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Microchip Technology TC1220ECHTR
- Part No.:
- TC1220ECHTR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-6
- Datasheet:
-
TC1220ECHTR.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,511
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Product details
Overview
TC1220ECHTR from Microchip Technology is a CMOS charge-pump voltage inverter IC in a 6-pin SOT-23A package, operating from +2.5V to +5.5V input, delivering up to 25mA output current with >95% voltage conversion efficiency and 35kHz oscillator frequency. It provides unregulated negative output (VOUT ≈ –VIN) for biasing LCD panels in portable battery-powered systems.
For engineers reviewing the TC1220ECHTR datasheet, TC1220ECHTR pinout, TC1220ECHTR application, or TC1220ECHTR equivalent, key selection criteria include shutdown logic compatibility with 1.8V systems, output resistance (~25Ω at +25°C), low-quiescent-current operation (115µA typical), and external capacitor requirements (C1 = C2 = 3.3µF).
Technical Context
The TC1220ECHTR implements a two-phase switched-capacitor topology with integrated power MOSFETs, oscillator, and control logic. Its 35kHz fixed-frequency operation enables predictable ripple and output impedance behavior, while the active-low SHDN pin reduces supply current to <1µA during disable.
Unlike regulated converters, it delivers unregulated inverted output voltage that droops linearly with load (VDROP = IOUT × ROUT). Output stability relies on external low-ESR capacitors-C1 sets output resistance, C2 governs ripple-and no feedback loop or regulation circuitry is present on-die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 35 kHz typical - determines switching period, output ripple magnitude, and optimal capacitor sizing (C1/C2) |
| Supply Current | 115 µA typical at VIN = 5V - defines quiescent power draw in active mode; impacts battery life in always-on bias rails |
| Shutdown Current | <1 µA - enables ultra-low-power sleep states without external disconnect circuitry |
| Output Resistance | 25 Ω nominal at +25°C, VIN = 5V - directly determines output voltage droop under load (VDROP = IOUT × 25Ω) |
| Input Voltage Range | +2.5V to +5.5V - supports single-cell Li-ion (3.0–4.2V), 3.3V logic rails, and dual-cell alkaline (3.0–3.6V) |
| Max Output Current | 25 mA - sets maximum usable load for stable VOUT ≥ –4.0V at VIN = 4.75V |
| Voltage Conversion Efficiency | 95% typical - minimizes heat generation and input power waste in space-constrained portable designs |
Pinout & Package
Package: 6-pin SOT-23A (EIAJ SC-74), 3.00 mm × 1.75 mm footprint, 1.45 mm max height, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge pump output | Delivers negative voltage rail (≈ –VIN); connects to load and reservoir capacitor C2 |
| 2 - VIN | Positive input supply | Accepts +2.5V to +5.5V; requires local bypass capacitor to suppress switching noise |
| 3 - C– | Commutation capacitor negative terminal | Connects to negative side of flying capacitor C1; critical node for charge transfer phase timing |
| 4 - GND | Ground reference | Common return for VIN, SHDN, and output load; must be low-impedance for stable switching |
| 5 - SHDN | Active-low shutdown control | Logic low (<0.5V) disables internal oscillator and disconnects VIN from OUT; compatible with 1.8V logic |
| 6 - C+ | Commutation capacitor positive terminal | Connects to positive side of flying capacitor C1; alternates polarity with C– during pumping cycles |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion only | Generates clean –VIN output without regulation; ideal for fixed-ratio bias where load current is predictable and stable |
| Ultra-small 6-pin SOT-23A | Enables integration into tight spaces (e.g., display bezels, handheld PCBs) without requiring external inductors or transformers |
| Two-capacitor operation | Minimizes BOM count and board area-only C1 (flying) and C2 (reservoir) required for basic inverter function |
| 35 kHz fixed oscillator | Optimized trade-off between capacitor size (lower fOSC → larger C needed) and EMI profile (higher fOSC → easier filtering) |
| 1.8V logic-compatible SHDN | Allows direct interface with modern low-voltage microcontrollers and ASICs without level-shifting circuitry |
Applications
| LCD Panel Bias | Cellular Phone Display |
|---|---|
Use Scenario: Providing negative gate bias (VGL) for TFT-LCD source driver ICs in handheld displays. IC Role / Device Role / Timing Role: Unregulated voltage inverter generating –5V rail from 3.3V or 5V system supply. Use Value: Eliminates need for discrete inductor-based DC/DC inverters; achieves <25Ω output impedance to maintain stable VGL under dynamic pixel loading. | Use Scenario: Supplying contrast-adjustable negative bias to monochrome or color STN LCD modules in GSM handsets. IC Role / Device Role / Timing Role: Compact, low-noise charge pump delivering –3V to –4.5V for LCD common electrode (VCOM) drive. Use Value: Supports rapid on/off cycling via SHDN pin to reduce standby current; 115µA quiescent draw extends talk time in battery-limited form factors. |
| PDA Backlight Control | Portable Datalogger Sensor Bias |
Use Scenario: Generating negative bias for electroluminescent (EL) backlight drivers in PDAs and early smartphones. IC Role / Device Role / Timing Role: High-efficiency inverter supplying –100V-equivalent AC waveform (via external transformer) from low-voltage DC. Use Value: >95% conversion efficiency minimizes thermal stress on adjacent analog circuits; 35kHz switching avoids audible noise in user-facing devices. | Use Scenario: Biasing precision op-amps or analog front-end sensors requiring dual-rail operation in field-deployed dataloggers. IC Role / Device Role / Timing Role: Auxiliary negative rail generator for rail-to-rail input/output amplifiers powered from single 3.3V supply. Use Value: Enables true bipolar signal conditioning without oversized external DC/DC modules; SOT-23A footprint matches MCU and ADC packaging density. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1219ECHTR | 12 kHz oscillator, 60 µA supply current, higher output resistance (~42Ω at 3.3µF C1) | Better suited for ultra-low-noise, low-ripple applications where lower fOSC eases EMI filtering | Select when lower switching frequency is preferred for reduced radiated emissions or when driving lighter loads (<10mA) |
| MAX680ESA+ | External resistor-programmable fOSC (10–100 kHz), ±5V dual-output capability, higher max output current (100mA) | Supports dual-rail generation (±VIN) and heavier loads; requires additional resistor and two extra capacitors | Choose when dual-polarity outputs or >25mA capability is required; not drop-in due to different pinout and component count |
Compared with TC1219ECHTR, the TC1220ECHTR offers faster transient response and lower output impedance at medium loads but slightly higher quiescent current; versus MAX680ESA+, it trades programmability and dual output for minimal BOM count and guaranteed pin compatibility within the TC12xx family.
