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Analog Devices Inc./Maxim Integrated MAX1686HEUA+
- Part No.:
- MAX1686HEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1686HEUA+.pdf
- Description:
- IC REG CHARG PUMP SIM 1OUT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:140
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Product details
Overview
MAX1686HEUA+ from Maxim Integrated is a 5.0V-regulated charge-pump IC designed to power 5V SIM cards in GSM/PCS handsets and portable POS terminals. It accepts 2.7V–4.2V input, delivers ≥12mA output current, features 45µA quiescent supply current (reduced to 3µA when powering 3V SIM cards), and integrates an input-output shorting switch for 3V mode operation.
For engineers reviewing the MAX1686HEUA+ datasheet, MAX1686HEUA+ pinout, MAX1686HEUA+ application, or MAX1686HEUA+ equivalent, key selection criteria include regulated 5.0V output accuracy (±5%), ultra-low shutdown current (<0.1µA), soft-start current limiting, and compatibility with minimal external components (0.047µF, 0.1µF, 2.2µF ceramic capacitors).
Technical Context
The MAX1686HEUA+ implements a 1MHz skip-mode charge pump with internal 1.23V bandgap reference and error amplifier to regulate output at 5.00V ±5% in 5V mode (3/5 = GND). Its dual-mode architecture supports both 5V regulation and direct IN-to-OUT pass-through (2.5Ω on-resistance) in 3V mode (3/5 = IN).
Control logic includes undervoltage lockout (1.2V threshold), active output discharge during shutdown, and short-circuit protection. Soft-start limits inrush current to ≤200mA and progressively reduces S2 switch on-resistance from 50Ω to <10Ω as VOUT rises above VIN/2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.00V ±5% (regulated in 5V mode); enables compliance with ISO/IEC 7816-3 5V SIM card voltage requirements. |
| Input Voltage Range | 2.7V to 4.2V; matches Li-ion battery operating range in handheld devices without requiring pre-regulation. |
| Output Current | ≥12mA min; sufficient to drive full-load 5V SIM cards per ISO/IEC 7816-3 Class A timing and current profiles. |
| Quiescent Current | 45µA (enabled, no load); extends battery life in standby by minimizing idle power draw. |
| Shutdown Current | <0.1µA; ensures negligible battery drain when SIM slot is unoccupied or card is inactive. |
| Charge-Pump Frequency | 1MHz (700–1300kHz over temp); enables use of small 0.047µF flying capacitor and reduces EMI vs. lower-frequency pumps. |
| Soft-Start Limit | ≤200mA peak inrush; prevents input voltage sag and avoids triggering host system brownout detection. |
Pinout & Package
MAX1686HEUA+ is housed in an 8-pin µMAX package (2.1mm × 3.0mm × 1.0mm height), optimized for space-constrained SIM card slots in mobile handsets.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - 3/5 | Mode Select Input | Logic-controlled selection between 5V regulation (GND) and 3V pass-through (IN); determines SIM card voltage class support. |
| 2 - SHDN | Active-Low Shutdown | Pulls OUT to GND and disables oscillator/reference when low; enables zero-power SIM slot management. |
| 3 - IN | Power Input | Accepts 2.7V–4.2V battery supply; bypassed with 0.1µF ceramic capacitor to suppress switching noise. |
| 4 - GND | Analog Ground | Reference node for error amplifier and bandgap; must be star-connected to PGND near device. |
| 5 - PGND | Power Ground | High-current return path for charge pump switches; requires low-impedance trace to GND. |
| 6 - CXN | Charge-Pump Negative | Connects to negative terminal of 0.047µF flying capacitor; critical for charge transfer efficiency. |
| 7 - CXP | Charge-Pump Positive | Connects to positive terminal of 0.047µF flying capacitor; forms pumping node with CXN. |
| 8 - OUT | Regulated Output | Delivers 5.00V to SIM VCC; bypassed with 2.2µF ceramic capacitor to meet ISO/IEC 7816-3 ripple limits. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Mode SIM Power | Hardware-selectable 5V regulation (for legacy SIMs) or 3V pass-through (for modern SIMs), eliminating need for external mode-switching circuitry. |
