor charge pump topology with one flying capacitor (1µF ceramic) and two bypass capacitors (2.2µF each at VIN and VOUT). This inductorless design eliminates magnetic EMI, reduces board area, and lowers BOM cost - a core architectural feature confirmed in the LTC3221 family datasheet Block Diagram and Applications section.
What is the maximum continuous output current of the LTC3221EDC#TRMPBF?
The LTC3221EDC#TRMPBF delivers up to 60mA continuously when VIN ≥ 2V. At VIN < 2V (but ≥1.8V), maximum output current is limited to 25mA to maintain regulation within ±4%. These values are specified in the Electrical Characteristics table for LTC3221-3.3 and validated across temperature in Figure G07 (Load Regulation) and G08 (Output Load Capability).
How does the LTC3221EDC#TRMPBF behave during a VOUT-to-GND short circuit?
The LTC3221EDC#TRMPBF survives indefinite VOUT-to-GND short circuits by limiting output current to 120–240mA via its controlled current source (ISW), as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. Unlike linear regulators, it does not overheat - junction temperature remains within safe limits due to low duty-cycle Burst Mode operation and thermal pad dissipation, per Figure F05 (Power Dissipation vs Ambient Temperature).
Can the LTC3221EDC#TRMPBF be used with a 1.5V input source?
No, the LTC3221EDC#TRMPBF cannot operate reliably from a 1.5V input. Its minimum specified input voltage is 1.8V, and UVLO activates below ~1.0V. Attempting 1.5V operation results in unstable regulation, excessive ripple, or complete failure to start - confirmed by the VIN specification row (1.8V–4.4V) and Figure G01 (Oscillator Frequency vs Supply Voltage), which shows functional operation only above 1.8V.
LTC3221EDC#TRMPBF 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.23V
- Voltage - Output (Max):
- 11V
- 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#TRMPBF FAQ
1.How can I place an order for LTC3221EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3221EDC#TRMPBF 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#TRMPBF reliable?
The price and inventory of LTC3221EDC#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3221EDC#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3221EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3221EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3221EDC#TRMPBF?
LTC3221EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3221EDC#TRMPBF 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#TRMPBF?
For technical support, including LTC3221EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3221EDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3221EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3221EDC#TRMPBF 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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3221EDC#TRMPBF?
All LTC3221EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3221EDC#TRMPBF, 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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3221EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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