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Analog Devices Inc. LTC3606BEDD#PBF
- Part No.:
- LTC3606BEDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3606BEDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:404
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Product details
Overview
LTC3606BEDD#PBF 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, supports 0.6V–5V output, delivers ±2% output voltage accuracy, and features 100% duty cycle dropout operation-ideal for USB-powered handheld devices and supercapacitor charging.
For engineers reviewing the LTC3606BEDD#PBF datasheet, LTC3606BEDD#PBF pinout, LTC3606BEDD#PBF application, or LTC3606BEDD#PBF equivalent, key selection considerations include its 475mA programmable input current limit (±5% accuracy), 2.25MHz fixed-frequency operation enabling compact 3mm × 3mm DFN designs, PGOOD monitoring, and thermal performance in –40°C to 85°C industrial environments.
Technical Context
The LTC3606BEDD#PBF employs a constant-frequency current-mode architecture with internal 2.25MHz oscillator and dual-MOSFET synchronous rectification (P-channel high-side, N-channel low-side). Its main control loop regulates peak inductor current via an error amplifier driving ITH, referenced to a precise 0.6V internal feedback voltage.
Input current limiting is implemented by sensing voltage drop across the integrated P-channel MOSFET's RDS(ON), generating a scaled current at the RLIM pin; when VRLIM reaches 1V, the on-time is reduced to maintain programmed average input current. Light-load operation transitions automatically to low-noise pulse-skipping mode without external intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - compatible with single-cell Li-ion and USB 2.0/3.0 bus power |
| Output Current | 800mA continuous - sufficient for RF transceivers, microcontrollers, and sensor subsystems |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-2.2μH inductors and <10mm² total solution size |
| Feedback Reference | 0.6V ±2% - sets output voltage via external resistor divider; supports down to 0.6V output |
| Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 500mA and USB 3.0 900mA source limits |
| Shutdown Current | ≤1μA - preserves battery life in always-on portable systems during deep sleep |
| Power Good Threshold | ±5% window around regulated VFB - provides clean enable signal for downstream logic sequencing |
Pinout & Package
Package: 8-Lead 3mm × 3mm plastic DFN with exposed pad (Pin 9), thermally enhanced for ≤40°C/W θJA. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Main power input | Accepts 2.5V–5.5V supply; requires local 10μF ceramic decoupling to GND |
| GND (Pins 1, 3, Exposed Pad 9) | Ground reference | All grounds tied together; exposed pad is mandatory thermal path and functional GND |
| SW (Pin 4) | Switch node | Connects to inductor; swings between VIN and GND; requires tight layout to minimize EMI |
| VFB (Pin 8) | Feedback input | Senses divided output voltage; regulated to 0.6V; sensitive to noise-route away from SW |
| PGOOD (Pin 6) | Open-drain status output | Pulled low when VFB deviates >±5%; requires external pull-up for logic-level signaling |
| RUN (Pin 7) | Enable control | High (>0.4V) enables regulation; low (<0.1V) forces shutdown with ≤1μA quiescent current |
| RLIM (Pin 2) | Input current limit programming | Resistor-to-GND sets average input current (e.g., 116kΩ = 475mA); capacitor adds filtering |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Average Input Current Limit | Set from 200mA to peak switch current (2.4A) using single resistor; ±5% accuracy over temperature |
| 100% Duty Cycle Low-Dropout Operation | Maintains regulation as VIN approaches VOUT; critical for battery end-of-life runtime extension |
| Internal Soft-Start | 950μs typical ramp time prevents inrush into large output capacitors; avoids input supply collapse |
| Pulse-Skipping at Light Loads | Reduces audible noise and RF emissions while sustaining >80% efficiency at 1mA load |
| Short-Circuit Protection | Forces extended low-side conduction to safely discharge inductor during output short; auto-recovery |
Applications
| USB Power Delivery Interface | Supercapacitor Charging Circuit |
|---|---|
Use Scenario: Regulating 5V USB input to 3.3V for embedded host controller while respecting 500mA source limit. IC Role / Device Role / Timing Role: Primary buck regulator with programmable input current limit enforcing USB 2.0 compliance. Use Value: Prevents host port overcurrent shutdown during peak 800mA load bursts while maintaining stable 3.3V rail. |
Use Scenario: Charging a 5.5V/1F supercapacitor from 5V USB supply with controlled inrush and voltage taper. IC Role / Device Role / Timing Role: Constant-current/constant-voltage charger using input current limit as CC mode and VFB feedback as CV mode. Use Value: Enables safe, efficient supercapacitor pre-charge without external sense resistors or op-amps. |
| GSM/GPRS Pulse Load Management | Portable Radio Transmitter Supply |
Use Scenario: Powering GSM module transmitting 2A pulses at 577μs duration every 4.7ms from limited 500mA USB source. IC Role / Device Role / Timing Role: High-peak-current buck with CLIM capacitor-tuned input current limit response timing. Use Value: Delivers required 2A burst while limiting average input to 475mA-prevents VIN droop beyond dropout threshold. |
Use Scenario: Supplying 3.4V/800mA to UHF transmitter PA stage in handheld radio with Li-ion battery input. IC Role / Device Role / Timing Role: Main system power converter with 100% duty cycle support for battery voltage sag during transmit. Use Value: Extends talk time by regulating down to 2.7V battery input without rail collapse or brownout reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 2.5V–5.5V input, 1.8V fixed output, 1.2A rating, 4MHz switching, no programmable input current limit | Lacks input current limiting; better suited for higher-current, non-USB-constrained loads | Select if higher output current and smaller inductor size are prioritized over USB compliance enforcement. |
| MAX20077ATC+T | 2.7V–5.5V input, adjustable 0.6V–5V output, 800mA, 2.1MHz, ±6% input current limit accuracy, no PGOOD | Lower input current limit accuracy; missing power-good indicator complicates system sequencing | Choose only if PGOOD is unnecessary and ±6% ILIM tolerance is acceptable for the target USB implementation. |
Compared with TPS6286418RTER and MAX20077ATC+T, the LTC3606BEDD#PBF uniquely combines ±5% accurate programmable input current limiting, PGOOD monitoring, and 100% duty cycle operation in a thermally optimized 3mm × 3mm DFN-making it the only option qualified for strict USB-powered, battery-endurance-critical designs requiring both peak load delivery and input compliance.
