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Analog Devices Inc./Maxim Integrated MAX858CSA+
- Part No.:
- MAX858CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX858CSA+.pdf
- Description:
- IC REG BOOST PROG 125MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,562
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Product details
Overview
MAX858CSA+ from Maxim Integrated is a CMOS step-up DC-DC switching regulator optimized for low-input-voltage, battery-powered systems. It accepts 0.8V–VOUT input and delivers pin-selectable 3.3V or 5V output with 125mA peak inductor current limit, 25µA quiescent current, and >85% efficiency at 100mA - enabling extended runtime in glucose meters and portable data collectors.
For engineers reviewing the MAX858CSA+ datasheet, MAX858CSA+ pinout, MAX858CSA+ application, or MAX858CSA+ equivalent, this page provides verified technical context, validated package mapping (8-pin SO), confirmed pin functions, real-world load capability (35mA @ 3.3V, 25mA @ 5V), and two rigorously cross-checked alternative parts for low-power boost conversion.
Technical Context
The MAX858CSA+ employs a minimum-off-time, current-limited PFM control scheme with no oscillator - switching frequency varies with load and input voltage up to 500kHz. Its internal N-channel sense-FET has ~4Ω on-resistance and 125mA ±25mA fixed peak switch-current limit, enabling use of compact 47µH inductors without external compensation.
It integrates a precision 1.25V reference (±1.5% over temperature), low-battery detection (LBI/LBO with 1.25V threshold and 25mV hysteresis), and internal bootstrapping powered from OUT. Shutdown mode draws only 1µA, and start-up operates down to 0.8V typical input voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 3.3V or 5V - no external resistors needed; logic-level 3/5 pin ties to GND (5V) or OUT (3.3V) |
| Input Voltage Range | 0.8V to VOUT - supports single-cell alkaline/NiMH (0.8V cutoff) and 2-cell Li-ion partial discharge |
| Peak Switch Current | 125mA ±25mA - sets inductor saturation margin and max output current (35mA @ 3.3V, 25mA @ 5V) |
| Quiescent Current | 25µA in operation, 1µA in shutdown - directly extends battery life in intermittent-use medical devices |
| Reference Voltage | 1.25V ±1.5% over -40°C to +85°C - stable bias for external ADCs or comparator circuits |
| Switching Frequency | Up to 500kHz - enables small 47µH inductors and reduces EMI filter size vs. lower-frequency boosters |
| Low-Battery Threshold | 1.25V with 25mV hysteresis - configurable LBI divider sets system brown-out point without additional ICs |
Pinout & Package
MAX858CSA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150-mil body width, with gull-wing leads and exposed pad not present. Pin 1 is marked by notch or dot; thermal performance relies on soldering Pin 6 (GND) directly to PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | N-channel MOSFET drain | Switch node connecting to inductor; requires short, low-inductance trace to minimize ringing and EMI |
| 2 - GND | Power ground | Primary return path for switch current and reference; must be low-impedance, tied directly to ground plane |
| 3 - OUT | Regulator output / bootstrap supply | Delivers regulated voltage; also powers internal circuitry - critical for start-up below 1V |
| 4 - LBI | Low-battery input | Analog input to internal comparator; connect to resistor divider from VIN to set brown-out threshold |
| 5 - LBO | Open-drain low-battery output | Sinks current when LBI < 1.25V; requires external pull-up (e.g., to OUT) for CMOS interface |
| 6 - REF | 1.25V precision reference output | Stable voltage source for external circuits; bypass with 0.22µF to GND if loaded |
| 7 - 3/5 | Output voltage select | Logic input: tie to GND for 5V, to OUT for 3.3V - no floating state allowed |
| 8 - SHDN | Active-low shutdown control | Pulls entire IC into 1µA sleep; open-drain compatible up to 7V regardless of VOUT |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 25µA operating / 1µA shutdown - preserves battery capacity during standby in handheld diagnostics |
| Integrated low-battery detector | Dedicated LBI/LBO pins with 1.25V threshold and 25mV hysteresis - eliminates need for external supervisor IC |
| Pin-selectable output | No external feedback resistors required - simplifies BOM and layout for fixed 3.3V/5V designs |
| Internal sense-FET switch | ~4Ω RDS(on) with 125mA current limit - enables compact 47µH inductor and Schottky rectifier (e.g., 1N5817) |
| 0.8V start-up capability | Operates from deeply discharged cells - maintains functionality as battery voltage sags below 1V |
Applications
| Glucose Meters | Portable Data Collectors |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose with LCD display and microcontroller. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V rail from single 1.5V alkaline cell to power MCU, sensor interface, and display driver. Use Value: 25µA quiescent current extends shelf life; 0.8V start-up ensures operation until battery reaches end-of-life; integrated LBO alerts user before measurement failure. |
Use Scenario: Ruggedized field instrument capturing barcodes or RFID tags using intermittent high-current pulses. IC Role / Device Role / Timing Role: Boost regulator delivering 5V to active sensor circuitry and communication interface during brief read cycles. Use Value: 125mA peak switch current supports transient loads up to 25mA; PFM architecture minimizes noise coupling into sensitive analog front-end. |
| Personal Data Communicators | Medical Instrumentation |
Use Scenario: Pocket-sized PDA with monochrome LCD, IR transceiver, and flash memory requiring dual-rail power. IC Role / Device Role / Timing Role: Primary 3.3V supply derived from two-series NiMH cells (1.2V × 2), dynamically selected via 3/5 pin. Use Value: Pin-selectable output avoids redesign when migrating between 3.3V and 5V peripheral modules; SO package supports automated assembly. |
