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Analog Devices Inc. LTC3606BIDD#TRPBF
- Part No.:
- LTC3606BIDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3606BIDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
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Product details
Overview
LTC3606BIDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic 800mA synchronous step-down DC/DC regulator with programmable average input current limit, constant-frequency current-mode control, and 2.25MHz switching. It operates from 2.5V to 5.5V input, delivers output voltages from 0.6V to 5V, and features 100% duty-cycle low-dropout operation for Li-ion and USB-powered systems.
For engineers reviewing the LTC3606BIDD#TRPBF datasheet, LTC3606BIDD#TRPBF pinout, LTC3606BIDD#TRPBF application, or LTC3606BIDD#TRPBF equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world design implications for high-peak-load, input-current-constrained power rails.
Technical Context
The LTC3606BIDD#TRPBF implements a constant-frequency (2.25MHz), current-mode buck architecture with internal P-channel and N-channel MOSFETs. Its main control loop regulates VFB to 0.6V via an error amplifier driving peak inductor current, while independent input current limiting uses on-resistance sensing of the P-FET to enforce programmable average input current (±5% accuracy) without collapsing VIN under transient load.
Light-load operation transitions automatically to low-noise pulse-skipping mode, preserving regulation while minimizing RF emissions and audio noise. Dropout behavior is enabled by 100% duty cycle capability, and short-circuit protection actively extends bottom-switch conduction to safely discharge inductors during fault conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and USB 2.0/3.0 bus power without external LDO pre-regulation. |
| Output Current | 800mA continuous - sufficient for powering core logic, RF transceivers, or sensor subsystems in portable devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 1.5–4.7μH surface-mount inductors and reduces output filter size. |
| Feedback Reference | 0.6V ±2% - allows precise low-voltage outputs (e.g., 1.2V, 1.8V, 3.3V) using standard resistor dividers. |
| Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 (500mA) or custom-defined input supply constraints. |
| Efficiency | Up to 96% - minimizes thermal rise in space-constrained DFN packages and extends battery runtime. |
| Shutdown Current | ≤1μA - preserves battery charge during system sleep modes without external disconnect circuitry. |
Pinout & Package
Package: 8-Lead 3mm × 3mm DFN with exposed thermal pad (Pin 9 = GND). Thermally enhanced layout requires soldering the exposed pad to PCB ground plane for θJA = 40°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Main power input | Accepts 2.5V–5.5V; must be decoupled with ≥10μF ceramic capacitor near pin. |
| GND (Pins 1, 3, Exposed Pad 9) | Power and signal reference | All grounds tied together; exposed pad mandatory for thermal performance and EMI reduction. |
| SW (Pin 4) | Switch node | Connects to inductor; swings between VIN and GND; requires tight layout to minimize ringing and EMI. |
| VFB (Pin 8) | Feedback input | Monitors output via resistive divider; regulated to 0.6V; sensitive to noise-route away from SW and inductor. |
| PGOOD (Pin 6) | Open-drain power-good flag | Pulls low when VFB deviates >±5% from 0.6V; used for sequencing or fault indication. |
| RUN (Pin 7) | Enable control | High (>0.4V) enables regulator; low (<0.1V) shuts down with ≤1μA quiescent current. |
| RLIM (Pin 2) | Input current limit programming | Resistor-to-GND sets average input current (e.g., 116kΩ = 475mA); optional CLIM capacitor filters transients. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Set via single external resistor (200–800mA range) with ±5% accuracy-enables USB-compliant power delivery without host negotiation. |
| Low-noise pulse-skipping at light loads | Maintains regulation down to ~100μA while suppressing audible noise and RF interference-ideal for always-on sensor nodes. |
| 100% duty-cycle dropout operation | Extends usable battery life by sustaining output as VIN drops to VOUT + IOUT×RDS(ON)-critical for deep-discharge Li-ion applications. |
| Internal soft-start (≈950μs) | Prevents inrush current into output capacitors; limits peak input current during startup-even with millifarad-level COUT. |
| Short-circuit protected | Forces extended bottom-FET conduction to safely dissipate stored inductor energy-prevents current runaway during output faults. |
Applications
| USB-Powered Portable Instruments | Supercapacitor Charging Circuits |
|---|---|
Use Scenario: Handheld multimeter powered directly from USB port with strict 500mA input limit. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3V to MCU and analog front-end while enforcing 475mA average input current. Use Value: Prevents USB host overcurrent shutdown during GSM pulse loads or display backlight activation while maintaining stable 3.3V rail. |
Use Scenario: Backup power system charging a 10F supercapacitor from 5V USB source before main system power-up. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger controller regulating input current to avoid violating USB spec during bulk charge phase. Use Value: Enables controlled 475mA charging current without external sense resistor or op-amp, reducing BOM count and board area. |
| GSM/GPRS Radio Transmitters | Industrial IoT Sensor Nodes |
Use Scenario: Cellular modem module requiring 3.4V @ 800mA peak during TX burst, supplied from 5V USB or Li-ion. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with fast transient response and input current limiting to prevent VIN droop during 2A pulse loads. Use Value: Sustains 3.4V output during 577μs GSM pulses using 2.2nF CLIM capacitor-delays current limiting just long enough to meet RF envelope requirements. |
