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Analog Devices Inc. LTC3221EDC#TRPBF
- Part No.:
- LTC3221EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 6-WFDFN Exposed Pad
- Datasheet:
-
LTC3221EDC#TRPBF.pdf
- Description:
- IC REG CHARGE PUMP ADJ 60MA 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,862
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Product details
Overview
LTC3221EDC#TRPBF from Analog Devices (formerly Linear Technology) is a micropower regulated charge pump DC/DC converter delivering a fixed 3.3V ±4% output from 1.8V–4.4V input, supporting up to 60mA load current with 8µA typical no-load quiescent current and Burst Mode® operation. It operates as a voltage-doubling switched-capacitor regulator in battery-powered sensor and memory backup systems.
For engineers reviewing the LTC3221EDC#TRPBF datasheet, LTC3221EDC#TRPBF pinout, LTC3221EDC#TRPBF application, or LTC3221EDC#TRPBF equivalent, key selection criteria include ultralow quiescent current, short-circuit protection, shutdown disconnect functionality, and compatibility with ceramic flying/output capacitors in space-constrained 2mm × 2mm DFN layouts.
Technical Context
The LTC3221EDC#TRPBF implements a Burst Mode® controlled current-based voltage doubler architecture: regulation is achieved via comparator hysteresis monitoring VOUT against internal reference, triggering controlled-current ISW pulses to recharge the flying capacitor (CFLY) only when output drops below threshold. This enables 8µA no-load ICC while sustaining 60mA output.
It integrates active short-circuit protection (120–240mA ISC), shutdown disconnect (VOUT isolated from VIN), and thermal-safe operation with exposed-pad GND for θJA = 80°C/W. The device requires only one 1µF flying capacitor and two 2.2µF bypass capacitors - no inductors - enabling sub-1mm solution height.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT | Fixed 3.3V ±4% - maintains regulation across full 1.8V–4.4V input and 0–60mA load range. |
| VIN Range | 1.8V to 4.4V - supports single-cell Li-ion, NiMH, or dual-AA configurations without LDO pre-regulation. |
| IOUT Max | 60mA at VIN ≥ 2V - sufficient for low-power RF transmitters, glucose meter displays, or memory backup rails. |
| ICC (No Load) | 8µA typical - enables >1-year battery life in always-on tire pressure sensors or IoT endpoint nodes. |
| Shutdown Current | <1µA - ensures negligible drain during system sleep; SHDN pin disconnects VOUT from VIN. |
| Output Ripple | 35mVP-P at VIN=2V, IOUT=60mA, COUT=4.7µF - meets noise requirements for analog sensor front-ends. |
| Efficiency | 82% at VIN=2V, IOUT=60mA - exceeds linear regulators in same input-output delta, minimizing thermal rise. |
Pinout & Package
Package: 2mm × 2mm 6-pin DFN (0.75mm height) with exposed thermal pad (Pin 7, GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C+ (Pin 1) | Flying capacitor positive terminal | High dv/dt node; must be routed with minimal loop area to reduce EMI coupling into adjacent traces. |
| C– (Pin 2) | Flying capacitor negative terminal | Switched node referenced to GND during charge transfer; requires low-ESR ceramic capacitor (1µF). |
| SHDN (Pin 3) | Active-low shutdown control | CMOS input (VIH=1.3V, VIL=0.4V); must not float; pulls VOUT off VIN when asserted low. |
| GND (Pin 4) | Analog and power ground | Primary ground return; connects to exposed pad (Pin 7) - both must tie to solid ground plane. |
| VIN (Pin 5) | Input supply rail | Requires 2.2µF low-ESR ceramic bypass capacitor placed adjacent to pin to stabilize input during switching. |
| VOUT (Pin 6) | Regulated 3.3V output | Delivers up to 60mA; requires ≥2.2µF low-ESR ceramic capacitor close to pin to minimize ripple and transient droop. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 8µA typical no-load ICC enables multi-year operation on coin cells in maintenance-free sensors. |
| Burst Mode® regulation | Dynamically disables internal circuitry between output voltage dips, reducing average ICC at light loads without sacrificing transient response. |
| Short-circuit protected output | Internally limits ISC to 120–240mA indefinitely - eliminates need for external current-limiting components in fault-prone interfaces. |
| No-inductor design | Relies solely on ceramic flying and bypass capacitors - eliminates magnetic EMI, board area, and cost of inductors. |
| Shutdown disconnect | SHDN assertion isolates VOUT from VIN, preventing backfeed and enabling true zero-power system states. |
Applications
| Tire Pressure Monitoring System (TPMS) | Memory Backup Supply |
|---|---|
Use Scenario: Powering ultra-low-power pressure sensor IC and RF transmitter in wheel-mounted module. IC Role / Device Role / Timing Role: Provides stable 3.3V rail from aging 3V lithium primary cell; regulates despite voltage sag under RF burst load. Use Value: 8µA quiescent current extends battery life beyond 5 years; short-circuit tolerance prevents failure during antenna coupling events. |
Use Scenario: Maintaining SRAM or real-time clock (RTC) voltage during main power loss in industrial controllers. IC Role / Device Role / Timing Role: Acts as hold-up supply triggered by power-fail detection; delivers regulated 3.3V from supercapacitor or backup battery. Use Value: Shutdown disconnect prevents backup energy drain; 60mA capability supports larger SRAM arrays without external boost stages. |
| Glucose Meter Display Driver | Low-Power RF Transmitter Bias |
