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Analog Devices Inc./Maxim Integrated MAX1822EPA+
- Part No.:
- MAX1822EPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX1822EPA+.pdf
- Description:
- IC REG CHARG PUMP INV 25MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,886
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Product details
Overview
The MAX1822EPA+ from Maxim Integrated is a high-side power supply IC using a regulated charge pump to generate a stable VOUT = VCC + 11V (typ) output, enabling efficient N-channel MOSFET gate drive in high-side switching circuits. It operates from +3.5V to +16.5V input, draws only 150µA quiescent current (typ), and features a logic-level Power-Ready (PR) output that asserts high when VOUT ≥ VCC + 8.5V - used in battery-load management and stepper motor drivers.
For engineers reviewing the MAX1822EPA+ datasheet, MAX1822EPA+ pinout, MAX1822EPA+ application, or MAX1822EPA+ equivalent, key selection criteria include regulated high-side voltage offset, low IQ for battery life, PR threshold behavior, external capacitor dependencies (C1/C2 ≤ 0.01µF above 13V), and SO-8 package compatibility with legacy MAX622 designs.
Technical Context
The MAX1822EPA+ implements a two-stage switched-capacitor charge pump controlled by an internal RC oscillator (~90kHz nominal), with pulse-skipping regulation to maintain VOUT at VCC + 11V (typ) across its full input range. Regulation occurs via feedback comparing VOUT against an internal reference, disabling the oscillator when the target is exceeded.
Its Power-Ready (PR) output functions as a comparator-driven open-drain signal referenced to ground, switching high at VOUT ≥ VCC + 8.5V (min) and reverting low if VOUT drops below that threshold - providing real-time gate-drive readiness indication for external FETs without requiring additional supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +3.5V to +16.5V - supports wide battery and line-powered systems including portable computers and industrial controls. |
| Output Voltage | VOUT = VCC + 11V (typ), regulated - enables direct gate drive of N-channel MOSFETs without P-channel substitution. |
| Quiescent Current | 150µA (typ) at VCC = 5V - minimizes standby power loss in battery-critical applications like portable computing. |
| Power-Ready Threshold | VOUT ≥ VCC + 8.5V (min) - ensures sufficient gate overdrive before enabling downstream switches, preventing FET linear-mode damage. |
| Output Ripple | 50mVp-p (typ) with C1=C2=0.047µF, C3=1µF - meets noise-sensitive analog control requirements in motor drivers and LDO assist circuits. |
| Switching Frequency | 90kHz (typ), pulse-skipping - reduces EMI vs fixed-frequency pumps while maintaining regulation under dynamic load. |
| Max Output Current | 25mA continuous - supports driving multiple high-side FET gates or biasing op-amps in ultra-low-dropout regulators. |
Pinout & Package
The MAX1822EPA+ is housed in an 8-pin SO (SOIC-N) package, with exposed pad not electrically connected. External component count is minimal: three ceramic capacitors (C1, C2, C3) required for operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C1+) | Primary charge-pump capacitor positive terminal | Connects to + side of C1; defines first-stage pumping node - value affects max IOUT and ripple. |
| 2 (C2−) | Secondary charge-pump capacitor negative terminal | Connects to − side of C2; forms second-stage flying capacitor node - critical for VOUT stability. |
| 3 (PR) | Power-Ready open-drain output | Signals gate-drive readiness; requires external pullup; sinks current when VOUT < VCC + 8.5V. |
| 4 (GND) | Analog and power ground reference | Common return for all internal circuitry and external capacitors - must be low-impedance. |
| 5 (VOUT) | Regulated high-side output voltage | Delivers VCC + 11V (typ); drives FET gates or op-amp supplies - not short-circuit protected. |
| 6 (C2+) | Secondary charge-pump capacitor positive terminal | Connects to + side of C2; completes second-stage charge transfer path - matches C1− polarity. |
| 7 (C1−) | Primary charge-pump capacitor negative terminal | Connects to − side of C1; forms first-stage flying capacitor node - ties to GND during refresh phase. |
