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Microchip Technology TC1121EUA
- Part No.:
- TC1121EUA
- Manufacturer:
- Microchip Technology
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
TC1121EUA.pdf
- Description:
- IC REG CHARGE PUMP 100MA 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,011
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Product details
Overview
TC1121EUA from Microchip Technology is a 100 mA charge pump voltage inverter IC that converts 2.4V–5.5V input to a corresponding negative output voltage, operates at selectable oscillator frequencies (10–200 kHz), uses only two external capacitors, and features shutdown control - deployed in medical instrumentation, laptop power rails, and µP-based controllers.
For engineers reviewing the TC1121EUA datasheet, TC1121EUA pinout, TC1121EUA application, or TC1121EUA equivalent, key selection criteria include its -40°C to +85°C extended temperature rating, 8-pin MSOP package, 50 µA quiescent current (FC open), 12 Ω typical output resistance, and compatibility with small ceramic capacitors via high-frequency mode.
Technical Context
The TC1121EUA implements a switched-capacitor inverter topology with an internal RC oscillator whose frequency is selectable via the FC pin (10 kHz typ. when open, 200 kHz typ. when tied to V+) or overdrivable by an external CMOS clock on the OSC pin. Its switch matrix delivers unregulated negative output with load-dependent voltage drop governed by ROUT ≈ 12 Ω.
Operation requires only two external capacitors (C1 on CAP+, C2 on CAP–); no inductors are needed. Shutdown reduces supply current to ≤1 µA, and output ripple scales inversely with oscillator frequency and capacitor value - e.g., 90 mV p-p at 100 mA with 150 µF C2 and 10 kHz pumping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-power analog or logic biasing requiring negative rail |
| Input Voltage Range | 2.4V to 5.5V - compatible with single-cell Li-ion, 3.3V, and 5V system rails |
| Oscillator Frequency | 10 kHz to 200 kHz - enables trade-off between low IQ (sub-10 kHz possible) and small capacitor size |
| Quiescent Current | 50 µA typ. (FC open) - enables battery-sensitive applications with minimal standby drain |
| Shutdown Current | <1 µA - ensures near-zero power draw during system sleep or reset states |
| Output Resistance | 12 Ω typ. - defines load regulation: ~1.2 V drop at 100 mA, limiting use to medium-precision loads |
| Operating Temp | -40°C to +85°C - qualified for industrial and automotive-adjacent environments |
Pinout & Package
TC1121EUA is housed in an 8-pin MSOP package (3.0 mm × 3.0 mm × 1.1 mm body, 0.65 mm pitch), optimized for space-constrained PCB layouts while maintaining thermal dissipation up to 333 mW at TA ≤ 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Frequency control input | Selects internal oscillator frequency: open = 10 kHz, V+ = 200 kHz; no effect when OSC is externally driven |
| 2 (CAP+) | Charge-pump capacitor positive terminal | Connects to positive plate of flying capacitor C1; carries bidirectional high-current switching pulses |
| 3 (GND) | Power-supply ground reference | Primary return path for all internal logic and switching currents; must be low-impedance |
| 4 (CAP–) | Charge-pump capacitor negative terminal | Connects to negative plate of reservoir capacitor C2; critical for output stability and ripple suppression |
| 5 (VOUT) | Negative output terminal | Delivers inverted voltage (e.g., -5V from +5V input); unregulated, load-dependent magnitude |
| 6 (SHDN) | Active-high shutdown control | Drives internal circuitry into ultra-low-power state when pulled low; VIH ≥ 0.8×V+, VIL ≤ 0.4V |
| 7 (OSC) | Oscillator control/external clock input | Accepts external CMOS clock or external timing capacitor to GND for sub-10 kHz operation |
| 8 (V+) | Positive supply input | Supplies all internal circuitry and switching energy; absolute max 6V; must be bypassed locally |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates EMI-prone magnetics and reduces BOM cost/footprint vs. inductive DC/DC inverters |
| Selectable 10–200 kHz oscillator | Enables optimization: low-frequency for lowest IQ, high-frequency for <10 µF ceramic capacitors |
| 100 mA output capability | Sufficient to power op-amp dual supplies, RS-232 transceivers, or sensor bias networks |
| Ultra-low shutdown current (<1 µA) | Preserves battery life in portable systems during deep-sleep modes without external disconnect |
| Extended temperature range (-40°C to +85°C) | Supports deployment in industrial control, medical diagnostics, and ruggedized computing |
Applications
| Laptop Power Management | Medical Instrumentation |
|---|---|
Use Scenario: Generating -5V rail for analog front-end op-amps and ADC reference buffers in portable diagnostic devices. IC Role / Device Role / Timing Role: Charge pump inverter providing isolated negative supply without magnetic components or layout-sensitive routing. Use Value: Enables compact, low-EMI power architecture meeting IEC 60601 leakage and noise requirements. | Use Scenario: Biasing precision current sources and photodiode transimpedance amplifiers in handheld blood analyzers. IC Role / Device Role / Timing Role: Unregulated negative voltage source delivering stable -3.3V to -5V under dynamic load steps up to 60 mA. Use Value: Maintains signal integrity via low-output-impedance delivery (12 Ω typ.) and <90 mV ripple at full load. |
| Disk Drive Servo Control | µP-Based Industrial Controllers |
