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Analog Devices Inc./Maxim Integrated MAX653ESA+T
- Part No.:
- MAX653ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX653ESA+T.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,162
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Product details
Overview
MAX653ESA+T from Maxim Integrated is a 3.0V fixed-output, high-efficiency step-down DC-DC switching regulator with PFM control, delivering up to 225mA output current, 10µA quiescent supply current, and operating from 4.0V to 11.5V input voltage. It integrates a 1A PMOS power switch and features a low-battery detector (LBI/LBO) for portable battery-powered systems.
For engineers reviewing the MAX653ESA+T datasheet, MAX653ESA+T pinout, MAX653ESA+T application, or MAX653ESA+T equivalent, key selection considerations include its 3.0V preset output, -40°C to +85°C industrial temperature range in 8-pin SO package, PFM efficiency at light loads, and compatibility with standard 100µH inductors and Schottky diodes in compact DC-DC designs.
Technical Context
The MAX653ESA+T uses 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 feeds both the error comparator (for regulation) and the low-battery comparator (LBI/LBO).
Operation relies on variable on-time (tON = 50µs × VIN/(VIN − VOUT)) and minimum off-time (tOFF ≥ 50µs × VIN/VOUT) to sustain zero-current switching and minimize losses. The LX pin drives an external inductor-diode output stage, while VFB grounding selects the factory-trimmed 3.0V output without external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±4% (2.88V–3.12V), factory-trimmed via internal resistor divider; no external components required for nominal operation. |
| Input Voltage Range | 4.0V to 11.5V - supports common battery stacks (e.g., 3×AA, 3×AAA, 9V) and intermediate rail conversion. |
| Max Output Current | 225mA at VIN ≥ 5.5V and L = 100µH - sufficient for microcontrollers, sensors, and RF modules in portable devices. |
| Quiescent Supply Current | 10µA typical (SHDN = V+, no load) - enables multi-year battery life in always-on monitoring applications. |
| Efficiency | Up to 91% at 100mA load (VIN = 4V, L = 100µH) - exceeds linear regulators under medium-to-heavy loads while avoiding thermal derating. |
| Low-Battery Detection | LBI threshold = 1.28V ±2%, LBO open-drain sink capable of 2.5mA - allows system-level brownout warning with external resistor divider. |
| Operating Temperature | -40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
Pinout & Package
MAX653ESA+T 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 (Pin 1) | Regulated output sense node | Internally connected to feedback divider; must be tied directly to output capacitor for stable regulation. |
| LBO (Pin 2) | Low-battery open-drain output | Sinks current when LBI < 1.28V; requires external pull-up for logic-level interface to MCU or supervisor. |
| LBI (Pin 3) | Low-battery comparator input | Monitors battery voltage via external resistor divider; remains active during shutdown mode. |
| GND (Pin 4) | Power and signal reference | Must be connected to PCB ground plane at single-point star node near CIN, COUT, and diode anode to minimize ground bounce. |
| LX (Pin 5) | PMOS switch drain | Drives external inductor; switches between VIN and ~0V; peak current rating limited to 600mA by internal switch. |
| V+ (Pin 6) | Positive supply input | Accepts 4.0V–11.5V; requires local 33µF–100µF low-ESR input capacitor placed within 5mm of pin. |
| VFB (Pin 7) | Dual-mode feedback input | Grounded for 3.0V fixed output; connected to external divider for adjustable outputs (1.3V–VIN). |
| SHDN (Pin 8) | Active-low enable input | Pulled below 0.8V disables regulator (LX high-Z); pulled above 2.0V enables operation; internal 0.2µA pull-up if left floating. |
Key Features
| Feature | Design Value |
|---|---|
| PFM control architecture | Enables 10µA quiescent current and >85% efficiency at 10µA–1mA loads - critical for battery longevity in IoT edge nodes. |
| Integrated 1A PMOS switch | Eliminates need for external high-side FET and gate driver - reduces BOM count and layout area in space-constrained designs. |
| Factory-trimmed 3.0V output | Guaranteed ±4% accuracy over full temperature and line/load range - removes calibration burden in production test. |
| Independent low-battery monitor | LBI/LBO circuit operates continuously, including during SHDN mode - supports wake-on-battery-alert functionality without main regulator activation. |
| Zero-current switching | Ensures inductor current fully discharges each cycle - minimizes switching losses and EMI compared to forced-PWM topologies. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitor powered by two AA alkaline cells (2.4V–3.2V), requiring regulated 3.0V for analog front-end and BLE radio. IC Role / Device Role / Timing Role: Primary 3.0V step-down regulator with integrated LBI monitoring to trigger low-power alert before battery depletion. Use Value: 10µA quiescent current extends battery life beyond 2 years; PFM efficiency maintains >80% at 50µA sensor bias current. | Use Scenario: Ruggedized environmental logger deployed in remote field locations, powered by 9V battery or 5V USB, needing stable 3.0V for microcontroller and SD card interface. IC Role / Device Role / Timing Role: Main power converter with shutdown control for sleep/wake cycles and LBO-driven early-warning flag for maintenance scheduling. Use Value: -40°C to +85°C rating ensures reliable startup in outdoor enclosures; 225mA output supports simultaneous ADC sampling and wireless transmission bursts. |
| Handheld Test Instruments | Smart Home Sensor Hubs |
