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Analog Devices Inc./Maxim Integrated MAX4193CSA
- Part No.:
- MAX4193CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4193CSA.pdf
- Description:
- IC REG BOOST ADJ 150MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:15,128
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Product details
Overview
MAX4193CSA from Maxim Integrated is a CMOS micropower step-up switching regulator IC designed for compact, high-efficiency DC-DC conversion in battery-powered systems. It integrates a 1.31V bandgap reference, oscillator, voltage comparator, and 375mA N-channel output MOSFET in an 8-pin SO package, operates from 2.0V to 16.5V input, delivers up to 5W output, and features logic-level shutdown with <1µA quiescent current - used in +3V-to-+5V and +5V-to-+15V converters for portable instrumentation and low-power embedded supplies.
For engineers reviewing the MAX4193CSA datasheet, MAX4193CSA pinout, MAX4193CSA application, or MAX4193CSA equivalent, key selection considerations include its 70µA typical operating current, ±1.5% internal reference accuracy, 4Ω LX on-resistance, 40kHz typical switching frequency (set by external CX capacitor), and integrated low-battery detector with 1.31V threshold - all critical for ultra-low-power boost converter design and battery-life extension circuits.
Technical Context
The MAX4193CSA implements pulse-frequency modulation (PFM) using a constant-frequency oscillator and comparator-based feedback loop: the internal 1.31V reference compares against a resistor-divided VFB signal to control LX switching. When output voltage drops below regulation, the oscillator pulses enable the N-channel MOSFET at pin 3 (LX), storing energy in the external inductor; when regulated, pulses are skipped to reduce average duty cycle.
Its low-battery detector (LBR/LBD pins) operates independently using the same 1.31V reference, enabling dual-function monitoring without external components. The IC input (pin 6) provides logic-level shutdown, disabling analog circuitry, oscillator, LX, and LBD outputs while drawing ≤1µA - essential for intermittent operation in energy-harvesting and sensor-node applications.
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 industrial supply rails without external regulators. |
| Internal Reference Voltage | 1.31V ±0.06V - sets output voltage accuracy via external resistive divider (e.g., ±3.5% untrimmed output with 1% R1/R2). |
| LX Output Driver | N-channel MOSFET, 4Ω on-resistance, 525mA peak current - enables efficient inductor drive with minimal conduction loss in boost topologies. |
| Operating Current | 70µA typical at +6V - ensures >85% efficiency even at light loads (e.g., 5mW–100mW), critical for battery longevity. |
| Shutdown Current | ≤1µA maximum - reduces system standby power to nanoampere levels when IC pin is <0.2V or floating. |
| Oscillator Frequency | 40kHz typical (47pF on CX pin) - balances switching loss vs. inductor size; adjustable from 0.1kHz to 75kHz with capacitor change. |
| Low-Battery Threshold | 1.31V on LBR pin - triggers open-drain LBD output to sink up to 600µA, enabling direct interface to microcontroller GPIO or reset logic. |
Pinout & Package
MAX4193CSA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm, 1.75mm height, gull-wing leads, JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LBR | Low-battery detector input | Compares external voltage to 1.31V reference; sinking LBD output activates when LBR < 1.31V - used for battery monitoring or power-fail detection. |
| 2 CX | Oscillator timing capacitor connection | External ceramic capacitor (e.g., 47pF) sets switching frequency; stray capacitance must be minimized for stable operation. |
| 3 LX | Switching node driver output | Drives external inductor with integrated N-MOSFET; 4Ω on-resistance and 525mA peak rating define max deliverable power and thermal limits. |
| 4 GND | Analog and power ground | Common return for reference, comparator, oscillator, and LX current path - requires low-impedance PCB layout to prevent noise coupling. |
| 5 +VS | Main supply input | Accepts 2.0V–16.5V; can be bootstrapped from boosted output for lower LX on-resistance or tied directly to input for lowest quiescent current. |
| 6 IC | Logic-level shutdown control | Drives <0.2V or floats to enter shutdown (<1µA); connect to +VS or CMOS high for normal operation - no pullup resistor needed. |
