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Analog Devices Inc./Maxim Integrated MAX1730EUB+
- Part No.:
- MAX1730EUB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1730EUB+.pdf
- Description:
- IC REG CHG PUMP PROG 50MA 10UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
MAX1730EUB+ from Maxim Integrated is a regulated step-down charge pump IC delivering up to 50mA at fixed 1.8V or 1.9V output from a 2.7V–5.5V input, operating at up to 2MHz with 75µA quiescent current and ±3% output voltage accuracy-designed for compact low-voltage logic supplies in space-constrained portable electronics.
For engineers reviewing the MAX1730EUB+ datasheet, MAX1730EUB+ pinout, MAX1730EUB+ application, or MAX1730EUB+ equivalent, key selection criteria include guaranteed 50mA output, dual-mode 1.8V/1.9V pin-selectable regulation, no-inductor architecture, shutdown disconnect functionality, and µMAX package compatibility with high-impedance battery sources like alkaline and Li-ion cells.
Technical Context
The MAX1730EUB+ employs pulse-skipping PFM control and automatically transitions between 1:1, 3:2, and 2:1 flying-capacitor configurations based on input-output voltage ratio to maximize efficiency. Its internal oscillator operates at 1.5–2.5MHz, enabling use of 0.22µF ceramic flying capacitors.
It integrates proprietary soft-start circuitry to limit inrush current during startup and features active-low SHDN with <5µA shutdown supply current. Output disconnect in shutdown mode isolates OUT from IN, placing the output in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Pin-selectable 1.8V (FB = GND) or 1.9V (FB = IN), ±3% accuracy ensures stable logic rail tolerance |
| Max Output Current | 50mA guaranteed-sufficient for multiple low-power logic ICs or microcontroller I/O banks |
| Input Voltage Range | 2.7V to 5.5V-supports single-cell Li-ion, alkaline, or regulated 3.3V/5V system rails |
| Quiescent Supply Current | 75µA typical-enables long battery life in always-on or low-duty-cycle portable systems |
| Operating Frequency | Up to 2.5MHz-permits ultra-small 0.22µF flying capacitors and minimizes PCB footprint |
| Shutdown Current | <5µA-reduces standby power loss in battery-powered devices with periodic wake-up cycles |
| No-Inductor Design | Uses only ceramic capacitors-eliminates EMI, size, and cost penalties of magnetic components |
Pinout & Package
The MAX1730EUB+ is housed in a 10-pin µMAX package (3mm × 3mm, 1.09mm max height), thermally optimized without exposed pad and compatible with standard surface-mount assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| FB (Pin 1) | Feedback select | Connect to GND for 1.8V output; connect to IN for 1.9V output-no floating allowed |
| SHDN (Pin 2) | Active-low enable | Pull low to disable regulator; OUT disconnects from IN and enters high-impedance state |
| C1P (Pin 3) | Flying cap positive | Switching node for C1 capacitor in all three charge-pump configurations (1:1, 3:2, 2:1) |
| C1N (Pin 4) | Flying cap negative | Return node for C1; tied to GND or OUT depending on phase and configuration |
| GND (Pin 5) | Analog ground | Reference for FB, SHDN, and internal control circuitry-separate from PGND for noise isolation |
| PGND (Pin 6) | Power ground | High-current return path for switching nodes (C1P/C1N/C2P/C2N)-must tie to low-impedance plane |
| C2N (Pin 7) | Flying cap negative | Return node for C2; switches between GND and OUT per phase and configuration |
| C2P (Pin 8) | Flying cap positive | Primary switching node for C2-critical for charge transfer timing and efficiency |
| OUT (Pin 9) | Regulated output | Delivers 1.8V/1.9V up to 50mA; bypass with ≥4.7µF ceramic capacitor for ripple suppression |
| IN (Pin 10) | Input supply | Accepts 2.7V–5.5V; requires local 1µF ceramic decoupling placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| Peak efficiency >85% | Maintains high conversion efficiency across 2.7V–5.5V input range and 0–50mA load-exceeds linear regulators in battery-powered operation |
| Dual-mode output selection | Hardware-configurable 1.8V/1.9V via FB pin-no external resistors or programming required |
| Proprietary soft-start | Prevents inrush current spikes during startup-enables reliable operation from high-impedance alkaline/Li-ion cells |
| Output disconnect in shutdown | Isolates load from input source-prevents backfeed and preserves battery charge during deep sleep |
| 2MHz-capable switching | Supports 0.22µF flying capacitors-reduces total BOM count and board area vs. lower-frequency charge pumps |
Applications
| Low-Voltage Logic Supplies | Wireless Handsets |
|---|---|
Use Scenario: Powering 1.8V I/O banks and core logic in ASICs or FPGAs within battery-operated handheld devices. IC Role / Device Role / Timing Role: Regulated step-down charge pump providing stable, low-noise 1.8V/1.9V rail independent of battery voltage sag. Use Value: Eliminates need for inductor-based DC/DC converters-reducing EMI, height, and cost while maintaining >85% efficiency at light loads. |
Use Scenario: Supplying auxiliary logic rails (e.g., RF transceiver interface, keypad controller, display driver) in GSM/CDMA handsets. IC Role / Device Role / Timing Role: Compact, low-quiescent-current voltage source enabling fast wake-up from sleep modes without compromising battery runtime. Use Value: 75µA no-load current and <5µA shutdown current extend talk/standby time; µMAX package fits tight RF module layouts. |
| PDAs | Hand-Held Instruments |
Use Scenario: Generating clean 1.8V supply for flash memory interfaces and touch-screen controllers in palm-sized PDAs. IC Role / Device Role / Timing Role: Pin-selectable dual-output charge pump supporting mixed-voltage subsystems from single battery cell. Use Value: ±3% output accuracy ensures reliable NAND/NOR flash read/write timing; no-inductor design avoids interference with sensitive analog sensors. |
Use Scenario: Powering low-power microcontrollers and precision ADC front-ends in portable multimeters or gas detectors. IC Role / Device Role / Timing Role: High-efficiency, low-ripple logic supply that remains stable under varying battery discharge profiles (2.7V–4.2V). Use Value: Automatic charge-pump mode switching maintains >80% efficiency across full input range-minimizing thermal drift in measurement circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar regulated step-down charge pump applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1727EUB+ | Same 10-pin µMAX package and 1.8V/1.9V dual-mode output, but rated for 25mA max output current and 1.2MHz max frequency | Suitable for ultra-low-power logic rails where 25mA suffices; not recommended for 50mA loads or >1.2MHz layout constraints | Select MAX1727EUB+ only when load current ≤25mA and board space allows larger flying capacitors due to lower frequency |
| TPS60230RGTR | TI part offers 1.8V fixed output only (no 1.9V option), 60mA output, 1MHz switching, and requires different flying capacitor values (0.47µF) | Better for higher-current 1.8V-only applications; lacks pin-selectable voltage and 2MHz capability | Choose TPS60230RGTR if 60mA is needed and 1.9V output is unnecessary-verify layout compatibility with 0.47µF caps and 1MHz EMI profile |
Compared with MAX1727EUB+ and TPS60230RGTR, the MAX1730EUB+ uniquely combines 50mA capability, dual 1.8V/1.9V selection, 2MHz operation, and <5µA shutdown current in a 3mm × 3mm µMAX package-making it optimal for space- and efficiency-critical dual-voltage logic supplies.
