My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX757ESA
- Part No.:
- MAX757ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX757ESA.pdf
- Description:
- IC REG BOOST ADJ 300MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,953
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX757ESA from Maxim Integrated is an adjustable-output, step-up DC-DC converter IC designed for low-input-voltage battery-powered systems. It operates from as low as 0.7V input, delivers 2.7V to 5.5V output (set via external resistor divider), achieves >87% efficiency at 200mA load, and features 60µA quiescent current and integrated low-battery detection (LBI/LBO). It is used in glucose meters and portable medical instrumentation where compact size and ultra-low startup voltage are critical.
For engineers reviewing the MAX757ESA datasheet, MAX757ESA pinout, MAX757ESA application, or MAX757ESA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature, real-world design meaning of FB/REF/LBI/LBO terminals, and two field-validated alternative parts with documented functional trade-offs.
Technical Context
The MAX757ESA implements a constant-off-time pulse-frequency modulation (PFM) control scheme with no oscillator, enabling variable switching frequency up to 500kHz and ultra-low 20µA shutdown current. Its internal 1A/0.5Ω N-channel MOSFET switch and bootstrapped gate drive allow reliable start-up below 1.1V input after initial regulation.
It integrates a precision 1.25V ±1.5% reference (250µA source / 20µA sink), a low-battery comparator with 1.25V threshold and 25mV hysteresis, and feedback (FB) input for adjustable output configuration - all functional during shutdown. The device requires no external compensation and supports direct connection of REF to 0.22µF bypass capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.7V minimum start-up; 0.7V to VOUT–VD continuous operation (supports 2-cell alkaline or single LiFePO4). |
| Output Voltage Range | 2.7V to 5.5V, set by external R1/R2 divider on FB pin (VOUT = 1.25V × (R1+R2)/R2). |
| Switching Frequency | Up to 500kHz (load- and input-dependent); enables use of small 22µH surface-mount inductors <5mm diameter. |
| Quiescent Current | 60µA typical at no load; ensures multi-year battery life in standby mode for portable diagnostics. |
| Reference Voltage | 1.25V ±1.5% over –40°C to +85°C; stable enough to directly power ADC references without additional buffering. |
| Low-Battery Threshold | 1.25V ±25mV hysteresis on LBI pin; allows precise battery end-of-life detection with external resistor divider. |
| Efficiency | >87% typical at 200mA load (VIN=2.5V → VOUT=5V); reduces thermal stress and extends runtime in space-constrained enclosures. |
Pinout & Package
MAX757ESA is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant. GND (pin 7) must be soldered directly to a low-impedance ground plane to minimize noise and maximize efficiency.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Shutdown control input | Active-low logic input; pulls internal regulator offline while keeping REF and LBI comparator active (20µA shutdown current). |
| 2 FB | Feedback input | Connects to voltage divider between OUT and GND; sets output voltage via 1.25V reference (max 100nA bias current). |
| 3 REF | Precision reference output | 1.25V ±1.5% output; supplies up to 250µA; requires 0.22µF ceramic bypass to GND when loaded. |
| 4 LBO | Low-battery open-drain output | Sinks current when LBI < 1.25V; requires external pull-up (≥10kΩ to VOUT) for CMOS-compatible flag signaling. |
| 5 LBI | Low-battery input | Comparator input referenced to internal 1.25V; connect to VIN via resistor divider to set custom battery threshold. |
| 6 OUT | Regulated output | Main power output node; also supplies bootstrapped gate drive for internal MOSFET; connects to output capacitor (100µF typical). |
| 7 GND | Power ground | Primary return path for switch current and load; must be low-impedance and directly connected to PCB ground plane. |
| 8 LX | Switch node | Drain of internal 1A/0.5Ω N-MOSFET; connects to inductor and Schottky diode anode; high di/dt node requiring short trace routing. |
Key Features
| Feature | Design Value |
|---|---|
| 0.7V Minimum Start-Up Voltage | Enables operation from deeply discharged 2-cell alkaline or NiMH batteries without external wake-up circuitry. |
| Integrated Low-Battery Detector | Eliminates need for external supervisor IC; LBI/LBO pair provides configurable, temperature-stable battery monitoring. |
| 60µA Quiescent Supply Current | Extends shelf life and operational runtime in intermittent-use devices like handheld glucose meters and PDAs. |
| Adjustable Output via FB Pin | Supports flexible system-level voltage scaling (e.g., 3.3V for logic, 5V for sensors) using only two standard resistors. |
| Bootstrapped Gate Drive | Uses OUT voltage to drive internal MOSFET gate, enabling efficient regulation even when VIN drops below 1V post-startup. |
Applications
| Glucose Meters | Portable Medical Sensors |
|---|---|
|
Use Scenario: Battery-powered handheld device measuring blood glucose concentration with electrochemical sensor and LCD display. IC Role / Device Role / Timing Role: Step-up DC-DC converter providing stable 3.3V for MCU and 5V for sensor bias and analog front-end. Use Value: Enables single 2-cell alkaline operation with >1000 tests per battery set due to 0.7V start-up and 60µA quiescent current. |
Use Scenario: Compact wearable oximeter or ECG patch requiring regulated power from coin-cell or thin-film battery. IC Role / Device Role / Timing Role: Primary voltage booster delivering 3.3V to RF transceiver and 5V to analog signal chain under dynamic load. Use Value: Maintains regulation down to 0.8V input during battery sag, avoiding brownout resets during peak transmission bursts. |
| Palmtop Computers | Handheld Data Collectors |
|
Use Scenario: Legacy palmtop PDA with flash memory, touch screen, and serial interface powered by 3×AAA batteries. IC Role / Device Role / Timing Role: Adjustable-output boost converter supplying 3.3V I/O and 5V peripheral bus from declining battery stack. Use Value: Eliminates need for separate 3.3V/5V regulators; FB pin allows software-selectable voltage modes via GPIO-controlled resistor network. |
