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Microchip Technology TC115501EMTTR
- Part No.:
- TC115501EMTTR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-89-5/6
- Datasheet:
-
TC115501EMTTR.pdf
- Description:
- IC REG BOOST 5V 100MA SOT89-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,719
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Product details
Overview
TC115501EMTTR from Microchip Technology is a PFM/PWM step-up DC/DC converter optimized for 1–3-cell battery-powered systems, delivering a factory-programmed 5.0V 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 TC115501EMTTR datasheet, TC115501EMTTR pinout, TC115501EMTTR application, or TC115501EMTTR equivalent, key selection considerations include its ultra-low 80 µA typical supply current in boost mode, PFM-mode operation for high light-load efficiency, shutdown current <0.5 µA, SOT-89-5 package footprint, and compatibility with Schottky diodes such as MA735 or 1N5817.
Technical Context
The TC115501EMTTR operates in dual-mode regulation: PWM mode above ~10% duty cycle for stable mid-to-heavy loads, and automatic transition to fixed-duty-cycle PFM mode (17% typical, 25% max) at light loads to minimize quiescent current. Its PS pin serves dual roles-supply input and output voltage sensing-enabling bootstrap start-up from as low as 0.9V without external bias.
Internal protection includes LX current limiting via oscillator frequency doubling when VLX exceeds 1.3V, preventing destructive overcurrent while maintaining regulation. The device lacks internal current limiting; peak switch current must be externally constrained below 350 mA, and system-level isolation is required during shutdown due to inherent VIN–VOUT leakage through the external inductor/diode path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V factory-programmed (±2.5% tolerance); enables direct +5V rail generation from single Li-ion or multi-cell alkaline/NiMH sources. |
| Start-up Voltage | 0.9V minimum; allows operation from deeply discharged 1-cell batteries or low-voltage energy harvesting sources. |
| Supply Current (Boost) | 80 µA typical; minimizes battery drain in active operation, critical for long standby life in pagers and palmtops. |
| Shutdown Current | <0.5 µA maximum; ensures near-zero power loss when disabled, supporting aggressive power gating strategies. |
| Oscillator Frequency | 100 kHz nominal (85–115 kHz range); balances EMI, inductor size, and efficiency for portable applications. |
| LX Switch Ron | 1.4 Ω typical; defines conduction loss and thermal rise under load; limits usable output current at low VIN. |
| Max Output Current | 140 mA typical at VIN = 2.0V; sets practical load capability for low-power peripherals like camera modules or RF front-ends. |
Pinout & Package
SOT-89-5 plastic small-outline transistor package (4.5 mm × 2.5 mm × 1.6 mm), surface-mount, with heat-tab on lead 2 for thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk. |
| 2 | PS | Power input and feedback sense node; connects directly to regulated output; supplies internal circuitry and closes regulation loop. |
| 3 | SHDN | Digital enable/disable control; logic-high (>0.75V) enables regulation; logic-low (<0.20V) reduces supply current to <0.5 µA. |
| 4 | LX | Switch node driving external inductor; drains internal N-channel MOSFET; requires low-inductance layout to minimize ringing and EMI. |
| 5 | GND | Power and signal reference ground; must be tied to a low-impedance ground plane adjacent to input/output capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| PFM/PWM auto-switching | Maintains >80% efficiency down to 1 mA load by reducing switching frequency and supply current in light-load conditions. |
| Integrated switch with soft-start | Eliminates external MOSFET and reduces BOM count; built-in soft-start limits inrush current during power-up. |
| 0.9V start-up capability | Enables use with single-cell LiFePO₄ (2.0–3.6V), NiMH (0.9–1.4V/cell), or alkaline (0.8–1.6V/cell) batteries without pre-bias. |
| No external compensation required | On-chip phase compensation simplifies design, eliminates tuning effort, and ensures stability across recommended component ranges. |
| Low-noise shutdown path | SHDN input disables oscillator and switch cleanly; residual VIN–VOUT leakage is predictable and manageable with external MOSFET isolation. |
Applications
| Cellular Phone Power Management | Pager Local +5V Supply |
|---|---|
|
Use Scenario: Generating stable +5V from a single 3.6V Li-ion battery to power USB interface ICs or display drivers in legacy GSM handsets. IC Role / Device Role / Timing Role: Primary step-up regulator providing isolated, regulated 5V rail with fast transient response to burst-mode RF transmission loads. Use Value: Enables compact, low-BOM-count power architecture with 85% efficiency at 100 mA and sub-1µA shutdown, extending talk time between charges. |
Use Scenario: Delivering clean +5V to microcontroller and RF transceiver in ultra-low-power two-way pagers operating from two AA alkaline cells (2.4–3.2V). IC Role / Device Role / Timing Role: Core DC/DC converter supplying main system voltage; PS pin feedback ensures tight regulation despite battery voltage decay. Use Value: 0.9V start-up supports full functionality until battery reaches end-of-life (~0.9V/cell), maximizing usable battery capacity. |
| Digital Camera Flash Charging | Palmtop System +5V Rail |
|
Use Scenario: Charging a 100 µF flash capacitor from a 1.5V AAA cell in compact digital video recorders requiring intermittent high-current pulses. IC Role / Device Role / Timing Role: High-efficiency boost stage feeding charge pump or capacitor bank; LX switching synchronized to flash trigger timing. Use Value: 140 mA output at 2.0V input enables rapid capacitor charging; PFM mode minimizes quiescent drain during standby between shots. |
