My Inquiry
My Account
Analog Devices Inc. LT3500HMSE#PBF
- Part No.:
- LT3500HMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TFSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LT3500HMSE#PBF.pdf
- Description:
- IC REG DL BUCK/LINEAR 16MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT3500HMSE#PBF from Analog Devices (formerly Linear Technology) is a monolithic 2A step-down DC/DC converter with integrated linear regulator controller, operating from 3V to 40V input and delivering adjustable output down to 0.8V. It features internal 2.3A NPN switch, resistor-programmable 250kHz–2.2MHz switching frequency, soft-start/tracking capability, and power-good comparator with complementary outputs - used in automotive battery regulation and industrial distributed power systems.
For engineers reviewing the LT3500HMSE#PBF datasheet, LT3500HMSE#PBF pinout, LT3500HMSE#PBF application, or LT3500HMSE#PBF equivalent, key selection considerations include its –40°C to 150°C junction temperature rating, MSE-16 package thermal performance, dual-regulator control architecture, and linear driver (LDRV) output capability of 13mA with 0.8V reference tracking.
Technical Context
The LT3500HMSE#PBF implements current-mode PWM control with cycle-by-cycle current limiting, frequency foldback, and thermal shutdown. Its dual-error-amplifier architecture supports independent regulation of switching (FB) and linear (LFB) outputs, both referenced to 0.8V with ±16mV tolerance over full temperature range.
It integrates an internal NPN power switch (2.3A peak, 450mV saturation at 2A), BST boost circuitry for gate drive enhancement, and synchronized RT/SYNC interface supporting external clocking from 250kHz to 2.5MHz. The exposed pad (Pin 17) serves as primary GND and must be soldered for thermal management (θJC = 10°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3V to 36V operating; 40V absolute max - supports automotive battery transients and industrial 24V rails. |
| Switch Output Current | 2A continuous, 2.9A peak (MSE package) - enables compact 5V/1A + 3.3V/1A dual-output designs. |
| Switching Frequency | 250kHz to 2.2MHz, resistor- or sync-programmable - balances efficiency vs. external component size (e.g., 6.8μH inductor at 500kHz). |
| Feedback Reference | 0.8V ±16mV over –40°C to 150°C - ensures stable output regulation across extended automotive/industrial temp range. |
| Shutdown Current | <12μA typical - enables low-power battery backup modes without external enable sequencing. |
| LDRV Linear Driver | 13mA max output, 0.8V reference, 1.2V dropout at 5mA - drives external pass transistor or powers low-current analog circuitry. |
| Power Good Outputs | Complementary open-collector PG/PG with 30mV hysteresis - provides reliable system-level power sequencing and fault signaling. |
Pinout & Package
LT3500HMSE#PBF uses a thermally enhanced 16-lead plastic MSE package (3mm × 4mm footprint) with exposed pad (Pin 17) soldered to PCB ground for θJA = 45°C/W and θJC = 10°C/W. NC pins (1, 8, 9, 16) are electrically isolated and may be used for layout routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8, 9, 16 | No Connection | Electrically isolated; usable for PCB trace routing or thermal relief. |
| 2 (VIN) | Main Power Input | Powers internal bias circuits and connects to collectors of internal NPN switch and LDRV transistor; requires local high-dI/dt decoupling. |
| 3 (SHDN) | Enable/Shutdown Control | 0.76V threshold with hysteresis; floating or >0.76V enables operation; <0.71V disables with 12μA quiescent draw. |
| 4 (SS) | Soft-Start/Tracking Input | Controls ramp rate of both switching and linear outputs via external capacitor; enables output voltage tracking during startup. |
| 5, 6 (PG, PG) | Power-Good Status Outputs | Open-collector NPN outputs with 30mV hysteresis; PG sinks when FB/LFB < 90% of 0.8V; PG sinks when FB/LFB > 90% of 0.8V. |
| 7 (VC) | Error Amplifier Output | Transconductance amplifier output (150–350μmho); used for loop compensation, current clamping, or override control. |
| 10 (RT/SYNC) | Frequency Programming | Resistor-to-ground sets 250kHz–2.2MHz; external clock syncs on rising edge; internal 1V regulation enables precise frequency setting. |
| 11 (NC) | No Connection | Electrically isolated; no internal connection. |
| 12 (SW) | Switch Emitter | Emitter of internal NPN power switch; requires external Schottky catch diode and tight layout to minimize negative voltage spikes. |
