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Analog Devices Inc./Maxim Integrated MAX4193CSA+T
- Part No.:
- MAX4193CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4193CSA+T.pdf
- Description:
- IC REG BOOST ADJ 525MA 8SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX4193CSA+T from Maxim Integrated is a CMOS micropower step-up switching regulator IC integrating a 1.31V bandgap reference, oscillator, voltage comparator, and 375mA N-channel output MOSFET in an 8-pin SO package. It operates from 2.0V to 16.5V input, delivers up to 5W output, achieves 85% typical efficiency, and features logic-level shutdown (<1µA quiescent current) for battery-powered DC-DC conversion in portable instrumentation and low-power embedded systems.
For engineers reviewing the MAX4193CSA+T datasheet, MAX4193CSA+T pinout, MAX4193CSA+T application, or MAX4193CSA+T equivalent, key selection criteria include its 70µA operating current, ±1.5% output voltage accuracy (via external feedback), 525mA peak LX drive capability, low-battery detection (LBR/LBD pins), and compatibility with RC4191/2/3 bipolar regulators in space-constrained boost converter designs.
Technical Context
The MAX4193CSA+T implements pulse-frequency modulation (PFM) with a constant-frequency oscillator-its output MOSFET (pin 3, LX) switches on only when the feedback voltage at VFB (pin 7) falls below 1.31V, enabling variable duty cycle via pulse skipping. The internal 4Ω N-channel MOSFET driver supports peak currents up to 525mA and exhibits temperature-dependent on-resistance, dropping from ~8Ω at −50°C to ~4Ω at +125°C under +6V supply.
It integrates dual comparator functions: one for regulation (COMP1, comparing VFB to 1.31V reference) and another for low-battery detection (COMP2, comparing LBR at pin 1 to same reference). The LBD output (pin 8) is an open-drain N-MOSFET sinking up to 600µA, while shutdown is asserted by driving IC (pin 6) below 0.2V or leaving it floating-reducing supply current to ≤1µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.0V to 16.5V - supports single-cell Li-ion, multi-cell alkaline/NiCd, and wide-input industrial rails without external LDO pre-regulation. |
| Output Drive Capability | 525mA peak at LX - enables direct drive of standard 470µH–1mH inductors for 20–50mA output loads in compact boost topologies. |
| Operating Current | 70µA typical - ensures >80% efficiency even at 100µW load levels, critical for battery life extension in always-on sensors. |
| Reference Voltage | 1.31V ±0.06V - sets precise output voltage via external resistor divider (e.g., 499kΩ/47.5kΩ for +15V), minimizing trimming requirements. |
| Shutdown Quiescent Current | ≤1µA - allows system-level power gating with negligible standby drain, supporting multi-year operation on coin cells. |
| Oscillator Frequency Range | 0.1kHz to 75kHz - set by external CX capacitor (e.g., 47pF = 40kHz); lower frequencies increase peak inductor current for higher output power at reduced input voltage. |
| Low-Battery Detection Threshold | 1.31V at LBR (pin 1) - provides accurate undervoltage warning independent of supply rail, usable for battery monitoring or adaptive frequency scaling. |
Pinout & Package
MAX4193CSA+T is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBR | Low-battery comparator input | Monitors external voltage source; asserts LBD when <1.31V - used for battery cutoff or power-fail detection without additional components. |
| 2 CX | Oscillator timing capacitor node | Connects to ground via ceramic capacitor (e.g., 47pF) to set switching frequency; stray capacitance must be minimized for stable operation. |
| 3 LX | N-channel MOSFET output driver | Drives external inductor; 4Ω typical RON at +6V, 525mA peak rating - requires catch diode (e.g., 1N4148 or Schottky) and proper PCB layout for thermal management. |
| 4 GND | Analog and power ground reference | Must be low-impedance star point; separates analog bias and high-current LX return paths to prevent regulation instability. |
| 5 +VS | Main supply input | Accepts 2.0V–16.5V; can be bootstrapped from output for improved RON, though increases operating current linearly with voltage. |
| 6 IC | Logic-level shutdown control | Drives <0.2V or floats to disable all internal circuitry; pullup to +VS required for normal operation - enables microcontroller-controlled power sequencing. |
