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Analog Devices Inc./Maxim Integrated MAX8888EZK21+T
- Part No.:
- MAX8888EZK21+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK21+T.pdf
- Description:
- IC REG LIN 2.1V 300MA TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,773
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Product details
Overview
MAX8888EZK21+T from Maxim Integrated is a low-dropout linear regulator delivering 300mA continuous output at 2.1V fixed voltage, operating from 2.5V–5.5V input with 100mV dropout at 200mA, featuring an open-drain power-OK (POK) flag and 55µA no-load quiescent current-designed for battery-powered portable electronics including wireless handsets and PDAs.
For engineers reviewing the MAX8888EZK21+T datasheet, MAX8888EZK21+T pinout, MAX8888EZK21+T application, or MAX8888EZK21+T equivalent, key selection criteria include guaranteed 300mA load capability, POK functionality for system power sequencing, thermal/short-circuit protection, and SOT23-5 footprint compatibility in space-constrained designs.
Technical Context
The MAX8888EZK21+T integrates a p-channel MOSFET pass transistor with 0.5Ω RDS(ON), enabling ultra-low quiescent current independent of load and eliminating base-drive losses typical of PNP-based regulators. Its internal 1.25V reference and error amplifier drive the pass element to maintain regulation across temperature and line/load variations.
It implements foldback current limiting (420mA trip at nominal VOUT, reduced under undervoltage), thermal shutdown at +170°C with 20°C hysteresis, and an open-drain POK output that asserts low when VOUT falls below 92.5% of 2.1V-enabling reliable power-on-reset signaling without external components beyond a 100kΩ pullup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.1V ±3% over -40°C to +85°C - ensures stable core voltage for 2.1V I/O domains or low-voltage microcontrollers. |
| Max Continuous Output Current | 300mA - supports moderate-power RF modules or display drivers without thermal derating at ambient ≤+70°C. |
| Dropout Voltage | 100mV at 200mA - enables operation down to 2.3V input, extending usable battery life in single-cell Li-ion or Li-poly systems. |
| Quiescent Current | 55µA at no load - minimizes standby power loss in always-on subsystems such as real-time clocks or sensor wake logic. |
| POK Threshold Accuracy | 92.5% of nominal VOUT (±2.5%) - provides precise undervoltage detection for deterministic system reset timing. |
| Shutdown Current | 0.1µA - reduces leakage to negligible levels during deep sleep modes, critical for multi-week battery runtime. |
| PSRR @ 1kHz | 40dB - suppresses switching noise from adjacent DC-DC converters, preserving analog signal integrity in mixed-signal SoCs. |
Pinout & Package
MAX8888EZK21+T is housed in a RoHS-compliant, thin-profile 5-pin SOT23 package (1mm height), optimized for high-density PCB layouts in handheld devices.
| 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, and internal circuitry; must be low-impedance for noise control. |
| 3: SHDN | Active-low enable control | Logic low disables regulator and forces OUT/POK low; pulled high to IN for normal operation; tolerates up to 6V. |
| 4: POK | Open-drain power-OK flag | Asserts low when VOUT < 92.5% of 2.1V; requires external 100kΩ pullup to OUT for logic-level interface with µC reset inputs. |
| 5: OUT | Regulated output | Delivers 2.1V at up to 300mA; bypassed with 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for stability and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Open-drain POK output | Enables direct interfacing with microcontroller reset pins without level-shifting; eliminates need for external supervisor IC in compact designs. |
| p-Channel MOSFET pass device | Eliminates base-drive current, maintaining 55µA quiescent current even at full 300mA load and in dropout condition. |
| Foldback current limiting | Reduces short-circuit current to ~500mA when VOUT drops below regulation, lowering power dissipation and improving fault survivability. |
| Thermal shutdown with hysteresis | Shuts down at +170°C junction temperature and re-enables only after cooling by 20°C, preventing thermal oscillation during sustained overload. |
| Low-noise compatible design | Supports optional BP pin (not used in MAX8888) for external noise filtering; POK functionality prioritized over ultra-low-noise mode in this variant. |
Applications
| Wireless Handsets | Notebook Computers |
|---|---|
|
Use Scenario: Powering RF transceiver bias rails and baseband processor I/O supplies in GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary LDO providing clean, sequenced 2.1V supply with POK confirmation before enabling RF front-end. Use Value: Ensures reliable power-up sequencing and prevents RF lock-up due to marginal VOUT, leveraging POK's 92.5% threshold and fast response. |
Use Scenario: Supplying 2.1V auxiliary rails for USB controller PHYs or embedded controller (EC) peripherals in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO delivering regulated voltage with thermal protection during peak CPU/GPU activity-induced board heating. Use Value: Maintains regulation under dynamic load steps while thermal shutdown prevents damage during sustained high-current bursts. |
| PDAs and Palmtop Computers | Digital Cameras |
|
