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Microchip Technology TC1303A-PP3EUN
- Part No.:
- TC1303A-PP3EUN
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303A-PP3EUN.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,037
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Product details
Overview
TC1303A-PP3EUN 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 1.8V @ 500 mA and 2.5V @ 300 mA from a 2.7–5.5V input, features 2.0 MHz fixed-frequency PWM operation, 65 µA typical quiescent current, and operates across –40°C to +125°C junction temperature. It targets compact battery-powered systems requiring tightly regulated dual-rail supplies.
For engineers reviewing the TC1303A-PP3EUN datasheet, TC1303A-PP3EUN pinout, TC1303A-PP3EUN application, or TC1303A-PP3EUN equivalent, key selection criteria include buck/LDO output voltage pairing, PG monitoring scope (buck-only), shutdown independence, thermal performance in 3×3 DFN, and compatibility with ceramic output capacitors (4.7 µF for buck, 1 µF for LDO).
Technical Context
The TC1303A-PP3EUN implements a synchronous buck stage with PFM/PWM auto-transition at light loads and an internally compensated LDO stage with 137 mV typical dropout at 200 mA. Its power-good circuit monitors only the buck output (VOUT1) with 94% threshold and 300 ms delay, enabling reliable processor reset sequencing.
It uses independent logic-level shutdown inputs (SHDN1 for buck, SHDN2 for LDO), supports adjustable or fixed VOUT1 (0.8–4.5V or standard values), and offers fixed VOUT2 options including 2.5V. Protection includes UVLO (2.55V nominal), overtemperature shutdown (165°C), and short-circuit limiting on both outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output 1 (Buck) | 1.8V fixed, 500 mA max - powers core logic or microcontroller at high efficiency (>90% typical) |
| Output 2 (LDO) | 2.5V fixed, 300 mA max - provides low-noise bias rail with 137 mV dropout at 200 mA |
| Quiescent Current | 65 µA typical - enables ultra-low-power standby in portable devices |
| Switching Frequency | 2.0 MHz fixed - allows use of small 4.7 µH inductor and compact 4.7 µF output capacitor |
| Power-Good Monitoring | Buck output only (VOUT1), 94% threshold, 300 ms delay - ensures stable core voltage before system release |
| Operating Temperature | –40°C to +125°C junction - suitable for industrial and automotive under-hood environments |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion (2.7–4.2V) and USB 5V supply rails |
Pinout & Package
TC1303A-PP3EUN is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. The package supports high-power-density layouts and achieves θJA = 41°C/W on a 4-layer board with internal ground plane and thermal vias.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SHDN2 | LDO shutdown control: logic-high (>45% VIN) enables VOUT2; open-drain compatible with pull-up |
| 2 | VIN2 | LDO input supply - must be tied closely to VIN1; accepts same 2.7–5.5V input as buck stage |
| 3 | VOUT2 | 2.5V regulated LDO output - requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 | PG | Open-drain power-good output - asserts low when VOUT1 reaches 94% of 1.8V, with 300 ms delay |
| 5 | AGND | Analog ground reference - must be connected to clean analog ground plane, separate from PGND |
| 6 | PGND | Power ground return for buck switch node - routed separately from AGND to minimize noise coupling |
| 7 | LX | Buck switch node - connects to external inductor; requires low-inductance layout to reduce EMI |
| 8 | VIN1 | Buck input supply - shared with VIN2; minimum 4.7 µF ceramic input capacitor required |
| 9 | SHDN1 | Buck shutdown control - independent logic input; enables precise sequencing of VOUT1 turn-on/off |
| 10 | VFB1/VOUT1 | Buck feedback/sense - for fixed 1.8V version, directly connects to VOUT1; no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent buck and LDO shutdown | Enables flexible power sequencing: e.g., hold LDO active while cycling buck for firmware update |
| Internally compensated buck and LDO | Eliminates need for external compensation components - reduces BOM count and layout area |
| 2.0 MHz PWM with automatic PFM transition | Maintains >90% efficiency at heavy load and drops IQ to ~38 µA at light load without control intervention |
| Low-noise LDO with 1 µF capacitor support | Minimizes board space and cost vs. traditional LDOs requiring ≥10 µF tantalum or aluminum electrolytic |
| Open-drain PG with 300 ms delay | Provides robust reset assertion timing for processors requiring guaranteed minimum reset pulse width |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
|
Use Scenario: Handheld glucose meter with ARM Cortex-M0+ MCU and analog front-end. IC Role / Device Role / Timing Role: TC1303A-PP3EUN supplies 1.8V core voltage (VOUT1) and 2.5V ADC reference (VOUT2); PG signal resets MCU until stable. Use Value: 65 µA quiescent current extends battery life; 137 mV LDO dropout ensures full 2.5V output even at end-of-discharge (2.7V input). |
Use Scenario: Compact oscilloscope module powered via USB 5V bus. IC Role / Device Role / Timing Role: Generates 1.8V digital rail and 2.5V analog rail; independent SHDN1/SHDN2 allow selective subsystem power-down. Use Value: 2.0 MHz switching enables <10 mm² total DC/DC area; open-drain PG interfaces directly with USB controller reset logic. |
| Industrial Handheld Terminals | Wearable Health Monitors |
|
Use Scenario: Rugged barcode scanner operating in cold storage (-20°C ambient). IC Role / Device Role / Timing Role: Dual-rail supply for SoC (1.8V) and display driver (2.5V); PG monitors buck output only to avoid false resets from LDO transients. Use Value: –40°C to +125°C rating ensures startup and regulation at low temperature; 165°C thermal shutdown prevents damage during extended operation. |
