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Analog Devices Inc./Maxim Integrated MAX1605EUT#TG16
- Part No.:
- MAX1605EUT#TG16
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- SOT-23-6
- Datasheet:
-
MAX1605EUT#TG16.pdf
- Description:
- IC REG BOOST ADJ 350MA SOT6
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
MAX1605EUT#TG16 from Maxim Integrated is a 30V internal-switch boost converter IC designed for LCD bias generation in space-constrained portable devices. It features a 0.5A integrated N-channel MOSFET, operates from a 2.4V–5.5V VCC supply while boosting input voltages as low as 0.8V, delivers up to 30V output, and achieves 88% efficiency at 10mA load with 10µH inductor.
For engineers reviewing the MAX1605EUT#TG16 datasheet, MAX1605EUT#TG16 pinout, MAX1605EUT#TG16 application, or MAX1605EUT#TG16 equivalent, key selection criteria include its selectable 125/250/500mA inductor current limit, 18µA quiescent current, 6-pin SOT23-6 package, and ability to generate stable high-voltage bias from single-cell Li+ or low-voltage batteries.
Technical Context
The MAX1605EUT#TG16 implements a minimum off-time, current-limited control architecture with programmable peak inductor current (125/250/500mA via LIM pin), fixed 1.25V feedback reference, and internal 1Ω MOSFET switch rated to 30V. Its startup logic extends minimum off-time to limit surge current.
It supports dual-supply operation: VCC (2.4V–5.5V) powers the control circuitry, while VIN (0.8V–VOUT) supplies the inductor-enabling direct battery connection without regulation. Shutdown reduces supply current to 0.1µA and places LX in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.4V to 5.5V - powers internal logic; requires local 0.1µF bypass capacitor. |
| VIN Range | 0.8V to VOUT - enables direct low-voltage battery input to inductor, independent of VCC. |
| Max Output Voltage | 30V - sets upper limit for LCD positive/negative bias generation using external resistor divider. |
| Switch Current Limit | Selectable: 125mA (LIM=GND), 250mA (LIM=FLOAT), 500mA (LIM=VCC) - determines inductor size and ripple trade-offs. |
| Quiescent Current | 18µA - minimizes standby power loss in battery-powered LCD modules. |
| Shutdown Current | 0.1µA - enables ultra-low-power sleep mode for extended device battery life. |
| Feedback Reference | 1.25V ±25mV - defines output voltage setpoint via R1/R2 divider; supports <1% error with proper resistor selection. |
Pinout & Package
MAX1605EUT#TG16 is housed in a 6-pin SOT23-6 package (3.0mm × 1.7mm × 1.3mm), RoHS-compliant, with exposed pad not electrically connected. Pin 1 is SHDN (top-left corner when notch faces up).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SHDN | Active-low shutdown control | Pull low to disable switching; reduces ICC to 0.1µA and places LX in high-Z; tolerates up to 6V regardless of VCC/VIN. |
| 2 - VCC | IC supply voltage input | Must be 2.4V–5.5V; powers internal logic and gate driver; requires 0.1µF ceramic bypass to GND. |
| 3 - GND | Power and signal ground reference | Shared return path for VCC, LX, FB, LIM, SHDN; must be low-inductance connection to minimize noise. |
| 4 - LX | Switch node / MOSFET drain | Connects to inductor and Schottky diode anode; swings from GND to up to 30.5V; high-Z during shutdown. |
| 5 - LIM | Inductor current limit select | Logic level sets peak current: GND=125mA, float=250mA, VCC=500mA; bias current <1µA. |
| 6 - FB | Feedback input | Monitors output via resistive divider; compares to 1.25V reference; input bias ≤100nA enables high-value resistors. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 30V, 0.5A N-MOSFET | Eliminates external switch; reduces BOM count and layout area; 1Ω on-resistance optimized for efficiency at light loads. |
| Selectably limited peak inductor current | Three discrete current limits (125/250/500mA) enable scalable design: smaller inductors for compact PDAs, higher current for larger panels. |
| Ultra-low quiescent current (18µA) | Extends battery runtime in always-on LCD bias applications such as organizers and palmtops without compromising startup speed. |
| Independent VIN and VCC inputs | Allows direct 0.8V battery connection to inductor while maintaining regulated 2.4V–5.5V logic supply - critical for single-cell Li+ systems. |
| High-frequency operation (up to 500kHz) | Enables use of tiny 10µH surface-mount inductors and low-ESR ceramic capacitors, minimizing solution footprint. |
Applications
| Small LCD Bias Generation | Cellular Phone Display Power |
|---|---|
Use Scenario: Generating +18V and –18V bias rails for monochrome STN LCDs in handheld organizers with single Li+ cell. IC Role / Device Role / Timing Role: Primary DC-DC boost controller providing regulated high-voltage outputs via external charge-pump diodes and capacitors. Use Value: Enables full display functionality from 3.6V battery with only 18µA quiescent draw; selectable 125mA current limit allows minimal 2.2mm × 1.4mm inductor. | Use Scenario: Supplying VPOS and VNEG for backlit color LCDs in GSM handsets operating across 3.0V–4.2V battery range. IC Role / Device Role / Timing Role: High-efficiency, low-noise bias generator supporting rapid display wake-up and dynamic contrast adjustment. Use Value: Delivers 20mA at 20V from 3.6V input with 88% efficiency; 500kHz switching avoids audible noise in speaker-near layouts. |
| Palmtop Computer Display Supply | Industrial Handheld Terminal LCD |
