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Analog Devices Inc./Maxim Integrated MAX762CSA
- Part No.:
- MAX762CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX762CSA.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,078
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Product details
Overview
MAX762CSA from Maxim Integrated is a high-efficiency, current-limited pulse-frequency-modulated (PFM) step-up DC-DC converter with fixed 15V output, internal 1A N-channel power MOSFET, and 110µA max supply current. It operates from 2V to 16.5V input, delivers up to 150mA, and integrates low-battery detection (LBI/LBO) and 1.5V reference. It is designed for flash memory programming in battery-powered PCMCIA cards.
For engineers reviewing the MAX762CSA datasheet, MAX762CSA pinout, MAX762CSA application, or MAX762CSA equivalent, key selection considerations include its 15V fixed/adjustable output capability, bootstrapped vs. non-bootstrapped mode operation, 300kHz switching frequency enabling compact magnetics, and ultra-low quiescent current critical for standby efficiency in portable systems.
Technical Context
The MAX762CSA employs a proprietary current-limited PFM control scheme that combines sub-110µA light-load supply current with 86% peak efficiency at full load by dynamically adjusting peak current limits (half-limit for first two pulses, full 1A limit thereafter) and enforcing 6–10µs on-time and 1.0–1.6µs off-time windows. Its BiCMOS process enables integrated 1Ω LX on-resistance and fast start-up from 2.0V.
It supports dual operating modes: bootstrapped (V+ powered from VOUT, enabling 12V/15V fixed output and higher efficiency below 4V input) and non-bootstrapped (V+ powered directly from VIN, lower IQ but requires external resistors for all outputs). The internal 1.5V reference (±30mV over temp) feeds both FB regulation and LBI comparator, with 20mV hysteresis on LBO.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V (±3.2%) or adjustable 5V–16.5V via FB resistor divider |
| Max Output Current | 150mA at 5V input → 15V output; derates with input voltage per Figure 4 |
| Supply Current | 110µA max (typ. 300µA at 5V), enabling >1000-hour battery life in low-duty-cycle applications |
| Shutdown Current | 5µA max, reducing system standby drain to negligible levels |
| Switching Frequency | Up to 300kHz, allowing use of 18µH surface-mount inductors <5mm diameter |
| LX Peak Current Limit | 1.0A (min 0.75A), supporting continuous-conduction mode (CCM) under heavy loads |
| Reference Voltage | 1.50V ±30mV (−40°C to +85°C), used for feedback regulation and LBI threshold |
| Input Voltage Range | 2.0V to 16.5V, with guaranteed start-up at 2.0V in bootstrapped mode using internal resistors |
Pinout & Package
MAX762CSA is housed in an 8-pin SO (Small Outline) package, 150mil width, with standard SOIC thermal and mechanical characteristics (JEDEC MS-012). Pin 1 is marked with a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery input | Analog input to internal comparator; trip point = VREF (1.5V); 20mV hysteresis prevents chatter |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible; pulls internal bias and reference offline when high, reducing IQ to ≤5µA |
| V+ | Main power input / output sense | In bootstrapped mode, V+ connects to VOUT; in non-bootstrapped mode, connects to VIN |
| FB | Feedback input | Connect to GND for fixed 15V output (bootstrapped only); otherwise forms resistor divider with V+ and GND |
| REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF bypass capacitor for stability and noise rejection |
| LX | Internal switch drain node | Drain of integrated 1A N-channel MOSFET; peak current limited to 1A; on-resistance ≈1Ω |
| GND | Analog/digital ground | Common return for REF, FB, LBI, SHDN, and power stage; star-ground layout critical for EMI control |
| LBO | Open-drain low-battery output | Sinks current when LBI < 1.5V; requires external pull-up to VOUT or V+; high-impedance during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Enables 86% efficiency across 0.1–150mA load range while maintaining ≤110µA IQ - no PWM gate driver overhead |
| Integrated 1A N-channel FET | Eliminates external switch, reduces BOM count, and ensures matched timing between control and power stage |
| Bootstrapped operation mode | Allows fixed 15V output and higher efficiency at VIN < 4V by powering IC from VOUT instead of VIN |
| Low-battery detector with hysteresis | Provides system-level battery monitoring using same 1.5V reference as FB loop - no extra precision reference needed |
| 300kHz switching frequency | Permits use of tiny 18µH SMT inductors and low-ESR 33µF OS-CON output capacitors - board area < 100mm² typical |
| 2.0V minimum start-up voltage | Guaranteed start-up in bootstrapped mode with internal resistors, enabling single-cell alkaline or NiMH operation |
Applications
| Flash Memory Programming | PCMCIA Card Power Supply |
|---|---|
Use Scenario: Providing regulated 15V programming voltage to NOR/NAND flash devices during erase/write cycles in portable data acquisition units. IC Role / Device Role / Timing Role: Primary step-up regulator generating stable 15V rail; operates in CCM for fast transient response during high-current programming pulses. Use Value: Enables direct single-cell battery (e.g., 3.6V Li-ion) operation without intermediate boost stages, reducing component count and PCB area by 30% vs. discrete solutions. |
Use Scenario: Supplying 15V VCC for PCMCIA Type II card interface logic and I/O buffers in handheld terminals and field meters. IC Role / Device Role / Timing Role: Standby-optimized DC-DC converter; spends >95% of time in ultra-low-IQ PFM mode, waking only during card insertion or data transfer. Use Value: Extends battery runtime beyond 500 hours in intermittent-use applications due to 5µA shutdown current and 110µA active IQ. |
| Battery-Powered Medical Sensors | High-Efficiency Portable Instrumentation |
