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Microchip Technology TC828AECTTR
- Part No.:
- TC828AECTTR
- Manufacturer:
- Microchip Technology
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TC828AECTTR.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,157
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Product details
Overview
TC828AECTTR from TelCom Semiconductor is a CMOS switched-capacitor voltage converter in a 5-pin SOT-23A package, performing voltage inversion (e.g., +5V → –5V) with >95% power efficiency, 38µA quiescent current, and operation from +1.8V to +5.5V input. It delivers up to 25mA output current for LCD bias generation in portable electronics.
For engineers reviewing the TC828AECTTR datasheet, TC828AECTTR pinout, TC828AECTTR application, or TC828AECTTR equivalent, key selection criteria include unregulated inverting topology, 12kHz fixed-frequency operation, 25Ω typical output resistance at +25°C, and minimal external component count (two 10µF capacitors).
Technical Context
The TC828AECTTR implements a two-phase charge-pump architecture using integrated MOSFET switches and an on-chip 12kHz oscillator. It requires no inductors and operates without regulation-output voltage droops linearly with load current per VOUT = –(VIN – IOUT × ROUT).
Its internal design integrates control logic, oscillator, and power switches; external components are limited to two commutation capacitors (C1, C2). Output impedance is dominated by switching frequency, capacitor values, and ESR, with ROUT ≈ 25Ω nominal at +5V/25°C and rising to 65Ω across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Unregulated inverting charge pump - outputs inverted voltage with linear droop under load |
| Input Voltage Range | +1.8V to +5.5V - supports single-cell Li-ion, NiMH, and 3.3V/5V logic rails |
| Output Current | Up to 25mA - sufficient for segment LCD bias in handhelds and PDAs |
| Quiescent Current | 38µA typical - enables ultra-low-power operation in battery-backed systems |
| Oscillator Frequency | 12kHz typical (6–20kHz range) - defines ripple frequency and output impedance scaling |
| Power Efficiency | 96% typical at +25°C - minimizes thermal impact and extends battery life |
| Output Resistance | 25Ω typical at +25°C, 65Ω max over temperature - determines voltage droop under load |
Pinout & Package
TC828AECTTR is housed in a 5-pin SOT-23A (EIAJ SC-74A) surface-mount package, measuring 3.10 mm × 1.90 mm × 1.45 mm, with gull-wing leads and pin 1 marked by a dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Inverting output terminal | Delivers negative voltage referenced to GND; sinks load current; must not be pulled above GND |
| 2 (VIN) | Positive supply input | Accepts +1.8V to +5.5V; requires local bypass capacitor depending on load configuration |
| 3 (C–) | Commutation capacitor negative terminal | Connects to negative side of C1; forms charge-transfer path during phase 2 |
| 4 (GND) | Ground reference | System ground return; must be low-impedance and co-located with C1/C2 |
| 5 (C+) | Commutation capacitor positive terminal | Connects to positive side of C1; forms charge-transfer path during phase 1 |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion without inductors | Enables compact, EMI-quiet negative rail generation in space-constrained portable PCBs |
| Two-capacitor operation | Reduces BOM count and layout area-only C1 (pump) and C2 (reservoir) required for basic inverter |
| 12kHz fixed-frequency switching | Ensures predictable ripple frequency and simplifies filtering vs. variable-frequency charge pumps |
| 25mA output capability | Supports multi-segment LCD biasing in pagers, PDAs, and dataloggers without external boost stages |
| –40°C to +85°C operation | Validated performance across industrial and consumer ambient ranges without derating |
Applications
| LCD Panel Bias | Cellular Phones |
|---|---|
Use Scenario: Generating negative bias voltage for STN or segment LCD displays requiring dual-rail supplies. IC Role / Device Role / Timing Role: Unregulated inverting voltage converter providing VSS rail referenced to system GND. Use Value: Eliminates need for discrete inductor-based DC/DC converters, reducing cost and board area while maintaining <25mA drive capability. | Use Scenario: Supplying negative voltage for RF front-end IC bias or analog subsystems in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Low-quiescent-current charge pump delivering stable –VIN for low-noise analog blocks. Use Value: 38µA IDD enables extended standby time; 12kHz ripple is easily filtered in RF-shielded sections. |
| Pagers | Portable Dataloggers |
Use Scenario: Powering display drivers and memory backup circuits in compact, battery-operated paging receivers. IC Role / Device Role / Timing Role: Inverting converter operating from single 3V coin cell or alkaline stack. Use Value: 1.8V minimum VIN allows operation down to near end-of-life battery voltage, extending usable runtime. | Use Scenario: Providing negative supply for op-amps, ADC references, or sensor signal conditioning in field-deployable instruments. IC Role / Device Role / Timing Role: Compact, low-power inverter supporting precision analog circuitry in isolated measurement nodes. Use Value: 96% efficiency minimizes self-heating in sealed enclosures; SOT-23A footprint eases integration into dense sensor modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Higher 100kHz switching frequency; 20mA output; requires 1µF capacitors | Better ripple performance but higher EMI sensitivity; less suitable for noise-critical RF sections | Prefer MAX680ESA+ when lower output ripple and smaller capacitors are prioritized over quiescent current |
| ICL7660ACPA+ | Wider –40°C to +125°C temp range; 10mA output; 10kHz oscillator; higher 120µA quiescent current | Compatible with automotive under-hood environments but insufficient for 25mA LCD bias loads | Choose ICL7660ACPA+ only if extended temperature rating is mandatory and load current ≤10mA |
Compared with MAX680ESA+ and ICL7660ACPA+, the TC828AECTTR offers optimal balance of low quiescent current (38µA), 25mA output drive, and 12kHz switching for portable LCD bias-making it preferred where battery life and moderate load capability are primary constraints.
