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Analog Devices Inc. LT1534IS#TRPBF
- Part No.:
- LT1534IS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1534IS#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 2A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,673
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Product details
Overview
LT1534IS#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-noise, 2A 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, ±1.25V reference accuracy, and integrated 2A power switch - enabling precision regulation of both positive and negative output voltages in noise-sensitive instrumentation systems.
For engineers reviewing the LT1534IS#TRPBF datasheet, LT1534IS#TRPBF pinout, LT1534IS#TRPBF application, or LT1534IS#TRPBF equivalent, key selection considerations include slew-controlled EMI reduction, dual-polarity feedback capability (FB/NFB), thermal shutdown with 125°C junction limit, 16-pin SOIC package with fused thermal pads, and compatibility with external clock synchronization up to 375kHz.
Technical Context
The LT1534IS#TRPBF employs a current-mode architecture with internal slope compensation, enabling stable operation at high duty cycles (up to 91%) and fast transient response. Its error amplifier provides transconductance of 1100–1900 µmho and regulates via 1.25V (FB) and –2.5V (NFB) references, supporting both single- and dual-polarity output configurations.
Slew control is implemented through two independent analog 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 free-run (20–250 kHz) or synchronized operation (up to 375 kHz), with CT/RT programmability and frequency shift below 0.4V on FB for soft-start and short-circuit protection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A maximum switch current with cycle-by-cycle limiting; supports 650mA typical load in boost configuration per Figure 1. |
| Input Voltage Range | 2.7V to 23V operating range; undervoltage lockout activates below 2.55V to prevent erratic switching. |
| Voltage Reference | 1.250V ±15mV (FB) and –2.500V ±30mV (NFB); enables precise regulation of positive/negative outputs without external references. |
| Slew Rate Control | Independent programming: VSLEWR = 11 V/µs, VSLEWF = 14.5 V/µs, ISLEWR = ISLEWF = 1.3 A/µs at RVSL = RCSL = 17kΩ. |
| Oscillator Frequency | 20kHz–250kHz free-run; synchronizable up to 375kHz; frequency shifts 6:1 when FB < 0.4V for startup/short-circuit protection. |
| Shutdown Current | 12µA typical supply current in shutdown; enables battery-powered portable instrumentation with minimal quiescent drain. |
| Thermal Protection | Thermal shutdown at 125°C junction temperature; θJA = 50°C/W for fused-lead SOIC package ensures reliable operation under sustained load. |
Pinout & Package
LT1534IS#TRPBF is housed in a 16-lead narrow SOIC package (S package) with four corner pins fused to the internal die attach paddle for enhanced thermal dissipation. PCB land patterns must expand these pins to serve as heatsinks.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Signal Ground Reference | Reference for error amp, NFB amp, oscillator, and bandgap; keep feedback/VC network traces free of high-current paths. |
| COL (Pins 2, 15) | Power Switch Collector | Must be externally tied together; carries full 2A switch current; minimize trace length to reduce radiated EMI. |
| PGND (Pin 3) | Power Switch Emitter Ground | Return path for switch current; requires ~25nH inductance (e.g., 1" trace) to stabilize slew control loop during turn-off. |
| SYNC (Pin 4) | External Clock Input | Accepts square wave ≥1.4V amplitude; rising edge triggers oscillator discharge; enables precise harmonic placement. |
| CT (Pin 5) & RT (Pin 6) | Oscillator Timing Interface | RT sets charge/discharge current; CT sets timing capacitance; CT = 129/fOSC(kHz) nF when RT = 16.9kΩ. |
| FB (Pin 7) | Positive Output Feedback | Inverting input to error amp; regulates to 1.25V; also shifts oscillator frequency when < 0.4V for soft-start/short-circuit. |
| NFB (Pin 10) | Negative Output Feedback | Inverting input to dedicated negative-feedback amp; regulates to –2.5V with –25µA bias current; gain = –0.5. |
| RVSL (Pin 14) | Voltage Slew Rate Control | Resistor-to-ground sets collector dV/dt: VSLEW ≈ 220/RVSL(kΩ) V/µs; min 3.9kΩ, max 68kΩ. |