| 7 VFB | Feedback voltage input | Resistive divider from output sets regulation point: VOUT = 1.31V × (1 + R1/R2); bias current ≤10nA allows high-value resistors for low power. |
| 8 LBD | Low-battery detector open-drain output | Sinks up to 600µA when LBR < 1.31V - requires external pullup to +VS or logic rail for active-low interrupt or reset signaling. |
Key Features
| Feature | Design Value |
|---|---|
| CMOS micropower architecture | 70µA typical operating current enables >85% efficiency at 10mW load - extends battery life in always-on sensors and wearables. |
| Integrated 1.31V bandgap reference | ±0.06V tolerance over 0°C to +70°C - eliminates external reference, reduces BOM count, and ensures stable feedback across temperature. |
| Onboard N-channel MOSFET switch | 4Ω on-resistance at +6V supply - lowers conduction loss vs. bipolar alternatives, reducing heat generation in space-constrained designs. |
| Programmable oscillator via CX pin | 47pF sets 40kHz; frequency scalable from 0.1kHz to 75kHz - allows optimization of inductor size, EMI, and efficiency per application. |
| Dual-function low-battery detector | Shared 1.31V reference with VFB path - enables simultaneous output regulation and battery monitoring without extra components or calibration. |
Applications
| +5V to +15V DC-DC Converter | High-Efficiency Battery-Powered DC-DC |
|---|---|
Use Scenario: Generating regulated +15V at 20mA from a +5V input in portable test equipment. IC Role / Device Role / Timing Role: MAX4193CSA acts as the primary step-up controller, managing LX switching, feedback regulation, and oscillator timing to maintain stable output under varying load. Use Value: Achieves 85% efficiency with standard molded inductors, eliminating need for external gate drivers or precision references - reduces board area by >30% vs. discrete solutions. |
Use Scenario: Powering low-duty-cycle wireless sensor nodes from 3V coin cells or AA batteries. IC Role / Device Role / Timing Role: MAX4193CSA provides regulated 5V during active transmission bursts, then enters <1µA shutdown between transmissions. Use Value: 70µA operating current and sub-µA shutdown extend usable battery life to >5 years in 1-second-per-minute wake-up profiles. |
| +3V to +5V DC-DC Converter | Uninterruptible 5V Power Supply |
Use Scenario: Converting 3V battery input to stable +5V for microcontroller logic in handheld medical devices. IC Role / Device Role / Timing Role: MAX4193CSA serves as the core boost regulator, using VFB feedback and LBR monitoring to sustain output during battery voltage sag. Use Value: Built-in low-battery detector triggers graceful shutdown before brownout, preventing data corruption - no additional supervisor IC required. |
Use Scenario: Providing glitch-free +5V backup during AC mains failure in industrial controllers. IC Role / Device Role / Timing Role: MAX4193CSA continuously regulates output from either line-derived 4.4V or NiCd battery, with seamless switchover and LBD signaling power loss. Use Value: Eliminates mechanical relays or diode-ORing losses; maintains regulation during transfer with zero output droop or spike - meets IEC 61000-4-11 hold-up requirements. |
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, same 1.31V reference and LX driver specs, but ±1.5% reference accuracy (vs. MAX4193's ±0.06V over temp) and higher 90µA typical supply current. | Less precise output regulation; suited for cost-sensitive, non-critical 5V/12V supplies where ±5% tolerance is acceptable. | Select MAX630CSA only if reference accuracy and quiescent current are secondary to legacy compatibility or lower unit cost. |
| TPS61040DRVR | Higher 28V input rating, 0.5A switch current, 500kHz fixed-frequency PWM (vs. MAX4193's PFM), no integrated LBD function. | Better for high-output-current (>100mA) or high-input-voltage (>16.5V) applications; requires external battery monitor for low-VBAT detection. | Choose TPS61040DRVR when higher power density or tighter output ripple is required, accepting added component count for LBD functionality. |
Compared with MAX630CSA, the MAX4193CSA offers tighter reference stability and lower operating current for precision low-power designs; compared with TPS61040DRVR, it trades higher-frequency PWM for ultra-low-quiescent PFM operation and integrated battery monitoring - making MAX4193CSA optimal for long-life, single-battery, space-constrained systems.
