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Microchip Technology TC1219ECHTR
- Part No.:
- TC1219ECHTR
- Manufacturer:
- Microchip Technology
- Package:
- SOT-23-6
- Datasheet:
-
TC1219ECHTR.pdf
- Description:
- IC REG CHARGE PUMP INV SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,904
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Product details
Overview
TC1219ECHTR 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 12kHz oscillator frequency. It provides unregulated negative output (VOUT ≈ –VIN) for biasing LCD panels in portable battery-powered systems.
For engineers reviewing the TC1219ECHTR datasheet, TC1219ECHTR pinout, TC1219ECHTR application, or TC1219ECHTR equivalent, key selection criteria include its fixed 12kHz switching frequency, shutdown supply current <1µA, 25Ω typical output resistance at +25°C/VIN=+5V, compatibility with low-ESR ceramic capacitors, and suitability for space-constrained inverter designs requiring minimal external components.
Technical Context
The TC1219ECHTR implements a two-phase switched-capacitor topology using integrated power MOSFETs and an on-chip oscillator to invert VIN without inductors. Its internal control logic enables operation only when SHDN is high, entering sub-1µA shutdown mode when SHDN is pulled low.
It requires exactly two external commutation capacitors (C+ and C–), supports no regulation or feedback, and exhibits linear output droop (VDROP = IOUT × ROUT) due to fixed 25Ω nominal output resistance - making it appropriate for light-to-moderate load applications where precise voltage regulation is not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 12 kHz - determines switching period, capacitor sizing, and ripple magnitude; lower than TC1220's 35 kHz for reduced EMI in noise-sensitive systems |
| Input Voltage Range | +2.5V to +5.5V - supports single-cell Li-ion, dual-cell alkaline/NiMH, and 3.3V/5V logic rails |
| Output Current | Up to 25 mA - sufficient for segment LCD bias, small OLED displays, and analog front-end negative rails |
| Voltage Conversion Efficiency | >95% typical - minimizes power loss and thermal rise in compact battery-powered enclosures |
| Shutdown Supply Current | <1 µA - enables ultra-low-power standby in always-on portable devices |
| Output Resistance | 25 Ω nominal at +25°C/VIN=+5V - defines linear VOUT droop under load (VDROP = IOUT × 25Ω) |
| Operating Temperature | –40°C to +85°C - qualified for industrial and consumer portable equipment environments |
Pinout & Package
TC1219ECHTR is housed in a 6-pin SOT-23A (EIAJ SC-74) surface-mount package measuring 3.00 mm × 1.75 mm × 1.30 mm, with standard tape-and-reel packaging (3000 units per 7-inch reel).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Inverting charge pump output | Delivers negative voltage (≈ –VIN); connects to load; output impedance dominates load regulation |
| 2 - VIN | Positive power supply input | Accepts +2.5V to +5.5V; must be bypassed with low-ESR capacitor near pin |
| 3 - C– | Commutation capacitor negative terminal | Connects to negative side of flying capacitor (C1); critical for charge transfer phase timing |
| 4 - GND | Ground reference | System ground return; must be low-impedance and thermally coupled to PCB ground plane |
| 5 - SHDN | Active-low shutdown control | Pull low to disable device and reduce supply current to <1 µA; must not float |
| 6 - C+ | Commutation capacitor positive terminal | Connects to positive side of flying capacitor (C1); completes charge-transfer loop with C– |
Key Features
| Feature | Design Value |
|---|---|
| Voltage inversion only | Fixed –1× gain architecture (VOUT ≈ –VIN) - eliminates need for external feedback or regulation circuitry |
| Ultra-small footprint | 6-pin SOT-23A package - saves board area in space-constrained handhelds and wearables |
| Minimal external parts | Only two ceramic capacitors required - reduces BOM count, assembly cost, and layout complexity |
| Low-noise switching | 12 kHz oscillator frequency - avoids audible noise and simplifies EMI filtering vs. higher-frequency alternatives |
| Logic-compatible shutdown | SHDN accepts 0V–VIN logic levels - interfaces directly with 1.8V/3.3V/5V microcontrollers without level-shifting |
Applications
| Segment LCD Bias | Portable Medical Dataloggers |
|---|---|
Use Scenario: Generating negative bias voltage for contrast control in monochrome STN/TN LCD modules used in handheld test meters and diagnostic tools. IC Role / Device Role / Timing Role: Charge-pump inverter providing unregulated –3V to –5V rail from a single 3.3V or 5V supply. Use Value: Eliminates need for discrete inductor-based DC/DC converters, reducing size, cost, and EMI in Class II medical portable devices. | Use Scenario: Powering analog front-end op-amps and ADC reference circuits requiring dual-rail supplies in battery-operated environmental sensors. IC Role / Device Role / Timing Role: Negative rail generator enabling true bipolar signal conditioning without split supplies. Use Value: Enables rail-to-rail input range and improved SNR in low-power data acquisition systems running on coin cells or Li-ion batteries. |
| Cellular Phone Keypad Backlight | Handheld Barcode Scanners |
Use Scenario: Supplying negative voltage for electroluminescent (EL) backlight drivers in legacy GSM handset keypads. IC Role / Device Role / Timing Role: Low-current inverter powering EL panel driver ICs during brief illumination bursts. Use Value: Delivers consistent brightness across varying battery voltage (3.0V–4.2V) with minimal quiescent current draw between activations. | Use Scenario: Providing negative bias for CCD image sensor bias networks in compact industrial barcode readers. IC Role / Device Role / Timing Role: Stable –5V source for CCD substrate bias, isolated from noisy digital supply domains. Use Value: Reduces dark current and improves image uniformity by maintaining stable sensor bias independent of main system load transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge-pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TC1220ECHTR | 35 kHz oscillator frequency, 115 µA typical supply current, 19.4 Ω output resistance at 10 µF C1 | Better ripple performance at same capacitance; higher switching losses limit efficiency at light loads | Select TC1220ECHTR when lower output ripple is prioritized over lowest quiescent current or EMI sensitivity |
| MAX680ESA+ | ±5V dual-output (inverter + doubler), 10 kHz oscillator, ±10 mA output, SO-8 package | Provides both inverted and doubled outputs simultaneously; larger footprint and higher minimum supply (±4.5V) | Choose MAX680ESA+ when dual-rail generation from one IC is required and board space allows SO-8 |
Compared with TC1219ECHTR, TC1220ECHTR offers lower output impedance and reduced ripple but trades off higher quiescent current and EMI; MAX680ESA+ delivers dual outputs in SO-8 but lacks shutdown control and requires higher minimum input voltage - making TC1219ECHTR optimal for ultra-compact, low-quiescent, single-inverter applications.
