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Analog Devices Inc./Maxim Integrated MAX1605EUT+T
- Part No.:
- MAX1605EUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1605EUT+T.pdf
- Description:
- IC REG BOOST ADJ 560MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:2,980
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Product details
Overview
The MAX1605EUT+T from Maxim Integrated is a 6-pin SOT23-6 step-up DC-DC converter with an integrated 30V, 0.5A N-channel MOSFET, operating from a 2.4V–5.5V VCC supply while boosting input voltages as low as 0.8V up to 30V output. It delivers up to 20mA at 20V from a single Li+ battery, achieves 88% efficiency, and supports selectable inductor current limits (125/250/500mA) for optimized ripple and component size in LCD bias applications.
For engineers reviewing the MAX1605EUT+T datasheet, MAX1605EUT+T pinout, MAX1605EUT+T application, or MAX1605EUT+T equivalent, key selection criteria include its 0.8V minimum input capability, 1.25V feedback threshold, 18μA quiescent current, shutdown mode with 0.1μA draw, and compatibility with compact 10μH inductors and Schottky rectifiers in space-constrained portable displays.
Technical Context
The MAX1605EUT+T employs a minimum off-time, current-limited control scheme using paired one-shots to enforce tOFF(MIN) = 0.75–1.25μs and tON(MAX) = 9–17μs, enabling up to 500kHz switching frequency dependent on load and input voltage. Its internal 30V N-channel MOSFET features 0.8–2Ω on-resistance and programmable peak current limit via the LIM pin.
Feedback regulation uses a precision 1.215–1.285V reference with ≤100nA input bias current, allowing high-impedance resistor dividers (R2 = 10kΩ–200kΩ) for stable output setting from VIN to 30V. The SHDN pin accepts logic-level inputs up to 6V independent of VCC or VOUT, and LX remains high-impedance during shutdown while output decays through the inductor-diode path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (VCC) | 2.4V to 5.5V - powers IC logic; separate from inductor input (VIN = 0.8V to VOUT) |
| Output Voltage Range | Up to 30V - set via external resistor divider on FB pin with 1.25V reference |
| Switch Current Limit | Selectable: 125mA (LIM=GND), 250mA (LIM=FLOAT), 500mA (LIM=VCC) - directly scales inductor size and ripple |
| Quiescent Supply Current | 18μA typical - enables ultra-low-power operation in always-on display bias circuits |
| Shutdown Current | 0.1μA - preserves battery life during device sleep without external disconnect |
| Switching Frequency | Up to 500kHz - permits use of small 10μH surface-mount inductors and fast Schottky diodes |
| Feedback Reference Voltage | 1.25V ±1.2% - defines output accuracy; low 100nA bias current allows high-value resistors |
Pinout & Package
MAX1605EUT+T is housed in a 6-pin SOT23-6 package (JEDEC MO-178AA, 2.9mm × 1.6mm × 1.1mm), optimized for high-density portable PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Pull to GND to reduce ICC to 0.1μA; tolerates up to 6V regardless of VCC/VOUT |
| 2 - VCC | IC supply voltage input | Must be bypassed with ≥0.1μF ceramic capacitor; powers internal logic and gate driver |
| 3 - GND | Power and signal ground reference | Low-impedance connection required; tie directly to ground plane within 5mm of CIN/COUT grounds |
| 4 - LX | Switch node / MOSFET drain | Connects to inductor; high-impedance during shutdown; max 30.5V swing |
| 5 - LIM | Inductor current limit select | VCC = 500mA, floating = 250mA, GND = 125mA - sets peak switch current without external components |
| 6 - FB | Feedback input | 1.25V reference point; connect resistor divider from VOUT to set output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 30V, 0.5A N-MOSFET | Eliminates external high-voltage switch; reduces BOM count and layout area in LCD bias supplies |
| Selectably limited peak inductor current | Three discrete current settings (125/250/500mA) enable trade-off between efficiency, ripple, and inductor size |
| Ultra-low quiescent current (18μA) | Extends battery runtime in handheld devices where display bias remains active during standby |
| Independent VIN and VCC supplies | Allows 0.8V battery to feed inductor while 2.4–5.5V logic rail powers IC - critical for single-cell Li+ systems |
| High-accuracy feedback reference (1.25V ±1.2%) | Enables stable, precise output voltage setting across temperature with minimal resistor tolerance impact |
Applications
| Small LCD Bias Generators | Cellular Phone Display Supplies |
|---|---|
Use Scenario: Generating +18V and –19V bias rails for monochrome STN or CSTN LCD panels in feature phones. IC Role / Device Role / Timing Role: Primary step-up converter for positive VPOS; configured with external charge-pump diodes/caps for negative VNEG. Use Value: Delivers regulated 20mA at 20V from 3.6V Li+ cell with 88% efficiency; selectable 125mA limit minimizes inductor size in thin handsets. | Use Scenario: Powering segmented LCDs in dual-SIM GSM handsets requiring low-noise, low-quiescent bias generation. IC Role / Device Role / Timing Role: Standby-mode LCD voltage source activated only when display is enabled; shutdown current <0.1μA prevents battery drain. Use Value: 18μA operating current and 0.1μA shutdown current extend shelf life and standby time; SOT23-6 footprint fits tight RF module margins. |
| Palmtop Computer LCD Drivers | PDAs with Dual-Polarity Displays |
Use Scenario: Providing adjustable +15V to +25V bias for high-contrast reflective LCDs in Windows CE-based palmtops. IC Role / Device Role / Timing Role: Programmable boost regulator with external R1/R2 feedback network; LIM pin selects current limit based on display segment count. Use Value: 30V output capability and 1.25V reference allow precise tuning across multiple panel variants using same PCB layout. | Use Scenario: Simultaneous generation of +18V and –18V rails for active-matrix LCDs in early PDAs with grayscale capability. IC Role / Device Role / Timing Role: Positive rail generator with external charge-pump stage; FB loop regulates positive output while negative rail tracks via capacitive coupling. Use Value: Internal 500kHz switching enables compact 10μH inductor and 0.1μF ceramic caps; eliminates need for second IC or transformer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1771ESA+ | Wider VCC range (3V–16.5V); no integrated switch; requires external MOSFET and diode | Used in higher-power industrial bias supplies; lacks 0.8V VIN capability and ultra-low IQ | Choose MAX1771ESA+ only if >500mA output or >16.5V VCC needed; not drop-in for MAX1605EUT+T |
