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Analog Devices Inc. LTC3536IDD#PBF
- Part No.:
- LTC3536IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3536IDD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,977
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Product details
Overview
LTC3536IDD#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter optimized for low-noise, wide-input-range power conversion in portable and RF-sensitive systems. It delivers up to 1A continuous output current with ±1% output voltage accuracy, operates from 1.8V to 5.5V input and output, supports programmable switching frequency from 300kHz to 2MHz, and features Burst Mode operation with 32µA quiescent current - enabling long battery life in handheld medical instruments and wireless locators.
For engineers reviewing the LTC3536IDD#PBF datasheet, LTC3536IDD#PBF pinout, LTC3536IDD#PBF application, or LTC3536IDD#PBF equivalent, key selection considerations include its seamless buck/boost/buck-boost mode transitions, internal soft-start (0.9ms), reverse current limiting (0.55A), 1µA shutdown current, and compatibility with 3mm × 3mm DFN-10 packaging for space-constrained designs.
Technical Context
The LTC3536IDD#PBF implements a proprietary 4-switch synchronous topology with two P-channel and two N-channel MOSFETs, enabling regulation when VIN is above, below, or equal to VOUT without external diodes or complex control logic. Its voltage-mode error amplifier (90dB gain) drives an internal PWM modulator with programmable oscillator and external synchronization capability via MODE/SYNC pin.
It integrates dual current-limit protection: a 2.5A input current limit (active feedback injection into FB pin) and a 3.4A peak switch current limit, plus reverse current limiting (0.55A) to prevent damage during output precharge or supply back-driving. Thermal shutdown and undervoltage lockout (1.67V rising threshold) ensure robust operation across –40°C to 125°C junction temperature range.
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 Range | 1.8V to 5.5V - adjustable via external resistor divider on FB pin; 0.6V reference enables precise regulation. |
| Continuous Output Current | 1A at VIN ≥ 3V, VOUT = 3.3V - sufficient for RF transceivers, microcontrollers, and sensor subsystems. |
| Switching Frequency | 300kHz–2MHz (programmable via RT resistor) - balances PCB area (smaller inductors/caps) vs. efficiency/noise. |
| Quiescent Current | 32µA in Burst Mode - extends battery runtime in standby; drops to 1µA in shutdown. |
| Output Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable supply for precision ADCs, PLLs, and analog front-ends. |
| Package | 10-pin (3mm × 3mm) DFN with exposed PGND pad - thermally enhanced for 1A operation in compact layouts. |
Pinout & Package
The LTC3536IDD#PBF is housed in a 10-lead (3mm × 3mm) plastic DFN package with exposed thermal pad (Pin 11 = PGND). The exposed pad must be soldered to PCB ground for thermal performance and load regulation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| RT (Pin 1) | Oscillator frequency programming input | Connect resistor to GND to set fSW = 100/RT (kΩ); tie to VIN for default 1.2MHz operation. |
| SGND (Pin 2) | Analog ground reference | Separate Kelvin connection point for feedback and compensation components; isolate from high-current PGND paths. |
| MODE/SYNC (Pin 3) | Operation mode control & clock sync input | Logic 0 = fixed-frequency PWM; Logic 1 = Burst Mode; external clock >1.2V synchronizes oscillator. |
| SW1 (Pin 4) | Switch node A/B connection | Connects to one end of buck-boost inductor; carries bidirectional current in all operating modes. |
| SW2 (Pin 5) | Switch node C/D connection | Connects to other end of buck-boost inductor; complements SW1 in 4-switch power stage. |
| VOUT (Pin 6) | Regulated power output | Delivers up to 1A; requires low-ESR ceramic capacitor placed adjacent to pin with short ground return path. |
| VIN (Pin 7) | Main power input | Accepts 1.8V–5.5V; bypass with ≥10µF low-ESR capacitor close to pin to suppress input ripple and noise. |
| SHDN (Pin 8) | Enable/disable control | Logic high enables regulator; logic low reduces supply current to ≤1µA and disconnects output. |
