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Analog Devices Inc./Maxim Integrated MAX1605ETT+
- Part No.:
- MAX1605ETT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX1605ETT+.pdf
- Description:
- IC REG BOOST ADJ 350MA 6TDFN
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Product details
Overview
The MAX1605ETT+ from Maxim Integrated is a 30V internal-switch boost DC-DC converter in a 6-pin TDFN (3mm × 3mm) package, operating from a 2.4V–5.5V VCC supply while boosting input voltages as low as 0.8V up to 30V output. It integrates a 0.5A N-channel MOSFET, supports selectable current limits (125/250/500mA), and delivers 88% efficiency at 10mA load with 18μA quiescent current - ideal for compact LCD bias generation in portable electronics.
For engineers reviewing the MAX1605ETT+ datasheet, MAX1605ETT+ pinout, MAX1605ETT+ application, or MAX1605ETT+ equivalent, key selection criteria include its ultra-low ICC, programmable LX current limit via LIM pin, high-voltage 30V LX rating, and dual-supply capability (separate VIN and VCC rails) enabling operation from sub-1V battery sources.
Technical Context
The MAX1605ETT+ employs a minimum-off-time, current-limited control architecture with fixed maximum on-time (9–17µs) and adjustable peak inductor current via the LIM pin. Its error amplifier compares FB voltage (1.25V threshold) against a resistive divider to regulate output voltage across 0.8V–30V range.
It features separate power domains: VCC (2.4V–5.5V) powers internal logic and gate drive, while VIN (0.8V–VOUT) supplies the inductor directly - enabling true single-cell Li+ or NiMH operation. Shutdown mode reduces ICC to 0.1μA and places LX in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Range | Adjustable from VIN (as low as 0.8V) to 30V - enables direct biasing of high-voltage LCD segments without external charge pumps. |
| Internal Switch Rating | 30V drain-source breakdown, 0.5A typical current limit - supports robust 18V–20V LCD bias rails with margin. |
| Quiescent Current | 18μA typical - minimizes battery drain in always-on display subsystems. |
| Switching Frequency | Up to 500kHz - allows use of small 10µH surface-mount inductors and compact ceramic output capacitors. |
| LX On-Resistance | 1Ω max at VCC = 3.3V - limits conduction loss and thermal rise under 10–20mA bias loads. |
| Feedback Threshold | 1.25V ±25mV - sets precise output regulation via standard resistor divider; low 100nA input bias enables high-impedance networks. |
| Shutdown Current | 0.1μA - ensures near-zero standby power when display is inactive. |
Pinout & Package
MAX1605ETT+ uses a 6-pin TDFN package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad (EP) connected to GND for improved power dissipation (1951mW at +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SHDN | Active-low shutdown control | Pulling low disables switching, reduces ICC to 0.1μA, and places LX in high-Z - critical for system-level power sequencing. |
| VCC | IC supply input (2.4V–5.5V) | Must be bypassed with ≥0.1µF ceramic capacitor; powers internal logic, gate driver, and reference - independent of VIN rail. |
| GND | Power and signal ground | Common return for VCC, LX, FB, and LIM; requires low-inductance connection to PCB ground plane to minimize noise coupling. |
| LX | Switch node (drain of internal N-MOSFET) | Connects to inductor; rated for 30.5V max; high-impedance during shutdown - must route short and wide to reduce EMI and ringing. |
| LIM | Inductor current limit select | Logic level determines peak switch current: GND = 125mA, floating = 250mA, VCC = 500mA - enables optimization of inductor size vs. output current. |
| FB | Feedback input (1.25V threshold) | Connects to resistor divider from VOUT; 100nA max bias current allows use of >100kΩ resistors without regulation error. |
Key Features
| Feature | Design Value |
|---|---|