Use Scenario: Powering image signal processor (ISP) core logic and memory interfaces in legacy PDA platforms. IC Role / Device Role / Timing Role: Low-quiescent LDO supplying 2.1V domain with shutdown control synchronized to host processor sleep states. Use Value: Achieves sub-1µA system standby current via 0.1µA shutdown mode, extending battery life between sync sessions. |
Use Scenario: Providing stable 2.1V supply to CMOS image sensor analog front-end and auto-focus motor drivers. IC Role / Device Role / Timing Role: Dedicated LDO ensuring noise-immune analog supply, with POK confirming readiness before image capture sequence initiation. Use Value: Prevents corrupted frame capture by gating exposure timing to POK assertion, avoiding sensor initialization errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS79521DCQ | 2.1V fixed output, 250mA rated, 170mV dropout at 200mA, no POK output | Lacks power-OK signaling; requires external supervisor for reset generation | Select when POK is unnecessary and lower cost is prioritized over full feature parity |
| MCP1702T-2102E/MB | 2.1V fixed output, 250mA rated, 600mV dropout at 250mA, 4µA quiescent current | Higher dropout limits usable battery range; no POK or thermal shutdown | Select for ultra-low IQ in low-current always-on nodes where POK and robust protection are not required |
Compared with TPS79521DCQ and MCP1702T-2102E/MB, the MAX8888EZK21+T uniquely combines 300mA capability, 100mV dropout, integrated POK, and full thermal/short-circuit protection in a 5-pin SOT23-making it optimal for space-constrained, battery-powered systems requiring autonomous power monitoring and fault resilience.
Availability
MAX8888EZK21+T is available at Aetrix Electronics and suitable for wireless handsets, notebook computers, PDAs, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK21+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 MAX8888EZK21+T belongs to Maxim's precision low-dropout linear regulator product line, engineered specifically for portable battery-powered equipment demanding low quiescent current, tight output accuracy, and integrated power-monitoring features like POK.
FAQ
What is the exact output voltage tolerance of the MAX8888EZK21+T over temperature?
The MAX8888EZK21+T delivers 2.1V output with ±3% accuracy over the full -40°C to +85°C operating temperature range, as specified in the Electrical Characteristics table under "Output Voltage Accuracy" with IOUT = 100µA to 300mA. This tolerance includes initial calibration, line regulation, and load regulation effects, ensuring consistent performance across environmental conditions without external trimming.
Does the MAX8888EZK21+T require an external capacitor on the BP pin?
No-the MAX8888EZK21+T does not use the BP (bypass) pin. That pin is present only on the MAX8887 variant for noise reduction; the MAX8888 replaces BP with the POK output. Therefore, the BP pin is unconnected on MAX8888EZK21+T, and no capacitor is needed or recommended for this device.
How does the POK output of the MAX8888EZK21+T behave during shutdown?
During shutdown (SHDN = GND), the MAX8888EZK21+T actively drives the POK pin low regardless of output voltage level. This behavior ensures deterministic reset signaling to downstream logic-even if the output capacitor retains residual charge-providing reliable power sequencing control in multi-rail systems.
What is the maximum allowable input voltage for the MAX8888EZK21+T?
The MAX8888EZK21+T supports an absolute maximum input voltage of +7V applied to the IN pin relative to GND, per the Absolute Maximum Ratings table. However, its functional operating range is limited to 2.5V–5.5V; operation above 5.5V may cause permanent damage or unpredictable regulation behavior.
Can the MAX8888EZK21+T be used with ceramic output capacitors having ESR above 0.1Ω?
No-using an output capacitor with ESR exceeding 0.1Ω risks instability and degraded transient response in the MAX8888EZK21+T. The datasheet explicitly specifies "COUT with ESR < 0.1Ω" for guaranteed stability; surface-mount X5R/X7R ceramics rated at 2.2µF/6.3V meet this requirement and are recommended for all designs.
MAX8888EZK21+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):
- 2.1V
- 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
MAX8888EZK21+T FAQ
1.How can I place an order for MAX8888EZK21+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK21+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 MAX8888EZK21+T reliable?
The price and inventory of MAX8888EZK21+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK21+T is usually 5 days.
3.What payment methods are accepted for MAX8888EZK21+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK21+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK21+T?
MAX8888EZK21+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK21+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 MAX8888EZK21+T?
For technical support, including MAX8888EZK21+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK21+T requirements.
6.How does Aetrix verify that MAX8888EZK21+T is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK21+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 MAX8888EZK21+T meets industry standards.
7.What is the process for return or replacement of MAX8888EZK21+T?
All MAX8888EZK21+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK21+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 MAX8888EZK21+T part is unused and in its original packaging.
Return procedure for MAX8888EZK21+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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