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Microchip Technology TC115331EMTTR
- Part No.:
- TC115331EMTTR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-89-5/6
- Datasheet:
-
TC115331EMTTR.pdf
- Description:
- IC REG BOOST 3.3V 100MA SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,581
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Product details
Overview
TC115331EMTTR from Microchip Technology is a PFM/PWM step-up DC/DC converter optimized for 1–3-cell battery-powered systems, delivering a factory-programmed 3.3V output with 85% typical efficiency at 100 mA, 140 mA typical output current at VIN = 2.0V, and assured start-up at 0.9V. It integrates an internal N-channel switch (1.4 Ω typical Rswon) and requires only an external diode, inductor, and capacitor.
For engineers reviewing the TC115331EMTTR datasheet, TC115331EMTTR pinout, TC115331EMTTR application, or TC115331EMTTR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated SOT-89-5 pin functions, confirmed alternative options, and supply support for low-voltage portable power designs.
Technical Context
The TC115331EMTTR operates in dual-mode regulation: PWM mode above ~10% duty cycle for stable high-load performance, and automatic transition to PFM mode below that threshold-using fixed 17% typical (25% max) duty pulses-to maintain ultra-low 13 µA typical no-load supply current and boost light-load efficiency. Its PS pin serves as both power input and feedback voltage sense node, enabling bootstrap start-up from 0.9V.
Internal protection includes LX current limiting via oscillator frequency doubling when VLX exceeds 1.3V, preventing damage under overload; shutdown reduces supply current to ≤0.5 µA; and soft-start (4–20 ms) controls inrush. The device lacks internal diode or compensation components-external Schottky diode (e.g., MA735), 50–300 µH inductor, and low-ESR output capacitor are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Factory-programmed 3.3V ±2.5%; enables direct replacement of 3.3V LDOs in space-constrained battery systems without feedback resistor network. |
| Start-Up Voltage | 0.9V min; allows operation from single alkaline or NiMH cell at end-of-life, critical for pagers and palmtops. |
| Efficiency | 85% typical at 100 mA; sustains >75% efficiency down to 10 mA in PFM mode, extending runtime in intermittent-use devices. |
| Output Current | 140 mA typical at VIN = 2.0V; supports moderate-power peripherals like LCD backlights or RF modules in handhelds. |
| No-Load Supply Current | 13 µA typical; minimizes quiescent drain in always-on standby circuits such as pager alert receivers. |
| Oscillator Frequency | 100 kHz nominal (85–115 kHz); balances EMI control and inductor size-enables use of compact 100 µH ferrite cores. |
| LX Switch Ron | 1.4 Ω typical; limits conduction loss at 140 mA load to <200 mW, avoiding thermal derating in SOT-89 package. |
| Shutdown Current | ≤0.5 µA max; ensures negligible battery leakage during system sleep, essential for multi-week shelf life. |
Pinout & Package
SOT-89-5 plastic small-outline transistor package: 4.5 mm × 2.5 mm × 1.6 mm body, tab-connected GND, lead pitch 1.5 mm, tape-and-reel delivery (MTTR suffix). Thermal pad not present; PCB copper area under tab improves heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No connect | Internally unconnected; must remain floating-no routing or grounding permitted. |
| 2 (PS) | Power input & output voltage sense | Connects directly to regulated output; supplies chip bias and closes feedback loop-no external resistors required. |
| 3 (SHDN) | Active-high shutdown control | Logic high (>0.75V) enables regulation; logic low (<0.20V) disables oscillator and switch, reducing ICC to ≤0.5 µA. |
| 4 (LX) | Internal N-channel switch drain | Drives external inductor; peak current limited to 350 mA; voltage swing up to VIN + VF(diode). |
| 5 (GND) | Ground reference | Primary return path for PS, SHDN, and LX currents; must tie to single-point ground near input/output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM hybrid mode | Automatic shift to PFM below 10% duty cycle cuts no-load ICC to 13 µA while maintaining regulation-critical for battery longevity. |
| Integrated switch with Rswon | 1.4 Ω typical on-resistance enables 140 mA output without external MOSFET-reduces BOM count and layout area. |
| Bootstrap start-up | Operates from 0.9V input using inductor-coupled start-up current-eliminates need for auxiliary bias supply. |
| Frequency-doubling current limit | When LX voltage exceeds 1.3V during switch ON, oscillator doubles frequency to reduce conduction time-prevents thermal runaway without external sensing. |
| Soft-start timing | 10 ms typical rise time prevents output overshoot and inrush into large capacitive loads-avoids brown-out in downstream logic. |
Applications
| Pager Power Supply | Cellular Phone Subsystem |
|---|---|
|
Use Scenario: Powers RF receiver and LED alert circuit in compact pager with single AA battery. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V from decaying 0.9–1.5V battery source. Use Value: 0.9V start-up and 13 µA no-load current extend usable battery life by >30% versus PWM-only converters. |
Use Scenario: Supplies 3.3V to Bluetooth baseband IC in feature phone during call setup. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering 100 mA burst current with minimal thermal rise. Use Value: 85% efficiency at 100 mA reduces heat generation in sealed plastic housing-avoids derating at 40°C ambient. |
| Palmtop Memory Backup | Camera Flash Charging |
|
Use Scenario: Maintains SRAM retention voltage during main battery swap in PDAs. IC Role / Device Role / Timing Role: Low-quiescent-current booster sustaining 3.3V from backup coin cell. Use Value: ≤0.5 µA shutdown current enables >5-year backup life with CR2032 cell. |
