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Analog Devices Inc./Maxim Integrated MAX8877EUK18
- Part No.:
- MAX8877EUK18
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX8877EUK18.pdf
- Description:
- IC REG LINEAR LDO
- Quantity:
- Payment:
- Shipping:
Inventory:1,572
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Product details
Overview
MAX8877EUK18 from Maxim Integrated is a low-noise, low-dropout linear regulator with 1.8V preset output, 150mA max output current, 165mV dropout at full load, 30µVRMS output noise, and 100µA operating supply current. It uses an internal P-channel MOSFET pass device and operates from 2.5V to 6.5V input, serving as a precision voltage source in battery-powered portable electronics.
For engineers reviewing the MAX8877EUK18 datasheet, MAX8877EUK18 pinout, MAX8877EUK18 application, or MAX8877EUK18 equivalent, key selection criteria include its 1.8V fixed output accuracy (±1.4%), ultra-low shutdown current (10nA), reverse battery protection, thermal shutdown at +155°C, and SOT23-5 regular package compatibility with industry-standard '2982 footprint.
Technical Context
The MAX8877EUK18 employs a 1.25V bandgap reference and error amplifier driving a 1.1Ω typical P-channel MOSFET pass transistor, enabling stable regulation without base-drive current penalties. Its BP pin integrates a 200kΩ resistor with external 0.01µF capacitor to form an 80Hz low-pass filter for noise reduction.
Shutdown is active-low on SHDN pin, reducing supply current to 10nA; the MAX8877EUK18 lacks auto-discharge (unlike MAX8878), so output remains floating during shutdown. Protection includes thermal shutdown with 15°C hysteresis, short-circuit current limiting (160–390mA), and reverse battery protection limiting reverse current to 1mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.80V ±1.4% - factory-preset, stable across -40°C to +85°C and 0.1–120mA load. |
| Max Output Current | 150mA - supports microcontroller cores, RF front-ends, and sensor interfaces in compact portable designs. |
| Dropout Voltage | 165mV at 150mA - enables operation down to VIN = 1.965V, extending usable battery life in single-cell Li-ion or alkaline systems. |
| Output Noise | 30µVRMS (10Hz–100kHz) - achieved with 0.01µF BP capacitor; suitable for noise-sensitive analog/RF circuitry. |
| Quiescent Current | 100µA over full load and dropout range - ensures minimal battery drain during active operation. |
| Shutdown Current | 10nA - reduces system standby power to negligible levels; logic-controlled via SHDN pin. |
| Input Voltage Range | 2.5V to 6.5V - compatible with single-cell Li-ion (2.7–4.2V), dual-cell alkaline (3–6V), and regulated intermediate rails. |
Pinout & Package
MAX8877EUK18 is housed in a 5-pin SOT23-5 regular package (JEDEC MO-178AA), with exposed pad not electrically connected. The GND pin serves dual role as circuit ground and thermal path; soldering to a large PCB copper area improves power dissipation capability (θJB = 140°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Regulator input | Accepts 2.5–6.5V; requires ≥1µF ceramic bypass to GND for stability and line-transient suppression. |
| 2 GND | Ground reference & thermal sink | Electrical return path and primary heat conduction route; must connect to large PCB ground plane. |
| 3 SHDN | Active-low enable control | Pull low to enter 10nA shutdown; pull high (≥2.0V) or tie to IN for normal operation. |
| 4 BP | Bypass reference node | Connects to 0.01µF ceramic capacitor to reduce reference noise; determines output noise floor and startup time. |
| 5 OUT | Regulated output | Delivers up to 150mA at 1.8V; requires ≥1µF ceramic capacitor (ESR < 0.2Ω) for VOUT ≥ 2.5V; 3.3µF for lower outputs. |
Key Features
| Feature | Design Value |
|---|---|
| P-channel MOSFET pass element | Eliminates base-drive current loss; maintains 100µA quiescent current regardless of load or dropout condition. |
| Reverse battery protection | Blocks reverse current to ≤1mA when VIN or SHDN falls below GND, preventing damage in miswired battery compartments. |
| Thermal shutdown with hysteresis | Shuts down at +155°C junction temperature and re-enables only after cooling by 15°C, enabling safe pulsed operation under overload. |
| 1.8V ±1.4% output accuracy | Guaranteed over -40°C to +85°C and 0.1–120mA load, ensuring reliable core voltage for 1.8V logic and memory interfaces. |
| '2982 pin-compatible footprint | Direct replacement for legacy regulators in existing layouts; no PCB redesign required for drop-in upgrade. |
Applications
| Cellular Handset Power Rail | PCMCIA Card LDO Supply |
|---|---|
|
Use Scenario: Powers baseband processor I/O or RF transceiver bias in GSM/EDGE handsets using single-cell Li-ion battery. IC Role / Device Role / Timing Role: Primary 1.8V LDO delivering clean, stable voltage with fast load transient response to handle burst-mode transmission current spikes. Use Value: 30µVRMS noise and 12mV load-step deviation ensure signal integrity in sensitive RF sections; 165mV dropout extends talk time by ~15 minutes before brownout. |
Use Scenario: Supplies 1.8V logic interface for PCMCIA Type II cards inserted into laptops or industrial hosts. IC Role / Device Role / Timing Role: Local point-of-load regulator isolating card logic from noisy host 3.3V rail while meeting PCMCIA hot-swap voltage ramp requirements. Use Value: 10nA shutdown current enables zero-power card retention during host sleep; reverse battery protection prevents damage during hot insertion/removal. |
| Palmtop Computer Core Voltage | Electronic Planner Memory Supply |
|
Use Scenario: Provides 1.8V core voltage to ARM7-based application processor in handheld PDAs with limited PCB area. IC Role / Device Role / Timing Role: Low-quiescent-current LDO maintaining tight regulation during dynamic CPU frequency scaling and deep-sleep states. Use Value: 100µA operating IQ minimizes idle power draw; SOT23-5 footprint fits tight board real estate; ±1.4% accuracy ensures reliable boot and memory access. |