Use Scenario: Battery-operated environmental sensor node with intermittent 100ms wake-up bursts drawing 600mA for radio transmission. IC Role / Device Role / Timing Role: Main system power supply enabling 100% duty-cycle operation down to 2.7V battery voltage while maintaining 1.8V digital rail. Use Value: Extends usable battery range by 12% compared to non-dropout regulators-delivers full output until cell voltage reaches 2.7V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62864DLCR | 2.5V–5.5V input, 1.2A output, 4MHz switching, fixed 1.8V output (non-adjustable) | Requires external resistor network for adjustable VOUT; lacks programmable input current limit | Choose for higher output current and smaller inductors where fixed 1.8V suffices and input current control is unnecessary. |
| MAX20077ATC+T | 2.7V–5.5V input, 800mA output, 2.2MHz, ±1.5% VFB accuracy, no input current limit | Higher VFB tolerance; no RLIM pin or average input current programming capability | Choose for automotive AEC-Q100 Grade-1 qualification and tighter thermal specs where USB input compliance is not required. |
Compared with LTC3606BIDD#TRPBF, TPS62864DLCR offers higher current and frequency but sacrifices input current limiting and output adjustability, while MAX20077ATC+T adds automotive qualification at the cost of missing the core input-current-control feature essential for USB and supercapacitor applications.
Availability
LTC3606BIDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered handheld devices, supercapacitor backup systems, and GSM transmitter power supplies requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LTC3606BIDD#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 power management portfolio with rigorous characterization and long-term product support.
The LTC3606BIDD#TRPBF belongs to Linear's monolithic buck regulator family designed specifically for high-efficiency, input-current-constrained point-of-load conversion in portable and battery-powered systems.
FAQ
What is the operating temperature range for the LTC3606BIDD#TRPBF?
The LTC3606BIDD#TRPBF is rated for operation from –40°C to +125°C junction temperature. This industrial-grade rating is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and is reflected in the "I" grade designation (LTC3606BDD) and order code suffix "#TRPBF". The device includes integrated overtemperature protection that activates above 125°C.
How is the input current limit programmed on the LTC3606BIDD#TRPBF?
The LTC3606BIDD#TRPBF uses an external resistor (RLIM) connected between Pin 2 (RLIM) and GND to set the average input current limit. The relationship is RLIM = 55kΩ / IDC, where IDC is the desired input current in amperes. For example, a 116kΩ resistor programs a 475mA limit. A capacitor (CLIM) in parallel with RLIM filters switching noise and adjusts response time-values from 100pF to 1μF are supported.
Does the LTC3606BIDD#TRPBF support adjustable output voltage?
Yes, the LTC3606BIDD#TRPBF supports fully adjustable output voltage from 0.6V to 5V using an external resistive divider connected to the VFB pin. The output is calculated as VOUT = 0.6V × (1 + R2/R1), where R1 connects from VOUT to VFB and R2 connects from VFB to GND. The 0.6V feedback reference has ±2% accuracy over temperature and line/load conditions.
What package type and thermal characteristics does the LTC3606BIDD#TRPBF have?
The LTC3606BIDD#TRPBF is housed in an 8-lead 3mm × 3mm plastic DFN package with an exposed thermal pad (Pin 9). The datasheet specifies θJA = 40°C/W when the exposed pad is properly soldered to a minimum 100mm² copper area on the PCB. This package enables high power density and efficient heat dissipation in compact portable designs.
Is the LTC3606BIDD#TRPBF pin-compatible with earlier LTC3606 variants?
No, the LTC3606BIDD#TRPBF is not pin-compatible with the original LTC3606. The LTC3606B introduces revised internal compensation and improved input current limit accuracy (±5% vs. ±10% in older versions), but retains identical pinout, package, and functional block diagram. Designers may drop-in replace LTC3606 with LTC3606B in existing layouts, though layout review for stability under new current-limit dynamics is recommended.
LTC3606BIDD#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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 800mA
- Frequency - Switching:
- 2.25MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3606BIDD#TRPBF FAQ
1.How can I place an order for LTC3606BIDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3606BIDD#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 LTC3606BIDD#TRPBF reliable?
The price and inventory of LTC3606BIDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3606BIDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3606BIDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3606BIDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3606BIDD#TRPBF?
LTC3606BIDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3606BIDD#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 LTC3606BIDD#TRPBF?
For technical support, including LTC3606BIDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3606BIDD#TRPBF requirements.
6.How does Aetrix verify that LTC3606BIDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3606BIDD#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 LTC3606BIDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3606BIDD#TRPBF?
All LTC3606BIDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3606BIDD#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 LTC3606BIDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3606BIDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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