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Analog Devices Inc./Maxim Integrated MAX8888EZK29
- Part No.:
- MAX8888EZK29
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
MAX8888EZK29.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
MAX8888EZK29 from Maxim Integrated is a fixed-output 2.9V, 300mA low-dropout linear regulator with open-drain POK flag, designed for battery-powered systems requiring stable voltage under varying load and input conditions. It operates from 2.5V to 5.5V input, delivers ≤100mV dropout at 200mA, consumes only 55µA quiescent current, and features thermal shutdown, short-circuit protection, and foldback current limiting - used in wireless handsets and notebook computers.
For engineers reviewing the MAX8888EZK29 datasheet, MAX8888EZK29 pinout, MAX8888EZK29 application, or MAX8888EZK29 equivalent, key selection criteria include guaranteed 2.9V output accuracy (±3%), POK assertion at 92.5% VOUT, 0.1µA shutdown current, SOT23-5 package compatibility, and absence of BP pin - critical for power sequencing and POR signaling in portable electronics.
Technical Context
The MAX8888EZK29 integrates a P-channel MOSFET pass transistor (RDS(ON) ≈ 0.5Ω) enabling low dropout and load-independent 55µA ground current. Its error amplifier compares feedback against a 1.25V internal reference, with factory-trimmed resistive divider setting 2.9V output.
POK functionality uses an independent comparator monitoring VOUT against 92.5% of nominal (2.6825V), with 1% hysteresis and open-drain N-channel output. Shutdown control is active-low, with VIH = 1.6V and VIL = 0.6V, allowing direct interface to 1.8V/3.3V logic without level shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 2.9V ±3% over -40°C to +85°C and 100µA–300mA load - ensures stable core voltage for 2.8V–3.0V logic rails. |
| Max Continuous Output Current | 300mA guaranteed - supports baseband processors or RF transceivers in handheld devices. |
| Dropout Voltage | 100mV at 200mA load - extends usable battery life down to ~3.0V input for Li-ion cells. |
| Quiescent Current | 55µA at no load - minimizes standby drain in always-on subsystems like RTC or sensor hubs. |
| POK Threshold | 92.5% of VOUT (2.6825V) with 1% hysteresis - provides clean power-good assertion for microcontroller reset timing. |
| Shutdown Current | 0.1µA max - enables ultra-low-power deep-sleep modes in portable equipment. |
| PSRR @ 1kHz | 40dB - suppresses switching noise from DC-DC converters feeding the LDO input. |
Pinout & Package
MAX8888EZK29 is housed in a lead-free, thin-profile 5-pin SOT23 package (1mm height), compatible with standard SOT23-5 PCB footprints and reflow processes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; requires 2.2µF ceramic bypass to GND for stability and transient response. |
| 2 - GND | Power ground reference | Low-impedance return path for regulator current and POK sink; must be connected directly to system ground plane. |
| 3 - SHDN | Active-low enable control | Pulled low to disable regulator and reduce supply current to ≤0.1µA; tied to IN for always-on operation. |
| 4 - POK | Open-drain power-good flag | Sinks current when VOUT < 2.6825V; requires external pullup (e.g., 100kΩ to OUT) for logic-level signaling to µC reset pin. |
| 5 - OUT | Regulated output | Delivers up to 300mA at 2.9V; requires 2.2µF ceramic capacitor (ESR < 0.1Ω) to GND for loop stability. |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.9V output | Eliminates external feedback resistors, reducing BOM count and layout area in space-constrained designs. |
| Open-drain POK with 1% hysteresis | Enables reliable power-on reset generation without additional comparators or RC timing networks. |
| 55µA ground current (load-independent) | Maintains ultra-low quiescent consumption even at full 300mA load - critical for battery runtime optimization. |
| Foldback current limiting | Reduces output current to 500mA (pulsed) or 420mA (continuous) during overload, lowering thermal stress during fault conditions. |
| Thermal shutdown at 170°C | Prevents permanent damage during sustained overload or poor heatsinking; auto-recovery with 20°C hysteresis. |
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 2.9V LDO delivering regulated voltage with fast load-transient response to handle burst-mode transmission currents. Use Value: 100mV dropout enables operation down to 3.0V input, extending talk time from partially discharged Li-ion cells. |
Use Scenario: Supplying 2.9V to USB controller or display interface ICs in ultraportable notebooks. IC Role / Device Role / Timing Role: Secondary LDO providing clean, low-noise voltage derived from main 3.3V rail, with POK signaling system readiness to firmware. Use Value: 40dB PSRR at 1kHz attenuates noise from nearby switching regulators, preventing data corruption on high-speed interfaces. |
| PDAs and Palmtop Computers | Digital Cameras |
|
Use Scenario: Powering image signal processor (ISP) core logic and memory interfaces in handheld PDAs. IC Role / Device Role / Timing Role: Low-quiescent LDO maintaining stable 2.9V during sleep/wake cycles, with POK synchronized to system boot sequence. Use Value: 0.1µA shutdown current minimizes battery drain during extended idle periods without compromising wake-up latency. |
