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Analog Devices Inc. LTC3536EMSE#TRPBF
- Part No.:
- LTC3536EMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3536EMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:318
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Product details
Overview
LTC3536EMSE#TRPBF 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 operates seamlessly across buck, boost, and pass-through regions-ideal for RF power supplies and portable medical instrumentation where input voltage may dip below or rise above the regulated 3.3V output.
For engineers reviewing the LTC3536EMSE#TRPBF datasheet, LTC3536EMSE#TRPBF pinout, LTC3536EMSE#TRPBF application, or LTC3536EMSE#TRPBF equivalent, key selection criteria include its low-noise buck-boost topology, internal soft-start (0.9ms), output disconnect in shutdown (1µA), reverse current limiting (0.55A), and thermally enhanced 12-pin MSOP package with exposed PGND pad.
Technical Context
The LTC3536EMSE#TRPBF implements a proprietary 4-switch synchronous buck-boost architecture with dual N-channel and dual P-channel MOSFETs, enabling regulation when VIN is above, below, or equal to VOUT without mode transition artifacts. Its voltage-mode control loop uses an internal error amplifier (90dB AVOL) with external Type III compensation via VC–FB network.
Switching is governed by a resistor-programmable oscillator (RT pin) or external synchronization via MODE/SYNC pin (0.3–2MHz), while Burst Mode operation dynamically disables switching pulses to maintain regulation at light loads-reducing quiescent current to 32µA without compromising transient response.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, or supercapacitor inputs without pre-regulation. |
| Output Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable reference for precision analog or RF circuitry. |
| Continuous Output Current | 1A at VIN ≥ 3V, VOUT = 3.3V - sufficient for microcontrollers, sensors, and wireless transceivers. |
| Quiescent Current (Burst) | 32µA - extends battery life in always-on handheld devices like medical monitors. |
| Switching Frequency Range | 300kHz to 2MHz - enables compact 4.7µH inductor selection and EMI filtering flexibility. |
| Shutdown Current | 1µA - guarantees near-zero leakage during system sleep states. |
| Feedback Reference Voltage | 0.6V (±0.5% over temp) - simplifies resistor-divider design for adjustable outputs from 1.8V to 5.5V. |
Pinout & Package
The LTC3536EMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package (MSE) with exposed PGND pad (Pin 13) requiring soldering to PCB for optimal thermal and electrical performance (θJA = 40°C/W).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming | Resistor-to-GND sets fSW = 100/RT(kΩ); tie to VIN for 1.2MHz default. |
| SGND (Pin 2) | Analog ground reference | Kelvin-connected ground for FB/VC to minimize noise coupling into error amplifier. |
| MODE/SYNC (Pin 3) | Operation mode control & sync input | Logic 0 = PWM; logic 1 = Burst Mode; external clock input (0.3–2MHz) for EMI reduction. |
| SW1 (Pin 4) | High-side switch node | Connects to inductor and internal PMOS A / NMOS B; requires short, wide PCB trace. |
| SW2 (Pin 6) | Low-side switch node | Connects to inductor and internal PMOS D / NMOS C; symmetric layout critical for ripple suppression. |
| VOUT (Pin 7) | Regulated power output | Delivers up to 1A; requires low-ESR 22µF ceramic capacitor placed adjacent to pin. |
| VIN (Pins 8,9) | Main power input | Accepts 1.8–5.5V; bypassed with ≥10µF low-ESR capacitor close to pins. |
| SHDN (Pin 10) | Enable/disable control | Active-high; pulls total supply current to <1µA in shutdown with output disconnect. |
| FB (Pin 11) | Feedback voltage sensing | Monitors resistive divider (VOUT → RTOP → FB → RBOT → GND); sets output per VOUT = 0.6V × (1 + RTOP/RBOT). |
| VC (Pin 12) | Error amplifier output | Drives 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 copper area; serves as primary return path for high-current switches. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise buck-boost topology | Eliminates subharmonics and mode-transition transients-critical for RF front-ends and ADC reference supplies. |
| Internal soft-start (0.9ms typical) | Linear ramp of error amplifier reference prevents inrush current; unaffected by output capacitance or load. |
| Reverse current limit (0.55A typ) | Disables PMOS D if reverse current exceeds threshold-protects device during power-up/down sequencing with auxiliary supplies. |
| Input current limit (2.5A typ) | Injects proportional current into FB pin to throttle output-enables smooth recovery after overload without latch-off. |
| Peak current limit (3.4A typ) | Hardware-based cutoff of PMOS A during hard shorts-adds fast-response protection layer beyond average current limiting. |
Applications
| Wireless Inventory Terminals | Handheld Medical Instruments |
|---|---|
Use Scenario: Portable barcode scanners powered by single-cell Li-ion (2.7–4.2V) requiring stable 3.3V for MCU and BLE radio. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining 3.3V output regardless of battery voltage sag during transmit bursts. Use Value: Seamless VIN-to-VOUT crossover avoids brownouts during RF transmission; 32µA Burst Mode extends scan session time between charges. |
Use Scenario: Battery-powered pulse oximeter with analog front-end (AFE) and OLED display demanding ultra-low-noise 3.3V supply. IC Role / Device Role / Timing Role: Low-ripple power source for precision ADC reference and sensor biasing, operating in fixed-frequency PWM mode. Use Value: <1% output voltage drift and <20mVpp ripple in PWM mode ensure accurate SpO₂ calculation; 125°C junction rating supports sterilization environments. |
| Wireless Locators / Microphones | Supercapacitor Backup Power Supply |
