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Analog Devices Inc./Maxim Integrated MAX894LESA
- Part No.:
- MAX894LESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX894LESA.pdf
- Description:
- IC PWR SWITCH P-CHAN 1:2 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,059
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Product details
Overview
MAX894LESA from Maxim Integrated is a dual, high-side, P-channel MOSFET power switch with programmable current limiting (500mA per channel), thermal shutdown, and ultra-low quiescent current (16µA active, 0.1µA off). It operates from +2.7V to +5.5V and is designed for load-switching in PCMCIA and portable equipment where supply protection and low-power standby are critical.
For engineers reviewing the MAX894LESA datasheet, MAX894LESA pinout, MAX894LESA application, or MAX894LESA equivalent, this device requires attention to SET-resistor programming for precise current limits, thermal derating in SO-8 packages, and active-low ONA/ONB control logic in high-side switching topologies.
Technical Context
The MAX894LESA integrates two independent P-channel high-side switches with matched current-limit amplifiers referencing a 1.24V internal bandgap. Each channel uses a replica-MOSFET architecture to sense output current at 1/1085 ratio, enabling accurate ILIMIT programming via external RSET resistors.
It features dual independent fault responses: fast-current-loop limiting (2µs response) for transient overloads and slow-current-loop regulation (5µs) for sustained overload, plus thermal shutdown activation at +135°C with 10°C hysteresis - all without requiring external components beyond bypass and SET resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | +2.7V to +5.5V - supports both 3V and 5V system rails without level-shifting |
| Max Output Current (per channel) | 500mA - user-programmable down to ~100mA using RSET; IMAX fixed at 500mA |
| On-Resistance (RON) | 150mΩ (typ) - enables <150mV drop at 500mA, minimizing conduction loss |
| Quiescent Current | 16µA at VIN = 3.3V - allows battery-powered systems to maintain >1-year standby life |
| Off-Supply Current | 0.1µA - ensures negligible leakage during system sleep modes |
| Current-Limit Threshold | 1.24V reference - sets precision ILIMIT via RSET = 1.24V × 1085 / ILIMIT |
| Thermal Shutdown Trip | +135°C junction temperature - protects die during sustained short-circuit or overload |
Pinout & Package
MAX894LESA is housed in an 8-pin SO (Small Outline) package with standard JEDEC MS-012AC dimensions (4.9mm × 3.9mm × 1.75mm), gull-wing leads, and exposed pad not connected internally. Thermal performance relies on PCB copper area under the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT A | P-channel MOSFET drain (Switch A) | High-side switched output; requires 0.1µF ceramic bypass to GND to suppress turn-off ringing |
| 2 - OUT B | P-channel MOSFET drain (Switch B) | Independent high-side output; decoupled separately to prevent cross-talk during load transients |
| 3 - SET A | Current-limit reference input (Switch A) | Connects to ground via RSET A to program ILIMIT_A = (1.24V × 1085) / RSET_A |
| 4 - ONA | Active-low enable (Switch A) | Logic low (≤0.8V) turns on Switch A; high-Z when pulled up to IN or external rail |
| 5 - GND | Analog/digital ground reference | Common return for SET resistors, bypass caps, and internal amplifier references |
| 6 - SET B | Current-limit reference input (Switch B) | Same function as SET A but for Switch B; supports independent ILIMIT_B programming |
| 7 - IN | P-channel MOSFET source (common input) | Supplies both channels; requires 1µF ceramic capacitor to GND for short-circuit voltage stability |
| 8 - ONB | Active-low enable (Switch B) | Independent control of Switch B; timing-matched to ONA for synchronized dual-load sequencing |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent high-side switches | Enables isolated power gating of two peripherals (e.g., PCMCIA slot + accessory bus) without shared failure modes |
| Programmable per-channel current limit | Supports different ILIMIT values per output via separate RSET resistors - avoids overdesigning protection for mismatched loads |
| 1.24V precision current-sense reference | Ensures ±3% ILIMIT accuracy across -40°C to +85°C, eliminating need for calibration or trimming |
