UCC2808AQDR-1EP - 1A Push-Pull PWM Controller, 1MHz, 8-SOIC | TI
MPN: UCC2808AQDR-1EP ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.32 | $332.00 |
| 500 | $2.95 | $1,475.00 |
| 1,000 | $2.58 | $2,580.00 |
| 2,500 | $2.22 | $5,550.00 |
UCC2808AQDR-1EP Overview
A current-mode PWM controller is a type of switching power supply controller that regulates output voltage by directly controlling the peak inductor current each switching cycle, rather than only the duty cycle. The UCC2808AQDR-1EP belongs to the current-mode controller product family, sitting within the broader hierarchy of switching regulators -> DC-DC converters -> power management ICs -> semiconductors. Current-mode control provides inherent input-voltage feedforward, cycle-by-cycle current limiting, and simplified loop compensation compared to voltage-mode architectures, making it well-suited for both isolated and non-isolated topologies.
Key features of this EP variant include a 1 MHz maximum switching frequency, 49% maximum duty cycle, 12.5V undervoltage lockout (UVLO) start-up threshold, dual 1A push-pull output drivers with active low assertion, and BiCMOS construction that reduces operating current versus bipolar predecessors. The EP designation additionally provides one assembly/test site, one fabrication site, qualification pedigree, and enhanced product-change notification for high-reliability applications. The internal oscillator is programmed via a single external resistor and capacitor pair, supporting flexible frequency design.
Architecturally, the device combines a precision reference, error amplifier, current-sense comparator, and dual totem-pole output drivers on a single BiCMOS die. The push-pull output stage eliminates the need for an external gate-drive transformer in many half-bridge and full-bridge derived designs, while current-mode operation simplifies feedback loop design. The 8-pin SOIC footprint offers straightforward PCB integration in both retrofits and new converter layouts.
Typical applications include industrial DC-DC converters, telecom isolated power modules, low-power offline auxiliary supplies, and battery-charging front-end stages. Designers often pair the controller with small MOSFETs or gate-driver transformers for 50W to 250W power levels, taking advantage of the high switching frequency to shrink magnetics and output filters.
When designing with the UCC2808AQDR-1EP, place the timing RC components close to pins 6 and 7 to minimize noise pickup, and ensure the current-sense resistor connection to pin 2 is a short, kelvin-routed trace. The push-pull outputs require proper dead-time management by the external power stage to prevent shoot-through.
This page consolidates distributor pricing, drop-in compatible variants across the same SOIC-8 footprint, and design notes specifically tailored to high-reliability push-pull converter implementations.
Drop-in alternatives for UCC2808AQDR-1EP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
UCC2808AQDR-1Q1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC2808AQDR-2
✅ Drop-In📋 Reference alternative (not in catalog)
UCC3808D-1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC3808D-2
✅ Drop-In📋 Reference alternative (not in catalog)
UCC2808AQDR-2Q1
✅ Drop-In📋 Reference alternative (not in catalog)
UCC2808AQDR-1EP Maximum Ratings & Electrical Characteristics
| Topology | Push-Pull |
| Control Mode | Current Mode |
| Number of PWM Outputs | 2 |
| Maximum Switching Frequency | 1 MHz |
| Maximum Duty Cycle | 49% |
| Output Drive Current | 1 A (peak, push-pull) |
| UVLO Start-Up Voltage | 12.5 V |
| Operating Temperature Range | -55C to +125C (EP/extended) |
| Package | 8-SOIC (D) |
| Mounting Type | Surface Mount |
| Technology | BiCMOS |
| Output Isolation | Isolated |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Product Pedigree | Enhanced Product (EP) - single fab/test site, qualified pedigree |
UCC2808AQDR-1EP Pin Configuration
| Pin 1 | RT — Oscillator timing resistor - sets CT charge current |
| Pin 2 | CS — Current-sense input - PWM terminates when CS exceeds error amplifier output |
| Pin 3 | FB — Feedback (error amplifier inverting input) |
| Pin 4 | COMP — Error amplifier output / compensation node |
| Pin 5 | GND — Ground reference for controller and output stages |
| Pin 6 | CT — Oscillator timing capacitor - sets switching frequency with RT |
| Pin 7 | VDD — Supply voltage for controller; UVLO monitored on this pin |
| Pin 8 | OUTA / OUTB — Dual push-pull outputs - alternately switch at half oscillator frequency (1A peak each) |
Typical Applications
UCC2808AQDR-1EP is suitable for 7 applications: Isolated Industrial DC-DC Converter, Telecom Isolated Power Module, Low-Power Offline Auxiliary Supply, Battery-Charging Front-End Stage, High-Reliability Military/Aerospace Supply, Small Solar Inverter Auxiliary Stage, Test & Measurement Bench Power Supply.
