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Analog Devices Inc. LT1534CS-1#TRPBF
- Part No.:
- LT1534CS-1#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1534CS-1#TRPBF.pdf
- Description:
- IC REG BOOST CUK ADJ 2A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,383
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Product details
Overview
LT1534CS-1#TRPBF from Analog Devices (formerly Linear Technology) is a 2A ultralow-noise current-mode switching regulator optimized for EMI-sensitive boost and inverting topologies. It features independently programmable voltage and current slew rates (11 V/µs rising, 14.5 V/µs falling), 2.7V–23V input range, ±2.5V dual-polarity feedback capability, and 20kHz–250kHz adjustable oscillator frequency. It is used in precision instrumentation power supplies where conducted/radiated noise must be minimized.
For engineers reviewing the LT1534CS-1#TRPBF datasheet, LT1534CS-1#TRPBF pinout, LT1534CS-1#TRPBF application, or LT1534CS-1#TRPBF equivalent, key selection considerations include slew-controlled harmonic suppression, negative voltage regulation via NFB pin, thermal performance in 16-pin SO with fused paddle, shutdown current of 12 µA, and compatibility with low-ESR polymer/tantalum output capacitors.
Technical Context
The LT1534CS-1#TRPBF employs a current-mode architecture with internal slope compensation, enabling stable operation up to 91% duty cycle and fast transient response. Its dual error amplifiers support simultaneous positive (FB pin, 1.25 V reference) and negative (NFB pin, –2.5 V reference) output regulation, with transconductance of 1.5 mho and clamp voltages of 1.33 V (high) and 0.1 V (low).
Slew control is implemented via two independent external resistors - RVSL sets collector voltage dV/dt (220/RVSL kΩ), RCSL sets emitter current dI/dt (33/RCSL kΩ) - enabling precise harmonic shaping without sacrificing efficiency beyond ~1–2%. The oscillator supports synchronization to external clocks up to 375 kHz and includes frequency-shift-on-fault (FB < 0.4 V reduces fOSC 6:1).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2 A continuous, with cycle-by-cycle current limiting at 1.6–2 A depending on duty cycle |
| Input Voltage Range | 2.7 V to 23 V - enables single-cell Li-ion to 24 V industrial rail operation |
| Voltage Slew Rate | 11 V/µs (rising), 14.5 V/µs (falling) - directly programmable via RVSL resistor for EMI tailoring |
| Current Slew Rate | 1.3 A/µs (both edges) - set by RCSL resistor to suppress di/dt-induced radiation |
| Oscillator Frequency | 20 kHz to 250 kHz - adjustable via RT/CT; synchronizable up to 375 kHz for harmonic placement |
| Shutdown Current | 12 µA typical - supports battery-powered portable instrumentation with long standby life |
| Negative Feedback Reference | –2.500 V ±50 mV - enables direct regulation of negative rails without external op-amps |
| Thermal Resistance | θJA = 50 °C/W - achieved via four fused corner pins connected to PCB thermal pad |
Pinout & Package
LT1534CS-1#TRPBF is housed in a 16-lead plastic SO package with four corner pins (1, 8, 9, 16) fused to the internal die attach paddle for enhanced thermal dissipation. These pins must be soldered to expanded PCB copper lands per manufacturer guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Signal Ground Reference | Reference for error amp, oscillator, bandgap, and slew circuitry; separate from PGND to avoid noise coupling |
| COL (Pins 2, 15) | Power Switch Collector | High-current output node; both pins must be shorted externally to form single collector terminal |
| PGND (Pin 3) | Power Switch Emitter Ground | Return path for switch current; requires ~25 nH inductance (e.g., 1" trace) for slew loop stability |
| SYNC (Pin 4) | Oscillator Sync Input | Accepts >1.4 V square wave to force discharge edge; enables precise harmonic positioning |
| CT (Pin 5) | Oscillator Timing Capacitor | Charged/discharged by RT current; CT = 129/fOSC (nF) when RT = 16.9 kΩ |
| RT (Pin 6) | Oscillator Timing Resistor | Sets charge/discharge current; nominal 16.9 kΩ, ±25% trimmable for frequency accuracy |
| FB (Pin 7) | Positive Feedback Input | Inverting input to error amp; regulates to 1.25 V; enables frequency shift if pulled below 0.4 V |
| NFB (Pin 10) | Negative Feedback Input | Regulates to –2.5 V via internal –0.5× gain amplifier; supports isolated negative rail sensing |
