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Microchip Technology TC1121EOA
- Part No.:
- TC1121EOA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC1121EOA.pdf
- Description:
- IC REG CHARGE PUMP 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,034
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Product details
Overview
TC1121EOA 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 without inductors. It features selectable oscillator frequency (10 kHz to 200 kHz), 50 µA quiescent current (FC open), and shutdown control. It serves as a compact, low-EMI negative rail generator in space-constrained embedded systems.
For engineers reviewing the TC1121EOA datasheet, TC1121EOA pinout, TC1121EOA application, or TC1121EOA equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, 8-pin SOIC package, 12 Ω typical output source resistance, and dual-mode oscillator control via FC/OSC pins for capacitor size optimization.
Technical Context
The TC1121EOA implements a switched-capacitor inverter topology with an internal RC oscillator whose frequency is set by the FC pin state (10 kHz typ. when open, 200 kHz typ. when tied to V+) or externally overdriven via OSC. Its switch matrix operates at half the oscillator frequency, directly determining ripple magnitude and effective output resistance.
Output regulation is passive: VOUT drops linearly with load due to 12 Ω typical ROUT and capacitor ESR contributions. Ripple is calculated as VRIPPLE = IOUT/(2 × fPUMP × C2) + IOUT × ESR_C2, where fPUMP = fOSC/2 - making capacitor selection and oscillator mode critical for noise-sensitive analog or mixed-signal rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-power analog circuitry like op-amp rails or ADC reference stages. |
| Oscillator Frequency | 10 kHz to 200 kHz - enables trade-off between low quiescent current (10 kHz) and smaller external capacitors (200 kHz). |
| Input Voltage Range | 2.4V to 5.5V - compatible with single Li-ion, 3.3V, or 5V system rails without pre-regulation. |
| Quiescent Current | 50 µA (FC open) - minimizes standby power in battery-operated instrumentation. |
| Shutdown Current | <1 µA - ensures near-zero power draw during system sleep modes. |
| Output Source Resistance | 12 Ω typ. - defines load-dependent voltage drop: e.g., −5.0V → −3.8V at 100 mA load. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive under-hood auxiliary applications. |
Pinout & Package
TC1121EOA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm pitch, 5.00 mm × 3.99 mm body dimensions, and exposed pad not present. Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Frequency Control Input | Logic-level input selecting oscillator frequency: open = 10 kHz, V+ = 200 kHz; no effect when OSC is externally driven. |
| 2 (CAP+) | Charge Pump Capacitor Positive Terminal | Switched node connecting to positive terminal of flying capacitor C1; carries high-frequency pulsed current. |
| 3 (GND) | Power Ground Reference | Primary return path for internal switches and external capacitors; must be low-impedance for stable operation. |
| 4 (CAP−) | Charge Pump Capacitor Negative Terminal | Switched node connecting to negative terminal of flying capacitor C1; phase-inverted relative to CAP+. |
| 5 (VOUT) | Negative Output Terminal | Delivers inverted voltage rail (e.g., −5V from +5V); output impedance dominates load regulation behavior. |
| 6 (SHDN) | Active-High Shutdown Input | Drives internal logic low to disable oscillator and switches; draws <1 µA when asserted. |
| 7 (OSC) | Oscillator Control/External Clock Input | Accepts external CMOS clock or external capacitor to ground for sub-10 kHz operation; overrides FC when driven. |
| 8 (V+) | Positive Supply Input | Primary power input (2.4V–5.5V); supplies all internal circuitry and charge pump energy transfer. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor architecture | Eliminates magnetic components, reducing BOM cost, board area, and EMI emissions in sensitive analog subsystems. |
| Selectably scalable oscillator | 10 kHz/200 kHz dual-mode operation allows optimization of capacitor size (e.g., 10 µF vs. 1 µF) versus quiescent current. |
| Low shutdown current | <1 µA shutdown draw enables long-term battery retention in portable medical or data logging devices. |
| Industrial temperature grade | −40°C to +85°C operating range supports deployment in harsh environments without derating. |
| Single-supply negative generation | Generates clean negative rail from a single positive supply - ideal for op-amp biasing, sensor excitation, or RS-232 level shifting. |
Applications
| Portable Medical Instrumentation | Laptop Peripheral Power |
|---|---|
|
Use Scenario: Powering precision analog front-ends in handheld ECG or glucose monitors requiring ±5V rails from a single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Negative voltage generator providing stable −3.7V rail with <90 mV ripple at 100 mA, synchronized to internal 10 kHz oscillator. Use Value: Enables rail-to-rail op-amps and low-noise ADCs without inductors - critical for compact, low-EMI medical enclosures. |
Use Scenario: Generating −5V for USB-C PD controller auxiliary bias or display interface level-shifting in ultrabooks. IC Role / Device Role / Timing Role: Compact inverter supplying −5V from 5V system rail; FC pin tied to V+ for 200 kHz operation and 2.2 µF ceramic capacitors. Use Value: Reduces solution footprint by >40% vs. inductor-based inverters while maintaining PSRR >50 dB up to 1 MHz. |
| Disk Drive Servo Control | μP-Based Industrial Controllers |
|
Use Scenario: Providing negative bias for voice coil motor (VCM) drivers and preamplifier stages in 2.5-inch HDDs. IC Role / Device Role / Timing Role: High-current inverter delivering −4.5V at 80 mA with 12 Ω ROUT; OSC pin left open for 10 kHz base frequency. Use Value: Delivers consistent voltage under dynamic load transients without inductor saturation risk or audible coil whine. |