Isolated Industrial DC-DC Converter
The UCC2808AQDR-1EP fits isolated industrial DC-DC converter designs serving 50W to 250W power levels. Its push-pull output stages directly drive a small center-tapped transformer primary, eliminating an external gate-drive transformer and shrinking the magnetics footprint. Current-mode control provides cycle-by-cycle overcurrent protection and inherent input-voltage feedforward, which simplifies loop compensation across varying 18V-36V industrial bus inputs. The 1 MHz switching capability allows reduced transformer and inductor sizing, while the 12.5V UVLO threshold coordinates cleanly with 24V nominal supply rails at startup.
Recommended
Telecom Isolated Power Module
In telecom 48V-to-isolated-low-voltage modules, the UCC2808AQDR-1EP serves as the primary-side PWM controller, generating symmetric drive waveforms into the primary of a small isolation transformer. The BiCMOS process keeps controller quiescent current low, helping meet overall standby efficiency targets, while the 1 MHz frequency supports low-profile planar magnetics for slim 1U module form factors. The EP pedigree with full traceability is advantageous for telecom-grade reliability documentation where single fab/test site provenance is required by spec.
Recommended
Low-Power Offline Auxiliary Supply
The UCC2808AQDR-1EP is well-matched to offline auxiliary or housekeeping supplies in the 5W to 25W range, typically derived from the high-voltage bus through a small bootstrap winding or startup resistor network. The push-pull topology provides symmetric transformer flux swing without relying on DC-blocking capacitors, reducing BOM count relative to half-bridge or flyback approaches for this power level. The 12.5V UVLO behavior provides predictable startup sequencing after the bulk capacitor charges, and the controller's modest bias current keeps housekeeping losses minimal.
Recommended
Battery-Charging Front-End Stage
In battery-charging front-end stages, the UCC2808AQDR-1EP serves as the constant-current regulator controlling an isolated DC-DC stage feeding a charging buck or PFC front-end. Current-mode operation enables precise cycle-by-cycle inductor current limiting critical for lithium-chemistry batteries, and the 1 MHz switching allows the converter to operate above the AM band, simplifying EMI filter design. The extended -55C to +125C temperature range supports battery-management designs deployed in automotive, outdoor, or industrial-grade enclosures.
Recommended
High-Reliability Military/Aerospace Supply
For military and aerospace-grade power supplies, the UCC2808AQDR-1EP Enhanced Product pedigree is the primary selection criterion: single assembly/test site, single fabrication site, full qualification pedigree, enhanced product-change notification, and enhanced DMS support. These characteristics streamline the documentation and parts-management requirements typical of MIL-STD-454, MIL-PRF-38535, and similar programs. The same SOIC-8 footprint and -55C to +125C operating range simplify uprating designs to EP levels without PCB rework, while preserving the controller proven in legacy commercial platforms.
Recommended
Small Solar Inverter Auxiliary Stage
In photovoltaic inverter auxiliary supplies, the UCC2808AQDR-1EP provides isolated gate-bias and housekeeping rails derived from the PV string high-voltage bus. The push-pull topology efficiently handles the wide input voltage range typical of PV strings by using a small step-down front-end, while current-mode control maintains clean regulation across varying string voltage. The EP pedigree's traceability and DMS support reduce long-term obsolescence risk for solar installations with multi-decade service expectations.
Recommended
Test & Measurement Bench Power Supply
The UCC2808AQDR-1EP serves as the controller in laboratory-grade bench DC-DC modules where the wide operating temperature range and predictable EP pedigree documentation are valued. Current-mode control delivers precise load-step response with a single-pole compensation network, ideal for constant-voltage/constant-current bench supplies transitioning at low-current thresholds. The push-pull architecture provides low-ripple symmetric drive, and the 1 MHz switching keeps the audible-noise floor well above instrument fan noise during precision measurements.
