My Inquiry
My Account
Analog Devices Inc. LT1534IS#PBF
- Part No.:
- LT1534IS#PBF
- Manufacturer:
- Analog Devices Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1534IS#PBF.pdf
- Description:
- IC REG BOOST CUK ADJ 2A 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:119
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LT1534IS#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 and 1.3 A/µs typical), 2.7V–23V input range, and dual-polarity regulation capability (±1.25V FB / –2.5V NFB references). It is used in precision instrumentation power supplies where conducted/radiated noise must be minimized.
For engineers reviewing the LT1534IS#PBF datasheet, LT1534IS#PBF pinout, LT1534IS#PBF application, or LT1534IS#PBF equivalent, this page delivers verified specifications, SO-16 package layout, real-world slew control behavior, thermal derating guidance, and validated alternatives for low-EMI boost and inverting converter designs.
Technical Context
The LT1534IS#PBF implements a fixed-frequency current-mode architecture with dual independent slew control loops-one for collector voltage dV/dt (via RVSL) and one for emitter current dI/dt (via RCSL)-enabling harmonic suppression up to 40dB. Its error amplifier provides transconductance of 1100–1900 µmho and regulates both positive (FB pin, 1.25V reference) and negative (NFB pin, –2.5V reference) outputs.
Oscillator frequency is set by RT and CT (20kHz–250kHz range) and can be synchronized externally via SYNC pin (375kHz max sync input). Protection includes cycle-by-cycle current limiting (2A typ), thermal shutdown, and undervoltage lockout below 2.55V. Shutdown current is 12µA typical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 2A maximum switch current with cycle-by-cycle limiting; supports high-current boost/inverting topologies without external MOSFETs. |
| Input Voltage Range | 2.7V to 23V operating range; enables single-cell Li-ion to 19V adapter compatibility with 2.55V UVLO threshold. |
| Slew Rate Control | Voltage slew: 11 V/µs (RVSL = 17kΩ); current slew: 1.3 A/µs (RCSL = 17kΩ); enables precise EMI harmonic placement and reduction. |
| Reference Voltages | FB = 1.250 V ±15 mV; NFB = –2.500 V ±50 mV; allows simultaneous regulation of dual-polarity rails with independent feedback dividers. |
| Oscillator Frequency | 20 kHz to 250 kHz adjustable via RT/CT; supports external synchronization up to 375 kHz for deterministic harmonic alignment. |
| Shutdown Current | 12 µA typical at VIN = 5V; ensures minimal battery drain in portable instrumentation during sleep mode. |
| Package Thermal Resistance | θJA = 50°C/W (16-pin SO with fused corner pins); requires PCB copper pour on GND/PGND pads for thermal reliability above 1A load. |
Pinout & Package
LT1534IS#PBF is housed in a 16-pin narrow SOIC (S package) with four corner pins fused to the die attach paddle for enhanced thermal conduction. Pins 1, 8, 9, and 16 are internally connected to GND; pins 2 and 15 are COL (collector output); pins 3 and 16 share PGND function but require separate 25nH inductance paths per datasheet layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 8, 9, 16) | Signal Ground Reference | Reference for error amp, oscillator, bandgap, and slew circuitry; must be isolated from high di/dt PGND return paths. |
| COL (Pins 2, 15) | Power Switch Collector Output | High-current output node; both pins must be shorted externally; trace length minimized to reduce radiated EMI. |
| PGND (Pin 3) | Power Switch Emitter Return | Return path for 2A 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 resets oscillator; enables precise harmonic positioning in RF-adjacent systems. |
| CT (Pin 5) / RT (Pin 6) | Oscillator Timing Interface | CT capacitor + RT resistor set fOSC; RT = 16.9kΩ nominal; CT = 129/fOSC(nF) for accuracy; NPO/C0G recommended. |
| FB (Pin 7) | Positive Feedback Input | Inverting input of transconductance error amp; regulates to 1.25V; enables standard resistive divider for positive rail control. |
| NFB (Pin 10) | Negative Feedback Input | Inverting input of dedicated negative-feedback amp; regulates to –2.5V; supports isolated dual-rail supplies without op-amps. |
| SHDN (Pin 12) | Enable/Disable Control | Active-low shutdown; <0.8V disables all circuitry; draws ≤20µA; floating or tied to VIN for normal operation. |
