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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:4,816
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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 (±4% over temperature), 110µA max supply current, and 2V to 16.5V input range. It delivers up to 150mA at 12V from a 5V input and integrates low-battery detection (LBI/LBO) and 1.5V reference output - ideal for flash memory programming in battery-powered systems.
For engineers reviewing the MAX761CPA+ datasheet, MAX761CPA+ pinout, MAX761CPA+ application, or MAX761CPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (bootstrapped/non-bootstrapped), real-world efficiency curves, and two rigorously cross-checked alternative parts for 12V boost applications requiring low quiescent current and integrated FETs.
Technical Context
The MAX761CPA+ uses a proprietary current-limited PFM control scheme combining 8µs maximum on-time and 1.3µs minimum off-time one-shots with peak-current limiting (1A) to maintain continuous conduction mode (CCM) under heavy loads while achieving ≤110µA quiescent current at light loads. Its BiCMOS process enables fast start-up (2.0V min) and stable regulation across 0°C to +70°C.
It supports dual operation modes: bootstrapped (V+ powered from VOUT, enabling fixed 12V output and higher efficiency below 4V input) and non-bootstrapped (V+ powered directly, requiring external feedback resistors and offering lower IQ). The internal 1.5V reference (±30mV initial accuracy, 100µA source capability) feeds both FB and LBI comparators, with 20mV hysteresis on the low-battery detector.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (guaranteed over 0°C to +70°C, 4.75V–12V input, 0–150mA load) |
| Input Voltage Range | 2.0V to 16.5V - enables single-cell Li-ion, multi-cell alkaline, or industrial supply compatibility |
| Max Output Current | 150mA at 12V with 5V input - sufficient for flash memory VPP programming pulses |
| Quiescent Current | ≤110µA typical - extends battery life in PCMCIA cards and portable instruments |
| Shutdown Current | ≤5µA - preserves battery during standby via TTL/CMOS-compatible SHDN pin |
| Switching Frequency | Up to 300kHz - allows use of compact 18µH surface-mount inductors (e.g., Sumida CD54-180) |
| Internal Power FET | 1A peak-rated N-channel MOSFET - eliminates external switch, reducing BOM count and layout area |
| Reference Voltage | 1.50V ±30mV - precision reference for FB regulation and LBI comparator threshold |
Pinout & Package
MAX761CPA+ is housed in an 8-pin plastic DIP package (0.300" wide), RoHS-compliant, with through-hole mounting and standard JEDEC MS-001AC footprint. Thermal resistance θJA = 137°C/W; derating begins above +70°C at 9.09mW/°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LBI | Low-battery comparator input | Voltage sense node for battery monitoring; compared to 1.5V reference; 20mV hysteresis prevents chatter |
| 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 / bootstrapped sense | Supplies IC core; in bootstrapped mode, also serves as output voltage feedback path |
| 4 - FB | Feedback input | Connect to GND for fixed 12V bootstrapped operation; connect resistor divider for adjustable output |
| 5 - REF | 1.5V precision reference output | Stable 1.5V source (±30mV, 100µA sink/source); bypassed with ≥0.1µF ceramic capacitor |
| 6 - LX | Power switch drain node | Drain of internal 1A N-MOSFET; requires external Schottky diode (e.g., 1N5817) and inductor |
| 7 - GND | Analog/digital ground | Common return for all circuits; star-ground connection critical for noise-sensitive switching operation |
| 8 - LBO | Open-drain low-battery output | Sinks current when LBI < 1.5V; requires external pull-up to V+ or VOUT; high-impedance in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 86% efficiency at full load with ≤110µA IQ - avoids PWM complexity while matching its heavy-load performance |
| Integrated 1A N-channel MOSFET | Eliminates external switch, reduces component count to just inductor, diode, and two capacitors in basic bootstrapped config |
| Bootstrapped operation mode | Enables fixed 12V output and >2× output current vs. non-bootstrapped mode at VIN < 4V - critical for single-cell systems |
| Low-battery detection with hysteresis | Configurable trip point (e.g., 3.0V via R3/R4 divider) with 20mV hysteresis - prevents false triggers during transient load dips |
| 1.5V precision reference | Stable, buffered 1.5V output usable for external circuitry (e.g., ADC reference or comparator thresholds) |
| Fast start-up from 2.0V | Guaranteed operation initiation at 2.0V input - supports deep-discharge battery recovery without external supervisor |
Applications
| Flash Memory Programming | PCMCIA Card Power Supply |
|---|---|
Use Scenario: Generating 12V VPP programming voltage for NOR/NAND flash in embedded systems or data loggers. IC Role / Device Role / Timing Role: Primary step-up regulator delivering regulated 12V/150mA pulses with fast transient response (<5µs recovery). Use Value: Eliminates need for external MOSFET and gate driver; 110µA IQ extends battery runtime between programming cycles. |
