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Microchip Technology TC1303A-ZI0EMF
- Part No.:
- TC1303A-ZI0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303A-ZI0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,090
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Product details
Overview
TC1303A-ZI0EMF 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 90%+ efficiency at 2.0 MHz switching frequency, 65 µA typical quiescent current, and 137 mV typical LDO dropout at 200 mA - optimized for battery-powered portable electronics requiring tightly regulated core and I/O rails.
For engineers reviewing the TC1303A-ZI0EMF datasheet, TC1303A-ZI0EMF pinout, TC1303A-ZI0EMF application, or TC1303A-ZI0EMF equivalent, key selection criteria include buck/LDO output voltage configuration (fixed 1.2V/2.5V in this variant), PG monitoring scope (buck-only), independent shutdown control, thermal performance in 3×3 DFN, and compatibility with ceramic output capacitors down to 1 µF on LDO.
Technical Context
The TC1303A-ZI0EMF implements a fixed-frequency PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low IQ, while its LDO uses internal compensation and requires no external capacitor beyond the mandatory 1 µF ceramic output. The power-good signal is an open-drain output tied exclusively to VOUT1 regulation with 300 ms delay, enabling reliable processor reset sequencing.
Its dual-input architecture (VIN1 for buck, VIN2 for LDO) supports independent supply domains but mandates tight board-level routing between them; UVLO activates at 2.55 V (typical) with 200 mV hysteresis, and overtemperature protection triggers at 165°C with 10°C hysteresis - critical for sustained operation in handheld medical instruments and USB-powered devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports core voltage rail for low-power microcontrollers and SoCs |
| LDO Output Current | 300 mA max - powers auxiliary peripherals such as sensors or interface ICs |
| Switching Frequency | 2.0 MHz (typical) - enables compact 4.7 µH inductor and reduces EMI filtering burden |
| Quiescent Current | 65 µA (typical) - extends battery life in always-on or sleep-mode applications |
| LDO Dropout Voltage | 137 mV (typical @ 200 mA) - allows operation with minimal input–output differential |
| Power-Good Delay | 300 ms - provides stable reset timing for embedded processors after power-up |
| Operating Junction Temp | -40°C to +125°C - qualified for industrial and automotive-adjacent portable environments |
Pinout & Package
TC1303A-ZI0EMF is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed pad (EP) connected to AGND. Pin numbering follows standard DFN orientation (pin 1 top-left, counterclockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN2 | LDO shutdown control input | Active-high logic (>45% VIN); enables/disables LDO independently of buck stage |
| 2 VIN2 | LDO input supply | Accepts 2.7–5.5 V; must be routed adjacent to VIN1 to minimize noise coupling |
| 3 VOUT2 | LDO regulated output | Fixed 2.5 V output; 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 connect to clean analog ground plane; separate from PGND for noise isolation |
| 6 PGND | Power ground return | High-current return path for buck switch node; ties to AGND only at single point |
| 7 LX | Buck switch node | Connects to external inductor; requires low-inductance layout to minimize ringing |
| 8 VIN1 | Buck input supply | Accepts 2.7–5.5 V; shared input source with VIN2 per design note #8 |
| 9 SHDN1 | Buck shutdown control input | Active-high logic (>45% VIN); independent enable/disable of buck regulator |
| 10 VFB1/VOUT1 | Buck feedback or output | Configured as fixed 1.2 V output (ZI0EMF suffix); no external divider needed |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staged power sequencing - e.g., disable LDO first during system sleep |
| Internally compensated LDO | Eliminates need for external compensation network; reduces BOM count and layout area |
| Automatic PWM-to-PFM transition | Maintains high efficiency across full load range without firmware intervention or external mode control |
| Open-drain PG with 300 ms delay | Directly drives standard processor RESET pins; eliminates need for external RC timing circuit |
| Thermal and short-circuit protection | Integrated 165°C shutdown with 10°C hysteresis and cycle-by-cycle current limiting on both outputs |
Applications
| Cellular Phones | USB-Powered Devices |
|---|---|
Use Scenario: Powering baseband processor core (1.2 V) and RF transceiver bias (2.5 V) from single Li-ion cell. IC Role / Device Role / Timing Role: Dual-rail PMIC providing sequenced, low-noise supplies with integrated power-good reset assertion. Use Value: Reduces component count vs. discrete regulators; 2.0 MHz switching avoids audible noise and enables miniaturized magnetics. | Use Scenario: Regulating 5 V USB input to 1.2 V MCU core and 2.5 V sensor interface in portable diagnostic tool. IC Role / Device Role / Timing Role: Primary power converter delivering stable, low-ripple dual outputs with guaranteed startup timing via PG delay. Use Value: 65 µA quiescent current extends battery runtime in intermittent-use medical instruments; 137 mV LDO dropout maximizes usable battery voltage range. |
| Handheld Medical Instruments | Portable Computers |