| FB (Pin 9) | Feedback voltage sensing input | Senses resistive divider output; regulates VOUT = 0.6V × (1 + RTOP/RBOT) with ±1% accuracy. |
| VC (Pin 10) | Error amplifier output | Connect Type III compensation network (RFF, CFF, CPOLE, CFB) between VC and FB for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless buck/boost/buck-boost transition | Eliminates output transients and subharmonics during VIN crossing VOUT - critical for RF and measurement systems. |
| Internal soft-start (0.9ms typical) | Linearly ramps reference voltage to limit inrush current; unaffected by output capacitance or VOUT setting. |
| Reverse current limiting (0.55A typical) | Turns off PMOS switch D when reverse current exceeds threshold - protects against back-driving during power sequencing. |
| Programmable input current limit (2.5A typical) | Injects proportional current into FB pin to reduce duty cycle - maintains regulation under overload without latch-off. |
| Thermally enhanced DFN-10 package | θJA = 39.7°C/W with proper PCB copper pour - sustains 1A output at full temperature range without derating. |
Applications
| Wireless Inventory Terminals | Handheld Medical Instruments |
|---|---|
Use Scenario: Portable barcode scanners powered by single-cell Li-ion batteries with varying voltage (3.0–4.2V) while requiring stable 3.3V for MCU and radio. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining regulated 3.3V output as battery discharges below and rises above target voltage. Use Value: Eliminates need for separate buck and boost stages; 32µA Burst Mode IQ extends scan time per charge by >30% versus PWM-only solutions. |
Use Scenario: Battery-powered pulse oximeters with analog front-end (AFE), ADC, and Bluetooth LE radio sharing a common 3.3V rail. IC Role / Device Role / Timing Role: Low-noise power source delivering clean 3.3V with <10mVpp ripple in PWM mode to avoid interference with weak optical signal processing. Use Value: Proprietary 4-switch architecture achieves >95% efficiency at 1A and <20µVRMS output noise - meets IEC 60601 EMI requirements without additional filtering. |
| Wireless Locators & Microphones | Supercapacitor Backup Power Supply |
Use Scenario: Ultra-low-power asset trackers using BLE beaconing intermittently, spending >99% of time in deep sleep with 1.8V–2.5V supercapacitor input. IC Role / Device Role / Timing Role: Efficient step-up converter generating 3.3V from decaying supercap voltage down to 1.8V. Use Value: 1µA shutdown current and 32µA Burst Mode enable >1-year shelf life; 0.3A reverse current limit prevents supercap discharge during main supply presence. |
Use Scenario: Industrial controllers with real-time clock (RTC) and SRAM retention requiring uninterrupted 3.3V during AC mains failure, backed by 5.5V supercapacitor. IC Role / Device Role / Timing Role: Bidirectional buck-boost managing energy flow from supercap to 3.3V rail during outage, and recharging supercap when mains returns. Use Value: Seamless VIN = VOUT operation avoids dead zones; output disconnect in shutdown prevents supercap self-discharge through 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/5V output options only; no adjustable FB; 2.5A max output; higher 25µA IQ in FPWM mode but no Burst Mode equivalent. | Best suited for cost-sensitive, fixed-output consumer devices where layout simplicity outweighs adjustability. | Select TPS63020DSJR only if output voltage is fixed and system-level noise immunity is less critical than BOM count reduction. |
| MAX77827BEWC+T | Higher 2.5A output; integrated I2C interface for dynamic voltage scaling; 1.2µA shutdown current; requires external compensation. | Ideal for multi-rail PMIC systems needing programmable sequencing and telemetry, not standalone low-noise conversion. | Choose MAX77827BEWC+T when digital control, telemetry, or multiple regulated outputs are required - not for analog/RF-critical single-rail use. |
Compared with TPS63020DSJR and MAX77827BEWC+T, the LTC3536IDD#PBF uniquely combines adjustable output, ultra-low 32µA Burst Mode IQ, seamless mode transitions, and proven low-noise performance - making it the preferred choice for RF, precision analog, and long-life battery applications where parameter flexibility and signal integrity are non-negotiable.
