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Microchip Technology TC1303B-ZA0EUNTR
- Part No.:
- TC1303B-ZA0EUNTR
- Manufacturer:
- Microchip Technology
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1303B-ZA0EUNTR.pdf
- Description:
- IC REG DL BUCK/LNR SYNC 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,767
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Product details
Overview
TC1303B-ZA0EUNTR 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 exclusively on the LDO output (VOUT2). It delivers 1.8 V at 500 mA and 3.3 V at 300 mA, features 2.0 MHz fixed-frequency PWM switching, 65 µA typical quiescent current, and operates across –40°C to +125°C for portable medical instruments and USB-powered devices.
For engineers reviewing the TC1303B-ZA0EUNTR datasheet, TC1303B-ZA0EUNTR pinout, TC1303B-ZA0EUNTR application, or TC1303B-ZA0EUNTR equivalent, key selection criteria include LDO-monitored PG functionality, independent shutdown control per output, 137 mV typical dropout at 200 mA, internal compensation, and compatibility with 1 µF ceramic output capacitors on VOUT2.
Technical Context
The TC1303B-ZA0EUNTR implements a synchronous buck stage with PFM/PWM auto-transition and an independently controllable LDO stage, both internally compensated. Its power-good output is a push-pull signal tied solely to VOUT2 regulation, with 94% threshold high and 89% threshold low, plus 300 ms active delay for processor reset sequencing.
It supports adjustable (0.8–4.5 V) or fixed VOUT1 outputs and fixed VOUT2 options (1.5/1.8/2.5/3.3 V); the -ZA0EUNTR variant specifies VOUT1 = 1.8 V and VOUT2 = 3.3 V in a 10-pin 3×3 DFN package with exposed pad grounded to AGND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VOUT1 | 1.8 V fixed output; enables core voltage supply for low-power processors without external feedback resistors. |
| VOUT2 | 3.3 V fixed output; powers I/O rails or peripherals requiring stable bias with minimal external components. |
| IOUT1 Max | 500 mA; sufficient for ARM Cortex-M cores or FPGA configuration logic under peak load. |
| IOUT2 Max | 300 mA; supports USB PHYs, sensors, or display interfaces with tight noise requirements. |
| Quiescent Current | 65 µA typical; extends battery life in always-on subsystems like real-time clocks or wake-up monitors. |
| PG Function | Push-pull output monitoring only VOUT2; asserts valid after 300 ms delay when VOUT2 reaches ≥94% of 3.3 V. |
| Dropout Voltage | 137 mV typical @ 200 mA on VOUT2; ensures regulation down to VIN2 = 3.437 V, easing input supply design. |
Pinout & Package
TC1303B-ZA0EUNTR is housed in a thermally enhanced 10-pin 3×3 mm DFN package with exposed thermal pad (EP) connected to AGND. The pinout is validated per Microchip DS21949C-page 3 and page 5 schematic diagrams.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN2 | LDO shutdown control | Active-high logic input (>45% VIN2); enables/disables VOUT2 independently of buck stage. |
| 2 VIN2 | LDO input supply | Accepts 2.7–5.5 V; must be routed adjacent to VIN1 with minimal trace length to reduce noise coupling. |
| 3 VOUT2 | LDO regulated output | Delivers 3.3 V ±0.3%; requires ≥1 µF ceramic capacitor to AGND for stability and transient response. |
| 4 PG | Power-good indicator | Push-pull output asserting high when VOUT2 is within 94–96% of 3.3 V; 300 ms delay prevents false resets. |
| 5 AGND | Analog ground reference | Must connect to dedicated analog ground plane; separates noise-sensitive feedback paths from power return currents. |
| 6 PGND | Power ground return | High-current return path for buck switch node; isolated from AGND except at single-point star connection. |
| 7 LX | Buck switch node | Connects to external 4.7 µH inductor; requires low-inductance layout to minimize EMI and voltage spikes. |
| 8 VIN1 | Buck input supply | Shares input source with VIN2; minimum 2.7 V required, but must exceed VOUT1 + dropout (≥2.98 V for 1.8 V out). |
| 9 SHDN1 | Buck shutdown control | Active-high logic input (>45% VIN1); allows independent enable/disable of 1.8 V rail without affecting LDO. |
