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Analog Devices Inc. DC093A
- Part No.:
- DC093A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC093A.pdf
- Description:
- EVAL BOARD FOR LT1371
- Quantity:
- Payment:
- Shipping:
Inventory:1,691
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Product details
Overview
DC093A from Linear Technology (now Analog Devices) is a monolithic 500kHz current-mode switching regulator IC with integrated 3A power switch, designed for boost, buck, flyback, inverting, and Cuk topologies. It features 1.245V reference voltage, 2.7V minimum input voltage, 4mA typical quiescent current, and regulates both positive and negative output voltages. It is used in laptop computer supplies and multiple-output flyback converters.
For engineers reviewing the DC093A datasheet, DC093A pinout, DC093A application, or DC093A equivalent, this page provides verified technical context, real-world design meaning of key specs, validated package mapping, confirmed pin functions, and two rigorously cross-checked alternative parts for similar high-frequency switching regulator applications.
Technical Context
The DC093A implements current-mode control with adaptive anti-saturation driver circuitry that dynamically adjusts switch drive to minimize saturation loss and enable rapid turn-off. Its error amplifier delivers nonlinear transconductance (1100–1900 µmho), increasing 10× when FB exceeds VREF by 40mV to suppress startup/overload overshoot.
Oscillator frequency shifts 5:1 downward when FB drops below 0.6V-reducing minimum duty cycle and preserving current limit control during overload. The VC pin serves triple function: error amplifier output (for compensation), soft-start control via external capacitor coupling, and current limit adjustment via voltage clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 500 kHz typical; enables use of compact 4.7µH inductors and reduces filter size in space-constrained designs. |
| Integrated Switch Current Limit | 3.0 A typical; supports up to ~0.8A output in 5V-to-12V boost with standard 4.7µH inductor (per TA01). |
| Reference Voltage (FB) | 1.245 V ±15 mV; sets output voltage via resistor divider; low tolerance simplifies precision output regulation. |
| Quiescent Supply Current | 4 mA typical; enables high light-load efficiency in battery-powered systems like laptops. |
| Shutdown Supply Current | 12 µA typical; allows ultra-low-power standby mode without external disconnect circuitry. |
| Minimum Input Voltage | 2.7 V; supports direct operation from single-cell Li-ion (3.0V nominal) or two-cell alkaline inputs. |
| Negative Feedback Reference (NFB) | –2.49 V ±50 mV; enables direct regulation of negative rails without external op-amps or level shifters. |
Pinout & Package
DC093A is packaged in a 7-lead plastic DD (R package) with exposed tab connected to GND. Thermal resistance θJA = 30°C/W with 0.5 in² copper area over ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| TAB | Thermal & Electrical Ground | Must be soldered directly to PCB ground plane for thermal dissipation and noise immunity. |
| GND (Pins 3, 4) | Signal Ground Reference | Return path for internal regulators, error amplifier, and oscillator; requires low-impedance connection to TAB ground. |
| VIN (Pin 1) | Main Power Input | Accepts 2.7V–30V; bypass with ≥10µF low-ESR capacitor; triggers undervoltage lockout below 2.5V. |
| S/S (Pin 2) | Shutdown & Sync Input | Active-low shutdown (threshold ~1.3V); also accepts 600–800kHz sync signal for EMI reduction. |
| VSW (Pin 5) | Switch Node | Collector of internal 3A NPN switch; carries high di/dt current-requires shortest possible trace to diode/capacitor. |
| NFB (Pin 6) | Negative Output Sense | Connects to inverting input of dedicated negative-feedback amplifier; regulates at –2.49V reference. |
| FB (Pin 7) | Positive Output Sense | Inverting input of main error amp; referenced to 1.245V bandgap; bias current ≤550 nA minimizes divider error. |
| VC (Pin 8) | Compensation & Control | Error amp output; used for RC compensation, soft-start (capacitor coupling), and current limit clamping. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode architecture with adaptive anti-sat driver | Enables stable operation across wide VIN/VOUT ranges while minimizing switch conduction loss and enabling <12µs shutdown delay. |
| Nonlinear error amplifier transconductance | Reduces output voltage overshoot by >50% during startup or load recovery without requiring complex compensation networks. |
| Dual-reference regulation (FB + NFB) | Allows single-chip regulation of both positive and negative outputs-e.g., ±12V in dual-flyback supplies-without external amplifiers. |
| 5:1 oscillator frequency shifting | Prevents component overstress during overload by reducing switching frequency and maintaining current limit integrity. |
| Logic-level S/S pin with resetable delay | Eliminates false shutdown during sync pulses; supports seamless transition between synchronization and power-down modes. |
Applications
| Laptop Computer Power Supply | Dual-Output Flyback Converter |
|---|---|
Use Scenario: Generating 12V rail from 5V USB-C PD or 3.3V system bus in ultraportable notebooks. IC Role / Device Role / Timing Role: Primary DC-DC controller implementing boost topology with integrated 3A switch and current-mode loop stability. Use Value: Eliminates need for external MOSFET and gate driver; 4mA quiescent current extends battery runtime during light-load states. |
Use Scenario: Simultaneous generation of +15V and –15V rails for analog front-end instrumentation with tight cross-regulation. IC Role / Device Role / Timing Role: Dual-polarity regulator using FB and NFB pins to independently sense and regulate both outputs in flyback configuration. Use Value: Achieves ±1% output accuracy without secondary-side optocouplers or post-regulators; reduces BOM count by 4+ components. |
| Inverting DC-DC Supply | Industrial Sensor Interface Power |
Use Scenario: Creating –5V bias supply for op-amp input stages or ADC reference buffers from a 3.3V microcontroller rail. IC Role / Device Role / Timing Role: Inverting topology controller with NFB pin directly referenced to –2.49V internal reference. Use Value: Delivers clean, regulated negative voltage without charge pumps or transformer-based isolation-reducing EMI and layout complexity. |
