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Analog Devices Inc. LTC3606BIDD#PBF
- Part No.:
- LTC3606BIDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3606BIDD#PBF.pdf
- Description:
- IC REG BUCK ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LTC3606BIDD#PBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with programmable average input current limiting, designed for USB-powered and battery-operated systems. It operates from 2.5V to 5.5V input, delivers up to 800mA output at 0.6V–5V adjustable VOUT, features 2.25MHz constant-frequency current-mode control, 100% duty cycle low-dropout operation, and ±2% output voltage accuracy.
For engineers reviewing the LTC3606BIDD#PBF datasheet, LTC3606BIDD#PBF pinout, LTC3606BIDD#PBF application, or LTC3606BIDD#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed input current limit programming behavior, real-world transient response characteristics, and cross-referenced alternatives for USB power delivery, supercapacitor charging, and GSM pulse-load systems.
Technical Context
The LTC3606BIDD#PBF implements 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 average input current limit is set via external resistor RLIM (e.g., 116kΩ yields 475mA), with sensing derived from RDS(ON) of the integrated PFET and trimmed 1/55,000 current scaling.
During light loads, it transitions to low-noise pulse-skipping mode; under overload or short-circuit, it reduces switching frequency and limits peak inductor current. The 0.6V feedback reference enables precise output regulation, while internal soft-start (≈950μs) controls inrush current, and PGOOD monitors VFB within ±5% to ±11% window with 90μs blanking.
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 RF transceivers, microcontrollers, and sensor subsystems in handheld devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of compact 1.5–4.7μH surface-mount inductors and minimizes EMI filtering footprint. |
| Feedback Reference | 0.6V ±2% - allows stable 1.2V, 1.8V, 3.3V, or 5V outputs with standard resistor dividers; low drift over –40°C to 125°C. |
| Input Current Limit Accuracy | ±5% - ensures reliable compliance with USB 2.0 500mA and USB 3.0 900mA source limits without derating. |
| Shutdown Current | ≤1μA - preserves battery life in always-on monitoring or wake-on-event applications. |
| Thermal Performance | θJA = 40°C/W - requires exposed pad soldered to PCB ground plane for full 125°C junction operation. |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN with exposed thermal pad (Pin 9), rated for –40°C to 125°C operating junction temperature. Exposed pad must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 5) | Main power supply input | Accepts 2.5V–5.5V; requires local 10μF ceramic decoupling to GND; supplies both control circuitry and power switches. |
| GND (Pins 1, 3, 9) | Ground reference and thermal path | Pins 1 & 3 are signal GND; Pin 9 is exposed pad - all must connect to low-impedance PCB ground plane for stability and thermal dissipation. |
| SW (Pin 4) | Switch node | Connects to inductor; swings between VIN and GND; high di/dt node requiring tight layout and minimal trace length. |
| VFB (Pin 8) | Feedback input | Monitors resistive divider output; regulated to 0.6V; sensitive to noise - route away from SW and inductor. |
| PGOOD (Pin 6) | Open-drain power-good indicator | Pulls low when VFB is outside ±5% to ±11% window; used for system sequencing and fault detection. |
| RUN (Pin 7) | Enable control | High >1.2V enables regulator; low <0.4V disables with ≤1μA shutdown current; compatible with logic-level GPIO. |
| RLIM (Pin 2) | Average input current limit programming | Connect resistor-to-GND to set IDC (e.g., 116kΩ = 475mA); optional CLIM capacitor filters transient current sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable average input current limit | Set from 200mA to 2.4A via single RLIM resistor; maintains input supply stability during high peak load pulses (e.g., GSM transmit bursts). |
| 100% duty cycle operation | Enables dropout mode down to VIN – VOUT ≈ IOUT × RDS(ON); extends runtime in battery-powered systems nearing end-of-discharge. |
| Low-noise pulse-skipping at light loads | Reduces audible noise and RF emissions below ~100mA load while maintaining ±2% output regulation without external compensation. |
| Internal soft-start | 950μs typical ramp time prevents inrush current into large output capacitors; avoids tripping upstream current-limited sources like USB ports. |
| Short-circuit protection | Forces extended low-side conduction to safely discharge inductor during output short; resumes normal operation automatically after fault removal. |
Applications
| USB Power Delivery | Supercapacitor Charging |
|---|---|
Use Scenario: Regulating 5V USB input to 3.3V for embedded microcontroller and peripheral ICs while staying within 500mA host port limit. IC Role / Device Role / Timing Role: Primary point-of-load regulator enforcing strict average input current limit to prevent USB enumeration failure or port shutdown. Use Value: Enables direct USB bus powering of complex subsystems without external current-sense amplifiers or discrete FET controllers. |
Use Scenario: Charging a 5.5V/1F supercapacitor from a 5V USB source with controlled inrush and sustained 475mA charge current. IC Role / Device Role / Timing Role: Constant-current charger using RLIM-based input current regulation; leverages 100% duty cycle to maintain regulation as supercap voltage rises. Use Value: Eliminates need for dedicated charge management ICs; supports rapid charge cycles with thermal-safe, self-limiting behavior. |
| GSM Pulse Load Support | Handheld Radio Transmitter |
