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Analog Devices Inc. LTC3531EDD#PBF
- Part No.:
- LTC3531EDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3531EDD#PBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
LTC3531EDD#PBF from Analog Devices (formerly Linear Technology) is a synchronous 4-switch buck-boost DC/DC converter in a 3mm × 3mm DFN package, supporting input voltages from 1.8V to 5.5V and delivering up to 200mA at adjustable output voltages from 2V to 5V. It features Burst Mode® operation, 16μA quiescent current, and integrated 0.5Ω NMOS and 0.5Ω/0.8Ω PMOS switches - ideal for single-cell Li-ion or multi-cell alkaline-powered portable instrumentation.
For engineers reviewing the LTC3531EDD#PBF datasheet, LTC3531EDD#PBF pinout, LTC3531EDD#PBF application, or LTC3531EDD#PBF equivalent, key selection criteria include its seamless mode transition (buck/boost/4SW), output disconnect in shutdown, <1μA shutdown current, and minimal external component count (only three passive parts required for fixed-output designs).
Technical Context
The LTC3531EDD#PBF implements a true 4-switch synchronous topology with automatic mode detection based on VIN–VOUT differential, enabling continuous regulation across input voltages both above and below the output setpoint. Its state machine dynamically selects between buck, boost, and 4-switch modes using IPEAK (365mA typ), IVALLEY, and IZERO sensing - eliminating discontinuous conduction and minimizing output ripple.
Burst Mode® control maintains high efficiency (>80% at 100μA load) by disabling switching when VOUT exceeds the 1.225V internal reference, drawing only 16μA quiescent current. The FB pin enables precise output adjustment via resistor divider, while SHDN provides logic-level shutdown with 60mV hysteresis and <1μA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 1.8V to 5.5V - supports single Li-ion (3.1–4.2V), two AA alkaline (1.8–3.2V), or USB 5V inputs without external LDO pre-regulation. |
| VOUT Range | 2.0V to 5.0V (adjustable via FB pin) - enables flexible rail generation for mixed-voltage SoCs, sensors, or RF front-ends. |
| Max Output Current | 200mA at 3.3V - sufficient for microcontrollers, display drivers, and low-power wireless transceivers in space-constrained designs. |
| Quiescent Current | 16μA typical - extends battery life in always-on sensor nodes and wearable devices operating at microamp loads. |
| Switch RDS(ON) | NMOS: 0.5Ω; PMOS A/D: 0.5Ω/0.8Ω - minimizes conduction loss and enables >90% peak efficiency at medium loads. |
| Shutdown Current | <1μA - ensures zero-load battery drain during system sleep, critical for long-term remote deployments. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin applications without derating. |
Pinout & Package
The LTC3531EDD#PBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed thermal pad (Pin 9, GND). The package requires soldering the exposed pad to PCB ground for optimal thermal performance (θJA = 43°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW1 (Pin 1) | Buck-boost switch node A/B connection | Connects to one end of power inductor; carries full switching current in all modes - requires low-inductance layout. |
| VIN (Pin 2) | Input supply rail | Accepts 1.8–5.5V input; requires ≥2.2μF ceramic capacitor placed adjacent to pin for high-frequency decoupling. |
| GND (Pin 3) | Signal ground reference | Provides analog reference for feedback comparator and internal logic; must be tied to PGND at single point. |
| SHDN (Pin 4) | Enable/disable control input | Logic-high (>1.4V) enables operation; logic-low (<0.4V) initiates full output disconnect and sub-1μA shutdown. |
| FB (Pin 5) | Feedback voltage sense | Monitors resistor divider output; sets VOUT = 1.225V × (1 + R1/R2); input bias current ≤50nA enables high-impedance dividers. |
| VOUT (Pin 6) | Regulated output rail | Delivers up to 200mA; requires 4.7–22μF ceramic output capacitor close to pin for stability and low ripple. |
