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Analog Devices Inc. LTC3824HMSE#PBF
- Part No.:
- LTC3824HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3824HMSE#PBF.pdf
- Description:
- IC REG CTRLR BUCK 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,340
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Product details
Overview
LTC3824HMSE#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 buck configurations, features 40µA quiescent current in Burst Mode, and supports programmable switching frequency up to 600kHz - ideal for automotive load-dump-tolerant 5V/12V power supplies.
For engineers reviewing the LTC3824HMSE#PBF datasheet, LTC3824HMSE#PBF pinout, LTC3824HMSE#PBF application, or LTC3824HMSE#PBF equivalent, key selection criteria include its –40°C to 150°C guaranteed operating junction temperature, 10-lead MSE thermally enhanced MSOP package with exposed ground pad, P-channel gate drive capability (8V clamp, 2.5A peak), and precise 0.788V–0.812V reference voltage tolerance across temperature.
Technical Context
The LTC3824HMSE#PBF implements a transconductance error amplifier (gm = 220–370 µmho) controlling a current-mode PWM loop with fixed-frequency operation. Its VC pin serves as both error amplifier output and current limit comparator threshold, enabling direct inductor current regulation via the SENSE pin with 75–120mV current-sense threshold.
Burst Mode operation is enabled by leaving SYNC/MODE open or pulling >2V, reducing quiescent current to 40µA while maintaining regulation; shutdown is activated when VC drops ≤25mV, drawing only 5–15µA. Frequency is set by RSET (200–600kHz range), and synchronization is supported over 230–600kHz with 1.3V rising-edge threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports automotive battery systems including 12V/24V rails and transient load-dump conditions up to 60V. |
| Quiescent Current (Burst Mode) | 40µA typical - enables multi-day battery runtime in always-on automotive modules. |
| Reference Voltage (VREF) | 0.788V to 0.812V (H-grade) - ensures ±1.5% output voltage accuracy over –40°C to 150°C junction temperature. |
| Switching Frequency Range | 200kHz to 600kHz - programmable via RSET resistor; higher frequencies allow smaller magnetics but increase switching losses. |
| Gate Drive Capability | 8V clamp (VCC > 9V), 2.5A peak source/sink - sufficient to fully enhance industrial P-channel MOSFETs like Si7465DP with low Qg. |
| Current Sense Threshold | 75mV to 120mV - sets maximum output current via external sense resistor; enables accurate 3.3A current limiting in design examples. |
| Operating Junction Temp | –40°C to 150°C - qualified for under-hood automotive applications requiring extended thermal robustness. |
Pinout & Package
The LTC3824HMSE#PBF is housed in a 10-lead plastic MSOP (MSE) package with exposed thermal pad (Pin 11), rated θJC = 3°C/W and θJA = 43°C/W. The exposed pad must be soldered to PCB ground for thermal performance and EMI control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 11) | Power and Signal Ground Reference | Pin 11 is exposed thermal pad - must be soldered to large PCB ground plane for thermal dissipation and noise immunity. |
| SYNC/MODE (Pin 2) | Burst Mode Enable / Sync Input | Open or >2V enables Burst Mode (40µA IQ); grounded or sync pulse >20kHz disables Burst Mode and enables pulse-skipping. |
| RSET (Pin 3) | Oscillator Frequency Set | Resistor to GND programs switching frequency from 200kHz to 600kHz; 392kΩ yields ~200kHz, 200kΩ yields ~400kHz. |
| VC (Pin 4) | Error Amplifier Output / PWM Control | 0.7V turn-on threshold; regulates inductor current; <25mV triggers micropower shutdown (7–15µA). |
| VFB (Pin 5) | Feedback Input | Compares against 0.8V internal reference; <0.5V triggers 50kHz foldback for short-circuit protection. |
| SS (Pin 6) | Soft-Start Control | Capacitor to GND sets ramp time: tSS ≈ (C × 0.8V)/5µA; resistor to GND resets capacitor during shutdown. |
| SENSE (Pin 7) | Current Sense Input | Measures VCC–VSENSE; 100mV threshold sets current limit; requires Kelvin connection for accuracy. |
| VCC (Pin 8) | IC Power Supply | 4V–60V input; bypass capacitor required; powers internal regulator and gate driver bias circuitry. |
| GATE (Pin 9) | P-Channel MOSFET Driver Output | Drives external P-MOSFET gate; clamped to 8V below VCC when VCC > 9V; 2.5A peak current capability. |
| CAP (Pin 10) | Gate Driver Bias Capacitor | Requires ≥0.1µF low-ESR capacitor to VCC to stabilize internal 8V regulator for consistent gate drive. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current in Burst Mode | 40µA enables >100-hour battery runtime at 1mA load in automotive telematics modules. |
| 100% duty cycle capability | Supports very low dropout operation - critical for cold-cranking scenarios where VIN drops near VOUT. |
| Programmable soft-start | Capacitor-controlled ramp prevents inrush current and stabilizes feedback loop during startup. |
| Integrated current limit with adjustable threshold | 75–120mV sense voltage allows precise 2A–3.3A current limiting using standard 0.025Ω–0.03Ω resistors. |
| Thermally enhanced MSE package | Exposed pad and θJC = 3°C/W enable >3W power dissipation without heatsink in compact layouts. |
Applications
| Automotive Infotainment Power Supply | Industrial 24V-to-5V Conversion |
|---|---|
Use Scenario: Powering DSPs, displays, and USB peripherals in vehicle head units with 9–16V nominal battery input and 60V load-dump transients. IC Role / Device Role / Timing Role: Primary step-down controller regulating stable 5V rail; manages P-MOSFET switch timing and current sensing for overcurrent protection. Use Value: 150°C junction rating and 60V input withstand ensure uninterrupted operation during engine cranking and alternator surges. | Use Scenario: Converting 24V factory bus to isolated 5V/12V logic rails for PLC I/O modules and sensor interfaces. IC Role / Device Role / Timing Role: High-efficiency buck controller driving discrete P-MOSFET; provides constant-frequency PWM with tight voltage regulation under variable loads. Use Value: 40µA Burst Mode IQ extends uptime in battery-backed controllers; programmable frequency avoids EMI-sensitive bands. |
