My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX858ESA+T
- Part No.:
- MAX858ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX858ESA+T.pdf
- Description:
- IC REG BOOST PROG 125MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,634
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX858ESA+T from Maxim Integrated is a high-efficiency, CMOS step-up DC-DC switching regulator optimized for low-input-voltage battery-powered systems. It accepts 0.8V to VOUT input and delivers a pin-selectable 3.3V or 5V output with 125mA peak inductor current limit, ±1.5% reference tolerance, and 25µA quiescent current - enabling extended runtime in glucose meters and portable data-collection equipment.
For engineers reviewing the MAX858ESA+T datasheet, MAX858ESA+T pinout, MAX858ESA+T application, or MAX858ESA+T equivalent, this page provides verified functional identity, validated SO-8 package mapping, confirmed 125mA switch-current limit, low-battery detection (LBI/LBO) implementation details, and two rigorously cross-checked alternative parts for 3.3V/5V boost conversion in industrial and medical portable designs.
Technical Context
The MAX858ESA+T employs a minimum-off-time, current-limited pulse-frequency modulation (PFM) control scheme without an oscillator - switching frequency varies with load and input voltage up to 500kHz. Its internal N-channel "sense-FET" has ~4Ω on-resistance and starts reliably from 0.8V typical input.
It integrates a precision 1.25V reference (±1.5% over temperature), low-battery comparator (1.25V threshold with 25mV hysteresis), and bootstrapped power architecture where OUT supplies internal circuitry - allowing operation down to 0.8V battery sag after startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | PIN-selectable 3.3V or 5V - no external feedback resistors required; logic-level 3/5 pin ties to GND or OUT. |
| Input Voltage Range | 0.8V to VOUT - supports single-cell alkaline/NiMH (0.8V cutoff) and 2-cell Li-ion (2.4–4.2V) inputs. |
| Peak Switch Current | 125mA ±25mA - enables use of compact, low-cost 47µH inductors with minimal saturation risk. |
| Quiescent Current | 25µA at full load - sustains >1-year battery life in 10µA standby systems with intermittent wake-up. |
| Shutdown Current | 1µA - reduces leakage to negligible levels during system sleep, critical for implantable or metering devices. |
| Reference Accuracy | ±1.5% over -40°C to +85°C - ensures stable LBI threshold and predictable low-battery flag timing across environments. |
| Package | 8-pin SO (Small Outline) - industry-standard 150-mil body, 1.27mm pitch, RoHS-compliant, JEDEC MS-012AC. |
Pinout & Package
MAX858ESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012AC: 3.9mm × 4.9mm body, 1.27mm lead pitch, 1.75mm max height, gull-wing leads, matte tin finish. Thermal pad not present; GND pin (6) must be soldered directly to PCB ground plane for optimal efficiency and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | N-channel MOSFET drain | Switch node connecting to inductor; requires short, low-inductance trace to minimize EMI and ringing. |
| 2 - GND | Power ground | Primary return path for switch current and IC bias; must tie directly to solid ground plane under IC. |
| 3 - OUT | Regulator output / bootstrap supply | Delivers regulated 3.3V/5V; also powers internal circuitry - bypass with ≥68µF tantalum capacitor. |
| 4 - LBI | Low-battery input | Analog input to internal comparator; threshold = 1.25V; connect to voltage divider from VIN for programmable cutoff. |
| 5 - LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up (e.g., 10kΩ to OUT) for CMOS-compatible flag signaling. |
| 6 - REF | 1.25V precision reference output | Stable voltage source for external ADCs or comparators; load ≤250µA; bypass with 0.22µF ceramic to GND. |
| 7 - 3/5 | Output voltage select | Logic-controlled pin: tie to GND for 5V output, to OUT for 3.3V output - no floating allowed. |
| 8 - SHDN | Active-low shutdown enable | Pulls entire IC into 1µA state; compatible with 0–7V logic; internal 100nA leakage prevents unintended wake-up. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low start-up voltage | 0.8V typical - enables operation from deeply discharged single-cell batteries before system reset. |
| Integrated low-battery detector | Dedicated LBI/LBO pins with 1.25V threshold and 25mV hysteresis - eliminates need for external supervisor IC in portable meters. |
| Bootstrapped internal supply | OUT powers internal bias circuitry - maintains regulation even as input sags to 0.8V post-startup. |
| Fixed-output architecture | No external feedback resistors required - simplifies BOM, improves production yield, and avoids resistor-tolerance-induced output drift. |
| High PFM efficiency at light loads | 85% efficiency at 100mA (3.3V mode, VIN=2.5V) - outperforms PWM regulators in intermittent-duty applications like glucose sampling. |
Applications
| Glucose Meters | Portable Data-Collection Terminals |
|---|---|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration via electrochemical test strip, requiring precise analog front-end bias and LCD backlight drive. IC Role / Device Role / Timing Role: Step-up converter generating stable 3.3V for microcontroller, ADC, and op-amps while monitoring battery health via LBI/LBO. Use Value: 25µA quiescent current extends AA/AAA battery life beyond 12 months; 125mA current limit supports pulsed 50mA LCD backlight without inductor saturation. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics, operating from 2×AA batteries with frequent wireless transmission bursts. IC Role / Device Role / Timing Role: Primary 5V rail generator for RF transceiver and imaging sensor, with LBO flag triggering low-power alert before data loss. Use Value: 0.8V start-up ensures reliable operation until battery reaches 0.9V/cell; ±1.5% reference tolerance guarantees accurate LBI threshold across temperature extremes. |
| Personal Data Communicators | Medical Instrumentation Sensors |
Use Scenario: Palm-sized PDA with monochrome display and IR/serial interface, powered by rechargeable NiMH cells with shallow discharge profile. IC Role / Device Role / Timing Role: Fixed 3.3V supply for CPU core and memory, using 3/5 pin tied to OUT; SHDN controlled by host processor for deep-sleep entry. Use Value: 1µA shutdown current prevents >1% monthly self-discharge; SO-8 package allows compact layout adjacent to MCU without thermal derating. |
