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Analog Devices Inc. LTC3824IMSE#PBF
- Part No.:
- LTC3824IMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3824IMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,657
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Product details
Overview
LTC3824IMSE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage, constant-frequency current-mode step-down DC/DC controller designed to drive external P-channel MOSFETs. It operates from 4V to 60V input, delivers up to 2A output in typical 5V/2A buck configurations, features 40µA quiescent current in Burst Mode, and supports programmable switching frequency up to 600kHz for industrial power supplies.
For engineers reviewing the LTC3824IMSE#PBF datasheet, LTC3824IMSE#PBF pinout, LTC3824IMSE#PBF application, or LTC3824IMSE#PBF equivalent, key selection criteria include its 10-lead MSE package thermal performance, 8V gate drive capability for high-voltage P-MOSFETs, 100% duty cycle operation, programmable current limit via sense resistor, and synchronization compatibility with external clock sources.
Technical Context
The LTC3824IMSE#PBF implements a transconductance error amplifier (gm = 220–370 µmho) regulating output voltage via VFB feedback against a precision 0.788–0.816V reference, while its current-mode PWM loop uses VC as the control signal with 0.7V turn-on threshold and 25mV shutdown trigger. The internal oscillator sets frequency via RSET (200–600kHz), with foldback to 50kHz when VFB drops below 0.5V during short-circuit events.
Burst Mode operation-enabled by leaving SYNC/MODE open or pulling >2V-reduces quiescent current to 40µA by cycling between active bursts and sleep states governed by VC thresholds (~0.07V wake-up, ~0.9V sleep entry). Gate drive delivers ±2.5A peak into 10nF load with clamped 8V high-side bias (VCC > 9V) and low-side sink down to 0.05V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive load-dump transients and wide industrial rails without external regulators. |
| Quiescent Current (Burst Mode) | 40µA typical - enables multi-day battery runtime in always-on systems like telematics or remote sensors. |
| Switching Frequency Range | 200kHz to 600kHz - adjustable via RSET resistor; allows EMI optimization and inductor size trade-offs. |
| Gate Drive Capability | ±2.5A peak, 8V clamp (VCC > 9V) - drives high-threshold P-MOSFETs (e.g., Si7465DP) with fast edge rates and low shoot-through risk. |
| Current Limit Threshold | 75–120mV across VCC–SENSE - sets overcurrent protection at IOUT(MAX) = 100mV/RS, enabling precise 3.3A limit with 0.03Ω sense resistor. |
| Reference Voltage Accuracy | ±1.5% over –40°C to 125°C - ensures stable 5V or 12V output regulation across full industrial temperature range. |
| Duty Cycle Range | 0% to 100% - supports ultra-low dropout operation (e.g., 5.5V→5V) and high-input-ratio conversion (60V→5V). |
Pinout & Package
The LTC3824IMSE#PBF is housed in a thermally enhanced 10-lead plastic MSOP (MSE) package with exposed pad (Pin 11) that must be soldered to PCB ground for θJA = 43°C/W thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1, Exposed Pad Pin 11) | Power and signal ground reference | Exposed pad is electrically GND and mandatory for thermal dissipation; requires large copper pour and multiple vias. |
| SYNC/MODE (Pin 2) | Mode control and sync input | Open or >2V enables Burst Mode; grounded or >20kHz sync pulse disables Burst Mode and forces pulse-skipping. |
| RSET (Pin 3) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 392kΩ → 200kHz); internal 1.2V reference enables accurate setting. |
| VC (Pin 4) | Error amplifier output / PWM control | 0.7V threshold starts switching; <25mV triggers micropower shutdown (7µA); VC voltage directly modulates inductor current. |
| VFB (Pin 5) | Inverting input of voltage error amplifier | Regulates output via resistor divider; 0.8V nominal reference; <0.5V triggers 50kHz foldback for short-circuit protection. |
| SS (Pin 6) | Soft-start timing node | Capacitor to GND controls ramp rate; tSS ≈ (C × 0.8V)/5µA; resistor to GND resets capacitor during shutdown. |
| SENSE (Pin 7) | Current sense amplifier input | Measures voltage drop across external sense resistor (RS); VCC–VSENSE threshold determines current limit. |
