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Analog Devices Inc./Maxim Integrated MAXM17903AMB+T
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- Part No.:
- MAXM17903AMB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- DC DC Converters
- Package:
- 10-SMD Module
- Datasheet:
-
MAXM17903AMB+T.pdf
- Description:
- DC DC CONVERTER 0.9-5V
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
The MAXM17903AMB+T from Maxim Integrated is a Himalaya-series synchronous step-down DC-DC power module with integrated controller, MOSFETs, compensation, and inductor. It operates from 4.5V to 24V input, delivers up to 300mA output current, supports adjustable 0.9V–5V output voltage, features ±1.5% feedback accuracy, and employs peak-current-mode control for stable regulation in industrial sensor and battery-powered point-of-load applications.
For engineers reviewing the MAXM17903AMB+T datasheet, MAXM17903AMB+T pinout, MAXM17903AMB+T application, or MAXM17903AMB+T equivalent, key selection considerations include its 10-pin uSLIC™ package (2.6mm × 3mm × 1.5mm), programmable EN/UVLO threshold (1.215V typ), open-drain RESET output with 2ms delay, internal soft-start (4.1ms typ), and PFM/PWM mode selection via MODE pin.
Technical Context
The MAXM17903AMB+T implements a peak-current-mode control architecture with fixed 500kHz switching frequency (465–535kHz range), internally compensated loop, and slope compensation to ensure stability across load and line variations. Its internal 5V LDO (VCC) powers gate drivers and logic, with dropout of 0.3V max at 5mA and UVLO thresholds at 4.18V (rising) and 3.8V (falling).
It integrates hiccup-mode overcurrent protection triggered when FB falls below 64.5% of regulation or inductor peak current exceeds limit, with 131ms hiccup timeout. Thermal shutdown activates at 166°C junction temperature with 10°C hysteresis, supporting operation from –40°C to +125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial and battery-derived supplies without external pre-regulation. |
| Output Current | Up to 300mA - sufficient for microcontrollers, sensors, and low-power peripherals in compact systems. |
| Output Voltage Range | Adjustable 0.9V to 5V - set via external resistor divider on FB pin; enables single BOM for multiple rail requirements. |
| Feedback Accuracy | ±1.5% - ensures tight regulation under varying load, temperature, and line conditions for precision analog/digital circuits. |
| Switching Frequency | 465–535kHz - balances EMI performance and inductor size; fixed-frequency PWM or light-load PFM selectable. |
| Soft-Start Time | 3.8–4.4ms - prevents inrush current and output overshoot during power-up, critical for sensitive downstream circuitry. |
| Shutdown Current | 2.2μA (typ) - enables ultra-low-power standby in battery-operated devices with long shelf life. |
| Operating Temperature | –40°C to +125°C ambient - qualified for harsh industrial and automotive under-hood environments. |
Pinout & Package
Package: 10-pin uSLIC™ (2.6mm × 3mm × 1.5mm), RoHS-compliant, land pattern 90-100027, thermal resistance θJA = 41.56°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LX | Switching node | Internal connection to inductor and MOSFET bridge; no external connection - must be routed with minimal loop area for EMI control. |
| 2 GND | Power ground | Main return path for high-current switching; requires low-impedance connection to PCB ground plane per layout guidelines. |
| 3 RESET | Open-drain power-good | Asserts low when FB < 92% of set value; high-impedance 2ms after FB > 95.5% - used for system sequencing and fault monitoring. |
| 4 MODE | PFM/PWM selection | Ground for forced-PWM (fixed frequency); floating for PFM (pulse-skipping at light loads) - latched at power-up only. |
| 5 OUT | Regulated output | Delivers final DC output; requires ceramic capacitor (≥10µF) directly to GND for stability and transient response. |
| 6 FB | Voltage feedback input | Monitors output via resistor divider (R3/R4); sets regulation point (0.9V reference) - determines output voltage for MAXM17903. |
