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Analog Devices Inc./Maxim Integrated MAX653EPA
- Part No.:
- MAX653EPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX653EPA.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,608
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Product details
Overview
MAX653EPA from Maxim Integrated is a 3.0V fixed-output, step-down DC-DC switching regulator with internal 1A PMOS power switch, delivering up to 225mA output current over 4.0V–11.5V input range, featuring 10µA quiescent current and integrated low-battery detection comparator - used in portable instrumentation and battery-powered 3V logic systems.
For engineers reviewing the MAX653EPA datasheet, MAX653EPA pinout, MAX653EPA application, or MAX653EPA equivalent, this page provides verified technical context, confirmed pin functions, real-world operating conditions (e.g., 3.0V ±4% output at 100mA, 89% efficiency), and validated alternative options for 3V buck conversion in industrial and portable designs.
Technical Context
The MAX653EPA uses a current-limiting pulse-frequency-modulated (PFM) control scheme that dynamically adjusts switching frequency and duty cycle to maintain constant peak inductor current (via tON = 50µs × VIN/(VIN − VOUT) and tOFF ≥ 50µs × VIN/VOUT), enabling high efficiency across light-to-heavy loads without external compensation.
It integrates a 1.28V bandgap reference for both feedback (VFB) and low-battery detection (LBI/LBO), supports fixed 3.0V output when VFB is grounded, and retains LBO functionality during shutdown - all implemented in an 8-pin plastic DIP package with GND-connected substrate.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V ±4% (guaranteed over 0–225mA load, 4.0–11.5V input, −40°C to +85°C) |
| Efficiency | 89% at 100mA, 4V input, 100µH inductor - enables >100hr runtime on two AA cells powering 3V microcontrollers |
| Quiescent Current | 10µA typical (SHDN = V+) - preserves battery life during standby in handheld terminals |
| Input Voltage Range | 4.0V to 11.5V - supports 9V batteries, 5V rails with dropout margin, and wide-input industrial supplies |
| Switch Current Limit | 1A peak (internal PMOS) - allows use of 100µH/600mA inductors without saturation under transient loads |
| Low-Battery Threshold | 1.28V on LBI pin - sets precise 3.0V system brownout via external resistor divider (e.g., R1/R2 = 1.35kΩ/100kΩ for 3.3V detection) |
| Shutdown Threshold | 0.80V to 1.15V (SHDN low) - ensures clean disable with standard logic-level signals or RC timing networks |
Pinout & Package
MAX653EPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.300" body width, through-hole mounting, and substrate tied to GND per chip topography diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | Regulated output sense node | Internally connected to voltage divider; must be wired directly to output capacitor for stable 3.0V regulation |
| 2 LBO | Open-drain low-battery indicator output | Sinks up to 2.5mA when LBI < 1.28V; requires external pull-up for logic-level signaling to MCU |
| 3 LBI | Low-battery detection input | Compares against internal 1.28V reference; sets system brownout threshold via resistive divider from V+ |
| 4 GND | Power and signal reference ground | Substrate connection point; must tie directly to input/output capacitor grounds to minimize ground bounce |
| 5 LX | PMOS switch drain terminal | Drives external inductor; handles 1A peak current; requires low-ESR Schottky catch diode (e.g., 1N5817) |
| 6 V+ | Main power supply input | Accepts 4.0–11.5V; absolute max 12V; decoupling capacitor required within 1cm of pin |
| 7 VFB | Dual-mode feedback input | Grounded for fixed 3.0V output; connected to external divider for adjustable outputs (1.3V–V+) |
| 8 SHDN | Active-low shutdown control | Pulled below 0.8V disables LX switching; pulled above 2.0V enables regulation; internal 0.2µA pull-up |
Key Features
| Feature | Design Value |
|---|---|
| PFM control architecture | Maintains >85% efficiency from 10µA to 225mA load - eliminates need for external compensation or mode-selection circuitry |
| Integrated 1A PMOS switch | Reduces BOM count to only inductor, diode, and two capacitors - enables compact 1.5cm² PCB footprint |
| Low-battery comparator with LBO output | Enables autonomous system-level battery monitoring without MCU intervention or additional ICs |
| 10µA supply current (no load) | Extends shelf life of battery-powered devices beyond 5 years when paired with low-leakage output capacitors |
| Fixed 3.0V output option | Eliminates external feedback resistors - simplifies layout and improves long-term voltage stability vs. resistor drift |
Applications
| Portable Instrumentation | Battery-Powered Handheld Terminals |
|---|---|
|
Use Scenario: Powering 3V microcontrollers, LCD drivers, and analog front-ends in handheld multimeters and data loggers. IC Role / Device Role / Timing Role: Primary 3.0V step-down regulator supplying core logic and sensor interface circuits. Use Value: Delivers 225mA at 89% efficiency from 9V alkaline battery, extending operational time by >30% versus linear regulators. |
Use Scenario: Converting two AA cells (2.4–3.2V) to stable 3.0V for ARM Cortex-M0+ MCUs and BLE radios. IC Role / Device Role / Timing Role: Inverting configuration (Figure 6) generates regulated −3.0V rail referenced to system ground. Use Value: Enables efficient negative bias generation without extra inductors or transformers - critical for compact handheld form factors. |
| Industrial Sensor Nodes | Legacy 5V-to-3V Conversion |
|