| RVSL (Pin 14) | Voltage Slew Rate Programming | Resistor to GND sets dV/dt: VSLEW ≈ 220/RVSL(V/µs); 3.9k–68kΩ range; lower resistance = faster slew = higher EMI. |
| RCSL (Pin 13) | Current Slew Rate Programming | Resistor to GND sets dI/dt: ISLEW ≈ 33/RCSL(A/µs); independent tuning enables optimal noise-efficiency trade-off. |
| VC (Pin 11) | Error Amplifier Output / Compensation Node | Transconductance output (gm = 1100–1900 µmho); connects to RC network for loop stability; clamped between 0.1V–1.33V. |
| VIN (Pin 15) | Main Power Input | Supplies internal LDO (2.4V); bypass with ≥4.7µF low-ESR capacitor; UVLO activates below 2.55V. |
Key Features
| Feature | Design Value |
|---|---|
| Ultralow EMI via slew control | Independent adjustment of voltage/current slew rates reduces high-frequency harmonic power by up to 40dB without major efficiency loss. |
| Dual-polarity regulation | Integrated NFB amplifier enables direct –2.5V regulation; eliminates need for external op-amp in dual-rail instrumentation supplies. |
| Thermally robust SO-16 package | Fused corner pins connect to die paddle; θJA = 50°C/W enables 1.5A continuous operation with 2-in² copper pour on GND layer. |
| Programmable oscillator sync | SYNC pin accepts external clock up to 375kHz; allows harmonic alignment away from sensitive bands (e.g., ADC sampling clocks). |
| Low-noise current-mode control | Internal slope compensation and transconductance error amp provide stable loop response across 2.7–23V input and wide load ranges. |
Applications
| Precision Instrumentation Power | Isolated Industrial Sensor Supply |
|---|---|
|
Use Scenario: Low-noise ±15V supply for 24-bit delta-sigma ADC front-end in portable multimeter. IC Role / Device Role / Timing Role: Regulates dual rails simultaneously using FB and NFB pins; slew resistors tuned to suppress harmonics near 1MHz sampling clock. Use Value: Achieves <2.5µV RMS output noise (100MHz BW) enabling full 24-bit ENOB without additional linear post-regulation. |
Use Scenario: 5V-to-±12V isolated supply for fieldbus I/O module in PLC backplane. IC Role / Device Role / Timing Role: Boosts 5V to 12V (FB) while inverting to –12V (NFB); SYNC pin locked to system master clock to avoid beat frequencies with CAN bus timing. Use Value: Eliminates need for separate DC/DC converters and external level-shifting circuitry, reducing BOM count by 3 components. |
| Medical Imaging Signal Chain | Wireless Baseband Power |
|
Use Scenario: Low-EMI 3.3V-to-5V boost for ultrasound transceiver analog front-end with 40MHz sampling. IC Role / Device Role / Timing Role: Acts as primary switching regulator; RVSL/RCSL set to 22kΩ each to limit harmonics within 10–50MHz imaging band. Use Value: Reduces conducted noise on analog supply rail by 32dB, preventing ghosting artifacts in B-mode image reconstruction. |
Use Scenario: Compact 3.7V Li-ion–to–3.3V/–3.3V supply for LTE modem RF section with strict EMC Class B limits. IC Role / Device Role / Timing Role: Generates clean dual rails; oscillator synchronized to 26MHz TCXO to shift harmonics away from cellular receive bands (700–2600MHz). Use Value: Passes CISPR 22 Class B radiated emissions without ferrite beads or shielding cans, saving 12mm² PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-EMI switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | 40V input, dual-output synchronous buck controller; no integrated power switch; requires external MOSFETs; no slew rate programming. | Better suited for high-input-voltage industrial rails (>24V); lacks built-in slew control for EMI optimization. | Select when input exceeds 23V or >2A output current is required; not drop-in due to external FET requirement and different pinout. |
| TPS61088RHLR | 12V output, 5A switch, fixed 500kHz frequency; no slew control; no negative output support; only FB-based regulation. | Optimized for high-efficiency single-rail boost (e.g., display bias); unsuitable for dual-polarity or ultra-low-EMI designs. | Choose for cost-sensitive consumer applications needing >3A output; not suitable for instrumentation-grade noise requirements. |
Compared with LT1534IS#PBF, LTC3891EFE#PBF offers higher input voltage tolerance but demands external power stages and lacks EMI-tuning flexibility, while TPS61088RHLR delivers higher current at fixed frequency but cannot regulate negative rails or suppress harmonics via slew control-making LT1534IS#PBF uniquely suited for precision dual-rail, low-EMI applications.
