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Analog Devices Inc. LTC3620EDC-1#TRMPBF
- Part No.:
- LTC3620EDC-1#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3620EDC-1#TRMPBF.pdf
- Description:
- IC REG BUCK 1.1V 15MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
LTC3620EDC-1#TRMPBF from Analog Devices (formerly Linear Technology) is an ultralow-power, synchronous step-down DC/DC converter optimized for single Li-Ion battery-powered systems requiring 1.1V output at up to 15mA. It integrates P-channel and N-channel MOSFETs, features a 0.6V internal reference, 18μA quiescent current, and operates from 2.9V to 5.5V input. Its primary role is efficient voltage regulation in space-constrained, battery-sensitive applications such as hearing aids and wireless headsets.
For engineers reviewing the LTC3620EDC-1#TRMPBF datasheet, LTC3620EDC-1#TRMPBF pinout, LTC3620EDC-1#TRMPBF application, or LTC3620EDC-1#TRMPBF equivalent, key selection criteria include its fixed 1.1V output, 50kHz internal frequency clamp, 2.8V UVLO threshold, low-battery detection via open-drain LOBATB, and compatibility with tiny 2mm × 2mm DFN layouts.
Technical Context
The LTC3620EDC-1#TRMPBF employs a variable-frequency, constant-on-time control architecture that dynamically scales switching frequency with load current-reducing switching losses at light loads while maintaining regulation. Its internal 50kHz minimum frequency clamp (activated by grounding FMIN/MODE) suppresses audio-band noise without external components.
It integrates synchronous power switches (RDS(ON) = 2.0Ω P-FET, 1.0Ω N-FET at 3.6V), eliminates external Schottky diodes, and uses internal soft-start and undervoltage lockout (UVLO at 2.8V) to protect both the IC and battery. The fixed 1.1V output is achieved via an internal resistive divider connected to VFB, requiring no external feedback resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.1V ±1.1% (guaranteed over –40°C to 85°C); enables direct connection of VFB to VOUT without external resistors. |
| Max Output Current | 15mA continuous; sufficient for ultra-low-power analog and mixed-signal circuits like codec biasing or sensor interfaces. |
| Input Voltage Range | 2.9V to 5.5V; supports full discharge curve of single Li-Ion cells (2.8V cutoff enforced by UVLO). |
| Quiescent Current | 18μA typical (no switching); ensures >1-year battery life in always-on wearable devices powered by 100mAh cells. |
| Shutdown Current | <1μA; allows deep sleep mode activation via RUN pin to minimize system standby loss. |
| UVLO Threshold | 2.8V (min); prevents battery over-discharge and maintains stable operation down to end-of-life cell voltage. |
| LOBATB Threshold | 3.0V (typical); open-drain alert signal triggers host MCU action before UVLO shutdown occurs. |
| Package | 8-lead 2mm × 2mm DFN with exposed thermal pad; requires PCB soldering for thermal integrity and EMI reduction. |
Pinout & Package
Package: 8-lead plastic DFN (2mm × 2mm), exposed pad (Pin 9) tied to GND. Requires soldering of exposed pad to PCB ground plane for thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high di/dt switching current; must be routed short and wide with ground plane underneath. |
| GND (Pin 2) | Signal and power ground | Primary ground return for internal circuitry; connects to local ground plane near SW and VIN paths. |
| FMIN/MODE (Pin 3) | Frequency clamp control | Pulled low for 50kHz internal minimum frequency; pulled high to disable clamp; accepts 20–300kHz external clock. |
| LOBATB (Pin 4) | Open-drain low-battery indicator | Pulls low when VIN drops below ~3.0V; requires external pull-up for MCU interrupt or status monitoring. |
| NC (Pin 5) | No connect | Not bonded internally; must remain unconnected and unrouted on PCB. |
| VFB (Pin 6) | Feedback input | Internally connected to 1.1V output divider; must be directly wired to VOUT for LTC3620EDC-1#TRMPBF operation. |
| RUN (Pin 7) | Enable control | Logic-high (>0.8V) enables regulator; logic-low (<0.3V) disables with <1μA supply current. |