Use Scenario: Supplying 3.4V/800mA to GSM module during 577μs transmit bursts with 4.7ms repetition interval. IC Role / Device Role / Timing Role: High-peak-current buck regulator using small CLIM capacitor (2.2nF) to engage input current limit within 92μs, preserving input rail stability. Use Value: Delivers burst power without collapsing USB or battery input; avoids external current-limiting circuitry and reduces BOM count. |
Use Scenario: Powering UHF transceiver IC requiring clean 2.5V/500mA with minimal output ripple and fast load transient recovery. IC Role / Device Role / Timing Role: Low-noise synchronous buck with pulse-skipping mode and 2.25MHz switching to minimize filter size and conducted EMI. Use Value: Meets stringent RF section PSRR requirements while fitting in space-constrained handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Fixed 3.3V output; 3MHz switching; no programmable input current limit; 600mA max output. | Suitable for fixed-VOUT systems where USB current compliance is managed externally or not required. | Select when simplicity and smaller solution size outweigh need for adjustable VOUT and input current limiting. |
| MAX17503GCU+T | Wider 4.5V–60V input range; 2A output; external compensation; no integrated input current limit function. | Targeted at industrial/high-voltage applications; requires external current-sense amplifier for USB-like current limiting. | Select for non-USB, higher-power, or wide-input designs where LTC3606BIDD#PBF's 5.5V max input is insufficient. |
Compared with TPS62231DRYR and MAX17503GCU+T, the LTC3606BIDD#PBF uniquely combines USB-compliant input current limiting, 0.6V–5V adjustable output, and 2.25MHz operation in a thermally enhanced 3mm × 3mm DFN - making it optimal for space-constrained, battery- or USB-powered RF and portable electronics where input source protection is critical.
Availability
LTC3606BIDD#PBF is available at Aetrix Electronics and suitable for USB-powered devices, supercapacitor charging circuits, GSM pulse-load systems, and handheld radio transmitters requiring stable component supply across automotive, industrial, and consumer production programs.
Supply support for LTC3606BIDD#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 precision analog and power management portfolio. Linear pioneered high-performance DC/DC regulators with integrated MOSFETs and advanced current-mode control.
The LTC3606BIDD#PBF belongs to Linear's monolithic synchronous buck regulator family, engineered specifically for compact, high-efficiency power conversion in USB, Li-ion, and pulsed-load applications where input current regulation and thermal performance are critical.
FAQ
What is the maximum output current capability of the LTC3606BIDD#PBF?
The LTC3606BIDD#PBF delivers up to 800mA continuous output current under typical conditions (VIN = 5V, VOUT = 3.3V, TA = 25°C). Derating is required at elevated ambient temperatures or higher VOUT/VIN ratios due to thermal limits; full 800mA is maintained across –40°C to 125°C junction temperature when the exposed pad is properly soldered to a thermal plane.
How is the input current limit programmed on the LTC3606BIDD#PBF?
The LTC3606BIDD#PBF uses an external resistor (RLIM) connected from Pin 2 to GND to set the average input current limit. For example, a 116kΩ resistor programs a 475mA limit per the formula RLIM = 55kΩ / IDC. A parallel capacitor (CLIM) filters transient sensing; 2200pF is typical for 500mA limits with sub-millisecond response.
Does the LTC3606BIDD#PBF support 100% duty cycle operation, and what is its significance?
Yes, the LTC3606BIDD#PBF supports 100% duty cycle operation, enabling low-dropout regulation when VIN approaches VOUT. This extends usable battery life in Li-ion systems by maintaining regulation down to VIN ≈ VOUT + IOUT × RDS(ON), where RDS(ON) is 0.27Ω (P-FET) at VIN = 5V.
What package type and thermal specifications apply to the LTC3606BIDD#PBF?
The LTC3606BIDD#PBF uses an 8-lead 3mm × 3mm plastic DFN with exposed thermal pad (Pin 9). Its θJA is 40°C/W; the exposed pad must be soldered to a PCB ground plane to achieve rated –40°C to 125°C junction temperature operation and sustain full 800mA output.
Can the LTC3606BIDD#PBF be used with ceramic output capacitors, and are there layout considerations?
Yes, the LTC3606BIDD#PBF is fully compatible with ceramic output capacitors due to its current-mode control loop, which does not rely on ESR for stability. Use X5R or X7R dielectrics; route the VFB trace away from SW and inductor nodes to avoid noise coupling that could degrade regulation accuracy.
LTC3606BIDD#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 ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3606BIDD#PBF FAQ
1.How can I place an order for LTC3606BIDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3606BIDD#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 LTC3606BIDD#PBF reliable?
The price and inventory of LTC3606BIDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3606BIDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3606BIDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3606BIDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3606BIDD#PBF?
LTC3606BIDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3606BIDD#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 LTC3606BIDD#PBF?
For technical support, including LTC3606BIDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3606BIDD#PBF requirements.
6.How does Aetrix verify that LTC3606BIDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3606BIDD#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 LTC3606BIDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3606BIDD#PBF?
All LTC3606BIDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3606BIDD#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 LTC3606BIDD#PBF part is unused and in its original packaging.
Return procedure for LTC3606BIDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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