| VCC (Pin 8) | IC power supply input | 4V–60V operation; requires local bypass capacitor; powers internal regulator for gate driver bias (CAP pin). |
| GATE (Pin 9) | High-side P-MOSFET gate driver output | Delivers ±2.5A peak; clamped to 8V below VCC when VCC > 9V; low-side sink down to 0.05V minimizes conduction loss. |
| CAP (Pin 10) | Internal regulator bypass | Requires ≥0.1µF low-ESR capacitor to VCC; stabilizes gate driver bias rail and reduces noise coupling into control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 40µA in Burst Mode extends battery life in always-on automotive and IoT applications without compromising startup time. |
| 100% duty cycle operation | Enables minimum dropout regulation (e.g., 5.5V input → 5V output), critical for post-regulator stages in multi-rail systems. |
| Programmable current limit | Set via external sense resistor (RS); 75–120mV threshold allows precise overcurrent protection matching MOSFET SOA. |
| Integrated gate driver with 8V clamp | Drives high-VGS(th) P-MOSFETs reliably without external level shifters, reducing BOM count and layout complexity. |
| Synchronization capability | Accepts external clock up to 600kHz with 10–70% duty cycle; enables phase interleaving and EMI reduction in multi-converter systems. |
Applications
| Automotive Infotainment Power Supply | Industrial PLC I/O Module |
|---|---|
Use Scenario: 12V vehicle battery powers 5V/2A rail for display controllers and audio codecs under load-dump (60V) and cold-crank (4V) conditions. IC Role / Device Role / Timing Role: Primary step-down controller managing P-MOSFET switch, current sensing, and output regulation with Burst Mode for standby efficiency. Use Value: 40µA quiescent current prevents battery drain during vehicle off-state; 60V absolute max rating withstands ISO 7637-2 pulses without protection circuitry. | Use Scenario: Distributed 24V DC bus powers isolated 12V/2A outputs for analog sensor interfaces and digital I/O in factory automation cabinets. IC Role / Device Role / Timing Role: High-efficiency buck controller delivering stable 12V with tight regulation across –40°C to 125°C ambient. Use Value: 0.788–0.816V reference accuracy and 125°C-rated junction temperature ensure long-term stability in uncooled enclosures. |
| Telecom Remote Radio Unit (RRU) | Distributed Power System DC-DC Brick |
Use Scenario: 48V telecom rectifier feeds 5V/2A intermediate bus for FPGA and RF front-end ICs in outdoor base stations. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller synchronizing to system clock to minimize conducted EMI in sensitive RF environments. Use Value: Synchronization input accepts 230–600kHz external clocks; foldback to 50kHz during faults prevents inductor saturation during short circuits. | Use Scenario: Modular 60V input brick provides 12V/2A output to downstream point-of-load converters in data center power shelves. IC Role / Device Role / Timing Role: High-voltage primary controller enabling compact, thermally efficient design with minimal external components. Use Value: Exposed-pad MSE package achieves θJA = 43°C/W; 8V gate drive reduces MOSFET conduction losses versus discrete driver solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3838EMSE#PBF | Wider 2.5V–60V input range; dual-output capability; higher 1MHz max frequency; no Burst Mode (1.3mA IQ) | Preferred for dual-rail systems or where higher frequency enables smaller magnetics; unsuitable for ultra-low-power battery backup. | Select LTC3838EMSE#PBF when needing dual outputs or >600kHz operation; avoid if 40µA IQ is required. |
| LM5116MH/NOPB | 4.5V–100V input; N-MOSFET driver; 50µA shutdown IQ; no Burst Mode; 500kHz max frequency | Supports higher input voltages and N-MOSFETs (lower RDS(on)), but lacks Burst Mode efficiency and P-MOSFET simplicity for high-side switch. | Select LM5116MH/NOPB for >60V inputs or N-MOSFET cost/performance trade-offs; retain LTC3824IMSE#PBF for P-MOSFET simplicity and lowest IQ. |
Compared with LTC3838EMSE#PBF and LM5116MH/NOPB, the LTC3824IMSE#PBF uniquely balances ultra-low 40µA Burst Mode IQ, P-MOSFET integration, and 60V operation-making it optimal for space-constrained, battery-sensitive industrial and automotive buck designs where single-output simplicity is prioritized.