Availability
LTC3536IDD#PBF is available at Aetrix Electronics and suitable for wireless inventory terminals, handheld medical instruments, and supercapacitor backup power supplies requiring stable component supply, extended temperature support (–40°C to 125°C), and lead-free compliance.
Supply support for LTC3536IDD#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 continues its legacy of high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The LTC3536IDD#PBF belongs to Linear's precision buck-boost converter product line, engineered specifically for noise-sensitive, wide-input-range applications where seamless regulation across VIN/VOUT crossover is essential - such as portable instrumentation and RF subsystems.
FAQ
What is the maximum continuous output current supported by the LTC3536IDD#PBF?
The LTC3536IDD#PBF delivers up to 1A continuous output current when VIN ≥ 3V and VOUT = 3.3V, as confirmed in the Electrical Characteristics table and Typical Performance curves. At lower input voltages - e.g., VIN = 1.8V - output current capability drops to ~300mA due to increased inductor current ripple and reduced duty-cycle headroom. Derating is necessary above 85°C ambient per thermal data in the DFN-10 package section.
Does the LTC3536IDD#PBF support output voltage adjustment, and what is the reference voltage?
Yes, the LTC3536IDD#PBF supports fully adjustable output voltage from 1.8V to 5.5V using an external resistor divider on the FB pin. Its internal reference voltage is 0.6V (±1% over –40°C to 125°C), enabling precise regulation via VOUT = 0.6V × (1 + RTOP/RBOT). This design allows flexible rail generation without requiring multiple fixed-output variants.
How does Burst Mode operation improve efficiency in the LTC3536IDD#PBF?
Burst Mode operation in the LTC3536IDD#PBF reduces no-load quiescent current to 32µA by disabling switching until output voltage droop triggers a burst of energy pulses. This eliminates switching losses at light loads, significantly extending battery life in standby - especially critical for wireless sensors and portable diagnostics. Unlike forced-PWM, Burst Mode dynamically adapts to load, maintaining regulation while minimizing average current draw.
What thermal considerations apply to the LTC3536IDD#PBF in its DFN-10 package?
The LTC3536IDD#PBF in the 10-pin DFN package has θJA = 39.7°C/W when the exposed PGND pad (Pin 11) is properly soldered to a minimum 100mm² copper pour. To sustain 1A output at 125°C junction temperature, ambient must remain ≤85°C with adequate airflow or board-level heatsinking. Thermal shutdown activates at TJ = 125°C and automatically recovers once temperature falls below 110°C.
Can the LTC3536IDD#PBF be synchronized to an external clock, and what are the requirements?
Yes, the LTC3536IDD#PBF supports external synchronization via the MODE/SYNC pin. The external clock must have amplitude ≥1.2V (high) and ≤0.4V (low), duty cycle between 10% and 90%, and frequency between 300kHz and 2MHz. Synchronization overrides the internal oscillator - whether set by RT resistor or VIN tie - allowing EMI reduction through frequency alignment with system clocks or noise-sensitive bands.
LTC3536IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
LTC3536IDD#PBF FAQ
1.How can I place an order for LTC3536IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3536IDD#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 LTC3536IDD#PBF reliable?
The price and inventory of LTC3536IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3536IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3536IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3536IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3536IDD#PBF?
LTC3536IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3536IDD#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 LTC3536IDD#PBF?
For technical support, including LTC3536IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3536IDD#PBF requirements.
6.How does Aetrix verify that LTC3536IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3536IDD#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 LTC3536IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3536IDD#PBF?
All LTC3536IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3536IDD#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 LTC3536IDD#PBF part is unused and in its original packaging.
Return procedure for LTC3536IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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