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Analog Devices Inc. LTC3536EMSE#PBF
- Part No.:
- LTC3536EMSE#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3536EMSE#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
LTC3536EMSE#PBF from Analog Devices (formerly Linear Technology) is a 1.8V–5.5V input, synchronous 4-switch buck-boost DC/DC converter delivering up to 1A continuous output current at ±1% voltage accuracy with programmable 300kHz–2MHz switching frequency and 32µA quiescent current in Burst Mode. It regulates output voltage regardless of whether input is above, below, or equal to VOUT - ideal for battery-powered RF and precision measurement systems where input voltage varies across discharge.
For engineers reviewing the LTC3536EMSE#PBF datasheet, LTC3536EMSE#PBF pinout, LTC3536EMSE#PBF application, or LTC3536EMSE#PBF equivalent, key selection criteria include its seamless buck-boost mode transitions, low-noise PWM operation, internal soft-start, output disconnect in shutdown, and thermal protection - all in a thermally enhanced 12-pin MSOP package rated for –40°C to 125°C junction temperature.
Technical Context
The LTC3536EMSE#PBF implements a proprietary 4-switch buck-boost topology with two integrated P-channel and two N-channel MOSFETs, enabling continuous regulation across VIN/VOUT crossover without discontinuities in inductor current or control loop transfer function. Its voltage-mode control loop uses an internal error amplifier with external Type III compensation via VC–FB network.
Switching is governed by a programmable oscillator (RT pin) or external synchronization via MODE/SYNC, supporting fixed-frequency PWM or variable-frequency Burst Mode. Input current limiting (2.5A typ), peak current limit (3.4A typ), and reverse current limit (0.55A typ) operate independently to protect during overload, short-circuit, and backfeed conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, LiFePO₄, or multi-cell alkaline/NiMH without pre-regulation. |
| Output Voltage Range | 1.8V to 5.5V - adjustable via FB resistor divider; feedback reference is 0.6V ±1% over full temperature range. |
| Continuous Output Current | 1A at VOUT = 3.3V and VIN ≥ 3V - limited by thermal performance and inductor DCR in boost-heavy conditions. |
| Quiescent Current | 32µA in Burst Mode - extends battery runtime in standby; drops to 1µA in shutdown. |
| Switching Frequency | 300kHz–2MHz - set by RT resistor or synchronized externally; default 1.2MHz when RT tied to VIN. |
| Output Voltage Accuracy | ±1% over load, line, and temperature - ensures stable supply for ADC references or RF synthesizers. |
| Package | 12-pin MSOP with exposed PGND pad - θJA = 40°C/W; requires soldered thermal pad for rated performance. |
Pinout & Package
The LTC3536EMSE#PBF is housed in a 12-lead plastic MSOP package with exposed thermal pad (Pin 13 = PGND). The exposed pad must be soldered to PCB ground for thermal integrity and optimal load regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator programming input | Resistor-to-GND sets fSW from 300kHz–2MHz; tie to VIN for 1.2MHz default. |
| SGND (Pin 2) | Analog ground reference | Separate Kelvin return for FB/VC; must be isolated from high-current PGND paths. |
| MODE/SYNC (Pin 3) | Operation mode control & sync input | Logic 0 = PWM; logic 1 = Burst Mode; external clock input for synchronization. |
| SW1 (Pin 4) | Switch node A/B connection | Connects to one end of buck-boost inductor; high di/dt path requiring short, wide trace. |
| SW2 (Pin 6) | Switch node C/D connection | Connects to other end of buck-boost inductor; symmetric layout critical for noise reduction. |
| VOUT (Pin 7) | Regulated power output | Requires low-ESR ceramic capacitor (≥22µF) placed adjacent with minimal loop area to PGND. |
| VIN (Pins 8,9) | Main power input | Accepts 1.8V–5.5V; bypass with ≥10µF low-ESR capacitor close to pins and PGND. |
| SHDN (Pin 10) | Enable/disable control | Logic high enables regulator; logic low disables with 1µA shutdown current and output disconnect. |