Use Scenario: Providing regulated +5V to LCD controller, SD card interface, and IR transceiver in ARM-based palmtop PDAs powered by three NiMH cells (3.6–4.2V). IC Role / Device Role / Timing Role: Main system supply regulator; SHDN pin controlled by host processor to gate power during sleep modes. Use Value: 80 µA typical operating current and <0.5 µA shutdown current extend battery life in always-on portable computing devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC/DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Charge-pump topology (no inductor); fixed 5V output; 100 mA max; requires two flying capacitors. | Lower EMI and smaller solution size but limited to lighter loads and no adjustable output. | Prefer MAX680ESA+ for space-constrained, low-noise, ≤50 mA applications where inductor avoidance is critical. |
| TPS61200DRCR | Adjustable output (0.9–5.5V); 1.2A switch current; 95% peak efficiency; integrated synchronous rectifier. | Supports wider input range (0.3–5.5V) and higher output current, but larger QFN package and higher BOM cost. | Choose TPS61200DRCR when dynamic output voltage control, >200 mA load, or superior efficiency across wide VIN/VOUT ratios is required. |
Compared with MAX680ESA+, TC115501EMTTR delivers higher output current and better light-load efficiency using an inductor-based topology; versus TPS61200DRCR, it offers lower system cost and simpler layout at the expense of adjustability and peak current capability.
Availability
TC115501EMTTR is available at Aetrix Electronics and suitable for cellular phones, pagers, and palmtop computers requiring stable component supply with long-term lifecycle support and consistent parametric performance.
Supply support for TC115501EMTTR 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS-16949 certified wafer fabrication and design facilities.
The TC115 family was designed specifically for ultra-low-voltage, battery-powered portable electronics-emphasizing minimal quiescent current, robust start-up behavior, and minimal external component count in space-constrained SOT-89 packaging.
FAQ
What is the factory-programmed output voltage of the TC115501EMTTR?
The TC115501EMTTR is factory-programmed for a nominal 5.0V output voltage, with ±2.5% tolerance over temperature and line conditions. This value is encoded in the part number suffix "50" and cannot be adjusted externally-the PS pin provides feedback only for closed-loop regulation around this fixed setpoint.
Can the TC115501EMTTR operate with input voltage higher than 5.0V?
No-TC115501EMTTR is designed strictly as a step-up (boost) converter. When VIN exceeds the factory-programmed 5.0V output, regulation suspends and supply current drops to ~9 µA typical. VIN couples directly to VOUT through the inductor and external diode, creating a leakage path that requires external isolation (e.g., MOSFET switch) in system design.
What external components are mandatory for TC115501EMTTR operation?
TC115501EMTTR requires three mandatory external components: a Schottky diode (e.g., MA735 or 1N5817), an inductor (50–300 µH, ferrite core, <0.1 Ω DCR), and an output capacitor (≥47 µF tantalum with low ESR). An input bypass capacitor is strongly recommended but not strictly mandatory for basic functionality.
How does the TC115501EMTTR achieve high efficiency at light loads?
The TC115501EMTTR achieves high light-load efficiency by automatically switching from PWM to pulse frequency modulation (PFM) mode when output load demands <10% duty cycle. In PFM mode, it delivers fixed-width pulses only as needed to maintain regulation, reducing average switching losses and lowering supply current to 13–26 µA at no load.
Is the NC pin on TC115501EMTTR safe to connect to ground or leave floating?
The NC pin (Pin 1) on TC115501EMTTR has no internal connection and must remain unconnected-neither grounded nor tied to any other net. Connecting it may introduce parasitic capacitance or leakage paths that degrade startup reliability or cause unexpected oscillation, as confirmed in the official DS21361D datasheet Pin Function Table.
TC115501EMTTR 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):
- 5V
- 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
TC115501EMTTR FAQ
1.How can I place an order for TC115501EMTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC115501EMTTR 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 TC115501EMTTR reliable?
The price and inventory of TC115501EMTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC115501EMTTR is usually 5 days.
3.What payment methods are accepted for TC115501EMTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC115501EMTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC115501EMTTR?
TC115501EMTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC115501EMTTR 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 TC115501EMTTR?
For technical support, including TC115501EMTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC115501EMTTR requirements.
6.How does Aetrix verify that TC115501EMTTR is sourced from the original manufacturer or authorized distributors?
All TC115501EMTTR 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 TC115501EMTTR meets industry standards.
7.What is the process for return or replacement of TC115501EMTTR?
All TC115501EMTTR units undergo pre-shipment inspection (PSI). If there is an issue with TC115501EMTTR, 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 TC115501EMTTR part is unused and in its original packaging.
Return procedure for TC115501EMTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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