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Analog Devices Inc. LTC3534EGN#PBF
- Part No.:
- LTC3534EGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC3534EGN#PBF.pdf
- Description:
- IC REG BUCK BST ADJ 500MA 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:963
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Product details
Overview
LTC3534EGN#PBF from Analog Devices (formerly Linear Technology) is a wide-input synchronous buck-boost DC/DC converter IC designed for single-cell Li-ion or multi-cell alkaline/NiMH battery-powered systems where input voltage may fall above, below, or equal to the regulated output. It delivers up to 500mA at 5V from 4 AA cells (3.6V–6.4V), features 2.4V–7V input and 1.8V–7V output ranges, 1MHz fixed-frequency switching, and Burst Mode operation with 25µA quiescent current.
For engineers reviewing the LTC3534EGN#PBF datasheet, LTC3534EGN#PBF pinout, LTC3534EGN#PBF application, or LTC3534EGN#PBF equivalent, key selection criteria include its four-switch topology enabling seamless buck/buck-boost/boost transitions, programmable soft-start via RUN/SS, output disconnect in shutdown, and thermal protection - all in a 16-lead SSOP narrow package.
Technical Context
The LTC3534EGN#PBF implements a proprietary four-switch synchronous buck-boost topology with continuous transfer function across operating modes. Its internal control voltage (VCI) determines conduction phasing of switches A–D, enabling smooth transitions between buck (VIN > VOUT), buck-boost (VIN ≈ VOUT), and boost (VIN < VOUT) regions without discontinuity or mode-hopping artifacts.
It integrates dual current-limit circuits: an average input current limit (1.8A typical, foldback to 800mA during short-circuit/startup) and a high-speed peak current comparator (2.6A typical, 50ns response). Reverse current limiting (500mA typical) prevents negative inductor current in forced CCM during fixed-frequency operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 2.4V to 7V - supports 4-cell alkaline (3.6V–6.4V) and single Li-ion (3.0V–4.2V) without external LDO pre-regulation |
| VOUT Range | 1.8V to 7V - adjustable via resistor divider; 5V output at 500mA demonstrated in typical application |
| Switching Frequency | 1MHz ±15% - enables compact 4.7µH inductor and low-profile ceramic capacitors |
| Quiescent Current (Burst) | 25µA typical - extends battery runtime in portable devices with intermittent load |
| Shutdown Current | <1µA - ensures minimal battery drain during system sleep or off-state |
| Efficiency (Peak) | 94% - achieved via synchronous rectification and low RDS(ON) MOSFETs (215–275mΩ) |
| Output Disconnect | Enabled in shutdown - prevents backfeed from VOUT to VIN, critical for battery isolation |
Pinout & Package
The LTC3534EGN#PBF is housed in a 16-lead plastic SSOP narrow (GN) package, 5.3mm × 4.4mm × 1.75mm, with exposed GND pads (Pins 1, 8, 9, 16) requiring soldering to PCB for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1, 3, 8, 9, 16) | Signal and substrate ground | Pins 1/8/9/16 are PGND - must be soldered to PCB ground plane for thermal dissipation and noise immunity |
| RUN/SS (2) | Enable and soft-start control | Voltage <0.4V disables IC; >1.4V enables; RC network provides controlled VC ramp for inrush-limited start-up |
| PGND1 / PGND2 (4, 7) | Power ground for NMOS switches B/C | Low-impedance return path for high di/dt switch currents; separate from signal GND to reduce noise coupling |
| SW1 (5) / SW2 (6) | Internal switch node connections | Connect inductor between SW1 and SW2; minimize trace length and loop area to suppress EMI |
| PWM (10) | Burst Mode enable/disable | Logic-low (<0.4V) activates Burst Mode; logic-high (>1.4V) forces fixed-frequency PWM operation |
| VOUT (11) | Regulated output | Delivers up to 500mA; requires local 22µF ceramic capacitor and optional feedforward cap for ripple reduction |
| PVIN (12) | Power input supply | Dedicated high-current VIN path; bypass with 10µF ceramic capacitor close to PVIN/PGND pins |
| VIN (13) | Input supply reference | Provides bias for internal circuitry; tied to PVIN in most applications but may be decoupled separately |
