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Microchip Technology TC1121CUA
- Part No.:
- TC1121CUA
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1121CUA.pdf
- Description:
- IC REG CHARGE PUMP 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,094
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Product details
Overview
TC1121CUA from Microchip Technology is a 100 mA charge pump voltage inverter IC that converts 2.4V–5.5V positive input to a corresponding negative output without inductors. It features selectable oscillator frequency (10 kHz to 200 kHz), 50 µA quiescent current (FC open), and shutdown control. It is used in portable medical instruments requiring compact, low-EMI dual-rail supplies.
For engineers reviewing the TC1121CUA datasheet, TC1121CUA pinout, TC1121CUA application, or TC1121CUA equivalent, key selection criteria include output source resistance (12 Ω typ), temperature range (0°C to +70°C), MSOP-8 package constraints, and capacitor-driven ripple performance at varying pump frequencies.
Technical Context
The TC1121CUA implements a two-phase switched-capacitor inverter topology with internal oscillator control via FC and OSC pins. Its charge-transfer matrix operates at half the oscillator frequency, delivering unregulated negative output with load-dependent droop governed by ROUT and capacitor ESR.
Oscillator frequency is configurable: 10 kHz (FC open), 200 kHz (FC = V+), or externally driven via OSC pin. Shutdown reduces supply current to ≤1 µA, and external timing capacitors on OSC allow sub-10 kHz operation for ultra-low quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-power analog rails or op-amp biasing without thermal derating in MSOP-8. |
| Oscillator Frequency | 10 kHz to 200 kHz - enables trade-off between capacitor size (smaller at 200 kHz) and quiescent current (lower at 10 kHz). |
| Supply Current (Active) | 50 µA typ (FC open) - allows battery-powered operation for >1 year in low-duty-cycle instrumentation. |
| Shutdown Current | <1 µA - ensures negligible drain during system sleep modes. |
| Output Source Resistance | 12 Ω typ - defines voltage drop under load: e.g., −3.8 V output at 100 mA from 5 V input. |
| Input Voltage Range | 2.4 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V logic rails, and USB-powered systems. |
| Operating Temperature | 0°C to +70°C - rated for commercial-grade embedded applications including portable diagnostics. |
Pinout & Package
TC1121CUA is housed in an 8-pin MSOP package (3.0 mm × 3.0 mm × 1.1 mm body, 0.65 mm pitch), optimized for high-density PCB layouts and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Frequency control input | Connect to V+ for 200 kHz operation (enables smaller C1/C2); open for 10 kHz base frequency. |
| 2 (CAP+) | Charge-pump capacitor positive terminal | Switched node driving C1's positive plate; carries peak currents >100 mA during pumping phase. |
| 3 (GND) | Power-supply ground reference | Common return for V+, SHDN, and OSC; must be low-impedance to minimize noise coupling into CAP+/CAP−. |
| 4 (CAP−) | Charge-pump capacitor negative terminal | Switched node driving C1's negative plate; forms flying capacitor path with CAP+. |
| 5 (VOUT) | Negative output terminal | Delivers inverted voltage referenced to GND; output impedance dominated by ROUT and C2 ESR. |
| 6 (SHDN) | Active-low shutdown control | Pull low to disable oscillator and reduce supply current to <1 µA; tie to V+ if unused. |
| 7 (OSC) | Oscillator control/external clock input | Accepts external CMOS clock or external timing capacitor to GND for frequency tuning below 10 kHz. |
| 8 (V+) | Positive supply input | Primary power rail (2.4–5.5 V); powers internal logic, switches, and oscillator; must be bypassed near pin. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing EMI, board area, and BOM cost versus inductive DC/DC inverters. |
| Selectably scalable ripple | Adjustable oscillator frequency (10–200 kHz) directly controls output ripple frequency and magnitude via C1/C2 sizing. |
| Low-quiescent-current shutdown | Sub-1 µA shutdown current enables integration into always-on monitoring subsystems without battery drain. |
| Capacitor-only design | Requires only two external capacitors (C1 flying, C2 reservoir); no diodes, inductors, or precision resistors needed. |
| Wide input voltage range | 2.4 V–5.5 V operation supports direct connection to Li-ion cells, 3.3 V logic, and USB 5 V rails without pre-regulation. |
Applications
| Portable Medical Sensors | Laptop Display Bias Supplies |
|---|---|
Use Scenario: Powering dual-rail op-amps in handheld ECG front-ends where space and EMI are critical. IC Role / Device Role / Timing Role: Generates stable −5 V rail from 3.3 V main supply to enable rail-to-rail analog signal conditioning. Use Value: Eliminates inductor-induced noise in sensitive biopotential measurements while fitting within tight enclosure height limits. |
Use Scenario: Providing negative gate bias for TFT-LCD source drivers in ultrathin notebooks. IC Role / Device Role / Timing Role: Inverts 5 V system rail to −10 V using cascaded TC1121CUA units for higher voltage magnitude. Use Value: Achieves required bias voltage with <1.5 mm profile and no magnetic field interference with display data lines. |
| Disk Drive Read/Write Channel | μP-Based Industrial Controllers |
Use Scenario: Supplying negative voltage for HDD preamplifier ICs in 2.5-inch drives. IC Role / Device Role / Timing Role: Delivers −3.3 V at 60 mA with <50 mV ripple using 100 kHz oscillator mode and 10 µF ceramic caps. Use Value: Meets tight ripple spec without inductor placement constraints near high-speed SATA interfaces. |
