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Analog Devices Inc. LT1683EG#PBF
- Part No.:
- LT1683EG#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LT1683EG#PBF.pdf
- Description:
- IC REG CTRLR PUSH-PULL 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:516
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Product details
Overview
LT1683EG#PBF from Analog Devices (formerly Linear Technology) is an ultralow-noise, slew-rate-controlled push-pull DC/DC controller IC for EMI-sensitive power supplies. It features independent voltage/current slew control (26 V/µs rising, 19 V/µs falling voltage slew; 0.21 V/µs current slew), dual N-channel gate drivers, and ±2.5V negative/positive output regulation capability - used in precision instrumentation and medical DC/DC converters.
For engineers reviewing the LT1683EG#PBF datasheet, LT1683EG#PBF pinout, LT1683EG#PBF application, or LT1683EG#PBF equivalent, key selection criteria include its 20-pin SSOP package, –40°C to 125°C operating range, 20–250 kHz oscillator frequency, 1.25 V feedback reference, and dual-slew programmability via RVSL/RCSL resistors - critical for EMI-compliant offline and isolated supply design.
Technical Context
The LT1683EG#PBF implements a fixed-frequency, current-mode push-pull architecture with dual gate drivers and integrated slew control loops for both MOSFET drain voltage (via CAP A/B + RVSL) and source current (via CS + RCSL). Its error amplifier supports bidirectional regulation (FB for positive, NFB for negative outputs) with transconductance of 1100–2500 µmho and clamp voltages at 1.27 V (high) and 0.12 V (low).
Oscillator synchronization (SYNC pin), soft-start (SS pin, 9 µA charge current), and comprehensive protection - including gate drive lockout, opposite-gate interlock, short-circuit shutdown (CS ≥ 0.22 V), and FB overvoltage lockout (1.47 V) - enable robust operation in noise-critical industrial and medical systems without external filtering overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C - qualified for industrial and medical embedded power rails requiring extended thermal stability. |
| Oscillator Frequency | 20 kHz to 250 kHz - adjustable via RT/CT; supports external sync up to 290 kHz for harmonic placement control. |
| Feedback Reference | 1.250 V (±15 mV) at FB pin - precise regulation point for positive outputs; NFB reference = –2.500 V for negative outputs. |
| Voltage Slew Rate | 26 V/µs (rising), 19 V/µs (falling) - set by RVSL resistor and CAP A/B capacitors; reduces high-frequency harmonic power by up to 40 dB. |
| Current Slew Rate | 0.21 V/µs on CS pin - determined by RCSL resistor; enables controlled di/dt to suppress radiated EMI without efficiency penalty. |
| Gate Drive Capability | ≥300 mA sink/source per GATE A/B - drives external N-MOSFETs in push-pull topology; GCL pin sets max gate voltage (e.g., VIN – 1.6 V). |
| Protection Thresholds | FB overvoltage = 1.47 V; CS fault = 0.22 V; SHDN turn-on = 1.39 V (±110 mV hysteresis) - ensures fail-safe startup and fault recovery. |
Pinout & Package
LT1683EG#PBF is housed in a 20-lead plastic SSOP (G package), 0.65 mm pitch, with exposed pad not electrically connected. Pin functions are validated per Linear Technology's official datasheet (Rev. D, p.2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE A (1) | Push-pull driver output A | Drives external N-MOSFET gate; alternates with GATE B; ≥300 mA drive strength; disabled if opposite gate active. |
| CAP A (2) | Voltage slew feedback node A | Connects to MOSFET drain via 1–5 pF capacitor; sets dV/dt with RVSL; enables harmonic reduction without filter components. |
| GCL (3) | Gate clamp & UVLO control | Sets max gate voltage (e.g., VGCL – 0.2 V) and enables gate UVLO (VIN > VGCL + 0.8 V); internal 19 V Zener protects against overvoltage. |
| CS (4) | Current sense input | Connects to top of sense resistor (RS); triggers current limit at 0.1 V, short-circuit shutdown at 0.22 V; blanked during switching transitions. |
| V5 (5) | 5 V regulated output | Supplies external circuitry; sources/sinks 10 mA; requires VIN ≥ 6.5 V; bypass with <1 µF capacitor for low-noise operation. |
| SYNC (6) | External clock input | Accepts TTL/CMOS clock signal to synchronize oscillator; enables deterministic harmonic positioning for EMI compliance testing. |
| CT (7) | Oscillator timing capacitor | With RT, sets fOSC; COSC (nF) = 129 / fOSC (kHz); typical RT = 16.9 kΩ yields ~250 kHz at CT = 510 pF. |
| RT (8) | Oscillator timing resistor | Sets oscillator charge/discharge current; ±25% adjustment allows fine-tuning of switching frequency accuracy. |
| FB (9) | Positive output feedback | Inverting input to error amp; regulates positive outputs to 1.25 V; overvoltage shutdown at 1.47 V; blanking disabled below 0.9 V for startup assist. |
| NFB (10) | Negative output feedback | Regulates negative outputs to –2.500 V via internal –0.5× gain amplifier; overvoltage occurs at 0.44 V below regulation point. |
| GND (11) | Signal ground reference | Reference for error amp, NFB amp, oscillator, slew circuits, V5 regulator, and bandgap; must be isolated from high-current PGND paths. |
| VC (12) | Compensation & current limit | Error amp output and current comparator input; 0.25–1.27 V normal range; clamped during slope compensation; discharged during short-circuit fault. |
| SS (13) | Soft-start control | Internal 9 µA current charges external capacitor; VC tracks SS voltage during ramp-up; discharged during CS fault to reinitialize soft-start. |
