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Analog Devices Inc./Maxim Integrated MAX761CSA
- Part No.:
- MAX761CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX761CSA.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,211
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Product details
Overview
MAX761CSA from Maxim Integrated is a high-efficiency, current-limited pulse-frequency-modulated (PFM) step-up DC-DC converter with internal 1A N-channel power MOSFET, 12V fixed output (or adjustable via external resistors), 2V–16.5V input range, and 110µA max supply current. It delivers up to 150mA at 12V from a 5V input and is optimized for flash memory programming supplies in battery-powered systems.
For engineers reviewing the MAX761CSA datasheet, MAX761CSA pinout, MAX761CSA application, or MAX761CSA equivalent, key selection criteria include its ultra-low quiescent current, bootstrapped vs. non-bootstrapped mode flexibility, integrated low-battery comparator (LBI/LBO), 300kHz switching frequency enabling compact magnetics, and guaranteed 12V/150mA output under defined conditions.
Technical Context
The MAX761CSA employs a proprietary current-limited PFM control scheme that combines sub-110µA no-load supply current with 86% peak efficiency across load currents from 1mA to 150mA. Its internal 1Ω LX on-resistance and 1A peak current limit enable continuous-conduction mode (CCM) operation under heavy loads while maintaining light-load efficiency via half-current-limit pulses.
It supports dual operating modes: bootstrapped (V+ powered from VOUT, enabling 2.0V start-up and higher efficiency below 4V input) and non-bootstrapped (V+ powered directly from VIN, minimizing supply current but requiring external feedback resistors). The 1.5V reference (±30mV over temperature) feeds both FB regulation and the LBI low-battery comparator with 20mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V (±4%); adjustable from 5V to 16.5V using external resistor divider |
| Input Voltage Range | 2.0V to 16.5V - enables single-cell Li-ion, multi-cell alkaline, or wide-input industrial rails |
| Max Output Current | 150mA at 12V with 5V input - sufficient for flash memory programming pulses |
| Supply Current | 110µA max (typ. 300µA) - enables >1-year battery life in low-duty-cycle applications |
| Shutdown Current | 5µA max - preserves battery during system sleep states |
| Switching Frequency | Up to 300kHz - allows use of small 18µH surface-mount inductors & low-ESR OS-CON capacitors |
| LX Peak Current Limit | 1.0A - ensures robust CCM operation and limits inductor stress under transient loads |
| Reference Voltage | 1.50V ±30mV - stable reference for both regulation and low-battery detection (LBI threshold) |
Pinout & Package
MAX761CSA is housed in an 8-pin SO (Small Outline) package, 0°C to +70°C operating temperature range, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBI | Low-battery comparator input | Analog input referenced to 1.5V; sets battery depletion threshold via external resistor divider |
| 2 SHDN | Active-high shutdown control | TTL/CMOS-compatible logic input; pulls internal bias off when high, reducing ICC to <5µA |
| 3 V+ | Main power input / output sense node | In bootstrapped mode, powered from VOUT; in non-bootstrapped mode, direct VIN connection |
| 4 FB | Feedback input for output regulation | Connected to GND for fixed 12V bootstrapped operation; tied to resistor divider for adjustable output |
| 5 REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor for stability and noise rejection |
| 6 LX | Drain of internal N-channel power FET | Switching node driving external inductor/diode; 1Ω on-resistance, 1A peak current rating |
| 7 GND | Power and signal ground reference | Star-ground connection point for C1, C2, C4, and PCB return paths to minimize noise coupling |
| 8 LBO | Open-drain low-battery output | Asserts low when LBI < 1.5V; requires external pull-up to V+ or VOUT; high-impedance during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables 86% efficiency from 1mA to 150mA load while maintaining <110µA quiescent current |
| Integrated 1A N-channel power FET | Eliminates external switch; reduces BOM count and layout complexity for low/medium-power boost converters |
| Dual-mode operation (bootstrapped/non-bootstrapped) | Bootstrapped mode guarantees 2.0V start-up and higher efficiency at low VIN; non-bootstrapped minimizes IQ |
| On-chip low-battery detector (LBI/LBO) | 1.5V reference-based comparator with 20mV hysteresis enables reliable battery monitoring without external ICs |
| 300kHz switching frequency | Permits use of tiny 18µH SMT inductors and low-ESR 33µF OS-CON output capacitors for compact designs |
| 1.5V precision reference (REF) | Stable, low-drift reference usable for external circuitry (e.g., ADC bias, sensor excitation) with 100µA sourcing capability |
Applications
| Flash Memory Programming | PCMCIA Card Power Supply |
|---|---|
|
Use Scenario: Generating 12V programming voltage for NOR/NAND flash erase/write cycles in portable devices. IC Role / Device Role / Timing Role: Primary step-up regulator delivering regulated 12V/150mA pulses synchronized to memory controller commands. Use Value: Guarantees full 12V output at 150mA from 5V input, enabling reliable flash programming without external boost stages. |
Use Scenario: Providing isolated 12V auxiliary rail for PCMCIA card interface logic and I/O drivers in laptops and PDAs. IC Role / Device Role / Timing Role: Standby-capable DC-DC converter powering card slot circuitry only during card insertion and data transfer. Use Value: Ultra-low 5µA shutdown current extends host battery life during card-inactive periods. |
| Battery-Powered Instrumentation | High-Efficiency Portable DC-DC Conversion |
|