| 7 VCC | Internal LDO output | 5V ±2.5% supply for internal circuitry; bypassed with ≥1µF ceramic capacitor to GND - not for external loading. |
| 8 EN/UVLO | Enable/UVLO input | Active-high enable; rising threshold 1.215V (typ); also configurable as input UVLO using external resistor divider. |
| 9–10 VIN | Input power supply | Dual pins for low-impedance 4.5–24V input; must be decoupled with ≥1µF ceramic capacitor placed close to pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated inductor & MOSFETs | Eliminates external magnetics and discrete FETs - reduces BOM count, layout complexity, and validation effort. |
| All-ceramic capacitor support | Enables use of small, reliable, low-ESR MLCCs for input/output filtering - improves reliability and saves board space. |
| Programmable EN/UVLO threshold | Allows precise input-voltage turn-on/off control via resistor divider - supports brown-out protection and multi-rail sequencing. |
| Hiccup-mode overcurrent protection | Shuts down switching for 131ms upon overload or short-circuit - protects device and system while enabling automatic recovery. |
| CISPR-22 Class B compliance | Meets conducted/radiated EMI limits without external filters - simplifies EMC certification for industrial end equipment. |
| Prebias startup capability | Soft-starts into existing output voltage without discharging capacitor - essential for multi-rail digital systems with staggered power-up. |
Applications
| Industrial Sensors and Encoders | 4–20mA Current-Loop Powered Sensors |
|---|---|
Use Scenario: Powering high-precision analog front-ends in factory automation encoders operating from 24V loop supply. IC Role / Device Role / Timing Role: Step-down regulator providing clean, stable 3.3V or 5V rail for ADCs, signal conditioners, and microcontrollers. Use Value: Delivers ±1.5% output accuracy and low ripple (<10mV p-p) to maintain sensor measurement integrity under variable load. | Use Scenario: Supplying isolated sensor electronics powered solely by 4–20mA loop current with limited headroom. IC Role / Device Role / Timing Role: Efficient buck converter extracting regulated voltage from low-current, high-impedance loop source. Use Value: Achieves >85% efficiency at 10mA load in PFM mode, extending operational range down to 4.5V input. |
| LDO Replacement | Battery-Powered Equipment |
Use Scenario: Replacing inefficient linear regulators in space-constrained IoT nodes where thermal dissipation is critical. IC Role / Device Role / Timing Role: High-efficiency switching alternative delivering same low-noise output with 3× lower thermal rise. Use Value: Reduces power loss from 300mW (LDO @ 200mA, 5V→3.3V) to <50mW - extends battery life and eliminates heatsinking. | Use Scenario: Powering portable medical monitors or handheld test instruments using single-cell Li-ion or dual-cell alkaline. IC Role / Device Role / Timing Role: Primary DC-DC stage converting 6–18V battery pack to stable 1.8V/3.3V system rails. Use Value: 2.2μA shutdown current and PFM mode enable >1-year shelf life; -40°C to +125°C rating supports outdoor deployment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down power module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAXM17901AMB+T | Fixed 3.3V output; identical package, pinout, and control features; no FB divider required. | Used where output voltage is invariant; eliminates two external resistors and associated layout area. | Select MAXM17901AMB+T when 3.3V is the sole required rail; MAXM17903AMB+T offers flexibility for multi-voltage designs. |
| TPSM84203RMLR | 3.3V fixed output; 4.5–17V input; 300mA; 2.5mm × 3.5mm QFN; no MODE pin; different pin assignment. | Lacks PFM/PWM selection and programmable EN/UVLO; requires external soft-start capacitor. | Choose TPSM84203RMLR if TI ecosystem alignment is prioritized and PFM optimization is unnecessary. |
Compared with MAXM17901AMB+T, the MAXM17903AMB+T adds output adjustability at the cost of two external resistors but retains identical thermal, EMI, and reliability performance. Against TPSM84203RMLR, it offers superior input voltage range, integrated soft-start, and flexible enable/UVLO programming - critical for robust industrial deployment.