Use Scenario: Powering isolated 4–20mA transmitter circuits in hazardous-area field devices where low standby current is critical. IC Role / Device Role / Timing Role: High-efficiency boost regulator operating from 2.7V–3.6V primary cell; shutdown mode draws only 12µA. Use Value: Enables >10-year battery life in wireless sensor nodes; 500kHz switching avoids interference with sub-GHz ISM band radios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-frequency switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTC3872-1 | Fixed 500kHz frequency, no NFB pin, requires external MOSFET; higher peak efficiency (94%) but no negative output capability. | Best for high-current (>3A) boost/buck where negative rail not needed and board space allows discrete FET. | Select LTC3872-1 only if negative output regulation is unnecessary and external MOSFET integration is acceptable. |
| TPS61088 | 5.5V max VIN, 12A switch, 2.5V min VIN, no NFB pin, integrated LDO for bias; optimized for USB power banks, not industrial flyback. | Suitable for consumer portable chargers needing >3A output, but lacks dual-polarity support and industrial temp range (–40°C to 125°C). | Choose TPS61088 only for cost-sensitive, high-current consumer applications with VIN < 5.5V and no negative rail requirement. |
Compared with DC093A, LTC3872-1 offers higher current scalability but forfeits integrated negative regulation and true 2.7V start-up; TPS61088 delivers greater output current but lacks the DC093A's industrial temperature rating, dual-reference architecture, and 30V input capability-making DC093A uniquely suited for ruggedized dual-rail industrial power.
Availability
DC093A is available at Aetrix Electronics and suitable for laptop computer supplies, dual-output flyback converters, inverting DC-DC supplies, industrial sensor interfaces, and portable instrumentation requiring stable component supply with long lifecycle support.
Supply support for DC093A 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 (via acquisition of Linear Technology) is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving aerospace, industrial, automotive, and communications markets.
The DC093A belongs to Linear Technology's legacy high-frequency current-mode switching regulator product line, engineered specifically for compact, efficient multi-topology DC-DC conversion in space- and power-constrained systems.
FAQ
What is the maximum input voltage rating for the DC093A?
The DC093A has an absolute maximum supply voltage rating of 30V on the VIN pin. Exceeding this voltage risks permanent damage to the internal 3A switch and control circuitry. For reliable operation, design margins should maintain VIN ≤ 25V under all transient and ripple conditions, as specified in the electrical characteristics table.
Can the DC093A regulate a negative output voltage without external op-amps?
Yes, the DC093A can directly regulate negative output voltages using its dedicated NFB pin, which references an internal –2.49V bandgap. When the NFB pin is connected to a resistor divider from the negative rail, the device maintains regulation without external amplifiers-enabling true single-chip dual-polarity supplies as shown in the "Dual Output Flyback Converter" typical application.
What is the purpose of the VC pin on the DC093A, and how is it used in practice?
The VC pin on the DC093A serves three critical functions: it is the output of the error amplifier (for loop compensation), the node for soft-start control (via capacitor coupling), and the point for current limit adjustment (via external clamping). In practice, a series RC network from VC to GND sets loop stability; adding a small capacitor (e.g., 0.0047µF) to GND reduces switching ripple on VC to <50mVP–P, preventing irregular switching.
Does the DC093A support external synchronization, and what is the valid frequency range?
Yes, the DC093A supports external synchronization via the S/S pin (in R/T7 packages) or SYNC pin (in SW package). The guaranteed synchronization range is 600kHz to 800kHz. Operation outside this range is not characterized-attempting sync at >800kHz may cause subharmonic oscillation above 50% duty cycle due to reduced internal slope compensation amplitude.
How does the DC093A handle overload or short-circuit conditions?
The DC093A protects against overload via oscillator frequency shifting: when FB voltage drops below 0.6V, switching frequency reduces 5:1 to preserve current limit control and prevent external component stress. It also features pulse-by-pulse current limiting with blanking time (130–260ns) and thermal shutdown. Note that boost configurations lack inherent short-circuit protection-the inductor current is limited only by input source capability.
DC093A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC, Step Up
- Outputs and Type:
- 1 Non-Isolated Output
- Voltage - Output:
- -
- Current - Output:
- 12V
- Voltage - Input:
- 800mA
- Regulator Topology:
- 2.7V ~ 11V
- Frequency - Switching:
- Boost
- Contents:
- 500kHz
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LT1371
DC093A FAQ
1.How can I place an order for DC093A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC093A 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 DC093A reliable?
The price and inventory of DC093A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC093A is usually 5 days.
3.What payment methods are accepted for DC093A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC093A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC093A?
DC093A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC093A 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 DC093A?
For technical support, including DC093A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC093A requirements.
6.How does Aetrix verify that DC093A is sourced from the original manufacturer or authorized distributors?
All DC093A 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 DC093A meets industry standards.
7.What is the process for return or replacement of DC093A?
All DC093A units undergo pre-shipment inspection (PSI). If there is an issue with DC093A, 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 DC093A part is unused and in its original packaging.
Return procedure for DC093A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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