| Ultra-Low Quiescent Current | 45µA typical in active 5V mode enables >1000-hour standby on single-cell Li-ion battery in GSM phones. |
| Integrated Output Discharge | Internal N-channel FET actively pulls OUT to GND during shutdown, ensuring safe SIM card insertion/removal without voltage glitches. |
| Soft-Start Current Limiting | 200mA peak inrush control prevents input rail collapse during power-up, maintaining stable baseband processor operation. |
| Small External Component Count | Only three ceramic capacitors required (0.047µF, 0.1µF, 2.2µF), reducing BOM cost and PCB area vs. LDO-based solutions. |
Applications
| GSM Cellular Handset SIM Slot | Portable POS Terminal |
|---|---|
Use Scenario: Powering 5V SIM cards in dual-mode GSM handsets where battery voltage varies from 2.7V (discharged) to 4.2V (fully charged). IC Role / Device Role / Timing Role: Regulated 5.0V charge-pump power supply with hardware mode select (3/5 pin) and active shutdown discharge. Use Value: Maintains stable 5V SIM VCC across full battery range while consuming only 45µA quiescent current-extending talk time by up to 12 minutes per 100mAh battery capacity. | Use Scenario: Enabling hot-swappable SIM card support in compact handheld payment terminals powered by rechargeable Li-ion batteries. IC Role / Device Role / Timing Role: Dual-voltage SIM power manager supporting both 3V and 5V cards via single 3/5 control pin and integrated IN-OUT shorting switch. Use Value: Eliminates need for separate 3V/5V SIM power rails and external MOSFETs, reducing component count by 4 parts and saving 3.5mm² PCB area. |
| PCS Phone Baseband Module | Personal Communicator SIM Interface |
Use Scenario: Providing regulated 5V SIM supply in PCS-band handsets with tight thermal constraints and limited board space near antenna modules. IC Role / Device Role / Timing Role: High-efficiency 1MHz charge pump with 1mm-profile µMAX package and minimal thermal dissipation (330mW max). Use Value: Delivers 12mA at 5V with <150mW typical power loss, avoiding localized heating that could degrade RF performance near sensitive analog sections. | Use Scenario: Supporting multi-SIM functionality in early personal communicators requiring independent voltage control per SIM slot. IC Role / Device Role / Timing Role: Single-chip SIM power solution with hardware-selectable output mode and fast start-up (<1.5ms to 5V under 500Ω load). Use Value: Enables rapid SIM enumeration during boot sequence-meeting 200ms power-on timing budget for dual-SIM initialization in communication stacks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SIM card power supply applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1686EUA+ | 4.75V nominal output (±5%) instead of 5.00V; identical pinout, package, and feature set. | Targeted at newer SIM cards compliant with 4.75V–5.25V range; slightly lower output reduces current drain on older cards. | Select MAX1686EUA+ when prioritizing lowest possible SIM card current consumption in battery-sensitive designs. |
| TPS60230RGTR | Fixed 5.0V output, 1.2MHz switching frequency, 25µA quiescent current, but requires four external capacitors and lacks 3V pass-through mode. | Designed for general-purpose 5V charge-pump applications-not optimized for SIM-specific dual-mode operation or ultra-low shutdown current. | Choose TPS60230RGTR only if 3V SIM support is unnecessary and lowest quiescent current is secondary to higher efficiency at mid-load. |
Compared with MAX1686EUA+ and TPS60230RGTR, the MAX1686HEUA+ uniquely combines precise 5.00V regulation, hardware-selectable 3V/5V operation, sub-0.1µA shutdown current, and three-capacitor simplicity-making it the optimal choice for dual-voltage SIM interfaces in space- and battery-constrained portable systems.
Availability
MAX1686HEUA+ is available at Aetrix Electronics and suitable for GSM cellular phones, portable POS terminals, and personal communicators requiring stable component supply with guaranteed long-term availability.
