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Analog Devices Inc./Maxim Integrated MAX653ESA+
- Part No.:
- MAX653ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX653ESA+.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:855
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Product details
Overview
MAX653ESA+ from Maxim Integrated is a 3.0V fixed-output, high-efficiency step-down DC-DC converter with PFM control, delivering up to 225mA output current, 10µA quiescent supply current, and operating from 4.0V to 11.5V input. It integrates a 1A PMOS power switch and features a low-battery detector (1.28V threshold) for portable battery-powered systems.
For engineers reviewing the MAX653ESA+ datasheet, MAX653ESA+ pinout, MAX653ESA+ application, or MAX653ESA+ equivalent, key selection criteria include its 3.0V preset output, -40°C to +85°C industrial temperature range in 8-pin SO package, low-noise PFM operation at light loads, and compatibility with standard 100µH inductors and Schottky diodes in compact DC-DC designs.
Technical Context
The MAX653ESA+ employs a current-limiting pulse-frequency-modulated (PFM) control scheme that dynamically adjusts switching frequency and duty cycle to maintain constant peak inductor current (IPEAK = 50µs × VIN/L), enabling high efficiency across load currents from 10µA to 225mA. Its internal 1.28V bandgap reference serves both the error comparator (via VFB) and low-battery comparator (via LBI).
It operates in two feedback modes: fixed 3.0V output when VFB is grounded, or adjustable output using an external resistor divider referenced to the 1.28V VFB threshold. The LX pin drives an external inductor-diode network, while SHDN provides active-low shutdown with <2.0V threshold and LBO offers open-drain low-battery indication independent of shutdown state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.00V ±4% (2.88V–3.12V) - tightly regulated without external resistors |
| Input Voltage Range | 4.0V to 11.5V - supports single-cell Li-ion, dual-AA/AAA, or 5V/9V rail inputs |
| Max Output Current | 225mA at VIN ≥ 5.5V with 100µH inductor - sufficient for microcontrollers, sensors, and RF modules |
| Quiescent Supply Current | 10µA typical - enables >1-year battery life in always-on monitoring applications |
| Efficiency | 85%–89% at 100mA (VIN = 4V–9V, L = 100µH) - exceeds linear regulators under medium loads |
| Low-Battery Threshold | 1.28V ±2% on LBI pin - configurable detection voltage via external resistor divider |
| Shutdown Threshold | 0.80V to 1.15V (SHDN low) - ensures clean disable with margin against noise |
Pinout & Package
MAX653ESA+ 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 a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output sense node | Internally connected to feedback divider; must be tied directly to output capacitor for stable regulation |
| LBO | Open-drain low-battery output | Sinks up to 10mA when LBI < 1.28V; requires external pull-up for logic-level signaling |
| LBI | Low-battery input | High-impedance comparator input; sets battery depletion point via R1/R2 divider |
| GND | Power and signal ground reference | Common return for VOUT, LBO, LBI, VFB, SHDN; must be star-connected to minimize ground bounce |
| LX | PMOS switch drain terminal | Drives external inductor; switches between V+ and GND; peak current limited to 600mA |
| V+ | Positive input supply | Accepts 4.0V–11.5V; must be decoupled with ≥33µF low-ESR capacitor near pin |
| VFB | Dual-mode feedback input | Grounded for 3.0V fixed output; connected to resistor divider for adjustable outputs (1.3V–V+) |
| SHDN | Active-low enable/disable control | Pulled below 0.8V disables LX switching and reduces supply current to <1µA |
Key Features
| Feature | Design Value |
|---|---|
| PFM control architecture | Maintains >85% efficiency from 10µA to full 225mA load - eliminates light-load inefficiency of PWM |
| Integrated 1A PMOS switch | Eliminates need for external MOSFET and gate driver - reduces BOM count and PCB area |
| Low-battery detector with independent operation | Remains functional during SHDN mode - enables system-level battery monitoring without regulator wake-up |
| Fixed 3.0V output option | No external resistors required - simplifies design and improves production yield for standardized 3.3V/3.0V logic rails |
| Wide input voltage range (4.0V–11.5V) | Supports direct connection to unregulated battery stacks or legacy 5V/9V supplies - avoids pre-regulation stage |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered wearable ECG sensor operating continuously for 12+ months on two AA cells. IC Role / Device Role / Timing Role: Primary 3.0V power supply for ultra-low-power MCU, analog front-end, and BLE radio. Use Value: 10µA quiescent current extends battery life; PFM efficiency preserves runtime across discharge curve; LBO alerts host before brownout. |
Use Scenario: Remote environmental monitor deployed in harsh outdoor locations with wide temperature swings. IC Role / Device Role / Timing Role: Regulated 3.0V source for microcontroller, temperature/humidity sensor, and LoRa transceiver. Use Value: -40°C to +85°C SO package rating ensures reliability; 4.0V–11.5V input accommodates solar-charged LiFePO₄ batteries; low dropout maintains regulation down to 3.5V. |
| Handheld Test Equipment | Smart Metering Modules |
|
