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Microchip Technology TC1121COA
- Part No.:
- TC1121COA
- Manufacturer:
- Microchip Technology
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TC1121COA.pdf
- Description:
- IC REG CHARGE PUMP 100MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,502
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Product details
Overview
TC1121COA 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 laptop computers and µP-based controllers for generating local negative bias rails.
For engineers reviewing the TC1121COA datasheet, TC1121COA pinout, TC1121COA application, or TC1121COA equivalent, key selection criteria include output current capability (100 mA), oscillator frequency configurability (FC pin), shutdown current (<1 µA), and SOIC-8 package compatibility with space-constrained embedded power designs.
Technical Context
The TC1121COA implements a two-phase switched-capacitor inverter topology with internal oscillator and logic-controlled switch matrix. Its output voltage magnitude closely tracks input (e.g., +5V → –5V at light load), with output resistance of 12 Ω typical enabling stable operation up to 100 mA load.
Oscillator frequency is controlled via FC pin (10 kHz typ. when open; 200 kHz typ. when tied to V+) or externally driven OSC pin. Ripple frequency equals half the oscillator frequency, allowing ripple reduction by lowering fOSC or increasing capacitor values (C1, C2).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-load analog or logic biasing without external pass devices. |
| 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 quiescent current (low f) and small external capacitors (high f). |
| Quiescent Current | 50 µA typ. (FC open) - minimizes standby power in battery-operated systems. |
| Shutdown Current | <1 µA - ensures near-zero power draw during system sleep modes. |
| Output Resistance | 12 Ω typ. - defines voltage droop under load (e.g., –5V → –3.8V at 100 mA). |
| Package | 8-pin SOIC - industry-standard footprint with 1.27 mm pitch, suitable for automated assembly. |
Pinout & Package
TC1121COA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with standard 1.27 mm lead pitch and 5.00 mm × 3.99 mm body dimensions per Microchip DS20001358D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Frequency Control | Configures internal oscillator: open = 10 kHz, V+ = 200 kHz; no effect if OSC is externally driven. |
| 2 (CAP+) | Charge Pump Capacitor Positive Terminal | Connects to positive plate of flying capacitor (C1); switches between V+ and VOUT during pumping cycle. |
| 3 (GND) | Power Ground Reference | Primary return path for internal logic and switch matrix; must be low-impedance for stable operation. |
| 4 (CAP–) | Charge Pump Capacitor Negative Terminal | Connects to negative plate of flying capacitor (C1); forms charge transfer path with CAP+. |
| 5 (VOUT) | Negative Output Terminal | Delivers inverted output voltage; source impedance ~12 Ω limits regulation under heavy load. |
| 6 (SHDN) | Active-Low Shutdown Input | Pulls supply current below 1 µA when logic low; tie to V+ if unused to enable operation. |
| 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 | Primary power input (2.4V–5.5V); also serves as reference for SHDN and FC logic thresholds. |
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 switching frequency | 10–200 kHz range allows optimization of capacitor size vs. efficiency for specific layout constraints. |
| Sub-1 µA shutdown mode | Enables ultra-low-power system states without requiring external disconnect circuitry. |
| Single-supply negative generation | Derives regulated-negative rail directly from positive supply-no dual-input or auxiliary sources needed. |
| SOIC-8 thermal performance | 470 mW power dissipation rating at TA ≤ 70°C supports continuous 100 mA operation in ambient environments. |
Applications
| Laptop Computer Power Rails | Medical Instrument Bias Supplies |
|---|---|
|
Use Scenario: Generating –5V bias for op-amps and ADC reference circuits in portable diagnostic equipment. IC Role / Device Role / Timing Role: Charge pump inverter providing isolated negative rail from main 3.3V or 5V system supply. Use Value: Enables rail-to-rail analog signal conditioning without inductor-induced noise or layout complexity. |
Use Scenario: Supplying negative voltage for LCD contrast control and sensor front-end amplifiers in handheld ultrasound units. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current inverter supporting battery life extension during intermittent measurement cycles. Use Value: Delivers stable –3.3V output with <1 µA shutdown current, preserving battery capacity between active sessions. |
| Disk Drive Servo Electronics | µP-Based Controller I/O Level Shifting |
|
Use Scenario: Providing negative gate drive or bias for voice coil motor (VCM) drivers in 2.5-inch HDDs. IC Role / Device Role / Timing Role: High-current (100 mA) inverter supporting transient peak loads during head positioning. Use Value: Maintains >–4.5V output under 80 mA dynamic load, ensuring reliable VCM control without voltage sag. |
Use Scenario: Creating –5V for RS-232 transceiver interface on microcontroller evaluation boards. IC Role / Device Role / Timing Role: Compact SOIC-8 inverter replacing discrete charge pump solutions in space-limited MCU peripherals. Use Value: Reduces component count by 7 parts (vs. diode/capacitor network) while improving ripple performance and thermal stability. |
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 dual-output capable. | Requires dual-output configuration for same functionality; less flexible frequency tuning. | Preferred when fixed-frequency, dual-rail generation is required and SOIC-8 footprint is acceptable. |
| ICL7660SIPAZ | 100 mA output; no shutdown pin; 10 kHz fixed oscillator; higher quiescent current (120 µA). | Lacks active shutdown, limiting use in ultra-low-power sleep modes. | Selected for cost-sensitive, non-shutdown applications where SOIC-8 compatibility and legacy design reuse are priorities. |
Compared with MAX680ESA+ and ICL7660SIPAZ, the TC1121COA uniquely combines programmable oscillator frequency, sub-1 µA shutdown, and SOIC-8 packaging-enabling optimized capacitor sizing and battery runtime in portable instrumentation and computing platforms.
