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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:2,808
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Product details
Overview
MAX653CPA+ from Maxim Integrated is a 3V fixed-output, high-efficiency step-down DC-DC switching regulator with internal 1A PMOS power switch, 10µA quiescent current, 4V–11.5V input range, and up to 225mA output current. It integrates low-battery detection (1.28V threshold) and operates in pulse-frequency-modulated (PFM) mode for ultra-low IQ performance in portable 9V-to-3V conversion.
For engineers reviewing the MAX653CPA+ datasheet, MAX653CPA+ pinout, MAX653CPA+ application, or MAX653CPA+ equivalent, key selection criteria include its preset 3.0V output, 8-pin plastic DIP package, -40°C to +85°C industrial temperature range, and compatibility with standard 100µH inductors and Schottky diodes in minimal-component buck topologies.
Technical Context
The MAX653CPA+ uses a current-limiting 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 light to medium loads. Its internal 1A PMOS switch eliminates external drive circuitry.
It features dual-mode feedback: grounding VFB selects the factory-trimmed 3.0V output (±4% over temperature), while an external resistor divider enables adjustable operation. The low-battery comparator (LBI/LBO) remains active during shutdown and references the same 1.28V bandgap as VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.00V ±4% (guaranteed over 0mA–100mA, TA = –40°C to +85°C) |
| Input Voltage Range | 4.0V to 11.5V - supports 9V battery, 5V rail, or unregulated adapter inputs |
| Quiescent Current | 10µA typical - enables >1-year battery life in always-on 9V-powered sensors |
| Max Output Current | 225mA at VIN ≥ 6V with 100µH inductor - sufficient for microcontrollers, RF modules, and analog front-ends |
| Efficiency | 89% at 100mA, VIN = 4V, L = 100µH - exceeds linear regulators by >40% at medium load |
| Low-Battery Threshold | 1.28V ±20mV on LBI - allows precise battery end-of-life detection with external resistor divider |
| Shutdown Threshold | SHDN < 0.8V (active low) - ensures clean disable with TTL/CMOS logic interface |
Pinout & Package
MAX653CPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.300" wide body and 0.100" lead pitch, rated for industrial temperature range (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output sense node | Internally connected to voltage 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 detector input | High-impedance input (2nA bias); sets battery cutoff via R1/R2 divider referenced to 1.28V |
| GND | Power and signal reference | Must be star-connected with CIN, COUT, and diode anode to minimize ground bounce |
| LX | PMOS switch drain | Drives external inductor; peak current limited to 600mA; requires Schottky catch diode |
| V+ | Positive supply input | Accepts 4V–11.5V; absolute max 12V; decoupling capacitor required within 1cm |
| VFB | Dual-mode feedback pin | Grounded for 3.0V fixed output; connected to resistor divider for adjustable mode (VFB = 1.28V) |
| SHDN | Active-low shutdown control | Pulled below 0.8V disables LX; pulled above 2.0V enables regulation; 0.2µA pull-up current |
Key Features
| Feature | Design Value |
|---|---|
| Pulse-frequency modulation (PFM) | Enables 10µA no-load IQ while maintaining >85% efficiency at 10mA load - critical for battery longevity |
| Integrated 1A PMOS power switch | Eliminates external MOSFET and gate driver, reducing BOM count and PCB area in space-constrained designs |
| Factory-trimmed 3.0V output | Guaranteed ±4% accuracy over full temperature and line/load range - removes need for post-assembly calibration |
| Active low-battery comparator | Independent 1.28V reference shared with VFB enables accurate, low-power battery monitoring without extra IC |
| Shutdown mode with zero output current | Reduces total system standby power to sub-µA level; LBO remains functional for wake-up triggering |
Applications
| Portable Instrument Power | Industrial Sensor Node |
|---|---|
Use Scenario: Handheld multimeter powered by two 9V alkaline batteries requiring stable 3.0V for MCU and analog front-end. IC Role / Device Role / Timing Role: Primary 9V-to-3V step-down regulator with integrated low-battery warning to trigger display alert before cutoff. Use Value: 89% efficiency at 100mA extends battery life beyond 200 hours; 10µA quiescent current prevents drain during sleep mode. | Use Scenario: Wireless temperature sensor node using 9V battery and LoRa transceiver needing regulated 3.0V at intermittent 150mA peaks. IC Role / Device Role / Timing Role: High-efficiency buck converter supplying burst-mode power to RF IC; LBO triggers firmware-initiated shutdown at 6.2V battery voltage. Use Value: PFM control maintains >85% efficiency from 1mA to 200mA, minimizing thermal rise in sealed enclosure. |
