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Microchip Technology TC1303B-AD0EMF
- Part No.:
- TC1303B-AD0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303B-AD0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,690
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Product details
Overview
TC1303B-AD0EMF 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 focused on the LDO output. It delivers 1.8V buck output and 3.3V LDO output, operates from 2.7–5.5V input, achieves >90% peak efficiency at 2.0 MHz switching frequency, and supports -40°C to +125°C junction temperature - ideal for portable medical instruments and USB-powered devices requiring tight voltage regulation and low quiescent current.
For engineers reviewing the TC1303B-AD0EMF datasheet, TC1303B-AD0EMF pinout, TC1303B-AD0EMF application, or TC1303B-AD0EMF equivalent, key selection criteria include its LDO-monitored PG output, independent shutdown control (SHDN1/SHDN2), 65 µA typical total quiescent current, 137 mV typical dropout at 200 mA, and compatibility with 1 µF ceramic output capacitors on both rails.
Technical Context
The TC1303B-AD0EMF implements a fixed-frequency 2.0 MHz PWM buck stage with automatic transition to PFM mode under light load to minimize IQ, while the LDO uses internal compensation and requires only a single 1 µF ceramic capacitor. Its power-good signal is a push-pull output referenced exclusively to VOUT2 regulation (94% threshold, 300 ms delay), distinguishing it from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored).
Shutdown logic is fully independent: SHDN1 controls the buck regulator only, SHDN2 controls the LDO only, enabling flexible power sequencing without external timing components. Protection includes undervoltage lockout (2.55V nominal), overtemperature shutdown (165°C), and short-circuit limiting on both outputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA max - supports core voltage rails for low-power processors and FPGAs |
| LDO Output Current | 300 mA max - powers I/O, sensors, or communication interfaces with low noise |
| Quiescent Current | 65 µA typical total - enables multi-week battery life in always-on portable systems |
| LDO Dropout Voltage | 137 mV typical @ 200 mA - allows operation down to 3.437V input for 3.3V output |
| Switching Frequency | 2.0 MHz fixed - permits use of compact 4.7 µH inductors and reduces EMI filtering burden |
| Power-Good Logic | Push-pull, monitors VOUT2 only - eliminates need for external pull-up and simplifies reset timing for LDO-supplied peripherals |
| Operating Temp Range | -40°C to +125°C junction - qualified for industrial and automotive cabin applications |
Pinout & Package
TC1303B-AD0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal 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 | Active-high logic input (>45% VIN); enables/disables 300 mA LDO independently of buck stage |
| 2 VIN2 | LDO input supply | Accepts 2.7–5.5V; must be routed adjacent to VIN1 with minimal trace length to reduce coupling |
| 3 VOUT2 | LDO regulated output | Delivers fixed 3.3V (per AD0 suffix); requires ≥1 µF ceramic capacitor to AGND for stability |
| 4 PG | Power-good indicator | Push-pull output asserting high when VOUT2 reaches 94% of 3.3V; 300 ms delay enables processor reset timing |
| 5 AGND | Analog ground reference | Must connect to dedicated analog ground plane; separates noise-sensitive feedback paths from power return |
| 6 PGND | Power ground return | High-current return path for buck switch node; ties to AGND only at single point near EP |
| 7 LX | Buck switch node | Connects to external 4.7 µH inductor; requires tight layout to minimize EMI and voltage spikes |
| 8 VIN1 | Buck input supply | Accepts 2.7–5.5V; shares input source with VIN2 but requires local 4.7 µF decoupling |
| 9 SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN); enables/disables 500 mA buck regulator independently |
| 10 VFB1/VOUT1 | Buck feedback/output | Configured as fixed 1.8V output (AD0 suffix); connects directly to output capacitor for regulation |
Key Features
| Feature | Design Value |
|---|---|
| Independent dual shutdown | SHDN1 and SHDN2 allow staggered power-up/down of processor core (buck) and I/O (LDO) without external logic |
| LDO-monitored power-good | PG asserts only after VOUT2 stabilizes - ensures reliable reset for peripherals powered solely by the LDO |
| Internally compensated LDO | Eliminates need for external compensation network; supports stable regulation with only 1 µF ceramic output capacitor |
| PFM/PWM auto-transition | Seamlessly shifts from 2.0 MHz PWM to pulse-frequency modulation below ~10 mA load, cutting IQ without control-loop intervention |
| Thermal & UVLO protection | 165°C shutdown with 10°C hysteresis and 2.55V UVLO prevent damage during input brownouts or board-level overheating |
Applications
| Portable Medical Sensors | USB-Powered Test Equipment |
|---|---|
Use Scenario: Battery-operated glucose meter with LCD display and Bluetooth LE radio. IC Role / Device Role / Timing Role: TC1303B-AD0EMF supplies 1.8V to the MCU core and 3.3V to the BLE transceiver and display driver, while PG signals MCU reset once LDO rail is valid. Use Value: 65 µA quiescent current extends coin-cell life beyond 6 months; 137 mV LDO dropout enables full functionality down to 3.4V battery voltage. | Use Scenario: Handheld oscilloscope module drawing power exclusively from USB 2.0 port (5V ±5%). IC Role / Device Role / Timing Role: TC1303B-AD0EMF generates clean 1.8V analog front-end supply and 3.3V digital logic rail; PG initiates FPGA configuration after LDO stabilization. Use Value: 2.0 MHz switching avoids interference with 2.4 GHz BLE band; push-pull PG eliminates external pull-up resistor, reducing BOM count. |
| Industrial Handheld Terminals | Low-Power IoT Edge Nodes |