| Separate VIN and VCC supplies | Enables operation from 0.8V battery (VIN) while maintaining stable 3.3V logic bias (VCC) - eliminates need for pre-regulator in ultra-low-voltage systems. |
| Selectable current limit | Three discrete levels (125/250/500mA) set by LIM pin state - allows trade-off between inductor size, output ripple, and efficiency in space-constrained designs. |
| High LX voltage rating | 30.5V absolute max - supports reliable 20V+ LCD bias rails with safety margin, unlike 20V-rated competitors. |
| Low quiescent current | 18μA typical - extends battery life in handheld devices where display bias remains active during sleep modes. |
| Soft-start via extended off-time | Initial minimum off-time increases to 3.8–6.0µs when FB < 0.8V - prevents inrush current into large output capacitors during startup. |
Applications
| Small LCD Bias Generators | Cellular Phone Display Power |
|---|---|
Use Scenario: Generating +18V and –19V bias rails for monochrome STN LCD panels in feature phones. IC Role / Device Role / Timing Role: Primary step-up converter for positive rail; configured with external diode-capacitor network (D1–D3, C3–C4) to derive negative rail. Use Value: Eliminates need for dual-output IC or discrete charge pump; achieves <1% output regulation error using only two external resistors (R1/R2 = 240kΩ/16.5kΩ) and 0.01µF feedback capacitor. | Use Scenario: Providing regulated 20V bias for backlit TFT-LCD modules in GSM handsets powered by single Li+ cell. IC Role / Device Role / Timing Role: High-efficiency boost converter with shutdown control synchronized to display enable signal. Use Value: Delivers 20mA at 20V from 3.6V Li+ input with 88% efficiency; 0.1μA shutdown current prevents battery drain during screen-off periods. |
| Palmtop Computer Display Supply | Handheld Terminal LCD Power |
Use Scenario: Powering dual-rail (+15V/–15V) LCD bias in Windows CE-based palmtops with tight board area constraints. IC Role / Device Role / Timing Role: Single-chip solution for positive rail; negative rail derived via charge-pump topology referenced to LX node. Use Value: 6-pin TDFN footprint (3mm × 3mm) saves >40% board area vs. SO-8 alternatives; 500kHz switching enables 10µH inductor (2.5mm × 2.0mm) instead of bulkier 47µH parts. | Use Scenario: Driving segmented LCDs in industrial handheld terminals operating from 1.2V NiMH batteries. IC Role / Device Role / Timing Role: Ultra-low-input boost regulator leveraging separate VIN/VCC architecture to start from 0.8V battery voltage. Use Value: Maintains regulation down to 0.8V VIN while VCC is supplied from auxiliary 3.3V rail - extends usable battery range by 20% compared to single-supply boosters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRVR | Fixed 28V LX rating; no separate VIN/VCC - requires ≥1.8V input; 2.5MHz switching; 0.17A switch. | Better suited for higher-frequency, lower-current apps (e.g., white LED drivers); lacks 0.8V startup capability. | Choose TPS61040DRVR only if system uses ≥1.8V input and prioritizes smaller inductors over ultra-low-VIN operation. |
| LT1930ES5#TRMPBF | 36V LX rating; 1.2MHz fixed frequency; 0.6A switch; requires external compensation; no LIM pin. | Higher voltage headroom and faster transient response, but larger BOM count and no programmable current limit. | Prefer LT1930ES5#TRMPBF when output >25V or fast load steps demand tighter regulation, accepting added design complexity. |
Compared with TPS61040DRVR and LT1930ES5#TRMPBF, the MAX1605ETT+ uniquely supports 0.8V input startup with separate VIN/VCC rails and offers pin-selectable current limiting - making it optimal for legacy low-voltage battery-powered LCD bias where simplicity, board area, and deep discharge tolerance are critical.
Availability
MAX1605ETT+ is available at Aetrix Electronics and suitable for small LCD bias generators, cellular phone display power, and palmtop computer display supply requiring stable component supply across long-life portable electronics programs.
