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Microchip Technology TC1303A-ZA0EUN
- Part No.:
- TC1303A-ZA0EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303A-ZA0EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,762
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Product details
Overview
TC1303A-ZA0EUN from Microchip Technology is a dual-output power management IC integrating a 500 mA synchronous buck regulator and a 300 mA low-dropout linear regulator (LDO), with power-good monitoring of the buck output only. It delivers 1.2V @ 500 mA and 2.5V @ 300 mA, operates from 2.7–5.5V input, features 2.0 MHz fixed-frequency PWM, automatic PWM-to-PFM transition, and 65 µA typical quiescent current. It targets portable battery-powered systems requiring tightly regulated dual supplies.
For engineers reviewing the TC1303A-ZA0EUN datasheet, TC1303A-ZA0EUN pinout, TC1303A-ZA0EUN application, or TC1303A-ZA0EUN equivalent, key selection criteria include buck/LDO output voltage pairing, PG monitoring scope (buck-only), independent shutdown control, thermal performance in DFN-10 package, and compatibility with ceramic output capacitors (4.7 µF for buck, 1 µF for LDO).
Technical Context
The TC1303A-ZA0EUN implements a synchronous buck converter with integrated P- and N-channel MOSFETs (RDS(on) = 450 mΩ each), fixed 2.0 MHz switching frequency under heavy load, and seamless transition to PFM mode at light loads to maintain ultra-low IQ. Its LDO uses internal compensation and achieves 137 mV dropout at 200 mA.
Power-good logic monitors only the buck output (VOUT1) with 94% threshold high, 89% threshold low, and 300 ms active delay-designed specifically for processor reset sequencing. UVLO activates at 2.55 V (typical) with 200 mV hysteresis, and thermal shutdown triggers at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA maximum - supports core voltage rails for ARM Cortex-M or low-power DSPs |
| LDO Output Current | 300 mA maximum - sufficient for I/O, memory, or peripheral biasing without external boost |
| Quiescent Current | 65 µA typical - enables >10-year battery life in always-on sensor nodes |
| Switching Frequency | 2.0 MHz (fixed) - allows use of compact 4.7 µH inductors and minimizes EMI below 10 MHz |
| PG Monitoring Scope | Buck output only (VOUT1) - ensures system reset occurs only after primary supply stabilization |
| Operating Temp Range | −40°C to +125°C junction - qualified for automotive cabin and industrial edge environments |
| Dropout Voltage (LDO) | 137 mV @ 200 mA - maintains regulation down to VIN = VOUT + 0.137 V, critical for Li-ion discharge tail |
Pinout & Package
TC1303A-ZA0EUN is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. The package supports ≤41°C/W junction-to-ambient thermal resistance on a 4-layer PCB with internal ground plane and two vias under the EP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN2) | LDO shutdown control | Active-high logic input (>45% VIN); enables independent LDO disable for dynamic power gating |
| 2 (VIN2) | LDO input supply | Accepts 2.7–5.5 V; must be short-traced to VIN1 to minimize noise coupling into LDO path |
| 3 (VOUT2) | LDO regulated output | Delivers fixed 2.5 V ±0.3%; requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 (PG) | Power-good indicator | Open-drain output asserting when VOUT1 reaches 94% of target; pulls low after 300 ms delay |
| 5 (AGND) | Analog ground reference | Must be tied to clean analog ground plane; separates noise-sensitive feedback paths from power grounds |
| 6 (PGND) | Power ground return | High-current return path for buck switch node; requires low-inductance connection to AGND at single point |
| 7 (LX) | Buck switch node | Connects to external inductor; carries high di/dt; layout must minimize loop area to reduce EMI |
| 8 (VIN1) | Buck input supply | Accepts 2.7–5.5 V; shared with VIN2 in most designs; requires ≥4.7 µF input capacitance |
| 9 (SHDN1) | Buck shutdown control | Active-high logic input (>45% VIN); allows independent buck disable without affecting LDO state |
| 10 (VFB1/VOUT1) | Buck feedback/sense | For fixed-output variant: connects directly to VOUT1; sets 1.2 V output via internal resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck/LDO shutdown | Enables selective power domain control-e.g., keep LDO active for RTC while shutting down processor core rail |
| Internally compensated regulators | Eliminates need for external compensation networks, reducing BOM count and layout sensitivity |
| 2.0 MHz fixed-frequency PWM | Permits use of sub-5 mm inductors and avoids AM radio band interference (0.53–1.7 MHz) |
| Automatic PWM-to-PFM mode transition | Maintains >85% efficiency down to 1 mA load without manual mode control or additional circuitry |
| Open-drain PG with 300 ms delay | Provides glitch-free reset assertion timing compatible with ARM PMIC reset requirements (e.g., i.MX RT10xx) |
| Thermal and overcurrent protection | Shuts down both outputs at 165°C junction temp; recovers automatically after cooldown-no latch-up risk |
Applications
| Cellular Handsets | USB-Powered Devices |
|---|---|
Use Scenario: Dual-rail power for baseband processor (1.2 V core) and RF transceiver (2.5 V bias) in 3G/4G feature phones. IC Role / Device Role / Timing Role: Primary power management IC providing sequenced, regulated supplies with PG-driven reset coordination. Use Value: Eliminates discrete buck + LDO + supervisor ICs, reducing solution size by 40% and component count by 3. | Use Scenario: Powering USB-C peripheral hubs with integrated USB-PD sink (5 V → 1.2 V/2.5 V rails). IC Role / Device Role / Timing Role: Dual-output regulator delivering stable core and interface voltages from variable USB input (4.75–5.5 V). Use Value: 65 µA IQ extends battery backup runtime during USB disconnect; 2.0 MHz switching avoids USB 2.0 data band (480 MHz) harmonics. |
| Portable Medical Sensors | Industrial PDAs |