Use Scenario: Ruggedized barcode scanner operating in warehouses from -20°C to +70°C ambient. IC Role / Device Role / Timing Role: TC1303B-AD0EMF powers ARM Cortex-M4 (1.8V) and RS-485 transceiver (3.3V); independent SHDN2 enables quick LDO disable during sleep mode. Use Value: -40°C to +125°C rating ensures reliability across temperature extremes; 300 mA LDO output sustains RS-485 bias current during line faults. | Use Scenario: Battery-powered environmental sensor node transmitting data via LoRaWAN every 15 minutes. IC Role / Device Role / Timing Role: TC1303B-AD0EMF supplies 1.8V to ultra-low-power MCU and 3.3V to LoRa transceiver; PG triggers wake-up interrupt upon LDO readiness. Use Value: PFM mode reduces IQ to <10 µA during 14.9 min sleep interval; 1 µF LDO output cap minimizes footprint in space-constrained PCB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output PMIC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP16311-H/MS | Single-output 600 mA buck only; no integrated LDO or PG function - requires external LDO and reset supervisor | Suitable only when system has separate LDO or can tolerate added components and layout area | Select if higher buck current (600 mA) is required and LDO/PG can be implemented externally |
| TPS65023RSBR | Triple-output (2 buck + 1 LDO); 2.25 MHz switching; PG monitors primary buck only; 12-pin QFN | Over-specified for dual-rail needs; larger footprint and higher cost; lacks LDO-monitored PG | Choose only if third rail (e.g., memory I/O) is needed and LDO PG monitoring is not critical |
Compared with MCP16311-H/MS and TPS65023RSBR, TC1303B-AD0EMF uniquely integrates LDO-monitored power-good in a compact 10-pin DFN, delivering optimal BOM reduction and layout simplicity for dual-rail battery-powered systems where LDO rail integrity is mission-critical.
Availability
TC1303B-AD0EMF is available at Aetrix Electronics and suitable for portable medical instruments, USB-powered test equipment, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for TC1303B-AD0EMF 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, serving industrial, automotive, and consumer markets with high-reliability silicon solutions.
The TC1303 family targets space-constrained, battery-operated applications needing tightly regulated dual supplies - emphasizing low IQ, small footprint, and simplified power sequencing without external supervision.
FAQ
What output voltages does the TC1303B-AD0EMF provide?
The TC1303B-AD0EMF provides a fixed 1.8V output from its synchronous buck regulator (VOUT1) and a fixed 3.3V output from its low-dropout linear regulator (VOUT2), as indicated by the "AD0" suffix in the part number. These values are factory-trimmed and do not require external feedback resistors, simplifying design and improving accuracy across temperature and load conditions.
How does the power-good (PG) function operate in TC1303B-AD0EMF?
The PG pin in TC1303B-AD0EMF is a push-pull output that asserts high when the LDO output (VOUT2) reaches and maintains ≥94% of its nominal 3.3V value, with a built-in 300 ms delay. This behavior is specific to the TC1303B variant and differs from TC1303A (buck-monitored) and TC1303C/TC1304 (dual-monitored), making TC1303B-AD0EMF ideal for systems where LDO rail integrity is the critical reset condition.
Can TC1303B-AD0EMF operate from a single 3.6V lithium-ion cell?
Yes, TC1303B-AD0EMF supports input voltages from 2.7V to 5.5V, making it fully compatible with a single-cell Li-ion battery (nominal 3.6V, discharge range ~3.0–4.2V). At 3.3V output, its 137 mV typical dropout allows regulation down to 3.437V input - well within the usable battery range - and its 65 µA quiescent current preserves runtime during standby.
What is the minimum output capacitance required for the LDO (VOUT2) of TC1303B-AD0EMF?
The LDO output (VOUT2) of TC1303B-AD0EMF requires a minimum of 1 µF ceramic capacitor connected between VOUT2 and AGND for stability and transient response. The datasheet confirms stable operation with this value, and larger capacitance (e.g., 2.2 µF) may further improve load-step performance but is not required for basic functionality.
Does TC1303B-AD0EMF support independent enable control for each regulator?
Yes, TC1303B-AD0EMF provides fully independent shutdown control: SHDN1 enables/disables the 500 mA buck regulator, while SHDN2 enables/disables the 300 mA LDO. Both inputs are active-high logic-compatible (>45% VIN threshold), allowing precise sequencing - for example, powering up the LDO first to stabilize peripherals before enabling the MCU core rail.
TC1303B-AD0EMF 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:
- 3.3V, 500mA
- Voltage/Current - Output 2:
- 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-DFN (3x3)
TC1303B-AD0EMF FAQ
1.How can I place an order for TC1303B-AD0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-AD0EMF 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 TC1303B-AD0EMF reliable?
The price and inventory of TC1303B-AD0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-AD0EMF is usually 5 days.
3.What payment methods are accepted for TC1303B-AD0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-AD0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-AD0EMF?
TC1303B-AD0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-AD0EMF 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 TC1303B-AD0EMF?
For technical support, including TC1303B-AD0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-AD0EMF requirements.
6.How does Aetrix verify that TC1303B-AD0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303B-AD0EMF 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 TC1303B-AD0EMF meets industry standards.
7.What is the process for return or replacement of TC1303B-AD0EMF?
All TC1303B-AD0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-AD0EMF, 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 TC1303B-AD0EMF part is unused and in its original packaging.
Return procedure for TC1303B-AD0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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