UCD3138 - Digital Controller for Isolated Power | Texas Instruments
MPN: UCD3138 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.44 | $5,440.00 |
Drop-in alternatives for UCD3138 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
UCD3138A
β Drop-Inπ Reference alternative (not in catalog)
UCD3138064
β Drop-Inπ Reference alternative (not in catalog)
UCD3138128
β Drop-Inπ Reference alternative (not in catalog)
UCD3138064A
β Drop-Inπ Reference alternative (not in catalog)
UCD3138128A
β Drop-Inπ Reference alternative (not in catalog)
XDPP1100
β Drop-Inπ Reference alternative (not in catalog)
DSC6000
β Drop-Inπ Reference alternative (not in catalog)
UCD3138 Maximum Ratings & Electrical Characteristics
| Number of Feedback Loops | 3 |
| Number of DPWM Outputs | 8 |
| DPWM Resolution | 250 ps |
| Processor Core | ARM7TDMI-S |
| Processor Clock Speed | 31.25 MHz |
| ADC Resolution | 12-bit |
| ADC Sample Rate | 2 MSPS |
| Supply Voltage | 3.3 V |
| Package | VQFN-40 (6x6 mm) |
| Operating Temperature Range | -40C to +125C |
| Communication Interfaces | PMBus, UART |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
| Thermal Resistance (theta_JA) | [DATA_NEEDED: Thermal Resistance] |
UCD3138 Pin Configuration
| Pin 1 | DPWM1A β Digital PWM output A for channel 1 |
| Pin 2 | DPWM1B β Digital PWM output B for channel 1 |
| Pin 3 | DPWM2A β Digital PWM output A for channel 2 |
| Pin 4 | DPWM2B β Digital PWM output B for channel 2 |
| Pin 5 | DPWM3A β Digital PWM output A for channel 3 |
| Pin 6 | DPWM3B β Digital PWM output B for channel 3 |
| Pin 7 | DPWM4A β Digital PWM output A for channel 4 |
| Pin 8 | DPWM4B β Digital PWM output B for channel 4 |
| Pin 9 | VDD β Digital power supply (3.3V) |
| Pin 10 | GND β Ground |
| Pin 11 | VDDA β Analog power supply (3.3V) |
| Pin 12 | AGND β Analog ground |
| Pin 13 | ADCIN0 β Analog-to-digital converter input 0 |
| Pin 14 | ADCIN1 β Analog-to-digital converter input 1 |
| Pin 15 | ADCIN2 β Analog-to-digital converter input 2 |
| Pin 16 | ADCIN3 β Analog-to-digital converter input 3 |
| Pin 17 | PMBUS_CLK β PMBus clock |
| Pin 18 | PMBUS_DATA β PMBus data |
| Pin 19 | UART_TX β UART transmit |
| Pin 20 | UART_RX β UART receive |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
UCD3138 is suitable for 6 applications: Server Power Supplies, Telecom Rectifiers, AC-DC Adapters, Industrial Power Supplies, EV Charging Stations, Renewable Energy Inverters.
Server Power Supplies
The UCD3138 is ideal for server power supplies due to its three feedback loops and eight DPWM outputs, enabling precise control of LLC or phase-shifted full-bridge topologies. Its 250 ps DPWM resolution ensures high-efficiency operation, and the PMBus interface allows real-time telemetry and control. In a typical 1.5 kW server PSU, the UCD3138 manages the DC-DC stage, providing fast transient response and adaptive voltage scaling. The integrated ADC monitors input/output voltages and currents, enabling fault detection and protection. Compared to analog controllers, the UCD3138 offers flexibility in firmware tuning, allowing optimization for different load conditions and efficiency targets.
Recommended
Telecom Rectifiers
In telecom rectifiers, the UCD3138 provides digital control for AC-DC conversion stages, ensuring high efficiency and reliability. Its three feedback loops allow independent regulation of voltage, current, and power, which is essential for battery charging applications. The device's PMBus interface enables remote monitoring and control, facilitating integration into telecom power management systems. The UCD3138's fast ADC (2 MSPS) ensures accurate sensing of fast transients, while the DPWM outputs can be configured for interleaved operation to reduce ripple. This makes the UCD3138 suitable for high-power rectifiers up to several kilowatts, where precise digital control improves overall system performance.
