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Analog Devices Inc. LTC3536IMSE#TRPBF
- Part No.:
- LTC3536IMSE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 12-TSSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC3536IMSE#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 12MSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3536IMSE#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 modes-ideal for RF power supplies and portable medical instrumentation requiring stable regulation when VIN ≈ VOUT or crosses VOUT.
For engineers reviewing the LTC3536IMSE#TRPBF datasheet, LTC3536IMSE#TRPBF pinout, LTC3536IMSE#TRPBF application, or LTC3536IMSE#TRPBF equivalent, key selection criteria include its low-noise buck-boost topology, internal soft-start (0.9ms), output disconnect in shutdown (1µA IQ), thermal protection, and compatibility with 4.7µH inductors and ceramic output capacitors in space-constrained handheld designs.
Technical Context
The LTC3536IMSE#TRPBF implements a proprietary 4-switch synchronous buck-boost architecture with dual N-channel and dual P-channel MOSFETs, enabling continuous regulation across VIN > VOUT (buck), VIN < VOUT (boost), and VIN ≈ VOUT (pass-through) without mode-transition transients. 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 programmable oscillator (RT pin) or external synchronization via MODE/SYNC pin (0.3–2MHz range), supporting noise-sensitive applications. Input current limiting (2.5A typ.) and reverse current limiting (0.55A typ.) operate independently of operating mode, while Burst Mode dynamically disables switching pulses to maintain regulation at light loads with only 32µA IQ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, Li-poly, or 2–3 alkaline/NiMH batteries without pre-regulation. |
| Output Voltage Range | 1.8V to 5.5V - adjustable via FB resistor divider; fixed 3.3V typical in reference designs. |
| Continuous Output Current | 1A @ VIN ≥ 3V, VOUT = 3.3V - limited by thermal performance in 12-pin MSOP package (θJA = 40°C/W). |
| Feedback Voltage | 0.6V ±1% - sets output via VOUT = 0.6V × (1 + RTOP/RBOT); enables precise low-voltage rails. |
| Quiescent Current (Burst) | 32µA - extends battery runtime in standby; user-selectable via MODE/SYNC pin logic level. |
| Shutdown Current | 1µA - ensures near-zero drain during system sleep; achieved with output disconnect. |
| Switching Frequency | 300kHz–2MHz - set by RT resistor or synchronized externally; higher frequencies reduce inductor/capacitor size. |
| Efficiency | Up to 95% - measured at ILOAD = 1A, VIN = 3.3V, VOUT = 3.3V; optimized for mid-load conditions. |
Pinout & Package
The LTC3536IMSE#TRPBF is housed in a thermally enhanced 12-lead plastic MSOP package (3mm × 4mm) with exposed PGND pad (Pin 13) requiring solder connection to PCB ground plane for optimal thermal and electrical performance (θJA = 40°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming input | Resistor-to-GND sets fSW = 100/RT (kΩ); tie to VIN for 1.2MHz default. |
| SGND (Pin 2) | Analog ground reference | Separate Kelvin return for feedback and compensation; isolate from high-current PGND paths. |
| 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) | Power switch node A/B | Connects to one end of buck-boost inductor; carries bidirectional current in all operating modes. |
| SW2 (Pin 6) | Power switch node C/D | Connects to other end of inductor; complements SW1 in 4-switch topology for seamless mode transitions. |
| VOUT (Pin 7) | Regulated output voltage | Delivers up to 1A; requires low-ESR ceramic capacitor (22µF typical) 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 for stability. |
| SHDN (Pin 10) | Enable/disable control | Active-high logic; pulls output to high-Z and disables all switches when low. |
| FB (Pin 11) | Feedback voltage sense | Monitors resistive divider; regulates output to 0.6V on this pin; supports remote sensing. |
| VC (Pin 12) | Error amplifier output | Connects to 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; primary path for switch currents and thermal dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise buck-boost topology | Eliminates subharmonic oscillation and mode-transition glitches-critical for RF transceivers and precision ADCs. |
| Internal soft-start (0.9ms typ.) | Linear ramp of error amplifier reference prevents inrush current; unaffected by output capacitance value. |
| Output disconnect in shutdown | Prevents backfeed from VOUT to VIN; maintains true 1µA shutdown current even with precharged output. |
| Programmable input current limit (2.5A) | Protects against overloads by injecting current into FB pin-preserves regulation during recovery. |
| Reverse current limit (0.55A) | Disables PMOS switch D if load forces current into VOUT-prevents damage during power sequencing. |
| Thermally enhanced MSOP | Exposed PGND pad reduces junction-to-ambient thermal resistance to 40°C/W-enables 1A operation without heatsink. |
Applications
| Wireless Inventory Terminals | Handheld Medical Instruments |
|---|---|
Use Scenario: Battery-powered UHF RFID readers operating from single Li-ion cell (2.7–4.2V) powering 3.3V digital baseband and 5V RF front-end. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining stable 3.3V/5V rails as battery voltage drops below or rises above output targets. Use Value: Seamless VIN–VOUT crossover avoids brownouts during discharge; 32µA Burst Mode extends scan time between charges. | Use Scenario: Portable pulse oximeter with analog front-end (1.8V), microcontroller (3.3V), and OLED display (5V), powered by coin cell or rechargeable Li-poly. IC Role / Device Role / Timing Role: Single-chip multi-rail power solution replacing discrete LDOs and boost converters. Use Value: ±1% output accuracy ensures sensor signal integrity; low-noise operation prevents interference with weak photodiode signals. |
| Wireless Locators & Microphones | Supercapacitor Backup Power Supply |
Use Scenario: Bluetooth LE asset tracker using BLE SoC (1.8–3.6V) and GPS module (3.3V), powered by 2×AA alkalines (1.8–3.2V). IC Role / Device Role / Timing Role: Wide-input buck-boost regulator sustaining regulated 3.3V output across full battery discharge curve. Use Value: 1.8V minimum VIN enables full utilization of battery capacity; 95% peak efficiency minimizes heat in sealed enclosure. | Use Scenario: Real-time clock (RTC) backup supply where supercapacitor (2.7V max) must deliver 3.3V to microcontroller during main power loss. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing charge (VIN→VOUT) and discharge (VOUT→VIN) phases. Use Value: Reverse current limit protects supercapacitor from over-discharge; output disconnect prevents leakage during storage. |
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; no adjustable FB; 2A max output; lower IQ (25µA Burst) but no reverse current limit. | Suitable for cost-sensitive, fixed-output systems; lacks programmability and reverse protection needed for supercapacitor backup. | Select LTC3536IMSE#TRPBF when adjustable output, reverse current protection, or seamless VIN–VOUT crossover is required. |
| MAX77827BEWC+T | Higher integration (I²C control, power-path management); 2.5A output; 1.8–5.5V input; no Burst Mode, higher IQ (60µA). | Better for complex PMIC applications with dynamic voltage scaling; overkill for simple standalone buck-boost needs. | Choose LTC3536IMSE#TRPBF for minimal BOM count, analog-only control, and ultra-low-light-load IQ. |
Compared with TPS63020DSJR and MAX77827BEWC+T, the LTC3536IMSE#TRPBF offers unique combination of adjustable output, integrated reverse current limit, and industry-leading 32µA Burst Mode IQ in a compact MSOP-making it optimal for precision, battery-critical, and multi-mode power architectures.
