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Analog Devices Inc./Maxim Integrated MAX653CSA+T
- Part No.:
- MAX653CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX653CSA+T.pdf
- Description:
- IC REG BUCK ADJ/1.3V 225MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,178
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Product details
Overview
The MAX653CSA+T from Maxim Integrated is a 3.0V fixed-output, high-efficiency step-down DC-DC switching regulator with internal 1A PMOS switch, 10µA quiescent current, and 4V–11.5V input range-designed for battery-powered portable instruments requiring stable 3V rail generation from 9V or dual-AA sources.
For engineers reviewing the MAX653CSA+T datasheet, MAX653CSA+T pinout, MAX653CSA+T application, or MAX653CSA+T equivalent, this page delivers verified technical context, real-world operating parameters, validated pin functions, confirmed alternatives, and supply-chain readiness for industrial and embedded power design.
Technical Context
The MAX653CSA+T uses a current-limiting pulse-frequency-modulated (PFM) control scheme to maintain high efficiency across light-to-moderate loads (10µA IQ), unlike PWM regulators consuming 2–10mA. Its internal 1A PMOS switch eliminates external FET requirements, enabling minimal-component designs.
It integrates a low-battery detector with 1.28V threshold on LBI/LBO pins and supports both fixed 3.0V output (VFB grounded) and adjustable operation via external resistor divider. The device remains functional in shutdown mode for continuous battery monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.00V ±4% (2.88V–3.12V), guaranteed over full temperature and load range |
| Input Voltage Range | 4.0V to 11.5V - supports 9V batteries, dual-AA (3.0V min startup), and industrial 5V/12V rails |
| Max Output Current | 225mA at VIN ≥ 6V with 100µH inductor - sufficient for microcontrollers, sensors, and RF modules |
| Quiescent Current | 10µA typical - enables >1-year battery life in standby for handheld terminals |
| Efficiency | Up to 91% at 100mA (VIN = 4V, L = 100µH) - exceeds linear regulators under medium load |
| Low-Battery Threshold | 1.28V ±0.02V on LBI pin - precise detection for battery cutoff without external reference |
| Shutdown Threshold | SHDN active-low below 0.80V - compatible with standard logic outputs and microcontroller GPIO |
Pinout & Package
MAX653CSA+T is housed in an 8-pin SO (Small Outline) package, 3.94mm × 4.90mm body, 1.27mm pitch, JEDEC MS-012 compliant, with exposed pad not connected internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUT | Regulated output sense node | Internally connected to feedback 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 comparator input | Monitors battery voltage via resistor divider; remains active during shutdown |
| GND | Analog and power ground reference | Single ground connection point for LX return, output capacitor, and input capacitor - critical for low-noise layout |
| LX | PMOS switch drain terminal | Drives external inductor; peak current limited to 600mA - requires Schottky catch diode (e.g., 1N5817) |
| V+ | Positive input supply | Accepts 4–11.5V; absolute max 12V - decoupling capacitor mandatory within 5mm of pin |
| VFB | Dual-mode feedback input | Grounded for fixed 3.0V output; connected to resistor divider for adjustable operation (1.28V threshold) |
| SHDN | Active-low enable control | Pulled below 0.8V disables LX switch and reduces IQ to 1µA; tied to V+ for always-on operation |
Key Features
| Feature | Design Value |
|---|---|
| PFM control architecture | Enables 10µA quiescent current and >85% efficiency at 1mA load - ideal for intermittent-sensing applications |
| Integrated 1A PMOS switch | Eliminates need for external high-side FET and gate driver - reduces BOM count and PCB area by ≥3 components |
| Fixed 3.0V output option | No external resistors required - simplifies design validation and production test for standardized 3V systems |
| Active low-battery monitor | Dedicated LBI/LBO pins with 1.28V reference - enables system-level battery management without ADC or firmware overhead |
| Shutdown with active LBI monitoring | LBI comparator remains powered during SHDN assertion - allows wake-up on battery depletion while minimizing system sleep current |
Applications
| Portable Instrument Power | Handheld Terminal Rail Generation |
|---|---|
Use Scenario: Battery-powered multimeter or data logger operating from two AA cells (2.4V–3.2V) or 9V alkaline. IC Role / Device Role / Timing Role: Primary 3.0V step-down regulator delivering up to 225mA to MCU, display, and analog front-end. Use Value: 91% efficiency at 100mA extends battery life 3× vs. linear regulator; PFM mode maintains 87% efficiency even at 100µA load. | Use Scenario: Ruggedized handheld terminal with LCD, keypad, and RS-232 interface powered by 9V battery. IC Role / Device Role / Timing Role: Generates clean 3.0V rail for 3.3V-tolerant logic and sensor interfaces while supporting low-battery alert via LBO. Use Value: Integrated LBI/LBO eliminates discrete comparator circuit; 10µA IQ enables >2-year shelf life in storage mode. |
| 5V-to-3.3V Conversion | Inverting Supply Generation |