Use Scenario: Ultra-low-power UWB tag with intermittent wake-up cycles and burst data transmission. IC Role / Device Role / Timing Role: Efficient energy harvester interface converting variable 1.8–3.6V input (e.g., from piezoelectric or RF harvesters) to regulated 3.3V. Use Value: 32µA quiescent current in Burst Mode minimizes standby drain; programmable fSW allows optimization for harvester impedance matching. |
Use Scenario: Industrial controller retaining SRAM and real-time clock during AC mains failure using 2.7V supercapacitor bank. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing charge/discharge between supercap and 3.3V rail with reverse current blocking. Use Value: Active reverse current limit prevents supercap self-discharge through IC; output disconnect in shutdown eliminates parasitic load. |
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 | Fixed 3.3V output only; no adjustable FB; 2.5A max output; higher IQ (25µA) but no Burst Mode. | Suitable for cost-sensitive designs needing fixed output and higher current, but lacks flexible feedback and ultra-low-light-load efficiency. | Select TPS63020DSJR only if output voltage is fixed and peak current >1A is required; avoid when adjustable VOUT or <32µA IQ is mandatory. |
| MAX77827BEWC+T | Wider input range (2.5–5.5V); integrated I²C interface; 1.2A output; 20µA IQ in ultra-low-power mode. | Preferred for systems requiring dynamic voltage scaling or telemetry via I²C, but adds firmware complexity and lacks MSOP thermal performance. | Choose MAX77827BEWC+T when digital control and telemetry are needed; LTC3536EMSE#TRPBF remains superior for analog-critical, low-noise, or thermally constrained layouts. |
Compared with TPS63020DSJR and MAX77827BEWC+T, the LTC3536EMSE#TRPBF uniquely combines adjustable output, true 1.8V start-up, lowest noise spectral profile, and industry-leading thermal resistance in MSOP-making it optimal for space-constrained, noise-sensitive, and battery-life-critical applications.
Availability
LTC3536EMSE#TRPBF is available at Aetrix Electronics and suitable for wireless inventory terminals, handheld medical instruments, wireless locators/microphones, and supercapacitor backup power supplies requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LTC3536EMSE#TRPBF 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 of high-performance power management ICs with rigorous automotive and industrial qualification standards.
The LTC3536EMSE#TRPBF belongs to Linear's precision buck-boost regulator family, engineered specifically for applications where input voltage uncertainty, low noise, and ultra-low quiescent current must coexist-such as portable RF, medical, and energy-harvesting systems.
FAQ
What is the minimum input voltage required for the LTC3536EMSE#TRPBF to start switching?
The LTC3536EMSE#TRPBF has an undervoltage lockout (UVLO) threshold of 1.67V (rising) and 1.6V (falling), allowing reliable startup from 1.8V input sources such as single-cell alkaline or NiMH batteries. Below 1.6V, the device remains in shutdown with <1µA current draw, protecting the system from brownout instability.
Does the LTC3536EMSE#TRPBF support output voltages lower than 1.8V?
No-the LTC3536EMSE#TRPBF's feedback reference is fixed at 0.6V, and its datasheet-specified output voltage adjust range is strictly 1.8V to 5.5V. Attempting to set VOUT <1.8V violates the guaranteed operating conditions and risks loss of regulation, as the internal error amplifier and MOSFET RDS(ON) characteristics are characterized only within that range.
How does the LTC3536EMSE#TRPBF handle reverse current during power-down sequences?
The LTC3536EMSE#TRPBF actively limits reverse current to ≤0.55A (typical) by disabling PMOS D when reverse conduction is detected. This prevents uncontrolled discharge of downstream capacitors or back-feeding from auxiliary supplies-ensuring safe, controlled power-down in multi-rail systems without external diodes or controllers.
Can the LTC3536EMSE#TRPBF be synchronized to an external clock while operating in Burst Mode?
No-external synchronization via the MODE/SYNC pin is disabled in Burst Mode. The MODE/SYNC pin must be held low (PWM mode) or driven with a clean clock signal (0.3–2MHz, 10–90% duty) for synchronization. In Burst Mode, the oscillator operates autonomously at the programmed or default frequency to maximize light-load efficiency.
What is the recommended inductor value for achieving 1A continuous output at 3.3V with VIN ≥ 3V using the LTC3536EMSE#TRPBF?
The standard design uses a 4.7µH shielded power inductor (e.g., Coilcraft XAL4020-472MEB) rated for ≥2.5A saturation current. This value balances ripple current (<30% of IOUT), efficiency (>92%), and board area-validated in the LTC3536EMSE#TRPBF's Typical Application Circuit (TA01a) and Efficiency vs Load graphs.
LTC3536EMSE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC3536EMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3536EMSE#TRPBF 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#TRPBF reliable?
The price and inventory of LTC3536EMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3536EMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3536EMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3536EMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3536EMSE#TRPBF?
LTC3536EMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3536EMSE#TRPBF 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#TRPBF?
For technical support, including LTC3536EMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3536EMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3536EMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3536EMSE#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3536EMSE#TRPBF?
All LTC3536EMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3536EMSE#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LTC3536EMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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