Use Scenario: Providing isolated 12V supply for PCMCIA Type II card interface logic and I/O buffers in portable test equipment. IC Role / Device Role / Timing Role: Standby-capable boost converter with SHDN-controlled power gating and LBO-driven card insertion detection. Use Value: 5µA shutdown current prevents battery drain during card ejection; bootstrapped mode ensures reliable start-up from weak 3.3V rails. |
| Battery-Powered Instrumentation | High-Efficiency DC-DC Converter Module |
Use Scenario: Powering 12V analog front-ends (e.g., op-amp bias, sensor excitation) in handheld multimeters or gas detectors. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 2–5V battery stack to stable 12V rail with minimal thermal rise. Use Value: 86% peak efficiency across 1–150mA load range minimizes heat in sealed enclosures; 2.0V start-up supports end-of-life battery use. |
Use Scenario: Core regulator in compact, low-component-count DC-DC modules for industrial IoT edge nodes. IC Role / Device Role / Timing Role: Integrated boost controller + switch enabling <1 cm² PCB area with only 5 external components. Use Value: Reduces BOM cost by $0.32 vs. discrete-FET solutions; 300kHz switching allows 18µH SMT inductor (Sumida CD54-180) instead of bulky 100µH. |
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+ | Same pinout, identical 12V fixed output, but drives external MOSFET - supports >500mA output and higher input voltages (up to 28V) | Required when >150mA load or >16.5V input needed; adds external FET, gate driver, and higher component count | Select MAX771CPA+ only if output current >150mA or input exceeds 16.5V; otherwise MAX761CPA+ offers lower cost and smaller footprint. |
| TPS61040DRBT | 3–5.5V input range only; 28V max output; 17µA typical IQ; no integrated LBO or REF; 5-pin SOT-23 package | Not suitable for 2V start-up, low-battery monitoring, or 1.5V reference needs; limited to mid-voltage battery systems | Choose TPS61040DRBT only for space-constrained designs with 3–5.5V inputs and no LBO/REF requirements; MAX761CPA+ remains superior for wide-input, feature-rich 12V boost. |
Compared with MAX771CPA+ and TPS61040DRBT, the MAX761CPA+ uniquely balances ultra-low IQ (≤110µA), wide 2–16.5V input, integrated LBO/REF, and fixed 12V output in an 8-pin DIP - making it the optimal choice for cost-sensitive, battery-backed 12V flash programming where external FETs or narrow input ranges are unacceptable.
Availability
MAX761CPA+ is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power supplies, and battery-powered instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
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 computing applications.
The MAX761CPA+ belongs to Maxim's legacy high-efficiency, low-IQ boost converter product line, designed specifically for battery-powered systems needing reliable 12V generation with integrated supervision features - not general-purpose DC-DC conversion.
FAQ
What is the minimum input voltage required for MAX761CPA+ to start up and regulate 12V output?
The MAX761CPA+ guarantees start-up at 2.0V input voltage in bootstrapped mode with internal feedback resistors (Figure 2). This is enabled by dedicated start-up circuitry that fixes 50% duty cycle until V+ reaches 2.5V. Below 2.0V, regulation cannot be maintained. In non-bootstrapped mode with external resistors, undervoltage lockout raises the effective start-up threshold to ~2.7V.
Can MAX761CPA+ operate with a 3.3V input to generate 12V at 100mA?
Yes - the MAX761CPA+ supports 3.3V input and delivers 12V at 100mA in bootstrapped mode. Typical efficiency is ~82% at this condition (per Figure 2 efficiency curve), and output ripple remains <100mV with recommended 18µH inductor and 33µF OS-CON output capacitor. Input current draw is ~380mA, well within the 1A peak switch rating.
How does the low-battery detector (LBI/LBO) function in MAX761CPA+?
The MAX761CPA+ compares LBI voltage to its internal 1.5V reference. When LBI falls below 1.5V, LBO (open-drain) pulls low. A 20mV hysteresis prevents oscillation. For example, with R3 = 100kΩ and R4 = 100kΩ, trip voltage is 3.0V (falling) and 3.02V (rising). LBO is high-impedance during shutdown (SHDN = V+), and LBI must be tied to GND or V+ if unused.
What external components are mandatory for basic MAX761CPA+ operation in fixed 12V bootstrapped mode?
Four components are mandatory: (1) 18µH inductor (e.g., Sumida CD54-180) between V+ and LX; (2) Schottky diode (e.g., 1N5817) anode to LX, cathode to VOUT; (3) 33µF low-ESR output capacitor (e.g., Sanyo OS-CON) from VOUT to GND; (4) 0.1µF ceramic capacitor from REF to GND. FB must be shorted to GND; LBI/LBO may be left unconnected if unused.
Is MAX761CPA+ pin-compatible with MAX761CSA+?
No - MAX761CPA+ uses an 8-pin plastic DIP package (0.300" width), while MAX761CSA+ uses an 8-pin SOIC package (SO). Pin numbering and electrical functions are identical (LBI, SHDN, V+, FB, REF, LX, GND, LBO), but physical dimensions, thermal characteristics (θJA = 137°C/W vs. 213°C/W), and mounting methods differ. PCB layout and reflow profiles are not interchangeable.
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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