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Analog Devices Inc./Maxim Integrated MAX1598EZK4A
- Part No.:
- MAX1598EZK4A
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX1598EZK4A.pdf
- Description:
- LOW-NOISE, LOW-DROPOUT, 200MA, L
- Quantity:
- Payment:
- Shipping:
Inventory:315
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Product details
Overview
MAX1598EZK4A from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 4.0V output, delivering up to 200mA from 2.5V–6.5V input. It features 30µVRMS output noise, 236mV dropout at 200mA, 100µA operating supply current independent of load or dropout, and integrated reverse-battery protection. It serves as a stable power source for battery-powered handheld instruments and PCMCIA cards.
For engineers reviewing the MAX1598EZK4A datasheet, MAX1598EZK4A pinout, MAX1598EZK4A application, or MAX1598EZK4A equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative regulators with documented functional and application-level differences.
Technical Context
The MAX1598EZK4A uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) enabling ultra-low quiescent current (100µA) across all operating conditions - including dropout, light-load, and full 200mA load. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to the OUT pin.
Noise reduction is implemented via a dedicated BP pin with external 0.01µF capacitor forming an 80Hz low-pass filter; thermal shutdown activates at +155°C with 15°C hysteresis, and autodischarge actively pulls OUT to GND during shutdown via a 300Ω internal discharge path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 4.0V ±3% over -40°C to +85°C - eliminates external feedback resistors and ensures stable rail for 3.3V/4.0V logic interfaces. |
| Max Output Current | 200mA continuous - sufficient to power baseband processors, RF front-ends, or multi-function sensor subsystems in portable devices. |
| Dropout Voltage | 236mV at 200mA - enables operation down to 4.236V input when regulating 4.0V, extending usable battery life in single-cell Li-ion systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) with 0.01µF BP cap - meets stringent analog/RF supply requirements without additional filtering. |
| Quiescent Current | 100µA at full load and in dropout - maintains efficiency during deep discharge and enables >1-year shelf life in always-on monitoring applications. |
| Shutdown Current | 10nA logic-controlled shutdown - reduces system standby power to negligible levels, critical for battery-backed real-time clocks or memory retention. |
| Protection Features | Reverse-battery protection (≤1mA reverse current), thermal shutdown (+155°C), short-circuit tolerance, and output current limit (220–458mA) - eliminates need for external protection circuitry. |
Pinout & Package
Package: Thin SOT23-5 (1.6mm × 1.6mm × 0.95mm), thermally enhanced with GND pin serving as heatsink - requires soldering to PCB ground plane for rated 727mW dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5V–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 GND | Power and thermal ground | Electrical return path and primary heat conduction path - must connect to large copper area for thermal management. |
| 3 SHDN | Active-low enable control | Logic-low ≤0.4V disables regulator and initiates 300µs exit delay; internal 10nA bias enables direct microcontroller GPIO drive. |
| 4 BP | Bypass for reference noise | Connects to 0.01µF ceramic cap to reduce output noise spectral density; larger values increase startup time without benefit. |
| 5 OUT | Regulated output | Delivers up to 200mA; requires 2.2µF ceramic cap (ESR <0.2Ω) for stability across temperature and load range. |
Key Features
| Feature | Design Value |
|---|---|
| Autodischarge function | 300Ω internal discharge path actively pulls OUT to GND during SHDN - prevents floating voltage on downstream circuitry and eliminates need for external bleed resistor. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) enables constant 100µA IQ regardless of load or input voltage - delivers 3× longer battery runtime vs. PNP-based LDOs under dropout. |
| Reverse battery protection | Limits reverse current to ≤1mA when IN or SHDN falls below GND - protects IC and system from damage during incorrect battery insertion in field-replaceable modules. |
| Thermal hysteresis | +155°C trip with 15°C hysteresis - ensures clean latching behavior during overload, preventing oscillation and enabling safe intermittent operation in confined enclosures. |
| Low-noise BP architecture | Internal 200kΩ resistor + external 0.01µF BP cap forms 80Hz filter - reduces high-frequency reference noise before error amplifier, achieving 30µVRMS without post-regulation LC stages. |
Applications
| Hand-Held Instruments | PCMCIA Cards |
|---|---|
|
Use Scenario: Portable multimeter or data logger powered by single Li-ion cell with dynamic load switching between display, ADC, and wireless transmission. IC Role / Device Role / Timing Role: Primary 4.0V analog/digital supply regulator with low noise and fast transient response to maintain measurement accuracy during mode changes. Use Value: 30µVRMS noise ensures sub-LSB ADC performance; 236mV dropout extends usable battery range to 4.236V, adding ~12% operational time vs. higher-dropout alternatives. |
Use Scenario: Hot-pluggable PCMCIA modem card requiring immediate power stabilization upon insertion, with strict EMI and leakage constraints. IC Role / Device Role / Timing Role: Standby and active-mode LDO supplying 4.0V to UART, PHY, and flash memory - enabled via host-side SHDN signal. Use Value: 10nA shutdown current prevents parasitic drain on host battery; autodischarge clears residual voltage before card removal, avoiding bus contention. |
| Electronic Planners | Modems |
|
Use Scenario: Battery-backed PDA with persistent SRAM and real-time clock, requiring ultra-low quiescent current during sleep and clean wake-up sequencing. IC Role / Device Role / Timing Role: Always-on 4.0V supply for memory retention and RTC subsystem - maintained during main CPU shutdown via dedicated SHDN control. Use Value: 100µA operating IQ and 10nA shutdown IQ enable multi-year battery life; reverse-battery protection safeguards against user-insertion errors. |
Use Scenario: Embedded V.92 dial-up modem in industrial gateway, exposed to wide ambient temperature swings and unregulated AC adapter input. IC Role / Device Role / Timing Role: Post-regulator for DSP core and analog front-end - rejects ripple from upstream switching supply and stabilizes during line surges. Use Value: 63dB PSRR at low frequencies suppresses adapter noise; thermal shutdown + hysteresis prevents latch-up during sustained high-temp operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise, low-dropout LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76340DBVR | Fixed 4.0V output, 150mA max, 120mV dropout at 150mA, 85µA IQ, no BP pin or autodischarge. | Lacks BP noise filtering and active discharge - requires external RC network for shutdown discharge; unsuitable for noise-sensitive RF sections. | Select when board space is constrained and noise <50µVRMS is acceptable; verify thermal margin at 200mA load. |
| MCP1703T-4002E/MB | Fixed 4.0V output, 250mA max, 600mV dropout at 250mA, 4µA IQ, no reverse-battery protection or thermal hysteresis. | Higher dropout limits usable input range; no reverse-polarity safeguard - mandates external diode or FET protection in field-deployed units. | Prefer for ultra-low-IQ battery maintenance; avoid in high-temperature or mechanically reversible battery environments. |
Compared with MAX1598EZK4A, TPS76340DBVR offers lower dropout but lacks noise optimization and autodischarge, while MCP1703T-4002E/MB trades higher dropout and no reverse protection for nanoamp IQ - making MAX1598EZK4A optimal where noise, safety, and controlled shutdown are co-priorities.
