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Analog Devices Inc./Maxim Integrated MAX761CSA+T
- Part No.:
- MAX761CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX761CSA+T.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
MAX761CSA+T 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% tolerance), 150mA load capability at 5V input, and 110µA typical quiescent current. It operates from 2V to 16.5V input and integrates low-battery detection (LBI/LBO) for flash memory programming supplies.
For engineers reviewing the MAX761CSA+T datasheet, MAX761CSA+T pinout, MAX761CSA+T application, or MAX761CSA+T equivalent, key selection considerations include its PFM control architecture for ultra-low IQ across light-to-heavy loads, bootstrapped vs. non-bootstrapped mode trade-offs, 1.5V reference accuracy (±30mV), and LBO open-drain comparator hysteresis (20mV).
Technical Context
The MAX761CSA+T uses a proprietary current-limited PFM scheme combining 8µs max on-time and 1.3µs min off-time one-shots with peak-current limiting (1A) to maintain continuous-conduction mode (CCM) under heavy loads while achieving 86% efficiency at 12V/150mA. Its BiCMOS process enables fast start-up (2.0V minimum) and stable operation down to 1.7V in bootstrapped mode.
It features dual-mode operation: bootstrapped (V+ powered from VOUT, enabling higher efficiency below 4V input) and non-bootstrapped (lower IQ but reduced output drive); external resistor feedback supports adjustable outputs from 5V to 16.5V, while internal resistors fix output at 12V. The integrated 1.5V reference (±30mV, 100µA sink/source) feeds both FB and LBI comparators.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 12V ±4% (11.52V–12.48V) - guaranteed regulation at 5V input, 150mA load |
| Input Voltage Range | 2.0V to 16.5V - supports single-cell Li-ion, multi-cell alkaline, and industrial supply rails |
| Quiescent Current | 110µA max - enables >1-year battery life in low-duty-cycle flash programming systems |
| Shutdown Current | 5µA max - 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) |
| Peak Switch Current | 1.0A (typical) - supports CCM operation up to 150mA output with minimal ripple |
| Reference Voltage | 1.50V ±30mV - precision reference for FB feedback and LBI low-battery comparator |
| Low-Battery Threshold | 1.50V ±30mV with 20mV hysteresis - enables accurate, noise-immune battery monitoring |
Pinout & Package
MAX761CSA+T is housed in an 8-pin SO (Small Outline) package, 150mil width, RoHS-compliant, with exposed pad not electrically connected. Thermal resistance θJA = 170°C/W; derating 5.88mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBI | Low-battery input | Analog input to internal comparator; threshold = 1.5V; tie to GND/V+ if unused |
| 2 SHDN | Active-high shutdown control | TTL/CMOS logic input; drives internal bias off when high; connect to GND for normal operation |
| 3 V+ | Power input / output sense | Main supply input; also serves as output voltage sense node in bootstrapped mode |
| 4 FB | Feedback input | Connect to GND for fixed 12V bootstrapped operation; connect resistor divider for adjustable output |
| 5 REF | 1.5V reference output | Stable 1.5V source (±30mV), capable of sourcing/sinking 100µA; bypass with ≥0.1µF ceramic |
| 6 LX | Switch node | Drain of internal 1A N-MOSFET; peak current limited to 1.25A; requires Schottky catch diode (e.g., 1N5817) |
| 7 GND | Ground reference | Common return for all circuits; star-ground connection critical for EMI control |
| 8 LBO | Low-battery open-drain output | Active-low comparator output; requires external pull-up (e.g., 100kΩ to VOUT); high-impedance in shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Combines 86% efficiency at full load with <110µA IQ - eliminates need for separate PWM/PFM mode switching |
| Integrated 1A N-channel MOSFET | Enables complete boost converter with only 5 external components (inductor, diode, 3 caps) - reduces BOM count and board area |
| Bootstrapped operation mode | Allows V+ to be powered from VOUT, increasing gate drive and efficiency below 4V input - critical for single-cell battery apps |
| Dual low-battery detection | LBI/LBO with 20mV hysteresis provides reliable battery monitoring without external comparators or hysteresis circuitry |
| 1.5V precision reference | Stable ±30mV reference shared by FB and LBI - ensures consistent output regulation and trip-point accuracy |
| Fast start-up capability | Starts reliably at 2.0V (min) with internal 50% duty-cycle startup circuit - avoids brown-out during cold battery conditions |
Applications
| Flash Memory Programming Supply | PCMCIA Card Power Management |
|---|---|
Use Scenario: Providing regulated 12V/150mA to program NAND/NOR flash in portable test equipment or embedded programmers. IC Role / Device Role / Timing Role: Primary step-up regulator delivering stable 12V rail with fast transient response to handle burst programming currents. Use Value: Ultra-low 110µA quiescent current extends battery life between programming cycles; internal MOSFET eliminates external switch layout complexity. |
Use Scenario: Generating 12V auxiliary power for PCMCIA Type II card interface logic and I/O buffers in laptop expansion slots. IC Role / Device Role / Timing Role: Standby-capable boost converter activated only during card insertion and configuration. Use Value: 5µA shutdown current prevents battery drain when no card is present; bootstrapped mode maintains efficiency across varying host battery voltages (3.3V–5.5V). |
| Battery-Powered Portable Instruments | High-Efficiency Industrial Sensor Node Supply |