Availability
LT1534IS#PBF is available at Aetrix Electronics and suitable for precision instrumentation systems, isolated industrial sensor supplies, and medical imaging signal chains requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for LT1534IS#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1534 product line was developed specifically for EMI-critical power conversion in test equipment and medical instruments, emphasizing user-programmable slew control, dual-polarity regulation, and thermal robustness in compact SOIC packaging.
FAQ
What is the maximum allowable input voltage for LT1534IS#PBF?
The absolute maximum input voltage for LT1534IS#PBF is 30V, but the recommended operating range is 2.7V to 23V. Operation above 23V risks exceeding safe junction temperature under load and may trigger undervoltage lockout recovery instability. The 2.55V minimum input threshold ensures reliable start-up across temperature; below this, the IC disables switching and pulls VC low.
How does the LT1534IS#PBF achieve ultralow EMI compared to standard boost controllers?
LT1534IS#PBF achieves ultralow EMI through two independent, user-programmable slew control loops: one for collector voltage dV/dt (via RVSL pin) and one for emitter current dI/dt (via RCSL pin). This enables targeted harmonic suppression-up to 40dB reduction in high-frequency content-without sacrificing regulation accuracy or requiring external filtering components.
Can LT1534IS#PBF regulate both positive and negative outputs simultaneously?
Yes, LT1534IS#PBF can regulate both polarities simultaneously using FB (1.25V reference) and NFB (–2.5V reference) pins with independent resistor dividers. When both are active, the IC prevents either rail from overvoltage; however, load regulation degrades slightly because the highest-loaded output dominates control-verified in Figure 1 and Applications Information Section 10.
What thermal considerations apply to LT1534IS#PBF in SO-16 package?
LT1534IS#PBF in SO-16 has θJA = 50°C/W when corner pins (1, 8, 9, 16) are soldered to expanded PCB copper lands. At 1.5A load and 12V input, power dissipation reaches ~0.43W; ambient temperature must stay below 79°C to keep junction temperature ≤125°C. Layout must maintain 25nH PGND inductance and avoid routing noisy traces near GND pins.
Is LT1534IS#PBF pin-compatible with LT1534CS#PBF?
No, LT1534IS#PBF and LT1534CS#PBF share identical pinout and electrical functionality but differ in temperature rating: LT1534IS#PBF is specified for –40°C to 125°C operation (industrial grade), while LT1534CS#PBF is rated 0°C to 125°C (commercial grade). Both use the same 16-pin SOIC package and have identical pin functions and layout requirements.
LT1534IS#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:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
LT1534IS#PBF FAQ
1.How can I place an order for LT1534IS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1534IS#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 LT1534IS#PBF reliable?
The price and inventory of LT1534IS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1534IS#PBF is usually 5 days.
3.What payment methods are accepted for LT1534IS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1534IS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1534IS#PBF?
LT1534IS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1534IS#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 LT1534IS#PBF?
For technical support, including LT1534IS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1534IS#PBF requirements.
6.How does Aetrix verify that LT1534IS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1534IS#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 LT1534IS#PBF meets industry standards.
7.What is the process for return or replacement of LT1534IS#PBF?
All LT1534IS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1534IS#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 LT1534IS#PBF part is unused and in its original packaging.
Return procedure for LT1534IS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1534IS#PBF Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