| VC (14) | Error amplifier output | Loop compensation node; connected to FB via R-C network; actively clamped during Burst Mode to prevent transients |
| FB (15) | Feedback input | Monitors output via resistor divider; reference voltage = 1.000V ±15mV; input current <50nA minimizes divider error |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch synchronous topology | Enables seamless regulation across VIN > VOUT, VIN ≈ VOUT, and VIN < VOUT without mode switching artifacts or output glitches |
| Programmable Burst Mode | User-selectable via PWM pin; reduces IQ to 25µA while maintaining regulation, ideal for battery-powered standby operation |
| Integrated soft-start and shutdown | Combined RUN/SS pin allows controlled power-up with adjustable rise time and <1µA shutdown current |
| Robust protection suite | Includes thermal shutdown, short-circuit protection, reverse current limit (500mA), and dual-stage input current limiting (800mA/1.8A/2.6A) |
| Output disconnect in shutdown | Prevents back-powering of input source - essential for battery-powered systems requiring true isolation |
Applications
| Medical Instruments | Portable Barcode Readers |
|---|---|
Use Scenario: Handheld blood glucose meters powered by two AA batteries (2.4V–3.2V) requiring stable 3.3V rail for MCU and sensor interface. IC Role / Device Role / Timing Role: Buck-boost regulator maintaining 3.3V output as battery discharges from 3.2V down to 2.4V - operating in boost mode throughout discharge cycle. Use Value: Eliminates need for battery replacement before end-of-life; 94% peak efficiency and 25µA Burst Mode IQ extend usable runtime by >30% vs. linear regulators. | Use Scenario: Ruggedized industrial barcode scanner using 4 AA cells (3.6V–6.4V) powering 5V imaging sensor and laser driver. IC Role / Device Role / Timing Role: Primary 5V power supply delivering 500mA continuously; operates in buck mode at full charge, transitions smoothly to buck-boost then boost as battery depletes. Use Value: Single-inductor architecture simplifies layout and reduces BOM count; output disconnect prevents sensor latch-up during battery swap. |
| USB to 5V Supply | Handheld GPS |
Use Scenario: Portable USB-powered device (e.g., OTG accessory) accepting 4.75V–5.25V USB input but requiring clean 5V output with surge tolerance. IC Role / Device Role / Timing Role: Regulator with input voltage rejection - maintains 5V output despite USB port droop under load or cable resistance. Use Value: Fixed 1MHz frequency avoids audible noise; <1µA shutdown current preserves host battery when accessory is idle. | Use Scenario: Battery-operated hiking GPS unit using single Li-Po cell (3.0V–4.2V) powering 3.3V RF front-end and 1.8V baseband processor. IC Role / Device Role / Timing Role: Dual-output capable via feedback divider tuning; supplies 3.3V rail in buck-boost region across full battery range. Use Value: Seamless mode transition prevents GPS signal loss during low-VIN conditions; thermal protection prevents overheating in enclosed plastic housing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | 3.2V–12V input, 1.2V–5.5V output; 2A max output; 2.5MHz switching; no integrated soft-start | Higher output current and wider VIN, but lacks output disconnect and has higher IQ (34µA Burst) | Preferred for higher-power applications where 2A output and smaller inductors justify trade-offs in shutdown isolation and soft-start flexibility |
| MAX77827BEWC+T | 2.5V–5.5V input, 2.6V–5.2V output; 2A max; I²C programmable; 1.5MHz; integrated power-path management | Narrower input range; requires digital interface; no Burst Mode; adds battery charging functionality | Suitable when system-level power management (charging + regulation) is needed, but not for standalone analog-controlled buck-boost replacement |
Compared with TPS63020DSJR and MAX77827BEWC+T, the LTC3534EGN#PBF offers superior battery isolation via output disconnect, lower quiescent current in Burst Mode (25µA vs. 34µA), and analog-only control simplicity - making it optimal for cost-sensitive, low-power, battery-isolated portable designs.