Use Scenario: Driving segmented LCD or OLED display in handheld medical device powered by AAA batteries. IC Role / Device Role / Timing Role: Generates clean 3.3V from 1.8–2.4V alkaline stack; supplies display bias and microcontroller I/O rail. Use Value: 35mVP-P ripple avoids visible display flicker; Burst Mode ensures consistent brightness across battery discharge curve. |
Use Scenario: Providing 3.3V bias to 2.4GHz BLE or sub-GHz transceiver IC in wireless sensor node. IC Role / Device Role / Timing Role: Supplies regulated VDD for RF PA and synthesizer; handles pulsed 40–50mA transmit current peaks. Use Value: 60mA peak output sustains RF bursts without brownout; no-inductor design avoids interference with sensitive RF front-end. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3204EDC-3.3#TRPBF | Higher output current (up to 50mA at 3.3V), but 15µA no-load ICC; uses constant-frequency control instead of Burst Mode. | Less suitable for multi-year battery life; better for applications requiring predictable switching frequency (e.g., EMI-sensitive medical devices). | Select LTC3221EDC#TRPBF when ultralow ICC dominates; choose LTC3204EDC-3.3#TRPBF when deterministic frequency and higher sustained current are required. |
| LTC1751EDC-3.3#TRPBF | Same 3.3V output, but 20µA ICC and SOT-23-5 package; lacks shutdown disconnect and short-circuit protection. | Not viable for safety-critical or fault-tolerant designs; limited to low-risk, low-current (<25mA) applications. | LTC3221EDC#TRPBF is preferred where robustness, efficiency, and long service life are mandatory; LTC1751EDC-3.3#TRPBF suits cost-sensitive, non-critical replacements. |
Compared with LTC3204EDC-3.3#TRPBF and LTC1751EDC-3.3#TRPBF, the LTC3221EDC#TRPBF delivers superior energy efficiency at light loads, integrated fault protection, and smaller footprint - making it optimal for space- and battery-constrained edge sensors and wearables.
Availability
LTC3221EDC#TRPBF is available at Aetrix Electronics and suitable for tire pressure sensors, memory backup supplies, glucose meters, low-power RF transmitters, and portable medical devices requiring stable component supply and long-term lifecycle support.
Supply support for LTC3221EDC#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 continues its legacy of high-performance analog, power management, and signal conditioning ICs for precision and energy-efficient systems.
The LTC3221EDC#TRPBF belongs to Linear's micropower charge pump family, designed specifically for ultra-low-power, inductorless DC/DC conversion in battery-operated medical, automotive, and industrial sensing applications.
FAQ
What is the input voltage range supported by the LTC3221EDC#TRPBF?
The LTC3221EDC#TRPBF supports an input voltage range of 1.8V to 4.4V. Operation below 1.8V is not guaranteed, and exceeding 4.4V may damage the device. Within this range, it delivers a regulated 3.3V ±4% output, with full 60mA capability enabled only above 2V input.
Does the LTC3221EDC#TRPBF require external inductors?
No, the LTC3221EDC#TRPBF is a switched-capacitor charge pump and requires no inductors. It uses only three external ceramic capacitors: one 1µF flying capacitor (CFLY) between C+ and C– pins, and two 2.2µF bypass capacitors at VIN and VOUT. This eliminates magnetic EMI and reduces solution size.
How does the LTC3221EDC#TRPBF behave during output short-circuit conditions?
The LTC3221EDC#TRPBF limits output short-circuit current to 120–240mA indefinitely and remains functional after fault removal. Its controlled-current ISW architecture prevents thermal runaway, eliminating the need for external current-limiting components or foldback protection circuits.
What is the purpose of the exposed pad on the LTC3221EDC#TRPBF DFN package?
The exposed pad (Pin 7) on the LTC3221EDC#TRPBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to achieve θJA = 80°C/W and ensure safe thermal dissipation under 60mA load. Omitting this connection risks junction temperature exceedance and premature failure.
Can the LTC3221EDC#TRPBF be used with a 1.5V input source?
No - the LTC3221EDC#TRPBF has a minimum specified input voltage of 1.8V. At 1.5V, the device will not start up or regulate; UVLO (1V threshold) may prevent operation entirely. For 1.5V sources, consider the LTC3203 series or other dedicated low-VIN charge pumps.
LTC3221EDC#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC3221EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3221EDC#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#TRPBF reliable?
The price and inventory of LTC3221EDC#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#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3221EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3221EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3221EDC#TRPBF?
LTC3221EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3221EDC#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#TRPBF?
For technical support, including LTC3221EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3221EDC#TRPBF requirements.
6.How does Aetrix verify that LTC3221EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3221EDC#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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3221EDC#TRPBF?
All LTC3221EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3221EDC#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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3221EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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