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Analog Devices Inc./Maxim Integrated MAX1818EUT15#G16
- Part No.:
- MAX1818EUT15#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1818EUT15#G16.pdf
- Description:
- IC REG LIN POS ADJ 500MA SOT6
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX1818EUT15#G16 from Maxim Integrated is a 500mA low-dropout linear regulator with preset 1.5V output, operating from +2.5V to +5.5V input, featuring ±1% output voltage accuracy, 120mV dropout at full load, and 125µA ground current - designed for power rail regulation in portable battery-powered systems such as PDAs and cellular handsets.
For engineers reviewing the MAX1818EUT15#G16 datasheet, MAX1818EUT15#G16 pinout, MAX1818EUT15#G16 application, or MAX1818EUT15#G16 equivalent, key selection criteria include guaranteed 500mA output under dropout conditions, active-low open-drain POK monitoring, 0.1µA shutdown current, thermal overload protection, and SOT23-6 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX1818EUT15#G16 integrates a P-channel MOSFET pass transistor (RDS(ON) ≈ 0.25Ω), 1.25V internal reference, error amplifier, and Dual Mode™ comparator that selects between preset (SET = GND) and adjustable (external resistor divider) output configurations. Its architecture eliminates base-drive current loss typical of PNP regulators, enabling stable 125µA quiescent current across load and temperature.
It delivers regulated 1.5V output with 93% VOUT(NOM) POK threshold, thermal shutdown at +170°C with 20°C hysteresis, and short-circuit current limiting (0.55–0.8A typ). The device operates within -40°C to +85°C ambient, supports 1µF input and 3.3µF low-ESR output capacitors, and requires no external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Preset 1.5V ±1% over -40°C to +85°C - ensures stable core logic or analog supply without external feedback components. |
| Max Output Current | 500mA RMS - sustains peak loads in handheld devices without thermal derating under typical board copper layout. |
| Dropout Voltage | 120mV at 500mA - enables operation down to VIN = 1.62V for 1.5V output, extending usable battery life in Li-ion and multi-cell alkaline systems. |
| Ground Current | 125µA at 500mA - remains constant vs. load, minimizing battery drain during active use and enabling accurate runtime estimation. |
| Shutdown Current | 0.1µA - reduces standby power to negligible levels, critical for always-on subsystems and real-time clock backup rails. |
| POK Threshold | 93% of nominal VOUT - provides early warning of input sag or regulator fault before system brownout, compatible with µC reset inputs. |
| Thermal Shutdown | +170°C with 20°C hysteresis - prevents permanent damage during sustained overload while allowing recovery once junction cools. |
Pinout & Package
The MAX1818EUT15#G16 is housed in a RoHS-compliant 6-pin SOT23 package (U6FH-6), rated for 800mW power dissipation at +70°C with 10mW/°C derating above that temperature. Thermal performance requires equal copper area sharing among IN, OUT, and GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN | Input supply connection | Accepts 2.5V–5.5V; bypassed with 1µF capacitor to GND for stability and noise rejection. |
| 2 - POK | Open-drain power-ok indicator | Pulls low when VOUT < 93% of 1.5V; requires external 100kΩ pull-up to OUT for logic-level signaling. |
| 3 - SHDN | Active-low enable control | Logic low disables regulator, reducing IQ to 0.1µA; tolerates up to +6V regardless of VIN/VOUT. |
| 4 - GND | Power and signal reference | Common return path for IN, OUT, SET, SHDN, and POK; must be low-impedance for thermal and noise performance. |
| 5 - SET | Mode-select and feedback node | Connected to GND for 1.5V preset mode; used with external resistors for adjustable outputs (1.25V–5.0V). |
| 6 - OUT | Regulated output terminal | Sources up to 500mA; bypassed with 3.3µF low-ESR capacitor (≤0.1Ω) to GND for transient response and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Output Selection | Factory-trimmed 1.5V output activated by grounding SET pin - eliminates external resistors and layout complexity for fixed-voltage applications. |
| P-Channel MOSFET Pass Element | 0.25Ω RDS(ON) - enables low dropout and eliminates base-drive current loss, maintaining 125µA ground current even at full 500mA load. |
| Power-OK (POK) Monitoring | Open-drain output asserting low below 1.4V (93% of 1.5V) - provides deterministic reset signaling to microcontrollers without external comparators. |
| Thermal Protection with Hysteresis | Shuts down at +170°C and re-enables at +150°C - prevents latch-up during continuous overload while permitting safe intermittent operation. |
| Low-Noise Operation | 115µVRMS output noise (10Hz–1MHz) with 3.3µF COUT - suitable for noise-sensitive analog circuits like ADC references and RF bias rails. |
Applications
| Cellular Handsets | Notebook Subsystem Rails |
|---|---|
Use Scenario: Regulating 1.5V supply for baseband processor I/O or memory interface in dual-mode GSM/UMTS handsets. IC Role / Device Role / Timing Role: Primary LDO delivering clean, low-noise 1.5V rail with fast load-transient response to handle burst-mode transmission current spikes. Use Value: 120mV dropout extends usable battery voltage range; 0.1µA shutdown current preserves charge during idle periods between calls. | Use Scenario: Powering USB controller logic or embedded controller (EC) in ultra-thin notebook platforms where board space is constrained. IC Role / Device Role / Timing Role: Compact, high-accuracy 1.5V LDO replacing larger TSSOP regulators to meet height and footprint requirements. Use Value: SOT23-6 footprint saves >60% board area vs. standard SO-8; ±1% accuracy ensures compliance with USB 2.0 I/O voltage tolerance (1.425V–1.575V). |
| Personal Digital Assistants (PDAs) | USB Hubs |
