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Analog Devices Inc./Maxim Integrated MAX1658ESA
- Part No.:
- MAX1658ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX1658ESA.pdf
- Description:
- IC REG LIN POS ADJ 350MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,654
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Product details
Overview
MAX1658ESA from Maxim Integrated is a 3.3V fixed-output, 350mA low-dropout linear regulator with p-channel MOSFET pass transistor, 650mV dropout at 350mA, 30μA quiescent current, and -40°C to +85°C operating range. It delivers stable power to battery-powered portable electronics requiring ultra-low supply current and reverse-battery protection.
For engineers reviewing the MAX1658ESA datasheet, MAX1658ESA pinout, MAX1658ESA application, or MAX1658ESA equivalent, key selection criteria include its Dual Mode™ output configuration (fixed 3.3V), thermal shutdown at 165°C, 1.2W SO package power dissipation, and compatibility with 10μF low-ESR output capacitors for load-transient stability.
Technical Context
The MAX1658ESA uses an internal 1.21V reference and error amplifier to regulate output by controlling a p-channel MOSFET pass transistor. Its Dual Mode™ comparator monitors the SET pin voltage against a 65mV threshold to select between internal fixed-voltage feedback (3.3V) or external adjustable feedback (1.25V–16V).
Thermal overload protection deactivates the pass transistor above 165°C junction temperature with 10°C hysteresis, while reverse-battery protection disconnects the substrate when VIN falls below GND (down to -17V). Shutdown mode draws ≤1μA and exits in 120μs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±3% (guaranteed over -40°C to +85°C, 0–350mA load) |
| Max Output Current | 350mA continuous - supports compact handheld devices without external current boosting |
| Dropout Voltage | 650mV typical at 350mA - enables operation down to VIN = 3.95V while maintaining regulation |
| Quiescent Current | 30μA typical at no load - extends battery life in always-on standby circuits |
| Shutdown Current | ≤1μA - meets ultra-low-power system sleep requirements |
| Input Voltage Range | 2.7V to 16.5V - accommodates single-cell Li-ion up to multi-cell alkaline or wall adapters |
| PSRR | 55dB at 50Hz/60Hz - suppresses AC ripple from unregulated wall-cube supplies |
Pinout & Package
MAX1658ESA is housed in an 8-pin SO (Small Outline) package rated for 1.2W continuous power dissipation (derated above +70°C), featuring IN pins (3,6,7) as dual-function electrical inputs and thermal heatsinks - requires connection to copper plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SET) | Output-Voltage Selection Input | Grounding selects fixed 3.3V mode; floating or resistive divider enables adjustable output (1.25V–16V) |
| 2 (SHDN) | Active-Low Shutdown Control | Pulling ≤0.4V disables regulator and reduces supply current to ≤1μA; exit time is 120μs |
| 3,6,7 (IN) | Unregulated Input Supply | Accepts 2.7V–16.5V; multiple pins serve as thermal conduction paths to PCB copper |
| 4,5 (OUT) | Regulated Output | Delivers up to 350mA at 3.3V; requires ≥10μF low-ESR capacitor to ground for stability |
| 8 (GND) | Power Ground Reference | Common return path for input, output, and internal circuitry; must be low-impedance |
Key Features
| Feature | Design Value |
|---|---|
| Dual Mode™ Operation | Hardware-selectable fixed 3.3V or adjustable output (1.25V–16V) via single SET pin logic state |
| p-Channel MOSFET Pass Transistor | Enables constant low quiescent current across full load range (0–350mA), including dropout |
| Reverse-Battery Protection | Withstands -17V input without damage - critical for consumer battery compartments prone to misinsertion |
| Thermal Shutdown with Hysteresis | Deactivates at 165°C junction temp; re-enables after 10°C cooldown - prevents thermal runaway in sealed enclosures |
| Current Limit Protection | 900mA foldback limit - allows indefinite short-circuit survival without external fusing |
Applications
| Digital Cordless Phones | PCMCIA Cards |
|---|---|
Use Scenario: Powering RF front-end ICs and baseband processors in compact cordless handsets with single Li-ion cell. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying core logic and analog sections under dynamic load transients. Use Value: 650mV dropout ensures regulation until battery discharges to ~3.95V; 2.5mVP-P noise avoids RF desensitization. |
Use Scenario: Providing regulated 3.3V to memory and interface controllers in hot-pluggable PCMCIA Type II cards. IC Role / Device Role / Timing Role: System power rail regulator with reverse-battery protection to prevent damage during card insertion/removal. Use Value: -17V reverse-input tolerance eliminates need for series diode; 1μA shutdown enables host-controlled power gating. |
| Cellular Phones | Hand-Held Instruments |
Use Scenario: Supplying 3.3V to display drivers and sensor interfaces in early GSM feature phones with tight board space. IC Role / Device Role / Timing Role: Compact, high-efficiency LDO replacing discrete solutions in multi-rail battery-powered systems. Use Value: 8-pin SO package with integrated thermal design (θJB = 69°C/W) sustains 350mA without external heatsink. |
