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Analog Devices Inc./Maxim Integrated MAX8868EUK32+T
- Part No.:
- MAX8868EUK32+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8868EUK32+T.pdf
- Description:
- IC REG LIN 3.15V 150MA SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,137
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Product details
Overview
MAX8868EUK32+T from Maxim Integrated is a low-noise, low-dropout linear regulator with preset 3.15V output, 150mA output current capability, 30µVRMS output noise, and 165mV dropout at full load - designed for battery-powered portable electronics requiring stable, clean power under light-to-moderate load conditions.
For engineers reviewing the MAX8868EUK32+T datasheet, MAX8868EUK32+T pinout, MAX8868EUK32+T application, or MAX8868EUK32+T equivalent, key selection criteria include its auto-discharge function, reverse battery protection, thermal shutdown behavior, and SOT23-5 package compatibility with MAX8863/64 family designs.
Technical Context
The MAX8868EUK32+T uses an internal P-channel MOSFET pass transistor (1.1Ω typical RDS(ON)) to achieve low quiescent current (100µA) independent of load or dropout condition. Its error amplifier compares a 1.25V bandgap reference against feedback from an internal resistor divider tied to OUT.
Unlike the MAX8867, the MAX8868EUK32+T integrates active auto-discharge via SHDN assertion, pulling OUT to GND through a 300Ω internal discharge path. It also includes reverse battery protection limiting reverse current to 1mA when VIN or SHDN falls below GND.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.15V ±1.4% - factory-preset, fixed-output LDO eliminating external feedback resistors. |
| Max Output Current | 150mA - supports moderate-power analog/digital loads without external current boosting. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 3.315V while maintaining regulation. |
| Output Noise | 30µVRMS (10Hz–100kHz) - ultra-low noise critical for RF, ADC, and precision analog circuits. |
| Quiescent Current | 100µA - constant across load and dropout, extending battery life in always-on systems. |
| Shutdown Current | 10nA - near-zero leakage during system sleep, enabling long-term storage without battery drain. |
| Auto-Discharge | 300Ω internal path - actively discharges output capacitor to GND within microseconds of SHDN assertion. |
Pinout & Package
SOT23-5 regular package (JEDEC MO-178AA), 5-pin surface-mount with exposed pad not electrically connected; GND pin serves dual role as electrical ground and thermal heatsink - requires soldering to large copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low enable/discharge control | Logic low disables regulator and activates MAX8868-specific auto-discharge; connect to IN for always-on operation. |
| 2 - GND | Ground reference and thermal path | Primary return path for all currents; must be connected to PCB ground plane for thermal dissipation and noise control. |
| 3 - IN | Input voltage supply | Accepts 2.5V–6.5V input; requires ≥1µF ceramic bypass capacitor to GND for stability and line-transient suppression. |
| 4 - OUT | Regulated output | Delivers up to 150mA at 3.15V; requires ≥1µF low-ESR ceramic capacitor to GND for load-transient response and stability. |
| 5 - BP | Noise-reduction bypass node | Connects to 0.01µF ceramic capacitor to reduce output noise; forms 80Hz RC filter with internal 200kΩ resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Auto-discharge on shutdown | 300Ω internal discharge path pulls OUT to GND rapidly - eliminates residual voltage that could cause latch-up or unintended wake-up. |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN < GND - prevents damage during incorrect battery insertion or hot-swap events. |
| P-channel MOSFET pass element | 1.1Ω typical RDS(ON) - eliminates base-drive current loss, enabling stable 100µA IQ across all operating conditions including dropout. |
| Thermal shutdown with hysteresis | Triggers at +155°C (TSHDN) with +15°C hysteresis - cycles ON/OFF during overload to prevent permanent damage without requiring external reset. |
| Low-noise BP pin architecture | Internal 200kΩ resistor + external 0.01µF capacitor creates dedicated noise-filtering path - reduces output noise by >50% vs. standard LDOs. |
Applications
| Cellular Telephones | Hand-Held Instruments |
|---|---|
Use Scenario: Powering RF transceiver bias rails and baseband analog sections in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Primary 3.15V LDO supplying low-noise VCC to PLLs, VCOs, and ADC front-ends. Use Value: 30µVRMS noise ensures minimal phase jitter in RF synthesizers; auto-discharge prevents residual charge from interfering with fast power cycling. |
Use Scenario: Regulating power for microcontroller peripherals and sensor signal chains in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Fixed-output LDO delivering clean 3.15V to precision op-amps and 16-bit ADCs. Use Value: ±1.4% output accuracy and low load regulation (0.01%/mA) maintain measurement integrity across battery discharge; 100µA IQ extends runtime between charges. |
| PCMCIA Cards | Palmtop Computers |
Use Scenario: Providing isolated 3.15V supply for PCMCIA card logic and interface circuitry during hot insertion. IC Role / Device Role / Timing Role: Hot-swap-capable LDO with reverse battery protection and fast shutdown exit (<300µs). Use Value: Reverse protection prevents damage from misaligned card insertion; 10nA shutdown current avoids parasitic drain on host system batteries. |
Use Scenario: Supplying core logic voltage to ARM-based palmtop SoCs and display drivers during dynamic voltage scaling. IC Role / Device Role / Timing Role: Secondary LDO supporting I/O or memory subsystems where noise and fast transient response are critical. Use Value: 12mV load transient overshoot (0→50mA step) and 63dB PSRR at low frequencies suppress coupling from digital switching noise into sensitive analog domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8867EUK32+T | No auto-discharge; identical pinout, output voltage, and noise specs; same 10nA shutdown current. | Lacks active output discharge - unsuitable where residual voltage must be cleared during shutdown. | Select when auto-discharge is unnecessary and cost minimization is prioritized. |
| TCS2113-3.15V | Higher 50µVRMS noise; 200mV dropout at 150mA; no reverse battery protection; 250µA quiescent current. | Lower integration - requires external protection diodes and lacks BP noise filtering. | Choose only if footprint compatibility is secondary and higher noise/leakage is acceptable. |
Compared with MAX8867EUK32+T, the MAX8868EUK32+T adds essential auto-discharge for safe power sequencing in multi-rail systems; versus TCS2113-3.15V, it delivers superior noise, efficiency, and integrated protection - making it optimal for space-constrained, battery-sensitive designs.