Use Scenario: Boosting single-cell Li-ion (3.0–4.2V) or triple-alkaline (3.6–4.5V) to stable 12V for analog front-end op-amps and ADC references. IC Role / Device Role / Timing Role: Main power rail generator with integrated low-battery warning (LBI/LBO) for system-level power management. Use Value: Built-in 1.5V reference and comparator eliminate need for discrete supervisor IC, reducing component count by two. |
Use Scenario: Replacing linear regulators or legacy PFM converters in space-constrained portable electronics requiring >85% efficiency across dynamic loads. IC Role / Device Role / Timing Role: High-frequency switching regulator enabling miniaturized magnetic components and low-profile ceramic/OS-CON filtering. Use Value: 300kHz operation allows 18µH inductor and 33µF output capacitor - cutting board area by >40% vs. 100kHz solutions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX771CPA | Drives external MOSFET; no internal switch; supports higher output voltages (>20V) and currents (>500mA) | Used where higher power, adjustable frequency, or external FET control is required - not a drop-in replacement | Select MAX771CPA when output exceeds 150mA or 16.5V, or when thermal management requires remote switching |
| TPS61040DRVR | Higher 500kHz switching frequency; 28V max output; 0.4A switch; 2.9µA shutdown current; no integrated LBI/LBO | Lacks built-in battery monitor; requires external comparator for low-battery signaling | Choose TPS61040DRVR for ultra-low shutdown IQ and smaller inductors, but add discrete LBI/LBO circuitry if monitoring is needed |
Compared with MAX761CSA, MAX771CPA offers higher drive capability at the cost of increased design complexity, while TPS61040DRVR provides lower shutdown current and higher frequency but omits the integrated low-battery detector - making MAX761CSA uniquely suited for flash-programming and battery-monitoring applications in compact, low-component-count designs.
Availability
MAX761CSA is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX761CSA 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX761CSA belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter product line, designed specifically for battery-powered systems needing reliable 12V flash programming supplies with integrated power and battery monitoring functions.
FAQ
What is the minimum input voltage required for MAX761CSA to start up in bootstrapped mode?
The MAX761CSA guarantees start-up at 2.0V in bootstrapped mode when using internal feedback resistors (FB tied to GND). This is enabled by dedicated start-up circuitry that fixes duty cycle at 50% until V+ reaches 2.5V, after which normal regulation takes over. With external resistors in bootstrapped mode, undervoltage lockout raises the effective start-up threshold to ~2.7V.
Can MAX761CSA be used to generate an adjustable output voltage, and what is the supported range?
Yes, the MAX761CSA supports adjustable output from 5V to 16.5V using two external resistors (R1 and R2) connected between V+, FB, and GND. The formula is R2 = R1 × (VOUT − 1.5V)/1.5V, with R1 selected between 10kΩ and 250kΩ. Fixed 12V operation is only available in bootstrapped mode with FB grounded.
How does the low-battery detector (LBI/LBO) function in MAX761CSA, and what is its accuracy?
The MAX761CSA's LBI input compares against the internal 1.5V reference; when LBI falls below 1.5V, the open-drain LBO pin pulls low. It features 20mV hysteresis for noise immunity. Trip voltage is set by a resistor divider (e.g., R3/R4) between V+ and GND, with typical accuracy limited by reference tolerance (±30mV) and resistor matching - achieving ±2% trip point with 1% resistors.
What are the key differences between bootstrapped and non-bootstrapped operation of MAX761CSA?
In bootstrapped mode, V+ is powered from VOUT, enabling 2.0V start-up, higher efficiency below 4V input, and fixed 12V output (FB = GND). In non-bootstrapped mode, V+ connects directly to VIN, minimizing supply current but requiring external resistors for all outputs and disabling fixed-voltage operation. Efficiency drops at low VIN due to reduced gate drive.
Is MAX761CSA compatible with ceramic output capacitors, or is a specific type required?
The MAX761CSA is optimized for low-ESR output capacitors such as Sanyo OS-CON organic polymer or Nichicon PL-series electrolytics (e.g., 33µF/16V with ≤100mΩ ESR). While ceramic capacitors can be used, their near-zero ESR may increase high-frequency ripple amplitude and reduce efficiency; a 10–22µF ceramic in parallel with a 22–47µF low-ESR tantalum or polymer cap is recommended for best stability and transient response.
MAX761CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 5V (12V)
- Voltage - Output (Max):
- 16.5V
- Current - Output:
- 1.5A (Switch)
- Frequency - Switching:
- 300kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX761CSA FAQ
1.How can I place an order for MAX761CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761CSA 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 MAX761CSA reliable?
The price and inventory of MAX761CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761CSA is usually 5 days.
3.What payment methods are accepted for MAX761CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761CSA?
MAX761CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761CSA 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 MAX761CSA?
For technical support, including MAX761CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761CSA requirements.
6.How does Aetrix verify that MAX761CSA is sourced from the original manufacturer or authorized distributors?
All MAX761CSA 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 MAX761CSA meets industry standards.
7.What is the process for return or replacement of MAX761CSA?
All MAX761CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX761CSA, 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 MAX761CSA part is unused and in its original packaging.
Return procedure for MAX761CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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