| SHDN (Pin 12) | Shutdown Control | Active-low enable; pulls VC low and disables all circuitry when grounded; draws ≤20 µA in shutdown |
| RVSL (Pin 14) | Voltage Slew Rate Set | Resistor-to-ground sets dV/dt: VSLEW ≈ 220/RVSL (V/µs); min 3.9 kΩ, max 68 kΩ |
| RCSL (Pin 13) | Current Slew Rate Set | Resistor-to-ground sets di/dt: ISLEW ≈ 33/RCSL (A/µs); min 3.9 kΩ, max 68 kΩ |
| VC (Pin 11) | Error Amplifier Output | Compensation node for loop stability; also sets current limit threshold and enables soft-start |
| VIN (Pin 15) | Input Supply | Power source for internal LDO (2.4 V); bypass with ≥4.7 µF low-ESR capacitor; UVLO at 2.55 V |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI via slew control | Up to 40 dB reduction in high-frequency harmonic power without major efficiency penalty |
| Dual-polarity regulation | Simultaneous +VOUT (via FB) and –VOUT (via NFB) regulation using single IC - eliminates dual-controller layout complexity |
| Programmable oscillator sync | External clock synchronization up to 375 kHz enables deterministic harmonic placement in RF-sensitive systems |
| Thermally enhanced SO package | Fused corner pins reduce θJA to 50 °C/W - critical for sustained 2 A operation in compact enclosures |
| Low-noise bias architecture | 12 µA shutdown current and 1.25 V ±15 mV reference enable stable, low-drift operation in portable instrumentation |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown, and UVLO prevent damage during fault conditions without external components |
Applications
| Precision Instrumentation Power | Isolated Industrial Sensor Supply |
|---|---|
Use Scenario: Low-noise ±15 V supply for 24-bit ADC front-end in automated test equipment. IC Role / Device Role / Timing Role: Primary boost/inverting regulator delivering clean, slew-controlled switching waveform to minimize analog signal corruption. Use Value: 40 dB lower radiated emissions vs conventional switchers enables Class I EMC compliance without shielding or filtering overhead. |
Use Scenario: Dual-rail isolated DC-DC for 4–20 mA loop-powered field transmitters in hazardous areas. IC Role / Device Role / Timing Role: Regulator with NFB pin directly regulating –12 V rail while FB pin controls +12 V, ensuring matched load regulation across galvanically isolated outputs. Use Value: Eliminates need for separate negative regulator IC, reducing BOM count and board area by 35% in space-constrained modules. |
| Medical Imaging Bias Supply | Wireless Baseband Power |
Use Scenario: Low-ripple ±5 V bias for ultrasound transducer driver arrays requiring sub-mV noise floor. IC Role / Device Role / Timing Role: Slew-programmed boost converter operating at 125 kHz to place fundamental harmonics outside imaging bandwidth (1–15 MHz). Use Value: Programmable dV/dt and di/dt suppresses switching artifacts that would otherwise alias into echo signal chain. |
Use Scenario: Compact 3.3 V to 5 V boost supply for LTE modem power management unit with strict conducted EMI limits. IC Role / Device Role / Timing Role: Synchronized regulator locked to baseband clock to avoid interference with adjacent RF bands (e.g., Band 13 uplink). Use Value: External SYNC pin enables harmonic alignment with non-critical timing windows, reducing pre-compliance rework cycles by 2–3 iterations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EMSE#PBF | Higher 60 V input rating, no slew control, integrated gate drivers, requires external MOSFETs | Better suited for high-voltage industrial DC-DC; lacks EMI optimization features of LT1534CS-1#TRPBF | Select when input exceeds 23 V or discrete FET control is preferred over integrated switch |
| TPS61088RHLR | Fixed 500 kHz fSW, no NFB pin, no slew programming, 12 A peak current, smaller 3 mm × 3 mm QFN | Optimized for high-efficiency consumer boost; cannot regulate negative rails or suppress harmonics below 100 kHz | Select for cost-sensitive, high-current portable apps where EMI is managed via layout/filtering, not IC-level control |
Compared with LTC3891EMSE#PBF and TPS61088RHLR, the LT1534CS-1#TRPBF uniquely delivers programmable slew rates, dual-polarity regulation, and sub-250 kHz operation - making it the only option among the three for EMI-critical, dual-rail, low-frequency switching applications in medical and precision test equipment.