| 7 VFB | Feedback voltage input | Compares divided output voltage to 1.31V reference; 10nA max input bias allows high-value resistive dividers (>1MΩ) to minimize power loss. |
| 8 LBD | Open-drain low-battery detector output | Sinks up to 600µA when LBR <1.31V - interfaces directly to µC interrupt or LED driver without level-shifting. |
Key Features
| Feature | Design Value |
|---|---|
| CMOS micropower architecture | 70µA operating current enables >10-year battery life in 10µA average-load applications like remote sensors and wearables. |
| Integrated 1.31V precision reference | ±0.06V tolerance over 0°C to +70°C eliminates need for external voltage reference, reducing BOM count and layout area. |
| Onboard 525mA peak LX driver | Replaces discrete MOSFET + gate driver in low-to-mid power boost converters, simplifying design and improving reliability. |
| Pin compatibility with RC4191/2/3 | Direct drop-in replacement for legacy Raytheon bipolar regulators, enabling efficiency upgrades without PCB redesign. |
| Dual comparator functionality | Single die performs both output regulation and low-battery monitoring - reduces component count versus separate supervisor ICs. |
Applications
| +5V to +15V DC-DC Converter | High-Efficiency Battery-Powered DC-DC |
|---|---|
Use Scenario: Generating regulated +15V from a +5V USB or logic rail for op-amp biasing, sensor excitation, or analog front-end circuits. IC Role / Device Role / Timing Role: Step-up switching regulator controlling LX duty cycle via VFB feedback loop; oscillator sets 40kHz switching frequency. Use Value: Delivers 20mA at 85% efficiency using only 470µH inductor, 47pF CX, and 1N4148 diode - eliminates need for external controller or gate driver. |
Use Scenario: Powering portable medical devices (e.g., glucose meters, pulse oximeters) from single 3V coin cell or AA battery. IC Role / Device Role / Timing Role: Micropower boost regulator with shutdown control (IC pin) and low-battery alert (LBR/LBD) for system-level power management. Use Value: 70µA quiescent current extends battery life beyond 5 years in sleep mode; LBD output triggers firmware-initiated graceful shutdown before brownout. |
| +3V to +5V DC-DC Converter | Uninterruptible 5V Power Supply |
Use Scenario: Converting 2.4–3.6V battery voltage to stable +5V for MCU, display, or USB peripheral operation in handheld instruments. IC Role / Device Role / Timing Role: PFM-controlled boost converter adapting switching frequency (via optional LBR-triggered oscillator scaling) to maintain output power as battery depletes. Use Value: Maintains ≥40mA output at >80% efficiency down to 2.0V input - avoids premature system shutdown during battery discharge. |
Use Scenario: Providing glitch-free +5V backup during AC mains failure in industrial controllers, POS terminals, or network edge devices. IC Role / Device Role / Timing Role: Always-on boost regulator powered from either line-derived 4.4V or NiCd battery; LBD monitors main rail for failover initiation. Use Value: Zero-interruption switchover with no output droop or reset - eliminates need for supercapacitors or complex power-path management ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up switching regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX630CSA+ | Identical pinout and core architecture; differs in internal reference voltage tolerance (±0.04V vs. ±0.06V for MAX4193) and tighter line/load regulation specs. | Preferred where ±1.5% untrimmed output accuracy is required (e.g., precision analog supplies); less tolerant of high-ESR feedback dividers. | Select MAX630CSA+ when reference stability over temperature is critical; MAX4193CSA+T offers wider input range margin (2.0V min vs. 2.2V) and better low-voltage startup. |
| TPS61040DRVR | Higher 28V input rating, 0.5A switch current, integrated soft-start, but requires external compensation and lacks LBD function. | Suitable for higher-power boost (≥100mA) or wide-input industrial apps; no native low-battery monitoring - needs external supervisor. | Choose TPS61040DRVR for >50mA loads or >16.5V inputs; MAX4193CSA+T remains optimal for ultra-low-IQ, integrated monitoring, and RC419x drop-in replacement. |
Compared with MAX630CSA+, MAX4193CSA+T trades minor reference accuracy for broader 2.0V startup and relaxed line regulation, while versus TPS61040DRVR it prioritizes micropower operation and integrated monitoring over raw current capability - making it ideal for cost-sensitive, battery-constrained designs requiring minimal external components.
