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Analog Devices Inc./Maxim Integrated MAX857ESA+T
- Part No.:
- MAX857ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX857ESA+T.pdf
- Description:
- IC REG BOOST ADJ 500MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,384
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Product details
Overview
The MAX857ESA+T from Maxim Integrated is an adjustable-output, step-up DC-DC switching regulator optimized for low-input-voltage battery-powered systems. It accepts 0.8V–6.0V input and delivers 2.7V–6.0V adjustable output with ±1.5% reference tolerance, 500mA peak inductor current limit, and 25µA quiescent supply current - enabling high-efficiency operation (≥85% at 100mA) in glucose meters and portable medical instrumentation.
For engineers reviewing the MAX857ESA+T datasheet, MAX857ESA+T pinout, MAX857ESA+T application, or MAX857ESA+T equivalent, this device supports precision feedback-based voltage regulation, integrated low-battery detection (LBI/LBO), ultra-low startup voltage (0.8V typ), and SO-8 packaging suitable for space-constrained, wide-temperature industrial and medical designs.
Technical Context
The MAX857ESA+T implements a minimum-off-time, current-limited pulse-frequency modulation (PFM) control scheme without an oscillator - enabling variable-frequency switching up to 500kHz while maintaining ultra-low quiescent current. Its internal N-channel power MOSFET features ~1Ω on-resistance and a low gate threshold for reliable start-up from 0.8V input.
It integrates a precision 1.25V reference (±1.5% over temperature), low-battery comparator (1.25V threshold with 25mV hysteresis), and feedback (FB) input for external resistor-divider-based output programming - all operating across –40°C to +85°C with internal bootstrapping from the OUT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8V to 6.0V - supports single- or dual-cell alkaline/NiMH batteries down to near-dead state. |
| Output Voltage Range | 2.7V to 6.0V (adjustable via FB pin) - enables flexible rail generation for analog sensors or mixed-signal ICs. |
| Peak Inductor Current Limit | 500mA ±100mA - permits use of compact, low-cost 47µH inductors with minimal saturation risk. |
| Quiescent Supply Current | 25µA (typ) - extends battery life in always-on portable medical devices like glucose meters. |
| Reference Voltage Accuracy | ±1.5% over –40°C to +85°C - ensures stable feedback loop performance across industrial temperature range. |
| Shutdown Current | 1µA (max) - enables deep sleep modes without significant battery drain. |
| Switching Frequency | Up to 500kHz - allows small external passive components and reduces EMI filtering burden. |
Pinout & Package
MAX857ESA+T is housed in an 8-pin SO (Small Outline) package with 1.27mm lead pitch, JEDEC MS-012AC compliant, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX | N-channel power MOSFET drain | Switch node connecting to external inductor and Schottky diode - requires short, low-inductance PCB routing. |
| GND | Power ground | Low-impedance return path; must be soldered directly to ground plane to minimize noise and thermal resistance. |
| OUT | Regulator output / bootstrap supply | Delivers regulated output voltage and powers internal circuitry - used as bootstrap source for gate drive. |
| LBI | Low-battery input | Analog input to internal comparator; threshold = 1.25V - connect to resistive divider from VIN to detect end-of-life battery. |
| LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V - requires external pull-up to OUT for CMOS-compatible logic signaling. |
| REF | 1.25V precision reference output | Stable voltage reference for external circuits (≤250µA source); bypass with 0.22µF to GND if loaded. |
| FB | Feedback input | Connects to resistor divider between OUT and GND to set output voltage per VOUT = 1.25V × (1 + R1/R2). |
| SHDN | Active-low shutdown input | Pulls entire regulator into 1µA standby mode; logic-high ≥1.6V disables shutdown, logic-low ≤0.4V activates it. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable 2.7V–6.0V via external resistor divider on FB pin - eliminates need for multiple fixed-output SKUs. |
| Ultra-low start-up voltage | 0.8V typical - enables operation from deeply discharged batteries in portable medical equipment. |
| Integrated low-battery detector | Dedicated LBI/LBO pins with 1.25V threshold and 25mV hysteresis - provides system-level battery health monitoring without external comparators. |
| High-efficiency PFM architecture | ≥85% efficiency at 100mA load - achieved via current-limited switching and absence of fixed-frequency oscillator losses. |
| Internal 1.25V reference | ±1.5% tolerance over full temperature range - supports accurate closed-loop regulation and external ADC reference sharing. |
Applications
| Glucose Meters | Portable Data-Collection Equipment |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration using electrochemical sensor strips. IC Role / Device Role / Timing Role: Step-up regulator generating stable 3.3V or 5V rail from 1.5–3.0V alkaline/NiMH cells to power microcontroller, sensor interface, and LCD backlight. Use Value: 25µA quiescent current and 0.8V start-up extend usable battery life by >30% versus legacy boost converters in intermittent-use medical devices. |
Use Scenario: Ruggedized barcode scanner or RFID reader deployed in field logistics or warehouse inventory management. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying regulated 3.3V to MCU, radio transceiver, and imaging sensor from 2-cell AA/AAA batteries. Use Value: 500mA peak switch current and SO-8 thermal performance support burst-mode operation during scan events without thermal derating. |
| Personal Data Communicators | Medical Instrumentation |
Use Scenario: Palm-sized PDA with wireless connectivity, touch interface, and real-time OS requiring clean, efficient power rails. IC Role / Device Role / Timing Role: Adjustable-output boost converter delivering 3.3V or 5V to processor core and peripheral I/O from single Li-ion cell or dual alkaline cells. Use Value: Variable-frequency PFM operation minimizes conducted EMI in RF-sensitive environments, avoiding interference with Bluetooth/Wi-Fi bands. |
