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Analog Devices Inc. LTC3808EDE#TRPBF
- Part No.:
- LTC3808EDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC3808EDE#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 14-DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
LTC3808EDE#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller driving external complementary MOSFETs for high-efficiency power conversion. It operates from 2.75V to 9.8V input, delivers 0.6V to VIN output with ±1.5% reference accuracy, supports 250kHz–750kHz switching (programmable via PLLLPF), and features no-RSENSE operation using MOSFET VDS sensing - ideal for battery-powered portable instruments and notebook systems.
For engineers reviewing the LTC3808EDE#TRPBF datasheet, LTC3808EDE#TRPBF pinout, LTC3808EDE#TRPBF application, or LTC3808EDE#TRPBF equivalent, key selection criteria include its 550kHz typical oscillator frequency, 0.6V ±1.5% feedback reference, spread spectrum EMI reduction, selectable Burst Mode/Pulse Skipping/Forced Continuous operation, and thermally enhanced 4mm × 3mm DFN package with exposed pad.
Technical Context
The LTC3808EDE#TRPBF implements constant-frequency current-mode control with MOSFET VDS sensing to eliminate external sense resistors, reducing conduction loss and PCB area. Its true PLL enables precise frequency locking to external clocks from 250kHz to 750kHz, while spread spectrum modulation (460kHz–635kHz) lowers peak EMI emissions without compromising regulation.
It integrates auxiliary winding regulation via SYNC/MODE, programmable output voltage tracking via TRACK/SS, and three-state IPRG pin selection of peak sense thresholds (85mV/125mV/204mV). The controller supports 100% duty cycle for low-dropout operation and provides overvoltage protection with ±13.3% PGOOD window monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion batteries and wide-input industrial rails. |
| Output Voltage Range | 0.6V to VIN - enables adjustable low-voltage core supplies and rail-to-rail regulation. |
| Feedback Reference | 0.6V ±1.5% - ensures tight output accuracy across temperature and load for precision analog/digital supplies. |
| Switching Frequency | 250kHz to 750kHz (PLL-synchronized or programmable) - balances efficiency vs. inductor/capacitor size. |
| Quiescent Current | 9µA in shutdown - extends battery life in always-on portable systems. |
| Package | 14-lead 4mm × 3mm DFN with exposed thermal pad - delivers θJA = 130°C/W for compact, thermally constrained layouts. |
| Protection Features | Output overvoltage (±13.3%), undervoltage lockout (2.15V–2.75V), short-circuit current limiting - ensures robust system-level reliability. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed thermal pad (Pin 15 = GND, must be soldered to PCB ground).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PLLLPF (Pin 1) | Frequency set / PLL low-pass filter | Selects oscillator frequency (GND = 300kHz, floating = 550kHz, VIN = 750kHz); filters PLL loop when synchronized. |
| SYNC/MODE (Pin 2) | Auxiliary feedback / sync input / mode select | Enables external clock sync (250–750kHz), selects Burst Mode (VIN), Pulse Skipping (VFB), or Forced Continuous (GND); enables spread spectrum when biased 1.35–(VIN−0.5)V. |
| TRACK/SS (Pin 3) | Tracking input / external soft-start | Allows VOUT to track external voltage during startup; internal 1ms soft-start when tied to VIN; external capacitor sets ramp time. |
| PGOOD (Pin 4) | Open-drain power-good monitor | Pulled low when VFB deviates >±13.3% from 0.6V - signals valid regulation to system logic or sequencer. |
| VFB (Pin 5) | Feedback voltage input | Compares output divider voltage to 0.6V reference; <9nA input bias enables high-impedance resistor networks. |
| ITH (Pin 6) | Error amplifier compensation / current threshold | Sets peak inductor current limit (0.7V–2V range); determines transient response and stability via compensation network. |
| RUN (Pin 7) | Enable/shutdown control | Shuts down chip below 1.1V (9µA IQ); releases to enable startup via internal 0.7µA pull-up to VIN. |
| IPRG (Pin 8) | Peak sense voltage select | Three-state pin: float = 125mV, GND = 85mV, VIN = 204mV - configures current limit for P-MOSFET or sense resistor. |
| BG (Pin 9) | Bottom gate driver output | Drives N-channel MOSFET gate from GND to SENSE+; supports high-side synchronous rectification. |
| TG (Pin 10) | Top gate driver output | Drives P-channel MOSFET gate from GND to SENSE+; enables efficient high-side switch with no bootstrap needed. |
