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Analog Devices Inc. LTC3824EMSE#PBF
- Part No.:
- LTC3824EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3824EMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,275
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Product details
Overview
LTC3824EMSE#PBF from Analog Devices (formerly Linear Technology) is a high-voltage 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 constant-frequency current-mode control up to 600kHz, and achieves 40µA quiescent current in Burst Mode for extended battery runtime in low-load applications.
For engineers reviewing the LTC3824EMSE#PBF datasheet, LTC3824EMSE#PBF pinout, LTC3824EMSE#PBF application, or LTC3824EMSE#PBF equivalent, key selection criteria include its 10-lead MSE package thermal performance, programmable soft-start and current limit, 8V gate drive capability for high-voltage P-MOSFETs, and 50kHz foldback protection during output short-circuit events.
Technical Context
The LTC3824EMSE#PBF implements a transconductance error amplifier (gm = 220–370 µmho) that regulates output voltage via a 0.788–0.816V reference and controls the current-mode PWM loop through the VC pin. Its internal oscillator supports frequency programming from 200kHz to 600kHz using an external RSET resistor and allows synchronization with external clocks above 230kHz.
Burst Mode operation is enabled by leaving SYNC/MODE open or pulling it >2V, reducing quiescent current to 40µA while maintaining regulation; disabling Burst Mode (by grounding SYNC/MODE) forces pulse-skipping at light loads. The controller includes 50kHz switching frequency foldback when VFB drops below 0.5V-critical for short-circuit protection-and micropower shutdown triggered when VC falls below 25mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports wide industrial and automotive supply rails including load-dump transients. |
| Quiescent Current (Burst Mode) | 40µA typical - enables multi-day battery operation in always-on systems. |
| Switching Frequency Range | 200kHz to 600kHz - balances EMI, efficiency, and component size; programmable via RSET resistor. |
| Gate Drive Capability | 8V clamp (VCC > 10V), ±2.5A peak - drives high-threshold P-channel MOSFETs reliably without external level-shifting. |
| Current Limit Threshold | 75–120mV across VCC–SENSE - sets overcurrent protection with 100mV nominal threshold and temperature-compensated tolerance. |
| Reference Voltage Accuracy | ±1.5% over –40°C to 125°C - ensures stable output regulation across full operating temperature range. |
| Soft-Start Current | 2.5–8µA - linearly ramps output voltage via external capacitor to prevent inrush current and overshoot. |
Pinout & Package
The LTC3824EMSE#PBF is housed in a thermally enhanced 10-lead MSE (MSOP) package with exposed pad (Pin 11) soldered to PCB ground for optimal thermal dissipation (θJC = 3°C/W). Package dimensions: 3.00mm × 3.00mm × 1.10mm, 0.5mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 11) | Power and signal ground reference | Exposed pad (Pin 11) must be soldered to PCB ground plane to achieve rated θJA = 43°C/W thermal performance. |
| SYNC/MODE (Pin 2) | Mode selection and sync input | Open or >2V enables Burst Mode; grounded disables Burst Mode and enables pulse-skipping; rising-edge sync threshold = 1.3V. |
| RSET (Pin 3) | Oscillator frequency programming | Resistor to GND sets switching frequency (e.g., 392kΩ → 200kHz); VRSET = 1.2V nominal. |
| VC (Pin 4) | Error amplifier output / PWM control | 0.7V threshold starts switching; <25mV triggers micropower shutdown; 0.84V threshold enters Burst Mode. |
| VFB (Pin 5) | Inverting input of error amplifier | Regulates output to 0.8V reference; <0.5V triggers 50kHz foldback for short-circuit protection. |
| SS (Pin 6) | Soft-start timing control | Capacitor to GND sets ramp time: tSS ≈ (CSS × 0.8V)/5µA; resistor to GND resets capacitor during shutdown. |
| SENSE (Pin 7) | Current sense input | Monitors voltage drop across external sense resistor (RS); 100mV threshold sets current limit. |
| VCC (Pin 8) | Controller power supply | 4V–60V input; requires local bypassing; powers internal regulator for gate driver bias. |
| GATE (Pin 9) | P-channel MOSFET gate driver output | Clamped to 8V above VCAP when VCC > 9V; ±2.5A peak drive supports fast switching of high-Qg MOSFETs. |
| CAP (Pin 10) | Internal regulator bypass | Requires ≥0.1µF low-ESR capacitor to VCC to stabilize gate driver bias voltage under transient loads. |
Key Features
| Feature | Design Value |
|---|---|
| Very low dropout operation | Supports 100% duty cycle - enables regulation down to VIN – VOUT ≈ 0V, critical for high-input/low-output ratio designs. |
| Programmable current limit | Set via external sense resistor RS - provides precise overcurrent protection independent of MOSFET RDS(ON) drift. |
| Easy synchronization | Wide sync frequency range (230–600kHz) and 10–70% duty-cycle tolerance - simplifies multi-rail system clock alignment. |
| Thermally enhanced MSE package | θJC = 3°C/W with exposed pad - enables high-power operation in compact industrial layouts without heatsinks. |
| Short-circuit foldback protection | Automatic 50kHz frequency reduction when VFB < 0.5V - limits inductor current runaway and improves fault recovery. |
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, surviving 60V load-dump transients. IC Role / Device Role / Timing Role: High-voltage step-down controller regulating output via external P-MOSFET; provides Burst Mode for standby current <50µA. Use Value: 40µA quiescent current extends battery life during vehicle sleep mode; 60V absolute max input withstands ISO 7637-2 pulse 5a. | Use Scenario: Distributed 24V DC bus powers isolated 5V/1A logic rails in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Constant-frequency current-mode controller driving P-MOSFET with programmable soft-start to prevent backplane brownouts during hot-swap. Use Value: Programmable RSET (200–600kHz) allows EMI tuning; 100% duty cycle supports 24V-to-5V conversion without external LDO post-regulation. |
