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Analog Devices Inc. LTC7803JMSE#WTRPBF
- Part No.:
- LTC7803JMSE#WTRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803JMSE#WTRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:2,318
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Product details
Overview
LTC7803JMSE#WTRPBF 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 conversion systems requiring robust thermal performance and AEC-Q100 compliance.
For engineers reviewing the LTC7803JMSE#WTRPBF datasheet, LTC7803JMSE#WTRPBF pinout, LTC7803JMSE#WTRPBF application, or LTC7803JMSE#WTRPBF equivalent, key selection criteria include its 16-pin MSOP package with exposed GND pad, –40°C to 150°C junction temperature rating, 3MHz programmable switching frequency, OPTI-LOOP compensation, and selectable light-load modes (Burst, pulse-skipping, continuous).
Technical Context
The LTC7803JMSE#WTRPBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz) and integrated spread spectrum dithering. Its dual-mode gate drivers support 100% duty cycle via internal charge pump, enabling dropout-free operation down to VOUT ≈ VIN.
It features RSENSE or DCR current sensing, OPTI-LOOP compensation for wide output capacitance/ESR tolerance, and three light-load operating modes selected via MODE pin: Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction - all with independent ITH-based current limit programming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide automotive battery transients and industrial 24V/36V rails. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends runtime in always-on vehicle modules. |
| Switching Frequency | Programmable 100kHz to 3MHz - enables compact magnetics and noise shaping for EMI-critical layouts. |
| Output Voltage Range | 0.8V to 40V - configurable via external resistor divider; supports post-regulation and high-side buck applications. |
| Operating Junction Temp | –40°C to +150°C - qualified per AEC-Q100 Grade 1, suitable for under-hood automotive environments. |
| Package | 16-lead MSOP with exposed GND pad - thermally enhanced for 10°C/W θJC, requires PCB soldering of exposed pad. |
| Current Sensing | RSENSE or DCR - flexible layout integration with low-side or inductor DCR sensing options. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE), 3mm × 4.9mm body, exposed thermal pad (Pin 17 = GND). Requires soldering of exposed pad to PCB ground plane for rated thermal performance (θJA = 40°C/W, θJC = 10°C/W).
| 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 | Set peak inductor current threshold; support RSENSE or DCR sensing with ±1µA input bias. |
| VFB (Pin 4) | Error amplifier feedback input | Regulates output to 0.792–0.808V reference; connects to resistor divider for precise VOUT setting. |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls current limit threshold; external RC network sets loop stability across wide COUT/ESR range. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V rising threshold enables regulation; <0.7V forces shutdown (1.2µA IQ); supports UVLO implementation. |
| FREQ (Pin 7) | VCO frequency programming | Resistor-to-GND sets 100kHz–3MHz; INTVCC = 2.25MHz, GND = 375kHz - enables EMI optimization. |
| PLLIN/SPREAD (Pin 8) | Synchronization & spread spectrum select | External clock input for phase-locking; tied to INTVCC for spread spectrum, GND to disable. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode (12µA IQ), INTVCC = forced continuous, 100kΩ-to-INTVCC = pulse-skipping. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and control logic; requires ≥4.7µF ceramic decoupling to GND. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Enables bypass of VIN LDO when >4.7V applied - reduces input-referred IQ in multi-rail systems. |
| VIN (Pin 12) | Main input supply | Bias source for internal circuits when EXTVCC not used; requires local ceramic bypass to GND. |
| 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; enables 100% duty cycle via internal charge pump during dropout. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating driver with INTVCC-referenced swing over SW node; supports high-side switch control. |
| SW (Pin 16) | Switch node connection | Connects to inductor and BOOST capacitor; carries high dv/dt switching waveform - requires tight layout. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad - must be soldered to PCB ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Spread spectrum modulation | Reduces peak conducted/radiated EMI by spreading fundamental and harmonic energy across 0–20% bandwidth - simplifies EMC certification. |
| OPTI-LOOP compensation | Allows stable loop response across 10µF–1000µF output capacitance and 0.5mΩ–50mΩ ESR - eliminates re-tuning for different capacitor types. |
| 100% duty cycle capability | Internal charge pump sustains TG drive during VIN-to-VOUT dropout - maintains regulation even at VIN ≤ VOUT + 0.5V. |
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40°C to +150°C junction temperature - meets reliability and stress test requirements for engine control units. |
| Selectably optimized light-load efficiency | Three distinct modes (Burst, pulse-skipping, continuous) enable trade-off between IQ, output ripple, and transient response - configurable without firmware. |
Applications
| Automotive Infotainment Power Supply | Industrial Motor Drive Auxiliary Rail |
|---|---|
Use Scenario: Powers 3.3V/5V logic and interface ICs in head units and ADAS displays exposed to 12V/24V battery rails with load dump transients. IC Role / Device Role / Timing Role: Primary synchronous buck controller regulating stable low-voltage rails from unregulated automotive input. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep mode; AEC-Q100 qualification ensures long-term reliability under thermal cycling. | Use Scenario: Generates isolated 15V gate drive supply for IGBTs/MOSFETs in servo drives and PLC power stages. IC Role / Device Role / Timing Role: High-input-voltage step-down controller delivering regulated auxiliary bias from main DC bus. Use Value: 40V max input withstands 36V industrial bus surges; 3MHz operation allows small, shielded inductors to minimize EMI coupling into sensitive analog sections. |
| Military Vehicle DC-DC Conversion | Telecom Base Station Backup Power |