Use Scenario: Powers SRAM and real-time clock (RTC) backup circuits in battery-operated electronic organizers. IC Role / Device Role / Timing Role: Precision low-noise regulator sustaining volatile memory and timekeeping during main battery depletion or replacement. Use Value: 30µVRMS noise prevents bit errors in low-voltage SRAM; reverse battery protection safeguards RTC during battery swap; 1.8V matches modern low-power memory specs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-noise LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76318DBVR | Higher 220mV dropout at 150mA; 50µVRMS noise; 85µA IQ; same SOT23-5 package. | Lacks reverse battery protection and thermal hysteresis; requires external shutdown pull-up. | Choose if cost sensitivity outweighs noise and protection requirements; verify thermal margin at full load. |
| MCP1700T-1802E/TT | Lower 175mV dropout at 250mA; 30µVRMS noise; 1.6µA IQ; SOT23-3 package (no SHDN/BP pins). | No shutdown or BP pin; fixed 1.8V output but no reverse protection or thermal hysteresis. | Use where ultra-low IQ dominates and shutdown/BP features are unnecessary; requires layout change due to 3-pin footprint. |
Compared with MAX8877EUK18, TPS76318DBVR trades higher noise and dropout for broader distributor availability, while MCP1700T-1802E/TT sacrifices protection and control flexibility for extreme quiescent current savings-neither offers the integrated BP noise filtering and reverse-battery robustness of the MAX8877EUK18.
Availability
MAX8877EUK18 is available at Aetrix Electronics and suitable for cellular telephones, PCMCIA cards, palmtop computers, and electronic planners requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across industrial temperature range.
Supply support for MAX8877EUK18 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 MAX8877/MAX8878 product line was designed specifically for battery-powered portable electronics demanding ultra-low noise, low dropout, and robust protection-targeting space-constrained, long-runtime devices where reliability and efficiency are critical.
FAQ
What is the output voltage tolerance of MAX8877EUK18 over temperature and load?
The MAX8877EUK18 guarantees ±1.4% output voltage accuracy over -40°C to +85°C ambient temperature and 0.1mA to 120mA load current. At +25°C and 0.1mA load, the tolerance tightens to ±1.4% (not ±1.0%). This specification ensures reliable operation of 1.8V logic interfaces across full industrial conditions without external trimming.
Does MAX8877EUK18 include auto-discharge functionality during shutdown?
No, MAX8877EUK18 does not include auto-discharge. That feature is exclusive to the MAX8878 family (e.g., MAX8878EUK18). When MAX8877EUK18 enters shutdown via the SHDN pin, the output floats and retains its voltage until discharged by external circuitry or load leakage. This behavior is confirmed in the Functional Diagram and Pin Description sections of the datasheet.
What capacitor values are required for stable operation of MAX8877EUK18?
For stable operation, MAX8877EUK18 requires a minimum 1µF ceramic input capacitor (CIN) and a 1µF ceramic output capacitor (COUT) with ESR < 0.2Ω for VOUT ≥ 2.5V. Since MAX8877EUK18 is a 1.8V device, the datasheet specifies a 3.3µF COUT. A 0.01µF ceramic capacitor must be placed on the BP pin to achieve 30µVRMS noise performance.
How does the P-channel MOSFET pass transistor in MAX8877EUK18 improve efficiency?
The internal P-channel MOSFET in MAX8877EUK18 eliminates base-drive current losses inherent in PNP-based LDOs. This allows MAX8877EUK18 to maintain a constant 100µA supply current across all load conditions-including dropout-whereas PNP regulators exhibit rising IQ under heavy load or low VIN. The result is longer battery runtime in portable applications.
Is MAX8877EUK18 pin-compatible with the industry-standard '2982 regulator?
Yes, MAX8877EUK18 is explicitly designed as pin-compatible with the industry-standard '2982 family. Its SOT23-5 regular package matches the pinout (IN, GND, SHDN, BP, OUT), allowing direct replacement without PCB modification. This compatibility is stated in the General Description and confirmed in the Pin Configuration diagram and Ordering Information tables.
MAX8877EUK18 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.165V @ 150mA (Typ)
- Current - Output:
- 150mA
- Current - Quiescent (Iq):
- 180 µA
- Current - Supply (Max):
- 100 µA
- PSRR:
- -
- 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
MAX8877EUK18 FAQ
1.How can I place an order for MAX8877EUK18 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8877EUK18 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 MAX8877EUK18 reliable?
The price and inventory of MAX8877EUK18 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8877EUK18 is usually 5 days.
3.What payment methods are accepted for MAX8877EUK18?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8877EUK18 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8877EUK18?
MAX8877EUK18 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8877EUK18 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 MAX8877EUK18?
For technical support, including MAX8877EUK18 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8877EUK18 requirements.
6.How does Aetrix verify that MAX8877EUK18 is sourced from the original manufacturer or authorized distributors?
All MAX8877EUK18 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 MAX8877EUK18 meets industry standards.
7.What is the process for return or replacement of MAX8877EUK18?
All MAX8877EUK18 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8877EUK18, 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 MAX8877EUK18 part is unused and in its original packaging.
Return procedure for MAX8877EUK18:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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