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Microchip Technology TC1303A-ZP0EMF
- Part No.:
- TC1303A-ZP0EMF
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
TC1303A-ZP0EMF.pdf
- Description:
- IC REG DL BUCK/LINEAR SYNC 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,010
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Product details
Overview
TC1303A-ZP0EMF 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% typical efficiency at 2.0 MHz switching frequency, features 65 µA total quiescent current, and supports adjustable (0.8–4.5 V) or fixed VOUT1 outputs. It is used in portable medical instruments requiring stable dual-rail power with processor reset signaling.
For engineers reviewing the TC1303A-ZP0EMF datasheet, TC1303A-ZP0EMF pinout, TC1303A-ZP0EMF application, or TC1303A-ZP0EMF equivalent, key selection considerations include its buck-only power-good monitoring, independent shutdown control for each regulator, 137 mV LDO dropout at 200 mA, -40°C to +125°C junction temperature rating, and compatibility with 1 µF ceramic output capacitors on the LDO rail.
Technical Context
The TC1303A-ZP0EMF implements a fixed-frequency 2.0 MHz PWM buck stage with automatic transition to PFM mode under light load to maintain ultra-low quiescent current. Its internal compensation eliminates external loop components, and the buck output is sensed directly at VFB1/VOUT1 for precise regulation.
The integrated 300 mA LDO operates independently with dedicated VIN2 input, enabling separate input sourcing or noise isolation. Its power-good signal (PG) is an open-drain output tied exclusively to VOUT1 regulation status, with 300 ms delay optimized for processor reset timing - distinct from TC1303B (LDO-monitored PG) and TC1303C/TC1304 (dual-monitored PG).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 500 mA maximum - supports core voltage rails for low-power microcontrollers and DSPs without external current boosting. |
| LDO Output Current | 300 mA maximum - powers auxiliary circuits such as sensors, I/O interfaces, or RF bias rails with minimal board area. |
| Quiescent Current | 65 µA typical total - enables multi-week battery life in always-on portable medical devices with intermittent active duty cycles. |
| Buck Switching Frequency | 2.0 MHz fixed (1.6–2.4 MHz range) - allows use of compact 4.7 µH inductors and reduces EMI filtering requirements. |
| LDO Dropout Voltage | 137 mV typical @ 200 mA - ensures stable 2.5 V or 3.3 V output even with Li-ion battery sag down to 2.7 V input. |
| Power-Good Monitoring | Monitors only VOUT1 (buck) with 94% threshold and 300 ms delay - provides reliable reset assertion for processors dependent on the primary supply rail. |
| Operating Temperature | -40°C to +125°C junction - qualified for industrial and medical environments where thermal margin is critical. |
Pinout & Package
TC1303A-ZP0EMF is housed in a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), compatible with standard reflow profiles and offering 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 input | Active-high logic input (>45% VIN); enables independent disable of LDO output without affecting buck regulator operation. |
| 2 VIN2 | LDO input supply | Dedicated analog input pin for LDO stage; must be routed close to VIN1 to minimize noise coupling and ensure stable regulation. |
| 3 VOUT2 | LDO regulated output | 300 mA capable output requiring ≥1 µF ceramic capacitor to AGND for stability and transient response. |
| 4 PG | Power-good indicator | Open-drain output asserted low when VOUT1 reaches ≥94% of target; requires external pull-up for system reset logic. |
| 5 AGND | Analog ground reference | Separate ground return for feedback and sensing circuitry; must be connected to quiet analog ground plane, not power ground. |
| 6 PGND | Power ground return | High-current return path for buck switch node (LX); requires low-inductance connection to minimize switching noise. |
| 7 LX | Buck switch node | Connection point for external inductor; carries high di/dt switching current - layout critical for EMI and efficiency. |
