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Analog Devices Inc. LTC3620EDC#TRPBF
- Part No.:
- LTC3620EDC#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3620EDC#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 15MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,018
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Product details
Overview
LTC3620EDC#TRPBF 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 precise low-voltage regulation down to 1.1V in hearing aids and wireless headsets.
For engineers reviewing the LTC3620EDC#TRPBF datasheet, LTC3620EDC#TRPBF pinout, LTC3620EDC#TRPBF application, or LTC3620EDC#TRPBF equivalent, key selection criteria include its variable-frequency architecture with programmable 20–300kHz minimum switching clamp, integrated P/N-channel MOSFETs, undervoltage lockout at 2.8V, and low-battery detection via open-drain LOBATB output.
Technical Context
The LTC3620EDC#TRPBF employs a unique variable-frequency control scheme where switching frequency scales with load current, reducing switching losses at light loads while maintaining regulation. Its internal phase-frequency detector (PFD) dynamically adjusts peak inductor current to sustain a user-programmable minimum frequency when clamped.
It integrates synchronous power MOSFETs (RDS(ON) = 2.0Ω P-FET / 1.0Ω N-FET at 3.6V), eliminates external Schottky diodes, and features internal soft-start, shutdown mode (<1μA IQSD), and a dedicated FMIN/MODE pin supporting both internal 50kHz default and external clock synchronization.
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 sensor biasing in wearable audio devices. |
| Quiescent Current | 18μA - enables >1-year battery life in button-cell-replacement applications with intermittent wake-up cycles. |
| Feedback Reference | 0.6V - allows direct 1.1V output using LTC3620-1 variant or resistor-divider programming for other voltages. |
| Min Switching Frequency | Programmable 20–300kHz - suppresses audible noise by avoiding 20Hz–20kHz range; default 50kHz when FMIN/MODE = 0V. |
| UVLO Threshold | 2.8V (typ) - prevents battery over-discharge and system instability during brownout conditions. |
| LOBATB Threshold | 3.0V (typ) - provides early warning of battery depletion before UVLO triggers, enabling graceful shutdown. |
Pinout & Package
Package: 2mm × 2mm, 8-lead plastic DFN with exposed GND pad (Pin 9), rated for –40°C to +85°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (Pin 1) | Switch node | Connects to inductor; carries high dI/dt switching current-requires short, wide trace and ground plane beneath. |
| GND (Pin 2) | Signal and power ground | Primary return path for internal circuitry; must tie directly to local ground plane. |
| FMIN/MODE (Pin 3) | Frequency clamp control | Pull low for 50kHz internal clamp; apply 20–300kHz external clock for precise noise management. |
| LOBATB (Pin 4) | Open-drain low-battery flag | Asserts low when VIN drops below ~3.0V-enables host MCU to initiate power-save routines. |
| NC (Pin 5) | No connect | Unbonded die pad-must remain unconnected and unrouted on PCB. |
| VFB (Pin 6) | Feedback input | Compares output voltage against 0.6V reference; connects to resistor divider (or VOUT for LTC3620-1). |
| RUN (Pin 7) | Enable input | High (>0.8V) enables regulator; low (<0.3V) forces shutdown 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 |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode and associated conduction loss-critical for >90% efficiency at sub-1mA loads. |
| Variable-frequency architecture | Reduces switching loss at light loads while maintaining regulation; avoids fixed-frequency EMI peaks. |
| Programmable audio-noise suppression | External FMIN/MODE clocking enables deterministic spectral placement-essential for hearing aid RF coexistence. |
| Integrated low-battery monitoring | LOBATB output provides system-level battery health awareness without external comparators or resistors. |
| Thermally enhanced DFN package | Exposed GND pad (Pin 9) soldered to PCB delivers θJA = 88.5°C/W-enables reliable operation in sealed wearables. |
Applications
| Hearing Aids | Wireless Headsets |
|---|---|
Use Scenario: Powering ultra-low-noise microphone preamps and digital signal processors in miniaturized in-ear devices. IC Role / Device Role / Timing Role: Primary 1.1V supply rail generator with <1μA quiescent draw during standby and minimal output ripple during audio playback. Use Value: Extends battery life beyond 10 days per charge while suppressing switching artifacts that could modulate audio signals. |
Use Scenario: Providing regulated 1.8V bias to Bluetooth LE radio ICs and touch-sensing controllers in compact earbuds. IC Role / Device Role / Timing Role: Low-noise, low-quiescent buck converter synchronized to avoid interference with 2.4GHz ISM band operation. Use Value: Enables use of smaller batteries by minimizing no-load power loss and eliminating need for discrete LDO post-regulation. |
| Li-Ion Cell Applications | Button Cell Replacement |
Use Scenario: Directly regulating output from 3.0–4.2V Li-Ion cells to stable 1.1V/1.8V rails in medical sensors and IoT edge nodes. IC Role / Device Role / Timing Role: Single-chip solution replacing linear regulators-maintains regulation across full battery discharge with UVLO protection. Use Value: Delivers 2× longer runtime vs. LDOs and eliminates thermal derating concerns in confined enclosures. |
Use Scenario: Replacing CR2032 coin cells in smart tags and asset trackers requiring 1.1V logic supply. IC Role / Device Role / Timing Role: Efficient step-down converter enabling use of higher-capacity Li-Ion pouch cells in same footprint. Use Value: Supports >5-year shelf life with <1μA shutdown current and eliminates voltage droop during pulse transmissions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62740DRYR | Lower IQ (360nA), fixed 1.8V output, no FMIN/MODE pin, 10mA max output | Better for always-on sensor nodes; lacks programmable noise control and LOBATB flag | Choose when ultra-low shutdown current dominates over flexibility and battery monitoring. |
| MAX17222ELT+T | Higher IQ (800nA), 1.2V fixed output, no LOBATB, 100mA max output | Supports higher current but lacks low-battery alert and fine-grained frequency control | Prefer when scaling to multi-sensor modules needing >15mA, accepting trade-off in battery-awareness. |
Compared with TPS62740DRYR and MAX17222ELT+T, the LTC3620EDC#TRPBF uniquely combines programmable audio-noise suppression, integrated low-battery detection, and 15mA capability in a 2mm × 2mm DFN-making it optimal for space-constrained, battery-health-aware audio and wearable designs.