Availability
MAX8868EUK32+T is available at Aetrix Electronics and suitable for cellular telephones, handheld instruments, PCMCIA cards, and palmtop computers requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX8868EUK32+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 fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX8867/MAX8868 product line was engineered specifically for battery-powered portable electronics demanding ultra-low noise, low quiescent current, and robust fault protection in minimal SOT23-5 footprint.
FAQ
What is the exact output voltage of the MAX8868EUK32+T?
The MAX8868EUK32+T has a factory-preset output voltage of 3.15V with ±1.4% accuracy over temperature and load. This value is encoded in the "32" suffix per Maxim's expanded ordering table and confirmed in the Electrical Characteristics section under Output Voltage Accuracy. The MAX8868EUK32+T does not support adjustable output - it is a fixed-voltage device requiring no external resistors.
Does the MAX8868EUK32+T include auto-discharge functionality, and how does it work?
Yes, the MAX8868EUK32+T includes auto-discharge: when SHDN is pulled low, an internal 300Ω switch connects OUT to GND, actively discharging output capacitance. This feature is exclusive to the MAX8868 variant (not present in MAX8867). The discharge path operates independently of external components and is verified in the Electrical Characteristics table under "Shutdown Discharge Resistance".
What are the required external capacitors for stable operation of the MAX8868EUK32+T?
The MAX8868EUK32+T requires three external capacitors: 1µF ceramic on IN (to GND), 1–10µF ceramic on OUT (to GND), and 0.01µF ceramic on BP (to GND). The BP capacitor is mandatory for achieving the specified 30µVRMS noise. COUT ESR must remain below 0.2Ω (typical) - X7R/X5R dielectrics are recommended; Z5U/Y5V may require ≥2.2µF for low-temperature stability.
How does reverse battery protection operate in the MAX8868EUK32+T?
The MAX8868EUK32+T monitors polarity on both IN and SHDN pins. If either falls below GND, internal circuitry disconnects parasitic paths and limits reverse current to ≤1mA - preventing damage during incorrect battery installation or hot-swap events. This behavior is documented in the Absolute Maximum Ratings and Applications Information sections, and confirmed in the Pin Description for IN and SHDN.
Is the MAX8868EUK32+T pin-compatible with other regulators in the MAX886x family?
Yes, the MAX8868EUK32+T is pin-compatible with MAX8867EUK32+T, MAX8863, and MAX8864 in SOT23-5 packages - sharing identical IN, GND, OUT, SHDN, and BP pin assignments. The sole functional difference is the BP pin's role: MAX8868 uses it for auto-discharge activation during shutdown, whereas MAX8867 uses it solely for noise reduction.
MAX8868EUK32+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 3.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- 63dB (10kHz)
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX8868EUK32+T FAQ
1.How can I place an order for MAX8868EUK32+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8868EUK32+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 MAX8868EUK32+T reliable?
The price and inventory of MAX8868EUK32+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8868EUK32+T is usually 5 days.
3.What payment methods are accepted for MAX8868EUK32+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8868EUK32+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8868EUK32+T?
MAX8868EUK32+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8868EUK32+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 MAX8868EUK32+T?
For technical support, including MAX8868EUK32+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8868EUK32+T requirements.
6.How does Aetrix verify that MAX8868EUK32+T is sourced from the original manufacturer or authorized distributors?
All MAX8868EUK32+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 MAX8868EUK32+T meets industry standards.
7.What is the process for return or replacement of MAX8868EUK32+T?
All MAX8868EUK32+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8868EUK32+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 MAX8868EUK32+T part is unused and in its original packaging.
Return procedure for MAX8868EUK32+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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