Availability
MAX4193CSA+T is available at Aetrix Electronics and suitable for portable instrumentation, battery-backed memory modules, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX4193CSA+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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX4193CSA+T belongs to Maxim's legacy micropower DC-DC converter product line, designed specifically for space- and energy-constrained battery-operated systems requiring simple, reliable, and component-minimal boost regulation.
FAQ
What is the minimum input voltage required for MAX4193CSA+T to start switching?
The MAX4193CSA+T guarantees startup at +VS ≥ 2.0V across the full 0°C to +70°C operating range. At room temperature, functional operation begins as low as 1.9V per datasheet Electrical Characteristics table. This enables reliable operation from partially discharged alkaline or LiFePO₄ cells without external wake-up circuitry - a key advantage over competing regulators with 2.5V+ startup thresholds.
Can MAX4193CSA+T be used in buck or inverting configurations?
No - the MAX4193CSA+T is architecturally optimized for non-inverting step-up (boost) topology only. Its internal N-channel MOSFET is configured as a low-side switch driving the inductor to ground; it lacks the high-side drive, synchronous rectification, or polarity-reversal capability needed for buck or buck-boost operation. For inverting applications, Maxim recommends the MAX632 or discrete solutions.
How does the low-battery detector (LBD) function in MAX4193CSA+T?
The MAX4193CSA+T LBD circuit compares the voltage at LBR (pin 1) to the internal 1.31V reference. When LBR falls below this threshold, the open-drain LBD output (pin 8) pulls low, sinking up to 600µA. This signal can directly drive a microcontroller interrupt pin or LED indicator - no external transistor or pullup is required unless interfacing to >5V logic.
What is the recommended inductor value for a +3V to +5V, 40mA MAX4193CSA+T design?
For +3V to +5V at 40mA output, a 470µH molded inductor (e.g., Dale IHA-104) with ≤0.5Ω DCR is recommended. This value balances peak current (≈150mA), efficiency (~85%), and physical size. Lower inductance (e.g., 220µH) increases output current capability but raises ripple and EMI; higher values reduce available power and may cause regulation dropout at light loads.
Is MAX4193CSA+T pin-compatible with RC4191/2/3, and what are the benefits?
Yes - MAX4193CSA+T is fully pin-compatible with Raytheon RC4191/2/3 bipolar regulators. Benefits include direct drop-in replacement with >3× higher efficiency, 100× lower quiescent current (70µA vs. ~7mA), extended low-voltage operation (2.0V vs. 4.5V min), and elimination of base-drive resistors - all without modifying PCB layout or bill of materials.
MAX4193CSA+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
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 3.5V
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 525mA (Switch)
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4193CSA+T FAQ
1.How can I place an order for MAX4193CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4193CSA+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 MAX4193CSA+T reliable?
The price and inventory of MAX4193CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4193CSA+T is usually 5 days.
3.What payment methods are accepted for MAX4193CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4193CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4193CSA+T?
MAX4193CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4193CSA+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 MAX4193CSA+T?
For technical support, including MAX4193CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4193CSA+T requirements.
6.How does Aetrix verify that MAX4193CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX4193CSA+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 MAX4193CSA+T meets industry standards.
7.What is the process for return or replacement of MAX4193CSA+T?
All MAX4193CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4193CSA+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 MAX4193CSA+T part is unused and in its original packaging.
Return procedure for MAX4193CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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