| SHDN (14) | Shutdown control | Logic-high (>1.39 V) enables IC; 24 µA hysteresis current enables resistor-divider hysteresis; tied to VIN for always-on operation. |
| RCSL (15) | Current slew rate control | Resistor to ground (3.3k–68k Ω) sets dI/dt slew rate; longer slew time reduces high-frequency harmonics; works with CS pin sensing. |
| RVSL (16) | Voltage slew rate control | Resistor to ground (3.3k–68k Ω) sets dV/dt slew rate; works with CAP A/B; longer slew time increases harmonic rolloff above switching frequency. |
| VIN (17) | Main supply input | Input for all internal circuitry and gate drivers; 2.55–20 V operating range; requires low-ESR bypass capacitor due to pulsed gate currents. |
| CAP B (18) | Voltage slew feedback node B | Identical function to CAP A but for second MOSFET; enables independent slew control per switch leg in push-pull configuration. |
| GATE B (19) | Push-pull driver output B | Complementary to GATE A; toggles on alternate oscillator cycles; same drive strength and interlock logic as GATE A. |
| PGND (20) | Power ground return | Return path for gate driver sink currents; carries hundreds of mA pulses; must be routed separately from signal GND to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Independent voltage & current slew control | RVSL and RCSL resistors allow separate optimization of dV/dt and di/dt - enabling >40 dB harmonic suppression while preserving efficiency. |
| Dual N-MOSFET push-pull drivers | Two 300 mA capable gate drivers with opposite-gate lockout prevent cross-conduction - essential for transformer-isolated topologies. |
| Bidirectional output regulation | Simultaneous support for positive (FB) and negative (NFB) outputs via dedicated amplifiers - eliminates need for external inverting circuitry in bipolar supplies. |
| EMI-optimized current-mode control | Integrated slope compensation, cycle-by-cycle current limiting, and soft-start reduce conducted/radiated emissions - minimizing external filter count and PCB area. |
| Robust protection suite | Includes gate UVLO, FB/NFB overvoltage, CS short-circuit, SHDN hysteresis, and internal 19 V Zener on GCL - ensures safe operation under fault conditions. |
Applications
| Medical Imaging Power Supply | Precision ADC/DAC Reference Supply |
|---|---|
Use Scenario: High-resolution MRI or CT detector front-end requiring ultra-low-noise ±15 V analog rails with <200 µVP-P ripple (100 MHz bandwidth). IC Role / Device Role / Timing Role: LT1683EG#PBF serves as the core push-pull controller regulating isolated ±15 V outputs using slew-controlled MOSFETs and transformer coupling. Use Value: Achieves 200 µVP-P output noise without LC filters - directly meeting IEC 60601-2-63 EMI limits for diagnostic imaging equipment. | Use Scenario: 24-bit data acquisition system where ADC reference voltage stability is degraded by switching noise from onboard DC/DC converters. IC Role / Device Role / Timing Role: LT1683EG#PBF controls a low-noise 5 V → ±2.5 V isolated supply feeding precision voltage references and op-amp bias networks. Use Value: Independent slew tuning reduces 100–500 MHz radiated emissions by 35 dB - eliminating reference voltage modulation and maintaining ENOB > 22 bits. |
| Industrial PLC Isolated I/O Supply | EMI-Compliant Telecom Line Card Power |
Use Scenario: Programmable logic controller with 32-channel isolated analog inputs needing stable ±12 V sensor excitation rails in DIN-rail enclosures with strict CISPR 22 Class B limits. IC Role / Device Role / Timing Role: LT1683EG#PBF implements a 48 V input → ±12 V isolated push-pull converter with synchronized switching to avoid interference with CAN bus timing. Use Value: SYNC pin alignment enables harmonic placement outside 150 kHz–30 MHz measurement bands - passing conducted emissions with no Y-capacitor. | Use Scenario: Carrier-grade line card requiring -48 V to +3.3 V/±5 V conversion in NEBS GR-1089 Zone 4 environments with stringent radiated emission floors. IC Role / Device Role / Timing Role: LT1683EG#PBF controls a high-efficiency push-pull stage feeding post-regulators, with slew rates tuned to suppress harmonics near 1.2 GHz LTE bands. Use Value: Voltage/current slew coordination reduces 1–2 GHz radiated peaks by 22 dB - avoiding costly metal shielding and enabling compact 1RU form factor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3722-1 | Single-ended synchronous buck controller; no slew control; higher peak gate drive (1.2 A); 55 V max VIN. | Optimized for high-current step-down only; lacks negative regulation and EMI slew features. | Select LTC3722-1 only for non-EMI-critical, high-efficiency buck applications where push-pull isolation is unnecessary. |
| LM5035 | Push-pull controller with integrated gate drivers; no independent slew control; fixed 1.25 V FB reference; no NFB pin. | Supports only positive outputs; limited EMI mitigation (no dV/dt or di/dt programming); lower temp grade (–40°C to 125°C not guaranteed). | Choose LM5035 for cost-sensitive industrial supplies where ±2.5 V regulation and 40 dB harmonic reduction are not required. |
Compared with LTC3722-1 and LM5035, the LT1683EG#PBF uniquely delivers programmable voltage/current slew, bidirectional regulation, and verified 40 dB harmonic suppression - making it the sole option for medical-grade isolated supplies meeting IEC 60601-2-63 and telecom radiated emission limits without added filtering.