Use Scenario: Pocket-sized multimeter with LCD display, precision ADC, and USB charging interface. IC Role / Device Role / Timing Role: Efficient 3.0V rail generation from 5V USB or internal alkaline battery pack. Use Value: High efficiency (>87% at 100mA) minimizes thermal rise in sealed enclosure; SHDN enables instant power-off with zero standby drain. |
Use Scenario: Electricity meter with real-time clock, metrology ASIC, and PLC communication subsystem. IC Role / Device Role / Timing Role: Dedicated 3.0V supply for RTC and backup memory, isolated from noisy main power domain. Use Value: Low-noise PFM operation prevents switching artifacts from coupling into precision metrology circuits; LBI/LBO supports tamper-detection battery monitoring. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3.0V fixed, 300mA output, 2.05V–6.5V input, 17µA IQ, 2.5MHz PWM | Higher switching frequency enables smaller inductors/caps but increases EMI sensitivity; no integrated low-battery detector | Choose for space-constrained designs needing higher current and tighter output tolerance (±1%), but add external battery monitor if required |
| LT1931ES5#TRMPBF | Adjustable 1.25V–30V, 1.3A switch, 4.5V–36V input, 100µA IQ, PFM/PWM hybrid | Wider input range and higher current capability; significantly higher quiescent current limits battery life in always-on use | Choose for industrial systems with unstable input rails >12V or requiring >225mA, but avoid in long-life battery applications due to 10× higher IQ |
Compared with TPS62231DRYR and LT1931ES5#TRMPBF, the MAX653ESA+ delivers superior battery longevity via ultra-low 10µA IQ and built-in low-battery monitoring-making it optimal for cost-sensitive, long-duration portable devices where 225mA output suffices and EMI constraints favor sub-MHz switching.
Availability
MAX653ESA+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test equipment, and smart metering modules requiring stable component supply with guaranteed long-term availability.
Supply support for MAX653ESA+ 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 MAX653ESA+ belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family designed specifically for battery-powered instrumentation and portable electronics where extended runtime and minimal external components are critical.
FAQ
What is the output voltage tolerance of the MAX653ESA+?
The MAX653ESA+ provides a fixed 3.0V output with ±4% tolerance (2.88V to 3.12V) over full temperature and load range, verified per Electrical Characteristics table on page 2 of the datasheet. This specification applies when VFB is grounded and uses the internal feedback divider - no external resistors affect this tolerance.
Can the MAX653ESA+ operate from a single 3.7V Li-ion cell?
No - the MAX653ESA+ requires a minimum input voltage of 4.0V per Absolute Maximum Ratings and Electrical Characteristics tables. A discharged 3.7V Li-ion cell falling below 4.0V will cause dropout and regulation loss. For single-cell Li-ion, consider the MAX863 or similar 2.7V-startup converters.
Does the MAX653ESA+ require an external Schottky diode?
Yes - the MAX653ESA+ requires an external Schottky diode (e.g., 1N5817) connected between LX and VOUT to complete the buck converter path. The IC integrates only the PMOS high-side switch; the diode provides the freewheeling path during switch-off time and must handle peak currents up to 600mA.
How does the low-battery detector behave during shutdown?
The low-battery detector remains fully operational during SHDN mode: LBI continues sampling the input voltage, and LBO actively sinks current when LBI drops below 1.28V. This allows continuous battery monitoring without waking the regulator - a key feature confirmed in the Shutdown Mode section on page 8 of the datasheet.
What inductor value is recommended for maximum efficiency with the MAX653ESA+?
A 100µH inductor with ≥600mA saturation current is recommended for maximum output current (225mA), while a 470µH inductor improves light-load efficiency and reduces output ripple - as shown in Figures MAX639-05 through MAX639-06. Inductor series resistance must be minimized to maintain regulation at low input voltages.
MAX653ESA+ 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-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 11.5V
- Voltage - Output (Min/Fixed):
- 1.3V (3V)
- Voltage - Output (Max):
- 11.5V
- Current - Output:
- 225mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX653ESA+ FAQ
1.How can I place an order for MAX653ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653ESA+ 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 MAX653ESA+ reliable?
The price and inventory of MAX653ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653ESA+ is usually 5 days.
3.What payment methods are accepted for MAX653ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653ESA+?
MAX653ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653ESA+ 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 MAX653ESA+?
For technical support, including MAX653ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653ESA+ requirements.
6.How does Aetrix verify that MAX653ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX653ESA+ 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 MAX653ESA+ meets industry standards.
7.What is the process for return or replacement of MAX653ESA+?
All MAX653ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX653ESA+, 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 MAX653ESA+ part is unused and in its original packaging.
Return procedure for MAX653ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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