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Analog Devices Inc. LTC3531EDD#TRPBF
- Part No.:
- LTC3531EDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LTC3531EDD#TRPBF.pdf
- Description:
- IC REG BUCK BOOST ADJ 200MA 8DFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LTC3531EDD#TRPBF 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 3.3V output. It features Burst Mode® operation, 16μA quiescent current, and automatic seamless mode transition between buck, boost, and 4-switch modes-ideal for single-cell Li-Ion or multi-cell alkaline/nickel-powered handheld instruments and portable audio devices.
For engineers reviewing the LTC3531EDD#TRPBF datasheet, LTC3531EDD#TRPBF pinout, LTC3531EDD#TRPBF application, or LTC3531EDD#TRPBF equivalent, key selection criteria include its wide VIN–VOUT overlap capability, ultra-low IQ for battery life extension, integrated 0.5Ω NMOS and 0.5Ω/0.8Ω PMOS switches, output disconnect in shutdown, and fixed 3.3V output without external feedback resistors.
Technical Context
The LTC3531EDD#TRPBF implements a true 4-switch synchronous topology with independent control of four internal MOSFETs (A/B/C/D), enabling continuous conduction across buck, boost, and 4-switch modes without discontinuity. Its VBEST comparator dynamically selects optimal switching pairs based on real-time VIN–VOUT differential, while IPEAK (365mA typ), IVALLEY, and IZERO detection govern current-mode regulation.
Burst Mode® operation eliminates external compensation and reduces sleep current to 16μA by gating switching cycles only when VOUT drops below a 1.225V reference with ~1% hysteresis. The device integrates anticross-conduction logic, thermal shutdown (~150°C), and <1μA shutdown current, with all critical functions validated over –40°C to 85°C.
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 | Fixed 3.3V ±1.2% (3.25V–3.39V) - tightly regulated output eliminates need for external feedback divider in standard applications. |
| Max Output Current | 200mA at 3.3V from 3.6V input - sufficient for powering microcontrollers, RF transceivers, and sensor interfaces in space-constrained designs. |
| Quiescent Current | 16μA typical - enables >1-year battery life in always-on monitoring devices using 200mAh coin cells. |
| Efficiency | Up to 90% at 100mA load - achieved via synchronous rectification and low-RDS(ON) switches (0.5Ω NMOS, 0.5Ω/0.8Ω PMOS). |
| Shutdown Current | <1μA - ensures zero-load battery drain during system sleep, critical for remote IoT endpoints. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive cabin-temperature environments without derating. |
Pinout & Package
Package: 8-lead 3mm × 3mm plastic DFN with exposed thermal pad (Pin 9, GND). Requires soldering of exposed pad to PCB ground plane for 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; internal NMOS A and PMOS B tied here-must minimize trace inductance for EMI control. |
| VIN (Pin 2) | Input supply rail | Accepts 1.8–5.5V; requires ≥2.2μF ceramic capacitor placed adjacent to pin to suppress high-frequency switching noise. |
| GND (Pin 3) | Signal ground reference | Reference for internal comparators and logic; must be star-connected to PGND near IC to avoid ground bounce. |
| SHDN (Pin 4) | Enable/disable control input | Active-high: <0.4V = shutdown (output disconnect), >1.4V = active; hysteresis = 60mV prevents chatter near threshold. |
| FB (Pin 5) | Feedback input | Not bonded in LTC3531EDD#TRPBF (fixed 3.3V version); left unconnected per datasheet-no external resistor divider needed. |
| VOUT (Pin 6) | Regulated output rail | Delivers 3.3V ±1.2%; requires 4.7–22μF ceramic output capacitor close to pin for ripple suppression and load transient response. |
| PGND (Pin 8) | Power ground return | High-current return path for internal switches; must be low-impedance copper pour connected directly to exposed pad. |
| SW2 (Pin 7) | Buck-boost switch node C/D connection | Connects to other end of inductor; internal NMOS C and PMOS D tied here-optional Schottky diode to VOUT improves light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Seamless 4-switch operation | Automatically transitions between buck, boost, and 4-switch modes as VIN varies relative to VOUT-no mode-control pins or firmware required. |
| Output disconnect in shutdown | Opens both PMOS rectifiers to isolate VOUT from VIN, allowing VOUT to fully discharge-essential for safe hot-swap and system reset sequencing. |
| No external compensation | Burst Mode® architecture eliminates need for loop compensation components, reducing BOM count and layout sensitivity. |
| Thermal shutdown protection | Triggers at ~150°C junction temperature and auto-recovers after 10°C hysteresis-prevents permanent damage during overload or poor heatsinking. |
| Only 3 external components | Requires just one inductor and two capacitors (CIN, COUT) for full functionality-minimizes solution footprint to <15mm² total area. |
Applications
| Handheld Instruments | MP3 Players |
|---|---|
Use Scenario: Portable multimeter powered by two AA alkaline cells (1.8–3.2V range) requiring stable 3.3V for MCU and display driver. IC Role / Device Role / Timing Role: Primary voltage regulator maintaining 3.3V under varying battery discharge and dynamic load steps (10mA–150mA). Use Value: Enables >500-hour runtime via 16μA quiescent current and >85% efficiency at 50mA, eliminating need for battery replacement during field use. |
Use Scenario: Flash-based audio player with Li-Ion battery (3.1–4.2V) powering 3.3V DAC, codec, and NAND controller. IC Role / Device Role / Timing Role: Single-inductor buck-boost converter delivering regulated 3.3V across full battery voltage swing without brownouts. Use Value: Prevents audio dropout during deep discharge (<3.3V) by seamlessly entering boost mode-verified to sustain 160mA at 3.1V input. |
| PDA/GPS Receivers | USB-Powered Peripherals |
