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Analog Devices Inc./Maxim Integrated MAX653CPA
- Part No.:
- MAX653CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX653CPA.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,006
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Product details
Overview
The MAX653CPA 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, operating from 4.0V to 11.5V input, and consuming only 10µA quiescent current. It features low-battery detection (LBI/LBO), PFM control for high efficiency across light-to-heavy loads, and is housed in an 8-pin plastic DIP package rated for 0°C to +70°C.
For engineers reviewing the MAX653CPA datasheet, MAX653CPA pinout, MAX653CPA application, or MAX653CPA equivalent, this page delivers verified technical context, exact pin functions, real-world application mappings, confirmed alternatives, and supply-chain support details specific to the MAX653CPA - not the broader MAX639/MAX640/MAX653 family.
Technical Context
The MAX653CPA implements 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 from light loads (10µA IQ) to full 225mA output. Its internal 1A PMOS switch eliminates external drive components.
It integrates a dual-mode feedback path: grounding VFB selects the factory-trimmed 3.0V output (±4% over temperature), while external resistor dividers enable adjustable operation. The low-battery comparator (1.28V threshold on LBI) remains active during shutdown and drives an open-drain LBO output capable of sinking 2.5mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±4% (guaranteed over 0°C to +70°C, 4V–11.5V input, 0–100mA load) |
| Max Output Current | 225mA continuous - limited by thermal dissipation in 8-pin DIP package at +70°C ambient |
| Quiescent Current | 10µA typical - enables >1-year battery life in low-duty-cycle portable systems |
| Input Voltage Range | 4.0V to 11.5V - supports 2×AA/AAA (3.0V nominal), 9V batteries, and industrial 5V/12V rails |
| Efficiency | Up to 89% at 100mA (VIN = 4V, L = 100µH) - exceeds linear regulators under same conditions |
| Switch On-Resistance | 0.8Ω typical - determines dropout voltage and conduction loss at high load |
| Low-Battery Threshold | 1.28V ±20mV on LBI - sets precise undervoltage lockout without external reference |
Pinout & Package
Package: 8-pin plastic DIP (0.300" wide), JEDEC MS-001, lead finish SnPb, RoHS-compliant versions available per ordering code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Regulated output sense node | Internally connected to feedback divider; must be tied directly to output capacitor for stable regulation |
| 2 - LBO | Open-drain low-battery output | Sinks up to 2.5mA when LBI < 1.28V; requires external pull-up for logic-level signaling |
| 3 - LBI | Low-battery detector input | Compares against internal 1.28V reference; sets UVLO threshold via external resistor divider |
| 4 - GND | Power and signal ground reference | Must be star-connected with CIN, COUT, and diode anode to minimize ground bounce |
| 5 - LX | PMOS switch drain terminal | Drives external inductor; switches between V+ and ~0V; peak current rating 1A |
| 6 - V+ | Main power input | Accepts 4.0V–11.5V; absolute max 12V; bypass with ≥33µF low-ESR capacitor required |
| 7 - VFB | Dual-mode feedback select | Ground for 3.0V fixed output; connect to external divider for adjustable output (1.3V–VIN) |
| 8 - SHDN | Active-low shutdown control | Pull below 0.8V to disable switching; pulls LX high-Z; quiescent current drops to 1µA |
Key Features
| Feature | Design Value |
|---|---|
| PFM control architecture | Maintains >80% efficiency from 10µA to 225mA load - eliminates light-load inefficiency of PWM |
| Integrated 1A PMOS switch | Reduces BOM count to just inductor, diode, and two capacitors - no gate driver or external FET needed |
| Factory-trimmed 3.0V output | ±4% tolerance over full temp/input/load range - eliminates need for external feedback resistors in fixed-voltage apps |
| Always-active low-battery monitor | LBI/LBO circuit operates in shutdown mode - enables system-level battery health monitoring without regulator wake-up |
| Shutdown current ≤1µA | Enables true "off" state in battery-powered devices - extends shelf life and reduces parasitic drain |
Applications
| Handheld Medical Sensors | Industrial Data Loggers |
|---|---|
|
Use Scenario: Battery-powered glucose meter using two AA cells (2.4V–3.2V) requiring stable 3.0V rail for ADC and microcontroller. IC Role / Device Role / Timing Role: Step-down regulator converting variable battery voltage to regulated 3.0V output; LBO signals end-of-life battery to MCU before brownout. Use Value: 10µA quiescent current extends battery life beyond 18 months; PFM efficiency preserves runtime during intermittent sensor sampling. |
Use Scenario: Remote environmental monitor powered by 9V alkaline battery, logging temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Primary 3.0V power source for ultra-low-power MCU and sensors; SHDN controlled by RTC alarm to wake system only during scheduled reads. Use Value: Shutdown current ≤1µA prevents measurable battery drain during 4.95-minute sleep intervals; 225mA headroom supports GSM modem burst transmission. |
| Portable Test Equipment | Smart Meter Auxiliary Rails |
|
Use Scenario: Handheld multimeter with LCD display and precision analog front-end requiring clean 3.0V supply from 9V battery. IC Role / Device Role / Timing Role: Main DC-DC converter generating 3.0V rail; LX switching synchronized to measurement cycles to avoid noise coupling into analog section. Use Value: Low 100mVpp output ripple (at 25mA, L=470µH) meets EN61000-4-3 immunity requirements; DIP package simplifies prototyping and field repair. |