| VIN (Pin 8) | Input supply | Accepts 2.9–5.5V; requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 18μA typical enables multi-year battery life in intermittent-use wearables without compromising regulation accuracy. |
| Synchronous MOSFET integration | Eliminates external Schottky diode and associated conduction loss, improving efficiency by ≥5% at 1–10mA loads. |
| Programmable minimum switching frequency | Internal 50kHz clamp (FMIN/MODE = 0V) avoids audible noise; external clocking (20–300kHz) allows EMI tailoring for sensitive RF sections. |
| Integrated low-battery detection | LOBATB output provides early warning at 3.0V, enabling graceful system shutdown before UVLO (2.8V) forces abrupt reset. |
| Fixed 1.1V output configuration | Removes need for external feedback resistors, reducing BOM count, board area, and resistor tolerance-induced output error. |
| Thermally enhanced DFN package | Exposed pad (Pin 9) soldered to PCB ground delivers θJA = 88.5°C/W, supporting reliable operation at 125°C junction temperature. |
Applications
| Hearing Aid Power Supply | Wireless Headset Codec Bias |
|---|---|
Use Scenario: Powers ultra-low-noise microphone preamplifiers and digital signal processors in in-the-ear (ITE) hearing aids using a single 3.7V Li-Ion cell. IC Role / Device Role / Timing Role: Primary voltage regulator delivering stable 1.1V to analog front-end and DSP core; operates in variable-frequency mode to minimize acoustic noise during quiet listening intervals. Use Value: 18μA IQ extends usable battery life beyond 14 days per charge; 50kHz frequency clamp prevents switching artifacts from entering audio band (<20kHz). |
Use Scenario: Supplies clean 1.1V bias to Bluetooth audio codec ICs in compact true-wireless stereo (TWS) earbuds with tight thermal constraints. IC Role / Device Role / Timing Role: Local point-of-load regulator replacing linear LDOs; synchronizes switching with baseband processor activity to reduce peak current demand. Use Value: Synchronous topology achieves 92% efficiency at 5mA load, reducing heat generation by 40% vs. comparable LDO solutions in sealed earbud enclosures. |
| Li-Ion Battery Monitoring Node | Medical Sensor Front-End |
Use Scenario: Powers microcontroller and fuel-gauge IC in portable medical monitors where battery voltage tracking must remain accurate down to 2.8V. IC Role / Device Role / Timing Role: Regulator with integrated LOBATB and UVLO functions; provides regulated 1.1V while feeding real-time VIN status to host MCU via open-drain alert. Use Value: Dual-threshold detection (3.0V LOBATB + 2.8V UVLO) enables two-stage battery management-warning then safe shutdown-without external comparators. |
Use Scenario: Supplies precision 1.1V reference and bias to low-power biosensor analog front-ends (e.g., ECG, pulse oximetry) in disposable patch monitors. IC Role / Device Role / Timing Role: Low-noise, low-drift power source for ADC reference and op-amp rails; internal 0.6V reference ensures <±0.5% output tolerance across temperature. Use Value: Fixed-output design eliminates resistor drift errors; 1.1V matches optimal ADC reference range for 12-bit medical-grade converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultralow-power synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62740DRYR | Fixed 1.8V output; 360nA IQ; 200mA max output; 2mm × 2mm DSBGA package | Higher output voltage and current; suited for MCU cores rather than analog bias rails | Select only if system requires >1.1V output and can accommodate higher IQ-driven runtime trade-offs. |
| MAX17222ETA+T | Adjustable 0.4–3.3V output; 600nA IQ; 100mA max; 2mm × 2mm TDFN package | Wider VOUT range but higher IQ; lacks integrated LOBATB and UVLO with hysteresis | Choose when programmable output and extreme ultra-low IQ outweigh need for battery-status signaling. |
Compared with TPS62740DRYR and MAX17222ETA+T, the LTC3620EDC-1#TRMPBF uniquely combines fixed 1.1V output, 18μA IQ, integrated LOBATB/UVLO, and 50kHz audio-noise suppression-making it optimal for analog-bias-critical, battery-aware medical and audio wearables where output voltage precision and early battery warning are non-negotiable.
