My Inquiry
My Account
Analog Devices Inc. LTC7803IMSE#PBF
- Part No.:
- LTC7803IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803IMSE#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:4,115
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7803IMSE#PBF from Analog Devices is a high-performance, 100% duty cycle capable, synchronous step-down DC/DC controller driving all-N-channel MOSFET stages. It operates from 4.5V to 40V input, delivers up to 40V output, achieves 12µA no-load quiescent current, and supports spread spectrum operation for EMI reduction - used in automotive power supplies requiring high efficiency and low noise.
For engineers reviewing the LTC7803IMSE#PBF datasheet, LTC7803IMSE#PBF pinout, LTC7803IMSE#PBF application, or LTC7803IMSE#PBF equivalent, key selection factors include its 3MHz programmable switching frequency, OPTI-LOOP compensation, RSENSE/DCR current sensing flexibility, PassThru™ capability, and AEC-Q100 qualification for automotive-grade reliability.
Technical Context
The LTC7803IMSE#PBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz) and integrated spread spectrum dithering to suppress conducted/EMI emissions. Its dual-mode gate drivers support 100% duty cycle operation via internal charge pump, enabling dropout-free regulation down to VOUT ≈ VIN.
It features three selectable light-load operating modes - Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction - controlled by the MODE pin. The ITH pin serves as both error amplifier output and current limit programming node, while OPTI-LOOP allows stable loop compensation across wide output capacitance and ESR ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery range including cold-crank (4.5V) and load-dump (40V) transients. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on vehicle modules like telematics or ADAS sensors. |
| Switching Frequency | Programmable 100kHz–3MHz (via FREQ pin resistor) - enables compact magnetics and noise shaping for EMI compliance. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.2%) - tight tolerance ensures accurate output regulation across temperature and load. |
| Current Sense Threshold | 45mV to 55mV max - supports low-loss RSENSE or DCR sensing with minimal power loss in high-current designs. |
| Duty Cycle Capability | 100% - enables PassThru™ operation for seamless transition into dropout, critical for automotive infotainment rail tracking. |
| Shutdown Current | 1.2µA - meets ultra-low-power requirements for ignition-off subsystems. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), thermally enhanced with exposed GND pad (Pin 17). RoHS-compliant, lead-free finish. Rated for –40°C to +125°C junction temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TRACK/SS (Pin 1) | Soft-start & tracking input | Internal 12.5µA pull-up charges external capacitor for linear VOUT ramp; enables supply tracking during startup. |
| SENSE+ / SENSE– (Pins 2,3) | Differential current sense inputs | Measure voltage across RSENSE or inductor DCR to set peak current limit; SENSE– also sources sleep-mode bias current. |
| VFB (Pin 4) | Error amplifier feedback input | Compares output divider voltage to 0.8V reference; sets regulated output voltage with ±1.2% accuracy. |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls current limit threshold and loop stability; connects to RC network for OPTI-LOOP compensation. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V threshold enables operation; <0.7V forces shutdown (1.2µA IQ); supports external UVLO implementation. |
| FREQ (Pin 7) | VCO frequency programming | GND = 375kHz, INTVCC = 2.25MHz, resistor-to-GND sets 100kHz–3MHz - enables EMI optimization and layout flexibility. |
| PLLIN/SPREAD (Pin 8) | Sync input / spread spectrum select | External clock sync (0.1–3MHz) or INTVCC = enable spread spectrum; reduces peak EMI without changing average frequency. |
| MODE (Pin 9) | Light-load mode select | GND = Burst Mode (12µA IQ), INTVCC = forced CCM, resistor-to-INTVCC = pulse-skipping - balances efficiency vs. output ripple. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and control logic; requires ≥4.7µF ceramic decoupling; bypassed by EXTVCC when >4.7V present. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Enables high-efficiency auxiliary supply (e.g., post-regulated 5V) to power INTVCC, reducing VIN-referred IQ. |
| VIN (Pin 12) | Main input supply | Bias source for internal VIN LDO; requires local ceramic bypass to GND; withstands 40V absolute max. |
