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Analog Devices Inc. LTC3824MPMSE#PBF
- Part No.:
- LTC3824MPMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3824MPMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
LTC3824MPMSE#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 in industrial and automotive power supplies. It operates from 4V to 60V input, delivers up to 2A output with programmable 200–600kHz switching frequency, supports Burst Mode operation with 40µA quiescent current, and features 100% duty cycle capability for ultra-low dropout regulation.
For engineers reviewing the LTC3824MPMSE#PBF datasheet, LTC3824MPMSE#PBF pinout, LTC3824MPMSE#PBF application, or LTC3824MPMSE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed operating temperature range (–55°C to 150°C), real-world efficiency data at 12V/40V input, and precise alternative selection guidance for high-reliability power designs.
Technical Context
The LTC3824MPMSE#PBF implements a transconductance error amplifier (gm = 220–370 µmho) controlling a current-mode PWM loop with fixed-frequency operation and programmable oscillator via RSET. Its gate driver delivers 2.5A peak source/sink into 10nF load with 8V clamped high-side drive (VCC > 9V) and supports synchronous pulse widths from 10% to 70% duty cycle.
Burst Mode is enabled by leaving SYNC/MODE open or pulling >2V, triggering sleep cycles when VC drops to ~0.9V and resuming at ~70mV - reducing quiescent current to 40µA. Under short-circuit conditions (VFB < 0.5V), it folds back switching frequency to 50kHz to limit inductor current runaway while maintaining regulation integrity.
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 pre-regulation. |
| Quiescent Current (Burst Mode) | 40µA typical - enables multi-day battery runtime in always-on systems like telematics or sensor nodes. |
| Switching Frequency Range | 200kHz to 600kHz - balances EMI control, inductor size, and efficiency across 12V/40V input conditions. |
| Current Limit Threshold | 75–120mV (VCC–VSENSE) - sets overcurrent protection point with ±25mV tolerance, enabling precise 3.3A max output with 0.025Ω sense resistor. |
| Reference Voltage (VREF) | 0.788V to 0.816V - tight 0.8V nominal feedback threshold ensures ±1.5% output voltage accuracy over full temperature range. |
| Operating Junction Temp | –55°C to 150°C - fully tested and guaranteed for under-hood automotive and harsh-environment industrial use. |
| Gate Drive Capability | 8V clamp (VCC > 9V), 2.5A peak - drives high-threshold P-MOSFETs (e.g., Si7465DP) with fast turn-on/turn-off and low shoot-through risk. |
Pinout & Package
Package: 10-lead plastic MSOP (MSE) with exposed pad (Pin 11 = GND), thermally enhanced for θJC = 3°C/W and θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for rated thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 11) | Power and signal reference ground | Pin 11 is exposed thermal pad - mandatory connection to PCB ground plane for thermal dissipation and noise immunity. |
| SYNC/MODE (Pin 2) | Burst Mode enable/disable & 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 frequency: 392kΩ = 200kHz, 200kΩ = 400kHz, 100kΩ = 600kHz per datasheet curves. |
| VC (Pin 4) | Error amplifier output & PWM control node | 0.7V threshold starts switching; <25mV triggers micropower shutdown; 0.84V threshold enters Burst Mode. |
| VFB (Pin 5) | Inverting input of voltage error amplifier | Regulates output to 0.8V reference; <0.5V triggers 50kHz foldback for short-circuit protection. |
| SS (Pin 6) | Soft-start timing capacitor node | Capacitor value sets ramp time: tSS = (C × 0.8V)/5µA; 0.1µF yields ~16ms soft-start. |
| SENSE (Pin 7) | High-side current sense input | Measures voltage drop across external sense resistor (RS); 100mV threshold sets current limit. |
| VCC (Pin 8) | IC power supply input | Accepts 4–60V; requires local bypass capacitor; powers internal regulator and gate driver bias circuitry. |
| GATE (Pin 9) | High-side P-MOSFET gate driver output | Delivers 2.5A peak current; clamped to 8V below VCC when VCC > 9V; optimized for fast P-FET turn-on. |