Availability
LTC3620EDC-1#TRMPBF is available at Aetrix Electronics and suitable for hearing aid manufacturing, wireless headset design, and Li-Ion-powered medical sensor applications requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LTC3620EDC-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC3620 product line was designed specifically for ultralow-power, space-constrained battery-operated systems-emphasizing minimal quiescent current, integrated protection features, and robust operation across the full Li-Ion discharge curve.
FAQ
What is the output voltage of the LTC3620EDC-1#TRMPBF and how is it set?
The LTC3620EDC-1#TRMPBF provides a fixed 1.1V output, internally programmed via a precision resistive divider. Unlike the base LTC3620, it requires no external feedback resistors-VFB must be directly connected to VOUT. This eliminates resistor tolerance errors and reduces PCB footprint, making LTC3620EDC-1#TRMPBF ideal for high-volume, miniaturized designs where output accuracy and layout simplicity are critical.
Does the LTC3620EDC-1#TRMPBF include battery protection features?
Yes, the LTC3620EDC-1#TRMPBF integrates two battery protection functions: a low-battery alert (LOBATB) that pulls low when VIN drops below ~3.0V, and undervoltage lockout (UVLO) that disables the regulator when VIN falls below 2.8V. These features help prevent Li-Ion cell over-discharge and extend battery cycle life-both are active and fully specified across the –40°C to 85°C operating range of LTC3620EDC-1#TRMPBF.
How does the frequency control architecture of the LTC3620EDC-1#TRMPBF reduce audible noise?
The LTC3620EDC-1#TRMPBF uses a variable-frequency control scheme with an internal 50kHz minimum switching frequency clamp (enabled by grounding FMIN/MODE). This prevents the regulator from operating in the 20Hz–20kHz audio band at light loads-where human hearing is most sensitive-while maintaining high efficiency. The result is silent operation in hearing aids and headsets, a key advantage over fixed-frequency regulators that require external frequency dithering to achieve similar noise suppression in LTC3620EDC-1#TRMPBF applications.
What package type and thermal requirements apply to the LTC3620EDC-1#TRMPBF?
The LTC3620EDC-1#TRMPBF is housed in an 8-lead 2mm × 2mm plastic DFN package with an exposed thermal pad (Pin 9). That pad must be soldered to the PCB ground plane to ensure proper thermal dissipation (θJA = 88.5°C/W) and electrical stability. Failure to solder the exposed pad may cause thermal runaway or erratic regulation-this requirement is explicitly specified in the LTC3620EDC-1#TRMPBF datasheet and applies to all production builds.
Can the LTC3620EDC-1#TRMPBF operate from a partially discharged Li-Ion cell?
Yes, the LTC3620EDC-1#TRMPBF operates from 2.9V to 5.5V and remains functional down to 2.8V due to its UVLO threshold. This allows full utilization of a standard Li-Ion cell's discharge curve-from 4.2V fresh to ~2.8V end-of-life-without brownouts. Its 18μA quiescent current further maximizes usable energy extraction, enabling reliable operation in battery-powered devices throughout the entire cell voltage range supported by LTC3620EDC-1#TRMPBF.
LTC3620EDC-1#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.1V
- Voltage - Output (Max):
- -
- Current - Output:
- 15mA
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (2x2)
LTC3620EDC-1#TRMPBF FAQ
1.How can I place an order for LTC3620EDC-1#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3620EDC-1#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 LTC3620EDC-1#TRMPBF reliable?
The price and inventory of LTC3620EDC-1#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3620EDC-1#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3620EDC-1#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3620EDC-1#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3620EDC-1#TRMPBF?
LTC3620EDC-1#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3620EDC-1#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 LTC3620EDC-1#TRMPBF?
For technical support, including LTC3620EDC-1#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3620EDC-1#TRMPBF requirements.
6.How does Aetrix verify that LTC3620EDC-1#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3620EDC-1#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 LTC3620EDC-1#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3620EDC-1#TRMPBF?
All LTC3620EDC-1#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3620EDC-1#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 LTC3620EDC-1#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3620EDC-1#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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