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Analog Devices Inc./Maxim Integrated MAX762CSA+T
- Part No.:
- MAX762CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX762CSA+T.pdf
- Description:
- IC REG BOOST ADJ/5V 1.5A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,633
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Product details
Overview
MAX762CSA+T 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 and delivers up to 150mA, making it ideal for flash memory programming in battery-powered PCMCIA cards.
For engineers reviewing the MAX762CSA+T datasheet, MAX762CSA+T pinout, MAX762CSA+T application, or MAX762CSA+T equivalent, key selection considerations include its 15V fixed output, bootstrapped/non-bootstrapped mode flexibility, integrated low-battery comparator (LBI/LBO), 300kHz switching frequency enabling compact magnetics, and shutdown current below 5µA.
Technical Context
The MAX762CSA+T uses a proprietary current-limited PFM control scheme that combines ultra-low quiescent current (≤110µA) with high efficiency (86%) across light to heavy loads by dynamically adjusting peak current limits and enforcing 8µs max on-time and 1.3µs min off-time. Its BiCMOS process integrates a 1Ω LX on-resistance N-channel FET capable of 1A peak current.
It supports dual operating modes: bootstrapped (V+ sensed at output, enables 2.0V start-up and higher efficiency at low VIN) and non-bootstrapped (V+ supplied directly, lower IQ but requires external feedback resistors). The 1.5V reference (±30mV over temp) feeds both FB regulation and the LBI comparator with 20mV hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 15V ±3.6% (14.4V–15.6V); enables direct flash memory VPP programming without external feedback resistors. |
| Max Output Current | 150mA at 5V input; sufficient for standard 5V-to-15V flash programming pulses under typical load conditions. |
| Supply Current | ≤110µA typical; reduces battery drain in always-on or low-duty-cycle portable systems. |
| Shutdown Current | ≤5µA; allows deep sleep states while retaining fast wake-up capability via SHDN pin. |
| Switching Frequency | Up to 300kHz; permits use of small 18µH surface-mount inductors and minimizes EMI filtering requirements. |
| Input Voltage Range | 2.0V to 16.5V; supports single-cell Li-ion (2.7–4.2V), two-cell alkaline (2.0–3.2V), and wide industrial rails. |
| LX Peak Current Limit | 1.0A typical; ensures robust operation into shorted or heavily capacitive loads without external current sensing. |
| Reference Voltage | 1.50V ±30mV; provides stable feedback and low-battery threshold reference across temperature and supply. |
Pinout & Package
MAX762CSA+T is housed in an 8-pin SO (Small Outline) package with 1.27mm pitch, JEDEC MS-012AC compliant, suitable for automated SMT assembly and space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBI | Low-battery comparator input | Voltage sense node for battery monitoring; compared to 1.5V reference to trigger LBO when falling below trip point. |
| 2 SHDN | Active-high shutdown control | TTL/CMOS-compatible enable input; pulls internal bias and reference offline when high, reducing IQ to ≤5µA. |
| 3 V+ | Main power input / output sense | Primary supply rail; in bootstrapped mode, also serves as output voltage feedback reference point. |
| 4 FB | Feedback input | Connects to GND for fixed 15V output (bootstrapped mode only); connects to resistor divider for adjustable outputs. |
| 5 REF | 1.5V precision reference output | Sources up to 100µA; bypassed with 0.1µF capacitor to stabilize regulation and LBI comparator accuracy. |
| 6 GND | Analog and power ground | Common return for internal circuitry, LX switch, and external components; requires star grounding for noise immunity. |
| 7 LX | Internal N-FET drain node | Switching node connected to inductor; features 1Ω on-resistance and 1.5A absolute max peak current rating. |
| 8 LBO | Open-drain low-battery output | Asserts low 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 from 1mA to 150mA load while maintaining ≤110µA IQ - eliminates trade-off between light-load efficiency and full-load performance. |
| Integrated 1A N-channel power FET | Removes need for external MOSFET and gate driver; reduces BOM count and layout complexity in low/medium-power boost applications. |
| Dual-mode operation (bootstrapped/non-bootstrapped) | Bootstrapped mode guarantees 2.0V start-up and higher efficiency below 4V input; non-bootstrapped mode minimizes IQ for longer battery life above 4V. |
| On-chip low-battery detector (LBI/LBO) | Provides system-level battery monitoring with 20mV hysteresis; eliminates need for discrete comparator and reference in portable designs. |
| 300kHz switching frequency | Supports compact 18µH surface-mount inductors and low-ESR ceramic/tantalum output capacitors, reducing solution footprint by >40% vs. 100kHz alternatives. |
| 15V fixed output with internal resistors | Eliminates external feedback network for flash programming supplies, improving accuracy and reliability while simplifying design validation. |
Applications
| Flash Memory Programming | PCMCIA Card Power Supply |
|---|---|
Use Scenario: Generating 15V VPP programming voltage for NOR/NAND flash devices in embedded systems. IC Role / Device Role / Timing Role: Primary step-up regulator delivering regulated 15V at up to 150mA with fast transient response to handle pulse-mode programming currents. Use Value: Eliminates need for external feedback resistors and discrete high-voltage charge pumps, reducing component count and board area by 30%. |
Use Scenario: Providing isolated 15V auxiliary rail for PCMCIA card interface logic and memory programming in laptop expansion slots. IC Role / Device Role / Timing Role: Standby-capable boost converter with SHDN-controlled power gating to meet PCMCIA Type II power sequencing requirements. Use Value: Achieves <5µA shutdown current and 2.0V start-up, extending host battery life during card insertion/removal events. |
| Battery-Powered Portable Instruments | High-Efficiency DC-DC Conversion |
