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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:4,008
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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. Designed for flash memory programming in battery-powered systems.
For engineers reviewing the MAX762CSA+ datasheet, MAX762CSA+ pinout, MAX762CSA+ application, or MAX762CSA+ equivalent, key selection criteria include its PFM control scheme enabling high efficiency across light-to-heavy loads, bootstrapped/non-bootstrapped mode flexibility, 300kHz switching frequency for compact magnetics, and integrated LBO open-drain comparator with 20mV hysteresis.
Technical Context
The MAX762CSA+ employs a proprietary current-limited PFM architecture combining ultra-low quiescent current (≤110µA) with cycle-by-cycle peak-current limiting (1A) and fixed on/off timing (8µs max on-time, 1.3µs min off-time). This enables continuous-conduction mode (CCM) at heavy loads and discontinuous-conduction mode (DCM) at light loads while maintaining >86% efficiency from 1mA to 150mA.
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). Output is fixed at 15V when FB is grounded or adjustable via external resistor divider; LBI/LBO provide programmable low-battery detection referenced to the internal 1.5V bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V (±3.2% over temp/voltage/load), or adjustable 5V–16.5V using external resistors |
| Max Output Current | 150mA at 5V input → 15V output; derates with lower input voltage per Figure 4 |
| Supply Current | ≤110µA typical (non-bootstrapped), enabling >1000-hour battery life in low-power standby |
| Shutdown Current | ≤5µA, disabling internal bias and reference to minimize system leakage |
| Switching Frequency | Up to 300kHz, allowing use of small 18µH surface-mount inductors (e.g., Sumida CD54-180) |
| Reference Voltage | 1.50V ±30mV (−40°C to +85°C), stable enough to set precise LBI trip points and feedback ratios |
| LX Peak Current Limit | 1.0A typical, enabling CCM operation and robust short-circuit protection without external sensing |
| Input Voltage Range | 2.0V to 16.5V, supporting single-cell Li-ion, multi-cell alkaline, and industrial supply rails |
Pinout & Package
MAX762CSA+ uses an 8-pin SO (Small Outline) package, 150mil width, with standard SOIC thermal and mechanical characteristics (JEDEC MS-012). Pin 1 is marked by beveled corner or dot; device is RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LBI | Low-battery comparator input | Voltage sense node for programmable undervoltage detection; tied to resistor divider to set 1.5V-referenced trip point |
| SHDN | Active-high shutdown control | TTL/CMOS-compatible enable input; pulls internal bias off when high, reducing ICC to ≤5µA |
| V+ | Main power input / output sense | Supplies IC core; in bootstrapped mode, also serves as output voltage feedback path |
| FB | Feedback input | Connect to GND for fixed 15V output (bootstrapped only); connect to resistor divider for adjustable output |
| REF | 1.5V precision reference output | Sources up to 100µA; requires 0.1µF ceramic bypass for stability and noise rejection |
| GND | Analog/digital ground reference | Star-ground connection point for input/output capacitors and inductor return to minimize noise coupling |
| LX | Internal switch drain node | Drives external inductor; features 1Ω on-resistance and 1.5A absolute max peak current rating |
| LBO | Open-drain low-battery output | Sinks current when LBI < 1.5V; requires external pull-up to VOUT or V+ for logic-level signaling |
Key Features
| Feature | Design Value |
|---|---|
| Current-limited PFM control | Delivers 86% efficiency from 1mA to 150mA load without requiring external compensation |
| Integrated 1A N-channel FET | Eliminates need for external MOSFET driver and discrete switch, reducing BOM count and layout area |
| Bootstrapped operation mode | Enables reliable start-up from 2.0V input and improves efficiency below 4V by boosting gate drive from VOUT |
| Programmable low-battery detection | LBI/LBO pair provides hysteresis-stabilized (20mV) undervoltage warning with <2.5µs response time |
| 1.5V precision reference | Stable, low-drift reference usable for external ADC biasing, sensor excitation, or auxiliary regulation |
| 300kHz switching frequency | Permits use of miniature 18µH SMT inductors (e.g., Sumida RCH855-180M) and reduces EMI filter size |
Applications
| Flash Memory Programming | PCMCIA Card Power |
|---|---|
Use Scenario: Providing regulated 15V programming voltage to NOR/NAND flash in portable data loggers during firmware update. IC Role / Device Role / Timing Role: Primary step-up regulator delivering 150mA at 15V with fast transient response to handle burst programming currents. Use Value: Internal 1A FET and PFM control maintain >82% efficiency at 50mA–150mA, extending single-cell Li-ion battery life beyond 500 program cycles. |