| FB (Pin 11) | Feedback voltage sensing | Monitors resistive divider; sets VOUT = 0.6V × (1 + RTOP/RBOT); input bias <50nA. |
| VC (Pin 12) | Error amplifier output | Connects to external Type III compensation network (RFF, CFF, CFB, CPOLE) for loop stability. |
| PGND (Pin 13, Exposed Pad) | Power ground return | Must be soldered to large PCB ground plane; primary thermal path and current return for all switches. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck-boost mode transition | Zero-output-voltage transient during VIN/VOUT crossover - eliminates need for sequencing or supervision. |
| Low-noise PWM operation | Fixed-frequency switching spectrum with minimized subharmonics - suitable for RF front-end power rails. |
| Burst Mode efficiency optimization | 32µA IQ at no load with automatic entry/exit - maintains >80% efficiency down to 100µA load. |
| Integrated protection suite | Overtemperature shutdown, input/peak/reverse current limiting, and undervoltage lockout (1.67V UVLO rising). |
| Internal 0.9ms soft-start | Linear ramp of error amplifier reference - prevents inrush into large output capacitors; resets on UVLO. |
Applications
| Wireless Inventory Terminals | Handheld Medical Instruments |
|---|---|
Use Scenario: Portable barcode scanners powered by single Li-ion cell (2.7–4.2V) requiring stable 3.3V rail for MCU and radio. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining 3.3V output as battery discharges below and above nominal voltage. Use Value: Eliminates need for separate buck and boost stages; enables compact design with 1A peak load support during scan bursts. |
Use Scenario: Battery-operated pulse oximeter with analog front-end demanding ultra-low-noise 2.5V supply. IC Role / Device Role / Timing Role: Low-ripple, low-EMI power source for precision ADC and op-amp circuitry. Use Value: Burst Mode reduces standby current to 32µA; PWM mode delivers <10mVpp ripple at 1A load for signal integrity. |
| Wireless Locators & Microphones | Supercapacitor Backup Power Supply |
Use Scenario: UWB-based indoor positioning tag using coin-cell battery and 3.3V BLE SoC. IC Role / Device Role / Timing Role: Efficient step-up from 1.8V cutoff to regulated 3.3V during transmit pulses. Use Value: 95% peak efficiency at light loads extends battery life; 12-pin MSOP fits tight form factor. |
Use Scenario: Real-time clock backup powered by supercapacitor (0.8–2.7V) supplying 3.3V to memory during main power loss. IC Role / Device Role / Timing Role: Bidirectional buck-boost maintaining VOUT despite wide-capacitor voltage swing. Use Value: Reverse current limit prevents supercapacitor over-discharge; output disconnect in shutdown preserves stored energy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Lower max output current (800mA), higher IQ in forced-PWM (120µA), no reverse current limit. | Suitable for cost-sensitive consumer wearables but lacks reverse protection for backup-supply use cases. | Select if footprint compatibility and lower BOM cost outweigh need for 1A output and reverse current blocking. |
| MAX77827AEWE+T | Higher input range (1.8V–5.5V same), integrated I²C interface, 1.2A output, but larger 16-pin WLP package. | Enables dynamic voltage scaling and telemetry in space-constrained IoT nodes where digital control is required. | Choose when system-level programmability and telemetry justify larger package and added firmware complexity. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3536EMSE#PBF offers superior reverse current protection, tighter output accuracy (±1% vs ±1.5%), and optimized thermal performance in MSOP - making it preferred for industrial and medical applications requiring robustness and precision under varying input conditions.
Availability
LTC3536EMSE#PBF is available at Aetrix Electronics and suitable for wireless inventory terminals, handheld medical instruments, and supercapacitor backup power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LTC3536EMSE#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 full technical and manufacturing continuity for all Linear power products.