Use Scenario: Provides 5V/12V system rails in avionics and armored vehicle electronics operating across –40°C to +85°C ambient with wide input transients. IC Role / Device Role / Timing Role: Robust, spread-spectrum-enabled controller for mission-critical power conversion where EMI immunity is mandatory. Use Value: Spread spectrum and 150°C junction rating ensure compliance with MIL-STD-461E radiated emissions limits and extended service life in sealed enclosures. | Use Scenario: Regulates backup 3.3V/5V rails from 48V telecom battery during AC mains failure. IC Role / Device Role / Timing Role: High-efficiency, low-IQ controller maintaining standby power for control logic and memory retention. Use Value: 1.2µA shutdown current minimizes battery depletion; programmable frequency avoids interference with baseband clock domains. |
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 |
|---|---|---|---|
| MP2918GL-Z | 4.5V–36V input, 12µA IQ, but lacks spread spectrum and AEC-Q100 qualification; 12-pin QFN only. | Targeted at cost-sensitive industrial SMPS, not automotive or EMI-critical designs. | Select when spread spectrum and automotive qualification are unnecessary and board space is constrained. |
| LTC3891EMSE#PBF | Same 4.5V–60V input, 15µA IQ, AEC-Q100 qualified, but fixed 150kHz–900kHz range and no PLLIN/SPREAD pin. | Used in dual-output or high-voltage boost-buck applications where synchronization is not required. | Choose when wider input range (up to 60V) and dual-phase capability outweigh need for 3MHz operation and EMI dithering. |
Compared with MP2918GL-Z and LTC3891EMSE#PBF, the LTC7803JMSE#WTRPBF uniquely combines 3MHz programmability, integrated spread spectrum, and AEC-Q100 Grade 1 qualification - making it optimal for next-generation automotive and high-EMI industrial controllers where noise suppression and thermal resilience are non-negotiable.
Availability
LTC7803JMSE#WTRPBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial motor drive auxiliary supplies, and military vehicle power conversion requiring stable component supply, AEC-Q100 compliance, and long-term lifecycle support.
Supply support for LTC7803JMSE#WTRPBF 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The LTC7803 product line delivers high-efficiency, low-quiescent-current synchronous buck controllers for demanding automotive and industrial power systems - designed specifically to replace legacy solutions requiring external compensation or lacking EMI mitigation.
FAQ
What is the maximum junction temperature rating for the LTC7803JMSE#WTRPBF?
The LTC7803JMSE#WTRPBF is rated for operation from –40°C to +150°C junction temperature and is AEC-Q100 qualified for automotive Grade 1 applications. This rating is validated per manufacturer specifications and confirmed in the Absolute Maximum Ratings table (Page 2) and Order Information table (Page 3) of the official Rev. B datasheet.
Does the LTC7803JMSE#WTRPBF support synchronization to an external clock?
Yes, the LTC7803JMSE#WTRPBF supports external clock synchronization via the PLLIN/SPREAD pin (Pin 8). When an external clock signal is applied, the internal phase-locked loop aligns the rising edge of the TG signal to the external clock's rising edge, enabling deterministic timing in multi-controller systems - as documented in the Pin Functions section (Page 9).
How does the LTC7803JMSE#WTRPBF achieve 100% duty cycle operation?
The LTC7803JMSE#WTRPBF achieves 100% duty cycle using an internal charge pump that sustains gate drive voltage on the TG pin during VIN-to-VOUT dropout conditions. This eliminates reliance on external bootstrap components and enables continuous top-FET conduction - a feature explicitly stated in the DESCRIPTION section (Page 1) and detailed in the OPERATION section (Page 11).
What is the purpose of the MODE pin on the LTC7803JMSE#WTRPBF?
The MODE pin (Pin 9) selects light-load operating behavior: grounding enables Burst Mode (12µA IQ), tying to INTVCC forces continuous conduction, and connecting through a 100kΩ resistor enables pulse-skipping. This configurability allows designers to optimize efficiency, ripple, and transient response without firmware changes - as specified in the FEATURES and PIN FUNCTIONS sections (Pages 1 and 9).
Can the LTC7803JMSE#WTRPBF operate with DCR current sensing?
Yes, the LTC7803JMSE#WTRPBF supports both RSENSE and DCR current sensing methods. The SENSE+ and SENSE– pins accept differential voltage signals from either discrete sense resistors or inductor DCR networks, with input bias currents specified at ±1µA (Page 4 Electrical Characteristics) - enabling flexible, low-loss current monitoring in high-current applications.
LTC7803JMSE#WTRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TFSOP (0.118", 3.00mm Width) 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):
- 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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7803JMSE#WTRPBF FAQ
1.How can I place an order for LTC7803JMSE#WTRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803JMSE#WTRPBF 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 LTC7803JMSE#WTRPBF reliable?
The price and inventory of LTC7803JMSE#WTRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803JMSE#WTRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803JMSE#WTRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803JMSE#WTRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803JMSE#WTRPBF?
LTC7803JMSE#WTRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803JMSE#WTRPBF 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 LTC7803JMSE#WTRPBF?
For technical support, including LTC7803JMSE#WTRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803JMSE#WTRPBF requirements.
6.How does Aetrix verify that LTC7803JMSE#WTRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803JMSE#WTRPBF 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 LTC7803JMSE#WTRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803JMSE#WTRPBF?
All LTC7803JMSE#WTRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803JMSE#WTRPBF, 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 LTC7803JMSE#WTRPBF part is unused and in its original packaging.
Return procedure for LTC7803JMSE#WTRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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