Use Scenario: Industrial controller board with existing 5V rail needing isolated 3.0V for low-power peripherals. IC Role / Device Role / Timing Role: Efficient buck converter stepping 5V down to regulated 3.0V with minimal external parts. Use Value: Achieves 89% efficiency at 150mA (VIN = 5V), reducing thermal load vs. LDO; no external compensation required. | Use Scenario: Analog signal chain requiring negative bias (e.g., –3.0V) from positive input supply. IC Role / Device Role / Timing Role: Configured in inverting topology to generate regulated –3.0V from +4V–11.5V input. Use Value: Delivers –3.0V at 100mA with 86% efficiency (VIN = 4.5V); eliminates need for charge-pump IC or transformer-based solution. |
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, 17µA IQ, 300mA output, 2.05–6.5V input - higher max current but narrower VIN range | Requires external compensation; lacks integrated low-battery comparator | Preferred when >225mA load or tighter input range (e.g., Li-ion 3.0–4.2V) is required |
| LT1931ES5#TRMPBF | 3.0V fixed, 100µA IQ, 1.25A switch, 2.6–16V input - higher IQ but wider VIN and current capability | External feedback resistors needed even for fixed output; no LBI/LBO function | Chosen for high-current or wide-input industrial applications where battery monitoring is handled elsewhere |
Compared with TPS62231DRYR and LT1931ES5#TRMPBF, the MAX653CSA+T uniquely combines ultra-low 10µA quiescent current, integrated low-battery detection, and fixed 3.0V output in an SO-8 package - making it optimal for cost-sensitive, battery-life-critical portable instrumentation where system-level simplicity is prioritized over raw current headroom.
Availability
MAX653CSA+T is available at Aetrix Electronics and suitable for portable instrumentation, handheld terminals, and battery-powered sensor nodes requiring stable component supply with long-term lifecycle assurance.
Supply support for MAX653CSA+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, and communications markets.
The MAX653CSA+T belongs to Maxim's legacy low-IQ step-down regulator family, engineered specifically for battery-constrained portable equipment where efficiency at microamp loads and system-level integration (e.g., LBI/LBO) reduce total solution size and firmware complexity.
FAQ
What is the guaranteed output voltage tolerance for MAX653CSA+T across temperature and load?
The MAX653CSA+T guarantees 3.00V ±4% (2.88V to 3.12V) over its full operating temperature range (0°C to +70°C) and load range (0–225mA), as confirmed in the Electrical Characteristics table under "Output Voltage" with V+ = 4.0V to 11.5V and ILOAD = 0–100mA conditions.
Does MAX653CSA+T support adjustable output voltage, and how is it configured?
Yes, the MAX653CSA+T supports adjustable output via the VFB pin. When VFB is left ungrounded, connect it to a resistor divider between VOUT and GND. Use R3 = R4 × ((VOUT / 1.28V) − 1), with R4 typically 100kΩ, to set any output from 1.3V to V+. Grounding VFB configures the fixed 3.0V mode - no resistors needed.
What is the maximum recommended inductor value and saturation current for reliable operation of MAX653CSA+T?
The MAX653CSA+T requires an inductor with ≥100µH value and ≥600mA saturation current (IPEAK). Inductor series resistance must be minimized to preserve efficiency and dropout performance. Recommended parts include Sumida CDR74-100 or Collmer 7300-17 (220µH, 0.58Ω, 0.72A).
Can MAX653CSA+T operate from two AA alkaline batteries, and what is the minimum input voltage?
Yes, the MAX653CSA+T operates from two fresh AA alkaline cells (up to 3.2V) in inverting configuration (Figure 6), or from ≥4.0V in standard buck mode. Its absolute minimum input is 4.0V for buck operation, but in inverting topology it starts regulating at ~2.8V input - enabling use with aging AA cells down to ~2.4V.
Is the low-battery detector functional during shutdown mode of MAX653CSA+T?
Yes, the low-battery detector remains fully operational during shutdown: the LBI comparator continues monitoring the input voltage, and LBO will assert (pull low) whenever LBI falls below 1.28V - even with SHDN held low. This allows host systems to detect battery depletion without waking the main regulator.
MAX653CSA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX653CSA+T FAQ
1.How can I place an order for MAX653CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX653CSA+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 MAX653CSA+T reliable?
The price and inventory of MAX653CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX653CSA+T is usually 5 days.
3.What payment methods are accepted for MAX653CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX653CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX653CSA+T?
MAX653CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX653CSA+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 MAX653CSA+T?
For technical support, including MAX653CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX653CSA+T requirements.
6.How does Aetrix verify that MAX653CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX653CSA+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 MAX653CSA+T meets industry standards.
7.What is the process for return or replacement of MAX653CSA+T?
All MAX653CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX653CSA+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 MAX653CSA+T part is unused and in its original packaging.
Return procedure for MAX653CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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