My Inquiry
My Account
Analog Devices Inc. LTC7803HMSE#PBF
- Part No.:
- LTC7803HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC7803HMSE#PBF.pdf
- Description:
- LOW IQ SYNCHRONOUS BUCK CONTROLL
- Quantity:
- Payment:
- Shipping:
Inventory:180
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC7803HMSE#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 LTC7803HMSE#PBF datasheet, LTC7803HMSE#PBF pinout, LTC7803HMSE#PBF application, or LTC7803HMSE#PBF equivalent, key selection factors include its 3MHz programmable switching frequency, RSENSE/DCR current sensing flexibility, OPTI-LOOP compensation, PassThru™ capability, and AEC-Q100 qualification for under-hood automotive systems.
Technical Context
The LTC7803HMSE#PBF implements a constant-frequency peak current mode control architecture with phase-lockable oscillator (100kHz–3MHz), enabling precise timing synchronization and jitter-controlled switching. Its dual-mode gate drivers (TG/BG) support high-side and low-side N-MOSFETs with 1.5Ω pull-down and 3Ω pull-up on-resistance, and integrated charge pump enables true 100% duty cycle operation during dropout.
It features three selectable light-load operating modes - Burst Mode (12µA IQ), pulse-skipping, or forced continuous conduction - controlled via the MODE pin, while spread spectrum dithering on PLLIN/SPREAD reduces conducted/EMI peaks without external components. The OPTI-LOOP compensation architecture adapts transient response 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 transients and industrial 24V/36V rails. |
| No-Load Quiescent Current | 12µA at 14VIN→3.3VOUT - extends runtime in always-on vehicle modules (e.g., telematics, ADAS sensors). |
| Switching Frequency | Programmable 100kHz–3MHz (via FREQ pin resistor) - enables compact magnetics and avoids AM band interference. |
| Feedback Reference Voltage | 0.792V–0.808V (±1.5%) - ensures tight output regulation across temperature and load for precision 3.3V/5V/12V rails. |
| Current Sense Threshold | 50mV typical (45–55mV) - allows accurate current limiting with low-value, low-power sense resistors (e.g., 1mΩ). |
| Operating Junction Temp | –40°C to +150°C - qualified for under-hood automotive environments per AEC-Q100 Grade H. |
| Shutdown Current | 1.2µA - enables ultra-low-power system-level sleep states without auxiliary regulators. |
Pinout & Package
Package: 16-lead plastic MSOP (3mm × 4.9mm), thermally enhanced with exposed GND pad (Pin 17) requiring PCB soldering for thermal performance (θJA = 40°C/W). Pin count and layout match industry-standard MSOP footprint.
| 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 | Supports RSENSE or DCR sensing; SENSE– ≥3.2V supplies sleep-mode current, reducing VIN-referred IQ. |
| VFB (Pin 4) | Error amplifier feedback input | Regulates output to 0.8V reference; connects to resistor divider for adjustable VOUT (0.8V–40V). |
| ITH (Pin 5) | Error amplifier output & compensation node | Controls peak inductor current; external RC network sets loop stability and transient response. |
| RUN (Pin 6) | Enable/shutdown control | 1.2V threshold enables operation; <0.7V forces shutdown (1.2µA IQ); supports UVLO implementation. |
| FREQ (Pin 7) | VCO frequency programming | GND = 375kHz, INTVCC = 2.25MHz; resistor-to-GND sets 100kHz–3MHz - no external clock required. |
| PLLIN/SPREAD (Pin 8) | Synchronization & spread spectrum select | INTVCC = enable spread spectrum; external clock = phase-lock mode; GND = disable dithering. |
| MODE (Pin 9) | Light-load operation mode select | GND = Burst Mode; INTVCC = forced continuous; 100k-to-INTVCC = pulse-skipping. |
| INTVCC (Pin 10) | Internal 5.15V LDO output | Powers gate drivers and logic; requires ≥4.7µF ceramic decoupling; switchover to EXTVCC at 4.7V. |
| EXTVCC (Pin 11) | External bias input for INTVCC LDO | Enables high-efficiency local supply (e.g., post-regulator rail); bypasses VIN LDO when >4.7V. |
| VIN (Pin 12) | Main input supply | Bias source for internal circuits when EXTVCC not used; requires local ceramic bypass capacitor. |
| BG (Pin 13) | Bottom gate driver output | Drives synchronous N-MOSFET source-to-GND; swing = 0V to INTVCC (5.15V). |