| TPS61040DBVR | Lower max output (28V); fixed 0.5A switch; 2.7V–5.5V VCC; 20μA IQ; no LIM pin | Common in modern portable LCDs but lacks 0.8V start-up and selectable current limit | TPS61040DBVR suits newer designs with ≥2.7V supply; MAX1605EUT+T preferred for sub-2.4V battery backup or ripple-sensitive layouts |
Compared with MAX1771ESA+, the MAX1605EUT+T integrates the power switch and starts from 0.8V, reducing external parts and enabling single-cell alkaline/Li+ operation; versus TPS61040DBVR, it offers lower start-up voltage, programmable current limit, and tighter feedback reference - critical for legacy low-voltage display modules.
Availability
MAX1605EUT+T is available at Aetrix Electronics and suitable for LCD bias generators, cellular phone display supplies, and palmtop computer power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1605EUT+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, communications, and consumer applications.
The MAX1605EUT+T belongs to Maxim's LCD bias supply product line, engineered specifically for ultra-low-input-voltage, high-efficiency boost conversion in space-constrained portable displays with stringent quiescent current requirements.
FAQ
What is the minimum input voltage the MAX1605EUT+T can boost from?
The MAX1605EUT+T can boost from an inductor input voltage (VIN) as low as 0.8V while maintaining regulation, provided the VCC supply remains within 2.4V–5.5V. This enables operation directly from partially discharged single-cell batteries, making the MAX1605EUT+T especially valuable in legacy portable devices where deep discharge tolerance is required. The 0.8V VIN capability is verified across temperature and load conditions per the datasheet's Electrical Characteristics table.
How does the LIM pin configure the current limit on the MAX1605EUT+T?
The LIM pin on the MAX1605EUT+T selects peak inductor current limit in three discrete states: connecting LIM to GND sets 125mA, leaving LIM floating sets 250mA, and connecting LIM to VCC sets 500mA. These thresholds are guaranteed over temperature and input voltage, and directly determine inductor saturation margin, output ripple amplitude, and minimum practical inductance value. The MAX1605EUT+T datasheet provides detailed current-limit vs. supply voltage curves confirming these settings.
Can the MAX1605EUT+T generate negative output voltages?
Yes, the MAX1605EUT+T can generate negative outputs by adding an external diode-capacitor charge-pump stage to the LX pin, as shown in Figure 4 of the datasheet. In this configuration, the FB pin still regulates the positive output (which remains unloaded), while the negative rail is derived capacitively. The MAX1605EUT+T maintains full control loop stability and efficiency in this mode, delivering up to –19V with appropriate component selection - a capability confirmed in the Applications Information section.
What is the shutdown behavior of the MAX1605EUT+T regarding output isolation?
During shutdown (SHDN = GND), the MAX1605EUT+T disables switching and places LX in high-impedance state, but the output remains connected to the input through the inductor and output rectifier diode. As a result, VOUT decays to approximately VIN minus one diode drop rather than fully disconnecting. For true output isolation, the datasheet recommends adding an external PNP transistor stage - a design detail explicitly documented in Figure 5 and the Output Disconnected in Shutdown section.
Which package variant does the MAX1605EUT+T use, and what are its mechanical dimensions?
The MAX1605EUT+T uses the 6-pin SOT23-6 package (package code U6F+6), measuring 2.9mm × 1.6mm × 1.1mm with standard JEDEC MO-178AA outline. Its land pattern (90-0175) and thermal characteristics - including 696mW continuous power dissipation at +70°C with 8.7mW/°C derating - are fully specified in the Package Information section of the MAX1605EUT+T datasheet, ensuring reliable thermal performance in high-density layouts.
MAX1605EUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.4V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 560mA
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1605EUT+T FAQ
1.How can I place an order for MAX1605EUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1605EUT+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 MAX1605EUT+T reliable?
The price and inventory of MAX1605EUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1605EUT+T is usually 5 days.
3.What payment methods are accepted for MAX1605EUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1605EUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1605EUT+T?
MAX1605EUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1605EUT+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 MAX1605EUT+T?
For technical support, including MAX1605EUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1605EUT+T requirements.
6.How does Aetrix verify that MAX1605EUT+T is sourced from the original manufacturer or authorized distributors?
All MAX1605EUT+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 MAX1605EUT+T meets industry standards.
7.What is the process for return or replacement of MAX1605EUT+T?
All MAX1605EUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1605EUT+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 MAX1605EUT+T part is unused and in its original packaging.
Return procedure for MAX1605EUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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