My Inquiry
My Account
Analog Devices Inc. LTC3808EGN#TRPBF
- Part No.:
- LTC3808EGN#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3808EGN#TRPBF.pdf
- Description:
- IC REG CTRLR BUCK 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,028
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC3808EGN#TRPBF from Analog Devices (formerly Linear Technology) is a synchronous step-down DC/DC controller IC that drives external complementary P- and N-channel MOSFETs without requiring a current-sense resistor. It delivers 0.6V ±1.5% reference accuracy, supports 2.75V–9.8V input and 0.6V–VIN output ranges, operates at 550kHz (typ), and enables low-EMI operation via spread spectrum modulation - ideal for battery-powered portable computing and instrumentation.
For engineers reviewing the LTC3808EGN#TRPBF datasheet, LTC3808EGN#TRPBF pinout, LTC3808EGN#TRPBF application, or LTC3808EGN#TRPBF equivalent, this page provides verified package mapping (16-lead SSOP), confirmed pin functions (e.g., TRACK/SS for ratiometric soft-start, IPRG for peak sense threshold selection), real-world efficiency curves (≥90% at 2A, VIN=4.2V, VOUT=2.5V), and validated alternatives with documented functional trade-offs.
Technical Context
The LTC3808EGN#TRPBF implements constant-frequency current-mode control using MOSFET VDS sensing to eliminate RSENSE, enabling high-efficiency operation down to micropower shutdown (9µA). Its architecture integrates a true PLL for frequency locking (250–750kHz), selectable light-load modes (Burst Mode, pulse skipping, forced continuous), and auxiliary winding regulation via the SYNC/MODE pin.
It features integrated protection including output overvoltage detection (trip at 0.68V on VFB), reverse-current prevention, short-circuit limiting via ∆VSC monitoring, and 100% duty-cycle dropout operation. The ITH pin serves dual roles: error amplifier compensation node and peak current threshold setpoint (0.7–2.0V range), directly governing inductor current limit.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.75V to 9.8V - supports single/dual Li-ion batteries and intermediate bus rails without external LDO pre-regulation. |
| Output Voltage Range | 0.6V to VIN - enables adjustable low-voltage core supplies (e.g., 1.2V, 1.8V, 2.5V) with 0.6V ±1.5% reference tolerance. |
| Switching Frequency | 550kHz (typ, PLLLPF floating) - balances efficiency and compact magnetics; programmable from 250kHz to 750kHz via PLLLPF/SYNC/MODE pins. |
| Quiescent Current | 9µA in shutdown - extends battery runtime in always-on portable systems during deep sleep states. |
| Peak Gate Drive Current | 1A (TG/BG, <10µs) - ensures fast turn-on/turn-off of external power MOSFETs, minimizing switching losses. |
| Current Sense Threshold | 125mV (IPRG floating) - sets maximum ∆VSENSE across P-MOSFET; configurable to 85mV or 204mV via IPRG pin. |
| Soft-Start Time | 0.74ms (internal) - controls inrush current during power-up; externally programmable via capacitor on TRACK/SS pin. |
Pinout & Package
Package: 16-lead plastic SSOP (GN), 4.9mm × 6.0mm body, exposed pad (Pin 15) soldered to PCB ground for thermal and electrical performance (θJA = 37°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 9) | Ground reference | Common return for internal logic, gate drivers, and reverse-current comparator; exposed pad must be soldered to PCB ground plane. |
| PLLLPF (Pin 2) | PLL filter / frequency select | When unsynchronized: sets oscillator frequency (GND = 300kHz, VIN = 750kHz, floating = 550kHz); when synchronized: low-pass filter node for PLL loop. |
| SYNC/MODE (Pin 3) | Multi-function control | Selects operating mode (Burst/Pulse Skip/Forced Continuous), enables spread spectrum, accepts external sync clock (250–750kHz), or serves as auxiliary feedback input. |
| TRACK/SS (Pin 4) | Tracking/soft-start input | Enables ratiometric start-up tracking of external voltage or programs external soft-start time via capacitor to GND. |
| PGOOD (Pin 5) | Open-drain status output | Pulled low when VFB deviates >±10% from 0.6V reference - signals valid output regulation to system supervisor or sequencer. |
| VFB (Pin 6) | Feedback input | Monitors scaled output voltage via external resistor divider; compared to 0.6V reference to regulate output with ±1.5% accuracy. |
| ITH (Pin 7) | Error amp output / current limit | Compensation node and peak current threshold setpoint (0.7–2.0V); determines inductor peak current and loop stability. |
| RUN (Pin 8) | Enable control | Shuts down controller when <1.1V (9µA IQ); released to VIN enables start-up via TRACK/SS or internal soft-start ramp. |
| IPRG (Pin 10) | Current sense threshold select | Three-state pin selecting max ∆VSENSE: GND = 85mV, floating = 125mV, VIN = 204mV - adapts to MOSFET RDS(on) or sense resistor value. |
| BG (Pin 11) | Bottom gate driver | Drives N-channel MOSFET gate (0–SENSE+ swing); includes anti-shoot-through logic and reverse-current detection. |
| TG (Pin 12) | Top gate driver | Drives P-channel MOSFET gate (0–SENSE+ swing); supports 100% duty cycle for ultra-low dropout operation. |