| 13 (BST) | Bootstrap Supply | Drives NPN base above VIN via external capacitor/diode; minimum 2.2V boost voltage required for full switch saturation. |
| 14 (LDRV) | Linear Regulator Driver | Emitter of internal NPN linear driver; delivers up to 13mA with 0.8V reference tracking; configurable as LDO or external pass transistor driver. |
| 15 (LFB) | Linear Feedback Input | Negative input to linear error amplifier; regulates LDRV to maintain 0.8V at LFB; bias current flows out (115–300nA). |
| 17 (Exposed Pad) | Ground / Thermal Path | Primary GND connection and thermal conduction path; must be soldered to large copper area per datasheet layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Wide Input Range Support | 3V–40V operation enables direct use with 12V/24V automotive batteries and unregulated wall adapters without pre-regulation. |
| Dual-Regulator Architecture | Simultaneous control of buck (FB) and linear (LFB) outputs allows generation of clean, low-noise auxiliary rails (e.g., 3.3V logic + 1.8V analog) from single input. |
| Thermal Robustness | –40°C to 150°C guaranteed operating junction temperature (H-grade) supports under-hood automotive and high-ambient industrial environments. |
| Output Tracking Capability | SS pin controls ramp rate of both regulators, enabling precise power sequencing for FPGAs, DSPs, and multi-rail processors. |
| Short-Circuit Protection | Cycle-by-cycle current limit, frequency foldback, and thermal shutdown protect against sustained output shorts across full input range. |
Applications
| Automotive Battery Regulation | Industrial Distributed Power |
|---|---|
Use Scenario: Regulating 12V or 24V vehicle battery supply to stable 5V and 3.3V rails for infotainment ECUs and ADAS sensors. IC Role / Device Role / Timing Role: Primary dual-output power manager with integrated switch and linear controller; handles cold-crank (4.5V) and load-dump (40V) transients. Use Value: Eliminates need for external pre-regulator and discrete LDO; 150°C rating ensures reliability in engine compartment mounting. | Use Scenario: Generating isolated 3.3V and 5V supplies from 24V factory automation bus for PLC I/O modules and fieldbus interfaces. IC Role / Device Role / Timing Role: Compact, thermally efficient DC/DC + linear regulator subsystem; supports wide ambient temperature swings (–40°C to +85°C). Use Value: Reduces BOM count by integrating switch, controller, and linear driver; exposed pad enables conduction cooling on metal-core PCBs. |
| Wall Transformer Regulation | Dual Step-Down Converter Systems |
Use Scenario: Converting unregulated 9–24V AC/DC wall adapter output into tightly regulated 5V USB power and 3.3V microcontroller supply. IC Role / Device Role / Timing Role: Single-chip solution replacing discrete buck + LDO; soft-start prevents inrush into downstream capacitive loads. Use Value: Achieves >87% efficiency at 1A (500kHz, 4.7μH) while meeting EN55022 conducted emissions with minimal filtering. | Use Scenario: Implementing independent 5V@1A and 3.3V@1A outputs using shared inductor/capacitor resources in space-constrained embedded systems. IC Role / Device Role / Timing Role: Dual-output buck-linear hybrid controller; FB and LFB inputs allow separate feedback networks for each rail. Use Value: Enables true independent regulation (not just divider-based) with tracking soft-start, reducing system-level power sequencing complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck-linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3631EMSE#PBF | Single 3A buck only; no integrated linear regulator or LDRV pin; 4V–15V input; 150°C rating retained. | Requires external LDO for second rail; better suited for high-current single-output needs where linear regulation is not required. | Select when higher 3A buck current is needed and linear output is unnecessary or can be added externally. |
| LT3573EMSE#PBF | Single 2.25A buck with integrated 150mA LDO; 3.5V–40V input; same MSE-16 package; 125°C max junction. | Integrated LDO replaces LDRV function but lacks programmable linear driver flexibility and tracking capability. | Select when fixed 150mA LDO suffices and extended 150°C operation is not required. |
Compared with LTC3631EMSE#PBF and LT3573EMSE#PBF, LT3500HMSE#PBF uniquely combines 2A buck conversion, 13mA programmable linear driver, and dual-rail tracking soft-start in a 150°C-rated MSE package - making it optimal for thermally demanding dual-rail applications requiring design flexibility.