| 10 VFB1/VOUT1 | Buck feedback/output | Fixed 1.8 V output pin; no external divider needed-internal reference sets regulation point. |
Key Features
| Feature | Design Value |
|---|---|
| Independent shutdown per regulator | SHDN1 and SHDN2 allow staggered power sequencing-e.g., enable VOUT2 first to initialize peripherals before enabling processor core rail. |
| Internally compensated stages | Eliminates need for external compensation networks on either buck or LDO, reducing BOM count and layout area. |
| 2.0 MHz fixed-frequency PWM | Enables use of small 4.7 µH inductors and 4.7 µF ceramic input/output capacitors, minimizing solution footprint. |
| Automatic PWM-to-PFM transition | Maintains >85% efficiency at light loads (<10 mA), critical for standby power budgeting in battery-operated systems. |
| Overtemperature & short-circuit protection | Thermal shutdown triggers at 165°C with 10°C hysteresis; output short-circuit current limited to 240 mA average on VOUT2. |
Applications
| USB-Powered Portable Instrument | Handheld Medical Sensor Node |
|---|---|
Use Scenario: A portable blood glucose meter powered via micro-USB port with 5 V input, requiring clean 3.3 V for sensor interface and 1.8 V for ultra-low-power MCU. IC Role / Device Role / Timing Role: Dual-output PMIC providing regulated rails and synchronized power-good assertion to release MCU reset after both supplies stabilize. Use Value: Single-chip solution eliminates discrete LDO + buck controller combo; 137 mV LDO dropout enables operation down to 3.44 V input, extending usable battery range. | Use Scenario: Wireless ECG patch with coin-cell backup, where standby current must remain below 100 µA while maintaining ready-to-measure state. IC Role / Device Role / Timing Role: Power supervisor delivering 1.8 V core and 3.3 V analog front-end, with PG monitoring only the LDO to ensure sensor bias stability before data acquisition. Use Value: 65 µA total IQ and automatic PFM mode cut quiescent draw by >40% vs. fixed-frequency-only regulators, directly extending clinical-grade runtime. |
| Low-Power Industrial Controller | Embedded USB-C Peripheral |
Use Scenario: DIN-rail mounted temperature controller using 24 V DC input stepped to 5 V intermediate rail, then further regulated to 1.8 V/3.3 V for microcontroller and RS-485 transceiver. IC Role / Device Role / Timing Role: Secondary-stage dual regulator accepting 5 V input, with independent shutdown allowing firmware-controlled sleep/wake of communication interface without resetting main MCU. Use Value: SHDN2 control enables dynamic power gating of 3.3 V rail during idle periods, reducing system-wide leakage by up to 300 µA. | Use Scenario: USB-C audio adapter supporting both data and power delivery, requiring isolated 3.3 V for USB PHY and 1.8 V for DAC core, with strict EMI limits. IC Role / Device Role / Timing Role: Low-noise dual regulator with 2.0 MHz switching frequency placed away from sensitive analog sections, and PG used to gate USB enumeration until stable bias is confirmed. Use Value: Internal compensation and 1.8 µV/√Hz output noise on VOUT2 meet USB audio Class 2 jitter requirements without additional filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65023BRSBR | Triple-output (2 buck + 1 LDO), 2.25 MHz switching, higher IQ (120 µA), QFN-24 package | Supports three-rail systems; lacks LDO-monitored PG - monitors primary buck only | Choose when needing third rail or higher current (up to 600 mA per buck), but accept larger footprint and less precise LDO health monitoring. |
| RT8059ZSP | Dual buck only (no integrated LDO), 3 MHz switching, 25 µA IQ, WDFN-10 package | No linear regulator output - requires external LDO for noise-sensitive analog rails | Prefer when lowest possible quiescent current and highest switching frequency are critical, and system can accommodate discrete LDO for clean bias. |
Compared with TPS65023BRSBR and RT8059ZSP, the TC1303B-ZA0EUNTR uniquely combines LDO-monitored power-good, independent shutdown per output, and ultra-low 65 µA IQ in a compact DFN - making it optimal for space-constrained, battery-sensitive dual-rail systems where LDO stability is mission-critical.