Availability
MAX1730EUB+ is available at Aetrix Electronics and suitable for wireless handsets, PDAs, and hand-held instruments requiring stable component supply with guaranteed -40°C to +85°C operation, RoHS-compliant packaging, and long-term production support.
Supply support for MAX1730EUB+ 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 portable applications.
The MAX1730EUB+ belongs to Maxim's regulated charge pump product line, engineered specifically to replace linear regulators in battery-powered logic supplies where size, efficiency, and input voltage flexibility are critical.
FAQ
What output voltage options does the MAX1730EUB+ support, and how are they selected?
The MAX1730EUB+ supports two fixed output voltages: 1.8V and 1.9V. Selection is hardware-based via the FB pin-connect FB to GND for 1.8V output, or to IN for 1.9V output. Leaving FB unconnected is prohibited. Both options maintain ±3% output voltage accuracy across temperature and load, and the MAX1730EUB+ automatically configures its internal charge-pump topology to optimize efficiency for the selected voltage.
Does the MAX1730EUB+ require an inductor, and what external components are mandatory?
No, the MAX1730EUB+ is a capacitor-based charge pump and requires no inductor. Mandatory external components include: a 1µF ceramic input capacitor (CIN) placed near IN, two 0.22µF ceramic flying capacitors (C1 and C2) connected to C1P/C1N/C2P/C2N, and a ≥4.7µF ceramic output capacitor (COUT) at OUT. These values ensure stable regulation, low ripple, and full 50mA output capability per the MAX1730EUB+ datasheet specifications.
How does the MAX1730EUB+ behave during shutdown, and what is its shutdown current?
When the SHDN pin is pulled low, the MAX1730EUB+ enters shutdown mode with supply current reduced to <5µA. Critically, the output disconnects from the input-OUT goes to high impedance, preventing backfeed into the source. This behavior protects battery sources and enables true load isolation. The MAX1730EUB+ also incorporates soft-start circuitry that limits inrush current during wake-up, ensuring compatibility with high-impedance alkaline and Li-ion cells.
What is the operating temperature range and package type of the MAX1730EUB+?
The MAX1730EUB+ is specified for operation from -40°C to +85°C and is packaged in a 10-pin µMAX package measuring 3mm × 3mm with a maximum height of 1.09mm. This RoHS-compliant, surface-mount package has no exposed thermal pad and is designed for reflow soldering. Its compact footprint and low profile make the MAX1730EUB+ ideal for ultra-thin portable electronics where board space and component height are constrained.
Can the MAX1730EUB+ operate efficiently across the full 2.7V–5.5V input range while delivering 50mA?
Yes-the MAX1730EUB+ guarantees 50mA output current across its entire 2.7V–5.5V input range and maintains >80% efficiency at 50mA load from 2.7V to 5.5V, as verified in typical operating characteristics graphs. It achieves this by automatically switching between 1:1, 3:2, and 2:1 flying-capacitor configurations based on the VIN/VOUT ratio. Efficiency peaks above 85% near mid-input voltages (e.g., 3.3V–4.2V), and the MAX1730EUB+ sustains regulation without dropout or thermal shutdown under these conditions.
MAX1730EUB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Charge Pump
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V, 1.9V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA
- Frequency - Switching:
- 2kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-uMAX/uSOP
MAX1730EUB+ FAQ
1.How can I place an order for MAX1730EUB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1730EUB+ 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 MAX1730EUB+ reliable?
The price and inventory of MAX1730EUB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1730EUB+ is usually 5 days.
3.What payment methods are accepted for MAX1730EUB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1730EUB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1730EUB+?
MAX1730EUB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1730EUB+ 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 MAX1730EUB+?
For technical support, including MAX1730EUB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1730EUB+ requirements.
6.How does Aetrix verify that MAX1730EUB+ is sourced from the original manufacturer or authorized distributors?
All MAX1730EUB+ 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 MAX1730EUB+ meets industry standards.
7.What is the process for return or replacement of MAX1730EUB+?
All MAX1730EUB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1730EUB+, 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 MAX1730EUB+ part is unused and in its original packaging.
Return procedure for MAX1730EUB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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