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Analog Devices Inc. LTC7803IMSE#TRPBF
- Part No.:
- LTC7803IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803IMSE#TRPBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
LTC7803IMSE#TRPBF 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, and achieves 12µA no-load quiescent current - enabling extended battery runtime in automotive and industrial power systems.
For engineers reviewing the LTC7803IMSE#TRPBF datasheet, LTC7803IMSE#TRPBF pinout, LTC7803IMSE#TRPBF application, or LTC7803IMSE#TRPBF equivalent, key selection criteria include spread spectrum EMI reduction, OPTI-LOOP compensation for wide output capacitor/ESR tolerance, and selectable light-load modes (Burst, pulse-skipping, or forced continuous) with phase-lockable 100kHz–3MHz switching frequency.
Technical Context
The LTC7803IMSE#TRPBF implements a constant-frequency peak current mode control architecture with dual gate drivers (TG/BG) supporting 100% duty cycle via integrated charge pump. Its error amplifier (EA) regulates VFB to 0.792–0.808V with ±50nA feedback current and transconductance gm = 2mmho.
It features RSENSE or DCR current sensing, programmable frequency via FREQ pin (100kHz–3MHz), and spread spectrum dithering when PLLIN/SPREAD = INTVCC - reducing peak conducted/radiated noise without external filters. The MODE pin selects among Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction at light loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V - supports wide-input industrial, automotive, and telecom power rails without pre-regulation. |
| No-Load Quiescent Current | 12µA at 14VIN → 3.3VOUT - extends battery life in always-on vehicle modules and remote sensors. |
| Feedback Reference Voltage | 0.792V to 0.808V (±1.2%) - enables precise output regulation across temperature and load with minimal external resistor tolerance impact. |
| Switching Frequency Range | 100kHz to 3MHz (programmable or phase-lockable) - allows optimization of size (high-freq) vs. efficiency (low-freq) and EMI compliance via synchronization. |
| Current Sense Threshold | 45mV to 55mV - supports low-loss, high-accuracy RSENSE or DCR sensing with minimal voltage drop penalty. |
| Shutdown Current | 1.2µA - ensures ultra-low leakage during system sleep states, critical for automotive infotainment standby. |
| Package | 16-pin MSOP (3mm × 3mm) with exposed GND pad - provides thermal resistance θJA = 40°C/W for high-power density designs. |
Pinout & Package
Package: 16-lead plastic MSOP (MSE), thermally enhanced with exposed GND pad (Pin 17) requiring PCB soldering 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 via resistor divider. |
| SENSE+ / SENSE− (Pins 2,3) | Differential current sense inputs | Supports RSENSE or DCR sensing; SENSE− ≥ 3.2V supplies sleep-mode current to reduce VIN-referred IQ. |
| VFB (Pin 4) | Error amplifier feedback node | Regulated to 0.8V reference; connects to resistor divider for output voltage setting with ±50nA input bias. |
| ITH (Pin 5) | Error amplifier output & compensation point | Controls peak inductor current; compensation components placed between ITH and GND for OPTI-LOOP tuning. |
| RUN (Pin 6) | Enable/shutdown control | 1.15–1.25V rising threshold; <0.7V forces shutdown (1.2µA IQ); supports UVLO implementation with external divider. |
| FREQ (Pin 7) | Frequency programming input | GND = 375kHz, INTVCC = 2.25MHz; resistor-to-GND sets 100kHz–3MHz - enables EMI optimization and layout flexibility. |
| PLLIN/SPREAD (Pin 8) | Synchronization & spread spectrum select | External clock input for phase-locking; INTVCC enables spread spectrum dithering to lower peak EMI emissions. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode (12µA IQ), INTVCC = forced continuous, 100kΩ-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; switchover to EXTVCC at 4.7V reduces VIN loading. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Accepts 4.6–4.8V switchover voltage; bypasses VIN LDO to improve efficiency when powered from intermediate rail. |
| VIN (Pin 12) | Main input supply | Bias source for internal circuits when EXTVCC is inactive; requires local ceramic bypass capacitor. |
| BG (Pin 13) | Bottom N-MOSFET gate driver | Drives synchronous rectifier with 1.5Ω pull-down / 3Ω pull-up; swing from GND to INTVCC. |
