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Analog Devices Inc./Maxim Integrated MAX889RESA
- Part No.:
- MAX889RESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX889RESA.pdf
- Description:
- IC REG CHRG PUMP ADJ 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,805
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Product details
Overview
MAX889RESA from Maxim Integrated is a regulated inverting charge pump DC-DC converter delivering up to 200mA negative output current with adjustable regulated output from –2.5V to –VIN, operating from +2.7V to +5.5V input, and featuring 0.5MHz switching frequency, 0.05Ω regulated output resistance, and 0.1µA shutdown current - used in TFT panel bias supplies and portable measurement instruments.
For engineers reviewing the MAX889RESA datasheet, MAX889RESA pinout, MAX889RESA application, or MAX889RESA equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options for regulated negative voltage generation, and supply-chain support details specific to the R-version (0.5MHz) in 8-pin SO package.
Technical Context
The MAX889RESA implements a continuous-frequency, four-MOSFET switched-capacitor topology with internal oscillator set to 0.5MHz, enabling stable regulation via feedback-controlled flying-capacitor charge rate. It supports both regulated mode (FB connected to resistor divider) and free-run mode (FB tied to IN), with distinct output impedance profiles: 0.05Ω in regulation vs. ~2Ω open-loop.
Its protection architecture includes foldback current limiting with dual thresholds (–0.6V and –1.5V output), soft-start timing (2ms per stage), thermal shutdown at 160°C with 15°C hysteresis, and undervoltage lockout triggered at 2.3V to 2.6V VIN rising edge - all implemented in BiCMOS process with 1840-transistor die.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.5MHz - enables use of 4.7µF flying capacitor and 22µF output capacitor (per Table 1), reducing board area vs. lower-frequency alternatives. |
| Max Output Current | 200mA at VIN = 5V, VOUT = –3.3V - sufficient for LCD bias rails and op-amp dual-supply generation in space-constrained systems. |
| Regulated Output Range | –2.5V to –VIN - allows precise negative rail setting (e.g., –2.5V, –3.3V) using external resistor divider without additional reference IC. |
| Quiescent Current (Regulated) | 3.3mA to 7mA - optimized for battery-powered applications where low-noise, stable negative voltage must coexist with extended runtime. |
| Output Resistance (Regulated) | 0.05Ω - ensures <10mV load regulation error across 0–200mA, critical for analog front-end and sensor bias stability. |
| Shutdown Current | 0.1µA - enables true off-state power gating in portable devices with multi-rail power sequencing. |
| Input Voltage Range | +2.7V to +5.5V - compatible with single-cell Li-ion (3.0–4.2V), 3.3V logic rails, and USB-powered systems. |
Pinout & Package
MAX889RESA is housed in an 8-pin SO (SOIC-N) surface-mount package with standard 1.27mm pitch and JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Positive power supply input | Accepts +2.7V to +5.5V; connects to input capacitor (22µF recommended); feeds internal oscillator and MOSFET drivers. |
| 2 CAP+ | Flying capacitor positive terminal | Connects to + side of 4.7µF ceramic flying capacitor; node switches between VIN and GND during charge-transfer cycles. |
| 3 GND | Power ground return | Main power return path for input, output, and flying capacitor currents; requires low-inductance connection to PCB ground plane. |
| 4 CAP- | Flying capacitor negative terminal | Connects to – side of 4.7µF flying capacitor; node switches between GND and OUT during inversion phase. |
| 5 OUT | Negative regulated output | Delivers –2.5V to –VIN at up to 200mA; connects to 22µF output capacitor and load; low 0.05Ω impedance maintains regulation under dynamic load. |
| 6 SHDN | Logic-controlled shutdown input | CMOS-compatible; drive low (≤0.3×VIN) to enter 0.1µA shutdown; tie to IN for always-on operation. |
| 7 FB | Feedback input for regulation | Serves as error amplifier inverting input; connect to resistor divider between positive reference and OUT to set VOUT; servo target is GND. |
| 8 AGND | Analog ground reference | Separate ground for FB and internal analog circuitry; must be star-connected to GND near device to minimize noise coupling into regulation loop. |
Key Features
| Feature | Design Value |
|---|---|
| 0.5MHz fixed-frequency operation | Enables compact 4.7µF/22µF capacitor solution per Table 1 - reduces total BOM count and PCB area vs. 100kHz charge pumps requiring >10× larger caps. |
| 0.05Ω regulated output resistance | Ensures ≤10mV output deviation from 0 to 200mA load step - eliminates need for post-regulation LDO in precision analog signal chains. |
| Foldback current limit with soft-start | Prevents inrush into large output capacitors and protects alkaline/coin-cell sources by limiting startup current to 200mA, then ramping over 2ms intervals. |
| Thermal shutdown with 15°C hysteresis | Halts switching at 160°C junction temperature and resumes only after cooling to 145°C - avoids oscillatory shutdown/restart during sustained overload. |
| Separate AGND and GND pins | Isolates sensitive feedback reference from high-current power return paths - improves regulation accuracy and ripple rejection in mixed-signal layouts. |
Applications
| TFT Panel Bias Supply | Portable Measurement Instrument |
|---|---|
|
Use Scenario: Generating stable –3.3V or –5V bias for source/drain driver ICs in active-matrix LCD modules. IC Role / Device Role / Timing Role: Regulated negative voltage generator providing low-impedance, low-noise supply for display column drivers. Use Value: 0.05Ω output resistance and <10mV load regulation ensure consistent pixel charging across full display brightness range. |
Use Scenario: Powering dual-supply op-amps and ADC reference buffers in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Compact inverting DC-DC converter delivering clean negative rail from single Li-ion cell (3.0–4.2V). Use Value: 0.1µA shutdown current extends battery life during standby; 0.5MHz operation minimizes EMI interference with sensitive analog measurements. |
| Hard Disk Drive Preamp Supply | Digital Camera Image Sensor Bias |
|