Availability
TC1121COA is available at Aetrix Electronics and suitable for laptop computers, medical instruments, and disk drives requiring stable component supply with industrial temperature margin and long-term sourcing continuity.
Supply support for TC1121COA 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 manufacturer specializing in microcontrollers, analog devices, and power management ICs, with ISO/TS 16949-certified global operations.
The TC1121COA belongs to Microchip's legacy charge pump converter product line, designed specifically for compact, inductorless negative voltage generation in portable and embedded systems with strict size and EMI constraints.
FAQ
What is the maximum output current specification for the TC1121COA?
The TC1121COA delivers up to 100 mA of continuous output current into a resistive load, with output voltage dropping from ideal inversion (e.g., –5V from +5V) to approximately –3.8V at full 100 mA load due to its 12 Ω typical output resistance. This rating is validated across the 0°C to +70°C operating temperature range specified for the C-suffix device.
How does the FC pin affect oscillator frequency in the TC1121COA?
The FC (Frequency Control) pin on the TC1121COA sets the internal oscillator frequency: when left open, it operates at 10 kHz typical; when tied to V+, it increases to 200 kHz typical. This adjustment enables designers to reduce external capacitor sizes (C1, C2) at higher frequencies or lower quiescent current at lower frequencies-without changing the TC1121COA's core functionality or pinout.
Can the TC1121COA be used with an external clock source?
Yes, the TC1121COA supports external clocking via the OSC pin. A CMOS-compatible square wave (swinging within 100 mV of V+ and GND) can overdrive the internal oscillator, bypassing the FC pin's influence. When externally clocked, the TC1121COA maintains full functionality-including shutdown and output regulation-but oscillator frequency is determined solely by the external signal applied to the OSC pin.
What is the shutdown current consumption of the TC1121COA?
The TC1121COA draws less than 1 µA of supply current when the SHDN pin is driven low, regardless of whether the internal oscillator or an external clock is used. This ultra-low shutdown current is confirmed in the Electrical Characteristics table of the official datasheet (DS20001358D, page 3) and applies across the full 0°C to +70°C operating temperature range of the TC1121COA.
Is the TC1121COA pin-compatible with other variants like TC1121EOA or TC1121CUA?
Yes, the TC1121COA shares identical pinout and electrical functionality with TC1121EOA (extended-temp SOIC) and TC1121CUA (MSOP), differing only in operating temperature range (0°C to +70°C vs. –40°C to +85°C) and package type. All three variants use the same 8-pin functional mapping-ensuring direct PCB-level substitution where thermal and mechanical constraints permit.
TC1121COA 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TC1121COA FAQ
1.How can I place an order for TC1121COA through Aetrix?
Please submit a Request for Quotation (RFQ) for TC1121COA 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 TC1121COA reliable?
The price and inventory of TC1121COA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC1121COA is usually 5 days.
3.What payment methods are accepted for TC1121COA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC1121COA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC1121COA?
TC1121COA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC1121COA 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 TC1121COA?
For technical support, including TC1121COA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC1121COA requirements.
6.How does Aetrix verify that TC1121COA is sourced from the original manufacturer or authorized distributors?
All TC1121COA 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 TC1121COA meets industry standards.
7.What is the process for return or replacement of TC1121COA?
All TC1121COA units undergo pre-shipment inspection (PSI). If there is an issue with TC1121COA, 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 TC1121COA part is unused and in its original packaging.
Return procedure for TC1121COA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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