| 8 VIN1 | Buck input supply | Main input for buck regulator; shares same source as VIN2 but routed separately to reduce cross-regulator interference. |
| 9 SHDN1 | Buck shutdown control input | Active-high logic input (>45% VIN); allows independent enable/disable of buck stage while LDO remains operational. |
| 10 VFB1/VOUT1 | Buck feedback or output | For adjustable versions: connects to resistor divider; for fixed-output variants like TC1303A-ZP0EMF, functions as VOUT1 output pin. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown control | SHDN1 and SHDN2 allow staged power sequencing - e.g., keep LDO active for real-time clock during buck sleep mode. |
| Internally compensated regulators | Eliminates need for external compensation networks on both buck and LDO loops, reducing BOM count and layout complexity. |
| Low-noise PFM/PWM transition | Seamless shift from 2.0 MHz PWM to pulse-frequency modulation below ~10 mA load preserves efficiency without audible switching noise. |
| Robust protection suite | Includes undervoltage lockout (2.55 V nominal), overtemperature shutdown (165°C), and short-circuit protection on both outputs. |
| Small-footprint packaging | 3×3 mm DFN-10 with exposed pad enables high-density power solutions in space-constrained handheld medical enclosures. |
Applications
| Portable Medical Instrumentation | USB-Powered Diagnostic Device |
|---|---|
|
Use Scenario: Battery-powered glucose meter with LCD display, Bluetooth LE radio, and precision analog front-end. IC Role / Device Role / Timing Role: Dual-rail power source: buck supplies 1.8 V to MCU core; LDO supplies clean 3.3 V to RF transceiver and sensor interface. Use Value: 65 µA quiescent current extends single-cell Li-ion battery life beyond 6 months in standby; 300 ms PG delay ensures reliable MCU reset after cold start. |
Use Scenario: USB bus-powered ECG patch with analog acquisition, digital processing, and wireless telemetry. IC Role / Device Role / Timing Role: Primary power manager converting 5 V USB input to 1.2 V (MCU core) and 2.5 V (ADC reference/LNA bias). Use Value: 2.0 MHz switching frequency enables use of miniature 4.7 µH inductor; 137 mV LDO dropout maintains 2.5 V output even as USB voltage sags to 4.4 V. |
| Handheld Industrial Scanner | Low-Power Wearable Sensor Hub |
|
Use Scenario: Rugged barcode scanner powered by removable Li-ion pack, featuring laser driver, imager, and BLE connectivity. IC Role / Device Role / Timing Role: Central PMIC delivering 3.3 V (imager interface), 1.5 V (laser diode bias), and PG signal for system initialization. Use Value: Independent SHDN1/SHDN2 pins allow dynamic power gating: disable laser LDO during idle while keeping imager rail active for wake-on-scan. |
Use Scenario: Multi-sensor wearable (accelerometer, HRM, SpO₂) operating from coin-cell battery with multi-week runtime. IC Role / Device Role / Timing Role: Efficient dual-output regulator supplying 0.9 V to ultra-low-power MCU and 1.8 V to analog sensor array. Use Value: PFM mode operation below 10 mA load reduces average current draw to <1 µA during deep-sleep intervals, maximizing battery longevity. |
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-ZP0EMF | PG monitors LDO output (VOUT2) instead of buck output; push-pull PG output vs. open-drain. | Suitable when system reset must be triggered by auxiliary rail stability (e.g., sensor bias supply) rather than core voltage. | Select TC1303B-ZP0EMF if LDO-supplied subsystems require guaranteed power-good assertion before main processor boot. |
| TPS65023RGTR | Triple-output PMIC (2 buck + 1 LDO); higher integration but larger 4×4 mm QFN package and 100 µA IQ. | Targets more complex systems needing three independent rails (e.g., application processor + memory + peripheral I/O). | Choose TPS65023RGTR only when third regulated output is required and board space permits larger footprint and higher quiescent current. |
Compared with TC1303B-ZP0EMF, TC1303A-ZP0EMF provides earlier reset assertion tied to core rail readiness; versus TPS65023RGTR, it offers lower IQ and smaller size at the cost of one fewer output - ideal for cost- and space-sensitive dual-rail designs.
