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Analog Devices Inc. LT1683IG#TRPBF
- Part No.:
- LT1683IG#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- DC DC Switching Controllers
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
LT1683IG#TRPBF.pdf
- Description:
- IC REG CTRLR PUSH-PULL 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,475
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Product details
Overview
LT1683IG#TRPBF from Analog Devices (formerly Linear Technology) is an ultralow-noise, slew-rate-controlled push-pull DC/DC controller IC for EMI-sensitive power conversion. It features independent voltage/current slew control (VSLEWR = 26 V/µs, VISLEWR = 0.21 V/µs), dual N-channel gate drivers, 20–250 kHz oscillator, and dual-regulation capability for ± outputs. Used in precision instrumentation and medical power supplies where conducted/radiated EMI must be minimized.
For engineers reviewing the LT1683IG#TRPBF datasheet, LT1683IG#TRPBF pinout, LT1683IG#TRPBF application, or LT1683IG#TRPBF equivalent, key selection criteria include slew rate programmability via RVSL/RCSL, negative voltage regulation via NFB pin (–2.500 V reference), gate drive undervoltage lockout (VINUVLO = 7.5 V), soft-start current (ISS = 12 µA), and –40°C to 125°C industrial temperature grade.
Technical Context
The LT1683IG#TRPBF implements a fixed-frequency, current-mode push-pull architecture with dual error amplifiers-one for positive output regulation (FB, VREF = 1.250 V) and one for negative output regulation (NFB, VNFR = –2.500 V). Its slew control loops operate independently: voltage slew is set by RVSL and CAP A/B capacitors, while current slew is set by RCSL and the sense resistor RS.
Protection logic includes opposite-gate lockout (prevents cross-conduction), short-circuit fault response (CS ≥ 0.22 V discharges VC/SS), FB overvoltage shutdown (FBOV = 1.47 V), and gate drive UVLO tied to GCL pin voltage. The internal 5 V regulator (V5 = 5.00 V, ±5 mA) powers external circuitry and requires VIN ≥ 6.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | –40°C to 125°C - qualified for industrial and extended-temperature embedded power systems. |
| Oscillator Frequency | 20 kHz to 250 kHz - adjustable via RT/CT; supports synchronization to external clock up to 290 kHz. |
| Voltage Slew Rate | 26 V/µs rising, 19 V/µs falling - programmable via RVSL; reduces high-frequency harmonic content by up to 40 dB. |
| Current Slew Rate | 0.21 V/µs on CS pin - set by RCSL; enables controlled di/dt to suppress radiated EMI without major efficiency loss. |
| Reference Voltage (FB) | 1.250 V ±15 mV - precise bandgap reference enabling <±1% output regulation accuracy with proper feedback divider. |
| Negative Ref (NFB) | –2.500 V ±50 mV - allows direct regulation of negative rails without external op-amps or level-shifting circuitry. |
| Gate Drive Capability | ≥300 mA sink/source per driver - drives N-MOSFET gates directly; VGON = 10.4 V, VGOFF = 0.35 V at VIN = 12 V. |
| Soft-Start Current | 12 µA typical - charges external SS capacitor linearly to ramp peak switch current and prevent inrush. |
Pinout & Package
LT1683IG#TRPBF is housed in a 20-lead plastic SSOP (G package), 0.65 mm pitch, with exposed pad for thermal performance. Pin 1 is GATE A; pin 20 is PGND. Package dimensions: 7.2 mm × 5.3 mm × 1.75 mm (max).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GATE A (1) | High-side N-MOSFET gate driver output | Drives external MOSFET in push-pull pair; alternates conduction with GATE B; 300 mA capable. |
| CAP A (2) | Voltage slew feedback node | Connects to MOSFET drain via 1–5 pF capacitor; sets dV/dt with RVSL; critical for EMI reduction. |
| GCL (3) | Gate clamp & UVLO control input | Sets max gate voltage (VGCL – 0.2 V) and enables gate drive UVLO; internal 19 V Zener protection. |
| CS (4) | Current sense amplifier input | Monitors RS voltage for current-mode control and slew limiting; trip at 103 mV (current limit), 300 mV (fault). |
| V5 (5) | On-chip 5 V regulator output | Supplies 10 mA (source/sink); requires VIN ≥ 6.5 V; bypass with <1 µF capacitor if used. |
| SYNC (6) | External clock synchronization input | Accepts TTL/CMOS clock; locks oscillator phase to reduce spectral spreading of harmonics. |
| CT (7) | Oscillator timing capacitor connection | With RT, sets fOSC; COSC = 129 / fOSC(kHz) nF (e.g., 517 pF for 250 kHz). |
| RT (8) | Oscillator timing resistor connection | Sets oscillator charge/discharge current; nominal 16.9 kΩ; ±25% trim for frequency accuracy. |