Use Scenario: ECG patch with Bluetooth LE radio and ultra-low-power sensor hub. IC Role / Device Role / Timing Role: Powers MCU core (1.8V) and analog signal chain (2.5V); SHDN2 disables LDO during sleep while buck remains ready. Use Value: Independent shutdown reduces system standby current to sub-µA levels; 1 µF LDO output cap fits constrained wearable PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303B-PP3EUN | PG monitors LDO output (VOUT2) instead of buck; identical pinout and electrical specs otherwise | Suitable where system reset depends on auxiliary rail stability (e.g., analog sensor bias), not core voltage | Select TC1303B-PP3EUN if reset timing must track VOUT2; verify PG threshold (94% of 2.5V = 2.35V) meets host requirements |
| TC1303C-PP3EUN | PG monitors both VOUT1 and VOUT2 simultaneously; same package and output voltages | Required for systems needing guaranteed co-regulation of both rails before release (e.g., mixed-signal SoCs) | Choose TC1303C-PP3EUN only if dual-rail monitoring is mandatory; adds complexity vs. single-rail PG for most applications |
Compared with TC1303B-PP3EUN and TC1303C-PP3EUN, the TC1303A-PP3EUN provides the simplest reset architecture-tied exclusively to the critical core rail-reducing design risk and simplifying validation for applications where LDO stability is less time-sensitive than processor supply.
Availability
TC1303A-PP3EUN is available at Aetrix Electronics and suitable for portable medical sensors, USB-powered test equipment, and industrial handheld terminals requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TC1303A-PP3EUN 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 microcontrollers, analog components, and power management ICs, with a focus on reliability, low-power design, and embedded control solutions.
The TC1303 family was designed specifically for space-constrained, battery-operated devices needing dual regulated rails with minimal external components and robust protection - targeting cellular phones, PDAs, and portable instrumentation.
FAQ
What output voltages does the TC1303A-PP3EUN provide?
The TC1303A-PP3EUN provides fixed 1.8V at up to 500 mA from its synchronous buck regulator (VOUT1) and fixed 2.5V at up to 300 mA from its low-dropout linear regulator (VOUT2). These values are laser-trimmed at wafer test and do not require external feedback resistors. The part number suffix "PP3EUN" explicitly denotes this 1.8V/2.5V configuration in the 10-pin DFN package.
How does the power-good (PG) function work on the TC1303A-PP3EUN?
The TC1303A-PP3EUN's PG pin is an open-drain output that asserts low when the buck output (VOUT1) reaches and maintains ≥94% of its nominal 1.8V value, with a built-in 300 ms delay after regulation is achieved. It remains asserted low until VOUT1 falls below 89% of 1.8V. This behavior is specific to the TC1303A variant and differs from TC1303B (PG monitors VOUT2) and TC1303C (PG monitors both outputs).
Can the TC1303A-PP3EUN operate from a single-cell Li-ion battery?
Yes, the TC1303A-PP3EUN supports an input voltage range of 2.7V to 5.5V, fully covering the discharge profile of a single-cell Li-ion battery (typically 4.2V down to 2.7V). At 2.7V input, the 137 mV typical dropout of the 2.5V LDO ensures regulation is maintained, and the buck regulator sustains 1.8V output with adequate headroom (2.7V – 1.8V = 0.9V > required ~280 mV dropout at 500 mA).
What is the thermal performance of the TC1303A-PP3EUN in its DFN package?
In the 3×3 mm DFN package with exposed pad soldered to AGND, the TC1303A-PP3EUN 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 pad. This allows continuous 500 mA buck output at ambient temperatures up to +85°C without exceeding the +125°C maximum junction temperature, assuming proper layout and airflow.
Does the TC1303A-PP3EUN require external compensation components?
No, the TC1303A-PP3EUN features fully internal compensation for both the buck regulator and the LDO. Neither stage requires external compensation capacitors or resistors. This simplifies design, reduces bill-of-materials cost, and eliminates tuning effort - a key advantage confirmed in the device's functional block diagram and "Features" section of the DS21949C datasheet.
TC1303A-PP3EUN 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:
- 1.8V, 500mA
- Voltage/Current - Output 2:
- 1.8V, 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-PP3EUN FAQ
1.How can I place an order for TC1303A-PP3EUN through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-PP3EUN 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-PP3EUN reliable?
The price and inventory of TC1303A-PP3EUN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-PP3EUN is usually 5 days.
3.What payment methods are accepted for TC1303A-PP3EUN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-PP3EUN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-PP3EUN?
TC1303A-PP3EUN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-PP3EUN 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-PP3EUN?
For technical support, including TC1303A-PP3EUN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-PP3EUN requirements.
6.How does Aetrix verify that TC1303A-PP3EUN is sourced from the original manufacturer or authorized distributors?
All TC1303A-PP3EUN 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-PP3EUN meets industry standards.
7.What is the process for return or replacement of TC1303A-PP3EUN?
All TC1303A-PP3EUN units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-PP3EUN, 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-PP3EUN part is unused and in its original packaging.
Return procedure for TC1303A-PP3EUN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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