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Analog Devices Inc./Maxim Integrated MAX761CPA
- Part No.:
- MAX761CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX761CPA.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,583
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Product details
Overview
MAX761CPA 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, fixed 12V output, 150mA load capability at 5V input, and 110µA typical supply current. It operates from 2V to 16.5V input and integrates low-battery detection (LBI/LBO) and 1.5V reference output. Designed for flash memory programming in battery-powered systems.
For engineers reviewing the MAX761CPA datasheet, MAX761CPA pinout, MAX761CPA application, or MAX761CPA equivalent, key selection considerations include its PFM control scheme enabling >86% efficiency across light-to-heavy loads, bootstrapped/non-bootstrapped mode flexibility, 300kHz switching frequency enabling compact magnetics, and integrated LBI comparator with 20mV hysteresis for reliable battery monitoring.
Technical Context
The MAX761CPA uses a proprietary current-limited PFM architecture combining 8µs maximum on-time and 1.3µs minimum off-time one-shots with peak current limiting (1A) to sustain continuous conduction mode (CCM) under heavy loads while maintaining ultra-low quiescent current (<110µA). Its BiCMOS process enables fast start-up (2.0V min), internal 12V regulation, and dual-mode operation-bootstrapped (for higher efficiency below ~4V input) or non-bootstrapped (for lowest IQ).
It integrates a 1.5V bandgap reference (±30mV over temperature), low-battery comparator with 1.5V threshold and 20mV hysteresis, and open-drain LBO output. The LX pin drives external inductors up to 300kHz, supporting 18µH surface-mount magnetics; FB pin allows fixed-output (tie to GND) or adjustable-output (resistor divider) configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (guaranteed 12V @ 5V input, 150mA load) |
| Input Voltage Range | 2.0V to 16.5V - supports single-cell Li-ion, NiMH, and multi-cell alkaline/battery stacks |
| Supply Current | 110µA max - enables >1-year battery life in low-duty-cycle flash programming |
| Shutdown Current | 5µA max - preserves battery during system sleep states |
| Switching Frequency | Up to 300kHz - permits use of small 18µH SMT inductors (e.g., Sumida CD54-180) |
| Peak Switch Current | 1.0A - sustains CCM operation up to 150mA output with minimal ripple |
| Reference Voltage | 1.50V ±30mV - stable bias for external resistor networks and LBI comparator |
Pinout & Package
MAX761CPA is housed in an 8-pin plastic DIP package (0°C to +70°C operating range), with through-hole mounting and standard 0.3-inch width. Pin spacing complies with JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery input | Analog input to internal comparator; threshold = 1.5V; requires resistor divider from V+ to set trip voltage |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible input; tie to GND for normal operation; pulls internal bias off when high |
| V+ | Main power input / output sense | Supplies IC bias; in bootstrapped mode, also senses output voltage for regulation |
| FB | Feedback input | Connect to GND for fixed 12V output; connect resistor divider for adjustable output (5V–16.5V) |
| REF | 1.5V reference output | Sources up to 100µA; bypass with ≥0.1µF ceramic capacitor for stability |
| LX | Switch node | Drain of internal 1A N-MOSFET; connects to inductor and Schottky diode anode |
| GND | Power and signal ground | Common return for all circuits; star-ground connection recommended for noise control |
| LBO | Low-battery open-drain output | Asserts low when LBI < 1.5V; requires external pull-up (e.g., 100kΩ to VOUT) |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables 86% efficiency from 1mA to 150mA load without sacrificing <110µA IQ |
| Integrated 1A N-channel MOSFET | Eliminates external switch; reduces BOM count and PCB area vs. controller-only solutions |
| Bootstrapped/non-bootstrapped dual mode | Optimizes trade-off between efficiency (bootstrapped) and quiescent current (non-bootstrapped) |
| On-chip 1.5V reference with 100µA drive | Supports precision feedback and external LBI threshold setting without additional voltage sources |
| Low-battery detector with hysteresis | 20mV hysteresis prevents chatter; LBO open-drain output interfaces directly with microcontroller GPIO |
Applications
| Flash Memory Programming | PCMCIA Card Power |
|---|---|
Use Scenario: Generating 12V programming voltage for NOR/NAND flash erase/write cycles in portable data loggers. IC Role / Device Role / Timing Role: Primary step-up regulator supplying regulated 12V/150mA with fast transient response to handle burst programming currents. Use Value: Enables single-cell battery operation (2.0V start-up) and extends battery life via 110µA quiescent current during standby. |
Use Scenario: Providing isolated 12V supply for PCMCIA Type II card interface logic and I/O buffers in handheld terminals. IC Role / Device Role / Timing Role: Compact, self-contained boost converter delivering stable 12V rail with integrated LBO for card-insertion battery health check. Use Value: Eliminates need for external MOSFET and gate driver; 300kHz switching allows <5mm inductor footprint compatible with PCMCIA height constraints. |
| Battery-Powered Instrumentation | High-Efficiency DC-DC Conversion |
Use Scenario: Powering 12V analog front-end circuitry (op-amps, ADC drivers) in portable multimeters running from two AA cells. IC Role / Device Role / Timing Role: Efficient voltage booster maintaining regulation down to 2.0V input while providing clean 12V output with low ripple. Use Value: Internal 1.5V reference and LBI comparator enable accurate battery gauge functionality without extra components. |
Use Scenario: Replacing linear regulators in space-constrained industrial sensors where heat dissipation and battery runtime are critical. IC Role / Device Role / Timing Role: High-efficiency (>86%) switching regulator minimizing thermal rise and maximizing energy utilization across variable loads. Use Value: Current-limited PFM architecture delivers consistent efficiency from 1mA to 150mA - outperforming PWM converters at light loads. |
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; adjustable output only; higher max output voltage (up to 28V) | Suitable for >150mA or >16.5V output requirements; requires external FET and gate driver layout | Select when higher output current or voltage headroom is needed; not drop-in compatible due to different pinout and control scheme |
| TPS61200DRCT | Fixed 3.3V/5V options only; 1.8V–5.5V input; 1.2A switch; 1.2MHz switching; no integrated LBI comparator | Better suited for low-input-voltage, high-frequency, low-profile applications; lacks battery monitoring features | Choose for modern ultra-low-VIN designs requiring smaller inductors; omit if LBI/LBO or 12V fixed output is mandatory |
Compared with MAX761CPA, MAX771CPA offers higher output flexibility but demands more external components and layout effort, while TPS61200DRCT provides superior high-frequency integration and lower VIN support but sacrifices the 12V fixed output, LBI/LBO, and ultra-low-IQ advantage critical for legacy flash programming systems.