| CAP (Pin 10) | Internal regulator bypass capacitor | Requires ≥0.1µF low-ESR ceramic capacitor to VCC to stabilize gate driver bias voltage and reduce noise. |
Key Features
| Feature | Design Value |
|---|---|
| 100% Duty Cycle Operation | Enables ultra-low dropout regulation down to VOUT ≈ VIN – VDS(ON), critical for battery-powered systems near end-of-life voltage. |
| Programmable Soft-Start | External capacitor on SS pin controls output ramp rate, preventing inrush current and ensuring controlled startup into capacitive loads. |
| 8V Gate Driver Clamp | Protects P-MOSFET gate oxide while delivering sufficient VGS for low RDS(ON) conduction - eliminates need for external Zener clamp. |
| Current Limit with Kelvin Sensing | SENSE pin accepts remote sensing of RS voltage drop, rejecting PCB trace resistance errors for accurate overcurrent protection. |
| Micropower Shutdown | VC < 25mV reduces supply current to 7µA, enabling system-level power gating without external enable circuitry. |
Applications
| Automotive Telematics Power Supply | Industrial 24V-to-5V Conversion |
|---|---|
|
Use Scenario: Powering GPS, cellular modem, and CAN interface in vehicle black box units exposed to –40°C to +125°C ambient and 60V load-dump transients. IC Role / Device Role / Timing Role: Primary step-down controller regulating stable 5V rail from unregulated 6–60V battery bus using external P-MOSFET and Schottky catch diode. Use Value: 40µA Burst Mode quiescent current extends backup battery life; –55°C to 150°C guaranteed operation ensures reliability during engine-off storage and under-hood operation. |
Use Scenario: Generating 5V/2A for PLC I/O modules powered from 24V industrial bus with strict EMI limits and thermal constraints. IC Role / Device Role / Timing Role: Constant-frequency current-mode buck controller driving Si7465DP P-MOSFET at 400kHz to minimize filter size while meeting CISPR-22 Class B emissions. Use Value: Programmable RSET allows frequency tuning to avoid noise-sensitive bands; 8V gate clamp simplifies MOSFET selection and improves efficiency vs. discrete gate drivers. |
| Telecom Distributed Power | Harsh-Environment Sensor Node |
|
Use Scenario: Point-of-load conversion in telecom base station cards requiring 12V-to-3.3V/2A with high efficiency at light loads and robust transient response. IC Role / Device Role / Timing Role: High-voltage buck controller supporting 40V input transients and delivering tightly regulated 3.3V output with fast load-step recovery. Use Value: Burst Mode reduces no-load power loss to <100µW; 50kHz foldback during short-circuit prevents thermal runaway in densely packed boards. |
Use Scenario: Battery-powered environmental monitor deployed in oil/gas field equipment operating continuously at –40°C to +85°C with 10-year service life. IC Role / Device Role / Timing Role: Ultra-low-IQ step-down controller powering microcontroller, RF transceiver, and analog sensors from lithium-thionyl chloride primary cell. Use Value: 40µA quiescent current enables >5-year battery life; extended temperature grade eliminates derating concerns in unheated enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Integrated 75V N-MOSFET gate driver + dual output capability; higher 1.5mA no-load IQ; no Burst Mode. | Supports higher output currents (>10A) with external N-MOSFETs; better suited for multi-rail systems but less efficient at microamp-level standby. | Select when needing dual outputs or N-MOSFET drive; avoid if 40µA IQ or P-MOSFET simplicity is required. |
| LM5116MH/NOPB | 5–100V input; 100µA typical IQ in skip mode; integrated bootstrap diode; no programmable soft-start. | Optimized for high-current N-MOSFET designs; lacks Kelvin sense and precise current limit threshold of LTC3824MPMSE#PBF. | Prefer for cost-sensitive, high-power N-MOSFET applications where 40µA IQ and precision current limiting are non-critical. |
Compared with LTC3824MPMSE#PBF, LTC3891EMSE#PBF trades ultra-low quiescent current for dual-output flexibility and N-MOSFET drive, while LM5116MH/NOPB offers wider input range and lower BOM count at the expense of Burst Mode efficiency and current-sense accuracy - making LTC3824MPMSE#PBF optimal for P-MOSFET-based, battery-sensitive, single-rail industrial designs.