Supply support for MAX1605ETT+ 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 MAX1605 product line delivers compact, high-voltage boost converters optimized for LCD bias generation in space- and power-constrained portable devices - emphasizing ultra-low quiescent current, wide input range, and integrated switch protection.
FAQ
What is the minimum input voltage the MAX1605ETT+ can boost from?
The MAX1605ETT+ can boost from an inductor input voltage (VIN) as low as 0.8V while maintaining regulation - enabled by its separate VIN and VCC supply architecture. The IC's VCC rail still requires 2.4V–5.5V, typically supplied from a regulated auxiliary source or higher-voltage battery tap. This dual-rail design allows the MAX1605ETT+ to operate from deeply discharged single-cell batteries that fall below 1.0V, extending runtime in portable LCD applications.
How does the LIM pin configure current limiting on the MAX1605ETT+?
The LIM pin on the MAX1605ETT+ 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. This configuration directly controls the internal current-sense threshold and is validated across temperature (-40°C to +85°C). The selected limit determines inductor saturation requirements, output ripple magnitude, and achievable output power - allowing designers to optimize for size, efficiency, or load capability without changing the MAX1605ETT+ footprint.
Can the MAX1605ETT+ generate negative output voltages?
Yes, the MAX1605ETT+ can generate negative output voltages using an external diode-capacitor charge-pump circuit connected to the LX pin, as shown in Figure 4 of the datasheet. In this configuration, the standard feedback loop regulates the positive output (e.g., +18V), while D1, D2, C3, and C4 form a voltage inverter to produce a corresponding negative rail (e.g., –19V). The MAX1605ETT+'s 30.5V LX rating and low FB input bias current (≤100nA) ensure stable operation and minimal loading error in this topology - commonly used for STN LCD segment biasing.
What is the thermal performance difference between the MAX1605ETT+ and MAX1605EUT+?
The MAX1605ETT+ in 6-pin TDFN (3mm × 3mm) has significantly higher thermal performance than the MAX1605EUT+ in 6-pin SOT23: its continuous power dissipation at +70°C is 1951mW (derating 24.4mW/°C above +70°C), versus 696mW for the SOT23 (derating 8.7mW/°C). This 2.8× improvement stems from the TDFN's exposed thermal pad and lower junction-to-board thermal resistance - enabling the MAX1605ETT+ to sustain higher output currents (e.g., 20mA at 20V) in compact layouts without forced airflow or heatsinking.
Does the MAX1605ETT+ require an external Schottky diode?
Yes, the MAX1605ETT+ requires an external Schottky diode (e.g., MBRS0530 or EP05Q03L) in the standard boost configuration. The IC integrates only the high-side N-channel MOSFET switch (LX node); the diode provides the return path for inductor current during the switch-off phase. A Schottky type is mandatory due to the MAX1605ETT+'s up to 500kHz switching frequency - standard PN diodes would exhibit excessive reverse recovery losses and reduced efficiency. Diode selection must meet ≥30V reverse voltage rating and ≥500mA average current handling for full-load operation.
MAX1605ETT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
MAX1605ETT+ FAQ
1.How can I place an order for MAX1605ETT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1605ETT+ 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 MAX1605ETT+ reliable?
The price and inventory of MAX1605ETT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1605ETT+ is usually 5 days.
3.What payment methods are accepted for MAX1605ETT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1605ETT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1605ETT+?
MAX1605ETT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1605ETT+ 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 MAX1605ETT+?
For technical support, including MAX1605ETT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1605ETT+ requirements.
6.How does Aetrix verify that MAX1605ETT+ is sourced from the original manufacturer or authorized distributors?
All MAX1605ETT+ 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 MAX1605ETT+ meets industry standards.
7.What is the process for return or replacement of MAX1605ETT+?
All MAX1605ETT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1605ETT+, 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 MAX1605ETT+ part is unused and in its original packaging.
Return procedure for MAX1605ETT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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