Use Scenario: Supplying ADC reference (2.5 V) and low-power Cortex-M4 core (1.2 V) in battery-operated glucose meter. IC Role / Device Role / Timing Role: Precision dual-output regulator with tight line/load regulation (±0.3%) and low output noise (1.8 µV/√Hz). Use Value: Maintains measurement accuracy under varying battery voltage; PG signal ensures deterministic MCU initialization before sampling. | Use Scenario: Generating core voltage for embedded controller and I/O rail for display interface in ultra-thin tablet. IC Role / Device Role / Timing Role: Compact dual-regulator solution in space-constrained 3×3 mm DFN package with thermal pad for passive cooling. Use Value: θJA = 41°C/W (DFN) enables continuous 500 mA buck operation without forced air; supports fanless thermal design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1303B-ZI0EMF | PG monitors LDO output (VOUT2) instead of buck output; same pinout and package | Suitable where LDO rail stability is primary reset trigger (e.g., analog subsystems) | Select when power-good assertion must track auxiliary rail rather than core rail |
| TPS62231DRYR | Single-output 600 mA buck only; no integrated LDO or PG; 2.25 MHz switching | Requires external LDO and reset supervisor for dual-rail systems | Choose when higher buck efficiency (>92%) or smaller solution size is prioritized over integration |
Compared with TC1303B-ZI0EMF, TC1303A-ZI0EMF provides earlier system reset assertion aligned with core voltage readiness; versus TPS62231DRYR, it trades buck efficiency for full dual-rail integration and reduced bill-of-materials complexity.
Availability
TC1303A-ZI0EMF is available at Aetrix Electronics and suitable for cellular phones, USB-powered devices, and handheld medical instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303A-ZI0EMF 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 semiconductor products.
The TC1303 series is designed specifically for space-constrained, battery-powered portable electronics needing highly integrated dual-voltage regulation with minimal external components and robust protection features.
FAQ
What output voltages does the TC1303A-ZI0EMF provide?
The TC1303A-ZI0EMF delivers 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). These values are factory-configured and do not require external feedback resistors - confirmed by the "ZI0EMF" suffix per Microchip's ordering guide and DS21949C-page 5 fixed-output application diagrams.
How does the power-good (PG) function operate in the TC1303A-ZI0EMF?
The TC1303A-ZI0EMF's PG pin is an open-drain output that asserts low after a 300 ms delay once the buck output (VOUT1) reaches 94% of its nominal 1.2 V value. It remains active until VOUT1 falls below 92% of regulation. This behavior is specific to the TC1303A variant, which monitors only the buck rail - unlike TC1303B (LDO-only) or TC1303C (both rails).
Can the TC1303A-ZI0EMF operate with different input voltages on VIN1 and VIN2?
No - the TC1303A-ZI0EMF requires VIN1 and VIN2 to be supplied from the same input source, as explicitly stated in Note 8 of DS21949C-page 7. While the pins are electrically separate, routing them to independent supplies violates the device's operational specification and may cause instability or undefined behavior.
What is the minimum output capacitance required for stable operation of the TC1303A-ZI0EMF's LDO?
The TC1303A-ZI0EMF's LDO output (VOUT2) requires a minimum of 1 µF ceramic capacitor connected between VOUT2 and AGND for stability, as specified in the Description section (DS21949C-page 2) and Typical Application Circuits (DS21949C-page 5). Larger values improve transient response but are not required for basic regulation.
Does the TC1303A-ZI0EMF support automatic power sequencing between its two outputs?
No - automatic sequencing is exclusive to the TC1304 variant. The TC1303A-ZI0EMF provides independent shutdown control via SHDN1 (buck) and SHDN2 (LDO), requiring external logic or firmware to coordinate turn-on/turn-off order. Sequencing must be implemented externally if needed for system-level power management.
TC1303A-ZI0EMF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- 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:
- 2.5V, 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-DFN (3x3)
TC1303A-ZI0EMF FAQ
1.How can I place an order for TC1303A-ZI0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-ZI0EMF 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-ZI0EMF reliable?
The price and inventory of TC1303A-ZI0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-ZI0EMF is usually 5 days.
3.What payment methods are accepted for TC1303A-ZI0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-ZI0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-ZI0EMF?
TC1303A-ZI0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-ZI0EMF 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-ZI0EMF?
For technical support, including TC1303A-ZI0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-ZI0EMF requirements.
6.How does Aetrix verify that TC1303A-ZI0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303A-ZI0EMF 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-ZI0EMF meets industry standards.
7.What is the process for return or replacement of TC1303A-ZI0EMF?
All TC1303A-ZI0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-ZI0EMF, 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-ZI0EMF part is unused and in its original packaging.
Return procedure for TC1303A-ZI0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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