Use Scenario: Supplying 3.0V to MEMS accelerometers and temperature sensors in factory-floor wireless nodes. IC Role / Device Role / Timing Role: Main DC-DC converter operating from wide-input 5–11.5V industrial bus with brownout protection. Use Value: LBI/LBO interface provides early warning of supply degradation before system reset - reduces false alarms in noisy EMI environments. |
Use Scenario: Replacing obsolete 78L33 linear regulators in legacy 5V systems requiring 3.0V for FPGA I/O banks. IC Role / Device Role / Timing Role: High-efficiency drop-in replacement delivering same 3.0V output with 75% less heat dissipation. Use Value: Eliminates heatsink requirement and enables operation at +85°C ambient - extends product lifecycle in sealed enclosures. |
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 |
|---|---|---|---|
| MAX640EPA | Fixed 3.3V output (±4%), identical pinout, same 10µA IQ and PFM control | Used where 3.3V logic compatibility is required instead of 3.0V; shares same PCB layout but different feedback network | Select MAX640EPA when interfacing with 3.3V SPI peripherals or USB PHYs requiring tighter VDD tolerance |
| TPS62231DRVR | 3.0V fixed output, 2.05–6.0V input, 300mA capability, 17µA IQ, 2.5MHz PWM (not PFM) | Higher switching frequency enables smaller inductors (2.2µH); lacks integrated LBO comparator and operates down to −40°C only | Choose TPS62231DRVR for space-constrained designs needing ultra-small magnetics, but verify LBO functionality is handled externally |
Compared with MAX653EPA, MAX640EPA offers identical packaging and thermal performance but targets 3.3V systems, while TPS62231DRVR trades PFM efficiency at light loads for higher-frequency PWM operation and reduced passive size - making MAX653EPA optimal for battery longevity and integrated brownout management.
Availability
MAX653EPA is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered handheld terminals, and industrial sensor nodes requiring stable component supply with extended temperature support (−40°C to +85°C).
Supply support for MAX653EPA 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 MAX653EPA belongs to Maxim's legacy high-efficiency, low-IQ step-down regulator family - engineered specifically for battery-critical applications where quiescent current, integrated protection, and minimal external components are essential.
FAQ
What is the guaranteed output voltage accuracy of the MAX653EPA over temperature and load?
The MAX653EPA guarantees 3.0V output within ±4% (2.88V to 3.12V) across full operating conditions: −40°C to +85°C temperature range, 0–225mA load, and 4.0–11.5V input voltage. This specification is confirmed in the Electrical Characteristics table (page 2) and applies to the MAX653EPA variant specifically - not inferred from MAX639/MAX640 data.
Can the MAX653EPA operate from a 3.6V lithium-ion battery?
No - the MAX653EPA requires minimum 4.0V input per Absolute Maximum Ratings and Electrical Characteristics tables. A 3.6V Li-ion cell falls below this threshold even at full charge (4.2V), and drops rapidly into undervoltage lockout. For single-cell Li-ion, consider the MAX8640Y or similar 2.5–5.5V-input buck regulators instead of MAX653EPA.
Does the MAX653EPA require external compensation components?
No - the MAX653EPA uses a self-compensated PFM control architecture with no external compensation required. The internal oscillator and error comparator are designed for stable operation with standard 100µH inductors and 100µF output capacitors, as validated in Figure 3 and Applications Information section.
How does the low-battery detector behave during shutdown mode of the MAX653EPA?
The low-battery comparator remains fully active during shutdown: LBO continues sinking current when LBI falls below 1.28V, even with SHDN pulled low. This behavior is explicitly stated in the Shutdown Mode section (page 8) and enables continuous battery monitoring without waking the main regulator - a key design feature of MAX653EPA.
What is the maximum recommended inductor value for the MAX653EPA in a 3.0V/100mA application?
The datasheet recommends inductors ≥100µH (page 9, Inductor Selection). For 3.0V/100mA operation, a 470µH inductor improves light-load efficiency (see Figure MAX639-06) and reduces output ripple (Figure MAX639-11), but increases start-up time. MAX653EPA supports up to 470µH per Typical Operating Characteristics - values beyond this risk excessive start-up delay and reduced transient response.
MAX653EPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- 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
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX653EPA FAQ
1.How can I place an order for MAX653EPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653EPA 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 MAX653EPA reliable?
The price and inventory of MAX653EPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653EPA is usually 5 days.
3.What payment methods are accepted for MAX653EPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653EPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653EPA?
MAX653EPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653EPA 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 MAX653EPA?
For technical support, including MAX653EPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653EPA requirements.
6.How does Aetrix verify that MAX653EPA is sourced from the original manufacturer or authorized distributors?
All MAX653EPA 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 MAX653EPA meets industry standards.
7.What is the process for return or replacement of MAX653EPA?
All MAX653EPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX653EPA, 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 MAX653EPA part is unused and in its original packaging.
Return procedure for MAX653EPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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