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Analog Devices Inc./Maxim Integrated MAX1605EUT#G16
- Part No.:
- MAX1605EUT#G16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1605EUT#G16.pdf
- Description:
- IC REG BOOST ADJ 0.35A SOT23-6
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Inventory:3,536
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Product details
Overview
MAX1605EUT#G16 from Maxim Integrated is a 30V internal-switch boost DC-DC converter in a 6-pin SOT23 package, designed for LCD bias generation. It operates from a 2.4V–5.5V IC supply while boosting input voltages as low as 0.8V up to 30V output, delivers up to 20mA at 20V from a single Li+ cell, achieves 88% efficiency, and features selectable 125/250/500mA inductor current limit.
For engineers reviewing the MAX1605EUT#G16 datasheet, MAX1605EUT#G16 pinout, MAX1605EUT#G16 application, or MAX1605EUT#G16 equivalent, key selection criteria include its ultra-low 18µA quiescent current, shutdown mode with 0.1µA supply draw, 500kHz max switching frequency enabling compact magnetics, and dedicated LIM pin for load-optimized current limiting without external components.
Technical Context
The MAX1605EUT#G16 implements a minimum off-time, current-limited control scheme with programmable peak inductor current (125mA/250mA/500mA) set via the LIM pin. Its internal 30V N-channel MOSFET has 1Ω typical on-resistance and supports operation with separate VIN (0.8V–30V) and VCC (2.4V–5.5V) supplies - enabling direct battery connection to LX while isolating logic bias.
Feedback regulation uses a precision 1.25V reference (±2.5% over temperature) at the FB pin, with <100nA input bias current allowing high-value resistor dividers. Startup extends minimum off-time to limit inrush, and shutdown forces LX into high-impedance state while reducing ICC to 0.1µA - critical for portable LCD panel power management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Up to 30V - supports standard LCD positive bias rails (e.g., +18V, +20V) and negative bias via charge-pump extension. |
| Input Supply Range (VCC) | 2.4V to 5.5V - compatible with Li+ batteries, 3.3V/5V logic rails, and regulated system supplies. |
| Inductor Input Range (VIN) | 0.8V to VOUT - enables direct connection to depleted alkaline or Li+ cells without pre-regulation. |
| Peak Switch Current Limit | Selectable 125mA / 250mA / 500mA - determines inductor size, ripple, and max output power without external sense resistors. |
| Quiescent Supply Current | 18µA typical - minimizes standby drain in always-on LCD modules and handheld devices. |
| Shutdown Current | 0.1µA - preserves battery life during display-off periods in PDAs and palmtops. |
| Switching Frequency | Up to 500kHz - allows use of small 10µH surface-mount inductors and reduces EMI filtering requirements. |
Pinout & Package
MAX1605EUT#G16 is housed in a 6-pin SOT23 package (JEDEC MO-178AA, 2.9mm × 2.8mm × 1.3mm), optimized for space-constrained portable displays. Pin 1 is SHDN (top-left corner when notch faces up); pin 3 is GND (center-bottom); pin 6 is FB (bottom-right).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling low disables switching, reduces ICC to 0.1µA, and places LX in high-Z - essential for display sleep modes. |
| 2 VCC | IC bias supply input | Must be bypassed with ≥0.1µF ceramic capacitor; powers internal logic and gate driver independently of VIN. |
| 3 GND | Power and signal reference | Single ground plane required; must be tied directly to input/output capacitor grounds within 5mm for stability. |
| 4 LX | Internal MOSFET drain node | Connects to inductor and Schottky rectifier; handles up to 30.5V and 500mA peak current; high-Z in shutdown. |
| 5 LIM | Current limit selection | GND = 125mA, floating = 250mA, VCC = 500mA - sets peak inductor current without external components. |
| 6 FB | Feedback voltage sense | 1.25V reference threshold; connects to resistor divider from VOUT; <100nA bias enables high-impedance scaling. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 30V output | Configurable via FB resistor divider - supports diverse LCD panel bias requirements without redesign. |
| Triple-selectable current limit | Hardware-configured 125/250/500mA limits allow one BOM to cover low-power (e.g., 5mA) and medium-power (e.g., 20mA) panels. |
| Ultra-low 18µA quiescent current | Extends battery runtime in always-on display applications where background bias remains active during UI sleep. |
| Separate VIN/VCC inputs | Enables direct 0.8V battery connection to LX while powering logic from stable 3.3V rail - eliminates pre-regulator stage. |
| 500kHz max switching frequency | Permits use of 10µH inductors under 2mm height - critical for thin mobile form factors like clamshell phones and PDAs. |
Applications
| Small LCD Bias Generation | Cellular Phone Display Power |
|---|---|
|
Use Scenario: Powering monochrome or color STN/TFT LCD panels in handheld devices requiring +15V to +20V positive bias and −10V to −15V negative bias. IC Role / Device Role / Timing Role: Primary DC-DC boost converter generating regulated high-voltage rails from single-cell Li+ or alkaline sources. Use Value: Eliminates need for external current-sense resistors and discrete MOSFETs, reducing BOM count by ≥4 components versus controller-based solutions. |
Use Scenario: Supplying VPOS and VNEG for backlit LCDs in GSM/CDMA handsets operating across battery discharge range (4.2V → 3.0V). IC Role / Device Role / Timing Role: High-efficiency bias generator maintaining stable output despite varying input voltage and load transients during call setup. Use Value: 88% efficiency at 10mA load ensures minimal thermal rise in sealed handset enclosures; 0.1µA shutdown current prevents overnight battery drain. |
| Palmtop Computer LCD Supply | PDA Organizers with Dual-Voltage Displays |
|
Use Scenario: Delivering ±18V bias for high-contrast grayscale LCDs in Windows CE or Palm OS palmtops with tight PCB area budgets. IC Role / Device Role / Timing Role: Compact, integrated boost converter replacing multi-chip discrete solutions in 30mm × 30mm display subassemblies. Use Value: 6-pin SOT23 footprint (2.9mm × 2.8mm) saves >60% board area versus TDFN alternatives; supports 500kHz operation for smallest possible LC filter. |