Use Scenario: Supplying 2.9V to CMOS image sensor analog front-end and autofocus motor drivers. IC Role / Device Role / Timing Role: High-accuracy LDO ensuring consistent sensor bias voltage across temperature, with POK confirming valid power before frame capture. Use Value: ±3% output accuracy prevents gain drift and color channel imbalance in raw image data under thermal variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Torex XC6206P292MR | 2.9V fixed output, 300mA, 150mV dropout at 200mA, no POK output, 1µA shutdown current | Lacks power-good signaling; requires external reset IC for POR functionality | Select when POK is unnecessary and lowest possible shutdown current is not required |
| Analog Devices ADP121-AUJZ-2.9-R7 | 2.9V fixed output, 150mA max, 135mV dropout at 150mA, no POK, 30µA quiescent current | Lower current rating and no POK; smaller footprint but insufficient for 300mA loads | Select only for lower-power subsystems where 150mA suffices and board space is constrained |
Compared with XC6206P292MR and ADP121-AUJZ-2.9-R7, the MAX8888EZK29 uniquely combines 300mA capability, 100mV dropout, and integrated POK in SOT23-5 - making it the only drop-in solution for applications requiring coordinated power sequencing and high-current analog rail regulation.
Availability
MAX8888EZK29 is available at Aetrix Electronics and suitable for wireless handsets, notebook computers, and digital cameras requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8888EZK29 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8887/MAX8888 product line was designed specifically for portable battery-powered equipment - emphasizing ultra-low quiescent current, small SOT23-5 footprint, and integrated power-good signaling to simplify power architecture in space- and energy-constrained devices.
FAQ
What is the output voltage tolerance of the MAX8888EZK29 over temperature and load?
The MAX8888EZK29 guarantees ±3% output voltage accuracy over the full -40°C to +85°C operating temperature range and for load currents from 100µA to 300mA. At +25°C and 100mA load, typical deviation is ±1.2%. This tight tolerance ensures reliable operation of 2.9V-tolerant logic and analog circuits without external trimming.
Does the MAX8888EZK29 require an external BP (bypass) capacitor?
No, the MAX8888EZK29 does not use a BP pin - that pin is present only on the MAX8887 variant for noise reduction. The MAX8888EZK29 omits BP, simplifying layout and eliminating the need for a 0.01µF ceramic capacitor. This reflects its design focus on power-good signaling rather than ultra-low-noise operation.
What is the minimum input voltage required for regulation at full 300mA load?
At 300mA load, the MAX8888EZK29 requires VIN ≥ VOUT + VDROPOUT. With a typical dropout of 150mV at 300mA (per datasheet Table "Dropout Voltage"), the minimum input is 2.9V + 0.15V = 3.05V. For guaranteed regulation across process and temperature, design for ≥3.1V input under worst-case conditions.
How does the POK output behave during shutdown of the MAX8888EZK29?
During shutdown (SHDN = GND), the MAX8888EZK29 drives POK low regardless of output voltage state. This behavior ensures deterministic reset signaling - the microcontroller receives a known low state during power-down, avoiding floating or spurious reset pulses that could corrupt firmware state.
Can the MAX8888EZK29 be used with ceramic output capacitors less than 2.2µF?
No - the MAX8888EZK29 requires a minimum 2.2µF ceramic output capacitor with ESR < 0.1Ω for guaranteed stability. Using smaller values risks oscillation or degraded transient response. The datasheet explicitly specifies 2.2µF as the minimum for all operating conditions, including dropout and full-load scenarios.
MAX8888EZK29 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):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.9V
- 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
MAX8888EZK29 FAQ
1.How can I place an order for MAX8888EZK29 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8888EZK29 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 MAX8888EZK29 reliable?
The price and inventory of MAX8888EZK29 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8888EZK29 is usually 5 days.
3.What payment methods are accepted for MAX8888EZK29?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8888EZK29 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8888EZK29?
MAX8888EZK29 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8888EZK29 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 MAX8888EZK29?
For technical support, including MAX8888EZK29 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8888EZK29 requirements.
6.How does Aetrix verify that MAX8888EZK29 is sourced from the original manufacturer or authorized distributors?
All MAX8888EZK29 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 MAX8888EZK29 meets industry standards.
7.What is the process for return or replacement of MAX8888EZK29?
All MAX8888EZK29 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8888EZK29, 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 MAX8888EZK29 part is unused and in its original packaging.
Return procedure for MAX8888EZK29:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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