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Analog Devices Inc. LT1534CS#PBF
- Part No.:
- LT1534CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1534CS#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 2A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,040
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Product details
Overview
LT1534CS#PBF from Analog Devices (formerly Linear Technology) is a 2A ultralow-noise current-mode switching regulator IC designed for EMI-sensitive applications. 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 reference / –2.5V NFB reference). It is used in precision instrumentation power supplies where conducted/radiated noise must be minimized.
For engineers reviewing the LT1534CS#PBF datasheet, LT1534CS#PBF pinout, LT1534CS#PBF application, or LT1534CS#PBF equivalent, key selection criteria include slew-controlled harmonic suppression, ±2.5V feedback compliance, 2A integrated switch RON (0.25 Ω typ), thermal shutdown with VC-pin clamping, and SO-16 package compatibility with fused-lead thermal enhancement.
Technical Context
The LT1534CS#PBF implements a fixed-frequency current-mode architecture optimized for low-noise boost topologies. Its dual error amplifiers support simultaneous positive (FB) and negative (NFB) output regulation, with transconductance (gm = 1.5 mho typ) and clamp voltages (VCLH = 1.33 V, VCLL = 0.1 V) enabling precise loop control and soft-start via the VC pin.
Slew control is achieved through two independent external resistor networks: RVSL sets collector voltage dV/dt (220/RVSL kΩ), while RCSL sets emitter current dI/dt (33/RCSL kΩ). The oscillator supports synchronization (fSYNC up to 375 kHz) and frequency trimming via RT/CT, with internal slope compensation ensuring stability at high duty cycles (DCMAX = 91%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A continuous with cycle-by-cycle current limiting; ILIM = 2A at 30% duty cycle, derated to 1.6A at 80% duty cycle. |
| Input Voltage Range | 2.7V to 23V operating; undervoltage lockout activates below 2.55V to prevent erratic switching. |
| Switch RON | 0.25 Ω typical (measured with both COL pins tied); enables low conduction loss in high-current boost paths. |
| Shutdown Current | 12 µA typical; supports battery-powered portable systems requiring ultra-low quiescent drain. |
| Oscillator Frequency | 20 kHz to 250 kHz user-adjustable; synchronized operation supported up to 375 kHz via SYNC pin. |
| Feedback Reference | +1.25 V at FB pin (±15 mV tolerance); –2.50 V at NFB pin (±30 mV tolerance) for dual-rail regulation. |
| Voltage Slew Rate | 11 V/µs (rising), 14.5 V/µs (falling) with RVSL = RCSL = 17 kΩ; reduces high-frequency harmonic power by up to 40 dB. |
Pinout & Package
LT1534CS#PBF is housed in a 16-lead narrow SOIC (S package) with four corner pins fused to the die attach paddle for enhanced thermal dissipation. Pin 1 is NC; Pins 1, 8, 9, and 16 are GND; Pins 2 and 15 are COL (collector outputs, must be externally tied); Pin 3 is PGND (power ground with 25 nH target inductance); Pin 4 is SYNC; Pin 5 is CT; Pin 6 is RT; Pin 7 is FB; Pin 8 is NFB; Pin 9 is GND; Pin 10 is VC; Pin 11 is SHDN; Pin 12 is RCSL; Pin 13 is RVSL; Pin 14 is VIN; Pin 15 is COL; Pin 16 is PGND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| COL (Pins 2, 15) | Power switch collector output | Must be externally shorted; carries full 2A switch current; requires minimal trace inductance to limit EMI. |
| PGND (Pin 3, 16) | Power switch emitter return | Separate from signal GND; requires ~25 nH inductance (e.g., 1" trace) for stable slew control loop. |
| FB (Pin 7) | Positive output voltage sense input | Inverting input of transconductance error amp referenced to 1.25 V; regulates +VOUT via resistor divider. |
| NFB (Pin 8) | Negative output voltage sense input | Connects to inverting input of dedicated negative-feedback amp (gain = –0.5); regulates –VOUT to –2.5 V. |
| VC (Pin 10) | Error amplifier output / compensation node | Drives current comparator; accepts RC network for loop compensation, current limit adjustment, and soft-start. |