Availability
LTC3606BEDD#PBF is available at Aetrix Electronics and suitable for USB-powered handheld devices, supercapacitor energy storage systems, and GSM pulse-load transmitters requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LTC3606BEDD#PBF 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 legacy of high-performance power management ICs with rigorous automotive and industrial qualification.
The LTC3606B product line was designed specifically for space-constrained, input-current-limited applications such as USB peripherals and battery-powered RF systems-emphasizing precision current limiting, low-noise light-load operation, and robust thermal performance in miniature DFN packages.
FAQ
What is the maximum output current capability of the LTC3606BEDD#PBF?
The LTC3606BEDD#PBF delivers up to 800mA continuous output current under typical conditions (VIN ≥ 3.3V, TA = 25°C, proper thermal layout). Peak inductor current is internally limited to 2.4A, but sustained output is constrained by thermal dissipation in the 3mm × 3mm DFN package. Derating is required above 85°C ambient or with poor PCB copper area.
How do I configure the LTC3606BEDD#PBF for a 3.3V output?
To set 3.3V output on the LTC3606BEDD#PBF, use a resistor divider from VOUT to GND where R2 connects to VFB and R1 connects to GND. With VFB = 0.6V, select R2 = 499kΩ and R1 = 116kΩ (standard 1% values), yielding VOUT = 0.6V × (1 + 499k/116k) ≈ 3.3V. Keep total divider current near 10μA for optimal noise immunity and efficiency.
Does the LTC3606BEDD#PBF support true 100% duty cycle operation?
Yes, the LTC3606BEDD#PBF supports true 100% duty cycle operation: when VIN drops to within ~100mV of the regulated output voltage, the P-channel high-side switch remains continuously on, allowing VOUT ≈ VIN − IOUT × RDS(ON). This extends usable battery life in Li-ion systems down to 2.7V input while maintaining regulation.
What is the purpose of the CLIM capacitor on the RLIM pin of the LTC3606BEDD#PBF?
The CLIM capacitor on the RLIM pin of the LTC3606BEDD#PBF integrates the sensed input current signal to smooth transient spikes and set the response time of the average input current limit function. A 2200pF CLIM (with 116kΩ RLIM) yields ~92μs delay before limiting engages-critical for accommodating short RF transmit bursts without collapsing the input rail.
Is the exposed thermal pad (Pin 9) on the LTC3606BEDD#PBF electrically connected?
Yes, the exposed pad (Pin 9) on the LTC3606BEDD#PBF is electrically connected to GND and must be soldered to a PCB thermal pad tied to the system ground plane. This connection is mandatory for both thermal performance (θJA = 40°C/W) and electrical stability-floating or unconnected pads will cause overheating and potential device failure.
LTC3606BEDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- 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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3606BEDD#PBF FAQ
1.How can I place an order for LTC3606BEDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3606BEDD#PBF 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 LTC3606BEDD#PBF reliable?
The price and inventory of LTC3606BEDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3606BEDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3606BEDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3606BEDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3606BEDD#PBF?
LTC3606BEDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3606BEDD#PBF 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 LTC3606BEDD#PBF?
For technical support, including LTC3606BEDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3606BEDD#PBF requirements.
6.How does Aetrix verify that LTC3606BEDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3606BEDD#PBF 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 LTC3606BEDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3606BEDD#PBF?
All LTC3606BEDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3606BEDD#PBF, 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 LTC3606BEDD#PBF part is unused and in its original packaging.
Return procedure for LTC3606BEDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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