Availability
TC1220ECHTR is available at Aetrix Electronics and suitable for LCD panel bias, cellular phone display modules, and portable datalogger sensor biasing requiring stable component supply across high-mix, low-volume production runs.
Supply support for TC1220ECHTR 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 QS-9000 and ISO 9001 quality certifications.
The TC12xx series was designed specifically for compact, low-power voltage inversion in portable consumer electronics-emphasizing minimal external components, logic-level shutdown, and robust operation across –40°C to +85°C.
FAQ
What is the maximum output current specification for the TC1220ECHTR?
The TC1220ECHTR is rated for up to 25 mA output current under typical conditions (VIN = +5V, TA = +25°C, C1 = C2 = 3.3µF). At this load, output voltage droop follows VDROP = IOUT × ROUT, where ROUT is ~25Ω. Exceeding 25 mA may cause excessive droop or thermal stress; absolute maximum rating is 50 mA, but sustained operation above 25 mA is not recommended per datasheet guidance for TC1220ECHTR.
Does the TC1220ECHTR provide regulated output voltage?
No, the TC1220ECHTR does not regulate output voltage. It performs unregulated voltage inversion: VOUT ≈ –VIN at light loads, but droops linearly with output current (VOUT = –(VIN – IOUT × ROUT)). Designers must select external capacitors and define load limits to ensure acceptable VOUT stability for their specific application using TC1220ECHTR.
What are the recommended capacitor values for the TC1220ECHTR in standard inverter configuration?
Per the TC1220ECHTR datasheet, the standard inverter configuration uses C1 = C2 = 3.3 µF (low-ESR ceramic or tantalum). Larger C1 values reduce output resistance (e.g., 10 µF lowers ROUT to ~19.4Ω), while larger C2 values reduce output ripple (e.g., 10 µF cuts VRIPPLE to ~16 mVpp at 10 mA). C3 (input bypass) is optional but recommended for noisy supplies.
Can the TC1220ECHTR be used to generate a positive doubled output instead of negative inversion?
Yes-the TC1220ECHTR can be configured as a voltage doubler using an external diode network (e.g., two 1N4148 diodes plus C3/C4), as shown in Figure 4-6 of the TC1220ECHTR datasheet. However, this configuration shares switching resources with the inverter path, so combined output current from both rails must not exceed 40 mA total, and regulation is still absent for either output.
Is the TC1220ECHTR pin-compatible with the TC1219ECHTR?
Yes, the TC1220ECHTR is fully pin-compatible with the TC1219ECHTR-both use identical 6-pin SOT-23A packages and identical pin functions (OUT, VIN, C–, GND, SHDN, C+). The only differences are internal: oscillator frequency (35 kHz vs. 12 kHz), supply current (115 µA vs. 60 µA), and output resistance. This allows direct substitution where higher switching frequency or lower ROUT is beneficial, without PCB changes for TC1220ECHTR.
TC1220ECHTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- SOT-23-6
- 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):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin, 2Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 35kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TC1220ECHTR FAQ
1.How can I place an order for TC1220ECHTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1220ECHTR 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 TC1220ECHTR reliable?
The price and inventory of TC1220ECHTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1220ECHTR is usually 5 days.
3.What payment methods are accepted for TC1220ECHTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1220ECHTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1220ECHTR?
TC1220ECHTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1220ECHTR 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 TC1220ECHTR?
For technical support, including TC1220ECHTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1220ECHTR requirements.
6.How does Aetrix verify that TC1220ECHTR is sourced from the original manufacturer or authorized distributors?
All TC1220ECHTR 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 TC1220ECHTR meets industry standards.
7.What is the process for return or replacement of TC1220ECHTR?
All TC1220ECHTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1220ECHTR, 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 TC1220ECHTR part is unused and in its original packaging.
Return procedure for TC1220ECHTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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