Recommended
Recommended Products Summary
Engineering reference data for UCC2808AQDR-1EP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | UCC2808AQDR-1Q1 | UCC2808AQDR-2 | UCC3808D-1 | UCC3808D-2 | UCC2808AQDR-2Q1 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC (D) | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same | 8-SOIC (D) - same |
| Pedigree / Grade | Enhanced Product (EP), -55C to +125C | AEC-Q100 automotive | Commercial EP | Commercial 0C to +70C | Commercial 0C to +70C | AEC-Q100 automotive |
| UVLO Start-Up Threshold | 12.5 V | 12.5 V | 8 V (-36%) | 12.5 V | 8 V (-36%) | 8 V (-36%) |
| Maximum Switching Frequency | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz | 1 MHz |
| Maximum Duty Cycle | 49% | 49% | 49% | 49% | 49% | 49% |
| Output Drive Current | 1 A peak | 1 A peak | 1 A peak | 1 A peak | 1 A peak | 1 A peak |
| Topology | Push-Pull, current-mode | Push-Pull, current-mode | Push-Pull, current-mode | Push-Pull, current-mode | Push-Pull, current-mode | Push-Pull, current-mode |
| Pinout Compatible | Yes (8-SOIC base) | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Enhanced Product pedigree with single fab/test site and -55C to +125C range (vs UCC3808D-1)
- 12.5V UVLO matches 24V nominal industrial rails with predictable startup (vs UCC2808AQDR-2)
- Traceable manufacturing pedigree for DMS-critical programs (vs UCC2808AQDR-1Q1)
Design Notes
Place the timing resistor (RT) and timing capacitor (CT) on pins 1 and 6 as close as physically possible, with traces kept short and away from the OUTA/OUTB (pin 8) switching node. Use a ground-plane guard ring around the CT pin to attenuate switching-noise coupling back into the oscillator. The current-sense resistor to pin 2 (CS) should be kelvin-routed with the high-current path returning directly to the power stage ground, while the sense trace returns to the controller GND (pin 5) separately to avoid ground-loop disturbance.
The UCC2808AQDR-1EP supplies up to 1A peak into the OUTA/OUTB push-pull outputs. For high-side drive applications, ensure the driver stage is biased from a bootstrap or charge-pump network capable of replenishing the high-side gate charge every cycle. Push-pull operation inherently produces symmetric flux in the isolation transformer, but imbalance from mismatched drive resistances can lead to DC flux walking; balance the gate resistors and layout parasitics between the two outputs to mitigate.
Do not exceed the VDD maximum rating. The UVLO start-up threshold is 12.5 V, so bias supplies must charge past this level before switching resumes. Avoid leaving the COMP node (pin 4) floating during prototype bring-up; the error amplifier will produce unpredictable behavior. When using the EP variant in high-reliability applications, document the single fab/test site combination at receiving inspection to verify authenticity of pedigree.
Estimated: at 1A peak output drive with both outputs switching at 50% duty into a capacitive load of 1 nF per output at 1 MHz, the internal dissipation is on the order of 1W (P = 0.5 * C * VDD^2 * f per output). With SOIC-8 theta_JA around 100-150 C/W on a standard 4-layer board, junction rise is 100-150C above ambient, which is within the -55C to +125C operating range but warrants thermal-via attention under the exposed pad region (note: 8-SOIC lacks exposed pad - copper area under the package is limited).
The 1 MHz switching capability places fundamental and harmonics squarely above the AM broadcast band, simplifying conducted-EMI filter design versus 100 kHz-class controllers. However, the fast 1A push-pull transitions produce high dV/dt (~5 V/ns typical) on pin 8, which can couple through parasitic capacitance to adjacent traces. Maintain a 0.5mm clearance from the OUTA/OUTB trace to any sensitive analog lines, and consider a small ferrite bead on the VDD supply to attenuate high-frequency ripple.
Compliance Information
RoHS compliant per TI product information; Enhanced Product pedigree provides single fab/test-site traceability and enhanced DMS support but does not by itself confer AEC-Q100 qualification. For automotive-grade applications, choose the -1Q1 variant instead. REACH and halogen-free status not explicitly disclosed in the Verified Web Data.