Use Scenario: Battery-operated multimeter using three AAA cells (3.6V–4.5V), requiring precise 3.0V rail for 16-bit ADC reference and display backlight driver. IC Role / Device Role / Timing Role: High-accuracy DC-DC regulator with minimal output ripple (<15mV p-p at 100mA) to preserve measurement integrity. Use Value: Fixed 3.0V output eliminates resistor tolerance errors; 91% peak efficiency reduces thermal rise in sealed plastic housing. | Use Scenario: Zigbee/Z-Wave hub powered by 5V wall adapter, converting to 3.0V for MCU, RF transceiver, and multiple I²C sensors. IC Role / Device Role / Timing Role: Compact, low-noise power supply with fast transient response (<1ms recovery from 0→100mA load step) to prevent RF lockup during packet transmission. Use Value: SO-8 footprint fits dense 2-layer PCBs; LBO pin enables firmware-based battery backup detection when primary supply fails. |
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, 17µA IQ, PWM-only control (no PFM), 2.05V–6.5V input | Higher output current but higher light-load IQ; lacks low-battery comparator; requires external soft-start capacitor | Select when higher current or tighter output regulation (±1%) is needed, and battery monitoring is handled externally. |
| RT8059GJ6 | 3.0V fixed, 300mA output, 22µA IQ, PFM/PWM auto-switching, 2.5V–5.5V input | Narrower input range excludes 9V battery use; no dedicated LBI/LBO pins; smaller 6-pin WDFN package | Select for ultra-compact designs where 9V input is unnecessary and board space is constrained. |
Compared with TPS62231DRYR and RT8059GJ6, the MAX653ESA+T uniquely combines 3.0V fixed output, 10µA quiescent current, integrated low-battery detection, and 4V–11.5V input support - making it optimal for long-life, battery-backed industrial and portable systems requiring autonomous voltage monitoring.
Availability
MAX653ESA+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, handheld test instruments, and smart home sensor hubs requiring stable component supply with guaranteed long-term availability.
Supply support for MAX653ESA+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, automotive, communications, and computing markets.
The MAX653ESA+T belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family designed specifically for battery-powered portable equipment where extended runtime and autonomous power monitoring are critical design requirements.
FAQ
What is the guaranteed output voltage accuracy of the MAX653ESA+T over temperature and load?
The MAX653ESA+T guarantees a 3.0V output with ±4% tolerance (2.88V to 3.12V) across the full -40°C to +85°C operating temperature range and for output currents from 0mA to 225mA. This specification is verified per the Electrical Characteristics table in the official datasheet, with typical deviation less than ±1.5% at room temperature and mid-load conditions. The MAX653ESA+T achieves this via factory laser-trimming of its internal feedback resistor divider.
Can the MAX653ESA+T be used in an inverting configuration to generate a negative output voltage?
Yes, the MAX653ESA+T supports inverting operation: connect the VOUT pin to system ground, tie the load between GND and LX, and route the output filter capacitor from LX to ground. This configuration generates a regulated -3.0V output referenced to the original input ground. The MAX653ESA+T datasheet Figure 6 confirms this topology, specifying maximum |VIN − VOUT| ≤ 11.5V - so a 5.5V input yields -3.0V output safely. Efficiency remains >84% at 10mA load with 470µH inductor.
Does the low-battery detector (LBI/LBO) remain functional during shutdown mode of the MAX653ESA+T?
Yes, the LBI/LBO circuit remains fully operational when the MAX653ESA+T is in shutdown mode (SHDN < 0.8V). The internal 1.28V reference and comparator continue drawing only ~0.1µA, allowing continuous battery voltage monitoring without activating the main regulator. This enables wake-up-on-low-battery functionality in ultra-low-power systems - a confirmed feature documented in the "Shutdown Mode" section of the MAX653ESA+T datasheet.
What is the recommended inductor value and saturation current rating for the MAX653ESA+T at 225mA maximum output?
For 225mA maximum output, Maxim recommends a 100µH inductor with ≥600mA saturation current rating (e.g., Sumida CDR74-100 or equivalent). This satisfies Equation (3): IPEAK = 50µs × VIN/L ≈ 600mA at VIN = 11.5V. Inductor series resistance must be ≤ 0.3Ω to limit dropout and maintain efficiency. Using <100µH risks switch current limiting and reduced output capability - a requirement explicitly stated in Note 1 of the MAX653ESA+T datasheet.
Is the MAX653ESA+T pin-compatible with other members of the MAX639/MAX640/MAX653 family?
Yes, the MAX653ESA+T shares identical pinout, package (8-pin SO), and terminal functions with the MAX639ESA+T and MAX640ESA+T. All three devices use the same VOUT/LBO/LBI/GND/LX/V+/VFB/SHDN assignment and electrical interface. The only functional difference is the factory-set output voltage (5.0V, 3.3V, or 3.0V), selectable solely by part number - enabling drop-in replacement in designs where output voltage is adjusted via BOM change rather than layout revision.
MAX653ESA+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-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+T FAQ
1.How can I place an order for MAX653ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653ESA+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 MAX653ESA+T reliable?
The price and inventory of MAX653ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653ESA+T is usually 5 days.
3.What payment methods are accepted for MAX653ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653ESA+T?
MAX653ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653ESA+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 MAX653ESA+T?
For technical support, including MAX653ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653ESA+T requirements.
6.How does Aetrix verify that MAX653ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX653ESA+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 MAX653ESA+T meets industry standards.
7.What is the process for return or replacement of MAX653ESA+T?
All MAX653ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX653ESA+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 MAX653ESA+T part is unused and in its original packaging.
Return procedure for MAX653ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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