Availability
LTC3824IMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment power supplies, industrial PLC I/O modules, and telecom remote radio units requiring stable component supply across extended temperature ranges and high-reliability manufacturing.
Supply support for LTC3824IMSE#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 acquired Linear Technology in 2017 and maintains its legacy of high-performance power management ICs with rigorous automotive and industrial qualification.
The LTC3824IMSE#PBF belongs to Linear's high-voltage buck controller product line, engineered specifically for robust, efficient DC/DC conversion in harsh environments including automotive, industrial, and telecom infrastructure.
FAQ
What is the maximum input voltage rating for the LTC3824IMSE#PBF?
The LTC3824IMSE#PBF has an absolute maximum input voltage rating of 65V on the VCC pin and is specified for continuous operation from 4V to 60V. This makes it suitable for automotive applications subject to load-dump transients up to 60V, as confirmed in the Absolute Maximum Ratings table and Typical Application schematics.
Does the LTC3824IMSE#PBF support synchronization to an external clock?
Yes, the LTC3824IMSE#PBF supports synchronization via the SYNC/MODE pin (Pin 2). It accepts external clock signals from 230kHz to 600kHz (depending on RSET value), with a rising-edge threshold of 1.3V and compatible duty cycle range of 10% to 70%, as documented in the Electrical Characteristics and Pin Functions sections.
How does Burst Mode operation reduce quiescent current in the LTC3824IMSE#PBF?
Burst Mode operation in the LTC3824IMSE#PBF reduces quiescent current to 40µA by cycling between active switching bursts and deep-sleep states. When load drops, VC falls to ~0.07V to wake the controller, then rises to ~0.9V to re-enter sleep-minimizing average supply current while maintaining regulation, as detailed in the Applications Information section.
What is the purpose of the CAP pin (Pin 10) on the LTC3824IMSE#PBF?
Pin 10 (CAP) on the LTC3824IMSE#PBF is the bypass terminal for the internal gate driver regulator. A minimum 0.1µF low-ESR capacitor must connect CAP to VCC to stabilize the 8V bias rail, suppress switching noise coupling, and ensure clean gate drive waveforms-critical for reliable P-MOSFET turn-on/turn-off, per the Pin Functions description.
Can the LTC3824IMSE#PBF drive N-channel MOSFETs?
No, the LTC3824IMSE#PBF is specifically designed to drive external P-channel MOSFETs using its high-side gate driver architecture. Its GATE pin delivers voltage relative to VCC (clamped to 8V below VCC), which is incompatible with N-MOSFET high-side drive requirements. The datasheet explicitly states "designed to drive an external P-channel MOSFET" in the Description section.
LTC3824IMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (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):
- 4V ~ 60V
- Frequency - Switching:
- 200kHz ~ 600kHz
- Duty Cycle (Max):
- 100%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3824IMSE#PBF FAQ
1.How can I place an order for LTC3824IMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3824IMSE#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 LTC3824IMSE#PBF reliable?
The price and inventory of LTC3824IMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3824IMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3824IMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3824IMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3824IMSE#PBF?
LTC3824IMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3824IMSE#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 LTC3824IMSE#PBF?
For technical support, including LTC3824IMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3824IMSE#PBF requirements.
6.How does Aetrix verify that LTC3824IMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3824IMSE#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 LTC3824IMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3824IMSE#PBF?
All LTC3824IMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3824IMSE#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 LTC3824IMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3824IMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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