| SENSE+ (Pin 11) | Current sense positive input / gate drive supply | Connects to P-MOSFET source (no-RSENSE) or sense resistor top; powers TG/BG drivers. |
| VIN (Pin 12) | Signal power supply | Powers internal circuitry (excluding gate drivers); requires RC filtering (e.g., 10Ω + 1µF) for noise immunity. |
| SENSE– (Pin 13) | Current sense negative input | Connects to SW node (no-RSENSE) or sense resistor bottom; completes differential current comparator path. |
| SW (Pin 14) | Switch node connection | Connects to P-MOSFET drain, N-MOSFET drain, and inductor; serves as reverse-current detection point. |
Key Features
| Feature | Design Value |
|---|---|
| No-RSENSE operation | Eliminates external current sense resistor using MOSFET VDS sensing - improves efficiency by ~2% and reduces BOM cost/area. |
| Spread spectrum modulation | Reduces EMI peak amplitudes by spreading 550kHz fundamental across 460–635kHz - meets Class B CISPR-22 without added shielding. |
| Programmable output tracking | Enables controlled sequencing of multiple rails (e.g., core before I/O) via external voltage divider on TRACK/SS - prevents latch-up in multi-rail FPGAs. |
| True PLL synchronization | Locks internal oscillator to external clock (250–750kHz) with ±1° phase jitter - eliminates beat frequencies in multi-converter systems. |
| 100% duty cycle operation | Extends battery runtime by maintaining regulation down to VIN − VDS(ON) - critical for Li-ion discharge below 3.0V. |
Applications
| Portable Medical Instrumentation | Industrial Handheld Terminals |
|---|---|
Use Scenario: Power management in battery-operated ultrasound probes requiring ultra-low EMI to avoid signal interference with analog front-end. IC Role / Device Role / Timing Role: Synchronous buck controller regulating 1.8V/3.3V rails from dual-cell Li-ion (6.0–8.4V), using spread spectrum and no-RSENSE to minimize conducted/radiated noise. Use Value: Enables clean analog acquisition by reducing switching noise peaks by >15dB compared to fixed-frequency alternatives. | Use Scenario: Compact 5V/3.3V power tree in ruggedized barcode scanners with wide ambient temperature range (–20°C to 70°C). IC Role / Device Role / Timing Role: Primary DC/DC controller delivering regulated outputs with tracking startup, PGOOD sequencing, and low dropout at end-of-battery life. Use Value: Ensures reliable boot-up and operation across full battery voltage range (3.2V–8.4V) without brownouts or reset glitches. |
| Notebook Subsystem Power | Distributed Telecom DC Distribution |
Use Scenario: Core voltage regulation for embedded controllers and display interfaces in ultrabooks with strict thermal envelope (<2W dissipation). IC Role / Device Role / Timing Role: High-efficiency synchronous buck controller operating in Burst Mode at light loads, with 4mm × 3mm DFN package enabling dense layout near processor. Use Value: Achieves >92% efficiency at 100mA load and 85°C junction temperature - extends battery life and avoids thermal throttling. | Use Scenario: Point-of-load regulation in remote radio units where EMI must comply with 3GPP base station emission limits. IC Role / Device Role / Timing Role: Isolated secondary-side controller synchronized to master clock via PLL to eliminate subharmonic interference in RF bands. Use Value: Prevents spectral collisions in 2.6GHz LTE bands by eliminating 550kHz harmonics through precise frequency alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2315DJ-LF-Z | Fixed 500kHz frequency, no PLL sync, no spread spectrum, integrated MOSFETs (3A), smaller 3mm × 3mm QFN. | Targeted at cost-sensitive, lower-current (<3A) applications where board space is critical but EMI control is less stringent. | Select MP2315DJ-LF-Z only if integrated power stage suffices and external MOSFET flexibility is not required. |
| LTC3892EFE#PBF | Dual-output, 40V max input, higher voltage rating, wider temp range (–40°C to 125°C), more complex compensation. | Suitable for automotive or industrial 12V/24V input systems requiring fault tolerance and extended temperature operation. | Choose LTC3892EFE#PBF when dual-rail generation, higher input voltage, or AEC-Q200 compliance is mandatory. |
Compared with MP2315DJ-LF-Z and LTC3892EFE#PBF, the LTC3808EDE#TRPBF uniquely balances programmable frequency, spread spectrum EMI reduction, no-RSENSE efficiency, and compact DFN packaging - making it optimal for portable Li-ion systems demanding both performance and size efficiency.