Availability
LT3500HMSE#PBF is available at Aetrix Electronics and suitable for automotive battery regulation, industrial distributed power, and wall transformer regulation requiring stable component supply across extended temperature ranges.
Supply support for LT3500HMSE#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 with rigorous automotive and industrial qualification standards.
The LT3500 product line was designed for rugged dual-output DC/DC conversion in harsh environments - specifically targeting automotive, industrial, and telecom infrastructure applications needing extended temperature operation and integrated linear regulation capability.
FAQ
What is the maximum junction temperature rating for LT3500HMSE#PBF?
The LT3500HMSE#PBF is guaranteed to operate over a junction temperature range of –40°C to 150°C. This H-grade rating is validated per datasheet Note 2 and distinguishes it from E/I-grade variants limited to 125°C. Thermal derating applies above 125°C to ensure long-term reliability.
How does the LT3500HMSE#PBF implement output voltage tracking during startup?
The LT3500HMSE#PBF uses the SS pin to control ramp rate for both switching and linear regulators. A single capacitor from SS to GND generates a linear voltage ramp; the FB and LFB amplifiers track this ramp minus fixed offsets (100mV for FB, 115mV for LFB), ensuring coordinated soft-start of both outputs without external circuitry.
Can the LDRV pin of LT3500HMSE#PBF drive an external PNP transistor?
No - the LDRV pin is the emitter of an internal NPN transistor and sources current only. It is designed to drive N-channel MOSFET gates (via level-shifting) or NPN pass transistors in emitter-follower configuration. Driving a PNP would require sourcing current into its base, which is incompatible with LDRV's NPN emitter output topology.
What is the minimum boost capacitor voltage required for reliable operation of LT3500HMSE#PBF?
The LT3500HMSE#PBF requires a minimum boost voltage of 2.2V across the BST capacitor (at 25°C) to guarantee full saturation of the internal NPN switch. At 150°C, this increases to 2.7V per Figure G20. Insufficient BST voltage causes increased switch drop, reduced efficiency, and potential thermal overload.
Does LT3500HMSE#PBF support synchronization to an external clock signal?
Yes - the RT/SYNC pin accepts external TTL/CMOS clock signals from 250kHz to 2.5MHz. Synchronization occurs on the rising edge; the internal oscillator resets and locks to the applied frequency. The gain control loop automatically adjusts slope compensation to prevent subharmonic oscillation during sync mode.
LT3500HMSE#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
- Topology:
- Step-Down (Buck) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 500kHz ~ 2.4MHz
- Voltage/Current - Output 1:
- 0.8V ~ 38.9V, 2A
- Voltage/Current - Output 2:
- Adjustable, 13mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 3V ~ 36V
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-MSOP-EP
LT3500HMSE#PBF FAQ
1.How can I place an order for LT3500HMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT3500HMSE#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 LT3500HMSE#PBF reliable?
The price and inventory of LT3500HMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT3500HMSE#PBF is usually 5 days.
3.What payment methods are accepted for LT3500HMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT3500HMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT3500HMSE#PBF?
LT3500HMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT3500HMSE#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 LT3500HMSE#PBF?
For technical support, including LT3500HMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT3500HMSE#PBF requirements.
6.How does Aetrix verify that LT3500HMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LT3500HMSE#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 LT3500HMSE#PBF meets industry standards.
7.What is the process for return or replacement of LT3500HMSE#PBF?
All LT3500HMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT3500HMSE#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 LT3500HMSE#PBF part is unused and in its original packaging.
Return procedure for LT3500HMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT3500HMSE#PBF Tags
-
TPS6521905RHBR
Texas Instruments
-
MIC3385YHL-TR
Microchip Technology
-
A4402ELPTR-T
Allegro MicroSystems
-
LM26480SQ-AA/NOPB
Texas Instruments
-
A4402KLPTR-T
Allegro MicroSystems
-
BD71847AMWV-E2
ROHM Semiconductor
-
ADP5040ACPZ-1-R7
Analog Devices Inc.
-
LT3048IDC#TRPBF
Analog Devices Inc.
-
ADP5037ACPZ-R7
Analog Devices Inc.
-
XRP7714ILB-F
MaxLinear, Inc.
-
LTC3260EDE#TRPBF
Analog Devices Inc.
-
LTC3260EMSE#PBF
Analog Devices Inc.
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…