| FB (9) | Positive output voltage feedback input | Inverting input to transconductance error amp; referenced to 1.250 V; enables ±1% regulation. |
| NFB (10) | Negative output voltage feedback input | Connects to inverting input of dedicated negative-feedback amp; regulates to –2.500 V. |
| GND (11) | Signal ground reference | Reference for error amps, oscillator, V5, bandgap; must be isolated from high-current PGND paths. |
| VC (12) | Error amp output / compensation node | Drives current comparator; used for loop compensation (RC to GND); clamped 0.25–1.27 V normal range. |
| SS (13) | Soft-start control input | Internal 12 µA current source charges external cap; limits VC during startup; discharged on short-circuit. |
| SHDN (14) | Shutdown enable input | Active-high; turn-on threshold 1.39 V; 110 mV hysteresis; sources 24 µA above threshold for external hysteresis. |
| RCSL (15) | Current slew rate programming resistor | Resistor to GND sets dI/dt slew; 3.3 kΩ–68 kΩ range; determines time constant with RS and load current. |
| RVSL (16) | Voltage slew rate programming resistor | Resistor to GND sets dV/dt slew; same 3.3 kΩ–68 kΩ range; works with CAP A/B capacitance. |
| VIN (17) | Main supply input | Powers all internal circuitry including gate drivers and V5; absolute max 20 V; UVLO at 7.5 V. |
| CAP B (18) | Second voltage slew feedback node | Matches CAP A for second MOSFET drain; enables symmetric slew control in push-pull topology. |
| GATE B (19) | Low-side N-MOSFET gate driver output | Complementary to GATE A; toggles on alternate oscillator cycles; prevents shoot-through with lockout. |
| PGND (20) | Power ground return | Carries gate drive return current (hundreds of mA pulses); must be routed separately from signal GND. |
Key Features
| Feature | Design Value |
|---|---|
| Independent slew rate control | Separate RVSL (voltage) and RCSL (current) pins allow simultaneous optimization of EMI suppression and efficiency. |
| Dual-output regulation | Integrated NFB amplifier enables stable negative rail regulation without external components-reduces BOM count and layout complexity. |
| Push-pull gate drivers | Two matched 300 mA drivers with opposite-gate lockout eliminate cross-conduction risk in transformer-coupled topologies. |
| Synchronization capability | SYNC pin accepts external clock up to 290 kHz, enabling deterministic harmonic placement for EMI compliance testing. |
| Robust protection suite | Includes CS fault discharge (VC/SS), FB/NFB overvoltage shutdown, gate UVLO, soft-start reset, and internal 19 V GCL clamp. |
| Industrial temperature grade | Guaranteed operation from –40°C to 125°C (Junction), validated across full range-not just characterized. |
Applications
| Medical Imaging Power Supplies | Precision Data Acquisition Systems |
|---|---|
|
Use Scenario: High-resolution MRI or CT detector front-ends requiring ultra-low-noise ±15 V and +5 V rails. IC Role / Device Role / Timing Role: Primary DC/DC controller managing push-pull isolation stage; regulates both polarities simultaneously using FB and NFB pins. Use Value: 40 dB harmonic reduction eliminates need for bulky EMI filters near sensitive analog signal chains, preserving SNR. |
Use Scenario: 24-bit ADC reference and bias supplies in portable test equipment operating from 48 V bus. IC Role / Device Role / Timing Role: Low-noise buck-derived converter generating clean ±5 V for precision op-amps and references. Use Value: Independent slew control (VSLEWR = 26 V/µs, VISLEWR = 0.21 V/µs) suppresses switching artifacts that would otherwise alias into measurement bandwidth. |
| EMI-Compliant Industrial PLC Power | Noise-Sensitive Communication Equipment |
|
Use Scenario: DIN-rail mounted 24 V input power module meeting EN 55032 Class B conducted emissions limits. IC Role / Device Role / Timing Role: Controller for discrete MOSFET-based forward or push-pull converter feeding downstream LDOs. Use Value: Reduced need for external LC filters cuts bill-of-materials cost and improves thermal reliability under full-load conditions. |
Use Scenario: Baseband processing board in 5G small cell radio requiring low-phase-noise clocking and clean analog supply. IC Role / Device Role / Timing Role: Secondary-side controller generating isolated ±12 V for RF front-end bias and DAC/ADC supplies. Use Value: Synchronization to system clock (via SYNC pin) aligns switching harmonics away from critical IF bands, easing filtering design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC/DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3891EFE#PBF | Single-output, high-voltage (60 V) synchronous buck controller; no slew control; no NFB capability. | Best for high-input-voltage step-down only; lacks dual-polarity regulation and EMI-slew features. | Choose LTC3891EFE#PBF when input > 40 V and noise requirements are moderate; avoid for ± rail or strict EMI targets. |