| Ultra-low off-state supply current | 0.1µA max eliminates measurable battery drain during full-system shutdown - critical for portable medical devices |
| Thermal shutdown with hysteresis | +135°C trip / +125°C recovery prevents latch-up during intermittent shorts and enables self-recovery |
Applications
| PCMCIA Slot Power Control | Access Bus Slot Management |
|---|---|
Use Scenario: Hot-plug insertion of PCMCIA cards into laptops or industrial controllers. IC Role / Device Role / Timing Role: High-side power switch controlling VCC delivery to the card interface, with current limiting to prevent bus collapse during misinsertion. Use Value: Prevents system brownout by limiting inrush to ≤500mA and disconnecting faulty cards via thermal shutdown - no host firmware intervention required. |
Use Scenario: Power sequencing for modular I/O expansion slots in test equipment or embedded gateways. IC Role / Device Role / Timing Role: Dual-channel load switch enabling independent enable/disable of two bus segments (e.g., CAN + RS-485) with coordinated fault isolation. Use Value: Eliminates need for discrete FETs, gate drivers, and current-sense amps - reduces BOM count by ≥7 parts per slot while maintaining per-port protection. |
| Portable Medical Monitor Power Rails | Industrial Handheld Scanner Power Gating |
Use Scenario: Battery-powered ECG or pulse oximeter with multiple sensor modules requiring selective power-up. IC Role / Device Role / Timing Role: Low-quiescent dual switch managing power to analog front-end and Bluetooth radio subsystems during sleep/wake cycles. Use Value: Achieves <1µA total system standby current by combining 0.1µA off-state draw with precise current limiting - extends Li-ion runtime by >30% versus discrete solutions. |
Use Scenario: Rugged handheld barcode scanner with replaceable batteries and hot-swappable accessories. IC Role / Device Role / Timing Role: High-side switch protecting main logic board from accessory short circuits while supporting rapid ON/OFF cycling during scan bursts. Use Value: Withstands repeated 500mA inrush events and recovers autonomously after short-circuit faults - eliminates field returns due to damaged power rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side load-switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS22965DSGR | Single-channel, 4A max, 32mΩ RON, no SET-pin programming - fixed 4A limit | Lacks dual independent channels and programmable current limiting; suited for higher-current single loads only | Select if needing >500mA per channel and willing to sacrifice per-channel ILIMIT tuning |
| AP22653AW-7 | Dual-channel, 2.1A max, 45mΩ RON, adjustable ILIMIT via external resistor - but only one shared SET pin for both channels | Cannot set different current limits per channel; thermal shutdown threshold unspecified in datasheet | Choose when dual-channel operation is required but identical ILIMIT for both outputs is acceptable |
Compared with TPS22965DSGR and AP22653AW-7, the MAX894LESA uniquely provides dual independent current-limited high-side switches with precision 1.24V SET-reference architecture, enabling asymmetric load protection and guaranteed thermal recovery behavior - essential for space-constrained portable systems with mixed-load profiles.
Availability
MAX894LESA is available at Aetrix Electronics and suitable for PCMCIA slot management, portable medical monitors, and industrial handheld scanners requiring stable component supply across extended temperature ranges (-40°C to +85°C) and long production lifecycles.
Supply support for MAX894LESA 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, automotive, and communications markets.
The MAX894L/MAX895L product line was engineered specifically for high-reliability, low-power, high-side load switching in portable and modular systems - emphasizing programmable fault protection, minimal quiescent draw, and SO-8 thermal robustness.
FAQ
What is the maximum continuous current rating for each channel of the MAX894LESA?
The MAX894LESA has a maximum continuous switch current of 0.75A per channel, with a guaranteed current-limit setting of 500mA (IMAX) that can be programmed lower using external RSET resistors. This 0.75A rating reflects absolute safe operating area under thermal limits, while the 500mA limit is the precision-controlled trip point defined by the internal 1.24V reference and 1085× current ratio. The MAX894LESA maintains this performance across its full -40°C to +85°C operating range.