| SHDN (Pin 11) | Enable/disable control | Logic-low disables all circuitry; draws <20 µA in shutdown; compatible with open-drain or microcontroller GPIO. |
| RCSL (Pin 12) | Current slew rate programming | Resistor to GND sets dI/dt ≈ 33/RCSL (kΩ) A/µs; min 3.9 kΩ, max 68 kΩ. |
| RVSL (Pin 13) | Voltage slew rate programming | Resistor to GND sets dV/dt ≈ 220/RVSL (kΩ) V/µs; min 3.9 kΩ, max 68 kΩ. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI via slew control | Independent dV/dt and dI/dt programming reduces high-frequency harmonic power by up to 40 dB without major efficiency penalty. |
| Dual-polarity regulation | Simultaneous +VOUT (via FB) and –VOUT (via NFB) regulation using single IC; eliminates need for separate negative regulators. |
| Thermal-enhanced SO-16 | Fused corner pins connect directly to die paddle; θJA = 50°C/W enables reliable 2A operation without heatsink in compact layouts. |
| Robust protection suite | Cycle-by-cycle current limit, thermal shutdown (pulls VC low), and UVLO (2.55V threshold) ensure safe operation under fault conditions. |
| External clock synchronization | SYNC pin accepts square wave (≥1.4V, ≥0.5 µs pulse width) to align switching harmonics-critical for avoiding sensitive RF bands. |
Applications
| Medical Instrumentation Power | Precision Data Acquisition Supplies |
|---|---|
Use Scenario: Powering analog front-ends in portable ECG or EEG monitors where switching noise corrupts µV-level bio-signals. IC Role / Device Role / Timing Role: Low-noise boost regulator generating clean ±5V rails from a 3.3V Li-ion cell; slew-controlled edges suppress interference in ADC reference and op-amp bias paths. Use Value: Enables >100 dB SNR in clinical-grade acquisition without magnetic shielding or linear post-regulation. | Use Scenario: Supplying isolated sensor interfaces on single-board DAQ modules where EMI disrupts SPI/I²C communication. IC Role / Device Role / Timing Role: Dual-rail switching supply delivering ±15V to isolated instrumentation amplifiers and ±5V to digital logic; synchronized to system clock to avoid spectral overlap. Use Value: Eliminates need for discrete DC/DC + LDO cascades, reducing BOM count and board area while maintaining <10 µVpp output ripple. |
| Industrial Isolated Power | Wireless Baseband Power |
Use Scenario: Generating floating ±12V supplies for 4–20 mA loop transmitters in hazardous-area PLC I/O modules. IC Role / Device Role / Timing Role: Primary-side controller in flyback-derived topology; NFB pin regulates negative rail while FB regulates positive rail across isolation barrier. Use Value: Achieves CISPR-22 Class B emissions compliance without ferrite beads or common-mode chokes-reducing design iteration time. | Use Scenario: Powering RF transceiver bias circuits in cellular IoT gateways where switching noise degrades receiver sensitivity. IC Role / Device Role / Timing Role: Local boost converter supplying 5V to PA driver stages; slew rates tuned to suppress harmonics near LTE Band 13 (746–756 MHz) receive band. Use Value: Prevents desensitization of adjacent channel receivers by lowering conducted noise floor by 35 dBµV in 100 kHz–30 MHz range. |
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 | Higher input range (4–60V), no slew control, dual-output synchronous buck; requires external MOSFETs. | Designed for high-voltage industrial inputs; lacks integrated 2A switch and EMI-slew capability. | Select when input exceeds 23V or synchronous rectification is required; not suitable for ultralow-EMI designs. |
| TPS61088RHLR | Single-output boost only, no NFB pin, fixed 500kHz fSW, no slew programming; 3.2A switch. | Optimized for cost-sensitive consumer power; no negative rail support or harmonic placement control. | Choose for high-efficiency single-rail apps where EMI filtering is handled externally; cannot replace LT1534CS#PBF in dual-polarity or sync-critical systems. |
Compared with LTC3891EFE#PBF and TPS61088RHLR, the LT1534CS#PBF uniquely delivers integrated 2A slew-controlled switching with dual-polarity regulation in a thermally enhanced SO-16 package-making it irreplaceable for medical, test equipment, and RF-adjacent applications demanding sub-10 µVpp noise floors.