Availability
TC1303B-ZA0EUNTR is available at Aetrix Electronics and suitable for USB-powered portable instruments, handheld medical sensor nodes, and low-power industrial controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TC1303B-ZA0EUNTR 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, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The TC1303 series was designed specifically for portable and battery-operated applications demanding high integration, low quiescent current, and reliable dual-voltage sequencing - targeting cellular phones, PDAs, and handheld medical instrumentation.
FAQ
What output voltages does the TC1303B-ZA0EUNTR provide?
The TC1303B-ZA0EUNTR provides two fixed output voltages: VOUT1 = 1.8 V (buck regulator, 500 mA max) and VOUT2 = 3.3 V (LDO, 300 mA max). These values are factory-configured for the -ZA0EUNTR variant and require no external feedback components. The LDO output is monitored by the power-good pin, which asserts only when VOUT2 reaches ≥94% of 3.3 V.
How does the power-good (PG) function operate on the TC1303B-ZA0EUNTR?
The TC1303B-ZA0EUNTR features a push-pull PG output that monitors only the LDO output (VOUT2), unlike TC1303A (monitors buck) or TC1303C (monitors both). It asserts high after a 300 ms delay once VOUT2 rises above 94% of its nominal 3.3 V value and remains asserted until VOUT2 falls below 89%. This behavior is confirmed in DS21949C-page 3 functional block diagram and page 9 electrical specs.
What package type and thermal characteristics apply to the TC1303B-ZA0EUNTR?
The TC1303B-ZA0EUNTR uses a 10-pin 3×3 mm DFN package with exposed thermal pad (EP), rated for θJA = 41°C/W on a 4-layer board with internal ground plane and two vias under the pad. Its operating junction temperature range is –40°C to +125°C, and thermal shutdown activates at +165°C with 10°C hysteresis - verified in DS21949C-page 10 and page 7 absolute maximum ratings.
Can the TC1303B-ZA0EUNTR operate from a single 3.6 V Li-ion battery?
Yes - the TC1303B-ZA0EUNTR supports input voltages from 2.7 V to 5.5 V on both VIN1 and VIN2. With VOUT1 = 1.8 V and VOUT2 = 3.3 V, the minimum input for VOUT2 is VIN2 ≥ VOUT2 + dropout = 3.3 V + 0.137 V = 3.437 V, well within the 3.6 V nominal battery range. Efficiency remains >85% at 100 mA load (DS21949C-page 12 Figure 2-8), confirming viable operation across discharge curve.
Does the TC1303B-ZA0EUNTR require external compensation components?
No - both the buck regulator and LDO stages of the TC1303B-ZA0EUNTR are internally compensated, as explicitly stated in the Features section of DS21949C-page 1. This eliminates the need for external RC networks on either feedback loop, simplifying layout and reducing bill-of-materials cost. The device achieves stable regulation with only the recommended 4.7 µH inductor and 4.7 µF/1 µF ceramic capacitors.
TC1303B-ZA0EUNTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
TC1303B-ZA0EUNTR FAQ
1.How can I place an order for TC1303B-ZA0EUNTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1303B-ZA0EUNTR 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-ZA0EUNTR reliable?
The price and inventory of TC1303B-ZA0EUNTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1303B-ZA0EUNTR is usually 5 days.
3.What payment methods are accepted for TC1303B-ZA0EUNTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1303B-ZA0EUNTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1303B-ZA0EUNTR?
TC1303B-ZA0EUNTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1303B-ZA0EUNTR 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-ZA0EUNTR?
For technical support, including TC1303B-ZA0EUNTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1303B-ZA0EUNTR requirements.
6.How does Aetrix verify that TC1303B-ZA0EUNTR is sourced from the original manufacturer or authorized distributors?
All TC1303B-ZA0EUNTR 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-ZA0EUNTR meets industry standards.
7.What is the process for return or replacement of TC1303B-ZA0EUNTR?
All TC1303B-ZA0EUNTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1303B-ZA0EUNTR, 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-ZA0EUNTR part is unused and in its original packaging.
Return procedure for TC1303B-ZA0EUNTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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