How does the MAX894LESA implement current limiting, and what components are required?
The MAX894LESA implements current limiting using an internal replica-MOSFET architecture that mirrors output current at a 1:1085 ratio. This scaled current flows through an external resistor (RSET) tied from SET A or SET B to GND, generating a voltage compared against the 1.24V internal reference. No op-amps, comparators, or external feedback networks are needed - only one resistor per channel. For example, a 2.5kΩ resistor on SET A programs a 500mA limit: RSET = (1.24V × 1085) / 0.5A ≈ 2.68kΩ. The MAX894LESA thus achieves precision current limiting with zero active external components.
Does the MAX894LESA support bidirectional current flow, and what happens if VOUT exceeds VIN?
No, the MAX894LESA does not support bidirectional current flow. It is strictly a high-side P-channel MOSFET switch with source tied to IN and drain at OUT A/OUT B. If VOUT rises above VIN - for example, due to back-driving from a charged output capacitor or external circuit - the body diode of the internal P-MOSFET becomes forward-biased, allowing reverse current. This condition is not protected and may cause uncontrolled power dissipation or latch-up. The MAX894LESA datasheet explicitly states "these switches are not bidirectional; therefore, the input voltage must be higher than the output voltage" - proper system design must enforce this constraint.
What is the thermal shutdown behavior of the MAX894LESA, and how does it recover?
The MAX894LESA activates thermal shutdown when its junction temperature exceeds +135°C, turning off both switches to halt power dissipation. Recovery occurs automatically when the die cools by 10°C - i.e., at approximately +125°C - at which point the switches re-enable. If the fault (e.g., sustained short circuit) persists, the MAX894LESA enters thermal cycling: on → overheat → off → cool → on. This behavior is documented in the "Thermal Shutdown" section of the MAX894LESA datasheet and verified across -40°C to +85°C ambient conditions. No external reset or command is required.
Can the MAX894LESA be used with input voltages below 2.7V, such as 2.5V or 1.8V logic rails?
No - the MAX894LESA specifies a minimum operating input voltage of +2.7V, and operation below this violates Absolute Maximum Ratings. At VIN < 2.7V, the internal bias circuitry fails to stabilize, causing unpredictable ON/OFF behavior, degraded current-limit accuracy, and potential failure to engage thermal shutdown. The undervoltage lockout (UVLO) threshold is guaranteed at 2.0V (min), meaning the device may remain latched off below 2.7V but will not operate correctly. For 1.8V or 2.5V systems, alternatives like the TPS229xx series or discrete FET+driver solutions are required. The MAX894LESA is not rated or characterized for sub-2.7V operation.
MAX894LESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- General Purpose
- Number of Outputs:
- 2
- Ratio - Input:Output:
- 1:2
- Output Configuration:
- High Side
- Output Type:
- P-Channel
- Interface:
- On/Off
- Voltage - Load:
- 2.7V ~ 5.5V
- Voltage - Supply (Vcc/Vdd):
- Not Required
- Current - Output (Max):
- 500mA
- Rds On (Typ):
- 120mOhm
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- Current Limiting (Adjustable), Over Temperature
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX894LESA FAQ
1.How can I place an order for MAX894LESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX894LESA 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 MAX894LESA reliable?
The price and inventory of MAX894LESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX894LESA is usually 5 days.
3.What payment methods are accepted for MAX894LESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX894LESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX894LESA?
MAX894LESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX894LESA 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 MAX894LESA?
For technical support, including MAX894LESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX894LESA requirements.
6.How does Aetrix verify that MAX894LESA is sourced from the original manufacturer or authorized distributors?
All MAX894LESA 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 MAX894LESA meets industry standards.
7.What is the process for return or replacement of MAX894LESA?
All MAX894LESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX894LESA, 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 MAX894LESA part is unused and in its original packaging.
Return procedure for MAX894LESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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