Availability
TC1219ECHTR is available at Aetrix Electronics and suitable for LCD panel bias, portable dataloggers, and cellular phone peripherals requiring stable component supply with long-term manufacturability and consistent parametric performance.
Supply support for TC1219ECHTR 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 TC1219ECHTR belongs to Microchip's legacy charge-pump converter family, designed specifically for low-power, space-constrained portable electronics needing simple, efficient voltage inversion without inductors or regulation.
FAQ
What is the maximum output current capability of the TC1219ECHTR?
The TC1219ECHTR delivers up to 25 mA of continuous output current under typical conditions (VIN = +5V, TA = +25°C, C1 = C2 = 10 µF). Output voltage droops linearly with load due to its 25 Ω nominal output resistance - for example, at 20 mA load, VOUT ≈ –4.5V. Absolute maximum output current is rated at 50 mA, but sustained operation above 25 mA may exceed thermal limits in the SOT-23A package.
Does the TC1219ECHTR provide regulated output voltage?
No, the TC1219ECHTR does not provide regulated output voltage. It is an unregulated switched-capacitor inverter: VOUT ≈ –VIN at no load, but droops linearly with output current (VDROP = IOUT × ROUT). At VIN = +5V and IOUT = 10 mA, VOUT ≈ –4.75V. Designers must account for this droop in system-level voltage margining and select output capacitors accordingly.
What are the recommended capacitor values for the TC1219ECHTR in a standard inverter configuration?
For standard inverter operation, Microchip recommends 10 µF low-ESR ceramic capacitors for both C1 (commutation) and C2 (reservoir), as validated in the datasheet's electrical characteristics (TA = 25°C, VIN = +5V). Using 3.3 µF capacitors increases output resistance and ripple; 30 µF reduces both but offers diminishing returns. All capacitors must be placed close to the TC1219ECHTR pins with short, wide traces.
Can the TC1219ECHTR be used in parallel to increase output current?
Yes, multiple TC1219ECHTR devices can be paralleled to reduce effective output resistance and increase total output current capacity. Each device requires its own C1 capacitor, but C2 may be shared - though its value should scale with the number of paralleled units to maintain ripple performance. Parallel operation requires matched layout and identical external components to ensure balanced current sharing.
Is the TC1219ECHTR pin-compatible with the TC1220ECHTR?
Yes, the TC1219ECHTR and TC1220ECHTR are pin-compatible and share identical 6-pin SOT-23A footprints, pin functions, and connection topologies. They differ only in oscillator frequency (12 kHz vs. 35 kHz), supply current (60 µA vs. 115 µA), and output resistance - allowing direct substitution where timing or efficiency requirements permit, without PCB changes.
TC1219ECHTR 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:
- 12kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
TC1219ECHTR FAQ
1.How can I place an order for TC1219ECHTR through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1219ECHTR 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 TC1219ECHTR reliable?
The price and inventory of TC1219ECHTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1219ECHTR is usually 5 days.
3.What payment methods are accepted for TC1219ECHTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1219ECHTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1219ECHTR?
TC1219ECHTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1219ECHTR 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 TC1219ECHTR?
For technical support, including TC1219ECHTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1219ECHTR requirements.
6.How does Aetrix verify that TC1219ECHTR is sourced from the original manufacturer or authorized distributors?
All TC1219ECHTR 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 TC1219ECHTR meets industry standards.
7.What is the process for return or replacement of TC1219ECHTR?
All TC1219ECHTR units undergo pre-shipment inspection (PSI). If there is an issue with TC1219ECHTR, 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 TC1219ECHTR part is unused and in its original packaging.
Return procedure for TC1219ECHTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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