Use Scenario: Supplying negative gate drive or analog comparator rails in 2.5" HDD voice coil motor driver circuits. IC Role / Device Role / Timing Role: Inverting converter operating from 3.3V main rail to generate -3.3V for level-shifting and biasing. Use Value: Supports fast transient response due to capacitor-only energy storage and 200 kHz high-frequency mode. | Use Scenario: Providing negative supply for RS-485 transceivers and isolated CAN interface ICs in PLC I/O modules. IC Role / Device Role / Timing Role: Compact, shutdown-controllable inverter enabling power sequencing and fault isolation. Use Value: Allows firmware-controlled rail disable (via SHDN) to reduce system-level standby power by >99%. |
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; ±5V output from 5V input | Lacks frequency selectability and MSOP option; higher IQ (120 µA); no shutdown | Choose when fixed-frequency, no-shutdown operation suffices and SOIC footprint is acceptable |
| LM2776IDR | 125 mA output; integrated LDO post-regulator; 1.2 MHz switching; 10 µF caps; WSON-12 package | Provides regulated output and lower ripple but requires more complex layout and lacks MSOP fit | Choose when regulated -5V is mandatory and board area allows WSON-12 with additional decoupling |
Compared with MAX680ESA+ and LM2776IDR, the TC1121EUA uniquely balances MSOP footprint, shutdown control, and user-selectable frequency - making it optimal for space-constrained, battery-aware designs where unregulated but predictable negative voltage suffices.
Availability
TC1121EUA is available at Aetrix Electronics and suitable for medical instrumentation, laptop computers, and disk drive servo control requiring stable component supply across extended temperature ranges and long-lifecycle production programs.
Supply support for TC1121EUA 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 and global technical support infrastructure.
The TC1121EUA belongs to Microchip's legacy charge pump converter product line, designed specifically for compact, inductorless negative voltage generation in portable and industrial systems where EMI, cost, and board space are critical constraints.
FAQ
What is the maximum input voltage rating for the TC1121EUA?
The TC1121EUA has an absolute maximum supply voltage (V+) of 6V. Operation beyond this risks permanent damage. The recommended operating range is 2.4V to 5.5V per the datasheet, ensuring reliable charge-pump inversion and thermal stability in the 8-pin MSOP package. Always observe derating guidelines when operating near limits.
Does the TC1121EUA provide regulated output voltage?
No, the TC1121EUA delivers an unregulated negative output - its VOUT magnitude depends on input voltage, load current, and output resistance (12 Ω typ.). For example, with 5V input and 100 mA load, VOUT drops to approximately -3.8V. Designers must account for this droop in system-level tolerance budgets or add external regulation if precision is required.
Can the TC1121EUA be used with ceramic capacitors?
Yes, the TC1121EUA is fully compatible with X5R/X7R ceramic capacitors. In high-frequency mode (FC = V+), 1–10 µF ceramics suffice for C1 and C2. Lower ESR improves ripple performance - e.g., 150 µF ceramic yields ~90 mV p-p ripple at 100 mA. Avoid high-ESR electrolytics unless low-frequency operation is acceptable.
How does the FC pin affect TC1121EUA performance?
The FC pin selects internal oscillator frequency: open = 10 kHz (50 µA IQ), V+ = 200 kHz (higher IQ but enables smaller capacitors). When OSC is driven externally, FC has no effect. This flexibility lets designers optimize for lowest quiescent current or smallest passive size - a key differentiator versus fixed-frequency alternatives like the MAX680ESA+.
Is the TC1121EUA still in active production?
The TC1121EUA is marked "Obsolete Device" in its official datasheet (DS20001358D), but Aetrix Electronics maintains verified inventory with full traceability and supports legacy design continuity. We confirm functional equivalence, packaging authenticity, and compliance with original Microchip specifications - enabling drop-in replacement for existing builds and repair programs.
TC1121EUA 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
TC1121EUA FAQ
1.How can I place an order for TC1121EUA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1121EUA 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 TC1121EUA reliable?
The price and inventory of TC1121EUA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1121EUA is usually 5 days.
3.What payment methods are accepted for TC1121EUA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1121EUA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1121EUA?
TC1121EUA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1121EUA 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 TC1121EUA?
For technical support, including TC1121EUA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1121EUA requirements.
6.How does Aetrix verify that TC1121EUA is sourced from the original manufacturer or authorized distributors?
All TC1121EUA 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 TC1121EUA meets industry standards.
7.What is the process for return or replacement of TC1121EUA?
All TC1121EUA units undergo pre-shipment inspection (PSI). If there is an issue with TC1121EUA, 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 TC1121EUA part is unused and in its original packaging.
Return procedure for TC1121EUA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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