Availability
TC1303A-ZP0EMF is available at Aetrix Electronics and suitable for portable medical instrumentation, USB-powered diagnostic devices, and handheld industrial scanners requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for TC1303A-ZP0EMF 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 U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs for industrial, automotive, and medical applications.
The TC1303 family was designed to deliver highly integrated, low-quiescent-current dual-output regulation for battery-powered portable electronics where board space, thermal performance, and standby efficiency are critical constraints.
FAQ
What is the power-good (PG) monitoring behavior of TC1303A-ZP0EMF?
The TC1303A-ZP0EMF monitors only the buck regulator output (VOUT1) for power-good assertion. Its PG pin is an open-drain output that goes low when VOUT1 reaches ≥94% of its target voltage, with a built-in 300 ms delay to prevent false resets during startup transients. This behavior is fixed for the TC1303A variant and differs from TC1303B (LDO-monitored) and TC1303C/TC1304 (dual-monitored). The TC1303A-ZP0EMF does not monitor VOUT2 for PG.
Can TC1303A-ZP0EMF support adjustable VOUT1 output voltages?
No - TC1303A-ZP0EMF is a fixed-output variant. The "ZP0EMF" suffix indicates factory-trimmed VOUT1 = 1.2 V and VOUT2 = 2.5 V. Adjustable versions (e.g., TC1303A-182E) use different suffixes and require external resistor dividers on the VFB1 pin. The TC1303A-ZP0EMF connects VFB1 directly to VOUT1 internally and does not support external feedback configuration.
What is the recommended output capacitance for VOUT2 on TC1303A-ZP0EMF?
The TC1303A-ZP0EMF requires a minimum 1 µF ceramic capacitor between VOUT2 and AGND for stable LDO operation and adequate transient response. Microchip's DS21949C specifies 1 µF as sufficient for all standard VOUT2 options (1.5 V, 1.8 V, 2.5 V, 3.3 V). Larger values (e.g., 2.2 µF) may improve ripple rejection but are not required. X5R or X7R dielectrics are preferred for stable capacitance across temperature and bias.
How does the shutdown functionality work on TC1303A-ZP0EMF?
The TC1303A-ZP0EMF features two independent shutdown inputs: SHDN1 controls the buck regulator and SHDN2 controls the LDO. Both are active-high logic inputs requiring >45% of VIN to enable. Driving either pin low disables its respective regulator while leaving the other functional - enabling flexible power sequencing. For example, SHDN2 can be held high to keep VOUT2 active for RTC backup while SHDN1 toggles the main core rail.
What thermal performance can be expected from TC1303A-ZP0EMF in DFN package?
In its 3×3 mm DFN-10 package with exposed pad, TC1303A-ZP0EMF 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. At full 500 mA buck + 300 mA LDO load, dissipation remains within safe limits up to +85°C ambient - verified by Microchip's thermal characterization in DS21949C-page 10. Derating is recommended above 100°C junction temperature.
TC1303A-ZP0EMF 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:
- 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-DFN (3x3)
TC1303A-ZP0EMF FAQ
1.How can I place an order for TC1303A-ZP0EMF through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303A-ZP0EMF 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-ZP0EMF reliable?
The price and inventory of TC1303A-ZP0EMF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303A-ZP0EMF is usually 5 days.
3.What payment methods are accepted for TC1303A-ZP0EMF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303A-ZP0EMF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303A-ZP0EMF?
TC1303A-ZP0EMF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303A-ZP0EMF 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-ZP0EMF?
For technical support, including TC1303A-ZP0EMF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303A-ZP0EMF requirements.
6.How does Aetrix verify that TC1303A-ZP0EMF is sourced from the original manufacturer or authorized distributors?
All TC1303A-ZP0EMF 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-ZP0EMF meets industry standards.
7.What is the process for return or replacement of TC1303A-ZP0EMF?
All TC1303A-ZP0EMF units undergo pre-shipment inspection (PSI). If there is an issue with TC1303A-ZP0EMF, 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-ZP0EMF part is unused and in its original packaging.
Return procedure for TC1303A-ZP0EMF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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