Use Scenario: Powering 15V analog front-ends (e.g., op-amp bias rails, sensor excitation) in handheld test equipment. IC Role / Device Role / Timing Role: Primary DC-DC stage converting single-cell Li-ion (3.0–4.2V) to stable 15V output with minimal thermal rise. Use Value: Delivers 86% peak efficiency across 1–150mA loads, enabling >10-hour runtime on 1000mAh cells without active cooling. |
Use Scenario: Replacing linear regulators or inefficient discrete boost circuits in industrial sensors and IoT edge nodes. IC Role / Device Role / Timing Role: Compact, integrated switching regulator minimizing external component count while meeting IEC 61000-4-4 EFT immunity targets. Use Value: Reduces total solution size to <120mm² and lowers no-load power dissipation by 95% versus 78L05-based solutions. |
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 (vs. 0°C to +70°C for MAX762CSA+T); higher 1.25A peak current limit. | Required for extended temperature industrial or automotive under-hood environments where MAX762CSA+T's commercial grade is insufficient. | Select MAX772CPA+ when operating outside 0°C–70°C or requiring margin above 150mA continuous load. |
| TPS61040DRVR | Adjustable 1.8V–28V output, 28V abs max input, 0.5A switch, but higher 100µA typical IQ and no integrated LBI/LBO comparator. | Suitable for flexible multi-rail designs needing programmable output, but lacks battery monitoring functionality and requires external feedback network. | Choose TPS61040DRVR when output voltage must be customized or input exceeds 16.5V, accepting added BOM and layout complexity. |
Compared with MAX762CSA+T, MAX772CPA+ offers extended temperature range and higher current headroom at the cost of larger DIP-8 packaging, while TPS61040DRVR provides wider output adjustability and input voltage range but sacrifices integrated battery monitoring and fixed-output simplicity.
Availability
MAX762CSA+T is available at Aetrix Electronics and suitable for flash memory programming, PCMCIA card power supplies, and battery-powered portable instrumentation requiring stable component supply with guaranteed long-term sourcing.
Supply support for MAX762CSA+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, communications, and consumer applications.
The MAX761/MAX762 product line was designed specifically for low-power, high-efficiency step-up conversion in battery-critical applications such as flash programming and PCMCIA, emphasizing minimal quiescent current and integrated system functions like low-battery detection.
FAQ
What is the guaranteed minimum start-up voltage for MAX762CSA+T in bootstrapped mode?
The MAX762CSA+T guarantees start-up at 2.0V in bootstrapped mode when using internal feedback resistors (FB tied to GND). This is enabled by dedicated start-up circuitry that fixes 50% duty cycle until V+ reaches 2.5V, after which normal regulation takes over. Below 2.0V, the device remains unpowered and draws negligible current.
Can MAX762CSA+T operate with an adjustable output voltage, and how is it configured?
Yes, MAX762CSA+T supports adjustable output from 5V to 16.5V using external resistors R1 and R2 connected between V+, FB, and GND. For bootstrapped operation, set R2 = R1 × (VOUT − 1.5V)/1.5V with R1 between 10kΩ and 250kΩ. In non-bootstrapped mode, the same resistor network is required, and 1% tolerance resistors are recommended for accuracy.
What is the function of the LBI and LBO pins on MAX762CSA+T, and how are they used?
LBI is the low-battery comparator input referenced to the internal 1.5V reference; LBO is its open-drain output. When LBI falls below 1.5V, LBO pulls low (with external pull-up). To set trip voltage VTRIP, use R3 and R4: R4 = R3 × (VTRIP − 1.5V)/1.5V. Hysteresis of 20mV prevents chatter, and LBO goes high-impedance during shutdown.
How does MAX762CSA+T achieve high efficiency across wide load ranges?
MAX762CSA+T uses a current-limited PFM scheme that dynamically adjusts peak inductor current: first two pulses use half-current (0.5A) for light loads, then escalates to full 1A if regulation isn't achieved. Combined with 8µs max on-time and 1.3µs min off-time enforcement, this maintains 86% efficiency from 1mA to 150mA without sacrificing quiescent current.
What are the key differences between bootstrapped and non-bootstrapped operation of MAX762CSA+T?
In bootstrapped mode, V+ is connected to the output, enabling 2.0V start-up, higher efficiency at low input voltages (<4V), and fixed 15V output (FB = GND). Non-bootstrapped mode powers V+ directly from input, reducing IQ but requiring external feedback resistors and offering no fixed-output option - it's preferred for IQ-sensitive applications above 4V input.
MAX762CSA+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 (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+T FAQ
1.How can I place an order for MAX762CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX762CSA+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 MAX762CSA+T reliable?
The price and inventory of MAX762CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX762CSA+T is usually 5 days.
3.What payment methods are accepted for MAX762CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX762CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX762CSA+T?
MAX762CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX762CSA+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 MAX762CSA+T?
For technical support, including MAX762CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX762CSA+T requirements.
6.How does Aetrix verify that MAX762CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX762CSA+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 MAX762CSA+T meets industry standards.
7.What is the process for return or replacement of MAX762CSA+T?
All MAX762CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX762CSA+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 MAX762CSA+T part is unused and in its original packaging.
Return procedure for MAX762CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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