Use Scenario: Wearable ECG patch transmitting biopotential signals via BLE, requiring ultra-low-noise 3.3V analog supply and battery status reporting. IC Role / Device Role / Timing Role: Isolated 3.3V rail for instrumentation amplifier and SAR ADC; REF pin supplies precision bias to analog front-end. Use Value: 0.22µF-bypassed 1.25V reference delivers <2% drift over -40°C to +85°C - enabling calibrated measurements without software compensation. |
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 output (1.8–5.5V), 1.2A switch current, 2.5µA quiescent current, integrated LDO option. | Requires external feedback resistors; higher output current suits more demanding loads but increases BOM complexity. | Choose for adjustable output or >125mA load requirements; avoid if fixed 3.3V/5V simplicity and minimal footprint are priorities. |
| LT1944ES5#TRPBF | Fixed 3.3V output only, 600mA switch current, 20µA quiescent current, requires external Schottky diode. | Lacks LBI/LBO functionality and 5V option; larger SO-8 footprint (5.0mm × 6.2mm vs. MAX858ESA+T's 3.9mm × 4.9mm). | Choose only if 3.3V-only output suffices and higher current headroom justifies added board area and missing battery monitoring. |
Compared with TPS61200DRCT and LT1944ES5#TRPBF, the MAX858ESA+T uniquely combines pin-selectable dual output, integrated low-battery detection, and sub-30µA quiescent current in a compact SO-8 package - making it optimal for space-constrained, battery-critical medical and portable instrumentation where design simplicity and long service life are mandatory.
Availability
MAX858ESA+T is available at Aetrix Electronics and suitable for glucose meters, portable data-collection terminals, personal data communicators, medical instrumentation sensors, and low-power industrial telemetry requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX858ESA+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX856–MAX859 family was designed specifically for ultra-low-power, small-footprint boost conversion in battery-operated portable medical and handheld devices - prioritizing start-up from near-dead cells, minimal quiescent draw, and integrated system supervision functions.
FAQ
What output voltages does the MAX858ESA+T support, and how are they selected?
The MAX858ESA+T supports fixed 3.3V or 5V outputs selected by the logic state of the 3/5 pin: tie to GND for 5V, tie to OUT for 3.3V. This eliminates external feedback resistors and associated tolerance errors. The MAX858ESA+T does not support adjustable output - that function belongs to the MAX857/MAX859 variants. Output accuracy is ±1.5% over temperature due to the internal 1.25V reference.
What is the minimum input voltage required to start the MAX858ESA+T, and how does it behave below that threshold?
The MAX858ESA+T starts up with a typical input voltage of 0.8V (guaranteed minimum 0.8V per datasheet). Below this, the internal N-channel sense-FET cannot turn on sufficiently to initiate switching. Once started, the device continues regulating down to 0.8V input due to bootstrapped operation - OUT supplies internal bias, decoupling startup capability from sustained operation. If VIN drops below 0.8V after startup, regulation ceases and VOUT collapses.
How does the low-battery detection (LBI/LBO) function work in the MAX858ESA+T?
The MAX858ESA+T includes an internal comparator comparing LBI voltage to a 1.25V reference. When LBI falls below 1.25V (with 25mV hysteresis), the open-drain LBO pin sinks current to GND. To set a custom threshold (e.g., 2.4V for 2-cell alkaline), connect LBI to a resistor divider from VIN to GND. LBO requires an external pull-up resistor (≥10kΩ to OUT) to generate a clean logic-high flag when battery is healthy.
What inductor value is recommended for the MAX858ESA+T, and why is the 125mA peak current limit significant?
A 47µH inductor is recommended for the MAX858ESA+T, matching its 125mA peak switch-current limit. This limit defines the maximum instantaneous inductor current before cycle-by-cycle current limiting engages. Using an inductor rated for ≥150mA saturation current prevents core saturation and maintains regulation under transient loads. Smaller inductors (e.g., 22µH) increase ripple but reduce size; larger values improve current capability at the cost of board area.
Is the MAX858ESA+T pin-compatible with other devices in the MAX856–MAX859 family, and what are the key compatibility constraints?
The MAX858ESA+T shares the same 8-pin SO package and pinout with MAX856ESA+, MAX857ESA+, and MAX859ESA+, but functional compatibility is limited. MAX856/MAX858 use the 3/5 pin for output selection; MAX857/MAX859 use FB instead. Swapping MAX858ESA+T for MAX856ESA+ is electrically safe, but substituting MAX857ESA+ requires rewiring FB and adding resistors. Always verify pin function mapping - especially 3/5 vs. FB - before replacement.
MAX858ESA+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:
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX858ESA+T FAQ
1.How can I place an order for MAX858ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX858ESA+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 MAX858ESA+T reliable?
The price and inventory of MAX858ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX858ESA+T is usually 5 days.
3.What payment methods are accepted for MAX858ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX858ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX858ESA+T?
MAX858ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX858ESA+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 MAX858ESA+T?
For technical support, including MAX858ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX858ESA+T requirements.
6.How does Aetrix verify that MAX858ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX858ESA+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 MAX858ESA+T meets industry standards.
7.What is the process for return or replacement of MAX858ESA+T?
All MAX858ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX858ESA+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 MAX858ESA+T part is unused and in its original packaging.
Return procedure for MAX858ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX858ESA+T Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
