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Analog Devices Inc./Maxim Integrated MAX4787EXS+
- Part No.:
- MAX4787EXS+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Current Regulation/Management
- Package:
- -
- Datasheet:
-
MAX4787EXS+.pdf
- Description:
- IC SWITCH 1X1 SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
MAX4787EXS+ from Maxim Integrated is a 100mA forward/reverse current-limiting load switch in a 4-pin SC70 package, featuring 0.7Ω on-resistance, 14ms guaranteed fault-blanking time, and latch-off fault response with FLAG output. It operates from 2.3V to 5.5V and is designed for power rail control in portable electronics where overcurrent protection and compact size are critical.
For engineers reviewing the MAX4787EXS+ datasheet, MAX4787EXS+ pinout, MAX4787EXS+ application, or MAX4787EXS+ equivalent, this device is selected for its precise 100mA current limit, thermal shutdown at +150°C, reverse-current protection, undervoltage lockout (2.2V rising threshold), and low 8µA latch-off supply current - key parameters for reliable battery-powered load switching.
Technical Context
The MAX4787EXS+ implements dual-direction current sensing using internal sense resistors and reference comparators to detect both forward (IN→OUT) and reverse (OUT→IN) overcurrent conditions. Fault detection triggers after a fixed 14ms blanking window, after which the switch latches off and asserts an open-drain FLAG signal.
Unlike autoretry variants (e.g., MAX4788), the MAX4787EXS+ remains in persistent latch-off until ON is cycled low-then-high or VIN drops below UVLO (~2.2V). Its BiCMOS process enables fast 5µs current-limit response and supports operation across -40°C to +85°C with guaranteed 100mA forward/240mA reverse current limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Forward Current Limit | 100mA min - guarantees safe load connection without exceeding specified current under fault conditions |
| Reverse Current Limit | 240mA min - prevents backflow damage when OUT voltage exceeds IN during hot-swap or standby |
| On-Resistance | 0.7Ω typ at 3.3V - minimizes voltage drop and power loss in high-efficiency 3.3V/5V rail switching |
| Blanking Time | 14ms min - suppresses false faults during capacitive load turn-on or transient surges |
| Latch-Off Supply Current | 8µA max - enables ultra-low-power fault-hold state without external supervision |
| Undervoltage Lockout | 2.2V rising threshold - prevents erratic switching during brown-out or power-up ramp |
| Thermal Shutdown | +150°C activation - protects die integrity during sustained short-circuit or overload |
Pinout & Package
Package: 4-pin SC70 (2.0mm × 2.1mm × 0.95mm height), surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Switch Output | Drives load; requires 0.1µF ceramic bypass to GND to suppress turn-off inductive kick |
| 2 (GND) | Ground Reference | Primary return path for load current and internal bias; must be low-impedance |
| 3 (FLAG) | Fault Indicator Output | Open-drain output pulled low during latch-off; requires external pullup to IN for logic-level signaling |
| 4 (ON) | Active-High Enable Input | High (>2.0V) enables switch; low (<0.8V) forces shutdown with 0.01µA quiescent current |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 100mA Forward Current Limit | Enables predictable overcurrent protection for USB peripherals or sensor rails without derating |
| Reverse-Current Protection (240mA) | Prevents backfeed from powered loads into main supply during sleep or disconnect events |
| Latched FLAG Output with Blanking | Provides unambiguous fault diagnosis and eliminates need for continuous microcontroller polling |
| Thermal Shutdown + Hysteresis | Shuts down at +150°C and re-enables only after cooling ~15°C - avoids thermal oscillation |
| Low 65µA Quiescent Current | Minimizes standby power draw in always-on subsystems such as GPS or Bluetooth modules |
Applications
| Portable GPS Receivers | Smartphone Peripheral Rails |
|---|---|
|
Use Scenario: Powering GPS RF front-end during acquisition phase while isolating from main PMIC during deep sleep. IC Role / Device Role / Timing Role: Load switch controlling 3.3V GPS LNA supply with fault isolation and latch-off reporting. Use Value: Prevents GPS module from dragging down system rail during antenna short or ESD event; FLAG alerts host to initiate recovery. |
Use Scenario: Enabling/disabling camera flash LED driver or SIM card power in multi-rail smartphone designs. IC Role / Device Role / Timing Role: Current-limited enable switch for auxiliary 5V rail with reverse-current blocking during hot-plug. Use Value: Eliminates risk of backfeed from powered camera module into baseband processor during insertion/removal. |
| Handheld Medical Sensors | PDA Expansion Ports |
|
Use Scenario: Isolating disposable biosensor interface circuitry from main battery to prevent leakage or fault propagation. IC Role / Device Role / Timing Role: Protected power gate between MCU and analog sensor front-end with thermal and overcurrent lockout. Use Value: Ensures single-point failure in sensor port does not disable entire diagnostic unit; latch-off prevents repeated fault cycling. |
Use Scenario: Managing power to CompactFlash or SDIO expansion slots in legacy PDAs with hot-swap capability. IC Role / Device Role / Timing Role: Hot-swap controller with blanking time to absorb capacitive inrush and reverse-current blocking. Use Value: Enables safe insertion/removal of memory cards without system reset or voltage droop on main VCC rail. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-limit switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4787EXK+ | 5-pin SC70 package with identical electrical specs; adds dedicated GND pin separate from FLAG return path | Better noise immunity in high-density layouts; allows independent FLAG pullup routing | Select EXK+ when board layout requires isolated FLAG sink current path or improved thermal margin via extra GND pin |
| MAX4788EXS+ | Same 4-pin SC70 package but includes autoretry (not latch-off); 100mA forward limit; no FLAG output | Self-recovering behavior for intermittent faults; no host interrupt required | Select EXS+ when deterministic fault hold is required; choose EXS+ over EXS+ only if latch-off behavior aligns with system recovery protocol |
Compared with MAX4787EXK+, the MAX4787EXS+ saves PCB area and cost with 4-pin footprint but shares same fault response and current rating; compared with MAX4788EXS+, it trades autoretry for explicit fault signaling via FLAG - critical for safety-critical or diagnostic-aware systems.