Use Scenario: Powering dual-rail LCD drivers in Windows CE-based palmtops requiring stable ±15V under varying temperature and load conditions. IC Role / Device Role / Timing Role: Compact, thermally robust bias IC with wide input range (0.8V–5.5V) and guaranteed operation from –40°C to +85°C. Use Value: Maintains output regulation across battery discharge curve; 1.25V FB reference tolerance (±2%) ensures consistent contrast over lifetime. | Use Scenario: Providing reliable LCD bias in warehouse barcode scanners subjected to mechanical shock and intermittent power. IC Role / Device Role / Timing Role: Fault-tolerant boost converter with undervoltage lockout (2.2V typical) and robust LX switching (30.5V rating). Use Value: Prevents erratic display behavior during brown-out; 30V LX rating accommodates transient spikes in industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1771CSA+ | Wider VCC range (3V–20V); external MOSFET; no integrated switch; 300kHz max frequency. | Requires external FET and gate driver; better suited for >100mA loads and higher input voltages. | Choose MAX1771CSA+ only if higher output current (>50mA) or input voltage >5.5V is required. |
| TPS61040DBVR | Fixed 28V output limit; 0.5A switch; 500kHz switching; 25µA quiescent current; same SOT23-6 package. | Lacks selectable current limit and independent VIN/VCC architecture; less flexible for ultra-low-VIN battery systems. | Use TPS61040DBVR where pin compatibility and TI supply chain preference outweigh need for 30V headroom and 0.8V VIN capability. |
Compared with MAX1771CSA+ and TPS61040DBVR, the MAX1605EUT#TG16 uniquely combines 0.8V minimum VIN, integrated 30V switch, and three-level current limiting in a 6-pin SOT23-making it optimal for miniaturized, single-cell LCD bias where board space and battery voltage headroom are critical constraints.
Availability
MAX1605EUT#TG16 is available at Aetrix Electronics and suitable for LCD bias generators, cellular phone displays, palmtop computers, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed RoHS compliance.
Supply support for MAX1605EUT#TG16 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, communications, and consumer applications.
The MAX1605EUT#TG16 belongs to Maxim's LCD bias supply product line, engineered specifically for ultra-compact, low-quiescent-current DC-DC conversion in battery-powered portable displays with demanding voltage and size requirements.
FAQ
What is the minimum input voltage the MAX1605EUT#TG16 can boost from?
The MAX1605EUT#TG16 supports an inductor input voltage (VIN) as low as 0.8V while maintaining regulation - enabling direct connection to partially discharged single-cell Li+ batteries. This capability is independent of the 2.4V–5.5V VCC supply required for internal logic. The MAX1605EUT#TG16 achieves this through its dedicated VIN path and current-mode control architecture.
How does the LIM pin configure current limiting on the MAX1605EUT#TG16?
The LIM pin on the MAX1605EUT#TG16 selects peak inductor current in three discrete levels: connect to GND for 125mA, leave floating for 250mA, or tie to VCC for 500mA. This configuration directly scales the internal current-sense threshold and affects inductor size, output ripple, and maximum deliverable power. The MAX1605EUT#TG16 datasheet specifies corresponding ILX(MAX) tolerances across temperature and supply voltage.
Can the MAX1605EUT#TG16 generate negative output voltages?
Yes, the MAX1605EUT#TG16 can generate negative bias voltages by adding an external diode-capacitor charge-pump network to the LX pin (as shown in Figure 4 of the datasheet). Feedback remains connected to the positive rail, and the negative output tracks inversely - e.g., –19V when +18V is regulated. The MAX1605EUT#TG16 maintains stability and low ripple in this configuration with appropriate capacitor selection.
What is the recommended inductor value for typical MAX1605EUT#TG16 applications?
For most MAX1605EUT#TG16 designs targeting 10–20mA output at 18V, a 10µH surface-mount inductor (e.g., Coilcraft MSS5131-103) is recommended. Larger values (47–100µH) reduce ripple but limit startup at low VIN; smaller values (<4.7µH) increase ripple and EMI. Inductor saturation current must exceed the selected ILX(MAX) - e.g., ≥500mA for LIM=VCC operation. The MAX1605EUT#TG16 evaluation kit uses a 10µH part.
Does the MAX1605EUT#TG16 require external compensation components?
No, the MAX1605EUT#TG16 uses an internally compensated current-mode control loop and requires no external compensation components. Stability is ensured across all operating conditions with standard output capacitor types (1µF ceramic typical). A 10pF feedforward capacitor (CFF) between FB and LX is optional for improved transient response but not mandatory for basic regulation. The MAX1605EUT#TG16 datasheet provides layout guidelines instead of compensation networks.
MAX1605EUT#TG16 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 350mA (Switch)
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX1605EUT#TG16 FAQ
1.How can I place an order for MAX1605EUT#TG16 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1605EUT#TG16 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#TG16 reliable?
The price and inventory of MAX1605EUT#TG16 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1605EUT#TG16 is usually 5 days.
3.What payment methods are accepted for MAX1605EUT#TG16?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1605EUT#TG16 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1605EUT#TG16?
MAX1605EUT#TG16 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1605EUT#TG16 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#TG16?
For technical support, including MAX1605EUT#TG16 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1605EUT#TG16 requirements.
6.How does Aetrix verify that MAX1605EUT#TG16 is sourced from the original manufacturer or authorized distributors?
All MAX1605EUT#TG16 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#TG16 meets industry standards.
7.What is the process for return or replacement of MAX1605EUT#TG16?
All MAX1605EUT#TG16 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1605EUT#TG16, 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#TG16 part is unused and in its original packaging.
Return procedure for MAX1605EUT#TG16:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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