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Analog Devices Inc. LT1534CS#TRPBF
- Part No.:
- LT1534CS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1534CS#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 2A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,598
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Product details
Overview
LT1534CS#TRPBF from Analog Devices (formerly Linear Technology) is a 2A ultralow-noise current-mode switching regulator optimized for low-EMI boost topologies. It features independently programmable voltage and current slew rates (11 V/µs rising, 14.5 V/µs falling), 2.7V–23V input range, and dual-polarity regulation capability (±1.25V FB / –2.5V NFB references), enabling clean power delivery in precision instrumentation and medical instruments.
For engineers reviewing the LT1534CS#TRPBF datasheet, LT1534CS#TRPBF pinout, LT1534CS#TRPBF application, or LT1534CS#TRPBF equivalent, key selection criteria include slew-controlled harmonic suppression, ±2.5% reference accuracy over temperature, 12 µA shutdown current, 20–250 kHz oscillator frequency programmability, and SO-16 package thermal performance (θJA = 100°C/W).
Technical Context
The LT1534CS#TRPBF employs a fixed-frequency current-mode architecture with internal slope compensation to ensure stability at high duty cycles. Its dual error amplifiers support simultaneous positive and negative output regulation via separate FB and NFB pins, each with dedicated transconductance (1.5 m℧ typ) and clamp voltages (0.1 V / 1.33 V).
Slew control is implemented through two independent feedback loops: RVSL sets collector voltage dV/dt (220/RVSL kΩ V/µs), while RCSL sets emitter current dI/dt (33/RCSL kΩ A/µs). The oscillator supports external synchronization up to 375 kHz and allows frequency trimming via RT (16.9 kΩ nominal) and CT capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 23V - enables operation from single-cell Li-ion to industrial 24V rails without pre-regulation |
| Output Switch Current Limit | 2A at 30% duty cycle - provides robust short-circuit protection while maintaining boost efficiency |
| Reference Voltage Accuracy | ±1.2% (1.25V FB, –2.5V NFB) - ensures tight output regulation across temperature and line variations |
| Shutdown Supply Current | 12 µA typical - minimizes battery drain in portable instrumentation during sleep mode |
| Oscillator Frequency Range | 20 kHz to 250 kHz - allows harmonic placement below sensitive RF bands or above audio range |
| Voltage Slew Rate (Rising) | 11 V/µs at RVSL = 17 kΩ - reduces high-frequency EMI by limiting dv/dt-induced capacitive coupling |
| Current Slew Rate (Rising) | 1.3 A/µs at RCSL = 17 kΩ - suppresses di/dt-induced magnetic field emissions in PCB traces and inductors |
Pinout & Package
LT1534CS#TRPBF is housed in a 16-pin narrow SOIC (SO-16) package with exposed paddle fused to four corner pins (1, 8, 9, 16) for enhanced thermal dissipation (θJA = 100°C/W). Pin 1 is NC; pins 2 and 15 are COL (collector outputs, must be tied externally); PGND (pin 3) requires ~25 nH inductance for slew loop stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COL (Pins 2, 15) | Power switch collector output | Must be externally shorted; carries full 2A switch current - minimize trace length to reduce radiation |
| PGND (Pin 3) | Power ground return | Connects to emitter of internal switch; requires ~25 nH inductance (e.g., 1" trace) for stable slew control |
| RVSL (Pin 14) | Voltage slew rate programming | Resistor to ground (3.9k–68k Ω) sets dV/dt - 17k Ω yields 11 V/µs rising edge |
| RCSL (Pin 13) | Current slew rate programming | Resistor to ground (3.9k–68k Ω) sets di/dt - 17k Ω yields 1.3 A/µs rising edge |
| FB (Pin 7) | Positive output voltage feedback | Inverting input to 1.25V reference amplifier - regulates +VOUT via resistor divider |
| NFB (Pin 8) | Negative output voltage feedback | Inverting input to –2.5V reference amplifier - regulates –VOUT with –0.5× gain |
| VC (Pin 10) | Error amplifier output & compensation | Drives current comparator; RC network here sets loop stability and soft-start behavior |
| SHDN (Pin 11) | Shutdown control | Logic-low disables all circuitry; draws <20 µA - tie to VIN or float for normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Independent slew rate control | Separate RVSL/RCSL pins allow simultaneous optimization of EMI reduction and efficiency - no trade-off forced by single-slew architecture |
| Dual-polarity regulation | Integrated NFB amplifier enables direct –2.5V regulation without external op-amps or level-shifting circuits |
| External clock synchronization | SYNC pin accepts 375 kHz square wave to precisely align switching harmonics away from critical frequency bands |
| Low-noise current-mode control | Internal slope compensation and 1.5 m℧ transconductance deliver fast transient response (<10 µs) with minimal output voltage deviation |
| Thermal and UVLO protection | Internal thermal shutdown and 2.55V undervoltage lockout prevent damage during fault conditions while pulling VC low for safe recovery |
Applications
| Medical Instrumentation | Precision Data Acquisition |
|---|---|
Use Scenario: Powering analog front-end circuitry in portable ECG monitors requiring ultra-low noise DC supplies. IC Role / Device Role / Timing Role: LT1534CS#TRPBF serves as the primary 3.3V-to-±5V isolated boost converter, delivering clean bias to instrumentation amplifiers and ADC drivers. Use Value: 40 dB harmonic suppression enables compliance with IEC 60601-2-27 EMI limits without bulky filtering, reducing BOM cost and board area. | Use Scenario: Generating stable ±15V rails for 24-bit sigma-delta ADCs in single-board data acquisition systems. IC Role / Device Role / Timing Role: LT1534CS#TRPBF operates in dual-feedback mode, regulating both +15V and –15V outputs simultaneously using FB and NFB pins. Use Value: Independent slew control maintains SNR > 110 dB by limiting switching noise injection into analog signal paths near ADC reference inputs. |
| Industrial Isolated Supplies | Wireless Baseband Power |