Availability
MAX4787EXS+ is available at Aetrix Electronics and suitable for portable GPS receivers, smartphone peripheral rails, handheld medical sensors, and PDA expansion ports requiring stable component supply, long-term lifecycle support, and guaranteed parametric compliance.
Supply support for MAX4787EXS+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and consumer applications.
The MAX4785–MAX4788 family was designed specifically for space-constrained, battery-operated devices needing robust, integrated current-limit protection without external components - targeting portable electronics with stringent reliability and footprint requirements.
FAQ
What is the guaranteed forward current limit of the MAX4787EXS+?
The MAX4787EXS+ guarantees a minimum forward current limit of 100mA across -40°C to +85°C. This value is tested and specified per the datasheet's ELECTRICAL CHARACTERISTICS table, ensuring consistent overcurrent protection regardless of temperature or supply voltage within 2.3V–5.5V. The MAX4787EXS+ maintains this limit without external calibration or adjustment.
Does the MAX4787EXS+ provide reverse-current protection?
Yes, the MAX4787EXS+ provides reverse-current protection with a guaranteed minimum limit of 240mA. When voltage at OUT exceeds IN and reverse current flows beyond this threshold for longer than the 14ms blanking time, the device latches off and asserts FLAG low. This function is inherent to the MAX4787EXS+ design and requires no external components.
How does the FLAG output behave on the MAX4787EXS+ during a fault?
On the MAX4787EXS+, FLAG is an open-drain output that pulls low and remains latched low during any active fault condition - including forward/reverse overcurrent (after blanking), thermal shutdown (+150°C), or undervoltage (VIN < 2.2V). FLAG returns to high-impedance only after the fault clears and ON is toggled or VIN cycles below UVLO. An external pullup resistor to IN is required for proper logic-level signaling.
What is the on-resistance specification for the MAX4787EXS+?
The MAX4787EXS+ has a typical on-resistance of 0.7Ω at VIN = 3.3V and IOUT = 20mA, with a maximum of 1.3Ω across -40°C to +85°C. This low RON ensures minimal voltage drop and power loss - for example, only 70mV drop at 100mA - making the MAX4787EXS+ suitable for efficient 3.3V and 5V rail switching in portable systems.
Can the MAX4787EXS+ be used in place of the MAX4785EXS+?
No - the MAX4787EXS+ and MAX4785EXS+ are not interchangeable without design review. While both share the same 4-pin SC70 package and latch-off architecture, the MAX4787EXS+ is rated for 100mA forward/240mA reverse current, whereas the MAX4785EXS+ is rated for 50mA/120mA. Substituting MAX4787EXS+ for MAX4785EXS+ may cause unintended overcurrent tolerance; substituting vice versa risks premature latch-off under nominal load.
MAX4787EXS+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Product Status:
- Obsolete
- Function:
- -
- Sensing Method:
- -
- Accuracy:
- -
- Voltage - Input:
- -
- Current - Output:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX4787EXS+ FAQ
1.How can I place an order for MAX4787EXS+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4787EXS+ 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 MAX4787EXS+ reliable?
The price and inventory of MAX4787EXS+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4787EXS+ is usually 5 days.
3.What payment methods are accepted for MAX4787EXS+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4787EXS+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4787EXS+?
MAX4787EXS+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4787EXS+ 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 MAX4787EXS+?
For technical support, including MAX4787EXS+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4787EXS+ requirements.
6.How does Aetrix verify that MAX4787EXS+ is sourced from the original manufacturer or authorized distributors?
All MAX4787EXS+ 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 MAX4787EXS+ meets industry standards.
7.What is the process for return or replacement of MAX4787EXS+?
All MAX4787EXS+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4787EXS+, 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 MAX4787EXS+ part is unused and in its original packaging.
Return procedure for MAX4787EXS+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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