| SENSE+ (Pin 13) | Current sense positive input | Connects to P-MOSFET source (no RSENSE) or sense resistor top; powers gate drivers and serves as local supply for TG/BG. |
| VIN (Pin 14) | Signal supply input | Powers internal circuitry (excluding gate drivers); requires RC filtering (e.g., 10Ω + 1µF) to suppress noise coupling into control loops. |
| SENSE– (Pin 15) | Current sense negative input | Connects to SW node (no RSENSE) or sense resistor bottom; differential input with SENSE+ forms current comparator. |
| SW (Pin 16) | Switch node | Connects to P-MOSFET drain, N-MOSFET drain, and inductor; serves as switch-node input for reverse-current and short-circuit detection. |
Key Features
| Feature | Design Value |
|---|---|
| No RSENSE operation | Eliminates power loss and board space associated with external current-sense resistors by using MOSFET VDS sensing. |
| Spread spectrum modulation | Reduces EMI peak amplitudes by dithering switching frequency between 460kHz and 635kHz - critical for FCC/CE compliance in portable devices. |
| True PLL synchronization | Locks internal oscillator to external clock (250–750kHz), enabling deterministic timing and multi-phase interleaving without beat frequencies. |
| Programmable output tracking | Allows VOUT to ramp in precise ratio with external voltage (e.g., FPGA core/VCCIO sequencing) using resistor divider on TRACK/SS pin. |
| 100% duty-cycle dropout | Maintains regulation even when VIN ≈ VOUT by holding TG high continuously - extends usable battery range in Li-ion systems. |
| Three light-load operating modes | Burst Mode (93% efficiency @ 10mA), Pulse Skipping (low ripple/no audio noise), Forced Continuous (lowest output ripple, higher IQ) - selectable per application need. |
Applications
| Portable Computing Power | Multi-Rail Sequencing |
|---|---|
|
Use Scenario: Powering CPU core, memory, and I/O rails in ultraportable notebooks and tablets powered by 1–2 cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 1.2V/1.8V/3.3V rails with tight load transient response and low-noise operation. Use Value: Delivers >90% efficiency at 2A (VIN=4.2V, VOUT=2.5V) while meeting stringent EMI limits via spread spectrum and Burst Mode at light loads. |
Use Scenario: Coordinating power-up sequence of FPGA, DSP, and analog subsystems requiring controlled voltage ramp rates and inter-rail dependencies. IC Role / Device Role / Timing Role: Tracking controller synchronizing multiple LTC3808EGN#TRPBF outputs to match external reference ramps (e.g., VCCINT before VCCAUX). Use Value: Enables ratiometric start-up via TRACK/SS pin with external resistor dividers - eliminates need for discrete sequencers or complex firmware timing. |
| Battery-Powered Instrumentation | Distributed DC Power Systems |
|
Use Scenario: Providing stable, low-noise 3.3V and 5V supplies for handheld test equipment, medical sensors, and data loggers. IC Role / Device Role / Timing Role: High-efficiency, low-quiescent-current DC/DC controller supporting micropower sleep (9µA shutdown) and fast wake-up. Use Value: Extends battery life with Burst Mode operation (IQ = 105µA typ at light load) and maintains regulation down to 2.75V input - compatible with aging Li-ion cells. |
Use Scenario: Local point-of-load regulation in telecom or industrial backplanes where intermediate 5V/12V buses feed multiple isolated or non-isolated converters. IC Role / Device Role / Timing Role: Synchronous buck controller accepting wide-input (2.75–9.8V) intermediate bus and delivering tightly regulated low-voltage outputs. Use Value: Supports PLL synchronization to system clock for EMI reduction across multiple converters and enables auxiliary winding regulation for isolated secondary-side control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3850IGN#TRPBF | Higher frequency range (500kHz–4MHz), integrated MOSFET drivers with 3A peak current, no IPRG pin - uses fixed 50mV current sense threshold. | Targets smaller inductors/capacitors and higher-density designs; lacks RSENSE-free operation and tracking capability of LTC3808EGN#TRPBF. | Choose LTC3850IGN#TRPBF when board space is constrained and fixed 50mV sensing suffices; retain LTC3808EGN#TRPBF for no-RSENSE flexibility and precise rail tracking. |
| TPS54332DR | Fixed 500kHz frequency, integrated high-side MOSFET, 3.5A output, no spread spectrum or PLL sync - uses external current-sense resistor. | Offers lower BOM count (integrated FET) but sacrifices EMI performance, input voltage range (3.5–28V), and advanced light-load modes of LTC3808EGN#TRPBF. | Choose TPS54332DR for cost-sensitive, medium-power applications where integrated FET simplifies layout; prefer LTC3808EGN#TRPBF for ultra-low EMI, wide VIN, and battery-optimized efficiency. |
Compared with LTC3850IGN#TRPBF and TPS54332DR, the LTC3808EGN#TRPBF uniquely combines RSENSE-free operation, programmable output tracking, spread spectrum EMI reduction, and true PLL synchronization - making it optimal for portable, battery-critical, and noise-sensitive multi-rail systems where design flexibility and regulatory compliance are paramount.
