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Analog Devices Inc./Maxim Integrated MAX8888EZK19+T
- Part No.:
- MAX8888EZK19+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK19+T.pdf
- Description:
- IC REG LIN 1.9V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,626
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Product details
Overview
MAX8888EZK19+T from Maxim Integrated is a low-dropout linear regulator delivering up to 300mA continuous output at a fixed 1.9V output voltage, operating from 2.5V to 5.5V input, with 100mV dropout at 200mA, 55µA no-load supply current, and an active-low open-drain POK flag for power-good monitoring - used in battery-powered wireless handsets and portable instrumentation.
For engineers reviewing the MAX8888EZK19+T datasheet, MAX8888EZK19+T pinout, MAX8888EZK19+T application, or MAX8888EZK19+T equivalent, key selection criteria include guaranteed 300mA load capability, 1.9V preset output accuracy (±3%), thermal/short-circuit protection, SOT23-5 package compatibility, and POK assertion at 92.5% VOUT for system reset sequencing.
Technical Context
The MAX8888EZK19+T integrates a p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling low dropout and load-independent 55µA quiescent current. Its error amplifier compares feedback from an internal resistor divider against a 1.25V reference to regulate output.
It features foldback current limiting (420mA typical at nominal VOUT, reduced under undervoltage), thermal shutdown at +170°C with 20°C hysteresis, and a dedicated open-drain POK output that asserts low when VOUT falls below 92.5% of 1.9V - requiring external pullup for logic-level signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.9V ±3% over -40°C to +85°C and 100µA–300mA load - ensures stable core voltage for 1.8V–1.9V logic rails. |
| Max Continuous Output Current | 300mA guaranteed - supports baseband processors or RF front-end ICs in handheld devices. |
| Dropout Voltage | 100mV at 200mA load - extends usable battery life down to ~2.0V input in single-cell Li-ion systems. |
| Quiescent Supply Current | 55µA at no load - minimizes standby power loss in always-on subsystems. |
| POK Threshold Accuracy | 92.5% of nominal VOUT (±2.5%) - provides reliable power-fail detection for microcontroller reset timing. |
| Shutdown Current | 0.1µA max - enables deep-sleep modes without compromising system wake-up latency. |
| PSRR @ 1kHz | 40dB - suppresses switching noise from adjacent DC-DC converters feeding the LDO input. |
Pinout & Package
MAX8888EZK19+T is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for space-constrained portable PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass capacitor to GND for stability and transient response. |
| 2 - GND | Ground reference | Common return path for input/output capacitors and internal circuitry; must be low-impedance. |
| 3 - SHDN | Active-low enable control | Pulled low to enter 0.1µA shutdown; pulled high (≥1.6V) to enable regulation; tolerates up to 6V. |
| 4 - POK | Open-drain power-good flag | Drives low when VOUT < 92.5% of 1.9V; requires external pullup (e.g., 100kΩ to OUT) for logic interface. |
| 5 - OUT | Regulated output | Delivers 1.9V at up to 300mA; bypassed with 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND. |
Key Features
| Feature | Design Value |
|---|---|
| p-Channel MOSFET pass element | Eliminates base-drive current, enabling 55µA quiescent current independent of load - critical for battery runtime. |
| Foldback current limiting | Reduces current limit to 500mA pulsed (420mA typical) when VOUT drops below 93%, protecting during brownout. |
| Thermal shutdown with hysteresis | Shuts down at +170°C junction temperature and re-enables after cooling by 20°C - prevents latch-up during overload. |
| Open-drain POK with precise threshold | Asserts low at 92.5% of 1.9V (±2.5%) - enables accurate POR generation for µC initialization without external comparators. |
| Stable with low-ESR ceramic capacitors | Guaranteed stability with 2.2µF output cap (ESR ≤ 0.1Ω) - eliminates need for tantalum or aluminum electrolytics. |
Applications
| Wireless Handsets | Digital Cameras |
|---|---|
|
Use Scenario: Powering RF transceiver bias circuits and baseband processor I/O banks in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary 1.9V LDO supplying noise-sensitive analog sections while rejecting PMIC switching noise. Use Value: 40dB PSRR at 1kHz and 100mV dropout extend talk time and maintain signal integrity during battery discharge. |
Use Scenario: Providing clean 1.9V supply to image sensor interface logic and flash memory controllers. IC Role / Device Role / Timing Role: Low-noise, fast-transient LDO ensuring stable voltage during burst-mode image capture and write cycles. Use Value: 55µA quiescent current and 0.1µA shutdown minimize standby drain; POK signals valid power to sensor initialization firmware. |
| PDAs and Palmtop Computers | Hand-Held Instruments |
|
Use Scenario: Regulating 1.9V for ARM-based application processors and touch controller ASICs. IC Role / Device Role / Timing Role: System-level voltage supervisor with integrated POK, replacing discrete reset IC + LDO combinations. Use Value: Single-SOT23 solution reduces BOM count and PCB area; thermal protection prevents failure during extended CPU load. |
Use Scenario: Powering precision ADC front-ends and microcontroller peripherals in portable multimeters and data loggers. IC Role / Device Role / Timing Role: High-accuracy, low-drift LDO maintaining 1.9V reference stability across temperature (-40°C to +85°C). Use Value: ±3% output accuracy and <0.1% line/load regulation ensure measurement repeatability; POK validates supply before sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6219B192MR-G | Same 1.9V output, 300mA rating, SOT23-5, but lacks POK output and has higher 120mV dropout at 200mA. | No built-in power-good signaling - requires external reset IC for POR functionality. | Select when POK is unnecessary and lowest possible cost is prioritized over system-level supervision. |
| Diodes Inc. AP2112K-1.9TRG1 | 1.9V, 600mA rated, SOT23-5, includes EN pin but no POK; 110mV dropout at 300mA; 65µA IQ. | Higher current headroom but no voltage-valid flag - unsuitable for safety-critical power sequencing. | Choose when future-proofing for higher loads is needed, and POK can be implemented externally. |
Compared with MAX8888EZK19+T, the XC6219B192MR-G omits critical system supervision (POK), while the AP2112K-1.9TRG1 trades POK for higher current capacity - making MAX8888EZK19+T uniquely suited for compact, self-monitoring 1.9V rail designs.