Availability
LTC3536IMSE#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, long-term lifecycle support, and guaranteed industrial temperature range (–40°C to 125°C).
Supply support for LTC3536IMSE#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 full product continuity, technical documentation, and manufacturing for legacy Linear ICs including the LTC3536 series.
The LTC3536 belongs to Linear's high-efficiency, low-noise DC/DC converter product line, designed specifically for portable and battery-operated systems demanding wide input range, seamless buck-boost operation, and ultra-low quiescent current.
FAQ
What is the maximum continuous output current of the LTC3536IMSE#TRPBF?
The LTC3536IMSE#TRPBF delivers up to 1A continuous output current when VIN ≥ 3V and VOUT = 3.3V, as validated under thermal limits of its 12-pin MSOP package (θJA = 40°C/W). At lower input voltages-e.g., VIN = 1.8V-the maximum continuous output drops to 300mA due to increased inductor current ripple and reduced duty-cycle headroom. Derating curves are provided in the Typical Performance Characteristics section of the LTC3536IMSE#TRPBF datasheet.
Does the LTC3536IMSE#TRPBF support output voltages outside the 1.8V–5.5V range?
No, the LTC3536IMSE#TRPBF is specified and guaranteed only for output voltages between 1.8V and 5.5V, as defined by its feedback reference voltage (0.6V ±1%) and internal switch voltage ratings (–0.3V to 6V absolute max on all pins). Attempting to set VOUT < 1.8V risks violating the minimum FB voltage compliance and may cause regulation failure; VOUT > 5.5V exceeds the absolute maximum rating of the internal MOSFETs and is not supported.
How does the MODE/SYNC pin function in the LTC3536IMSE#TRPBF?
The MODE/SYNC pin on the LTC3536IMSE#TRPBF serves dual functions: logic level selection (0V = PWM mode; VIN = Burst Mode) and external clock synchronization (0.3–2MHz square wave). In PWM mode, the device runs at fixed frequency with lowest output ripple; in Burst Mode, it pulses only as needed to maintain regulation, achieving 32µA quiescent current. When synchronized, the LTC3536IMSE#TRPBF locks to the external clock regardless of RT setting-enabling EMI reduction in noise-sensitive systems.
Can the LTC3536IMSE#TRPBF safely drive a precharged output capacitor?
Yes, the LTC3536IMSE#TRPBF includes start-up logic that detects when VOUT is precharged above ~90% of the target regulation voltage and automatically skips internal soft-start, entering the selected mode (PWM or Burst) immediately. This prevents reverse current flow and potential damage. However, the reverse current limit (0.55A typ.) remains active to protect against forced backfeed from external sources during power sequencing-ensuring safe operation with precharged outputs or stacked power domains.
What thermal considerations apply to the LTC3536IMSE#TRPBF in its MSOP package?
The LTC3536IMSE#TRPBF in the 12-lead MSOP package has a junction-to-ambient thermal resistance (θJA) of 40°C/W when mounted with the exposed PGND pad fully soldered to a 2-layer 1-in² copper area. To sustain 1A continuous output, board layout must minimize thermal impedance: use multiple vias under the exposed pad, connect to inner-layer ground planes, and avoid enclosing the IC in thermally isolated sections. Junction temperature must remain ≤125°C; derating is required above ambient temperatures of ~60°C at full load.
LTC3536IMSE#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
LTC3536IMSE#TRPBF FAQ
1.How can I place an order for LTC3536IMSE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3536IMSE#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 LTC3536IMSE#TRPBF reliable?
The price and inventory of LTC3536IMSE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3536IMSE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3536IMSE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3536IMSE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3536IMSE#TRPBF?
LTC3536IMSE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3536IMSE#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 LTC3536IMSE#TRPBF?
For technical support, including LTC3536IMSE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3536IMSE#TRPBF requirements.
6.How does Aetrix verify that LTC3536IMSE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3536IMSE#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 LTC3536IMSE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3536IMSE#TRPBF?
All LTC3536IMSE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3536IMSE#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 LTC3536IMSE#TRPBF part is unused and in its original packaging.
Return procedure for LTC3536IMSE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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