Use Scenario: Generating −12V for RS-485 transceiver bias and op-amp rails in programmable logic controllers (PLCs) operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade inverter (TC1121EOA) operating from 5V rail with SHDN controlled by microcontroller GPIO. Use Value: Ensures reliable negative rail startup and shutdown sequencing in DIN-rail mounted automation hardware with −40°C cold-start capability. |
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; ±5V output from +5V input. | Lacks frequency selectability - requires larger capacitors than TC1121EOA at 200 kHz mode. | Choose when design prioritizes simplicity over capacitor size optimization. |
| LT1026CS8#PBF | Higher 125 mA output; fixed 25 kHz oscillator; wider 2.7V–16.5V input; SOIC-8 package. | Supports higher input voltages but consumes 120 µA quiescent current - less suitable for ultra-low-power battery use. | Choose when input exceeds 5.5V or higher output current margin is required. |
Compared with MAX680ESA+ and LT1026CS8#PBF, the TC1121EOA uniquely balances ultra-low 50 µA quiescent current, factory-trimmed 10/200 kHz dual-mode oscillator, and industrial temperature rating - making it optimal for space- and power-constrained industrial instrumentation where capacitor miniaturization and cold-start reliability are critical.
Availability
TC1121EOA is available at Aetrix Electronics and suitable for portable medical instrumentation, laptop peripheral power, disk drive servo control, and μP-based industrial controllers requiring stable component supply across extended temperature ranges.
Supply support for TC1121EOA 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 TC1121EOA belongs to Microchip's legacy charge pump converter product line, designed specifically for compact, inductorless negative voltage generation in industrial and portable electronics where EMI, size, and power efficiency are primary constraints.
FAQ
What is the maximum output current specification for TC1121EOA?
The TC1121EOA delivers up to 100 mA of continuous output current into a resistive load, with guaranteed performance down to −3.75V output under load. At 60 mA, the device maintains tighter regulation, and output voltage droop scales linearly with load due to its 12 Ω typical output source resistance. This makes TC1121EOA suitable for driving moderate-current analog circuitry such as op-amp stages or sensor signal conditioning blocks.
How does the FC pin affect TC1121EOA oscillator frequency and capacitor selection?
The FC pin on TC1121EOA selects between two internal oscillator frequencies: open-circuit yields ~10 kHz (minimizing quiescent current to 50 µA), while connection to V+ raises frequency to ~200 kHz. Higher frequency reduces required capacitor values - e.g., 10 µF ceramics suffice at 200 kHz versus 100 µF tantalums at 10 kHz - enabling smaller, lower-ESR solutions with reduced ripple. The FC pin has no effect if OSC is externally driven.
Can TC1121EOA operate with input voltages below 2.4V?
No - the absolute minimum specified input voltage for TC1121EOA is 2.4V. Operation below this threshold risks failure to initiate or sustain oscillation, resulting in no output voltage or unstable regulation. The device is not characterized for sub-2.4V operation, and attempting to run TC1121EOA at 2.2V or lower may cause erratic switching, increased output ripple, or complete functional failure per Absolute Maximum Ratings.
What is the shutdown current consumption of TC1121EOA?
When the SHDN pin is driven low (≤0.4V), TC1121EOA enters shutdown mode with total supply current dropping to less than 1 µA - verified across the full −40°C to +85°C operating range. This ultra-low shutdown current enables multi-year battery life in always-on monitoring devices. The shutdown state disables both the oscillator and internal switching matrix, eliminating switching losses and residual conduction paths.
Is TC1121EOA pin-compatible with other variants in the TC1121 family?
Yes - TC1121EOA shares identical 8-pin SOIC pinout and electrical functionality with TC1121COA, TC1121CPA, and TC1121CUA. The only differences are temperature grade (E suffix = −40°C to +85°C) and packaging (SOIC). All share identical FC, SHDN, OSC, CAP+, CAP−, VOUT, GND, and V+ pin assignments and timing behavior, allowing direct substitution where industrial temperature range is required.
TC1121EOA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
TC1121EOA FAQ
1.How can I place an order for TC1121EOA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1121EOA 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 TC1121EOA reliable?
The price and inventory of TC1121EOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1121EOA is usually 5 days.
3.What payment methods are accepted for TC1121EOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1121EOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1121EOA?
TC1121EOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1121EOA 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 TC1121EOA?
For technical support, including TC1121EOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1121EOA requirements.
6.How does Aetrix verify that TC1121EOA is sourced from the original manufacturer or authorized distributors?
All TC1121EOA 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 TC1121EOA meets industry standards.
7.What is the process for return or replacement of TC1121EOA?
All TC1121EOA units undergo pre-shipment inspection (PSI). If there is an issue with TC1121EOA, 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 TC1121EOA part is unused and in its original packaging.
Return procedure for TC1121EOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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