| BOOST (Pin 14) | Bootstrap supply for top driver | Connects to SW via capacitor; Schottky diode to INTVCC enables 100% duty cycle in dropout. |
| TG (Pin 15) | Top gate driver output | Floating driver output; voltage = SW + INTVCC; drives high-side N-MOSFET gate. |
| SW (Pin 16) | Switch node connection | Connects to inductor and BOOST capacitor; high dv/dt node requiring careful layout and ground isolation. |
| GND (Pin 17) | Power & signal ground | Exposed thermal pad - must be soldered to PCB plane for thermal integrity and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Spread Spectrum Operation | Reduces peak EMI by ±10% frequency dithering - eliminates need for external EMI filters in automotive EMC-critical designs. |
| PassThru™ / 100% Duty Cycle | Integrated charge pump sustains top-FET drive during VIN ≈ VOUT dropout - maintains regulation in cold-crank scenarios (e.g., 6V start). |
| OPTI-LOOP Compensation | Adapts error amplifier transconductance to output cap ESR and capacitance - simplifies loop tuning across diverse output filter designs. |
| AEC-Q100 Qualified (Grade H) | Validated for –40°C to +150°C junction operation - meets automotive reliability requirements without derating for under-hood placement. |
| Selectably Low-IQ Light-Load Modes | Burst Mode (12µA), pulse-skipping, or forced CCM - enables optimal efficiency trade-off across full load range (100µA–20A). |
Applications
| Automotive Infotainment Power Supply | Industrial 24V-to-12V/5V Conversion |
|---|---|
Use Scenario: Powering head unit SoCs, display drivers, and audio amplifiers from vehicle battery (9–16V nominal, 4–40V transients). IC Role / Device Role: Primary synchronous buck controller regulating stable 5V/3.3V rails with fast transient response to burst loads. Use Value: 12µA quiescent current prevents battery drain during ignition-off; spread spectrum meets CISPR 25 Class 5 radiated emissions limits. |
Use Scenario: Converting unregulated 24V factory bus to isolated 12V/5V for PLC I/O modules and sensor interfaces. IC Role / Device Role: High-input-voltage step-down controller driving discrete N-MOSFETs for robust, field-serviceable power stages. Use Value: 40V max input withstands 36V surges; 150°C junction rating ensures reliability in enclosed cabinets without forced air cooling. |
| Military Vehicle DC-DC Distribution | Telecom Remote Radio Unit (RRU) |
Use Scenario: Generating 3.3V/12V from 28V aircraft or armored vehicle power buses subject to MIL-STD-1275E transients. IC Role / Device Role: Radiation-tolerant (by design), high-temp controller managing high-current buck stages in mission-critical avionics. Use Value: AEC-Q100 Grade H qualification correlates with extended reliability; 100% duty cycle maintains output during 12V brownouts. |
Use Scenario: Efficiently stepping down -48V telecom rectifier output to 12V/5V for FPGA, RF front-end, and baseband ICs in outdoor RRUs. IC Role / Device Role: High-frequency (2.25MHz) controller enabling small inductors and capacitors in space-constrained outdoor enclosures. Use Value: 3MHz capability shrinks passive size by >50% vs 500kHz solutions; low IQ extends backup battery life during grid outages. |
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 |
|---|---|---|---|
| LTC7801IMSE#PBF | Lower max input (38V), no spread spectrum, 125°C max junction temp, fixed 500kHz/1MHz freq options only. | Not AEC-Q100 qualified; unsuitable for automotive under-hood use or stringent EMI environments. | Choose for cost-sensitive industrial designs where EMI filtering is acceptable and ambient temp stays <125°C. |
| MP2918GL-Z | Monolithic 3A buck (not controller); 18V max input; no 100% duty cycle; no spread spectrum; 125°C max junction. | Integrates MOSFETs - limited to lower current; cannot scale to 20A+ like LTC7803HMSE#PBF with external FETs. | Choose only for low-power, space-constrained applications where integrated solution suffices and input <18V. |
Compared with LTC7801IMSE#PBF and MP2918GL-Z, the LTC7803HMSE#PBF uniquely combines AEC-Q100 Grade H qualification, spread spectrum EMI reduction, true 100% duty cycle, and 150°C operation - making it the only viable choice for high-reliability, high-temperature, low-noise automotive and military power conversion.
