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Analog Devices Inc. LTC3606BEDD#TRPBF
- Part No.:
- LTC3606BEDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3606BEDD#TRPBF.pdf
- Description:
- IC REG BUCK ADJ 800MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,471
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Product details
Overview
LTC3606BEDD#TRPBF from Analog Devices (formerly Linear Technology) is a monolithic synchronous step-down DC/DC regulator with programmable average input current limiting, designed for Li-ion and USB-powered 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 LTC3606BEDD#TRPBF datasheet, LTC3606BEDD#TRPBF pinout, LTC3606BEDD#TRPBF application, or LTC3606BEDD#TRPBF equivalent, key selection considerations include its 475mA programmable input current limit (±5% accuracy), PGOOD monitoring, internal soft-start (950μs), and thermally enhanced 8-lead 3mm × 3mm DFN package with exposed GND pad.
Technical Context
The LTC3606BEDD#TRPBF implements a constant-frequency current-mode architecture with an internally set 2.25MHz oscillator, enabling compact external components. Its main switch uses a P-channel MOSFET (RDS(ON) = 0.27Ω typ at 5V), while the synchronous rectifier employs an N-channel MOSFET (RDS(ON) = 0.25Ω typ).
Input current limiting is achieved by sensing voltage drop across the main PFET's RDS(ON), scaling it via matched sense PFET (1/55,000 ratio), and comparing the resulting IRLIM to a 1V threshold. The device supports pulse-skipping mode at light loads for low-noise, low-RF operation while maintaining regulation.
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 max - sufficient for powering microcontrollers, RF transceivers, and sensor subsystems in portable devices. |
| Switching Frequency | 2.25MHz (typ) - enables use of sub-2.2μH inductors and <10μF ceramic output capacitors for space-constrained layouts. |
| Feedback Reference | 0.6V ±2% - allows precise output setting down to 0.6V with standard resistor dividers; supports 1.2V, 1.8V, 3.3V, and 5V rails. |
| Input Current Limit | Programmable 475mA (±5%) via RLIM pin - protects USB ports and supercapacitor charging circuits while permitting high peak load currents. |
| Efficiency | Up to 96% - achieved at medium loads with low RDS(ON) switches and synchronous rectification, reducing thermal stress. |
| Soft-Start Time | 950μs - limits inrush current into output capacitance during power-up, preventing VIN droop and system reset events. |
| Shutdown Current | ≤1μA - ensures minimal battery drain in standby mode for always-on IoT and wearable applications. |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN with exposed GND pad (Pin 9), rated for –40°C to 85°C operating junction temperature (LTC3606BE grade). Exposed pad must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, Pin 3, Exposed Pad (Pin 9) | GND | Power and signal ground reference; connects to CIN(–), COUT(–); exposed pad is mandatory thermal path. |
| Pin 2 | RLIM | Input current limit programming node; accepts resistor-to-ground (e.g., 116kΩ for 475mA) and optional CLIM capacitor for transient response tuning. |
| Pin 4 | SW | Switch node; connects directly to inductor; swings between VIN and GND; requires tight layout to minimize EMI and ringing. |
| Pin 5 | VIN | Main power input; must be decoupled with ≥10μF low-ESR ceramic capacitor placed adjacent to pin. |
| Pin 6 | PGOOD | Open-drain power-good indicator; asserts low when VFB is within ±5% to ±11% of 0.6V; requires external pull-up. |
| Pin 7 | RUN | Enable control; high (>1.2V) enables regulator, low (<0.4V) forces shutdown with ≤1μA quiescent current. |
| Pin 8 | VFB | Feedback input; monitors resistive divider output; regulated to 0.6V with ±2% accuracy over temperature and line/load conditions. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Input Current Limit | Enables compliance with USB 2.0/3.0 current budgets while sustaining >2A peak output loads via controlled VOUT droop. |
| Low-Noise Pulse-Skipping Mode | Maintains regulation at light loads (<10mA) with minimal output ripple and no audible coil whine, critical for audio and RF-sensitive designs. |
| 100% Duty Cycle Operation | Extends battery runtime by sustaining regulation as VIN approaches VOUT; avoids premature shutdown during brownout conditions. |
| Internal Soft-Start | Prevents input capacitor inrush surges that could trip upstream current limiters or cause system-level voltage collapse on shared rails. |
| Short-Circuit Protection | Forces extended bottom-switch conduction to safely discharge inductor energy during output shorts, preventing thermal runaway and enabling auto-recovery. |
| Thermally Enhanced DFN | θJA = 40°C/W enables 800mA continuous operation at ambient temperatures up to 85°C without forced airflow or heatsinking. |
Applications
| USB-Powered Portable Instruments | Supercapacitor Backup Power Systems |
|---|---|
Use Scenario: Handheld multimeter powered from USB-C port with dynamic load ranging from 10mA (sleep) to 600mA (backlight + ADC acquisition). IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3V rail; enforces 500mA input cap via RLIM to comply with USB spec while supporting 2x peak load bursts. Use Value: Eliminates need for external current-limiting circuitry; maintains measurement accuracy during load transients by avoiding VIN droop-induced reference errors. | Use Scenario: Industrial PLC module using 5.5V/1F supercapacitor for ride-through during 20ms AC mains interruption. IC Role / Device Role / Timing Role: Bidirectional charge controller managing supercapacitor charging from 5V rail and discharging to 3.3V system rail during outage. Use Value: Programmable input current limit prevents over-stressing supercapacitor ESR during fast charging; 100% duty cycle sustains VOUT as supercap voltage decays from 5.5V to 3.3V. |
| GSM/GPRS Radio Transmitters | Wearable Health Monitors |