Availability
The MAXM17903AMB+T is available at Aetrix Electronics and suitable for industrial sensors and encoders, 4–20mA current-loop powered sensors, and battery-powered equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAXM17903AMB+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, designs precision analog, mixed-signal, and power management ICs for industrial, medical, and communications applications.
The Himalaya power module product line targets space-constrained, thermally demanding systems requiring simplified, high-reliability DC-DC conversion - specifically engineered for rapid design-in and reduced qualification risk in industrial and instrumentation markets.
FAQ
What is the recommended input capacitor for MAXM17903AMB+T?
The MAXM17903AMB+T requires a minimum 1µF ceramic capacitor placed close to the VIN and GND pins. For optimal EMI performance and transient response, a 2.2µF X5R/X7R MLCC is recommended. This capacitor must be located within 2mm of the VIN/GND pads to minimize high-frequency loop inductance and prevent instability or excessive input ripple on the MAXM17903AMB+T.
Can MAXM17903AMB+T start up into a prebiased output?
Yes, the MAXM17903AMB+T supports startup into a prebiased output without discharging the output capacitor in both PFM and forced-PWM modes. This feature is implemented via internal control logic that monitors the FB node during soft-start and adjusts gate drive timing accordingly. It is essential for systems with multiple power rails where downstream circuitry may retain charge when the MAXM17903AMB+T is enabled.
How is the output voltage set on MAXM17903AMB+T?
The output voltage of MAXM17903AMB+T is set using an external resistor divider connected between OUT and GND, with the midpoint feeding the FB pin. The internal feedback reference is 0.90V (±1.5%). For example, to set 3.3V output, use R3 = 133kΩ and R4 = 75kΩ as specified in the typical application circuit. The MAXM17903AMB+T does not support direct output voltage programming via digital interface - adjustment is purely analog via resistor values.
What happens to RESET output during overcurrent or thermal fault?
During hiccup-mode overcurrent or thermal shutdown, the RESET output of MAXM17903AMB+T asserts low and remains low throughout the hiccup timeout period (131ms typ). It returns to high-impedance state only after the fault clears, soft-start completes, and FB rises above 95.5% of the regulated voltage - with a 2ms delay after that threshold is crossed. This behavior provides unambiguous fault signaling to host controllers.
Is MAXM17903AMB+T compatible with standard uSLIC™ land patterns?
Yes, the MAXM17903AMB+T uses the standardized uSLIC™ package with land pattern number 90-100027, matching other Himalaya modules like MAXM17901. The footprint supports reflow soldering at 260°C and complies with JESD22-B103/B104/B111 mechanical reliability standards. No custom stencil or assembly process is required - standard SMT placement and reflow profiles apply for the MAXM17903AMB+T.
MAXM17903AMB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-SMD Module
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output 1:
- 0.9 ~ 5V
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 300mA
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OTP, SCP, UVLO
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-eMGA (3x2.6)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
MAXM17903AMB+T FAQ
1.How can I place an order for MAXM17903AMB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXM17903AMB+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 MAXM17903AMB+T reliable?
The price and inventory of MAXM17903AMB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXM17903AMB+T is usually 5 days.
3.What payment methods are accepted for MAXM17903AMB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXM17903AMB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXM17903AMB+T?
MAXM17903AMB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXM17903AMB+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 MAXM17903AMB+T?
For technical support, including MAXM17903AMB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXM17903AMB+T requirements.
6.How does Aetrix verify that MAXM17903AMB+T is sourced from the original manufacturer or authorized distributors?
All MAXM17903AMB+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 MAXM17903AMB+T meets industry standards.
7.What is the process for return or replacement of MAXM17903AMB+T?
All MAXM17903AMB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAXM17903AMB+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 MAXM17903AMB+T part is unused and in its original packaging.
Return procedure for MAXM17903AMB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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