| LM5116MH/NOPB | Wide-input (6–100 V) synchronous buck controller; no slew rate control; no negative regulation; no SYNC pin. | Targeted at automotive and industrial high-VIN buck; no support for push-pull or isolated topologies. | Choose LM5116MH/NOPB for cost-sensitive, high-VIN non-isolated designs where EMI is managed externally. |
Compared with LTC3891EFE#PBF and LM5116MH/NOPB, the LT1683IG#TRPBF uniquely delivers programmable slew control, dual-polarity regulation, and push-pull gate drive in a single IC-making it irreplaceable for low-EMI isolated or bipolar supply designs where harmonic suppression is mandatory.
Availability
LT1683IG#TRPBF is available at Aetrix Electronics and suitable for medical instrumentation, precision data acquisition, and industrial automation power supplies requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LT1683IG#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LT1683IG#TRPBF belongs to ADI's legacy Linear Technology power management portfolio, specifically designed for ultra-low-noise, EMI-conscious DC/DC conversion in precision analog and safety-critical systems.
FAQ
What is the maximum allowable input voltage for LT1683IG#TRPBF?
The absolute maximum supply voltage (VIN) for LT1683IG#TRPBF is 20 V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent damage. For reliable long-term function, VIN should remain ≤18 V under transient conditions, and the gate drive undervoltage lockout activates below 7.5 V to prevent erratic switching.
How does the LT1683IG#TRPBF regulate negative output voltages?
The LT1683IG#TRPBF regulates negative outputs using its dedicated NFB pin, which connects to the inverting input of an internal amplifier with –0.5 gain. This causes the NFB pin to regulate at –2.500 V (typical), while the amplifier drives the FB pin to 1.250 V internally-enabling closed-loop control without external op-amps or level shifters.
Can LT1683IG#TRPBF be used in a non-isolated buck configuration?
Yes, LT1683IG#TRPBF can be used in non-isolated buck configurations, but it is optimized for push-pull and transformer-coupled topologies. In buck mode, only GATE A or GATE B is used, requiring external logic to disable the unused driver; slew control remains fully functional via CAP A/B and RVSL/RCSL.
What is the purpose of the GCL pin on LT1683IG#TRPBF?
The GCL pin on LT1683IG#TRPBF serves two critical functions: (1) it sets the maximum gate drive voltage (≈VGCL – 0.2 V when tied to Zener), protecting MOSFET gates; and (2) it enables gate drive undervoltage lockout-ensuring drivers remain off until VIN exceeds VGCL + 0.8 V during startup.
Does LT1683IG#TRPBF support synchronization to external clocks?
Yes, LT1683IG#TRPBF supports synchronization via its SYNC pin, which accepts TTL/CMOS-level clocks from 290 kHz down to match the internal oscillator frequency. This allows precise placement of switching harmonics to avoid sensitive frequency bands-critical for EMI compliance in communication and instrumentation systems.
LT1683IG#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
LT1683IG#TRPBF FAQ
1.How can I place an order for LT1683IG#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1683IG#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 LT1683IG#TRPBF reliable?
The price and inventory of LT1683IG#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1683IG#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1683IG#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1683IG#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1683IG#TRPBF?
LT1683IG#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1683IG#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 LT1683IG#TRPBF?
For technical support, including LT1683IG#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1683IG#TRPBF requirements.
6.How does Aetrix verify that LT1683IG#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1683IG#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 LT1683IG#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1683IG#TRPBF?
All LT1683IG#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1683IG#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 LT1683IG#TRPBF part is unused and in its original packaging.
Return procedure for LT1683IG#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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