Availability
LTC3534EGN#PBF is available at Aetrix Electronics and suitable for medical instrumentation, portable data capture, USB-powered accessories, and handheld navigation systems requiring stable component supply, long battery life, and robust overtemperature/overcurrent protection.
Supply support for LTC3534EGN#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and power management semiconductors.
The LTC3534EGN#PBF belongs to Linear's precision power conversion product line, engineered specifically for battery-powered portable electronics demanding seamless voltage regulation across varying battery states-of-charge.
FAQ
What is the maximum continuous output current capability of the LTC3534EGN#PBF?
The LTC3534EGN#PBF delivers up to 500mA at 5V output when supplied by 4 AA cells (3.6V–6.4V), as verified in the Typical Application circuit. Peak current capability depends on input voltage and operating mode: in buck mode (VIN > VOUT), it supports up to 1.8A average input current; in boost mode (VIN < VOUT), output current is limited by thermal design and inductor saturation, with 500mA sustained at 5V being the validated design point for the GN package.
Does the LTC3534EGN#PBF support output voltages below 1.8V?
Yes, the LTC3534EGN#PBF can regulate down to 400mV in buck mode, but requires an external Schottky diode from SW2 to VOUT when VOUT < 1.8V due to increased RDS(ON) of synchronous switch D. Burst Mode operation is inhibited below 1.6V, and current limit folds back to 800mA when VOUT < 0.9V - both constraints are documented in the Applications Information section of the LTC3534 datasheet.
How does the RUN/SS pin function on the LTC3534EGN#PBF?
The RUN/SS pin on the LTC3534EGN#PBF combines enable control and soft-start functionality. Pulling it below 0.4V shuts down the IC with <1µA current draw. Raising it above 1.4V enables operation, and driving it above 2.4V ensures the error amplifier is fully released from soft-start clamping. An RC network from this pin to ground controls the ramp rate of the VC node, preventing inrush current and output overshoot during startup.
What is the purpose of the PWM pin on the LTC3534EGN#PBF?
The PWM pin on the LTC3534EGN#PBF selects between Burst Mode and fixed-frequency PWM operation. Driving it low (<0.4V) enables Burst Mode, reducing quiescent current to 25µA for extended battery life at light loads. Driving it high (>1.4V) forces continuous 1MHz switching for low-noise, predictable EMI performance - required for sensitive analog or RF circuits sharing the same power domain as the LTC3534EGN#PBF.
Can the LTC3534EGN#PBF be used with ceramic output capacitors only?
Yes, the LTC3534EGN#PBF is fully compatible with ceramic output capacitors. The datasheet specifies a minimum 22µF X5R/X7R ceramic capacitor placed close to the VOUT and GND pins. Ceramic caps provide low ESR for reduced ripple and fast transient response. For Burst Mode ripple reduction, ≥47µF is recommended; adding a small feedforward capacitor (e.g., 33pF) across the upper feedback resistor further suppresses variable-frequency ripple without compromising stability.
LTC3534EGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- 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):
- 2.4V
- Voltage - Input (Max):
- 7V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 7V
- Current - Output:
- 500mA
- Frequency - Switching:
- 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC3534EGN#PBF FAQ
1.How can I place an order for LTC3534EGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC3534EGN#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 LTC3534EGN#PBF reliable?
The price and inventory of LTC3534EGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC3534EGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC3534EGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC3534EGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC3534EGN#PBF?
LTC3534EGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC3534EGN#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 LTC3534EGN#PBF?
For technical support, including LTC3534EGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC3534EGN#PBF requirements.
6.How does Aetrix verify that LTC3534EGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC3534EGN#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 LTC3534EGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC3534EGN#PBF?
All LTC3534EGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC3534EGN#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 LTC3534EGN#PBF part is unused and in its original packaging.
Return procedure for LTC3534EGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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