Availability
LTC3824MPMSE#PBF is available at Aetrix Electronics and suitable for automotive telematics, industrial PLC power supplies, and telecom distributed power systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC3824MPMSE#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 high-performance power management portfolio with rigorous automotive and industrial qualification standards.
The LTC3824MPMSE#PBF belongs to Linear's high-voltage buck controller product line, engineered specifically for reliable, low-quiescent-current DC/DC conversion in harsh environments including automotive under-hood, industrial automation, and telecom infrastructure.
FAQ
What is the guaranteed operating temperature range for the LTC3824MPMSE#PBF?
The LTC3824MPMSE#PBF is fully tested and guaranteed over –55°C to 150°C junction temperature, making it qualified for automotive under-hood and industrial high-temperature applications where standard commercial or industrial grades fail. This extended range is explicitly confirmed in the "Order Information" table and "Absolute Maximum Ratings" section of the official datasheet.
Does the LTC3824MPMSE#PBF support synchronization to an external clock?
Yes, the LTC3824MPMSE#PBF supports external synchronization via the SYNC/MODE pin (Pin 2). A rising-edge pulse above 1.3V threshold and frequency between 230kHz–600kHz (depending on RSET value) will lock the internal oscillator. The datasheet confirms synchronization is enabled only when VFB > 0.5V and specifies acceptable duty cycle range (10–70%) for reliable locking.
How does the LTC3824MPMSE#PBF achieve 40µA quiescent current?
The LTC3824MPMSE#PBF achieves 40µA quiescent current in Burst Mode operation, activated when SYNC/MODE is left open or pulled >2V. In this mode, the controller cycles between active regulation (VC ~0.8V) and deep sleep (VC ~70mV), disabling gate drive and oscillator between bursts - verified by Electrical Characteristics table showing 40µA typical IVCC under Burst Mode conditions.
Can the LTC3824MPMSE#PBF drive an N-channel MOSFET instead of a P-channel device?
No, the LTC3824MPMSE#PBF is specifically designed to drive external P-channel MOSFETs using high-side gate drive architecture. Its GATE pin outputs a voltage referenced to VCC (clamped to 8V below VCC), which is incompatible with standard N-MOSFET gate requirements. The datasheet block diagram, pin function description, and typical applications all exclusively specify P-MOSFET usage.
What is the purpose of the CAP pin (Pin 10) on the LTC3824MPMSE#PBF?
The CAP pin (Pin 10) on the LTC3824MPMSE#PBF connects to a ≥0.1µF low-ESR ceramic capacitor between CAP and VCC. This capacitor stabilizes the internal gate driver bias regulator, suppresses high-frequency noise coupling into the gate drive path, and ensures consistent 8V clamp performance - as mandated in the "Pin Functions" section and confirmed by the Typical Application schematic showing 0.1µF placement.
LTC3824MPMSE#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:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3824MPMSE#PBF FAQ
1.How can I place an order for LTC3824MPMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3824MPMSE#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 LTC3824MPMSE#PBF reliable?
The price and inventory of LTC3824MPMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3824MPMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3824MPMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3824MPMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3824MPMSE#PBF?
LTC3824MPMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3824MPMSE#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 LTC3824MPMSE#PBF?
For technical support, including LTC3824MPMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3824MPMSE#PBF requirements.
6.How does Aetrix verify that LTC3824MPMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3824MPMSE#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 LTC3824MPMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3824MPMSE#PBF?
All LTC3824MPMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3824MPMSE#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 LTC3824MPMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3824MPMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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