Availability
LTC3620EDC#TRPBF is available at Aetrix Electronics and suitable for hearing aids, wireless headsets, and Li-Ion-powered medical sensors requiring stable component supply with long-term lifecycle assurance.
Supply support for LTC3620EDC#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 automotive-grade qualification and long-term product support.
The LTC3620EDC#TRPBF belongs to Linear's ultralow-power DC/DC converter family, designed specifically for energy-constrained portable electronics where battery life, size, and electromagnetic compatibility are critical.
FAQ
What is the maximum output current supported by the LTC3620EDC#TRPBF?
The LTC3620EDC#TRPBF delivers up to 15mA of continuous output current under typical conditions (VIN = 3.6V, VOUT = 1.1V, 22μH inductor). This limit arises from its 35mA peak inductor current capability and internal MOSFET RDS(ON) characteristics. Exceeding this current causes foldback or dropout depending on input voltage and thermal conditions. The LTC3620EDC#TRPBF datasheet specifies this as the absolute maximum sustained load.
Does the LTC3620EDC#TRPBF require external Schottky diodes?
No, the LTC3620EDC#TRPBF does not require external Schottky diodes. It integrates synchronous P-channel and N-channel MOSFETs to replace the traditional diode in the buck topology, improving efficiency-especially at light loads-and eliminating reverse recovery losses. This is explicitly confirmed in the "Features" section of the LTC3620EDC#TRPBF datasheet and block diagram.
How does the FMIN/MODE pin affect switching behavior in the LTC3620EDC#TRPBF?
The FMIN/MODE pin on the LTC3620EDC#TRPBF sets the minimum switching frequency: pulling it low enables the internal 50kHz clamp; applying a 20–300kHz external clock synchronizes the minimum frequency to that value; pulling it high disables clamping entirely. This directly controls audible noise generation and EMI profile-critical for hearing aids. The LTC3620EDC#TRPBF's variable-frequency architecture remains active above this clamp.
What is the function of the LOBATB pin on the LTC3620EDC#TRPBF?
The LOBATB pin on the LTC3620EDC#TRPBF is an open-drain output that pulls low when the input voltage falls below approximately 3.0V (typ), providing early warning of battery depletion before undervoltage lockout (UVLO) at 2.8V triggers shutdown. This allows host microcontrollers to save state or reduce activity. The LTC3620EDC#TRPBF datasheet specifies LOBATB hysteresis as 100mV and pull-down resistance as 15Ω.
Can the LTC3620EDC#TRPBF be used with a fixed 1.1V output without external resistors?
Yes-but only with the LTC3620-1 variant (e.g., LTC3620EDC-1#TRPBF), which has an internal resistor divider programmed for 1.1V. The standard LTC3620EDC#TRPBF requires external R1/R2 feedback resistors to set VOUT using VOUT = 0.6V × (R1 + R2)/R2. Using the LTC3620EDC#TRPBF with VFB tied directly to VOUT will result in incorrect regulation; the LTC3620EDC#TRPBF must be configured per its datasheet's feedback network guidelines.
LTC3620EDC#TRPBF 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#TRPBF FAQ
1.How can I place an order for LTC3620EDC#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3620EDC#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 LTC3620EDC#TRPBF reliable?
The price and inventory of LTC3620EDC#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3620EDC#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3620EDC#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3620EDC#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3620EDC#TRPBF?
LTC3620EDC#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3620EDC#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 LTC3620EDC#TRPBF?
For technical support, including LTC3620EDC#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3620EDC#TRPBF requirements.
6.How does Aetrix verify that LTC3620EDC#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3620EDC#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 LTC3620EDC#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3620EDC#TRPBF?
All LTC3620EDC#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3620EDC#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 LTC3620EDC#TRPBF part is unused and in its original packaging.
Return procedure for LTC3620EDC#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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