| BOOST (Pin 14) | Bootstrap supply for top driver | Connects to SW via capacitor and to INTVCC via Schottky diode; internal charge pump enables 100% duty cycle in dropout. |
| TG (Pin 15) | Top N-MOSFET gate driver | Floating driver output; voltage swing = INTVCC superimposed on SW node - enables high-side N-FET drive. |
| SW (Pin 16) | Switch node connection | Connects to inductor and BOOST capacitor; high dv/dt node requiring careful layout and ground separation. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad; must be soldered to PCB plane for thermal integrity and low-noise small-signal referencing. |
Key Features
| Feature | Design Value |
|---|---|
| Spread spectrum operation | Reduces peak radiated/conducted EMI by spreading oscillator energy across ±20% bandwidth - simplifies FCC/CE compliance without added filtering. |
| OPTI-LOOP compensation | Enables stable loop response across wide range of output capacitance (e.g., 10µF–470µF) and ESR values - eliminates need for custom compensation per capacitor type. |
| 100% duty cycle capability | Integrated charge pump maintains TG drive during VIN-to-VOUT dropout - supports PassThru™ operation in automotive cold-crank (4.5V) to 3.3V/5V rails. |
| AEC-Q100 qualified | Rated for –40°C to +125°C junction temperature (I-grade) - validated for automotive engine control, ADAS, and infotainment power supplies. |
| Selectably optimized light-load efficiency | Burst Mode (12µA IQ), pulse-skipping, or forced continuous modes - preserves >85% efficiency down to 1mA load while controlling output ripple per application need. |
Applications
| Automotive Power Management | Industrial DC Power Distribution |
|---|---|
|
Use Scenario: 12V/24V battery-fed ECU supplying 3.3V/5V to microcontrollers and CAN transceivers under cold-crank (4.5V) and load-dump conditions. IC Role / Device Role / Timing Role: Primary synchronous step-down controller regulating stable low-voltage rails with 100% duty cycle support and AEC-Q100 reliability. Use Value: 12µA quiescent current prevents battery drain during vehicle sleep; spread spectrum meets CISPR 25 Class 5 EMI limits without shielding. |
Use Scenario: Wide-input 18–40V factory automation rail powering 3.3V FPGA I/O banks and 5V sensor interfaces with high transient immunity. IC Role / Device Role / Timing Role: High-efficiency, phase-lockable controller synchronizing to system clock to avoid beat frequencies in multi-rail power trees. Use Value: Programmable 100kHz–3MHz frequency enables optimal inductor sizing; OPTI-LOOP tolerates aging electrolytic output capacitors. |
| Military Avionics Power | Telecom Base Station Bias |
|
Use Scenario: Ruggedized airborne computer requiring MIL-STD-704 compliant 28V input conversion to 1.2V/1.8V core voltages with EMI resilience. IC Role / Device Role / Timing Role: Radiation-tolerant (by design) controller with low-noise spread spectrum and robust UVLO/thermal protection. Use Value: 1.2µA shutdown current meets stringent standby power budgets; 150°C H-grade variants available for high-temperature chassis mounting. |
Use Scenario: 48V telecom rectifier output stepped down to 12V for RF amplifier bias, requiring low EMI in dense RF module layouts. IC Role / Device Role / Timing Role: Synchronous buck controller with PLLIN synchronization to baseband clock to suppress switching noise in adjacent receivers. Use Value: Phase-lockable 3MHz operation avoids interference bands; 45–55mV current sense threshold enables precision current limiting for PA protection. |
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, QFN-16 package only | Lacks programmable frequency and EMI reduction features; limited to cost-sensitive non-automotive applications | Choose MP2918GQ-Z only if fixed frequency and lower BOM cost outweigh EMI and light-load efficiency requirements. |
| LM5115MMX/NOPB | 4.5–100V input, 100µA IQ, no spread spectrum, SOIC-14 package, no 100% duty cycle | Wider input range but higher quiescent current; unsuitable for battery-backed automotive modules needing <20µA sleep IQ | LM5115MMX/NOPB fits high-input industrial systems where dropout operation is not required and EMI is managed externally. |
Compared with LTC7803IMSE#TRPBF, MP2918GQ-Z offers lower cost but sacrifices programmable frequency and EMI suppression, while LM5115MMX/NOPB supports higher input voltage but doubles quiescent current and lacks 100% duty cycle - making LTC7803IMSE#TRPBF optimal for automotive and EMI-sensitive industrial designs.