Availability
MAX761CPA is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered instrumentation requiring stable component supply with long-term industrial lifecycle support.
Supply support for MAX761CPA 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, automotive, and communications markets.
The MAX761CPA belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family designed specifically for battery-powered memory programming and portable peripheral power applications where start-up voltage, shutdown current, and integrated monitoring are critical.
FAQ
What is the minimum input voltage required for MAX761CPA to start up?
The MAX761CPA guarantees start-up at 2.0V when using internal feedback resistors in bootstrapped mode. This is enabled by dedicated start-up circuitry that fixes duty cycle at 50% until V+ reaches 2.5V. With external resistors, undervoltage lockout raises the effective start-up threshold to ~2.7V. The MAX761CPA datasheet confirms this behavior in the Electrical Characteristics table under "Minimum Start-Up Voltage".
Can MAX761CPA be used to generate an adjustable output voltage?
Yes, the MAX761CPA supports adjustable output from 5V to 16.5V using an external resistor divider on the FB pin. For bootstrapped operation, connect R1 between V+ and FB, and R2 between FB and GND; for non-bootstrapped operation, connect the divider between VOUT and GND. The MAX761CPA reference voltage is 1.5V nominal, and the formula R2 = R1 × (VOUT − 1.5)/1.5 applies per the datasheet Design Procedure section.
How does the low-battery detection function work on MAX761CPA?
The MAX761CPA integrates a precision low-battery comparator comparing LBI voltage to its internal 1.5V reference. When LBI falls below 1.5V, LBO (open-drain) pulls low. Hysteresis of 20mV prevents oscillation near the trip point. To set a custom threshold (e.g., 3.3V), use R3 and R4 resistors between V+ and GND with LBI at their junction; R4 = R3 × (VTRIP − 1.5)/1.5. The MAX761CPA LBO remains high-impedance during shutdown.
What is the purpose of the REF pin on MAX761CPA, and how should it be decoupled?
The REF pin on MAX761CPA provides a stable 1.5V ±30mV reference output capable of sourcing up to 100µA for external circuitry such as feedback dividers or comparator biasing. It must be bypassed with a minimum 0.1µF ceramic capacitor placed directly between REF and GND, as specified in the Typical Operating Circuit and Applications Information sections of the MAX761CPA datasheet. Larger capacitors (e.g., 1µF) may improve noise immunity but are not required.
Does MAX761CPA support both bootstrapped and non-bootstrapped operation, and what are the trade-offs?
Yes, MAX761CPA supports both modes. In bootstrapped mode (V+ tied to output), it achieves higher efficiency - especially below 4V input - due to enhanced gate drive, but consumes slightly more supply current. In non-bootstrapped mode (V+ tied to input), IQ drops further (to ~300µA), but efficiency declines at low VIN. Fixed 12V output is only available in bootstrapped mode; non-bootstrapped requires external feedback resistors. The MAX761CPA datasheet details these trade-offs in the Bootstrapped/Non-Bootstrapped Modes section.
MAX761CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX761CPA FAQ
1.How can I place an order for MAX761CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761CPA 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 MAX761CPA reliable?
The price and inventory of MAX761CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761CPA is usually 5 days.
3.What payment methods are accepted for MAX761CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761CPA?
MAX761CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761CPA 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 MAX761CPA?
For technical support, including MAX761CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761CPA requirements.
6.How does Aetrix verify that MAX761CPA is sourced from the original manufacturer or authorized distributors?
All MAX761CPA 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 MAX761CPA meets industry standards.
7.What is the process for return or replacement of MAX761CPA?
All MAX761CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX761CPA, 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 MAX761CPA part is unused and in its original packaging.
Return procedure for MAX761CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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