Availability
MAX8888EZK19+T is available at Aetrix Electronics and suitable for wireless handsets, digital cameras, PDAs, and hand-held instruments requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK19+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 MAX8888EZK19+T belongs to Maxim's ultra-low-quiescent-current LDO family, designed specifically for battery-powered portable electronics where runtime, small size, and integrated supervision are essential.
FAQ
What is the output voltage tolerance of the MAX8888EZK19+T over temperature and load?
The MAX8888EZK19+T guarantees ±3% output voltage accuracy across the full -40°C to +85°C operating temperature range and for load currents from 100µA to 300mA. This specification is confirmed in the Electrical Characteristics table of the official datasheet, ensuring reliable 1.9V regulation in portable equipment under real-world thermal and loading conditions. The MAX8888EZK19+T maintains this accuracy without external trimming components.
Does the MAX8888EZK19+T require an external bypass capacitor on the BP pin?
No - the MAX8888EZK19+T does not include a BP (bypass) pin. Unlike the MAX8887 variant, which uses BP for noise filtering, the MAX8888EZK19+T replaces BP with the POK pin. Therefore, no BP capacitor is needed or supported. The MAX8888EZK19+T relies on its 2.2µF output capacitor and internal design for stability and noise performance.
Can the POK output of the MAX8888EZK19+T drive a microcontroller reset pin directly?
Yes - the POK output of the MAX8888EZK19+T is an open-drain n-channel output that can be pulled up to the microcontroller's VDD (e.g., to OUT or another regulated rail) using a 100kΩ resistor. When VOUT is within 92.5%–100% of 1.9V, POK floats high; it pulls low during undervoltage. This provides a direct, logic-compatible reset signal without additional level-shifting circuitry. The MAX8888EZK19+T datasheet confirms VOL ≤ 0.1V at 1mA sink.
What is the maximum allowable input voltage for the MAX8888EZK19+T?
The absolute maximum input voltage for the MAX8888EZK19+T is +7V referenced to GND, per the Absolute Maximum Ratings table. However, the recommended operating input voltage range is 2.5V to 5.5V. Exceeding 5.5V risks violating functional specifications and may trigger internal protection circuits. The MAX8888EZK19+T is designed for single-cell Li-ion (up to 4.2V) and dual-cell alkaline/NiMH (up to 3.2V) inputs - not for 12V or higher rails.
How does the MAX8888EZK19+T behave during thermal shutdown?
When the junction temperature of the MAX8888EZK19+T exceeds +170°C, thermal shutdown disables the pass transistor, dropping output current to near zero. After the die cools by 20°C (to ~150°C), the device automatically resumes regulation. This hysteresis prevents oscillation and allows safe recovery. During sustained overload, the MAX8888EZK19+T enters pulsed operation - a known behavior documented in the Thermal Protection section of the datasheet.
MAX8888EZK19+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.9V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 100 µA
- Current - Supply (Max):
- 65 µA
- PSRR:
- 40dB (1kHz)
- Control Features:
- Enable, Power Good
- 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
MAX8888EZK19+T FAQ
1.How can I place an order for MAX8888EZK19+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK19+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 MAX8888EZK19+T reliable?
The price and inventory of MAX8888EZK19+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK19+T is usually 5 days.
3.What payment methods are accepted for MAX8888EZK19+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK19+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK19+T?
MAX8888EZK19+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK19+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 MAX8888EZK19+T?
For technical support, including MAX8888EZK19+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK19+T requirements.
6.How does Aetrix verify that MAX8888EZK19+T is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK19+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 MAX8888EZK19+T meets industry standards.
7.What is the process for return or replacement of MAX8888EZK19+T?
All MAX8888EZK19+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK19+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 MAX8888EZK19+T part is unused and in its original packaging.
Return procedure for MAX8888EZK19+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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