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Analog Devices Inc. LTC3536EDD#PBF
- Part No.:
- LTC3536EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC3536EDD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 1A 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:374
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Product details
Overview
LTC3536EDD#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter delivering up to 1A continuous output current with ±1% output voltage accuracy, 1.8V–5.5V input/output range, and programmable 300kHz–2MHz switching frequency. It operates seamlessly across buck, boost, and buck-boost modes-ideal for RF power supplies and precision handheld medical instruments where input voltage may dip below or rise above the regulated output.
For engineers reviewing the LTC3536EDD#PBF datasheet, LTC3536EDD#PBF pinout, LTC3536EDD#PBF application, or LTC3536EDD#PBF equivalent, key selection criteria include its low-noise architecture, 32µA Burst Mode quiescent current, internal soft-start, output disconnect in shutdown, and compatibility with 3mm × 3mm DFN packaging for space-constrained portable designs.
Technical Context
The LTC3536EDD#PBF implements a proprietary 4-switch topology with two N-channel and two P-channel MOSFETs, enabling continuous regulation when VIN is above, below, or equal to VOUT without mode-transition transients. Its voltage-mode control loop uses an internal error amplifier with Type III compensation via VC/FB pins and supports both fixed-frequency PWM and variable-frequency Burst Mode operation.
Switching frequency is set by an external resistor on RT (300kHz–2MHz) or defaults to 1.2MHz when RT is tied to VIN; the MODE/SYNC pin selects operating mode (PWM vs. Burst) and accepts external clock synchronization up to 2MHz. Input current limiting (2.5A typ.) and reverse current protection (0.55A typ.) are implemented via feedback pin injection and dedicated comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, and supercapacitor inputs without pre-regulation. |
| Output Voltage Range | 1.8V to 5.5V - adjustable via FB resistive divider; 0.6V reference enables precise regulation. |
| Continuous Output Current | 1A at VIN ≥ 3V, VOUT = 3.3V - limited by thermal performance in 10-pin DFN package. |
| Quiescent Current | 32µA in Burst Mode - extends battery life in standby; drops to 1µA in shutdown. |
| Switching Frequency | 300kHz–2MHz - programmable via RT resistor; synchronizable to external clock for EMI reduction. |
| Output Voltage Accuracy | ±1% over –40°C to 125°C - ensures stable rail for ADC references and RF front-ends. |
| Package | 10-pin (3mm × 3mm) DFN - thermally enhanced with exposed PGND pad for efficient heat dissipation. |
Pinout & Package
The LTC3536EDD#PBF is housed in a 10-pin (3mm × 3mm) plastic DFN package with exposed PGND pad (Pin 11), requiring soldering to PCB ground plane for thermal and electrical integrity. Pin pitch is 0.5mm.
| 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 | Kelvin connection point for feedback and compensation; separate from high-current PGND. |
| MODE/SYNC (Pin 3) | Mode selection & sync input | Logic low = PWM; logic high = Burst Mode; external clock input for synchronization. |
| SW1 (Pin 4) | Switch node A/B | Connects to one end of buck-boost inductor; ties internal P-MOS A and N-MOS B. |
| SW2 (Pin 5) | Switch node C/D | Connects to other end of buck-boost inductor; ties internal N-MOS C and P-MOS D. |
| VOUT (Pin 6) | Regulated output voltage | Power output terminal; requires low-ESR ceramic capacitor placed adjacent to pin. |
| VIN (Pin 7) | Input power supply | Accepts 1.8V–5.5V; bypassed with ≥10µF low-ESR capacitor near pin. |
| SHDN (Pin 8) | Enable/disable control | Logic high = active; logic low = shutdown with 1µA supply current and output disconnect. |
| FB (Pin 9) | Feedback voltage sense | 0.6V reference input; programs VOUT = 0.6V × (1 + RTOP/RBOT) for 1.8V–5.5V range. |
| VC (Pin 10) | Error amplifier output | Compensation node for Type III network (RFF, CFF, CPOLE, CFB) to stabilize control loop. |
| PGND (Pin 11, Exposed Pad) | Power ground return | Must be soldered to large PCB ground plane; primary thermal path and high-current return. |
Key Features
| Feature | Design Value |
|---|---|
| 4-switch buck-boost topology | Enables seamless VIN-above/VIN-below-VOUT operation without external diodes or mode-switching artifacts. |
| Burst Mode® operation | Reduces no-load IQ to 32µA while maintaining regulation-critical for battery runtime in intermittent-use devices. |
| Programmable 300kHz–2MHz fSW | Allows optimization of inductor size (smaller at higher fSW) and efficiency (higher at lower fSW). |
| Internal 1ms soft-start | Linear ramp of error amplifier reference prevents inrush current and output overshoot during startup. |
| Output disconnect in shutdown | Prevents backfeed from VOUT to VIN-essential for systems with multiple power domains or backup sources. |
Applications
| Wireless Inventory Terminals | Handheld Medical Instruments |
|---|---|
Use Scenario: Portable barcode scanners powered by single-cell Li-ion (2.7V–4.2V) supplying stable 3.3V to MCU and RF transceiver. IC Role / Device Role / Timing Role: Primary buck-boost regulator maintaining 3.3V output as battery discharges below 3.3V and charges above it. Use Value: Eliminates need for separate buck and boost stages; ±1% accuracy ensures reliable ADC sampling and BLE radio performance. | Use Scenario: Battery-powered pulse oximeter with analog front-end requiring ultra-low-noise 2.5V rail. IC Role / Device Role / Timing Role: Low-noise power source for precision op-amps and ADCs; operates in PWM mode to minimize output ripple. Use Value: 95% peak efficiency and <10mVPP ripple in PWM mode enable clinical-grade signal fidelity. |
| Wireless Locators/Microphones | Supercapacitor Backup Power Supply |