Use Scenario: Generating independent +15V and −12V rails for segmented LCDs in electronic organizers with dual-battery configurations. IC Role / Device Role / Timing Role: Dual-rail power source using single MAX1605EUT#G16 with external charge-pump diodes (D1/D2/C3) per Figure 4. Use Value: Single-IC solution reduces component count vs. dual-boost topology; LIM pin allows current optimization for each rail's load profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1771ESA+ | Wider VCC range (3V–20V), no integrated switch (external MOSFET required), fixed 1.25V FB reference. | Suitable for higher-input industrial bias supplies (>5.5V), but requires additional FET, driver, and sense resistor. | Choose MAX1771ESA+ only if input exceeds 5.5V or higher output current (>500mA) is needed - not a drop-in replacement. |
| TPS61040DBVR | Lower max output (28V), 28V internal switch, 0.5A switch, 1.23V FB reference, 2.7V–5.5V VCC range. | Compatible with Li+ input but lacks 0.8V VIN capability; less suitable for alkaline-powered devices. | TPS61040DBVR fits designs already using TI ecosystem and needing <28V output; verify 0.8V startup compatibility before substitution. |
Compared with MAX1605EUT#G16, MAX1771ESA+ trades integration for input flexibility, while TPS61040DBVR offers similar integration but narrower low-voltage startup - making MAX1605EUT#G16 uniquely suited for ultra-low-VIN portable LCD bias where space and battery life are critical.
Availability
MAX1605EUT#G16 is available at Aetrix Electronics and suitable for LCD bias generators, cellular phone displays, palmtop computers, and PDA organizers requiring stable component supply across extended production lifecycles.
Supply support for MAX1605EUT#G16 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 portable, industrial, and communications systems.
The MAX1605EUT#G16 belongs to Maxim's LCD bias supply product line, engineered specifically for space- and power-constrained portable displays requiring high-voltage, low-quiescent-current DC-DC conversion from single-cell sources.
FAQ
What is the minimum input voltage the MAX1605EUT#G16 can boost from?
The MAX1605EUT#G16 supports inductor input voltages as low as 0.8V while maintaining regulation - enabling operation directly from nearly depleted alkaline or single Li+ cells. This capability is distinct from its 2.4V–5.5V VCC supply requirement, which powers internal circuitry separately. The 0.8V VIN minimum is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet.
How does the LIM pin configure current limiting on the MAX1605EUT#G16?
The LIM pin on the MAX1605EUT#G16 selects peak inductor current in three discrete steps: connect to GND for 125mA, leave floating for 250mA, or tie to VCC for 500mA. This hardware-selectable limit adjusts switching behavior and output capability without external components. The configuration is validated in the Pin Description section and Figure 2 of the datasheet, with corresponding ILX(MAX) values specified across temperature.
Can the MAX1605EUT#G16 generate negative output voltages?
Yes, the MAX1605EUT#G16 can generate negative bias voltages (e.g., −19V) using an external diode-capacitor charge-pump network connected to the LX pin, as shown in Figure 4 of the datasheet. Feedback remains connected to the positive output, and the negative rail is derived passively - a common technique for LCD VEE generation. Output regulation is looser than the positive rail, but acceptable for most segment LCD applications.
What is the feedback reference voltage of the MAX1605EUT#G16 and how precise is it?
The MAX1605EUT#G16 uses a 1.25V internal feedback reference voltage (VFB) with ±2.5% tolerance over −40°C to +85°C, specified as 1.215V to 1.285V in the Electrical Characteristics table. This precision enables accurate output voltage setting via external resistor dividers, and the low 100nA FB input bias current allows use of high-value resistors without significant error.
Does the MAX1605EUT#G16 require external components for basic operation?
Yes, the MAX1605EUT#G16 requires four external components for basic boost operation: an inductor (e.g., 10µH), Schottky diode (e.g., MBRS0530), output capacitor (≥1µF ceramic), and FB resistor divider. Input bypass capacitors (0.1µF on VCC, 10µF on VIN) are also mandatory per layout guidelines. These requirements are detailed in Figure 3 and the Design Procedure section of the datasheet.
MAX1605EUT#G16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1605EUT#G16 FAQ
1.How can I place an order for MAX1605EUT#G16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1605EUT#G16 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#G16 reliable?
The price and inventory of MAX1605EUT#G16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1605EUT#G16 is usually 5 days.
3.What payment methods are accepted for MAX1605EUT#G16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1605EUT#G16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1605EUT#G16?
MAX1605EUT#G16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1605EUT#G16 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#G16?
For technical support, including MAX1605EUT#G16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1605EUT#G16 requirements.
6.How does Aetrix verify that MAX1605EUT#G16 is sourced from the original manufacturer or authorized distributors?
All MAX1605EUT#G16 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#G16 meets industry standards.
7.What is the process for return or replacement of MAX1605EUT#G16?
All MAX1605EUT#G16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1605EUT#G16, 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#G16 part is unused and in its original packaging.
Return procedure for MAX1605EUT#G16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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