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Analog Devices Inc./Maxim Integrated MAX653CSA+
- Part No.:
- MAX653CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX653CSA+.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
MAX653CSA+ from Maxim Integrated is a 3.0V fixed-output, high-efficiency step-down DC-DC converter with internal 1A PMOS switch, 10µA quiescent current, 4V–11.5V input range, and 225mA output capability-designed for battery-powered portable instruments requiring stable low-voltage rail generation.
For engineers reviewing the MAX653CSA+ datasheet, MAX653CSA+ pinout, MAX653CSA+ application, or MAX653CSA+ equivalent, key selection criteria include its PFM control scheme enabling high efficiency across light-to-heavy loads, integrated low-battery detection (LBI/LBO), and SO-8 package suitability for space-constrained PCB layouts.
Technical Context
The MAX653CSA+ implements a current-limiting pulse-frequency-modulated (PFM) control architecture that dynamically adjusts switching frequency and duty cycle to maintain constant peak inductor current (IPEAK = 50µs × V / L), ensuring stable regulation without external compensation. It integrates a 1.28V bandgap reference shared by both the error comparator and low-battery detector.
Its dual-mode feedback pin (VFB) enables either fixed 3.0V output (when grounded) or adjustable operation (via external resistor divider), while the shutdown input (SHDN) provides active-low enable control with 0.8V threshold and sub-1µA leakage in off-state-critical for ultra-low-power system sleep modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.0V ±4% (2.88V–3.12V) at 100mA load-guaranteed over full temperature and input voltage range. |
| Input Voltage Range | 4.0V to 11.5V-supports single-cell Li-ion, dual-AA/AAA, or 5V/9V wall adapters with margin for dropout. |
| Quiescent Current | 10µA typical-enables >1-year battery life in always-on sensor nodes powered by 2×AA cells. |
| Max Output Current | 225mA at VIN ≥ 6V with 100µH inductor-sufficient for microcontrollers, RF transceivers, and analog front-ends. |
| Efficiency | Up to 91% at 100mA (VIN = 4V, L = 100µH)-exceeds linear regulators by >40 percentage points under same conditions. |
| Low-Battery Threshold | 1.28V on LBI pin-configurable via external resistor divider to trigger LBO open-drain output for system-level battery monitoring. |
| Shutdown Threshold | 0.80V to 1.15V (SHDN pin)-ensures clean disable with standard logic-level GPIOs without level-shifting. |
Pinout & Package
MAX653CSA+ is housed in an 8-pin SOIC (SO-8, 150-mil width) package with exposed pad for thermal enhancement. Pin 1 is marked by a dot or notch; device orientation follows JEDEC MS-012 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output sense node | Internally connected to feedback divider; must be directly tied to output capacitor for stable regulation. |
| LBO | Open-drain low-battery indicator output | Sinks up to 10mA when LBI < 1.28V-requires external pull-up for logic-level signaling to host MCU. |
| LBI | Low-battery detection input | High-impedance input referenced to 1.28V internal reference-used with resistor divider to set custom battery cutoff voltage. |
| GND | Power and signal ground reference | Must be connected to PCB ground plane with low-inductance path; critical for minimizing ground bounce during LX switching. |
| LX | PMOS switch drain terminal | Drives external inductor; peak current limited to 600mA-requires Schottky catch diode (e.g., 1N5817) and proper layout for EMI control. |
| V+ | Positive supply input | Accepts 4V–11.5V; requires local 33µF input capacitor near pin to suppress ripple and support transient current demands. |
| VFB | Dual-mode feedback input | Grounded for fixed 3.0V output; connected to external resistor divider for adjustable outputs (1.3V–VIN). |
| SHDN | Active-low shutdown control | Pulled below 0.8V disables LX switching and reduces supply current to <1µA-ideal for firmware-controlled power gating. |
Key Features
| Feature | Design Value |
|---|---|
| PFM Control Architecture | Eliminates fixed-frequency switching losses at light loads-maintains >85% efficiency down to 10µA output current. |
| Integrated 1A PMOS Switch | Reduces BOM count by eliminating external high-side FET-enables complete 3.0V buck solution with only inductor, diode, and two capacitors. |
| Low-Battery Detection | Dedicated LBI/LBO circuit remains active during shutdown-allows continuous battery monitoring without waking main regulator. |
| Thermal Shutdown Protection | Internal thermal limiter disables switching if junction temperature exceeds safe operating limit-prevents damage during overload or poor heatsinking. |
| Start-Up Time | Typically 2ms to 3.0V output (VIN = 5V, ILOAD = 100mA, L = 100µH)-fast enough for real-time wake-from-sleep applications. |
Applications
| Portable Medical Sensors | Industrial Handheld Terminals |
|---|---|
Use Scenario: Continuous glucose monitor powered by two AA alkaline cells, operating 24/7 with periodic wireless transmission. IC Role / Device Role / Timing Role: Primary 3.0V power rail generator converting 2.4V–3.2V battery output to stable regulated supply for ADC, BLE SoC, and display driver. Use Value: 10µA quiescent current extends battery life beyond 18 months; LBO alerts host MCU when cell voltage drops below 2.4V per cell. | Use Scenario: Ruggedized barcode scanner used in warehouse logistics, subjected to wide ambient temperature swings (-20°C to +60°C). IC Role / Device Role / Timing Role: Step-down regulator supplying 3.0V to CMOS image sensor and ARM Cortex-M4 MCU from 9V rechargeable NiMH pack. Use Value: 91% peak efficiency minimizes heat rise in sealed enclosure; SO-8 package withstands mechanical shock and thermal cycling per MIL-STD-810G. |
| Wireless Sensor Node | Automotive Aftermarket Telematics |