Availability
LTC3808EDE#TRPBF is available at Aetrix Electronics and suitable for portable instrumentation, notebook subsystems, and distributed telecom DC distribution requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3808EDE#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 power management semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC3808EDE#TRPBF belongs to ADI's high-efficiency synchronous controller product line, designed specifically for battery-powered portable electronics requiring low EMI, precise tracking, and flexible operating modes without external sense resistors.
FAQ
What is the maximum supported switching frequency for LTC3808EDE#TRPBF?
The LTC3808EDE#TRPBF supports a maximum switching frequency of 750kHz when the PLLLPF pin is tied to VIN. In unsynchronized operation, the typical frequency is 550kHz (PLLLPF floating) or 300kHz (PLLLPF grounded). When externally synchronized, the device locks to input clocks from 250kHz to 750kHz - verified in the Electrical Characteristics table under "Oscillator Frequency" and "Phase-Locked Loop Lock Range".
Does LTC3808EDE#TRPBF require an external current sense resistor?
No, the LTC3808EDE#TRPBF does not require an external current sense resistor. It uses MOSFET VDS sensing via the SENSE+/SENSE– inputs to detect inductor current - a feature explicitly labeled "No RSENSE" in its official documentation. This architecture eliminates sense resistor losses and PCB area, improving efficiency by up to 2% in typical 1–3A applications.
How does the TRACK/SS pin function in LTC3808EDE#TRPBF?
The TRACK/SS pin on the LTC3808EDE#TRPBF serves dual roles: as a tracking input for coordinated startup of multiple rails or as an external soft-start control. When tied to VIN, it activates the internal 1ms soft-start ramp; when connected to an external voltage divider, it allows VOUT to track that reference. This functionality is confirmed in the "Pin Functions" section and Figure 11 circuit diagram of the datasheet.
What protection features are integrated into LTC3808EDE#TRPBF?
The LTC3808EDE#TRPBF integrates output overvoltage protection (trip at +13.3% of 0.6V reference), undervoltage lockout (UVLO active below 2.15V–2.75V), short-circuit current limiting (via IPRG-selectable thresholds), and reverse-current prevention. These protections are documented in the "Electrical Characteristics" table and "Operation" section, ensuring safe operation under fault conditions without external components.
Is LTC3808EDE#TRPBF compatible with forced continuous conduction mode?
Yes, the LTC3808EDE#TRPBF supports forced continuous conduction mode (CCM) by grounding the SYNC/MODE pin. In this mode, the controller maintains constant-frequency operation regardless of load, allowing inductor current reversal for lowest output ripple - confirmed in the "Features" list and "Light Load Operation" subsection of the datasheet. CCM is ideal for noise-sensitive analog circuits where audio-band ripple must be minimized.
LTC3808EDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 2.75V ~ 9.8V
- Frequency - Switching:
- 250kHz ~ 750kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Tracking
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-DFN (4x3)
LTC3808EDE#TRPBF FAQ
1.How can I place an order for LTC3808EDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3808EDE#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 LTC3808EDE#TRPBF reliable?
The price and inventory of LTC3808EDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3808EDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3808EDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3808EDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3808EDE#TRPBF?
LTC3808EDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3808EDE#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 LTC3808EDE#TRPBF?
For technical support, including LTC3808EDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3808EDE#TRPBF requirements.
6.How does Aetrix verify that LTC3808EDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3808EDE#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 LTC3808EDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3808EDE#TRPBF?
All LTC3808EDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3808EDE#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 LTC3808EDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3808EDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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