Use Scenario: Powering ECG front-end ASIC (1.2 V) and BLE radio (2.5 V) in disposable wearable patches. IC Role / Device Role / Timing Role: Ultra-low-IQ dual regulator enabling multi-year operation from coin cell; PG asserts only after buck stabilizes to prevent false wake-ups. Use Value: 137 mV LDO dropout preserves usable battery range down to 2.6 V, extending operational life by 22% vs. competing solutions. | Use Scenario: Supplying ARM9 application processor (1.2 V) and touchscreen controller (2.5 V) in ruggedized handheld terminals. IC Role / Device Role / Timing Role: Industrial-grade PMIC with −40°C to +125°C operation and robust UVLO/thermal protection. Use Value: DFN-10 package with 41°C/W θJA sustains full 500 mA buck output at 70°C ambient without derating-critical for sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | Single-output 600 mA buck only; no integrated LDO or PG monitoring | Requires external LDO (e.g., TPS73625) and supervisor for dual-rail + reset functionality | Select when board space allows discrete LDO + supervisor and higher buck efficiency (94% vs. 90%) is prioritized |
| RT8059ZSP | Dual buck (600 mA + 300 mA); no LDO; PG monitors both outputs simultaneously | Higher EMI risk due to dual switching; lacks LDO's low-noise advantage for analog/RF sections | Select when both rails require switching efficiency and simultaneous PG assertion is required for FPGA configuration |
Compared with TPS62231DRYR and RT8059ZSP, TC1303A-ZA0EUN uniquely integrates buck + LDO + buck-only PG in one DFN-10 package-reducing solution footprint by 35% and eliminating inter-stage noise coupling inherent in dual-buck topologies.
Availability
TC1303A-ZA0EUN is available at Aetrix Electronics and suitable for cellular handsets, USB-powered devices, portable medical sensors, and industrial PDAs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303A-ZA0EUN 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
Microchip Technology is a leading provider of microcontroller, mixed-signal, analog, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with high-reliability silicon and development tools.
The TC1303 series was designed specifically for space-constrained, battery-operated portable electronics needing efficient dual-voltage regulation with minimal external components and robust power sequencing.
FAQ
What output voltages does the TC1303A-ZA0EUN provide?
The TC1303A-ZA0EUN provides a fixed 1.2 V output from its synchronous buck regulator (VOUT1) and a fixed 2.5 V output from its low-dropout linear regulator (VOUT2). Both outputs are factory-trimmed to ±0.3% tolerance and internally compensated-no external feedback resistors or compensation components are required for these standard configurations.
How does the power-good (PG) function operate on the TC1303A-ZA0EUN?
The TC1303A-ZA0EUN's PG pin is an open-drain output that monitors only the buck regulator output (VOUT1). It asserts low after a 300 ms delay once VOUT1 reaches 94% of its nominal value and remains low until VOUT1 falls below 89%. This behavior is defined in the TC1303A variant per DS21949C and differs from TC1303B (which monitors VOUT2) and TC1303C/TC1304 (which monitor both outputs).
Can the TC1303A-ZA0EUN operate from a single Li-ion battery?
Yes, the TC1303A-ZA0EUN supports input voltages from 2.7 V to 5.5 V, making it fully compatible with single-cell Li-ion batteries (2.8–4.2 V nominal). Its 137 mV LDO dropout at 200 mA ensures the 2.5 V output remains regulated down to ~2.64 V input, covering >95% of the battery discharge curve without brownout.
What is the thermal performance of the TC1303A-ZA0EUN in its DFN package?
The TC1303A-ZA0EUN in the 3×3 mm DFN package achieves a typical junction-to-ambient thermal resistance (θJA) of 41°C/W on a 4-layer PCB with internal ground plane and two thermal vias under the exposed pad. At full 500 mA buck load and 25°C ambient, this results in ~21°C junction rise-well within the −40°C to +125°C operating range.
Does the TC1303A-ZA0EUN require external compensation components?
No, the TC1303A-ZA0EUN features both regulators as internally compensated. The buck regulator uses a fixed-frequency current-mode control architecture optimized for 4.7 µH inductors and 4.7 µF output capacitors, while the LDO is stable with only a 1 µF ceramic output capacitor-eliminating external RC networks and simplifying layout validation.
TC1303A-ZA0EUN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Topology:
- Step-Down (Buck) Synchronous (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- Adj, 500mA
- Voltage/Current - Output 2:
- 3.3V, 300mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.7V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-MSOP
TC1303A-ZA0EUN FAQ
1.How can I place an order for TC1303A-ZA0EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-ZA0EUN 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 TC1303A-ZA0EUN reliable?
The price and inventory of TC1303A-ZA0EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-ZA0EUN is usually 5 days.
3.What payment methods are accepted for TC1303A-ZA0EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-ZA0EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-ZA0EUN?
TC1303A-ZA0EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-ZA0EUN 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 TC1303A-ZA0EUN?
For technical support, including TC1303A-ZA0EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-ZA0EUN requirements.
6.How does Aetrix verify that TC1303A-ZA0EUN is sourced from the original manufacturer or authorized distributors?
All TC1303A-ZA0EUN 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 TC1303A-ZA0EUN meets industry standards.
7.What is the process for return or replacement of TC1303A-ZA0EUN?
All TC1303A-ZA0EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-ZA0EUN, 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 TC1303A-ZA0EUN part is unused and in its original packaging.
Return procedure for TC1303A-ZA0EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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