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Analog Devices Inc. DC1988A
- Part No.:
- DC1988A
- Manufacturer:
- Analog Devices Inc.
- Package:
- Datasheet:
-
DC1988A.pdf
- Description:
- EVAL BOARD FOR LTM8058
- Quantity:
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Product details
Overview
DC1988A from Analog Devices is an isolated µModule DC/DC converter with integrated LDO post-regulator, delivering up to 440mA at VOUT1 (2.5V–13V) and 300mA at VOUT2 (1.2V–12V), featuring 2kV AC galvanic isolation, current-mode control, and programmable soft-start. It operates from 3.1V to 31V input and is used in industrial sensors and ground-loop mitigation circuits requiring clean, isolated power rails.
For engineers reviewing the DC1988A datasheet, DC1988A pinout, DC1988A application, or DC1988A equivalent, key selection considerations include its dual-output architecture (isolated flyback + low-noise LDO), BGA package thermal performance, UL60950 recognition, and resistor-programmable output voltages - all critical for noise-sensitive isolated supply designs.
Technical Context
The DC1988A implements a current-mode controlled flyback topology with integrated transformer and power switches, enabling stable regulation across wide input ranges without external compensation. Its secondary-side LDO uses micropower quiescent current and reverse-voltage protection, with output noise reduced to 20µVRMS (100Hz–100kHz) via optional 0.01µF BYP capacitor.
Isolation is verified per UL60950 with 3kV DC hi-pot testing (1s duration), supporting 2kV AC working voltage. The device features programmable undervoltage lockout via RUN pin, adjustable soft-start via SS pin, and dual resistor-based output programming (ADJ1 for VOUT1, ADJ2 for VOUT2), with BIAS pin enabling efficiency optimization at low VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.1V to 31V DC - supports wide industrial input sources including 5V, 12V, 24V rails and battery-backed systems. |
| VOUT1 Output Range | 2.5V to 13V - set by single resistor (ADJ1), enabling flexible primary isolated rail generation. |
| VOUT2 Output Range | 1.2V to 12V - linear post-regulator output, adjustable via ADJ2 resistor, for ultra-low-noise analog or sensor supplies. |
| Max Output Current | 440mA at VOUT1 (VIN=24V, VOUT1=2.5V); 300mA at VOUT2 - defines maximum load capability before thermal derating. |
| Isolation Rating | 2kV AC (tested at 3kV DC, 1s) - enables safe separation between primary and secondary domains in medical, industrial, and test equipment. |
| Package Dimensions | 9mm × 11.25mm × 4.92mm BGA - compact thermally enhanced overmolded module compatible with automated SMT assembly. |
| Operating Temp | –40°C to 125°C internal junction - validated for harsh industrial environments with full spec compliance. |
Pinout & Package
The DC1988A is housed in a 38-lead overmolded BGA package (9mm × 11.25mm × 4.92mm) with SnPb or RoHS-compliant finish, optimized for thermal dissipation through GND and VOUT– pads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT1 (Bank 1) | Isolated flyback output positive | Primary regulated output; requires external capacitor to VOUT–; max 16V relative to VOUT–. |
| VOUT– (Bank 2) | Common return for VOUT1 and VOUT2 | Galvanically isolated ground reference; critical thermal path; must be connected to large copper area. |
| VOUT2 (Bank 3) | LDO post-regulator output | Low-noise secondary output; load and capacitor connect between VOUT2 and VOUT–. |
| GND (Bank 4) | Primary-side local ground | Reference for VIN, RUN, ADJ1, SS, BIAS; shares thermal path with VOUT–; requires robust PCB copper. |
| VIN (Bank 5) | Main input supply | Supplies internal regulator and power switch; requires ≥2.2µF local ceramic bypass capacitor. |
| ADJ2 (A2) | VOUT2 feedback input | Sets VOUT2 via resistor to VOUT–; clamped ±7V; 1.22V reference enables 1.2V–12V adjustment. |
| BYP (B2) | LDO reference bypass | Connects 0.01µF cap to VOUT2 to reduce output noise to 20µVRMS; floating if unused. |
| RUN (F3) | Enable/disable control | Resistive divider sets UVLO threshold (1.24V typical); draws 2.5µA below threshold. |
| ADJ1 (G7) | VOUT1 feedback input | Sets VOUT1 via resistor to GND; uses exponential equation for temperature-compensated regulation. |
| BIAS (H5) | Internal circuitry bias supply | Accepts 3.1V–15V external source (≤VIN) to improve efficiency; requires ≥4.7µF low-ESR capacitor. |
| SS (H6) | Soft-start timing node | Capacitor to GND controls output ramp rate and inrush; ~10µA sourced during startup. |
Key Features
| Feature | Design Value |
|---|---|
| 2kV AC galvanic isolation | Enables safe signal/power domain separation in industrial I/O, PLCs, and test equipment without external isolation components. |
| Dual-resistor output programming | Eliminates need for precision DACs or digital interfaces - VOUT1 and VOUT2 each set by one external resistor. |
| Integrated LDO post-regulator | Delivers 300mA at <430mV dropout with 20µVRMS noise (100Hz–100kHz), ideal for ADC references and RF front-ends. |
| Programmable soft-start | Reduces inrush current and output overshoot via external SS capacitor - critical for reliable hot-plug operation. |
| UL60950 recognized (E464570) | Validates safety compliance for end-equipment certification, reducing system-level qualification effort. |
Applications
| Industrial Sensors | Industrial Switches |
|---|---|
Use Scenario: Isolated power for 4–20mA loop-powered pressure/temperature transmitters in factory automation. IC Role / Device Role / Timing Role: Provides galvanically isolated 5V/3.3V rails for sensor signal conditioning and microcontroller, eliminating ground loops. Use Value: Enables accurate analog measurements by breaking ground potential differences between field devices and control cabinets. | Use Scenario: Powering Ethernet switch PHYs and management controllers in DIN-rail mounted industrial switches. IC Role / Device Role / Timing Role: Generates isolated 3.3V for PHY interface and 1.2V for CPU core, meeting EMC and safety requirements. Use Value: Integrates isolation, regulation, and low-noise LDO in one BGA package - reduces board space vs discrete solutions. |