| Legacy System Voltage Translation | Low-Power Microcontroller Supply |
Use Scenario: Retrofitting 5V legacy industrial controller with 3.0V FPGA I/O bank requiring clean, low-noise supply. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter replacing inefficient 78L05 + LDO cascade; provides 3.0V at 200mA with <100mV ripple. Use Value: Eliminates 2W heat dissipation from linear solution; 100µH/1N5817 design fits existing footprint. | Use Scenario: Battery-powered environmental monitor with ARM Cortex-M0+ MCU, ADC, and BLE radio operating at 3.0V. IC Role / Device Role / Timing Role: Main system power regulator with SHDN controlled by MCU GPIO to gate power during deep-sleep cycles. Use Value: Shutdown leakage <1µA enables multi-year operation on single 9V battery; fast start-up (<5ms) meets BLE wake timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRYR | 3.0V fixed, 17µA IQ, 300mA output, 2.05–6.0V input, 6-pin WSON | Lower input voltage ceiling (6V max) limits 9V battery use; higher output current suits more demanding loads | Select for compact SMT layouts where 9V input is not required and >225mA load current is needed |
| LT1930ES5#TRMPBF | 3.0V fixed, 2.5mA IQ, 300mA output, 3.5–25V input, 5-pin SOT-23 | Higher quiescent current reduces battery life; wider input range supports 12V systems | Select when input voltage may exceed 11.5V or when SOT-23 footprint is mandatory despite IQ penalty |
Compared with TPS62231DRYR and LT1930ES5#TRMPBF, the MAX653CPA+ delivers superior battery runtime in 9V-powered devices due to its 10µA IQ and 11.5V input rating, while its DIP package simplifies prototyping and repair - though it trades off board space versus modern SMT alternatives.
Availability
MAX653CPA+ is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor nodes, legacy voltage translation, and low-power microcontroller supply applications requiring stable component supply and long-term manufacturability.
Supply support for MAX653CPA+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX653CPA+ belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family designed specifically for battery-powered portable equipment where extended runtime and minimal external components are critical.
FAQ
What is the guaranteed output voltage tolerance for MAX653CPA+ across temperature and load?
The MAX653CPA+ guarantees a 3.00V output with ±4% tolerance over the full industrial temperature range (–40°C to +85°C) and load current from 0mA to 100mA, as confirmed in the Electrical Characteristics table under "Output Voltage" for MAX653. This specification is validated by correlation to switch on-resistance, timing parameters, and trip-point measurements per datasheet Note 2.
Can MAX653CPA+ operate from a single 3.7V Li-ion cell?
No, MAX653CPA+ cannot operate from a single 3.7V Li-ion cell because its minimum input voltage is 4.0V per Absolute Maximum Ratings and Electrical Characteristics tables. Attempting to power it below 4.0V will result in dropout and loss of regulation. For Li-ion applications, consider the MAX653ESA variant with lower VIN min or alternative regulators like the MAX1722.
What is the recommended inductor value and saturation current for MAX653CPA+ at 200mA load?
For 200mA continuous output, Maxim recommends a 100µH inductor with ≥600mA saturation current (IPEAK = 4 × IOUTMAX per Applications Information). Inductor series resistance must be minimized to maintain efficiency and prevent excessive dropout at low input voltages - typical values are <0.5Ω for 100µH parts such as Sumida CDR74 or Coilcraft DO5022P.
Does MAX653CPA+ support adjustable output voltage, and how is it configured?
Yes, MAX653CPA+ supports adjustable output via the VFB pin. To configure: disconnect VFB from GND and connect it to the center tap of an external resistor divider between VOUT and GND. Use R3 = R4 × ((VOUT/1.28V) – 1), with R4 selected between 10kΩ and 1MΩ (100kΩ typical). The IC retains all specifications including low-battery detection and shutdown functionality in adjustable mode.
How does the low-battery detector behave during shutdown mode of MAX653CPA+?
The low-battery detector remains fully active during shutdown mode of MAX653CPA+. When SHDN is pulled low, the LX switch disables and VOUT collapses, but the internal 1.28V reference and LBI comparator continue operating. LBO will sink current if LBI falls below 1.28V, enabling battery monitoring and wake-up capability even when the main regulator is disabled - a key feature for energy-harvesting and ultra-low-power systems.
MAX653CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 (TA)
- 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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