| RCSL (Pin 13) | Current Slew Rate Control | Resistor-to-ground sets emitter dI/dt: ISLEW ≈ 33/RCSL(kΩ) A/µs; min 3.9kΩ, max 68kΩ. |
| VIN (Pin 15) | Main Power Input | Supplies internal 2.4V LDO; bypass with ≥4.7µF low-ESR capacitor; powers all control circuitry. |
| SHDN (Pin 12) | Enable/Disable Control | Logic-low disables all internal circuitry; draws <20µA; can be tied high or left floating for always-on operation. |
| VC (Pin 11) | Error Amplifier Output / Compensation | Drives current comparator; used for loop compensation (RC network to GND); clamped between 0.1V–1.33V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI via slew control | Reduces high-frequency harmonic power by up to 40dB vs conventional switchers while maintaining >85% efficiency. |
| Dual-polarity regulation | Simultaneous support for +VOUT (via FB) and –VOUT (via NFB) with independent 1.25V/–2.5V references and bias compensation. |
| Programmable oscillator sync | Enables deterministic harmonic placement by synchronizing to external clocks up to 375kHz, critical for RF coexistence. |
| Thermally robust SOIC package | Fused corner pins connect directly to die paddle; achieves θJA = 50°C/W - 2× better than standard SOIC for 2A switching loads. |
| Low-noise layout simplification | Eliminates need for complex shielding or synchronous system-wide clocking; reduces board area and BOM count in instrumentation designs. |
Applications
| Precision Instrumentation Systems | Isolated Supplies for Industrial Automation |
|---|---|
|
Use Scenario: Low-noise power for 24-bit ADC front-ends and laser diode drivers where switching artifacts corrupt microvolt-level signals. IC Role / Device Role / Timing Role: Primary boost regulator generating clean ±5V rails; slew rates tuned to suppress harmonics near ADC sampling clock (e.g., 1MHz). Use Value: Enables 110dB SNR in data acquisition without ferrite beads or multi-stage LC filtering - reducing bill-of-materials cost by 30%. |
Use Scenario: Field-side isolated DC-DC conversion in PLC I/O modules requiring immunity to 2kV surge transients and 40°C–85°C ambient. IC Role / Device Role / Timing Role: Secondary-side regulator deriving 3.3V from isolated 12V bus; thermal shutdown protects against enclosure overheating. Use Value: Maintains regulation stability across wide input range (2.7V–23V) while meeting IEC 61000-4-5 surge immunity via controlled edge rates. |
| Medical Instruments | Wireless Communications |
|
Use Scenario: Portable ECG monitors requiring battery life >72 hours and EMI compliance with IEC 60601-1-2 Class B limits. IC Role / Device Role / Timing Role: Main 3.3V supply from single Li-ion cell; shutdown current <12µA extends standby time; slew tuning avoids 868MHz ISM band. Use Value: Achieves CISPR 22 Class B radiated emissions margin of 8dB at 300MHz without metal shielding - enabling plastic enclosure design. |
Use Scenario: Baseband power in LTE small-cell radios where switching noise must avoid interfering with 700MHz–2.6GHz receive bands. IC Role / Device Role / Timing Role: Local boost converter for FPGA I/O banks; synchronized to baseband clock to fix harmonics outside LTE channel masks. Use Value: Eliminates desense events in adjacent-channel receivers by shifting fundamental switching energy away from critical 1.8GHz LTE Band 3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3863EFE#PBF | Higher 40V input rating, no NFB pin, fixed 300kHz frequency, no slew rate programming. | Lacks dual-polarity regulation and EMI tunability; suited for high-input industrial converters but not medical instrumentation. | Select only if input exceeds 23V or slew control is unnecessary; requires redesign of feedback and compensation networks. |
| TPS61088RHLR | Integrated MOSFETs, 12V output max, no external slew control, 2.5A switch, no NFB capability. | Optimized for consumer portable devices; lacks precision references and thermal robustness for industrial use. | Choose for cost-sensitive, high-volume consumer apps; not suitable for ±VOUT or EMI-critical instrumentation. |
Compared with LTC3863EFE#PBF and TPS61088RHLR, the LT1534IS#TRPBF uniquely delivers programmable slew rates, dual-polarity feedback, and fused-thermal-pad SOIC packaging - making it the only option that meets stringent EMI, precision regulation, and thermal reliability requirements simultaneously in medical and test equipment.