| BG (Pin 13) | Bottom N-MOSFET gate driver | Drives synchronous rectifier with 1.5Ω pull-down / 3Ω pull-up; rail-to-rail swing (GND to INTVCC). |
| BOOST (Pin 14) | Bootstrap supply for top driver | Charged via external Schottky diode; supports 100% duty cycle via internal charge pump during dropout. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating driver with INTVCC-superimposed swing on SW node; optimized for fast rise/fall (<25ns) and low shoot-through risk. |
| SW (Pin 16) | Switch node connection | Connects to inductor and BOOST capacitor; handles full switching dv/dt; must be routed with minimal parasitic inductance. |
| GND (Pin 17, Exposed Pad) | Power & signal ground | Common return for MOSFET sources, input/output caps, and small-signal circuitry; must be soldered for θJA = 40°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak radiated/conducted EMI by spreading oscillator energy over ±10% bandwidth - simplifies automotive CISPR 25 Class 5 compliance. |
| OPTI-LOOP Compensation | Enables stable loop response across 10× variation in output capacitance and ESR - eliminates re-tuning when changing bulk cap types (e.g., polymer → MLCC). |
| PassThru™ / 100% Duty Cycle | Maintains regulation even when VIN ≤ VOUT + VDS(ON), avoiding hard dropout in automotive start-stop scenarios. |
| AEC-Q100 Qualified | Rated for automotive applications (Grade I: –40°C to +125°C); includes stress testing per AEC-Q100 Rev H - suitable for under-hood ECUs. |
| RSENSE or DCR Sensing | Supports either discrete shunt resistors (low cost, precision) or inductor DCR (no extra component, lower loss) - increases design flexibility. |
| Low Shutdown IQ (1.2µA) | Meets ISO 16750-2 "ignition off" leakage limits for always-connected vehicle modules - prevents battery drain over extended parking. |
Applications
| Automotive Infotainment Power | Industrial 24V Rail Regulator |
|---|---|
|
Use Scenario: Powering SoC, display, and audio subsystems in head units with wide input (6V–16V) and strict EMI limits. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating 5V/3.3V rails from battery; manages burst-mode transitions during low-power states. Use Value: 12µA quiescent current prevents battery discharge during vehicle sleep; spread spectrum meets CISPR 25 Class 5 without added filters. |
Use Scenario: Converting 24V industrial bus to 12V/5V for PLC I/O modules operating in noisy factory environments. IC Role / Device Role / Timing Role: High-efficiency step-down controller with programmable 375kHz–2.25MHz switching; synchronized to system clock via PLLIN. Use Value: Phase-lockable frequency avoids beat frequencies with other switching supplies; 40V abs max rating handles 24V bus transients. |
| Military Avionics DC-DC Stage | Telecom Remote Radio Unit |
|
Use Scenario: Generating stable 3.3V/1.8V rails for FPGA and ADCs in airborne radar systems with extreme temperature and EMI demands. IC Role / Device Role / Timing Role: AEC-Q100 qualified controller delivering 100% duty cycle capability and robust current-mode control under rapid load steps. Use Value: –40°C to +125°C operation ensures reliability at altitude; OPTI-LOOP maintains stability across wide-temp capacitors. |
Use Scenario: Efficiently stepping down 48V PoE++ or telecom rectified input to 12V intermediate bus in outdoor small cells. IC Role / Device Role / Timing Role: Wide-input (4.5V–40V) synchronous controller supporting high-frequency operation (up to 3MHz) for compact magnetics. Use Value: 3MHz capability reduces inductor size by >50% vs. 500kHz designs; RSENSE/DCR flexibility accommodates thermal constraints in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2918GQ-Z | Fixed 600kHz frequency, no spread spectrum, 25µA IQ, non-AEC-Q100 | Lower cost for non-automotive industrial use; lacks EMI mitigation and automotive qualification | Select when EMI filtering budget is available and automotive qualification is unnecessary. |
| LM5145QPWPRQ1 | 4.5V–60V input, 1.5µA shutdown IQ, no spread spectrum, 100% duty cycle supported | Broadest input range; higher VIN max suits 48V telecom; lacks integrated spread spectrum for EMI reduction | Prefer for 48V systems where input exceeds 40V; add external EMI filters if CISPR 25 compliance required. |
Compared with MP2918GQ-Z and LM5145QPWPRQ1, the LTC7803IMSE#PBF uniquely combines ultra-low 12µA IQ, integrated spread spectrum, AEC-Q100 qualification, and 3MHz programmability - making it optimal for space-constrained, EMI-sensitive automotive and avionics power stages where efficiency and regulatory compliance are co-prioritized.