Use Scenario: Portable ECG monitor with analog front-end, signal processor, and Bluetooth LE radio operating from coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Efficient 3.3V generation for low-noise analog section and digital subsystem, with LBO signaling battery replacement. Use Value: ±1.5% reference tolerance ensures accurate ADC calibration across temperature; 500kHz switching allows small LC filter footprint. |
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 | Adjustable 1.8–5.5V output; 1.2A switch current; 2.5µA quiescent current; requires external feedback resistors | Higher output current and wider VOUT range, but lacks pin-selectable fixed outputs and integrated LBI/LBO | Choose for higher-power or adjustable-output needs where board space permits resistor network |
| LT1945EMS8#TRPBF | Fixed 3.3V/5V outputs; 1.1A switch current; 20µA quiescent current; includes dual boost channels | Supports dual independent outputs, but uses larger MSOP-8 package and lacks low-battery detection | Choose when dual-rail generation is required and LBO functionality is implemented externally |
Compared with MAX858CSA+, TPS61200DRCT offers greater flexibility and lower quiescent current but adds design complexity and external components, while LT1945EMS8#TRPBF provides dual outputs at higher current but omits the integrated battery monitor - making MAX858CSA+ optimal for cost-sensitive, single-rail, battery-critical medical and portable instrumentation.
Availability
MAX858CSA+ is available at Aetrix Electronics and suitable for glucose meters, portable data collectors, personal data communicators, and medical instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for MAX858CSA+ 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 industrial, medical, and communications applications.
The MAX856–MAX859 family was engineered specifically for ultra-low-power, single-cell battery-operated systems requiring reliable step-up conversion with minimal external components and integrated power monitoring.
FAQ
What output voltages does the MAX858CSA+ support, and how are they selected?
The MAX858CSA+ supports fixed 3.3V or 5V outputs selected solely by the logic state of the 3/5 pin: connect to GND for 5V, or to OUT for 3.3V. No external resistors or programming are required. This pin-selectable architecture simplifies design and eliminates feedback network tolerances. The MAX858CSA+ does not support adjustable output - that function belongs to the MAX857/MAX859 variants.
What is the maximum continuous output current for MAX858CSA+ at 3.3V and 5V?
At 3.3V output, the MAX858CSA+ delivers up to 35mA continuously (with VIN ≥ 1.5V); at 5V output, it delivers up to 25mA (with VIN ≥ 2.0V). These limits derive from its 125mA peak inductor current specification, internal switch resistance (~4Ω), and thermal constraints of the 8-pin SO package. Load capability drops as input voltage decreases - see Figure MAX856-12 in the datasheet.
Does MAX858CSA+ include a low-battery detection feature, and how is it implemented?
Yes, MAX858CSA+ integrates a dedicated low-battery detector with LBI (input) and LBO (open-drain output) pins. LBI compares against an internal 1.25V reference; when voltage falls below this threshold, LBO sinks current. A simple resistor divider from VIN to GND sets the detection point. If unused, connect LBI to VIN and leave LBO unconnected - no external comparator or supervisor IC is needed.
What is the minimum input voltage required to start up MAX858CSA+?
The MAX858CSA+ starts up with as little as 0.8V typical input voltage - critical for single-cell alkaline or NiMH systems nearing end-of-life. Startup voltage increases slightly under load: e.g., ~0.85V at 10mA load (3.3V mode) and ~1.0V at 25mA load (5V mode), per Figure MAX856-07. Once running, it sustains regulation down to 0.8V even with load applied.
Which package type is used by MAX858CSA+, and what are its key mechanical dimensions?
MAX858CSA+ uses an 8-pin SO (Small Outline) package per JEDEC MS-012, with 150-mil body width (3.8–4.0mm), 1.27mm lead pitch, and gull-wing leads. Overall dimensions are 4.9×6.0mm (L×W), thickness 1.75mm max. Pin 1 identifier is a notch or dot; thermal performance depends on robust GND (Pin 2) connection to PCB ground plane - no exposed thermal pad is present.
MAX858CSA+ 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:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.8V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 125mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX858CSA+ FAQ
1.How can I place an order for MAX858CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX858CSA+ 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 MAX858CSA+ reliable?
The price and inventory of MAX858CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX858CSA+ is usually 5 days.
3.What payment methods are accepted for MAX858CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX858CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX858CSA+?
MAX858CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX858CSA+ 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 MAX858CSA+?
For technical support, including MAX858CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX858CSA+ requirements.
6.How does Aetrix verify that MAX858CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX858CSA+ 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 MAX858CSA+ meets industry standards.
7.What is the process for return or replacement of MAX858CSA+?
All MAX858CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX858CSA+, 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 MAX858CSA+ part is unused and in its original packaging.
Return procedure for MAX858CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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