Availability
LTC7803HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment, industrial 24V power distribution, and military vehicle DC-DC conversion requiring stable component supply, long-term lifecycle assurance, and AEC-Q100 compliance.
Supply support for LTC7803HMSE#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 automotive, industrial, communications, and defense markets since 1965.
The LTC7803HMSE#PBF belongs to Analog Devices' Power by Linear™ controller family, designed specifically for high-efficiency, high-reliability DC/DC conversion in harsh environments - emphasizing low IQ, wide VIN, EMI mitigation, and automotive-grade robustness.
FAQ
What is the maximum input voltage rating for the LTC7803HMSE#PBF?
The LTC7803HMSE#PBF has an absolute maximum input supply voltage (VIN) of 40V, with guaranteed operation from 4.5V to 40V. This makes it suitable for automotive battery systems experiencing load dump transients up to 40V, as well as industrial 24V/36V rails. Exceeding 40V risks permanent damage per Absolute Maximum Ratings.
Does the LTC7803HMSE#PBF support 100% duty cycle operation, and how is it implemented?
Yes, the LTC7803HMSE#PBF supports true 100% duty cycle operation via an integrated charge pump that sustains gate drive for the top N-MOSFET when VIN approaches VOUT - critical for cold-crank scenarios in automotive applications. This PassThru™ feature is enabled automatically during dropout without external circuitry or configuration.
How does spread spectrum operation reduce EMI in the LTC7803HMSE#PBF?
The LTC7803HMSE#PBF reduces peak conducted and radiated EMI by dithering its switching frequency ±10% around the programmed center frequency when PLLIN/SPREAD is tied to INTVCC. This spreads energy across a wider bandwidth, lowering spectral peaks - helping designs meet CISPR 25 Class 5 and FCC Part 15 limits without added ferrites or shielding.
What is the purpose of the SENSE– pin's current-sourcing behavior above 3.2V in the LTC7803HMSE#PBF?
When SENSE– voltage exceeds 3.2V, the LTC7803HMSE#PBF sources most of its sleep-mode quiescent current from SENSE– instead of VIN. This reduces the input-referred IQ by the factor (VIN/VOUT) × efficiency - e.g., at 12VIN/3.3VOUT, effective IQ drops from 14µA to ~3.8µA, significantly extending battery life in always-on automotive modules.
Is the LTC7803HMSE#PBF pin-compatible with other variants in the LTC7803 family?
Yes, the LTC7803HMSE#PBF shares identical pinout, package (16-lead MSOP), and electrical interface with all other LTC7803 variants (e.g., LTC7803EMSE#PBF, LTC7803JMSE#PBF). Only the operating temperature grade differs: LTC7803HMSE#PBF is rated for –40°C to +150°C junction temperature, matching AEC-Q100 Grade H requirements.
LTC7803HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LTC7803HMSE#PBF FAQ
1.How can I place an order for LTC7803HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC7803HMSE#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 LTC7803HMSE#PBF reliable?
The price and inventory of LTC7803HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC7803HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC7803HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC7803HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC7803HMSE#PBF?
LTC7803HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC7803HMSE#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 LTC7803HMSE#PBF?
For technical support, including LTC7803HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC7803HMSE#PBF requirements.
6.How does Aetrix verify that LTC7803HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC7803HMSE#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 LTC7803HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC7803HMSE#PBF?
All LTC7803HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC7803HMSE#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 LTC7803HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC7803HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC7803HMSE#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…