Availability
MAX1598EZK4A is available at Aetrix Electronics and suitable for hand-held instruments, PCMCIA cards, electronic planners, modems, and cellular phone subsystems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX1598EZK4A 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX1598 series was developed specifically for battery-powered portable electronics requiring ultra-low noise, minimal quiescent current, and robust fault protection - targeting handheld test equipment, mobile computing peripherals, and telecom interface modules.
FAQ
What is the exact output voltage of MAX1598EZK4A?
The MAX1598EZK4A has a factory-preset output voltage of 4.0V with ±3% accuracy over the full operating temperature range (-40°C to +85°C). This value is fixed internally via laser-trimmed resistors and does not require external feedback components. The '4A' suffix explicitly denotes the 4.0V variant per Maxim's Selector Guide, and the output remains stable within specification across 0.1mA–200mA load currents and input voltages from 2.5V to 6.5V.
Does MAX1598EZK4A support active output discharge during shutdown?
Yes, MAX1598EZK4A includes an integrated autodischarge function that actively pulls the OUT pin to GND through a 300Ω internal path when SHDN is asserted. This eliminates residual voltage on downstream circuitry, prevents unintended wake-up events, and removes the need for external bleed resistors. The discharge occurs automatically upon entry to shutdown mode and completes within microseconds - a feature confirmed in the Functional Diagram and Pin Description sections of the official datasheet.
What is the minimum input voltage required for MAX1598EZK4A to regulate 4.0V at 200mA?
The minimum input voltage for MAX1598EZK4A to maintain 4.0V regulation at 200mA is 4.236V, based on its typical dropout voltage of 236mV at that load. This value is measured as VIN – VOUT under specified conditions and allows the device to operate effectively near end-of-life in single-cell Li-ion systems (nominal 3.7V, fully charged 4.2V). Input voltage must remain ≥2.5V for basic functionality, but regulation at full 4.0V output requires VIN ≥ (VOUT + dropout).
Can MAX1598EZK4A be used with ceramic output capacitors?
Yes, MAX1598EZK4A is fully compatible with ceramic output capacitors. The datasheet specifies a minimum 2.2µF X7R or X5R ceramic capacitor (ESR <0.2Ω) for stable operation across -40°C to +85°C and up to 200mA load. Larger values (up to 10µF) improve load-transient response and PSRR. Avoid Z5U/Y5V dielectrics below -10°C unless capacitance is doubled, as their ESR and value drift can compromise stability.
How does MAX1598EZK4A provide reverse-battery protection?
MAX1598EZK4A implements reverse-battery protection by monitoring polarity at both IN and SHDN pins; if either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA. This prevents damage during incorrect battery installation in consumer or industrial handheld devices. Unlike discrete diode solutions, this integrated scheme adds zero forward voltage drop or quiescent current penalty in normal operation - a feature explicitly verified in the Absolute Maximum Ratings and Applications Information sections.
MAX1598EZK4A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.236V @ 200mA
- Current - Output:
- 200mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- Control Features:
- Shutdown
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
MAX1598EZK4A FAQ
1.How can I place an order for MAX1598EZK4A through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1598EZK4A 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 MAX1598EZK4A reliable?
The price and inventory of MAX1598EZK4A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1598EZK4A is usually 5 days.
3.What payment methods are accepted for MAX1598EZK4A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1598EZK4A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1598EZK4A?
MAX1598EZK4A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1598EZK4A 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 MAX1598EZK4A?
For technical support, including MAX1598EZK4A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1598EZK4A requirements.
6.How does Aetrix verify that MAX1598EZK4A is sourced from the original manufacturer or authorized distributors?
All MAX1598EZK4A 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 MAX1598EZK4A meets industry standards.
7.What is the process for return or replacement of MAX1598EZK4A?
All MAX1598EZK4A units undergo pre-shipment inspection (PSI). If there is an issue with MAX1598EZK4A, 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 MAX1598EZK4A part is unused and in its original packaging.
Return procedure for MAX1598EZK4A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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