Availability
LTC7803IMSE#TRPBF is available at Aetrix Electronics and suitable for automotive power management, industrial DC distribution, military avionics, and telecom base station bias applications requiring stable component supply, AEC-Q100 qualification, and low EMI profile.
Supply support for LTC7803IMSE#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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and defense markets.
The LTC7803 belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, low-EMI, wide-input synchronous buck regulation in safety-critical and space-constrained applications.
FAQ
What is the operating temperature range for the LTC7803IMSE#TRPBF?
The LTC7803IMSE#TRPBF is rated for an operating junction temperature range of –40°C to +125°C, meeting AEC-Q100 Grade I requirements. This makes it suitable for under-hood automotive applications and industrial environments where ambient temperatures exceed 85°C. Thermal derating applies above 125°C junction temperature per datasheet Note 2.
Does the LTC7803IMSE#TRPBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803IMSE#TRPBF supports true 100% duty cycle operation via an integrated charge pump that sustains TG gate drive during VIN-to-VOUT dropout. This enables PassThru™ functionality - critical for automotive cold-crank scenarios where input may dip to 4.5V while maintaining regulated 3.3V/5V outputs without external circuitry.
How does spread spectrum operation reduce EMI in the LTC7803IMSE#TRPBF?
The LTC7803IMSE#TRPBF reduces peak conducted and radiated EMI by dithering its oscillator frequency ±20% around the nominal value when PLLIN/SPREAD is tied to INTVCC. This spreads switching energy across a wider bandwidth, lowering spectral peaks by up to 10dB - easing compliance with CISPR 25 and EN 55022 without adding ferrite beads or shielded inductors.
Can the LTC7803IMSE#TRPBF be synchronized to an external clock, and what is the supported frequency range?
Yes, the LTC7803IMSE#TRPBF supports external synchronization via the PLLIN/SPREAD pin, accepting clock signals from 100kHz to 3MHz. When an external clock 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-rail systems and eliminating beat frequencies in dense PCB layouts.
What are the key differences between Burst Mode, pulse-skipping, and forced continuous operation in the LTC7803IMSE#TRPBF?
The LTC7803IMSE#TRPBF offers three light-load modes via the MODE pin: Burst Mode (12µA IQ, lowest power, higher output ripple), pulse-skipping (moderate IQ ~28µA, controlled ripple), and forced continuous (highest IQ ~2mA, lowest ripple, best transient response). Selection depends on system trade-offs between standby power, output voltage stability, and EMI profile.
LTC7803IMSE#TRPBF 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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7803IMSE#TRPBF FAQ
1.How can I place an order for LTC7803IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803IMSE#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 LTC7803IMSE#TRPBF reliable?
The price and inventory of LTC7803IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC7803IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803IMSE#TRPBF?
LTC7803IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803IMSE#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 LTC7803IMSE#TRPBF?
For technical support, including LTC7803IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC7803IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC7803IMSE#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 LTC7803IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC7803IMSE#TRPBF?
All LTC7803IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803IMSE#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 LTC7803IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC7803IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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