| PGND (Pin 8) | Power ground return | Carries high di/dt switch currents; must be connected to GND plane via multiple vias under exposed pad. |
| Exposed Pad (Pin 9) | Thermal and electrical ground | Must be soldered to solid PCB ground plane - primary path for heat dissipation and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic 4-switch mode transition | Seamlessly shifts between buck, boost, and 4SW operation without output glitch or manual configuration - eliminates mode-boundary instability. |
| Output disconnect in shutdown | Opens both P-channel rectifiers to isolate VOUT from input, preventing backfeed and enabling true zero-VOUT standby states. |
| No external compensation required | Internal compensation network enables stable operation with only three external components - reduces BOM count and layout sensitivity. |
| Integrated current limiting & thermal shutdown | 365mA peak current limit and 150°C thermal cutoff protect against short-circuit and overload conditions without external circuitry. |
| Low-noise Burst Mode® operation | Maintains <20mVpp output ripple at light loads while achieving >85% efficiency down to 100μA - suitable for noise-sensitive analog circuits. |
Applications
| Portable Medical Sensors | USB-Powered IoT Edge Nodes |
|---|---|
Use Scenario: Continuous glucose monitor powered by CR2032 coin cell (2.0–3.0V) requiring stable 3.3V for MCU and BLE radio. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining regulated 3.3V output as battery discharges from 3.0V to 2.0V - operates in 4SW mode throughout discharge curve. Use Value: 16μA quiescent current extends battery life beyond 1 year; output disconnect prevents sensor self-discharge during sleep. |
Use Scenario: Smart environmental sensor node drawing power from USB host (4.75–5.25V) while generating 3.3V for ESP32 and 2.8V for MEMS microphone. IC Role / Device Role / Timing Role: Adjustable buck-boost converter configured for 3.3V output, accepting wide-input USB supply without linear dropout or efficiency penalty. Use Value: 90% peak efficiency at 100mA eliminates need for heatsinking; Burst Mode® maintains >80% efficiency at 50μA idle current. |
| Handheld Test Instruments | Industrial Hand Scanners |
Use Scenario: Battery-operated multimeter using two AA alkaline cells (1.8–3.2V) to power 3.0V LCD display and 3.3V microcontroller. IC Role / Device Role / Timing Role: Fixed 3.0V version (LTC3531EDD-3) regulating output across full battery range - transitions from boost to 4SW to buck as VIN rises. Use Value: Single-inductor architecture reduces solution size vs. SEPIC; ThinSOT/DFN packages enable compact 2-layer PCB layouts. |
Use Scenario: Rugged barcode scanner powered by 3.7V Li-ion pack, requiring 5.0V for laser diode driver and 3.3V for image sensor interface. IC Role / Device Role / Timing Role: Adjustable LTC3531EDD#PBF configured for 5.0V output, delivering 200mA with <10mVpp ripple under dynamic load steps. Use Value: Integrated 0.5Ω NMOS/0.8Ω PMOS switches eliminate discrete FETs; thermal pad enables 1.2W dissipation in sealed enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3440EDD#PBF | Fixed 5.5V output only; no adjustable version; higher IQ (25μA); requires external compensation. | Suitable only for 5.5V systems; lacks flexibility for multi-rail designs requiring 3.3V or lower outputs. | Select LTC3531EDD#PBF when adjustable output, lower quiescent current, or simplified design (no compensation) is required. |
| LTC3458EDD#PBF | Step-up only (boost); 1.4A output; 1.5MHz switching; supports up to 7.5V output. | Cannot regulate when VIN > VOUT; unsuitable for Li-ion applications where input may exceed output voltage. | Choose LTC3531EDD#PBF for true buck-boost capability across VIN/VOUT crossover - essential for single-cell battery systems. |
Compared with LTC3440EDD#PBF and LTC3458EDD#PBF, the LTC3531EDD#PBF uniquely combines adjustable output, ultra-low quiescent current, and seamless buck-boost operation in a thermally optimized DFN package - making it the optimal choice for battery-powered systems with variable input voltage.