Use Scenario: Portable ECG monitor or pulse oximeter operating from coin-cell or AAA batteries with strict size and runtime constraints. IC Role / Device Role / Timing Role: High-accuracy voltage source for analog front-end (AFE) and reference for 12-bit ADC, powered from low-voltage battery input. Use Value: ±1.5% reference tolerance and 0.22µF REF bypass ensure <0.5% total system gain error across –40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 3.3V/5V output only; no FB pin; 300mA peak current; 2.5µA quiescent current. | Lacks adjustable output and low-battery detection - suitable only for fixed-rail, ultra-low-IQ applications. | Select when output voltage is fixed and battery monitoring is handled externally. |
| LT1930ES5#TRMPBF | 500kHz fixed-frequency PWM; 1.2A switch current; 100µA quiescent current; no integrated LBI/LBO. | Higher output current but higher IQ and no battery monitoring - better for high-power, non-battery-critical systems. | Select when higher load capability (>100mA continuous) is required and temperature range is commercial only. |
Compared with TPS61200DRCT and LT1930ES5#TRMPBF, the MAX857ESA+T uniquely combines adjustable output, integrated low-battery detection, and sub-30µA quiescent current in an industrial-temperature SO-8 package - making it optimal for battery runtime-critical medical and portable instrumentation where flexibility and system-level monitoring are essential.
Availability
MAX857ESA+T is available at Aetrix Electronics and suitable for glucose meters, portable data-collection equipment, personal data communicators, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX857ESA+T 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, medical, and communications applications.
The MAX857ESA+T belongs to Maxim's legacy high-efficiency, low-voltage step-up DC-DC converter family - designed specifically for battery-powered portable instrumentation where ultra-low quiescent current, wide input range, and integrated system monitoring are critical.
FAQ
What is the minimum input voltage required for the MAX857ESA+T to start regulating?
The MAX857ESA+T has a typical start-up input voltage of 0.8V, allowing it to begin regulation even from nearly depleted alkaline or NiMH cells. This value is confirmed across load conditions up to 100mA and remains functional down to –40°C. The MAX857ESA+T achieves this via a low-threshold N-channel MOSFET and internal bootstrapping from the OUT pin - ensuring reliable operation in glucose meters and other battery-sensitive medical devices.
How is the output voltage set on the MAX857ESA+T?
The MAX857ESA+T uses the FB (feedback) pin to set output voltage via an external resistor divider between OUT and GND. The formula is VOUT = 1.25V × (1 + R1/R2), where R1 connects OUT to FB and R2 connects FB to GND. The internal 1.25V reference has ±1.5% tolerance over temperature, and FB input bias current is ≤100nA - enabling use of high-value resistors (e.g., 100kΩ/100kΩ for 2.5V) without accuracy loss. This configuration is explicitly defined for MAX857/MAX859 in the datasheet.
Does the MAX857ESA+T include low-battery detection functionality?
Yes, the MAX857ESA+T integrates a dedicated low-battery detector with LBI (input) and LBO (open-drain output) pins. The internal comparator triggers when LBI falls below 1.25V (with 25mV hysteresis), causing LBO to sink current. To configure, connect LBI to a resistor divider from VIN, and pull LBO up to OUT with ≥10kΩ. This feature is documented in the Pin Description and Detailed Description sections and is functionally identical across MAX857/MAX859 variants.
What package type and temperature range does the MAX857ESA+T use?
The MAX857ESA+T is supplied in an 8-pin SO (Small Outline) package per JEDEC MS-012AC, with 1.27mm lead pitch and specified operating temperature range of –40°C to +85°C. This is explicitly listed in the Ordering Information table under "MAX857ESA" and confirmed in the Package Information section. The "E" suffix denotes the extended temperature grade, and "SA" denotes the SO package - distinguishing it from µMAX (CUA) or CERDIP (MJA) variants.
What is the peak inductor current limit for the MAX857ESA+T?
The MAX857ESA+T has a fixed peak inductor current limit of 500mA ±100mA, as stated in both the General Description and Electrical Characteristics tables. This value applies specifically to MAX857/MAX856 variants (vs. 125mA for MAX858/MAX859). The 500mA limit enables use of compact 47µH inductors with sufficient saturation margin - a key design advantage validated in Typical Operating Characteristics graphs and Design Procedure guidance.
MAX857ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 500mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX857ESA+T FAQ
1.How can I place an order for MAX857ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX857ESA+T 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 MAX857ESA+T reliable?
The price and inventory of MAX857ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX857ESA+T is usually 5 days.
3.What payment methods are accepted for MAX857ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX857ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX857ESA+T?
MAX857ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX857ESA+T 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 MAX857ESA+T?
For technical support, including MAX857ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX857ESA+T requirements.
6.How does Aetrix verify that MAX857ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX857ESA+T 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 MAX857ESA+T meets industry standards.
7.What is the process for return or replacement of MAX857ESA+T?
All MAX857ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX857ESA+T, 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 MAX857ESA+T part is unused and in its original packaging.
Return procedure for MAX857ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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