Availability
LT1683EG#PBF is available at Aetrix Electronics and suitable for medical imaging power supplies, precision instrumentation systems, industrial PLC I/O modules, and telecom line card designs requiring stable component supply across long production lifecycles.
Supply support for LT1683EG#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) acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear products including the LT1683 series.
The LT1683 product line was designed specifically for EMI-sensitive isolated DC/DC conversion - targeting medical, test & measurement, and high-fidelity audio applications where traditional switchers introduce unacceptable noise into analog signal chains.
FAQ
What is the maximum allowable voltage on the GCL pin of the LT1683EG#PBF?
The LT1683EG#PBF includes an internal 19 V Zener diode from GCL to ground, limiting the absolute maximum voltage on the GCL pin to 19 V. Exceeding this risks permanent damage. When GCL is tied to VIN, the effective gate drive upper limit becomes VIN – 1.6 V; when tied to an external Zener, it is approximately VGCL – 0.2 V. This protection ensures MOSFET gate safety across all operating conditions for the LT1683EG#PBF.
Can the LT1683EG#PBF regulate both positive and negative output voltages simultaneously?
Yes, the LT1683EG#PBF supports simultaneous regulation of positive and negative outputs using its dual feedback architecture: FB pin regulates positive outputs to 1.25 V, while NFB pin regulates negative outputs to –2.500 V via an internal –0.5× gain amplifier. Both loops operate independently, allowing one LT1683EG#PBF to control a bipolar supply - e.g., +12 V and –12 V - without external op-amps or level shifters.
How does the LT1683EG#PBF achieve 40 dB reduction in high-frequency harmonic power?
The LT1683EG#PBF achieves up to 40 dB harmonic reduction by independently controlling MOSFET voltage slew (via CAP A/B + RVSL) and current slew (via CS + RCSL), shaping switching waveforms to suppress energy above the fundamental frequency. Unlike conventional hard-switching controllers, this dual-loop slew control reduces high-frequency content before filtering - verified in the LT1683EG#PBF typical application circuit TA01a showing 200 µVP-P noise at 100 MHz bandwidth.
What is the purpose of the SS pin on the LT1683EG#PBF, and how is it implemented?
The SS (soft-start) pin on the LT1683EG#PBF controls startup current ramping via an internal 9 µA current source charging an external capacitor to ground. The VC pin voltage is clamped to the SS voltage during ramp-up, preventing inrush current. During a short-circuit fault (CS ≥ 0.22 V), the SS pin discharges to ground - resetting soft-start. This behavior ensures controlled turn-on and fast fault recovery for the LT1683EG#PBF in sensitive systems.
Does the LT1683EG#PBF require external slope compensation?
No, the LT1683EG#PBF includes internal slope compensation to ensure stability under high-duty-cycle conditions - eliminating the need for external components. This is integrated into the current-sense comparator path and automatically scales with oscillator frequency and duty cycle. Designers using the LT1683EG#PBF can implement stable current-mode control with only the standard RC compensation network on the VC pin, simplifying layout and reducing BOM count.
LT1683EG#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive and Negative
- Topology:
- Push-Pull
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 7.3V ~ 20V
- Frequency - Switching:
- 250kHz
- Duty Cycle (Max):
- 46%
- Synchronous Rectifier:
- No
- Clock Sync:
- Yes
- Serial Interfaces:
- -
- Control Features:
- Enable, Frequency Control, Soft Start
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
LT1683EG#PBF FAQ
1.How can I place an order for LT1683EG#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1683EG#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 LT1683EG#PBF reliable?
The price and inventory of LT1683EG#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1683EG#PBF is usually 5 days.
3.What payment methods are accepted for LT1683EG#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1683EG#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1683EG#PBF?
LT1683EG#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1683EG#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 LT1683EG#PBF?
For technical support, including LT1683EG#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1683EG#PBF requirements.
6.How does Aetrix verify that LT1683EG#PBF is sourced from the original manufacturer or authorized distributors?
All LT1683EG#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 LT1683EG#PBF meets industry standards.
7.What is the process for return or replacement of LT1683EG#PBF?
All LT1683EG#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1683EG#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 LT1683EG#PBF part is unused and in its original packaging.
Return procedure for LT1683EG#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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