Availability
LTC3531EDD#PBF is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered IoT edge nodes, handheld test instruments, and industrial hand scanners requiring stable component supply and long-lifecycle support.
Supply support for LTC3531EDD#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 to manufacture and support its precision analog and power management portfolio with full datasheet compliance and long-term product assurance.
The LTC3531EDD#PBF belongs to Linear's high-efficiency synchronous buck-boost converter family, designed specifically for space-constrained, battery-powered applications demanding wide input range, low quiescent current, and seamless mode transition.
FAQ
What is the minimum startup voltage for the LTC3531EDD#PBF?
The LTC3531EDD#PBF has a minimum startup voltage of 1.65V (typical) and 1.8V (guaranteed), allowing reliable operation from deeply discharged single-cell Li-ion or two-cell alkaline batteries. This threshold is enforced by internal UVLO circuitry that prevents erratic behavior during cold-start conditions. The LTC3531EDD#PBF remains functional down to 1.65V, enabling extended runtime in energy-harvesting and low-power sensor applications.
Does the LTC3531EDD#PBF support true output disconnect during shutdown?
Yes, the LTC3531EDD#PBF provides true output disconnect by opening both P-channel MOSFET rectifiers when SHDN is pulled low, isolating VOUT from VIN and allowing the output rail to discharge fully. This feature prevents backfeed into the input source and eliminates standby current draw from downstream circuitry. The LTC3531EDD#PBF achieves <1μA shutdown current while maintaining this isolation - critical for battery-backed systems.
Can the LTC3531EDD#PBF be used with a 10μH inductor and 10μF output capacitor?
Yes, the LTC3531EDD#PBF is validated for use with a 10μH inductor and 10μF ceramic output capacitor, as shown in typical application circuits (e.g., Figure TA04a). This combination delivers stable regulation, <20mVpp ripple at 200mA load, and optimal transient response. The LTC3531EDD#PBF's internal compensation eliminates the need for external loop compensation components when using these standard values.
What is the peak switch current limit of the LTC3531EDD#PBF?
The LTC3531EDD#PBF features a programmable peak current limit of 295mA (min), 365mA (typical), and 460mA (max) - measured at VIN = 5V with L = 10μH. This limit protects the internal MOSFETs during overload or short-circuit events and scales with input voltage. The LTC3531EDD#PBF maintains consistent current limiting across temperature (-40°C to +85°C) without external sensing resistors.
Is the exposed thermal pad on the LTC3531EDD#PBF electrically connected to ground?
Yes, the exposed pad (Pin 9) on the LTC3531EDD#PBF is internally connected to GND and must be soldered to the PCB ground plane for both electrical functionality and thermal performance. Failure to connect the pad results in degraded efficiency, elevated junction temperature (>125°C), and potential thermal shutdown. The LTC3531EDD#PBF's θJA drops from 102°C/W (TSOT) to 43°C/W (DFN with pad soldered), confirming its critical role in heat dissipation.
LTC3531EDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-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):
- 2V
- Voltage - Output (Max):
- 5V
- Current - Output:
- 200mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LTC3531EDD#PBF FAQ
1.How can I place an order for LTC3531EDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531EDD#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 LTC3531EDD#PBF reliable?
The price and inventory of LTC3531EDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531EDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC3531EDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531EDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531EDD#PBF?
LTC3531EDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531EDD#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 LTC3531EDD#PBF?
For technical support, including LTC3531EDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531EDD#PBF requirements.
6.How does Aetrix verify that LTC3531EDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3531EDD#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 LTC3531EDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC3531EDD#PBF?
All LTC3531EDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531EDD#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 LTC3531EDD#PBF part is unused and in its original packaging.
Return procedure for LTC3531EDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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