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Analog Devices Inc. LTC3620EDC#TRMPBF
- Part No.:
- LTC3620EDC#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3620EDC#TRMPBF.pdf
- Description:
- IC REG BUCK ADJ 15MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,449
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Product details
Overview
LTC3620EDC#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. It delivers up to 15mA output current with 95% peak efficiency, 18μA quiescent current, and a 0.6V feedback reference enabling 1.1V fixed or adjustable outputs. It is used in hearing aids and wireless headsets where minimal footprint and battery longevity are critical.
For engineers reviewing the LTC3620EDC#TRMPBF datasheet, LTC3620EDC#TRMPBF pinout, LTC3620EDC#TRMPBF application, or LTC3620EDC#TRMPBF equivalent, key selection factors include its 2.9V–5.5V input range, programmable 20kHz–300kHz frequency clamp via FMIN/MODE, low-battery detection (LOBATB), and 2mm × 2mm DFN-8 package with exposed thermal pad.
Technical Context
The LTC3620EDC#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 P-channel and N-channel MOSFETs (RDS(ON) = 2.0Ω / 1.0Ω @ 3.6V) eliminate external Schottky diodes and support synchronous rectification down to zero-load conditions.
It integrates a 0.6V precision reference, undervoltage lockout (UVLO at 2.8V), and open-drain LOBATB output triggered at VIN < 3.0V. The FMIN/MODE pin allows either internal 50kHz clamping or external clock synchronization (20–300kHz), enabling audio-noise mitigation in sensitive portable applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.9V to 5.5V - supports full discharge curve of single Li-Ion cell (2.9V cutoff avoids deep discharge damage). |
| Max Output Current | 15mA - sufficient for ultra-low-power analog signal chains and digital logic in hearing aids and wearables. |
| Quiescent Current | 18μA - enables >1-year battery life in button-cell-replacement applications with intermittent operation. |
| Feedback Reference | 0.6V - allows precise low-output regulation (e.g., 1.1V) using high-value resistive dividers to minimize standby current. |
| Switching Frequency Range | Variable, min-clamped from 40kHz (internal) to 300kHz (external) - suppresses audible noise while preserving light-load efficiency. |
| UVLO Threshold | 2.8V (typ) - prevents system brownout and protects battery from over-discharge below safe voltage. |
| LOBATB Threshold | 3.0V (typ), 100mV hysteresis - provides early warning of battery depletion before UVLO shutdown occurs. |
Pinout & Package
Package: 8-lead (2mm × 2mm) plastic DFN with exposed GND pad (Pin 9), requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects internal high-side and low-side MOSFETs to external inductor; high dv/dt node requiring short, low-inductance routing. |
| GND (Pin 2) | Signal ground | Reference for internal circuitry; must tie directly to local ground plane, separate from power return paths where possible. |
| FMIN/MODE (Pin 3) | Frequency clamp control | Accepts 0V (50kHz clamp), VIN (no clamp), or 20–300kHz external clock to set minimum switching frequency and avoid audio-band noise. |
| LOBATB (Pin 4) | Open-drain low-battery flag | Pulls low when VIN drops below 3.0V; requires external pull-up to system rail for host microcontroller monitoring. |
| NC (Pin 5) | No connect | Internally unconnected; must remain floating or grounded per layout guidelines-no external connection. |
| VFB (Pin 6) | Feedback input | Compares output voltage (via resistor divider) against 0.6V reference; connects directly to VOUT for LTC3620-1 variant. |
| RUN (Pin 7) | Enable input | Active-high enable: ≥0.8V enables regulator; ≤0.3V disables with <1μA shutdown current. |
| VIN (Pin 8) | Input supply | Primary power input (2.9–5.5V); requires local 1μF ceramic bypass capacitor placed adjacent to pin. |
| GND (Exposed Pad, Pin 9) | Thermal & power ground | Mandatory solder connection to PCB ground plane for thermal dissipation and low-impedance return path. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow quiescent current | 18μA typical - extends battery life in always-on sensor nodes without compromising startup time or regulation accuracy. |
| Synchronous MOSFET integration | Internal P/N-channel switches (2.0Ω/1.0Ω) - eliminates Schottky loss, improves light-load efficiency by >15% vs. asynchronous designs. |
| Programmable frequency clamp | 20–300kHz external clock input on FMIN/MODE - enables deterministic EMI control and eliminates sub-20kHz switching noise in audio-sensitive devices. |
| Low-battery detection with hysteresis | 3.0V threshold + 100mV hysteresis on LOBATB - prevents oscillation during battery sag and gives firmware reliable state transition timing. |
| Internal soft-start | Monotonic VOUT ramp with no external components - prevents inrush current and ensures clean power-up in multi-rail systems. |
Applications
| Hearing Aids | Wireless Headsets |
|---|---|
Use Scenario: Powering MEMS microphone bias, analog front-end amplifiers, and low-power DSP in miniaturized in-ear hearing aids. IC Role / Device Role / Timing Role: Primary 1.1V supply rail generator with ultra-low IQ and minimal ripple to preserve SNR in audio signal chain. Use Value: Enables >2-week continuous operation on size-10 hearing aid battery (160mAh) due to 18μA quiescent draw and 95% peak efficiency. |
Use Scenario: Providing stable 1.1V core voltage to Bluetooth LE SoC and codec during intermittent voice streaming. IC Role / Device Role / Timing Role: Synchronous buck regulator with programmable fMIN to avoid interference with 2.4GHz RF band and audio DAC clocks. Use Value: Reduces conducted EMI by shifting switching spectrum above 20kHz, eliminating audible coil whine during call mode. |
| Li-Ion Cell Applications | Button Cell Replacement |