| Telecom Remote Radio Unit | Distributed Power System Board |
Use Scenario: 48V telecom rectifier supplies 12V/2A for RF amplifiers in outdoor base stations operating from –40°C to +85°C. IC Role / Device Role / Timing Role: High-efficiency buck controller with 8V gate drive enabling use of low-RDS(ON) P-MOSFETs; Burst Mode reduces idle power in low-traffic periods. Use Value: Guaranteed –40°C to 125°C operation (E-grade) ensures reliability in uncooled enclosures; 40µA IQ minimizes heat generation in sealed housings. | Use Scenario: Central 48V supply feeds multiple point-of-load converters on server motherboard; LTC3824EMSE#PBF used for 3.3V/5A intermediate bus. IC Role / Device Role / Timing Role: Synchronizable controller allowing phase-shifted operation across multiple rails to reduce input ripple current. Use Value: Sync input accepts 230–600kHz clocks - enables interleaving with other LTC3824-based rails to halve input capacitor RMS current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT3748EMSE#PBF | Isolated flyback controller with integrated transformer driver; no P-MOSFET gate drive; requires external optocoupler feedback. | Designed for isolated outputs (e.g., 5V@1A from 24V input), not non-isolated buck topologies. | Select only when galvanic isolation is required; not a functional replacement for LTC3824EMSE#PBF's non-isolated P-channel buck architecture. |
| LM5116MH/NOPB | High-voltage synchronous buck controller (N-MOSFET driver); 65V max input; 100µA IQ in skip mode; no Burst Mode. | Drives N-channel high-side MOSFETs requiring bootstrap circuitry; lacks 40µA ultra-low IQ for battery-sensitive apps. | Prefer for higher-current (>5A), higher-efficiency designs where synchronous rectification justifies added complexity and cost. |
Compared with LT3748EMSE#PBF and LM5116MH/NOPB, the LTC3824EMSE#PBF uniquely combines P-channel MOSFET drive simplicity, 40µA Burst Mode IQ, and 60V input rating - making it optimal for space-constrained, battery-backed industrial buck regulators where isolation and synchronous efficiency are secondary priorities.
Availability
LTC3824EMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, 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 LTC3824EMSE#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 precision analog and power management portfolio. Linear pioneered high-performance DC/DC controllers with industry-leading efficiency and integration.
The LTC3824EMSE#PBF belongs to Linear's high-voltage buck controller family, engineered specifically for rugged industrial and automotive power conversion where input transients, low-noise operation, and ultra-low standby power are critical design constraints.
FAQ
What is the maximum input voltage rating for the LTC3824EMSE#PBF?
The LTC3824EMSE#PBF has an absolute maximum input voltage rating of 65V on the VCC pin, with guaranteed operation from 4V to 60V. This makes it suitable for automotive applications subject to ISO 7637-2 load-dump pulses up to 60V, provided proper input filtering is implemented per the datasheet layout guidelines.
Does the LTC3824EMSE#PBF support synchronous rectification?
No, the LTC3824EMSE#PBF is designed exclusively for driving external P-channel MOSFETs in a nonsynchronous buck topology. It does not provide gate drive signals compatible with N-channel synchronous rectifiers or integrated synchronous FETs. A catch diode (e.g., Schottky) is required in all designs using the LTC3824EMSE#PBF.
How is the switching frequency programmed on the LTC3824EMSE#PBF?
The switching frequency of the LTC3824EMSE#PBF is set by an external resistor (RSET) connected from Pin 3 (RSET) to ground. For example, a 392kΩ resistor yields 200kHz, while 200kΩ gives approximately 400kHz. The relationship is nonlinear and documented in the "Switching Frequency vs RSET" graph in the datasheet.
What thermal considerations apply to the LTC3824EMSE#PBF's exposed pad?
Pin 11 (exposed pad) of the LTC3824EMSE#PBF is electrically GND and must be soldered to a PCB copper pour with thermal vias to internal ground planes. Failure to do so degrades θJA from 43°C/W to >80°C/W, risking thermal shutdown at >1W dissipation. Minimum recommended copper area is 100mm² with ≥6×0.3mm vias.
Can the LTC3824EMSE#PBF operate with 100% duty cycle?
Yes, the LTC3824EMSE#PBF supports 100% duty cycle operation, enabling output voltages approaching the input rail (e.g., 5.5V out from 6V in). This is achieved by disabling the internal minimum off-time circuitry when the VC pin voltage reaches its upper limit, allowing continuous conduction mode without forced discontinuous operation.
LTC3824EMSE#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
LTC3824EMSE#PBF FAQ
1.How can I place an order for LTC3824EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3824EMSE#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 LTC3824EMSE#PBF reliable?
The price and inventory of LTC3824EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3824EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3824EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3824EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3824EMSE#PBF?
LTC3824EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3824EMSE#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 LTC3824EMSE#PBF?
For technical support, including LTC3824EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3824EMSE#PBF requirements.
6.How does Aetrix verify that LTC3824EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3824EMSE#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 LTC3824EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3824EMSE#PBF?
All LTC3824EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3824EMSE#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 LTC3824EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3824EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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