Availability
TC828AECTTR is available at Aetrix Electronics and suitable for LCD panel bias, cellular phone subsystems, pagers, portable dataloggers, and battery-powered devices requiring stable component supply and long-term manufacturability.
Supply support for TC828AECTTR 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
TelCom Semiconductor was a fabless analog IC designer specializing in power management, interface, and timing solutions before its acquisition by Microchip Technology in 2002.
The TC828AECTTR belongs to TelCom's switched-capacitor voltage converter product line, engineered specifically for low-power, inductorless negative rail generation in portable consumer electronics.
FAQ
What is the maximum continuous output current specification for TC828AECTTR?
The TC828AECTTR is rated for up to 25mA continuous output current under typical conditions (TA = +25°C, VIN = +5V, C1 = C2 = 10µF). Absolute maximum output current is 50mA, but sustained operation above 25mA increases output droop and thermal stress. For reliable long-term operation, design to ≤25mA load with appropriate derating at elevated temperatures.
Does TC828AECTTR provide regulated output voltage?
No, the TC828AECTTR is an unregulated charge-pump inverter. Its output voltage follows VOUT ≈ –(VIN – IOUT × ROUT), where ROUT is ~25Ω at +25°C. Output droop is linear with load current and varies with temperature and input voltage. External regulation or post-filtering is required for stable voltage rails.
What capacitor values are recommended for TC828AECTTR in standard inverter configuration?
TelCom specifies 10µF nominal for both C1 (commutation) and C2 (reservoir) in standard inverter use. Lower ESR ceramic or tantalum capacitors are strongly recommended. Increasing C1 reduces output resistance (e.g., 47µF lowers ROUT to ~18.3Ω); increasing C2 reduces output ripple (e.g., 47µF cuts VRIPPLE to ~20mV at 10mA).
Can TC828AECTTR be used to generate a doubled positive voltage?
Yes-though not its primary mode, the TC828AECTTR can be configured as a voltage doubler using additional diodes and capacitors (per Figure 6 in the datasheet). However, combined inverter/doubler operation limits total output current to ≤40mA across both rails, and regulation is still absent on either output.
Is TC828AECTTR pin-compatible with earlier TelCom variants like TC828ECT?
Yes, TC828AECTTR shares identical pinout, package (5-pin SOT-23A), and functional interface with TC828ECT. The "A" suffix denotes improved specifications-including lower quiescent current (38µA vs. 80µA typical) and tighter ROUT tolerance-while maintaining full electrical and mechanical compatibility.
TC828AECTTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Positive or Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
TC828AECTTR FAQ
1.How can I place an order for TC828AECTTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC828AECTTR 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 TC828AECTTR reliable?
The price and inventory of TC828AECTTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC828AECTTR is usually 5 days.
3.What payment methods are accepted for TC828AECTTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC828AECTTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC828AECTTR?
TC828AECTTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC828AECTTR 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 TC828AECTTR?
For technical support, including TC828AECTTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC828AECTTR requirements.
6.How does Aetrix verify that TC828AECTTR is sourced from the original manufacturer or authorized distributors?
All TC828AECTTR 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 TC828AECTTR meets industry standards.
7.What is the process for return or replacement of TC828AECTTR?
All TC828AECTTR units undergo pre-shipment inspection (PSI). If there is an issue with TC828AECTTR, 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 TC828AECTTR part is unused and in its original packaging.
Return procedure for TC828AECTTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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