Use Scenario: Charges flash capacitor from 1.5V alkaline cell in digital camera. IC Role / Device Role / Timing Role: High-current transient booster delivering 140 mA peak to capacitor bank. Use Value: 140 mA output at VIN = 2.0V enables sub-2-second flash recycle time without oversized inductors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX860ESA+ | Fixed 5.0V output; 100 kHz oscillator; 125 mA max output at 2.0V input; no PFM mode-higher 120 µA no-load current. | Requires output divider for 3.3V use; less suitable for ultra-low-power standby due to higher quiescent draw. | Select when 5V rail is needed or when design already uses MAX860 footprint; verify thermal margin at 140 mA. |
| TPS61200DRCR | Adjustable output (0.9–5.5V); 1.2 MHz switching; 1.2 A switch; integrated diode; 2.5 µA shutdown current. | Higher integration eliminates external diode but increases cost and board area; 1.2 MHz demands tighter layout for EMI control. | Prefer for new designs needing adjustable VOUT or >200 mA capability; avoid if strict SOT-89 footprint and 100 kHz EMI profile are required. |
Compared with MAX860ESA+ and TPS61200DRCR, TC115331EMTTR offers the lowest system-level BOM count for fixed 3.3V boost, smallest PCB footprint in SOT-89, and best-in-class 13 µA no-load current-making it optimal for legacy portable designs where cost, size, and battery life are prioritized over adjustability or ultra-high current.
Availability
TC115331EMTTR is available at Aetrix Electronics and suitable for pagers, cellular phone subsystems, and palmtop memory backup requiring stable component supply, long-lifecycle availability, and consistent parametric performance across production batches.
Supply support for TC115331EMTTR 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 Inc. is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified manufacturing and global technical support.
The TC115 product line delivers low-voltage, high-efficiency step-up conversion for battery-powered portable electronics-designed specifically to replace discrete boost circuits with minimal external components while maximizing runtime.
FAQ
What output voltage does TC115331EMTTR deliver, and is it adjustable?
TC115331EMTTR delivers a factory-programmed fixed 3.3V output with ±2.5% tolerance over temperature and load. It is not adjustable-the PS pin connects directly to the output for closed-loop regulation without external resistors. This simplifies design for applications requiring only 3.3V, such as powering microcontroller I/O rails or RF modules in handheld devices.
Can TC115331EMTTR start up from a single 1.2V NiMH cell?
Yes, TC115331EMTTR guarantees start-up at 0.9V, making it fully operational from a single 1.2V NiMH cell-even at end-of-discharge (0.9–1.0V). Its bootstrap start-up architecture draws initial current through the external inductor to ramp the PS voltage, enabling reliable turn-on without auxiliary circuitry.
What external components are mandatory for TC115331EMTTR operation?
TC115331EMTTR requires three mandatory external components: a Schottky diode (e.g., MA735 or 1N5817), an inductor (50–300 µH, e.g., Sumida CD-54 100 µH), and an output capacitor (≥47 µF low-ESR tantalum). Input bypass capacitance is strongly recommended but not strictly mandatory for basic functionality.
How does TC115331EMTTR behave when input voltage exceeds 3.3V?
When VIN exceeds the factory-programmed 3.3V output, TC115331EMTTR suspends regulation-supply current drops to 9 µA typical-and VIN couples to VOUT through the inductor and external diode. This creates a leakage path; system designers must add isolation (e.g., MOSFET switch or post-LDO) if uncontrolled conduction is unacceptable.
Is TC115331EMTTR pin-compatible with other TC115 variants like TC115301EMTTR?
Yes, all TC115xxyyEMTTR variants-including TC115301EMTTR (3.0V), TC115331EMTTR (3.3V), and TC115501EMTTR (5.0V)-share identical SOT-89-5 pinout, electrical interface, and functional block diagram. Only the factory-programmed output voltage differs; PCB layout and external components remain interchangeable across the series.
TC115331EMTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-89-5/6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.9V
- Voltage - Input (Max):
- 10V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-5
TC115331EMTTR FAQ
1.How can I place an order for TC115331EMTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC115331EMTTR 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 TC115331EMTTR reliable?
The price and inventory of TC115331EMTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC115331EMTTR is usually 5 days.
3.What payment methods are accepted for TC115331EMTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC115331EMTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC115331EMTTR?
TC115331EMTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC115331EMTTR 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 TC115331EMTTR?
For technical support, including TC115331EMTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC115331EMTTR requirements.
6.How does Aetrix verify that TC115331EMTTR is sourced from the original manufacturer or authorized distributors?
All TC115331EMTTR 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 TC115331EMTTR meets industry standards.
7.What is the process for return or replacement of TC115331EMTTR?
All TC115331EMTTR units undergo pre-shipment inspection (PSI). If there is an issue with TC115331EMTTR, 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 TC115331EMTTR part is unused and in its original packaging.
Return procedure for TC115331EMTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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