Use Scenario: Generating 15V VCC for PCMCIA Type II card interface in handheld test equipment. IC Role / Device Role / Timing Role: Compact, low-noise DC-DC source meeting PCMCIA 2.1 spec for hot-swap power sequencing and voltage tolerance. Use Value: 110µA quiescent current and SHDN control enable <10µA system sleep current when card is inactive. |
| Battery-Powered Medical Sensors | High-Efficiency Portable Instrumentation |
Use Scenario: Powering 15V analog front-end (AFE) in wearable ECG monitor running from coin-cell battery. IC Role / Device Role / Timing Role: Primary voltage booster supplying clean, regulated 15V to op-amps and ADC drivers with minimal ripple. Use Value: REF pin provides stable 1.5V reference for ADC biasing; LBO alerts MCU when battery drops below 3.0V (using 100kΩ/100kΩ divider). |
Use Scenario: Supplying 15V to LCD bias circuitry and op-amp rails in handheld multimeter with dual alkaline cells. IC Role / Device Role / Timing Role: Efficient boost converter operating across full battery range (2.4V–3.2V) while maintaining tight output regulation. Use Value: Bootstrapped mode ensures stable 15V output down to 2.0V input; 300kHz switching minimizes EMI interference with sensitive measurement circuits. |
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 rated for −40°C to +85°C and offered in DIP only; no SO option | Preferred for industrial temperature range and through-hole assembly; lacks SO package for space-constrained designs | Select MAX772CPA+ only if extended temperature range and DIP mounting are required; MAX762CSA+ is superior for commercial-temp SMT layouts. |
| TPS61040DRVR | Adjustable 1.8V–28V output, 28V abs max input, 0.5A switch, but 2.5mA typical IQ - 23× higher than MAX762CSA+ | Better for wide-output-voltage systems; unsuitable for ultra-low-power battery applications due to high quiescent current | Choose TPS61040DRVR only when output adjustability above 15V or higher current is needed; MAX762CSA+ remains optimal for fixed 15V, low-IQ flash programming. |
Compared with MAX772CPA+, MAX762CSA+ offers identical electrical performance in commercial temperature range with smaller SO package and lower cost; compared with TPS61040DRVR, it trades output flexibility for 23× lower quiescent current and proven reliability in flash memory power delivery.
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, long-term lifecycle support, and guaranteed traceable sourcing.
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 designed specifically for ultra-low-power, high-efficiency boost conversion in battery-critical systems such as flash memory programmers and portable peripherals, emphasizing minimal external components and robust start-up behavior.
FAQ
What is the minimum input voltage required for MAX762CSA+ to start up in bootstrapped mode?
The MAX762CSA+ guarantees start-up from 2.0V input in bootstrapped mode when using internal feedback resistors (FB grounded). This is enabled by dedicated start-up circuitry that fixes 50% duty cycle until V+ reaches 2.5V, after which normal PFM control resumes. With external resistors, undervoltage lockout raises the effective start-up threshold to ~2.7V.
Can MAX762CSA+ operate with a 3.3V input to generate 15V output?
Yes, MAX762CSA+ supports 3.3V input in both bootstrapped and non-bootstrapped modes. In bootstrapped mode, it delivers full 150mA at 15V with >80% efficiency; in non-bootstrapped mode, output current capability drops to ~90mA due to reduced gate drive, but supply current falls to ≤110µA - ideal for intermittent-use applications.
How is the low-battery detection threshold set on MAX762CSA+?
The LBI pin compares input voltage to the internal 1.5V reference. To set a falling trip voltage VTRIP, use R3 (10kΩ–500kΩ) and R4 = R3 × (VTRIP − 1.5)/1.5 between V+ and GND, with LBI connected to the R3/R4 junction. Hysteresis of 20mV prevents chatter, and rising trip is VTRIP + 20mV × (1 + R4/R3).
What external components are mandatory for basic MAX762CSA+ operation?
Four components are mandatory: (1) 18µH power inductor (e.g., Sumida CD54-180), (2) Schottky diode (e.g., 1N5817), (3) 33µF output capacitor (low-ESR tantalum or OS-CON), and (4) 0.1µF ceramic capacitor on REF. For fixed 15V output, FB must be grounded; for adjustable output, add two 1% feedback resistors.
Does MAX762CSA+ require a heatsink under maximum load conditions?
No. At 150mA output with 5V input, MAX762CSA+ dissipates <300mW in the SO package (derating 5.88mW/°C above +70°C). Its thermal resistance θJA is ~213°C/W, resulting in ~65°C junction rise - well within the +150°C limit. No heatsink is needed for standard PCB layouts with 1oz copper and 2cm² exposed pad area.
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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