| 8 (VCC) | Main input supply voltage | Accepts +3.5V to +16.5V; powers internal logic and oscillator - regulates output relative to this rail. |
Key Features
| Feature | Design Value |
|---|---|
| Regulated high-side voltage generation | Delivers precise VCC + 11V output independent of input variation - eliminates need for discrete Zener or resistor-divider bias networks. |
| Logic-compatible Power-Ready output | Open-drain PR signal simplifies interface to microcontrollers and logic ICs without level-shifting - directly enables gate drivers only when safe. |
| Ultra-low quiescent current | 150µA typical IQ extends battery runtime in always-on portable systems - remains stable across temperature and input voltage. |
| Minimal external components | Only three ceramic capacitors required - reduces BOM cost, board space, and design validation effort versus transformer-based or inductor-based solutions. |
| Pin-for-pin replacement for MAX622 | Enables drop-in upgrade path with identical footprint and function - preserves existing PCB layouts and test fixtures. |
Applications
| High-Side Power Control with N-Channel FETs | Stepper Motor Drivers |
|---|---|
Use Scenario: Driving multiple N-channel MOSFETs as high-side switches in a 5V/12V system where P-channel devices are unavailable or inefficient. IC Role / Device Role / Timing Role: MAX1822EPA+ generates regulated gate-drive voltage (VCC + 11V) to fully enhance N-FETs, replacing costly P-FETs or PNP transistors. Use Value: Enables >95% efficiency in load switching by eliminating conduction losses inherent in P-channel alternatives - validated in 6-channel switch configurations. | Use Scenario: Providing synchronized high-side gate drive for H-bridge motor control in portable medical or lab equipment. IC Role / Device Role / Timing Role: MAX1822EPA+ supplies stable VOUT to IRF541 FET gates in DG303-controlled H-bridge, ensuring fast, matched turn-on across all four quadrant switches. Use Value: Reduces motor jitter and heat generation by guaranteeing minimum VGS margin (>10V) across full VCC range - critical for precise microstepping. |
| Battery-Load Management | Low-Dropout Voltage Regulators |
Use Scenario: Enabling/disabling subsystem loads in battery-powered laptops or handheld instruments using logic-controlled high-side switches. IC Role / Device Role / Timing Role: MAX1822EPA+ powers gate drivers for load-switching FETs, with PR output feeding enable logic to prevent premature activation during power-up. Use Value: Prevents inrush-induced brownouts by delaying load engagement until VOUT reaches safe threshold - improves system reliability during cold-start. | Use Scenario: Assisting LM10-based ultra-low-dropout regulators to achieve <20mV dropout at 1A using SMP60N06 FETs. IC Role / Device Role / Timing Role: MAX1822EPA+ delivers high-side bias to op-amp and reference circuitry, enabling full gate enhancement even at sub-4V input. Use Value: Achieves 19mV dropout at 1A (SMP60N06) - 3.5× improvement over standard LDOs - by eliminating gate-threshold headroom limitation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side power supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX622ESA+ | Same pinout, identical electrical specs, but obsolete - MAX1822EPA+ is its designated replacement per Maxim documentation. | No functional change; direct drop-in replacement with improved availability and extended temp range support. | Select MAX1822EPA+ for new designs or inventory replenishment - guaranteed long-term supply vs discontinued MAX622ESA+. |
| TPS60110PWP | Higher IQ (250µA typ), fixed 5V output (not VCC-referenced), requires four external caps - no PR output. | Suitable for fixed-rail biasing only; cannot replace MAX1822EPA+ in VCC-tracking or PR-dependent safety-critical circuits. | Choose TPS60110PWP only when absolute VCC independence and PR signaling are unnecessary - e.g., powering isolated logic rails. |
Compared with MAX622ESA+, the MAX1822EPA+ offers identical functionality with assured supply continuity; versus TPS60110PWP, it provides VCC-referenced regulation and integrated power-good signaling - essential for robust high-side FET control in variable-input systems.