| Ground Loop Mitigation | Test & Measurement Equipment |
Use Scenario: Isolating analog front-end supplies in portable multimeters and data loggers operating across multiple earth-referenced systems. IC Role / Device Role / Timing Role: Supplies clean, isolated 2.5V reference and 5V analog rail to ADC and op-amp stages. Use Value: Prevents measurement errors caused by circulating currents between chassis grounds of interconnected instruments. | Use Scenario: Powering isolated digital isolator channels and precision DACs in benchtop oscilloscopes and signal generators. IC Role / Device Role / Timing Role: Delivers low-noise 3.3V for logic and 1.8V for high-speed DACs, with 2kV isolation between instrument sections. Use Value: Meets stringent EN 61326-1 immunity requirements while simplifying layout with integrated transformer and LDO. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar isolated dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LTM8047 | Single-output isolated µModule (no LDO post-regulator); 3.1V–36V input; 2.5V–15V VOUT; 300mA max. | Lacks low-noise linear post-regulation - unsuitable where VOUT2 noise <50µVRMS is required. | Select when only one isolated rail is needed and board space is constrained; not a drop-in replacement for DC1988A's dual-output function. |
| ADM2587E | Isolated RS-485 transceiver with integrated DC/DC converter (not a standalone regulator); 3.3V/5V input; 5V isolated output; 100mA max. | Fixed-output, non-adjustable, and limited to communication interface power - no VOUT2 flexibility or LDO noise performance. | Choose only for RS-485 bus isolation with embedded power; cannot replace DC1988A in general-purpose isolated supply roles. |
Compared with LTM8047 and ADM2587E, DC1988A uniquely combines adjustable isolated flyback output with a separately programmable, low-noise LDO - enabling two independent, clean power domains in a single compact module, critical for mixed-signal industrial systems.
Availability
DC1988A is available at Aetrix Electronics and suitable for industrial sensors, ground loop mitigation systems, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed RoHS/SnPb variant availability.
Supply support for DC1988A 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 is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTM8058 product line - including DC1988A - was designed to simplify isolated power design by integrating transformer, controller, switches, and LDO into a single BGA module, targeting noise-sensitive industrial and instrumentation applications.
FAQ
What is the maximum output current capability of the DC1988A at VOUT1 and VOUT2?
The DC1988A delivers up to 440mA at VOUT1 when VIN = 24V and VOUT1 = 2.5V, and up to 300mA at VOUT2 across its 1.2V–12V range. These values assume proper thermal management and recommended external components; actual current depends on input/output voltage combinations and ambient conditions as shown in the "Maximum Output Current vs VIN" graphs.
Does the DC1988A require external transformers or magnetics?
No, the DC1988A integrates the isolation transformer, power switches, controller, and LDO within its BGA package. Only input and output capacitors (CIN, COUT1, COUT2) plus two resistors (RADJ1, RADJ2) are required for full operation - eliminating external magnetics and simplifying layout and qualification.
How is isolation verified for the DC1988A, and what safety standard does it meet?
The DC1988A undergoes 100% hi-pot testing at 3kV DC for one second between primary and secondary pins, certifying 2kV AC isolation. It is UL60950 recognized under file E464570, confirming compliance with international safety requirements for information technology equipment.
Can the DC1988A operate with input voltages below 5V?
Yes, the DC1988A supports a minimum input voltage of 3.1V (with BIAS = VIN) or 4.3V (with BIAS open). At low VIN, connecting BIAS to an external 3.1V–15V source improves efficiency and output current capability - critical for battery-powered or low-voltage industrial systems.
What is the purpose of the BYP pin on the DC1988A, and how does it affect performance?
The BYP pin on the DC1988A allows connection of a 0.01µF capacitor between VOUT2 and BYP to bypass the LDO reference, reducing output voltage noise to 20µVRMS (100Hz–100kHz) and improving transient response. If unused, BYP must remain unconnected - it is not internally terminated.
DC1988A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- µModule®
- Packaging:
- Box
- Product Status:
- Active
- Main Purpose:
- DC/DC Converter
- Outputs and Type:
- 2 Isolated Outputs
- Voltage - Output:
- -
- Current - Output:
- 5V, 6V
- Voltage - Input:
- 100mA, 100mA
- Regulator Topology:
- 4.5V ~ 30V
- Frequency - Switching:
- Flyback
- Contents:
- -
- Utilized IC / Part:
- Board(s)
- Power - Output:
- LTM8058
DC1988A FAQ
1.How can I place an order for DC1988A through Aetrix?
Please submit a Request for Quotation (RFQ) for DC1988A 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 DC1988A reliable?
The price and inventory of DC1988A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DC1988A is usually 5 days.
3.What payment methods are accepted for DC1988A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DC1988A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DC1988A?
DC1988A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DC1988A 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 DC1988A?
For technical support, including DC1988A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DC1988A requirements.
6.How does Aetrix verify that DC1988A is sourced from the original manufacturer or authorized distributors?
All DC1988A 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 DC1988A meets industry standards.
7.What is the process for return or replacement of DC1988A?
All DC1988A units undergo pre-shipment inspection (PSI). If there is an issue with DC1988A, 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 DC1988A part is unused and in its original packaging.
Return procedure for DC1988A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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