Use Scenario: Generating isolated analog supply for ADC reference buffers in PLC I/O modules. IC Role / Device Role / Timing Role: Provides clean −2.5 V reference rail from 5 V backplane, synchronized to system clock via OSC pin. Use Value: Enables precise 16-bit ADC performance by eliminating switching noise coupling through shared ground paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar charge pump inverter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX680ESA+ | Fixed 10 kHz oscillator; no FC pin; 100 mA output; SO8 only; higher quiescent current (120 µA). | Lacks frequency scaling - requires larger capacitors for same ripple; not suitable for ultra-low-power sleep modes. | Prefer when board layout already uses SO8 footprint and oscillator flexibility is unnecessary. |
| LM2776IDR | Integrated LDO post-regulator; 250 mA output; 1.2 MHz fixed frequency; 10-pin WSON; ±1.5% output accuracy. | Provides regulated output and lower noise but consumes more quiescent current (120 µA active) and requires three external caps. | Choose when output voltage stability under load variation is prioritized over size and EMI. |
Compared with MAX680ESA+ and LM2776IDR, the TC1121CUA offers unique trade-offs: lowest active current (50 µA), MSOP-8 footprint for space-constrained designs, and user-selectable frequency for optimizing capacitor size versus efficiency-making it optimal for portable instrumentation where size, battery life, and EMI co-design are critical.
Availability
TC1121CUA is available at Aetrix Electronics and suitable for portable medical sensors, laptop display bias supplies, and μP-based industrial controllers requiring stable component supply across extended production cycles.
Supply support for TC1121CUA 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 is a U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS 16949-certified manufacturing.
The TC1121CUA belongs to Microchip's legacy charge pump converter family, designed specifically for compact, inductor-free negative voltage generation in space- and noise-sensitive portable electronics.
FAQ
What is the maximum output current capability of the TC1121CUA?
The TC1121CUA delivers up to 100 mA of continuous output current into a negative rail. At full load (100 mA), the typical output voltage drops to −3.8 V when supplied from +5 V due to its 12 Ω output source resistance. This rating is valid across the full operating temperature range (0°C to +70°C) and assumes proper capacitor selection and PCB layout per the datasheet guidelines.
Can the TC1121CUA operate with an external clock signal?
Yes, the TC1121CUA supports external clocking via the OSC pin (pin 7). A CMOS-compatible square wave within 100 mV of V+ and GND can overdrive the internal oscillator, enabling precise synchronization with system timing or noise-sensitive frequency domains. When OSC is externally driven, the FC pin has no effect on frequency, and quiescent current remains at typical levels for the selected clock rate.
What package type is used for the TC1121CUA?
The TC1121CUA is packaged in an 8-pin MSOP (Mini Small Outline Package) with 0.65 mm lead pitch, 3.0 mm × 3.0 mm body dimensions, and 1.1 mm maximum height. This package is RoHS-compliant, tape-and-reel compatible (2500 units per reel), and optimized for high-density automated assembly in portable electronics.
How does the FC pin affect TC1121CUA performance?
The FC (Frequency Control) pin on the TC1121CUA selects oscillator frequency: left open → 10 kHz (lowest quiescent current); tied to V+ → 200 kHz (enables use of smaller 1–10 µF ceramic capacitors). This adjustment directly impacts output ripple magnitude, capacitor size, and EMI profile-without altering regulation or output voltage accuracy, since the device is unregulated.
Is the TC1121CUA still in active production?
The TC1121CUA is marked as "Obsolete Device" in its official Microchip datasheet (DS20001358D, 2014), indicating end-of-life status by the manufacturer. However, Aetrix Electronics maintains verified legacy inventory with full traceability and supports ongoing production programs requiring this specific variant for form-fit-function continuity in existing designs.
TC1121CUA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Ratiometric
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -Vin
- Voltage - Output (Max):
- -
- Current - Output:
- 100mA
- Frequency - Switching:
- 10kHz ~ 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
TC1121CUA FAQ
1.How can I place an order for TC1121CUA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1121CUA 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 TC1121CUA reliable?
The price and inventory of TC1121CUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1121CUA is usually 5 days.
3.What payment methods are accepted for TC1121CUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1121CUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1121CUA?
TC1121CUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1121CUA 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 TC1121CUA?
For technical support, including TC1121CUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1121CUA requirements.
6.How does Aetrix verify that TC1121CUA is sourced from the original manufacturer or authorized distributors?
All TC1121CUA 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 TC1121CUA meets industry standards.
7.What is the process for return or replacement of TC1121CUA?
All TC1121CUA units undergo pre-shipment inspection (PSI). If there is an issue with TC1121CUA, 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 TC1121CUA part is unused and in its original packaging.
Return procedure for TC1121CUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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