Availability
MAX1822EPA+ is available at Aetrix Electronics and suitable for battery-load management, stepper motor drivers, high-side N-FET control, and ultra-low-dropout regulator assist applications requiring stable component supply and long-term industrial availability.
Supply support for MAX1822EPA+ 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
Maxim Integrated (now part of Analog Devices) is a U.S.-based semiconductor company specializing in precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing markets.
The MAX1822EPA+ belongs to Maxim's high-efficiency charge-pump power supply product line, designed specifically to replace P-channel FETs and PNP transistors in high-side switching applications while minimizing quiescent power and external component count.
FAQ
What is the maximum input voltage rating for the MAX1822EPA+?
The MAX1822EPA+ has an absolute maximum input voltage (VCC) rating of +17V. Operation beyond this risks permanent damage. The recommended operating range is +3.5V to +16.5V, and for VCC > +13V, C1 and C2 must be limited to 0.01µF to prevent internal switch overstress - a requirement explicitly stated in the datasheet's Note 2 and Electrical Characteristics table.
Does the MAX1822EPA+ provide short-circuit protection on its VOUT pin?
No, the MAX1822EPA+ is not internally short-circuit protected. Its absolute maximum output current is rated at 25mA continuous. If the VOUT node is exposed to potential shorts, external current limiting - such as a series resistor sized to restrict IOUT below 25mA - must be implemented per the datasheet's Output Protection section and formula R ≥ (VOUT × number of channels) / IOUT.
How does the Power-Ready (PR) output of the MAX1822EPA+ behave during startup and overload?
The PR output of the MAX1822EPA+ is an open-drain signal that remains low until VOUT reaches ≥ VCC + 8.5V (min), then pulls high (to VCC level). During operation, if VOUT falls below this threshold - for example, due to overload or input sag - PR immediately reverts low. This real-time feedback allows microcontrollers to disable gate drivers before FETs enter unsafe linear conduction, as confirmed in the Pin Description and Detailed Description sections.
Can the MAX1822EPA+ be used with input voltages below 4V?
The MAX1822EPA+ is specified for operation down to +3.5V, but quiescent current rises sharply below +5V - reaching ~1mA at +4V - because pulse-skipping regulation ceases and the oscillator runs continuously. While functional, efficiency degrades significantly; for sub-4V systems, alternative architectures (e.g., boost regulators) should be evaluated per the Quiescent Supply Current section and Figure 3 in the datasheet.
Is the MAX1822EPA+ pin-compatible with the MAX622 series?
Yes, the MAX1822EPA+ is explicitly documented as a pin-for-pin replacement for the MAX622, sharing identical SO-8 pinout, electrical specifications, and functional behavior. This is confirmed in the General Description ("The MAX1822 is a pin-for-pin replacement to the MAX622") and Ordering Information sections - making it a direct upgrade path with no PCB changes required.
MAX1822EPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Ratiometric
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- Vin+11V
- Voltage - Output (Max):
- -
- Current - Output:
- 25mA
- Frequency - Switching:
- 90kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX1822EPA+ FAQ
1.How can I place an order for MAX1822EPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1822EPA+ 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 MAX1822EPA+ reliable?
The price and inventory of MAX1822EPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1822EPA+ is usually 5 days.
3.What payment methods are accepted for MAX1822EPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1822EPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1822EPA+?
MAX1822EPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1822EPA+ 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 MAX1822EPA+?
For technical support, including MAX1822EPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1822EPA+ requirements.
6.How does Aetrix verify that MAX1822EPA+ is sourced from the original manufacturer or authorized distributors?
All MAX1822EPA+ 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 MAX1822EPA+ meets industry standards.
7.What is the process for return or replacement of MAX1822EPA+?
All MAX1822EPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1822EPA+, 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 MAX1822EPA+ part is unused and in its original packaging.
Return procedure for MAX1822EPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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