Recommended
AC-DC Adapters
The UCD3138 is well-suited for AC-DC adapters, particularly for high-density designs where efficiency and size are critical. Its integrated ARM7TDMI-S core allows implementation of advanced control algorithms such as burst mode and light-load efficiency optimization. The 250 ps DPWM resolution enables precise frequency control in resonant converters, reducing switching losses. The device's small VQFN-40 package and low external component count make it ideal for compact adapter designs. Additionally, the UCD3138 supports multiple protection features, including over-voltage, over-current, and over-temperature, ensuring reliable operation in consumer applications.
Recommended
Industrial Power Supplies
For industrial power supplies, the UCD3138 offers robust digital control with wide input voltage ranges and high reliability. Its three feedback loops can be configured for voltage, current, and power regulation, making it suitable for battery chargers and motor drives. The device's UART interface allows easy firmware updates and diagnostics. The UCD3138's operating temperature range of -40C to +125C ensures operation in harsh environments. With its flexible DPWM configuration, the UCD3138 can support various topologies, including full-bridge and push-pull, providing a versatile solution for industrial applications.
Recommended
EV Charging Stations
The UCD3138 is increasingly used in EV charging stations for AC-DC and DC-DC conversion stages. Its high-resolution DPWM outputs (250 ps) enable precise control of LLC converters, achieving high efficiency at various load levels. The PMBus interface allows communication with the charging station controller for power management and fault reporting. The UCD3138's fast ADC ensures accurate current and voltage sensing, critical for safe charging. With support for multiple topologies and firmware flexibility, the UCD3138 can be adapted to different charging standards, making it a key component in modern EV infrastructure.
Recommended
Renewable Energy Inverters
In renewable energy inverters, the UCD3138 provides digital control for DC-AC conversion, enabling maximum power point tracking (MPPT) and grid synchronization. Its three feedback loops can regulate DC bus voltage, output current, and power factor. The device's high-speed ADC (2 MSPS) allows real-time monitoring of grid conditions, while the DPWM outputs can generate high-frequency PWM signals for IGBT or GaN switches. The UCD3138's flexibility in firmware enables implementation of advanced control algorithms for grid stability. Its wide operating temperature range and robust protection features make it suitable for outdoor installations.
Recommended
Recommended Products Summary
Engineering reference data for UCD3138 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCD3138A | UCD3138064 | UCD3138128 | XDPP1100 |
|---|---|---|---|---|---|
| Package | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) | VQFN-40 (6x6 mm) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Infineon |
| Number of Feedback Loops | 3 | 3 | 3 | 3 | 3 |
| Number of DPWM Outputs | 8 | 8 | 8 | 8 | 8 |
| DPWM Resolution | 250 ps | 250 ps | 250 ps | 250 ps | 150 ps |
| Processor Core | ARM7TDMI-S | ARM7TDMI-S | ARM7TDMI-S | ARM7TDMI-S | ARM Cortex-M0 |
| ADC Resolution | 12-bit | 12-bit | 12-bit | 12-bit | 12-bit |
| ADC Sample Rate | 2 MSPS | 2 MSPS | 2 MSPS | 2 MSPS | 1 MSPS |
Key Differentiators
- Higher DPWM resolution (250 ps) compared to XDPP1100 (150 ps) (vs XDPP1100)
- Integrated ARM7TDMI-S core with 31.25 MHz clock (vs DSC6000)
- Three feedback loops with dedicated error ADCs (vs UCD3020)
Design Notes
The UCD3138 requires a clean 3.3V supply for both VDD and VDDA. Use separate low-impedance traces and place 0.1uF and 10uF decoupling capacitors close to each power pin. Avoid sharing the analog and digital ground planes to prevent noise coupling into the ADC inputs.
For optimal performance, group the DPWM outputs and route them with controlled impedance to the gate drivers. Keep the ADC input traces short and shielded to minimize noise. Refer to the TI Practical Design Guideline (SNIU028) for detailed layout recommendations.
Ensure the DPWM outputs are not overloaded; they are designed to drive logic-level signals, not directly drive power MOSFETs. Use appropriate gate drivers. Also, verify the firmware configuration for the specific power topology to avoid incorrect PWM timing.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified.