Availability
LT1534CS#PBF is available at Aetrix Electronics and suitable for precision instrumentation systems, isolated industrial supplies, medical instruments, and wireless communications infrastructure requiring stable component supply and long-term manufacturability.
Supply support for LT1534CS#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1534CS#PBF belongs to ADI's legacy Linear Technology switching regulator product line, engineered specifically for EMI-critical power conversion where harmonic content, dual-rail capability, and thermal reliability outweigh raw efficiency metrics.
FAQ
What is the maximum allowable input voltage for the LT1534CS#PBF?
The LT1534CS#PBF has an absolute maximum input voltage rating of 30V on the VIN pin. However, its recommended operating range is 2.7V to 23V per the datasheet. Operation above 23V risks exceeding internal LDO stress limits and may compromise long-term reliability-even if within absolute max ratings. Always maintain VIN ≤ 23V in production designs using LT1534CS#PBF.
Can the LT1534CS#PBF regulate both positive and negative outputs simultaneously?
Yes, the LT1534CS#PBF can regulate both polarities concurrently: the FB pin controls positive output voltage (referenced to +1.25V), while the NFB pin controls negative output voltage (referenced to –2.50V). When both pins are actively used, the IC prevents either rail from overvoltage, though load regulation symmetry is compromised. This dual-sense capability is intrinsic to LT1534CS#PBF's architecture and requires no external op-amps or level shifters.
How does the slew rate control function in the LT1534CS#PBF affect EMI performance?
The LT1534CS#PBF reduces high-frequency conducted and radiated EMI by up to 40dB through independent programming of voltage (RVSL) and current (RCSL) slew rates. Slower dV/dt and dI/dt edges lower harmonic energy above 30MHz, easing compliance with FCC Part 15 and CISPR standards. This is measured directly in LT1534CS#PBF evaluation circuits using near-field probes and spectrum analyzers-not inferred from efficiency curves.
What thermal considerations apply to the LT1534CS#PBF in SO-16 package?
The LT1534CS#PBF in the S package uses fused corner pins connected to the die paddle, achieving θJA = 50°C/W (vs. 100°C/W for standard SO-16). To maintain junction temperature ≤125°C, PCB land patterns must expand these four pins into thermal pads. Power dissipation calculations must include slew-dependent losses: PSLEW increases with slower edges, so thermal design must account for worst-case RVSL/RCSL settings-not just nominal 2A conduction loss.
Is the LT1534CS#PBF pin-compatible with the LT1534CS-1 variant?
No, the LT1534CS#PBF and LT1534CS-1 are not pin-compatible. The LT1534CS-1 uses a modified SO-16 pinout: GND replaces NC at Pin 1; PGND moves to Pin 3; and four GND pins (1, 8, 9, 16) are explicitly tied to the thermal paddle. LT1534CS#PBF retains NC at Pin 1 and uses Pins 1/8/9/16 as signal GND only. Layouts must be redesigned when substituting between these variants-LT1534CS#PBF cannot be drop-in replaced with LT1534CS-1.
LT1534CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LT1534CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1534CS#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 LT1534CS#PBF reliable?
The price and inventory of LT1534CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1534CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1534CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1534CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1534CS#PBF?
LT1534CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1534CS#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 LT1534CS#PBF?
For technical support, including LT1534CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1534CS#PBF requirements.
6.How does Aetrix verify that LT1534CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1534CS#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 LT1534CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1534CS#PBF?
All LT1534CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1534CS#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 LT1534CS#PBF part is unused and in its original packaging.
Return procedure for LT1534CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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