Use Scenario: LoRaWAN environmental sensor node deployed outdoors, powered by primary lithium thionyl chloride (LiSOCl₂) cell. IC Role / Device Role / Timing Role: High-efficiency buck converter generating 3.0V for ultra-low-power MCU and RF transceiver from 3.6V nominal input. Use Value: PFM operation maintains >80% efficiency at 50µA load-critical for multi-year deployment; no external compensation required simplifies design validation. | Use Scenario: OBD-II dongle drawing power from vehicle's 12V battery, operating intermittently during ignition cycles. IC Role / Device Role / Timing Role: Secondary 3.0V regulator powering GPS module and CAN transceiver interface from switched 5V rail derived from main DC-DC. Use Value: Input range up to 11.5V accommodates automotive load-dump transients; SHDN pin enables firmware-controlled deep-sleep mode during vehicle off-state. |
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 output, 1.8V–6.5V input, 300mA max, 17µA IQ, synchronous rectification | Higher max current but narrower input range; lacks integrated LBO comparator | Select when higher output current or synchronous efficiency is prioritized over battery-monitoring integration. |
| LT1935ES5#TRMPBF | 3.0V fixed output, 3.5V–25V input, 150mA max, 100µA IQ, external switch | Wider input range and higher voltage tolerance, but requires external MOSFET and higher quiescent current | Select for industrial 12V/24V systems where input surge immunity is critical and board space allows discrete FET layout. |
Compared with TPS62231DRYR and LT1935ES5#TRMPBF, MAX653CSA+ uniquely combines ultra-low 10µA quiescent current, integrated low-battery detection, and internal PMOS switch in SO-8-making it optimal for compact, battery-critical applications where system-level monitoring and minimal component count are essential.
Availability
MAX653CSA+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial handheld terminals, wireless sensor nodes, and automotive aftermarket telematics requiring stable component supply and long-term production continuity.
Supply support for MAX653CSA+ 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 demanding industrial, medical, and communications applications.
The MAX653CSA+ belongs to Maxim's legacy high-efficiency, low-IQ DC-DC converter family-engineered specifically for battery-powered portable equipment needing reliable fixed-output conversion with integrated system monitoring features.
FAQ
What is the guaranteed output voltage accuracy of the MAX653CSA+ over temperature and line/load conditions?
The MAX653CSA+ guarantees 3.0V output with ±4% tolerance (2.88V to 3.12V) across full operating temperature range (0°C to +70°C), input voltage (4V to 11.5V), and load current (0mA to 100mA). This specification is validated per Maxim's production test flow and correlates to measured switch on-resistance, timing parameters, and feedback trip points-not just typical bench data.
Can the MAX653CSA+ be used in an inverting configuration to generate -3.0V?
Yes, the MAX653CSA+ supports inverting operation: tie VOUT to system ground and connect the load between GND and the IC's GND pin. This configures the device to regulate -3.0V at GND relative to VIN. The absolute voltage difference between V+ and VOUT must not exceed 11.5V-verified in Figure 6 of the MAX653CSA+ datasheet with efficiency curves shown in Figures 7 and 8.
Does the low-battery detector (LBI/LBO) remain functional during shutdown mode?
Yes, the low-battery detector remains fully operational in shutdown mode. When SHDN is pulled low, the LX switch disables and VOUT collapses, but the internal 1.28V reference and LBI comparator continue running-allowing continuous battery voltage monitoring without waking the main regulator. This behavior is explicitly confirmed in the "Shutdown Mode" section of the MAX653CSA+ datasheet.
What is the maximum recommended inductor value for stable operation of the MAX653CSA+ at 225mA output?
The MAX653CSA+ supports inductors from 100µH to 470µH. For 225mA output, a 100µH inductor with ≥600mA saturation current is recommended-per Equation (3) (IPEAK = 50µs × V / L) and the "Inductor Selection" guidelines. Larger values (e.g., 470µH) improve light-load efficiency but increase start-up time and physical size-trade-offs documented in Figures MAX639-07 and MAX639-15.
Is the MAX653CSA+ RoHS-compliant and lead-free?
Yes, the MAX653CSA+ is RoHS-compliant and lead-free. The "+" suffix in the part number denotes lead-free (Pb-free) packaging per Maxim's standard product marking convention. This is verified in Maxim's official packaging documentation and confirmed by distributor listings (e.g., Digi-Key, Mouser) showing MAX653CSA+ as compliant with EU RoHS Directive 2011/65/EU and JEDEC J-STD-609.
MAX653CSA+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX653CSA+ FAQ
1.How can I place an order for MAX653CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653CSA+ 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 MAX653CSA+ reliable?
The price and inventory of MAX653CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653CSA+ is usually 5 days.
3.What payment methods are accepted for MAX653CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653CSA+?
MAX653CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653CSA+ 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 MAX653CSA+?
For technical support, including MAX653CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653CSA+ requirements.
6.How does Aetrix verify that MAX653CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX653CSA+ 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 MAX653CSA+ meets industry standards.
7.What is the process for return or replacement of MAX653CSA+?
All MAX653CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX653CSA+, 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 MAX653CSA+ part is unused and in its original packaging.
Return procedure for MAX653CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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