Use Scenario: Regulating 3.6V nominal Li-Ion battery down to 1.1V for wearable health monitors with optical heart-rate sensors. IC Role / Device Role / Timing Role: High-efficiency step-down converter supporting full battery voltage range (4.2V → 2.9V) without dropout or reset. Use Value: Maintains >85% efficiency across entire discharge curve, maximizing usable capacity and runtime consistency. |
Use Scenario: Replacing CR2032 coin cells in compact IoT sensors (e.g., temperature loggers) using rechargeable Li-Ion pouch cells. IC Role / Device Role / Timing Role: Low-quiescent, shutdown-capable regulator enabling energy harvesting-compatible sleep modes (<1μA off-state). Use Value: Extends service interval from 6 months (CR2032) to 3+ years via rechargeable cell + 18μA active IQ and <1μA shutdown. |
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 |
|---|---|---|---|
| Texas Instruments TPS62740DRYR | 1.8V–5.5V input; 200mA max output; 360nA IQ in shutdown, 360nA in operational hibernate mode - significantly lower IQ but higher IQ (2.4μA) in active regulation vs. LTC3620EDC#TRMPBF's 18μA. | Targets longer shelf-life battery-powered IoT sensors; less suitable for audio-critical applications due to fixed 3MHz switching and no frequency clamp. | Select when multi-year shelf life and nanoamp hibernate dominate over audio noise and 15mA load requirements. |
| Analog Devices LTC3630EDC#TRMPBF | Same 2mm × 2mm DFN package; 100mA output; 25μA IQ; includes integrated 1.2MΩ/200kΩ feedback divider for 3.3V fixed output - higher current capability but higher quiescent draw and no LOBATB output. | Used in higher-current portable instrumentation; lacks low-battery flag and 0.6V reference flexibility for sub-1.2V outputs. | Select when >15mA load or fixed 3.3V output is required; not drop-in for 1.1V hearing aid rails or battery-monitoring use cases. |
Compared with TPS62740DRYR and LTC3630EDC#TRMPBF, the LTC3620EDC#TRMPBF uniquely balances ultralow 18μA operating IQ, programmable audio-noise-free frequency clamp, and dedicated LOBATB flag - making it the only option among the three qualified for Class I medical hearing aids requiring both battery telemetry and sub-20kHz silence.
Availability
LTC3620EDC#TRMPBF is available at Aetrix Electronics and suitable for hearing aids, wireless headsets, and Li-Ion-powered wearables requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LTC3620EDC#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC3620EDC#TRMPBF belongs to ADI's ultralow-power DC/DC converter product line, designed specifically for battery-constrained portable medical and audio devices demanding minimal IQ, small footprint, and intelligent battery interface features like LOBATB.
FAQ
What is the maximum output current supported by the LTC3620EDC#TRMPBF?
The LTC3620EDC#TRMPBF supports a maximum continuous output current of 15mA under typical conditions (VIN = 3.6V, VOUT = 1.1V, 22μH inductor). This limit arises from internal peak inductor current sensing at 35mA and duty-cycle constraints. Exceeding 15mA may cause regulation loss or thermal stress, especially at elevated ambient temperatures.
Does the LTC3620EDC#TRMPBF require external Schottky diodes?
No, the LTC3620EDC#TRMPBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs with RDS(ON) of 2.0Ω and 1.0Ω respectively, enabling full synchronous rectification and eliminating conduction losses associated with external diodes.
How is the output voltage set on the LTC3620EDC#TRMPBF?
The LTC3620EDC#TRMPBF uses a 0.6V internal feedback reference. For adjustable outputs, VFB is connected to a resistor divider between VOUT and GND: VOUT = 0.6V × (1 + R1/R2). For fixed 1.1V output, the LTC3620-1 variant is used - in which case VFB is connected directly to VOUT and no external resistors are needed.
What is the function of the FMIN/MODE pin on the LTC3620EDC#TRMPBF?
The FMIN/MODE pin on the LTC3620EDC#TRMPBF controls the minimum switching frequency: pulled low (0V) for internal 50kHz clamp, pulled high (VIN) to disable clamping, or driven with a 20–300kHz external clock to synchronize and fix the minimum frequency - all to suppress audible noise in sensitive audio applications.
Can the LTC3620EDC#TRMPBF operate with input voltages below 2.9V?
No, the LTC3620EDC#TRMPBF has a guaranteed operating input range of 2.9V to 5.5V. Below 2.9V, the device enters undervoltage lockout (UVLO) at 2.8V (typ), shutting down completely. Operation below 2.9V is not characterized and risks regulation failure or undefined behavior.
LTC3620EDC#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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.9V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- 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#TRMPBF FAQ
1.How can I place an order for LTC3620EDC#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3620EDC#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#TRMPBF reliable?
The price and inventory of LTC3620EDC#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#TRMPBF is usually 5 days.
3.What payment methods are accepted for LTC3620EDC#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3620EDC#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3620EDC#TRMPBF?
LTC3620EDC#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3620EDC#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#TRMPBF?
For technical support, including LTC3620EDC#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3620EDC#TRMPBF requirements.
6.How does Aetrix verify that LTC3620EDC#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LTC3620EDC#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#TRMPBF meets industry standards.
7.What is the process for return or replacement of LTC3620EDC#TRMPBF?
All LTC3620EDC#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3620EDC#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#TRMPBF part is unused and in its original packaging.
Return procedure for LTC3620EDC#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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