Use Scenario: Ruggedized barcode scanner used in warehouse logistics with intermittent high-current laser and imager loads. IC Role / Device Role / Timing Role: High-efficiency boost stage powering 5V imaging sensor and 3.3V microcontroller from 2-cell NiMH pack. Use Value: >87% efficiency at 200mA sustains >8-hour runtime; LBO output triggers low-power mode before battery depletion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable-output step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61200DRCT | Fixed 3.3V/5V options only; no FB pin for true adjustability; higher 100µA quiescent current; 0.3V min start-up (lower than MAX757ESA). | Lacks programmable output - unsuitable where system requires 4.2V or other non-standard rail; better for fixed-rail cost-sensitive designs. | Select TPS61200DRCT only if output voltage is fixed and lowest possible start-up voltage (0.3V) is prioritized over adjustability and quiescent current. |
| LT1944ES5#TRPBF | Higher 1.2MHz switching frequency; requires external compensation; 100µA quiescent current; no integrated LBI/LBO detector. | Needs external components for stability and battery monitoring; smaller inductor but higher EMI risk; less integrated for portable medical use. | Choose LT1944ES5#TRPBF when board area is constrained and 1.2MHz operation justifies added design complexity and missing supervision features. |
Compared with MAX757ESA, TPS61200DRCT offers lower start-up voltage but sacrifices output flexibility and efficiency, while LT1944ES5#TRPBF delivers higher frequency and smaller magnetics at the cost of added external components and no built-in battery monitoring - making MAX757ESA optimal for integrated, low-power, adjustable-rail medical and portable applications.
Availability
MAX757ESA is available at Aetrix Electronics and suitable for glucose meters, portable medical sensors, palmtop computers, handheld data collectors, and battery-powered diagnostic equipment requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX757ESA 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 consumer applications.
The MAX757ESA belongs to Maxim's legacy low-voltage step-up DC-DC converter product line, engineered specifically for battery-powered portable instrumentation where ultra-low start-up voltage, integrated supervision, and minimal quiescent current are essential.
FAQ
What is the minimum input voltage required for MAX757ESA to start regulation?
The MAX757ESA requires a minimum of 0.7V at VIN to initiate regulation. Once started, it continues operating down to approximately 0.8V under load, supported by bootstrapped gate drive from the OUT pin. This capability enables reliable use with aging alkaline or NiMH cells in devices like glucose meters where battery voltage sags significantly during discharge. The MAX757ESA datasheet confirms this value across –40°C to +85°C.
How is the output voltage set on the MAX757ESA?
The MAX757ESA output voltage is set externally using a resistor divider between OUT and GND, connected to the FB pin. The formula is VOUT = 1.25V × (R1 + R2) / R2, where R2 connects FB to GND. Typical values range from 10kΩ to 200kΩ to minimize error from FB's 100nA input bias current. This configuration gives full 2.7V–5.5V adjustability - unlike the pin-strapped MAX756 - and is validated in the MAX757ESA typical application circuit.
Does the MAX757ESA include low-battery detection, and how is it configured?
Yes, the MAX757ESA integrates a precision low-battery detector with LBI (input) and LBO (open-drain output) pins. The detector compares LBI voltage to an internal 1.25V reference. To configure the threshold, connect LBI to VIN through a resistor divider (R3/R4); the equation is R3 = [(VIN / 1.25V) – 1] × R4. LBO sinks current when the threshold is crossed, and both LBI comparator and REF remain active in shutdown mode - a key feature confirmed in the MAX757ESA electrical characteristics table.
What package type and footprint does the MAX757ESA use?
The MAX757ESA uses an 8-pin SO (Small Outline) package, JEDEC MS-012AC compliant, with 1.27mm lead pitch, 3.9mm × 4.9mm body size, and 1.75mm max height. Its pinout matches the MAX756ESA but substitutes FB for the 3/5 select pin. The GND pin (7) must be soldered directly to a solid ground plane per layout guidelines in the MAX757ESA datasheet to ensure stability and thermal performance.
Can the MAX757ESA operate efficiently at light loads, and what is its quiescent current?
Yes, the MAX757ESA maintains high efficiency at light loads due to its constant-off-time PFM control architecture, which reduces switching frequency under low current. Its quiescent supply current is 60µA typical (measured at VIN), and it drops to 20µA in shutdown mode - with REF and LBI comparator still active. This behavior is measured and specified across the full –40°C to +85°C range, making it ideal for intermittently powered portable instruments where standby current directly impacts battery life.
MAX757ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 0.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 2.7V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 300mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX757ESA FAQ
1.How can I place an order for MAX757ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX757ESA 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 MAX757ESA reliable?
The price and inventory of MAX757ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX757ESA is usually 5 days.
3.What payment methods are accepted for MAX757ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX757ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX757ESA?
MAX757ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX757ESA 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 MAX757ESA?
For technical support, including MAX757ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX757ESA requirements.
6.How does Aetrix verify that MAX757ESA is sourced from the original manufacturer or authorized distributors?
All MAX757ESA 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 MAX757ESA meets industry standards.
7.What is the process for return or replacement of MAX757ESA?
All MAX757ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX757ESA, 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 MAX757ESA part is unused and in its original packaging.
Return procedure for MAX757ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX757ESA 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…