Use Scenario: Powering 15V analog front-end circuitry (e.g., op-amps, ADC drivers) in wearable ECG monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-noise, low-ripple boost converter; uses ceramic input/output caps and shielded 18µH inductor to meet EN 60601 EMI limits. Use Value: Achieves 100mVpp output ripple at 150mA load with 33µF OS-CON cap - sufficient for 12-bit ADC accuracy without additional LDO post-regulation. |
Use Scenario: Generating 15V bias for photomultiplier tubes or MEMS actuator drivers in handheld spectrometers and gas analyzers. IC Role / Device Role / Timing Role: High-efficiency power stage operating in mixed CCM/DCM depending on load; leverages 300kHz frequency to minimize magnetic size and audible noise. Use Value: Delivers 15V/100mA from 3.3V input at 84% efficiency - 25% higher than comparable PWM converters at same light-load condition. |
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 |
|---|---|---|---|
| MAX772CPA | Same 15V fixed output, but drives external MOSFET; 2A peak drive capability; wider input range (1.8V–16.5V) | Required when >150mA output or >16.5V output needed; supports higher-power flash programming or dual-rail generation | Select MAX772CPA if output current >150mA or design requires external FET for thermal management or voltage scaling. |
| TPS61040DRVR | 15V adjustable via resistor; 28V max output; 0.4A switch; 500kHz switching; no integrated LBI/LBO or REF | Lacks integrated battery monitor and precision reference - requires external components for same functionality | Choose TPS61040DRVR only if higher switching frequency and smaller inductor size are prioritized over integrated monitoring features. |
Compared with MAX762CSA, MAX772CPA offers higher output drive but increases BOM complexity and layout area, while TPS61040DRVR trades away integrated diagnostics and reference for higher frequency and current capability - neither is pin-compatible, and both require PCB redesign.
Availability
MAX762CSA is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power, and battery-powered medical sensors requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX762CSA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX761/MAX762 product line was engineered specifically for ultra-low-power, high-efficiency step-up conversion in space-constrained, battery-operated systems - emphasizing minimal external components, sub-110µA quiescent current, and integrated system monitoring functions.
FAQ
What is the guaranteed output current capability of the MAX762CSA at 3.3V input?
The MAX762CSA guarantees 150mA output at 5V input → 15V. At 3.3V input, maximum output current drops to approximately 85mA (per Figure 4 in datasheet), constrained by duty cycle limits and LX peak current. For reliable 150mA operation below 4V input, bootstrapped mode is required - where V+ is connected to VOUT, not VIN.
Can the MAX762CSA operate with a fixed 15V output without external resistors?
Yes - the MAX762CSA supports fixed 15V output in bootstrapped mode by connecting FB directly to GND. This configuration uses internal feedback resistors and requires no external components for regulation. Fixed output is not available in non-bootstrapped mode, which mandates external resistor dividers on FB.
How does the low-battery detector (LBI/LBO) function in the MAX762CSA?
The MAX762CSA's LBI pin compares input voltage against the internal 1.5V reference; when LBI falls below 1.5V, LBO (open-drain) pulls low. LBO has 20mV hysteresis to prevent oscillation, and is disabled (high-impedance) during shutdown. A resistor divider from V+ to GND sets the trip point - e.g., 100kΩ and 100kΩ yields ~3.0V falling threshold.
What is the difference between bootstrapped and non-bootstrapped operation in the MAX762CSA?
In bootstrapped mode, V+ is connected to VOUT, enabling fixed 15V output, 2.0V start-up, and higher efficiency at low VIN. In non-bootstrapped mode, V+ connects to VIN, reducing supply current but requiring external FB resistors and disabling fixed-output operation. Mode selection affects regulation accuracy, start-up behavior, and light-load efficiency.
Does the MAX762CSA require an external Schottky diode, and what specifications are critical?
Yes - the MAX762CSA requires an external Schottky diode (e.g., 1N5817) in the boost path. Critical specs include 1A average current rating, low forward voltage (<0.45V @ 150mA), and fast recovery (<100ns). For high-temp environments (>85°C), silicon diodes like MUR105 are preferred due to lower leakage versus Schottky.
MAX762CSA 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 (15V)
- 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
MAX762CSA FAQ
1.How can I place an order for MAX762CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX762CSA 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 MAX762CSA reliable?
The price and inventory of MAX762CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX762CSA is usually 5 days.
3.What payment methods are accepted for MAX762CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX762CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX762CSA?
MAX762CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX762CSA 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 MAX762CSA?
For technical support, including MAX762CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX762CSA requirements.
6.How does Aetrix verify that MAX762CSA is sourced from the original manufacturer or authorized distributors?
All MAX762CSA 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 MAX762CSA meets industry standards.
7.What is the process for return or replacement of MAX762CSA?
All MAX762CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX762CSA, 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 MAX762CSA part is unused and in its original packaging.
Return procedure for MAX762CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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