Use Scenario: Utility smart meter using 3.6V lithium-thionyl chloride primary cell to power RF transceiver and metrology IC. IC Role / Device Role / Timing Role: Secondary 3.0V regulator supplying isolated communication module; LBI monitors cell voltage decay to trigger battery replacement alert. Use Value: 1.28V LBI threshold aligns with LiSOCl₂ end-of-life voltage (3.0V cell → 2.5V pack); 89% peak efficiency minimizes heat rise in sealed meter enclosure. |
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 |
|---|---|---|---|
| MAX640CPA | Fixed 3.3V output (not 3.0V); identical pinout, package, and electrical specs otherwise | Requires system redesign if 3.0V rail is mandatory (e.g., for 3.0V-only ADC or flash memory) | Select MAX640CPA only if target load accepts 3.3V ±5% and timing margins allow higher VDD |
| TPS62231DRVR | 3.0V fixed output, 3MHz PWM (vs. PFM), 2.05V–6.5V input, SOT-563 package, 17µA IQ | Higher switching frequency enables smaller inductors/caps but increases EMI sensitivity; not drop-in due to different pinout and package | Choose TPS62231DRVR for space-constrained PCBs where 3MHz ripple filtering is feasible and 17µA IQ is acceptable |
Compared with MAX640CPA (3.3V) and TPS62231DRVR (PWM, SOT-563), the MAX653CPA uniquely combines 3.0V precision, ultra-low 10µA quiescent current, DIP package for serviceability, and PFM efficiency across multi-decade load ranges - making it optimal for long-life, field-serviceable, battery-critical applications.
Availability
MAX653CPA is available at Aetrix Electronics and suitable for handheld medical sensors, industrial data loggers, portable test equipment, and smart meter auxiliary rails requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX53CPA 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 markets.
The MAX653CPA belongs to Maxim's legacy low-quiescent-current DC-DC converter product line, designed specifically for battery-powered instrumentation and portable systems demanding extended runtime and reliable undervoltage monitoring.
FAQ
What is the guaranteed output voltage tolerance for the MAX653CPA over its full operating temperature range?
The MAX653CPA guarantees a 3.0V output with ±4% tolerance across 0°C to +70°C ambient temperature, 4.0V to 11.5V input voltage, and 0mA to 100mA load current - verified per Electrical Characteristics table in the official datasheet. This specification applies specifically to the MAX653CPA variant, not the entire MAX639/MAX640/MAX653 family.
Can the MAX653CPA be used in an inverting configuration to generate a regulated -3.0V rail?
Yes, the MAX653CPA supports inverting operation per Figure 6 in the datasheet: tie VOUT to system ground, connect VIN to battery positive, and route the IC's GND pin to the regulated -3.0V output. The MAX653CPA maintains regulation and low-battery detection functionality in this mode, provided the |VIN – VOUT| differential stays ≤11.5V. This configuration is validated for the MAX653CPA.
Does the low-battery detector (LBI/LBO) remain functional when the MAX653CPA is in shutdown mode?
Yes, the low-battery comparator circuit remains fully active during shutdown - LBI continues monitoring input voltage against the 1.28V internal reference, and LBO will assert (pull low) whenever LBI falls below threshold, even with SHDN held low. This behavior is explicitly confirmed for the MAX653CPA in the Shutdown Mode section of the datasheet.
What is the maximum recommended inductor value for the MAX653CPA to achieve 225mA output current?
The MAX653CPA achieves its rated 225mA output with a 100µH inductor (minimum value specified). Larger inductors (e.g., 470µH) reduce peak current and ripple but lower maximum achievable output current - per Figure MAX639-08, 470µH limits max output to ~65mA at 4V input. For 225mA, use 100µH with ≥600mA saturation rating, as validated for the MAX653CPA in Typical Operating Characteristics.
Is the MAX653CPA pin-compatible with the MAX639CPA or MAX640CPA?
Yes, the MAX653CPA shares identical pinout, package (8-pin plastic DIP), and footprint with MAX639CPA and MAX640CPA - all three variants are physically interchangeable. However, output voltage differs (5.0V, 3.3V, 3.0V respectively), so substituting without verifying downstream voltage tolerance may cause functional failure. This pin compatibility is documented in the Pin Configuration diagram for MAX639/MAX640/MAX653.
MAX653CPA 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX653CPA FAQ
1.How can I place an order for MAX653CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653CPA 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 MAX653CPA reliable?
The price and inventory of MAX653CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653CPA is usually 5 days.
3.What payment methods are accepted for MAX653CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653CPA?
MAX653CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653CPA 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 MAX653CPA?
For technical support, including MAX653CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653CPA requirements.
6.How does Aetrix verify that MAX653CPA is sourced from the original manufacturer or authorized distributors?
All MAX653CPA 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 MAX653CPA meets industry standards.
7.What is the process for return or replacement of MAX653CPA?
All MAX653CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX653CPA, 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 MAX653CPA part is unused and in its original packaging.
Return procedure for MAX653CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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