Use Scenario: Providing –2.5V supply for read-channel preamplifiers in 2.5-inch HDDs with tight height constraints. IC Role / Device Role / Timing Role: High-current inverting regulator supporting fast transient response to head-positioning current spikes. Use Value: Foldback current limit and thermal shutdown protect against short-circuit faults during actuator coil energization. |
Use Scenario: Generating –3.3V bias for CMOS image sensor substrate and analog front-end circuits in compact camera modules. IC Role / Device Role / Timing Role: Low-ESR, low-ripple negative voltage source synchronized to imaging frame rate timing. Use Value: 4.7µF flying capacitor and 22µF output capacitor fit within 5mm × 5mm layout envelope required for mobile camera PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated inverting charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX889SESA | 1MHz switching frequency; higher quiescent current (5.5–12mA regulated mode); uses 2.2µF/10µF capacitors. | Better suited for ultra-compact layouts where capacitor size dominates board area, but less optimal for low-quiescent-power battery use. | Select MAX889SESA when PCB space is more constrained than battery life; verify thermal performance at 200mA with smaller caps. |
| MAX889TESA | 2MHz switching frequency; highest quiescent current (11–22mA regulated mode); uses 1µF/4.7µF capacitors. | Targeted at high-density portable electronics needing minimal capacitor footprint, with trade-off in efficiency and heat dissipation. | Choose MAX889TESA only when 1µF flying capacitor is mandatory; confirm PDISS stays below 471mW derated at ambient temperature. |
Compared with MAX889SESA and MAX889TESA, the MAX889RESA offers lowest quiescent current and largest capacitor values - making it the preferred choice for battery-powered instruments and industrial sensors where runtime and thermal margin outweigh minimum footprint requirements.
Availability
MAX889RESA is available at Aetrix Electronics and suitable for TFT panel bias supplies, portable measurement instruments, and hard disk drive preamp circuits requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX889RESA 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) designs precision analog, mixed-signal, and power-management ICs for industrial, automotive, and communications applications.
The MAX889 series was developed specifically for compact, high-current negative voltage generation in space- and power-sensitive systems - targeting display bias, sensor interfaces, and portable instrumentation.
FAQ
What is the maximum output current capability of the MAX889RESA?
The MAX889RESA delivers up to 200mA output current when VIN = 5V and VOUT = –3.3V, as specified in the Electrical Characteristics table. At lower input voltages (e.g., VIN = 3.3V, VOUT = –2.5V), the maximum output current drops to 145mA due to reduced headroom and internal losses. This rating assumes proper thermal management and use of recommended capacitors (4.7µF CFLY, 22µF COUT).
How does the MAX889RESA achieve voltage regulation?
The MAX889RESA achieves regulation by controlling the charge transferred through the flying capacitor (CFLY) via pulse-width modulation of internal MOSFET S1's gate drive. The FB pin senses the output voltage through an external resistor divider and servos to GND, adjusting the charge rate to maintain constant VOUT. In regulated mode, the effective output resistance is 0.05Ω, ensuring tight load regulation.
Can the MAX889RESA operate without external feedback resistors?
Yes, the MAX889RESA supports free-run (unregulated) mode: connect the FB pin directly to the IN pin. In this configuration, the device inverts the input voltage with VOUT ≈ –(VIN – IOUT × 2Ω), using the internal 2Ω open-loop output resistance. Free-run mode eliminates two external resistors but sacrifices output accuracy and load regulation compared to regulated mode.
What capacitor values are required for the MAX889RESA?
Per Table 1 in the datasheet, the MAX889RESA requires a 4.7µF ceramic flying capacitor (CFLY), 22µF output capacitor (COUT), and 22µF input capacitor (CIN) for regulated operation. All capacitors should be X7R dielectric, low-ESR, and placed close to the IC. Using smaller values risks instability or excessive ripple; larger values improve ripple but add cost and board area.
Does the MAX889RESA include protection features?
Yes, the MAX889RESA integrates multiple protection mechanisms: foldback current limiting with dual thresholds (–0.6V and –1.5V), soft-start timing (2ms per recovery stage), thermal shutdown at 160°C with 15°C hysteresis, and input undervoltage lockout (2.3V to 2.6V). These features prevent damage during startup, overload, short-circuit, and overheating conditions without requiring external components.
MAX889RESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Negative
- Topology:
- Charge Pump
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- -2.5V
- Voltage - Output (Max):
- -5.5V
- Current - Output:
- 200mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX889RESA FAQ
1.How can I place an order for MAX889RESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX889RESA 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 MAX889RESA reliable?
The price and inventory of MAX889RESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX889RESA is usually 5 days.
3.What payment methods are accepted for MAX889RESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX889RESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX889RESA?
MAX889RESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX889RESA 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 MAX889RESA?
For technical support, including MAX889RESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX889RESA requirements.
6.How does Aetrix verify that MAX889RESA is sourced from the original manufacturer or authorized distributors?
All MAX889RESA 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 MAX889RESA meets industry standards.
7.What is the process for return or replacement of MAX889RESA?
All MAX889RESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX889RESA, 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 MAX889RESA part is unused and in its original packaging.
Return procedure for MAX889RESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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