Availability
LTC3808EGN#TRPBF is available at Aetrix Electronics and suitable for portable computing power supplies, multi-rail FPGA sequencing, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC3808EGN#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 LTC3808EGN#TRPBF belongs to ADI's Power by Linear™ family of high-efficiency DC/DC controllers, designed specifically for demanding portable, industrial, and communications applications requiring low EMI, wide input range, and flexible sequencing capabilities.
FAQ
What is the maximum input voltage rating for the LTC3808EGN#TRPBF?
The absolute maximum input voltage (VIN) for the LTC3808EGN#TRPBF is 10V. Its operational input range is specified from 2.75V to 9.8V, making it suitable for 1–2 cell Li-ion battery systems and intermediate bus rails. Exceeding 10V risks permanent damage to internal circuitry, including the RUN, PLLLPF, and SYNC/MODE pins, which have voltage limits referenced to VIN.
Does the LTC3808EGN#TRPBF require an external current-sense resistor?
No, the LTC3808EGN#TRPBF does not require an external current-sense resistor. It implements No RSENSE operation by sensing the voltage drop across the external P-channel MOSFET's RDS(on) using the SENSE+ and SENSE– pins. This reduces power loss, board area, and cost - though an optional sense resistor may be used for higher accuracy or when driving N-channel high-side switches.
How does the TRACK/SS pin function in the LTC3808EGN#TRPBF?
The TRACK/SS pin on the LTC3808EGN#TRPBF serves dual purposes: it enables ratiometric output voltage tracking during start-up (by connecting an external resistor divider to a reference voltage) or acts as an external soft-start input (by adding a capacitor to ground). When tied to VIN, it activates the internal 0.74ms soft-start ramp - ensuring controlled inrush current and stable regulation without external components.
What are the key differences between Burst Mode and Forced Continuous operation on the LTC3808EGN#TRPBF?
Burst Mode operation (SYNC/MODE = VIN) maximizes light-load efficiency (e.g., 93% at 10mA) by disabling switching cycles until output droop triggers restart, resulting in low average IQ (~105µA). Forced Continuous mode (SYNC/MODE = GND) sustains constant-frequency PWM regardless of load, yielding lower output ripple and no audible noise but reduced efficiency (<80% at 10mA) due to persistent switching losses.
Can the LTC3808EGN#TRPBF synchronize to an external clock, and what is its lock range?
Yes, the LTC3808EGN#TRPBF supports true PLL synchronization via the SYNC/MODE pin, with a guaranteed lock range of 250kHz to 750kHz and a typical capture range extending from 200kHz to 1MHz. During synchronization, Burst Mode is disabled, and the internal oscillator phase-locks to the external clock's rising edge - enabling deterministic timing and EMI reduction in multi-converter systems.
LTC3808EGN#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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:
- 16-SSOP
LTC3808EGN#TRPBF FAQ
1.How can I place an order for LTC3808EGN#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3808EGN#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 LTC3808EGN#TRPBF reliable?
The price and inventory of LTC3808EGN#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3808EGN#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3808EGN#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3808EGN#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3808EGN#TRPBF?
LTC3808EGN#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3808EGN#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 LTC3808EGN#TRPBF?
For technical support, including LTC3808EGN#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3808EGN#TRPBF requirements.
6.How does Aetrix verify that LTC3808EGN#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3808EGN#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 LTC3808EGN#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3808EGN#TRPBF?
All LTC3808EGN#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3808EGN#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 LTC3808EGN#TRPBF part is unused and in its original packaging.
Return procedure for LTC3808EGN#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC3808EGN#TRPBF Tags
-
UCC28C45DR
Texas Instruments
-
UCC28C40DR
Texas Instruments
-
UCC28C43DR
Texas Instruments
-
ZXSC410E6TA
Diodes Incorporated
-
LM3524DMX/NOPB
Texas Instruments
-
LM3489MMX/NOPB
Texas Instruments
-
MIC2102YML-TR
Microchip Technology
-
LM5148RGYR
Texas Instruments
-
TL598CDR
Texas Instruments
-
LM5155DSSR
Texas Instruments
-
LM25085MYX/NOPB
Texas Instruments
-
UCC2813DTR-0
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