Use Scenario: Cellular modem in asset tracker drawing 2A pulses at 217Hz during TDMA burst transmission, supplied from single Li-ion cell. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator converting 3.6V battery to 2.8V RF PA supply; uses pulse-skipping to minimize noise coupling into sensitive RX path. Use Value: 2.25MHz switching avoids GSM receive bands (900/1800MHz); low-noise operation preserves receiver sensitivity and reduces conducted EMI filtering cost. | Use Scenario: ECG patch with ultra-low-power MCU, analog front-end, and BLE radio operating from coin-cell or thin-film battery. IC Role / Device Role / Timing Role: System power manager providing 1.8V digital rail and 3.3V analog rail; enters shutdown (<1μA) between sensor sampling intervals. Use Value: Sub-1μA shutdown current extends battery life beyond 12 months; soft-start prevents false wake-ups caused by VOUT slew-induced glitches on reset lines. |
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 | Fixed 1.8V output; 1.8MHz switching; 1.2A rating; no programmable input current limit. | Suitable for fixed-voltage digital rails only; lacks USB-compliant input limiting for variable-output or charging applications. | Select when output voltage is fixed and higher current headroom is needed; not suitable for input-limited or adjustable-VOUT designs. |
| MAX20077ATC+T | 2.2V–5.5V input; 3A output; integrated FETs; ±1.5% VFB accuracy; no RLIM pin or input current limiting. | Higher current capability but no input current control; intended for automotive infotainment rather than USB/portable power. | Choose for higher-power industrial applications where input current budgeting is not required and thermal margin is critical. |
Compared with TPS6286418RTER and MAX20077ATC+T, the LTC3606BEDD#TRPBF uniquely combines programmable input current limiting, 0.6V feedback for wide VOUT adjustability, and 2.25MHz operation in a thermally optimized 3mm × 3mm DFN-making it optimal for USB-compliant, space-constrained, and battery-sensitive designs.
Availability
LTC3606BEDD#TRPBF is available at Aetrix Electronics and suitable for USB-powered portable instruments, supercapacitor backup power systems, GSM radio transmitters, and wearable health monitors requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3606BEDD#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, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3606B belongs to ADI's Power by Linear™ family of high-efficiency DC/DC regulators, engineered specifically for portable, USB-compliant, and battery-operated systems demanding precision input current control and minimal board area.
FAQ
What is the maximum output current capability of the LTC3606BEDD#TRPBF?
The LTC3606BEDD#TRPBF delivers up to 800mA of continuous output current under typical thermal conditions (TA = 25°C, 2-layer PCB, exposed pad soldered). Derating applies above 85°C ambient; full 800mA is maintained up to 85°C junction temperature with proper thermal design. Peak transient loads exceeding 800mA are supported via controlled VOUT droop when input current limiting engages.
How is the input current limit programmed on the LTC3606BEDD#TRPBF?
The LTC3606BEDD#TRPBF input current limit is set by connecting a resistor (RLIM) from Pin 2 to GND. For example, a 116kΩ resistor programs a 475mA limit (±5% accuracy). The relationship is RLIM = 55kΩ / IDC. A capacitor (CLIM) in parallel with RLIM filters transients; values from 100pF to 1μF are stable, with larger values slowing response time to load steps.
Does the LTC3606BEDD#TRPBF support adjustable output voltage, and what is the minimum achievable value?
Yes, the LTC3606BEDD#TRPBF supports fully adjustable output voltage from 0.6V to 5V using an external resistor divider on the VFB pin. The minimum output is set by the internal 0.6V reference voltage; with appropriate resistor selection (e.g., R1 = 100kΩ, R2 = 0Ω for 0.6V), the regulator maintains ±2% accuracy across line, load, and temperature.
What package type and thermal characteristics does the LTC3606BEDD#TRPBF have?
The LTC3606BEDD#TRPBF is housed in an 8-lead 3mm × 3mm plastic DFN package with an exposed GND pad (Pin 9). Its thermal resistance is θJA = 40°C/W on a 2-layer PCB with 1-in² copper pour under the exposed pad. This enables 800mA continuous operation at 85°C ambient without forced airflow when the pad is properly soldered.
Can the LTC3606BEDD#TRPBF operate in dropout, and how does it behave below VOUT?
Yes, the LTC3606BEDD#TRPBF supports 100% duty cycle operation for low-dropout behavior. When VIN drops near VOUT, the P-channel main switch remains continuously on, delivering VOUT ≈ VIN − IOUT × RDS(ON). RDS(ON) increases at lower VIN, so worst-case power dissipation must be calculated at minimum input voltage to ensure thermal safety.
LTC3606BEDD#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 ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3606BEDD#TRPBF FAQ
1.How can I place an order for LTC3606BEDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3606BEDD#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 LTC3606BEDD#TRPBF reliable?
The price and inventory of LTC3606BEDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3606BEDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3606BEDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3606BEDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3606BEDD#TRPBF?
LTC3606BEDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3606BEDD#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 LTC3606BEDD#TRPBF?
For technical support, including LTC3606BEDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3606BEDD#TRPBF requirements.
6.How does Aetrix verify that LTC3606BEDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3606BEDD#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 LTC3606BEDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3606BEDD#TRPBF?
All LTC3606BEDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3606BEDD#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 LTC3606BEDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3606BEDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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