Use Scenario: Providing galvanically isolated ±12V supplies for RS-485 transceivers and PLC I/O modules in noisy factory environments. IC Role / Device Role / Timing Role: LT1534CS#TRPBF drives a coupled-inductor boost topology with synchronized switching to minimize common-mode noise on isolation barriers. Use Value: 12 µA shutdown current extends battery life in wireless sensor nodes during extended sleep intervals between measurement cycles. | Use Scenario: Powering RF front-end bias networks in LTE small-cell base stations where spectral purity is critical. IC Role / Device Role / Timing Role: LT1534CS#TRPBF supplies 5V to LNA and mixer ICs, with oscillator synchronized to system clock to avoid heterodyne interference in receive band. Use Value: Programmable 20–250 kHz frequency range allows harmonic placement outside 700 MHz–2.7 GHz LTE bands, eliminating costly shielding. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | 40V input, dual-channel synchronous buck, no slew control, higher quiescent current (55 µA) | Designed for high-voltage automotive DC/DC; lacks EMI-optimized slew architecture | Select only if input exceeds 23V or synchronous rectification is required - not suitable for low-EMI precision applications |
| TPS61088RHLR | 12V input max, 5A switch, fixed 500kHz frequency, no NFB pin or dual-polarity support | Optimized for consumer USB-PD power banks; no negative rail generation capability | Choose when cost and size are prioritized over EMI performance and bipolar output flexibility |
Compared with LTC3891EFE#PBF and TPS61088RHLR, the LT1534CS#TRPBF uniquely delivers programmable slew rates, dual-polarity regulation, and sub-20 µA shutdown - making it irreplaceable for EMI-sensitive instrumentation where harmonic content must be actively shaped rather than filtered.
Availability
LT1534CS#TRPBF is available at Aetrix Electronics and suitable for precision instrumentation systems, medical instruments, and industrial isolated supplies requiring stable component supply with long-term lifecycle assurance.
Supply support for LT1534CS#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 its legacy of high-performance analog and power management ICs. The company focuses on signal chain integrity, precision power, and reliability for demanding applications.
The LT1534CS#TRPBF belongs to Linear's ultralow-noise switching regulator product line, specifically engineered to replace linear regulators in noise-sensitive systems without sacrificing efficiency - targeting medical, test equipment, and high-resolution data acquisition markets.
FAQ
What is the maximum allowable input voltage for the LT1534CS#TRPBF?
The absolute maximum input voltage (VIN) for the LT1534CS#TRPBF is 30V, but the recommended operating range is 2.7V to 23V. Exceeding 23V may cause premature device stress or reduced reliability, even if within absolute ratings. Operation above 23V voids guaranteed performance per the datasheet's electrical characteristics table.
Can the LT1534CS#TRPBF regulate both positive and negative outputs simultaneously?
Yes, the LT1534CS#TRPBF supports simultaneous regulation of positive and negative outputs using its dual feedback architecture: the FB pin regulates positive voltages referenced to GND (e.g., +5V), while the NFB pin regulates negative voltages (e.g., –5V) with a –2.5V internal reference. Both pins can be active concurrently, though load regulation accuracy degrades slightly under mismatched loads.
How does slew rate programming affect efficiency in the LT1534CS#TRPBF?
Slower slew rates (higher RVSL/RCSL values) reduce high-frequency EMI but increase switching losses - measured as additional power dissipation in the output stage. For example, reducing slew from 11 V/µs to 3 V/µs may lower efficiency by 2–4% at full load due to extended transition times, as quantified in the Thermal Considerations section of the LT1534CS#TRPBF datasheet.
What is the purpose of the PGND pin's required 25nH inductance in the LT1534CS#TRPBF?
The PGND pin of the LT1534CS#TRPBF requires approximately 25nH inductance (e.g., 1" PCB trace) to stabilize the current slew control loop during switch turn-off. This intentional inductance prevents oscillation in the dI/dt sensing path; values exceeding 50nH risk instability and ringing on output voltage edges, directly impacting EMI performance and regulation accuracy.
Does the LT1534CS#TRPBF support external synchronization, and what is the maximum sync frequency?
Yes, the LT1534CS#TRPBF supports external synchronization via the SYNC pin, accepting square-wave inputs up to 375 kHz. The internal oscillator must be configured for ~10% lower free-run frequency than the desired sync frequency to ensure reliable locking. Sync pulses require >1.4V amplitude and ≥0.5 µs pulse width, with rising-edge triggering.
LT1534CS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up, Step-Up/Step-Down
- Output Configuration:
- Positive or Negative
- Topology:
- Boost, Cuk, Flyback
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 35V (Switch)
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 20kHz ~ 250kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1534CS#TRPBF FAQ
1.How can I place an order for LT1534CS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1534CS#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 LT1534CS#TRPBF reliable?
The price and inventory of LT1534CS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1534CS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1534CS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1534CS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1534CS#TRPBF?
LT1534CS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1534CS#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 LT1534CS#TRPBF?
For technical support, including LT1534CS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1534CS#TRPBF requirements.
6.How does Aetrix verify that LT1534CS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1534CS#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 LT1534CS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1534CS#TRPBF?
All LT1534CS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1534CS#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 LT1534CS#TRPBF part is unused and in its original packaging.
Return procedure for LT1534CS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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