Use Scenario: UWB-based indoor positioning tag using supercapacitor storage and 3.3V system rail. IC Role / Device Role / Timing Role: Bidirectional voltage regulator that boosts supercapacitor voltage (0.8V–2.7V) to 3.3V while supporting reverse current limiting. Use Value: Reverse current limit (0.55A) prevents damage during capacitor recharge; Burst Mode extends standby time to weeks. | Use Scenario: Real-time clock (RTC) backup circuit where main 3.3V rail fails and supercapacitor (1.8V–5.5V) takes over. IC Role / Device Role / Timing Role: Maintains regulated 3.3V output from decaying supercapacitor voltage without interruption. Use Value: Seamless transition between main and backup sources; 1µA shutdown current minimizes capacitor self-discharge. |
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; 2.5V–6V input range | Suitable for fixed-rail systems only; lacks VOUT adjustability and reverse current limit | Select when output voltage is fixed and higher current is required; not suitable for programmable or bidirectional backup use cases. |
| MAX77827AEWE+T | 3.2V–5.5V input; 1.8V–5.2V output; 1.2A max; integrated load switch; no Burst Mode | Includes integrated load switch but higher 45µA no-load IQ; no synchronization capability | Choose when integrated load switch is needed and EMI-sensitive sync is unnecessary; less optimal for ultra-low-IQ battery apps. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the LTC3536EDD#PBF uniquely combines adjustable output, true bidirectional operation, 32µA Burst Mode IQ, and external clock synchronization-making it the preferred choice for noise-sensitive, battery-critical, and dynamically varying input applications.
Availability
LTC3536EDD#PBF 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 LTC3536EDD#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 legacy of high-performance power management ICs with rigorous characterization and automotive-grade reliability testing.
The LTC3536EDD#PBF belongs to Linear's precision buck-boost regulator product line, designed specifically for portable and RF-critical applications demanding seamless VIN/VOUT crossover, ultra-low quiescent current, and minimal output noise.
FAQ
What is the maximum continuous output current of the LTC3536EDD#PBF?
The LTC3536EDD#PBF delivers up to 1A continuous output current when VIN ≥ 3V and VOUT = 3.3V, as specified in the Electrical Characteristics table. At lower input voltages-such as VIN = 1.8V-the maximum continuous output current drops to 300mA due to increased conduction losses and reduced duty-cycle headroom. Thermal performance in the 10-pin DFN package limits sustained current under high ambient temperatures or poor PCB copper area.
Does the LTC3536EDD#PBF support output voltage adjustment?
Yes, the LTC3536EDD#PBF supports fully adjustable output voltage from 1.8V to 5.5V using an external resistive divider connected to the FB pin. The internal 0.6V reference enables precise calculation: VOUT = 0.6V × (1 + RTOP/RBOT). This flexibility allows the LTC3536EDD#PBF to replace multiple fixed-output regulators in multi-rail systems while maintaining ±1% accuracy across temperature.
How does Burst Mode® operation reduce power consumption in the LTC3536EDD#PBF?
Burst Mode® operation in the LTC3536EDD#PBF reduces no-load quiescent current to 32µA by disabling switching until output voltage droop triggers a burst of energy transfer. Unlike pulse-skipping, this method maintains regulation while minimizing gate drive and switching losses. The LTC3536EDD#PBF enters Burst Mode when MODE/SYNC is pulled high, making it ideal for battery-powered devices with intermittent active periods-extending shelf life significantly compared to standard PWM operation.
Can the LTC3536EDD#PBF be synchronized to an external clock?
Yes, the LTC3536EDD#PBF supports external clock synchronization via the MODE/SYNC pin. When driven with a clean square wave (1.2V–6V amplitude, 10%–90% duty cycle), the internal oscillator locks to the external frequency within 0.3MHz–2MHz range. This capability allows designers to eliminate beat frequencies in multi-converter systems and meet strict EMI compliance requirements-without requiring additional timing components beyond the sync source.
What thermal considerations apply to the LTC3536EDD#PBF in its DFN package?
The LTC3536EDD#PBF in the 10-pin (3mm × 3mm) DFN package has θJA = 39.7°C/W and requires the exposed PGND pad (Pin 11) to be soldered to a minimum 100mm² copper area for rated thermal performance. Junction temperature must remain ≤125°C; at 1A load and 3.3V I/O, board layout-including inductor placement, ground plane continuity, and airflow-directly impacts achievable output current. Derating is recommended above 60°C ambient unless enhanced cooling is implemented.
LTC3536EDD#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)
LTC3536EDD#PBF FAQ
1.How can I place an order for LTC3536EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3536EDD#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 LTC3536EDD#PBF reliable?
The price and inventory of LTC3536EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3536EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3536EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3536EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3536EDD#PBF?
LTC3536EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3536EDD#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 LTC3536EDD#PBF?
For technical support, including LTC3536EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3536EDD#PBF requirements.
6.How does Aetrix verify that LTC3536EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3536EDD#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 LTC3536EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3536EDD#PBF?
All LTC3536EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3536EDD#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 LTC3536EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3536EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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