Use Scenario: GPS module in PDA requiring 3.3V from dual NiMH cells (2.4–3.0V) with cold-start sensitivity below 2.5V. IC Role / Device Role / Timing Role: Input-agnostic regulator that starts up at 1.65V and maintains regulation down to 1.8V input-critical for low-VIN GPS acquisition. Use Value: Guarantees first-fix time consistency by avoiding VOUT collapse during weak-battery GPS signal search (20–100mA pulsed loads). |
Use Scenario: USB-to-serial adapter drawing 3.3V from 5V USB bus while supporting legacy 3.3V logic levels. IC Role / Device Role / Timing Role: Step-down regulator converting 4.4–5.25V USB input to precise 3.3V, rejecting USB port voltage droop under host load. Use Value: Delivers 200mA with <20mV peak-peak ripple (10μF COUT), ensuring clean UART signaling and eliminating level-shifter requirements. |
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#TRPBF | 600mA IOUT, 2MHz switching, adjustable VOUT (2.5–5.5V), higher IQ (25μA), no fixed 3.3V option | Requires external feedback resistors; better suited for systems needing programmable output or higher current | Select LTC3440EDD#TRPBF only if adjustable output or >200mA load is required-adds complexity and cost vs. pin-compatible fixed-output LTC3531EDD#TRPBF. |
| LTC3458EDD#TRPBF | 1.4A IOUT, 1.5MHz, step-up only (VIN 1.5–6V → VOUT up to 7.5V), no buck capability | Cannot regulate when VIN > VOUT; unsuitable for Li-Ion or alkaline inputs exceeding 3.3V | LTC3458EDD#TRPBF is not a functional substitute-only consider for pure boost applications where VIN never exceeds VOUT. |
Compared with LTC3440EDD#TRPBF and LTC3458EDD#TRPBF, the LTC3531EDD#TRPBF uniquely combines fixed 3.3V output, ultra-low 16μA quiescent current, and true buck-boost operation in a minimal 3mm × 3mm DFN-making it the optimal choice for space- and battery-life-constrained 3.3V systems with variable input sources.
Availability
LTC3531EDD#TRPBF is available at Aetrix Electronics and suitable for handheld instrumentation, portable audio devices, and GPS receivers requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.
Supply support for LTC3531EDD#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 support, documentation, and manufacturing continuity for all Linear-branded power management ICs.
The LTC3531EDD#TRPBF belongs to Linear's high-efficiency, low-quiescent-current DC/DC converter family designed specifically for battery-powered portable electronics where input voltage varies above and below the required output rail.
FAQ
What is the minimum startup voltage for the LTC3531EDD#TRPBF?
The LTC3531EDD#TRPBF has a minimum startup voltage of 1.65V (typical) and 1.8V (guaranteed over temperature), enabling reliable operation from deeply discharged alkaline or NiMH cells. This specification is verified per the Absolute Maximum Ratings table and confirmed in Figure 1 of the datasheet, where start-up into a 50mA load occurs successfully at 1.6V VOUT threshold.
Does the LTC3531EDD#TRPBF require external feedback resistors?
No, the LTC3531EDD#TRPBF is the fixed 3.3V output version-its FB pin is not bonded internally, and regulation is achieved via factory-trimmed internal resistors. External feedback resistors are only required for the adjustable version (LTC3531EDD-ADJ), not for LTC3531EDD#TRPBF.
How does the LTC3531EDD#TRPBF handle output disconnect during shutdown?
During shutdown (SHDN < 0.4V), the LTC3531EDD#TRPBF opens both PMOS rectifiers (Switches A and D), physically isolating VOUT from VIN and allowing the output capacitor to fully discharge. This feature is explicitly documented in the "Output Disconnect and Inrush Limiting" section and verified in the Shorted Output waveform (Figure G24).
What is the thermal resistance (θJA) of the LTC3531EDD#TRPBF package?
The LTC3531EDD#TRPBF in the 8-lead 3mm × 3mm DFN package has a junction-to-ambient thermal resistance (θJA) of 43°C/W when the exposed pad is properly soldered to a PCB ground plane with adequate copper area and thermal vias. This value is specified in the DD Package description on page 15 of the datasheet.
Can the LTC3531EDD#TRPBF operate with a 10μH inductor?
Yes, the LTC3531EDD#TRPBF is characterized and recommended for use with a 10μH inductor (e.g., Murata LQH43CN100K03), as shown in all typical application circuits (TA01a–TA05). The datasheet specifies 10μH–22μH as the optimal range, with 10μH delivering best efficiency at medium loads (50–150mA) and acceptable ripple at 200mA.
LTC3531EDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-WFDFN 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):
- 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#TRPBF FAQ
1.How can I place an order for LTC3531EDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3531EDD#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 LTC3531EDD#TRPBF reliable?
The price and inventory of LTC3531EDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3531EDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC3531EDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3531EDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3531EDD#TRPBF?
LTC3531EDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3531EDD#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 LTC3531EDD#TRPBF?
For technical support, including LTC3531EDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3531EDD#TRPBF requirements.
6.How does Aetrix verify that LTC3531EDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC3531EDD#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 LTC3531EDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC3531EDD#TRPBF?
All LTC3531EDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3531EDD#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 LTC3531EDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC3531EDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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