The LTC3536EMSE#PBF belongs to Linear's high-efficiency buck-boost converter family, designed specifically for portable and battery-critical applications demanding seamless VIN/VOUT crossover, ultra-low quiescent current, and low-noise operation.
FAQ
What is the maximum continuous output current of the LTC3536EMSE#PBF?
The LTC3536EMSE#PBF delivers up to 1A continuous output current when VIN ≥ 3V and VOUT = 3.3V, with thermal derating at higher ambient temperatures or in boost-dominant configurations. At VIN = 1.8V and VOUT = 3.3V, maximum continuous output drops to 300mA due to increased inductor current requirements and reduced efficiency. Full derating curves are provided in the Typical Performance Characteristics section of the LTC3536EMSE#PBF datasheet.
Does the LTC3536EMSE#PBF support output voltage regulation when input voltage is below the output voltage?
Yes, the LTC3536EMSE#PBF is explicitly designed for buck-boost operation and maintains regulated output voltage whether VIN is above, below, or equal to VOUT - from 1.8V to 5.5V input and output ranges. Its 4-switch architecture enables seamless transitions between modes without output glitches or control-loop instability, as verified in the LTC3536EMSE#PBF block diagram and startup waveforms.
How is the switching frequency programmed on the LTC3536EMSE#PBF?
The LTC3536EMSE#PBF switching frequency is set via an external resistor from the RT pin to GND, with fSW (MHz) = 100 / RT (kΩ), covering 300kHz to 2MHz. Alternatively, tying RT to VIN selects the default 1.2MHz internal oscillator. For noise-sensitive designs, the MODE/SYNC pin accepts an external clock (0.3–2MHz) to synchronize switching and reduce EMI peaks - a capability confirmed in the LTC3536EMSE#PBF Electrical Characteristics table and Applications Information section.
What protection features does the LTC3536EMSE#PBF include?
The LTC3536EMSE#PBF integrates input current limit (2.5A typ), peak switch current limit (3.4A typ), reverse current limit (0.55A typ), overtemperature shutdown, undervoltage lockout (1.67V rising threshold), and output disconnect during shutdown. These protections are active across the full –40°C to 125°C operating junction temperature range and are validated in the Absolute Maximum Ratings and Electrical Characteristics tables of the LTC3536EMSE#PBF datasheet.
Is the LTC3536EMSE#PBF pin-compatible with other packages in the LTC3536 family?
No - the LTC3536EMSE#PBF uses a 12-pin MSOP package with distinct pinout (e.g., SHDN on Pin 10, FB on Pin 11, VC on Pin 12), while the DFN variant (e.g., LTC3536EDD#PBF) uses a 10-pin 3mm×3mm layout with different pin assignments (SHDN on Pin 8, FB on Pin 9, VC on Pin 10). PCB layout and thermal pad connection differ significantly; direct substitution requires redesign. This is explicitly documented in the LTC3536EMSE#PBF Pin Configuration diagrams.
LTC3536EMSE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 1A
- Frequency - Switching:
- 300kHz ~ 2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-MSOP-EP
LTC3536EMSE#PBF FAQ
1.How can I place an order for LTC3536EMSE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3536EMSE#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 LTC3536EMSE#PBF reliable?
The price and inventory of LTC3536EMSE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3536EMSE#PBF is usually 5 days.
3.What payment methods are accepted for LTC3536EMSE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3536EMSE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3536EMSE#PBF?
LTC3536EMSE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3536EMSE#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 LTC3536EMSE#PBF?
For technical support, including LTC3536EMSE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3536EMSE#PBF requirements.
6.How does Aetrix verify that LTC3536EMSE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3536EMSE#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 LTC3536EMSE#PBF meets industry standards.
7.What is the process for return or replacement of LTC3536EMSE#PBF?
All LTC3536EMSE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3536EMSE#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 LTC3536EMSE#PBF part is unused and in its original packaging.
Return procedure for LTC3536EMSE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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