Availability
LT1534CS-1#TRPBF is available at Aetrix Electronics and suitable for precision instrumentation systems, isolated industrial sensor supplies, and medical imaging bias circuits requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for LT1534CS-1#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT1534CS-1#TRPBF belongs to Linear's legacy ultralow-noise switching regulator family, designed specifically for EMI-sensitive applications in test & measurement, medical, and industrial automation where traditional switchers fail EMC requirements.
FAQ
What is the primary function of the NFB pin on the LT1534CS-1#TRPBF?
The NFB pin on the LT1534CS-1#TRPBF serves as the dedicated input for regulating negative output voltages. Internally, it connects to a transconductance amplifier with –0.5× gain, causing the pin to regulate precisely to –2.500 V ±50 mV. When used, it drives the FB pin to 1.25 V through internal feedback, enabling true dual-rail regulation without external op-amps. This functionality is confirmed in the Electrical Characteristics table and Block Diagram of the LT1534/LT1534-1 datasheet.
Can the LT1534CS-1#TRPBF operate with an input voltage below 2.7 V?
The LT1534CS-1#TRPBF has a recommended minimum input voltage of 2.7 V, but its absolute minimum is 2.55 V per the Electrical Characteristics table. Below 2.55 V, undervoltage lockout activates, halting switching and pulling the VC pin low. Operation at 2.6 V may occur intermittently near temperature extremes but is outside guaranteed specification and not recommended for production designs.
How does the slew rate programming work on the LT1534CS-1#TRPBF?
The LT1534CS-1#TRPBF uses two dedicated pins - RVSL (Pin 14) and RCSL (Pin 13) - each accepting a resistor to ground to set independent slew rates. Voltage slew is calculated as VSLEW ≈ 220/RVSL (V/µs); current slew as ISLEW ≈ 33/RCSL (A/µs). Both resistors must be between 3.9 kΩ and 68 kΩ. This dual-control architecture allows harmonic content tuning without altering topology or efficiency drastically - a feature explicitly documented in the Applications Information section.
What thermal design guidance applies to the LT1534CS-1#TRPBF package?
The LT1534CS-1#TRPBF uses a 16-pin SO package with four corner pins (1, 8, 9, 16) fused to the internal die paddle. These pins must be soldered to expanded PCB copper lands to achieve the specified θJA of 50 °C/W. Failure to connect them results in significantly higher junction temperatures. Thermal calculations require summing three dissipation terms: input current loss, saturation loss, and slew-related loss - all detailed in the Applications Information section with example computation.
Does the LT1534CS-1#TRPBF support synchronization to an external clock?
Yes, the LT1534CS-1#TRPBF supports external clock synchronization via the SYNC pin (Pin 4). A square wave with >1.4 V amplitude and ≥0.5 µs pulse width can force oscillator discharge on each rising edge. The datasheet specifies a maximum sync frequency of 375 kHz and recommends setting free-run frequency 10% lower than target sync frequency to maintain slope compensation integrity and avoid subharmonic oscillation.
LT1534CS-1#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-1#TRPBF FAQ
1.How can I place an order for LT1534CS-1#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1534CS-1#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-1#TRPBF reliable?
The price and inventory of LT1534CS-1#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-1#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1534CS-1#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1534CS-1#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1534CS-1#TRPBF?
LT1534CS-1#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1534CS-1#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-1#TRPBF?
For technical support, including LT1534CS-1#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1534CS-1#TRPBF requirements.
6.How does Aetrix verify that LT1534CS-1#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1534CS-1#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-1#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1534CS-1#TRPBF?
All LT1534CS-1#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1534CS-1#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-1#TRPBF part is unused and in its original packaging.
Return procedure for LT1534CS-1#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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