Supply support for MAX1686HEUA+ 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 and mixed-signal ICs for power management, interface, and sensing applications.
The MAX1686H product line was engineered specifically for dual-voltage SIM card power delivery in portable wireless devices, addressing the need for compact, low-quiescent-current, and mode-flexible solutions compliant with ISO/IEC 7816-3.
FAQ
What is the output voltage tolerance of the MAX1686HEUA+ in 5V mode?
The MAX1686HEUA+ delivers a regulated 5.00V output in 5V mode (3/5 = GND) with a tolerance of ±5%, corresponding to 4.75V to 5.25V across temperature and load. This meets ISO/IEC 7816-3 Class A SIM card voltage specifications and ensures reliable card operation even at minimum input voltage (2.7V) and maximum load (12mA). The MAX1686HEUA+ uses an internal 1.23V bandgap reference and precision resistive feedback network to maintain this accuracy.
How does the MAX1686HEUA+ support both 3V and 5V SIM cards?
The MAX1686HEUA+ supports both 3V and 5V SIM cards through its dedicated 3/5 pin: when pulled low (GND), it activates the 5V charge-pump regulator (5.00V output); when pulled high (IN), it engages an internal 2.5Ω pass-through switch connecting IN directly to OUT for 3V operation. This hardware-selectable dual-mode capability eliminates external switching components and allows a single MAX1686HEUA+ design to serve global SIM card variants without firmware changes or layout modifications.
What is the shutdown behavior of the MAX1686HEUA+?
When SHDN is driven low, the MAX1686HEUA+ enters shutdown mode: the oscillator, reference, and control logic are disabled; supply current drops below 0.1µA; and an internal N-channel FET actively discharges the OUT pin to GND. This ensures safe, glitch-free SIM card insertion or removal and prevents back-driving of the host system. The MAX1686HEUA+ resumes normal operation within 1.5ms of SHDN returning high, with soft-start limiting inrush current to ≤200mA.
Which external capacitors are required for basic operation of the MAX1686HEUA+?
The MAX1686HEUA+ requires exactly three external ceramic capacitors for standard operation: a 0.047µF flying capacitor (CX) between CXP and CXN pins, a 0.1µF input bypass capacitor (CIN) from IN to GND, and a 2.2µF output filter capacitor (COUT) from OUT to GND. These values enable full 12mA output capability at 5V with <50mV ripple. For low-input-voltage operation (2.7V), Maxim recommends increasing CIN to 0.47µF and COUT to 10µF to maintain regulation stability.
Does the MAX1686HEUA+ include protection features beyond shutdown?
Yes, the MAX1686HEUA+ integrates multiple protection features: undervoltage lockout (UVLO) triggers at ~1.2V to prevent erratic operation during brownout; short-circuit protection limits output current to 20–200mA depending on conditions; soft-start restricts peak inrush to ≤200mA; and thermal shutdown activates if junction temperature exceeds +150°C. These protections operate independently of external components and are fully specified across the -40°C to +85°C operating range of the MAX1686HEUA+.
MAX1686HEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Charge Pump, SIM Cards
- Voltage - Input:
- 2.7V ~ 4.2V
- Number of Outputs:
- 1
- Voltage - Output:
- 5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX1686HEUA+ FAQ
1.How can I place an order for MAX1686HEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1686HEUA+ 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 MAX1686HEUA+ reliable?
The price and inventory of MAX1686HEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1686HEUA+ is usually 5 days.
3.What payment methods are accepted for MAX1686HEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1686HEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1686HEUA+?
MAX1686HEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1686HEUA+ 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 MAX1686HEUA+?
For technical support, including MAX1686HEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1686HEUA+ requirements.
6.How does Aetrix verify that MAX1686HEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1686HEUA+ 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 MAX1686HEUA+ meets industry standards.
7.What is the process for return or replacement of MAX1686HEUA+?
All MAX1686HEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1686HEUA+, 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 MAX1686HEUA+ part is unused and in its original packaging.
Return procedure for MAX1686HEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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