| Telecom Distributed Power | High-Voltage DC-DC Intermediate Bus |
Use Scenario: Generating local 3.3V/5V rails from 48V telecom backplane in base station RF cards and optical line cards. IC Role / Device Role / Timing Role: Secondary-side controller managing high-side P-MOSFET switch; synchronizes to system clock to reduce conducted EMI. Use Value: Easy synchronization (230–600kHz range) and 1.3V sync threshold simplify integration into multi-rail telecom power architectures. | Use Scenario: Building intermediate 12V bus from 36–60V HVDC sources in EV charging infrastructure and solar microinverters. IC Role / Device Role / Timing Role: Robust step-down controller handling wide VIN range and high ambient temperatures; drives high-voltage P-MOSFETs with 8V gate clamp. Use Value: Guaranteed operation to 150°C junction temperature eliminates derating in enclosed, convection-cooled enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3892EMSE#PBF | Dual-output, 60V input, 3.5A integrated gate drivers; includes second channel and PMBus interface. | Required for dual-rail systems (e.g., ±12V analog supplies); adds complexity and cost for single-output use. | Select LTC3824HMSE#PBF for cost-sensitive, single-output, high-temp automotive designs where simplicity and thermal margin are prioritized. |
| MP2482DS-LF-Z | Monolithic 60V buck converter (integrated MOSFET); 2A rated; 100µA IQ; no Burst Mode; MSOP-10 package. | Lacks programmable frequency, external MOSFET flexibility, and ultra-low 40µA Burst Mode IQ. | Choose LTC3824HMSE#PBF when discrete P-MOSFET selection (e.g., for >60V breakdown or low RDS(on)) or sub-100µA light-load efficiency is mandatory. |
Compared with LTC3892EMSE#PBF and MP2482DS-LF-Z, the LTC3824HMSE#PBF offers superior thermal qualification (150°C), lowest quiescent current in Burst Mode (40µA), and full external P-MOSFET control - making it optimal for space-constrained, high-reliability automotive and industrial step-down applications demanding long-term stability at elevated temperatures.
Availability
LTC3824HMSE#PBF is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial 24V-to-5V conversion, and telecom distributed power supplies requiring stable component supply with guaranteed 150°C operation and long-lifecycle support.
Supply support for LTC3824HMSE#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 high-performance power management portfolio. Linear pioneered precision analog and power ICs for demanding industrial and automotive applications.
The LTC3824HMSE#PBF belongs to Linear's high-voltage buck controller family, engineered specifically for ruggedized DC/DC conversion in environments with wide input transients, extreme temperatures, and strict efficiency requirements.
FAQ
What is the guaranteed operating junction temperature range for the LTC3824HMSE#PBF?
The LTC3824HMSE#PBF is guaranteed to operate from –40°C to 150°C junction temperature. This H-grade qualification exceeds standard industrial (–40°C to 125°C) and matches requirements for under-hood automotive applications, including engine control units and ADAS sensors where ambient temperatures exceed 105°C.
How does the LTC3824HMSE#PBF achieve 40µA quiescent current?
The LTC3824HMSE#PBF achieves 40µA quiescent current by entering Burst Mode operation when the SYNC/MODE pin is left open or pulled above 2V. In this mode, the controller cycles between active regulation and deep sleep, disabling gate drive and oscillator to minimize bias current - confirmed at VCC ≤ 60V and VC = 0.6V per datasheet electrical characteristics.
Can the LTC3824HMSE#PBF drive N-channel MOSFETs?
No, the LTC3824HMSE#PBF is designed exclusively for external P-channel MOSFETs. Its GATE pin provides high-side drive referenced to VCC with an 8V clamp and 2.5A peak current, optimized for P-MOSFET gate enhancement. Driving N-channel devices would require a floating high-side gate driver not present in the LTC3824HMSE#PBF architecture.
What is the purpose of the CAP pin on the LTC3824HMSE#PBF?
The CAP pin on the LTC3824HMSE#PBF connects to a ≥0.1µF low-ESR capacitor tied to VCC, forming the output filter for the internal 8V gate driver regulator. This capacitor stabilizes the bias voltage supplied to the gate driver circuitry, ensuring consistent 2.5A peak source/sink capability and preventing gate drive droop during high-frequency switching.
Does the LTC3824HMSE#PBF support synchronization to an external clock?
Yes, the LTC3824HMSE#PBF supports external synchronization via the SYNC/MODE pin. A rising-edge sync pulse with threshold ~1.3V and duty cycle 10–70% can lock the internal oscillator to frequencies from 230kHz to 600kHz (depending on RSET value), enabling EMI reduction and multi-phase interleaving in complex power systems.
LTC3824HMSE#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 ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP-EP
LTC3824HMSE#PBF FAQ
1.How can I place an order for LTC3824HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3824HMSE#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 LTC3824HMSE#PBF reliable?
The price and inventory of LTC3824HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3824HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3824HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3824HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3824HMSE#PBF?
LTC3824HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3824HMSE#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 LTC3824HMSE#PBF?
For technical support, including LTC3824HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3824HMSE#PBF requirements.
6.How does Aetrix verify that LTC3824HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3824HMSE#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 LTC3824HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3824HMSE#PBF?
All LTC3824HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3824HMSE#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 LTC3824HMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3824HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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