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onsemi MC1121DMR2
- Part No.:
- MC1121DMR2
- Manufacturer:
- onsemi
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MC1121DMR2.pdf
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Product details
Overview
MC1121DMR2 from onsemi is a 100 mA charge pump voltage inverter IC that converts 2.4 V–5.5 V positive input to a corresponding negative output (e.g., +5.0 V → −5.0 V under light load), operates with selectable oscillator frequency (10 kHz or 200 kHz), features shutdown current <1.0 µA, and targets space-constrained portable power rails in medical instruments and µP-based controllers.
For engineers reviewing the MC1121DMR2 datasheet, pinout, applications, or equivalent options, key selection criteria include unregulated inverter topology, dual-capacitor operation (no inductor), Micro-8 package footprint, FC-pin frequency control, and SHDN logic-level compatibility with 2.4–5.5 V systems.
Technical Context
The MC1121DMR2 implements a switched-capacitor voltage inverter using a four-phase charge-pump switch matrix driven by an internal oscillator whose frequency is set via FC pin state (GND = 10 kHz typ, VDD = 200 kHz typ) or external clock injection at OSC pin. It lacks regulation-output voltage drops linearly with load due to ~12 Ω typical output resistance.
Oscillator frequency directly determines ripple frequency (fRIPPLE = fOSC/2) and allowable capacitor size: at 200 kHz, 10 µF capacitors suffice; at 10 kHz, ≥150 µF is required for <90 mV ripple at 100 mA. Shutdown disables all internal circuitry except input leakage paths, reducing supply current to ≤1.0 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 100 mA max - supports moderate-power analog or logic rails requiring negative bias |
| Input Voltage Range | 2.4 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V system supplies |
| Oscillator Frequency | 10 kHz (FC = GND) or 200 kHz (FC = VDD) - selects trade-off between quiescent current and capacitor size |
| Shutdown Current | <1.0 µA - enables ultra-low-power standby in battery-operated devices |
| Output Resistance | 12 Ω typ at 60 mA - defines load-dependent voltage droop (e.g., −3.8 V at 100 mA from +5 V input) |
| Operating Temp | −40°C to +85°C - qualified for industrial and portable medical equipment environments |
| Package | Micro-8 (SOIC-8 variant) - 3.1 mm × 4.8 mm footprint, surface-mount, tape-and-reel (2500/reel) |
Pinout & Package
MC1121DMR2 uses the Micro-8 plastic package (case TBD), 3.10 mm × 4.80 mm body, 1.10 mm max height, 0.65 mm pitch, with pin 1 marked at top-right corner per standard reel orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FC) | Oscillator frequency control | Open or GND → 10 kHz; VDD → 200 kHz; no effect when OSC driven externally |
| 2 (CAP+) | Charge-pump capacitor positive terminal | Connects to positive plate of flying capacitor C1; carries high-frequency switching current |
| 3 (GND) | Power ground reference | Common return for VDD, CAP−, SHDN, and load; must be low-impedance path |
| 4 (CAP−) | Charge-pump capacitor negative terminal | Connects to negative plate of flying capacitor C1; switches polarity during pumping cycle |
| 5 (VOUT) | Negative output voltage node | Delivers inverted voltage; output impedance ~12 Ω limits regulation and load step response |
| 6 (SHDN) | Active-high shutdown enable | VIH ≥ 0.8×VDD disables device; VIL ≤ 0.4 V enables operation; ties to VDD if unused |
| 7 (OSC) | Oscillator control/external clock input | Accepts external CMOS clock or external timing capacitor to GND for frequency reduction |
| 8 (VDD) | Positive supply input | 2.4–5.5 V input; powers internal logic, oscillator, and switch drivers; bypass with 0.1 µF |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor operation | Eliminates EMI-sensitive magnetics and reduces BOM cost and PCB area vs. inductive DC/DC inverters |
| Dual-capacitor topology | Requires only C1 (flying) and C2 (reservoir); simplifies layout and avoids complex filter design |
| Selectable 10 kHz / 200 kHz oscillator | Enables optimization: low-frequency for lowest IQ (50 µA), high-frequency for miniaturized 10 µF caps |
| Unregulated inverter architecture | Provides predictable −VIN output under light load; voltage droop scales linearly with ILOAD × ROUT |
| Sub-1 µA shutdown mode | Extends battery life in intermittent-use applications such as handheld diagnostics or sensor wake cycles |
Applications
| Laptop Display Bias Supply | Portable Medical Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Generating −5 V bias for LCD column drivers in compact clamshell laptops where board space and EMI are critical. IC Role / Device Role / Timing Role: Charge-pump inverter providing unregulated negative rail; OSC frequency selected at 200 kHz to fit 10 µF ceramic caps within hinge-area PCB real estate. Use Value: Eliminates inductor, cuts solution size by >40%, and avoids magnetic coupling into touch-screen digitizer signals. |
Use Scenario: Powering op-amp input stages in battery-powered ECG front-ends requiring clean ±2.5 V rails from a 3.3 V LDO. IC Role / Device Role / Timing Role: Negative voltage generator referenced to system GND; FC tied to GND for 10 kHz operation to minimize quiescent current during sleep mode. Use Value: Achieves <1.0 µA shutdown current while maintaining fast wake-up (<10 µs) and <90 mV ripple at 100 µA sensor bias load. |
| Disk Drive Servo Amplifier Supply | µP-Based Industrial Controller Auxiliary Rail |
|