Use Scenario: Powering precision ADCs and microcontrollers in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage source for analog signal chains requiring stable reference rails. Use Value: 30μA quiescent current extends battery life beyond 100 hours; PSRR >55dB rejects switching supply coupling. |
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 |
|---|---|---|---|
| TPS76333QDBVRQ1 | 3.3V fixed, 150mA max output, 220mV dropout at 150mA, 85μA IQ, SOT-23-5 package | Lower current capability and smaller footprint - suitable only for sub-150mA loads | Select when board space is constrained and load current remains ≤150mA; not drop-in due to pin count and current limit mismatch |
| MCP1702T-3302E/MB | 3.3V fixed, 250mA max output, 600mV dropout at 250mA, 4μA IQ, SOT-23-5 package | Ultra-low quiescent current but lower max current and no reverse-battery protection | Prefer for ultra-long-life battery applications with ≤250mA loads; omit if reverse-polarity risk exists in end-use environment |
Compared with MAX1658ESA, TPS76333QDBVRQ1 offers smaller size but insufficient current for 350mA loads, while MCP1702T-3302E/MB trades off reverse-battery protection and thermal robustness for extreme quiescent current reduction - neither matches the MAX1658ESA's combination of 350mA delivery, 650mV dropout, and -17V reverse tolerance in an 8-pin SO package.
Availability
MAX1658ESA is available at Aetrix Electronics and suitable for digital cordless phones, PCMCIA cards, and handheld instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1658ESA 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) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX1658ESA belongs to Maxim's micropower LDO regulator family engineered for battery longevity in portable electronics - emphasizing ultra-low IQ, reverse-battery resilience, and thermal robustness in compact packages.
FAQ
What is the guaranteed output voltage tolerance for MAX1658ESA over temperature?
The MAX1658ESA guarantees a 3.3V output within ±3% (3.20V to 3.40V) across its full -40°C to +85°C operating range, with typical value of 3.30V at +25°C. This specification is production-tested and applies to loads from 0mA to 350mA with input voltage between 5V and 16.5V.
Does MAX1658ESA require an external capacitor on the SET pin for fixed-output operation?
No, the MAX1658ESA does not require an external capacitor on the SET pin for fixed 3.3V operation. Connecting SET directly to GND selects the internal feedback network; adding capacitance is unnecessary and may degrade transient response. External RC networks are only needed for adjustable configurations.
Can MAX1658ESA safely operate with input voltage below 2.7V?
No - the MAX1658ESA is not specified to operate below 2.7V input. Below this threshold, regulation is not guaranteed, dropout behavior becomes unpredictable, and internal circuitry (including the 1.21V reference and error amplifier) may cease functioning. Absolute minimum IN-to-GND rating is -17V, but functional operation requires ≥2.7V.
What is the maximum allowable power dissipation for MAX1658ESA at +85°C ambient?
At +85°C ambient, the MAX1658ESA's maximum power dissipation is derated from 1.2W (at +70°C) by 14.5mW/°C, resulting in 1.2W − (14.5mW × 15°C) = 982.5mW. This assumes proper PCB thermal design with IN pins connected to ≥1 in² copper area per Figure 4 in the datasheet.
Is MAX1658ESA compatible with ceramic output capacitors?
Yes, the MAX1658ESA is stable with ceramic output capacitors ≥10μF and ESR <200mΩ. However, low-ESR ceramics may reduce phase margin; the datasheet recommends verifying stability with actual layout and load conditions. Tantalum capacitors are preferred for guaranteed stability across all operating points.
MAX1658ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable (Fixed)
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 1.25V (3.3V)
- Voltage - Output (Max):
- 16V
- Voltage Dropout (Max):
- 1.5V @ 350mA
- Current - Output:
- 350mA
- Current - Quiescent (Iq):
- 60 µA
- Current - Supply (Max):
- -
- PSRR:
- -
- Control Features:
- Enable
- Protection Features:
- Over Current, Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX1658ESA FAQ
1.How can I place an order for MAX1658ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1658ESA 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 MAX1658ESA reliable?
The price and inventory of MAX1658ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1658ESA is usually 5 days.
3.What payment methods are accepted for MAX1658ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1658ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1658ESA?
MAX1658ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1658ESA 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 MAX1658ESA?
For technical support, including MAX1658ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1658ESA requirements.
6.How does Aetrix verify that MAX1658ESA is sourced from the original manufacturer or authorized distributors?
All MAX1658ESA 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 MAX1658ESA meets industry standards.
7.What is the process for return or replacement of MAX1658ESA?
All MAX1658ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1658ESA, 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 MAX1658ESA part is unused and in its original packaging.
Return procedure for MAX1658ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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