Use Scenario: Supplying 1.5V to touch-screen controller ASIC and flash memory interface in legacy PDA designs. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supporting always-on functions while enabling deep-sleep modes via SHDN control. Use Value: 125µA ground current minimizes impact on battery runtime; POK output synchronizes wake-up sequence with stable rail establishment. | Use Scenario: Generating 1.5V auxiliary rail for USB hub controller logic and port power management ICs. IC Role / Device Role / Timing Role: Secondary LDO providing isolated, monitored 1.5V supply independent of main 3.3V/5V rails. Use Value: POK signal validates rail integrity before enabling downstream USB port enumeration; thermal protection prevents failure during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS76315DBVR | Fixed 1.5V output, 150mA max, 120mV dropout at 150mA, 85µA IQ, SOT23-5 package | Limited to lower current; lacks POK output and thermal hysteresis | Use only where load ≤150mA and POK monitoring is unnecessary; smaller footprint but lower capability. |
| MCP1700T-1502E/TT | Fixed 1.5V output, 250mA max, 178mV dropout at 250mA, 1.6µA IQ, SOT23-3 package | No POK, no thermal shutdown, lower current rating, ultra-low IQ optimized for micropower | Select for micropower sensor nodes where 250mA suffices and fault monitoring is handled externally. |
Compared with the MAX1818EUT15#G16, the TPS76315DBVR offers reduced pin count but sacrifices 67% output current and critical system-monitoring features; the MCP1700T-1502E/TT trades off current capacity and protection for extreme quiescent current reduction - neither matches the integrated POK, thermal hysteresis, and 500mA capability of the MAX1818EUT15#G16 in compact portable designs.
Availability
The MAX1818EUT15#G16 is available at Aetrix Electronics and suitable for notebook computers, cellular handsets, PDAs, and USB hubs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1818EUT15#G16 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 MAX1818EUT15#G16 belongs to Maxim's low-dropout linear regulator product line, engineered specifically for battery-powered portable electronics demanding high accuracy, low quiescent current, and integrated fault monitoring in minimal footprints.
FAQ
What is the guaranteed output voltage accuracy of the MAX1818EUT15#G16 over temperature?
The MAX1818EUT15#G16 guarantees ±1% output voltage accuracy over the full operating temperature range of -40°C to +85°C at 100mA load, with ±2.5% specified across all loads (1mA–500mA) and temperatures. This ensures reliable 1.5V regulation for logic and analog circuits without external trimming.
Does the MAX1818EUT15#G16 require external capacitors, and what values are recommended?
Yes, the MAX1818EUT15#G16 requires a 1µF ceramic capacitor between IN and GND, and a 3.3µF low-ESR (≤0.1Ω) ceramic capacitor between OUT and GND for stable operation up to 500mA. For output voltages below 2V, a 4.7µF output capacitor is recommended - these values are validated in the MAX1818EUT15#G16 datasheet for phase margin and transient response.
How does the POK output function on the MAX1818EUT15#G16, and what external component is needed?
The POK output on the MAX1818EUT15#G16 is an open-drain N-channel driver that pulls low when VOUT falls below 93% of 1.5V (i.e., <1.4V). To generate a logic-high signal when regulation is valid, a 100kΩ pull-up resistor from POK to OUT is required - this configuration is explicitly validated in the MAX1818EUT15#G16 typical operating circuit.
What thermal protection behavior does the MAX1818EUT15#G16 exhibit during overload?
The MAX1818EUT15#G16 activates thermal shutdown at +170°C junction temperature and remains off until the die cools to +150°C (20°C hysteresis), resulting in pulsed output during continuous overload. This behavior is documented in the MAX1818EUT15#G16 electrical characteristics table and protects against permanent damage without requiring external thermal management.
Can the MAX1818EUT15#G16 be used in adjustable-output mode, and how is it configured?
Yes, the MAX1818EUT15#G16 supports adjustable output from 1.25V to 5.0V by disconnecting SET from GND and connecting it to a resistive divider between OUT and GND. With VSET = 1.25V, R2 is selected between 25kΩ and 100kΩ, and R1 calculated as R1 = R2 × ((VOUT/1.25) – 1) - this Dual Mode™ configuration is fully specified for the MAX1818EUT15#G16 in the datasheet.
MAX1818EUT15#G16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.25V (1.5V)
- Voltage - Output (Max):
- 5V
- Voltage Dropout (Max):
- -
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 250 µA
- Current - Supply (Max):
- 140 µA
- PSRR:
- -
- 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:
- SOT-6
MAX1818EUT15#G16 FAQ
1.How can I place an order for MAX1818EUT15#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1818EUT15#G16 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 MAX1818EUT15#G16 reliable?
The price and inventory of MAX1818EUT15#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1818EUT15#G16 is usually 5 days.
3.What payment methods are accepted for MAX1818EUT15#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1818EUT15#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1818EUT15#G16?
MAX1818EUT15#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1818EUT15#G16 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 MAX1818EUT15#G16?
For technical support, including MAX1818EUT15#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1818EUT15#G16 requirements.
6.How does Aetrix verify that MAX1818EUT15#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1818EUT15#G16 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 MAX1818EUT15#G16 meets industry standards.
7.What is the process for return or replacement of MAX1818EUT15#G16?
All MAX1818EUT15#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1818EUT15#G16, 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 MAX1818EUT15#G16 part is unused and in its original packaging.
Return procedure for MAX1818EUT15#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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