Use Scenario: Delivering −3.3 V to servo motor driver op-amps in 2.5″ HDDs where thermal density and acoustic noise constrain inductor use. IC Role / Device Role / Timing Role: Unregulated inverter supplying negative rail; paralleled MC1121DMR2 units reduce effective ROUT to support 80 mA peak servo current. Use Value: Enables 12 Ω × 2 parallel configuration (6 Ω total), limiting voltage sag to <0.5 V at full load without thermal derating. |
Use Scenario: Providing −5 V for RS-232 transceiver bias in programmable logic controllers housed in metal enclosures with strict EMC limits. IC Role / Device Role / Timing Role: EMI-optimized inverter; C1/C2 placed adjacent to MC1121DMR2 pins to minimize loop area and radiated emissions. Use Value: Meets CISPR-22 Class B conducted emissions without ferrite beads or shielding, unlike inductive solutions. |
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; higher 120 mA output; requires 2 × 10 µF; 8-pin SOIC | Less flexible frequency tuning; better for fixed-cost, fixed-performance designs | Choose MAX680ESA+ when oscillator flexibility is unnecessary and higher output current margin is needed |
| TC7660COA713 | Fixed 10 kHz; 20 mA output; 8-pin SOIC; lower IQ (17 µA active); no shutdown pin | Not suitable for >20 mA loads; lacks SHDN control; limited to ultra-low-power micro-rails | Choose TC7660COA713 only for sub-20 mA, always-on auxiliary rails where shutdown is not required |
Compared with MC1121DMR2, MAX680ESA+ offers higher current but no frequency scaling, while TC7660COA713 provides lower IQ but cannot support 100 mA loads or controlled shutdown-making MC1121DMR2 the only option balancing programmable frequency, 100 mA capability, and sub-µA shutdown in Micro-8.
Availability
MC1121DMR2 is available at Aetrix Electronics and suitable for laptop computers, medical instruments, and disk drives requiring stable component supply, long-term obsolescence management, and RoHS-compliant Micro-8 packaging.
Supply support for MC1121DMR2 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering silicon solutions for automotive, industrial, cloud, and medical applications.
The MC1121DMR2 belongs to onsemi's legacy analog power management portfolio, designed specifically for compact, low-EMI negative voltage generation in portable and instrumentation systems where inductors are impractical.
FAQ
What is the maximum continuous output current specification for the MC1121DMR2?
The MC1121DMR2 is rated for 100 mA maximum continuous output current under specified conditions (VDD = 5.0 V, TA = 25°C, FC = VDD). At 100 mA load, the output voltage typically sags to −3.8 V from an ideal −5.0 V due to its 12 Ω typical output resistance. Sustained operation above 100 mA may exceed thermal limits in the Micro-8 package.
Does the MC1121DMR2 provide regulated output voltage?
No, the MC1121DMR2 is an unregulated charge-pump inverter. Its output voltage is load-dependent: under light load it delivers approximately −VIN, but drops linearly with increasing current (e.g., −3.8 V at 100 mA from +5 V input). Regulation must be added externally if stable voltage is required.
How does the FC pin affect oscillator frequency and capacitor selection in the MC1121DMR2?
The FC pin sets the internal oscillator frequency: grounded or open → 10 kHz; tied to VDD → 200 kHz. At 200 kHz, smaller 10 µF capacitors suffice for low ripple; at 10 kHz, ≥150 µF is recommended. The ripple frequency equals half the oscillator frequency, so 200 kHz operation yields 100 kHz ripple-easier to filter than 5 kHz.
Can the MC1121DMR2 be used with an external clock source?
Yes, the MC1121DMR2 accepts an external CMOS-compatible clock applied to the OSC pin. The external signal must swing within 100 mV of VDD and GND. When OSC is overdriven, the FC pin has no effect-the oscillator follows the external frequency, enabling synchronization with system clocks or noise-sensitive timing domains.
What is the shutdown behavior of the MC1121DMR2, and what is its minimum supply current in that state?
The MC1121DMR2 enters shutdown when SHDN is pulled low (≤0.4 V). In this state, internal oscillator, logic, and switch drivers are disabled, reducing supply current to ≤1.0 µA across −40°C to +85°C. Input leakage on SHDN and OSC pins remains ≤±1.0 µA, preserving battery life in long-idle portable applications.
MC1121DMR2 Specifications
- Product attributes
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- onsemi
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MC1121DMR2 FAQ
1.How can I place an order for MC1121DMR2 through Aetrix?
Please submit a Request for Quotation (RFQ) for MC1121DMR2 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 MC1121DMR2 reliable?
The price and inventory of MC1121DMR2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MC1121DMR2 is usually 5 days.
3.What payment methods are accepted for MC1121DMR2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MC1121DMR2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MC1121DMR2?
MC1121DMR2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MC1121DMR2 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 MC1121DMR2?
For technical support, including MC1121DMR2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MC1121DMR2 requirements.
6.How does Aetrix verify that MC1121DMR2 is sourced from the original manufacturer or authorized distributors?
All MC1121DMR2 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 MC1121DMR2 meets industry standards.
7.What is the process for return or replacement of MC1121DMR2?
All MC1121DMR2 units undergo pre-shipment inspection (PSI). If there is an issue with MC1121DMR2, 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 MC1121DMR2 part is unused and in its original packaging.
Return procedure for MC1121DMR2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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