Use Scenario: Powering 12V analog front-ends (e.g., op-amps, ADC drivers) in handheld multimeters or data loggers using two AA cells. IC Role / Device Role / Timing Role: Main DC-DC converter operating across 2.0V–3.2V input range, supporting both active measurement and deep sleep modes. Use Value: 2.0V minimum start-up ensures operation until batteries reach end-of-life; LBO output triggers low-power alert before system reset. |
Use Scenario: Supplying isolated 12V rail for RS-485 transceivers and signal conditioning in battery-backed industrial IoT nodes. IC Role / Device Role / Timing Role: Primary boost stage feeding downstream LDOs or isolated DC-DC modules in energy-constrained edge devices. Use Value: 300kHz switching frequency enables compact 18µH SMT inductor; low ESR capacitor compatibility minimizes output ripple (<100mV) under dynamic sensor load steps. |
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 |
|---|---|---|---|
| MAX770CPA+ | Drives external MOSFET; supports higher output currents (>500mA) and voltages (>20V); no integrated switch; 120µA IQ | Suitable for >200mA loads or >15V outputs where MAX761CSA+T's 150mA/12V limit is insufficient | Select MAX770CPA+ when output power exceeds 1.8W or adjustable high-voltage rails (e.g., 18V) are required |
| TPS61040DRVR | Fixed 28V output option; 500kHz switching; 25µA IQ; no LBI/LBO; requires external compensation | Better suited for ultra-low-power, fixed-high-VOUT apps (e.g., LCD bias) without battery monitoring needs | Choose TPS61040DRVR only if LBO functionality is unnecessary and 28V output matches system requirements |
Compared with MAX770CPA+ and TPS61040DRVR, the MAX761CSA+T uniquely integrates low-battery detection, fixed 12V output with tight tolerance, and bootstrapped operation-making it optimal for flash programming and PCMCIA where simplicity, battery awareness, and sub-4V efficiency are critical.
Availability
MAX761CSA+T is available at Aetrix Electronics and suitable for flash memory programming supplies, PCMCIA card power management, and battery-powered portable instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX761CSA+T 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 MAX761CSA+T belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family designed specifically for battery-critical applications such as flash memory programming and portable peripheral power, emphasizing integration, reliability, and wide-input operation.
FAQ
What is the minimum input voltage required for MAX761CSA+T to start up?
The MAX761CSA+T guarantees start-up at 2.0V in bootstrapped mode with internal feedback resistors. In non-bootstrapped mode or with external resistors, minimum start-up voltage rises to approximately 2.7V due to undervoltage lockout. This behavior is confirmed in the Electrical Characteristics table and Typical Operating Characteristics (Figure MAX761-07).
Can MAX761CSA+T operate with an adjustable output voltage?
Yes, the MAX761CSA+T supports adjustable output from 5V to 16.5V using external resistors R1 and R2 connected to FB and GND per the formula R2 = R1 × (VOUT − 1.5)/1.5. Fixed 12V operation requires connecting FB directly to GND in bootstrapped mode only - non-bootstrapped mode always requires external resistors.
How does the low-battery detector (LBI/LBO) function in MAX761CSA+T?
The MAX761CSA+T's LBI pin compares input voltage against the internal 1.5V reference; when LBI falls below 1.5V, LBO (open-drain) pulls low. Hysteresis of 20mV prevents chatter. LBO is high-impedance during shutdown. A resistor divider (e.g., R3=100kΩ, R4=100kΩ) sets trip point - e.g., 3.0V falling threshold with 3.02V rising threshold.
What is the maximum output current capability of MAX761CSA+T at 3.3V input?
At 3.3V input, the MAX761CSA+T delivers up to 75mA at 12V output in bootstrapped mode, as shown in Figure MAX761-04 ("Maximum Output Current vs. Input Voltage"). Performance degrades in non-bootstrapped mode below 4V input due to reduced gate drive - confirming the design guidance to use bootstrapped mode for inputs <4V.
Does MAX761CSA+T require an external Schottky diode, and what specifications are critical?
Yes, MAX761CSA+T requires an external Schottky diode (e.g., 1N5817) connected from LX to VOUT. Critical specs include 1A average forward current rating, low forward voltage (<0.45V at 150mA), and fast recovery (<100ns). For high-temperature operation (>85°C), silicon fast-recovery diodes like MUR105 are recommended to minimize leakage-induced efficiency loss.
MAX761CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX761CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX761CSA+T 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+T reliable?
The price and inventory of MAX761CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX761CSA+T is usually 5 days.
3.What payment methods are accepted for MAX761CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX761CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX761CSA+T?
MAX761CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX761CSA+T 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+T?
For technical support, including MAX761CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX761CSA+T requirements.
6.How does Aetrix verify that MAX761CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX761CSA+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX761CSA+T?
All MAX761CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX761CSA+T, 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+T part is unused and in its original packaging.
Return procedure for MAX761CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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