Availability
MAX4193CSA is available at Aetrix Electronics and suitable for +3V-to-+5V DC-DC converters, uninterruptible 5V power supplies, and high-efficiency battery-powered DC-DC converters requiring stable component supply, long-term lifecycle support, and traceable sourcing for medical, industrial, and portable electronics programs.
Supply support for MAX4193CSA 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, communications, and consumer applications.
The MAX4193CSA belongs to Maxim's micropower DC-DC converter product line, engineered specifically for ultra-low-quiescent-current boost regulation in battery-critical systems - emphasizing efficiency at microampere loads, integrated monitoring functions, and minimal external component count.
FAQ
What is the maximum output power achievable with the MAX4193CSA?
The MAX4193CSA supports up to 5W output power in optimized designs, constrained by its 525mA peak LX current, 4Ω on-resistance, and thermal limits of the 8-pin SO package. Real-world output depends on input voltage, inductor value, switching frequency, and PCB thermal design - for example, +3V-to-+5V at 40mA (200mW) achieves 85% efficiency, while +5V-to-+15V at 20mA (300mW) is typical. The MAX4193CSA datasheet specifies operation across the 5mW to 5W range.
Does the MAX4193CSA require an external Schottky diode, and why?
Yes, the MAX4193CSA requires an external Schottky diode (e.g., 1N5817) in standard boost configurations. Because the LX pin drives the inductor's primary side, the diode provides the freewheeling path when the MOSFET turns off - recovering stored inductor energy to the output capacitor. Schottky diodes are mandatory due to their fast turn-on time and low forward voltage (~0.3V), minimizing conduction loss and preventing excessive heating that would occur with slower silicon rectifiers like 1N4001.
Can the MAX4193CSA operate with input voltages below 2.0V?
No, the MAX4193CSA has a specified minimum input voltage of 2.0V per its Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 2.0V is not guaranteed: startup may fail, reference accuracy degrades, and oscillator frequency becomes unstable. While some units may function down to ~1.9V under ideal conditions, this violates the datasheet specification and is not recommended for production designs - use the MAX4193CSA only within its validated 2.0V–16.5V input range.
How does the low-battery detector (LBD) function in the MAX4193CSA?
The MAX4193CSA's low-battery detector compares the voltage on pin 1 (LBR) to its internal 1.31V reference. When LBR falls below 1.31V, the open-drain pin 8 (LBD) sinks up to 600µA, allowing direct connection to a microcontroller GPIO (with pullup) for interrupt generation or system reset. The detector shares the same reference as the VFB regulation path, ensuring consistent threshold tracking across temperature - no external components are needed for basic battery monitoring.
Is the MAX4193CSA pin-compatible with the RC4191/2/3 series?
Yes, the MAX4193CSA is explicitly documented as pin-compatible with Raytheon's bipolar RC4191, RC4192, and RC4193 DC-DC controllers. This allows drop-in replacement in existing designs, delivering improved efficiency (85% vs. ~65%), lower operating current (70µA vs. ~2mA), and extended low-voltage operation (down to 2.0V vs. ~3.5V) - all without PCB layout changes or component substitution beyond the IC itself.
MAX4193CSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 2.4V
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 150mA (Switch)
- Frequency - Switching:
- 25kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4193CSA FAQ
1.How can I place an order for MAX4193CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4193CSA 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 reliable?
The price and inventory of MAX4193CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4193CSA is usually 5 days.
3.What payment methods are accepted for MAX4193CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4193CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4193CSA?
MAX4193CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4193CSA 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?
For technical support, including MAX4193CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4193CSA requirements.
6.How does Aetrix verify that MAX4193CSA is sourced from the original manufacturer or authorized distributors?
All MAX4193CSA 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 meets industry standards.
7.What is the process for return or replacement of MAX4193CSA?
All MAX4193CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX4193CSA, 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 part is unused and in its original packaging.
Return procedure for MAX4193CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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