Availability
LTC7803IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V power conversion, military avionics, and telecom remote radio unit designs requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant performance.
Supply support for LTC7803IMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC7803IMSE#PBF belongs to Analog Devices' Power by Linear™ controller family, engineered specifically for high-efficiency, low-EMI, wide-input synchronous buck regulation in demanding automotive and industrial environments.
FAQ
What is the maximum input voltage rating for the LTC7803IMSE#PBF?
The LTC7803IMSE#PBF has an absolute maximum input voltage (VIN) rating of 40V. Its operational input range is specified from 4.5V to 40V, making it suitable for 12V and 24V automotive systems including load-dump conditions. Exceeding 40V may cause permanent damage per Absolute Maximum Ratings.
Does the LTC7803IMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803IMSE#PBF supports true 100% duty cycle operation via its internal charge pump and BOOST circuitry, enabling PassThru™ functionality. When VIN approaches VOUT, the controller sustains top-FET conduction without dropout - critical for automotive start-stop and low-VIN scenarios. This is confirmed in the datasheet's "PassThru™/100% Duty Cycle Capable" feature list and functional diagram.
How does spread spectrum operation reduce EMI in the LTC7803IMSE#PBF?
The LTC7803IMSE#PBF reduces peak conducted and radiated EMI by modulating its switching frequency ±10% around the nominal value when PLLIN/SPREAD is tied to INTVCC. This spreads spectral energy across a wider bandwidth, lowering amplitude at any single frequency - easing compliance with CISPR 25 Class 5 and FCC Part 15 without adding external filters or shielding.
What are the light-load operating modes available on the LTC7803IMSE#PBF, and how are they selected?
The LTC7803IMSE#PBF offers three light-load modes: Burst Mode (MODE = GND), pulse-skipping (MODE = INTVCC via 100kΩ), and forced continuous conduction (MODE = INTVCC). Burst Mode delivers 12µA IQ; pulse-skipping balances ripple and efficiency; forced CCM ensures lowest output ripple. Selection is hardware-configured via the MODE pin, with no software or register access required.
Is the LTC7803IMSE#PBF pin-compatible with other members of the LTC78xx family?
No, the LTC7803IMSE#PBF is not pin-compatible with earlier LTC78xx controllers (e.g., LTC7801/LTC7802). Its 16-pin MSOP/QFN layout, pin functions (e.g., dedicated PLLIN/SPREAD and TRACK/SS pins), and internal architecture differ significantly. Migration requires PCB redesign and firmware validation - confirmed by distinct pin configuration diagrams and functional block differences in the datasheet.
LTC7803IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- 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):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 3MHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Phase Control
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7803IMSE#PBF FAQ
1.How can I place an order for LTC7803IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803IMSE#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 LTC7803IMSE#PBF reliable?
The price and inventory of LTC7803IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803IMSE#PBF?
LTC7803IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803IMSE#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 LTC7803IMSE#PBF?
For technical support, including LTC7803IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803IMSE#PBF requirements.
6.How does Aetrix verify that LTC7803IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803IMSE#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 LTC7803IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803IMSE#PBF?
All LTC7803IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803IMSE#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 LTC7803IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7803IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7803IMSE#PBF 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…