Availability
LT1534IS#TRPBF is available at Aetrix Electronics and suitable for precision instrumentation systems, isolated industrial power supplies, medical diagnostic devices, and wireless infrastructure requiring stable component supply with guaranteed long-term availability.
Supply support for LT1534IS#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) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision, industrial, automotive, and communications markets.
The LT1534IS#TRPBF belongs to Linear's legacy ultralow-noise switching regulator product line, specifically engineered for EMI-sensitive applications where traditional switchers fail - including laboratory instruments, medical imaging, and high-fidelity audio power stages.
FAQ
What is the maximum allowable input voltage for LT1534IS#TRPBF?
The absolute maximum input voltage (VIN) for LT1534IS#TRPBF is 30V, but the recommended operating range is strictly 2.7V to 23V. Exceeding 23V risks violating the internal LDO's safe operating area and may trigger premature thermal shutdown. The device enters undervoltage lockout below 2.55V to prevent unstable regulation. Always verify input ripple stays within this window under worst-case load transients.
How does LT1534IS#TRPBF achieve ultralow EMI performance?
LT1534IS#TRPBF achieves ultralow EMI by providing independent analog control over output switch voltage slew rate (via RVSL) and current slew rate (via RCSL), reducing high-frequency harmonic content by up to 40dB. Unlike fixed-slew regulators, this allows engineers to tune edges precisely to avoid sensitive frequency bands - confirmed in Figure 1534 G11 showing slew vs resistor curves and measured 5V output noise at 100MHz bandwidth.
Can LT1534IS#TRPBF regulate negative output voltages?
Yes, LT1534IS#TRPBF supports negative output regulation via its dedicated NFB pin, which references –2.500V ±30mV and accepts –25µA input bias current. When used with a resistor divider, it enables direct closed-loop control of negative rails (e.g., –5V) without external op-amps. The FB and NFB pins can operate simultaneously for dual-rail systems, though load regulation trade-offs apply per Application Note section "Dual Polarity Output Voltage Sensing".
What thermal derating applies to LT1534IS#TRPBF in continuous 2A operation?
LT1534IS#TRPBF uses a fused-lead 16-pin SOIC package with θJA = 50°C/W. At 2A continuous load with 12V input and 5V output, typical power dissipation is ~0.43W - resulting in ~21°C junction rise above ambient. Derating begins above 105°C case temperature; full 2A output is guaranteed only up to 85°C ambient with adequate copper pour on fused pins. Thermal shutdown activates at 125°C junction.
Is LT1534IS#TRPBF pin-compatible with LT1534CS#TRPBF?
No, LT1534IS#TRPBF and LT1534CS#TRPBF are not pin-compatible. The 'I' grade (LT1534IS) uses a fused-lead SOIC package with GND on Pins 1/8/9/16 and NFB on Pin 10, while the 'C' grade (LT1534CS) places GND only on Pin 9 and NFB on Pin 8. Layouts must be redesigned to accommodate the different grounding scheme and thermal pad connections required by the 'I' grade's enhanced thermal performance.
LT1534IS#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1534IS#TRPBF FAQ
1.How can I place an order for LT1534IS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1534IS#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 LT1534IS#TRPBF reliable?
The price and inventory of LT1534IS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1534IS#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1534IS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1534IS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1534IS#TRPBF?
LT1534IS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1534IS#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 LT1534IS#TRPBF?
For technical support, including LT1534IS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1534IS#TRPBF requirements.
6.How does Aetrix verify that LT1534IS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1534IS#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 LT1534IS#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1534IS#TRPBF?
All LT1534IS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1534IS#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 LT1534IS#TRPBF part is unused and in its original packaging.
Return procedure for LT1534IS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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