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Analog Devices Inc./Maxim Integrated MAX1573ETE+TG104
- Part No.:
- MAX1573ETE+TG104
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX1573ETE+TG104.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
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Product details
Overview
MAX1573ETE+TG104 from Maxim Integrated is a white LED fractional charge-pump driver IC that regulates constant current to up to four LEDs for uniform display brightness in portable devices. It operates from 2.7V to 5.5V input, delivers up to 28mA per LED, achieves up to 92% efficiency across Li+ battery discharge, and uses adaptive 1x/1.5x switching to maintain regulation down to 2.25V undervoltage lockout - enabling full-brightness operation in smartphones and handheld color displays.
For engineers reviewing the MAX1573ETE+TG104 datasheet, MAX1573ETE+TG104 pinout, MAX1573ETE+TG104 application, or MAX1573ETE+TG104 equivalent, key selection considerations include its dual-digital dimming control (EN1/EN2), 0.2% LED current matching, 1MHz fixed-frequency operation for low EMI, ultra-low 0.1µA shutdown current, and compatibility with 4mm × 4mm thin QFN packaging for space-constrained PCB layouts.
Technical Context
The MAX1573ETE+TG104 implements a proprietary adaptive 1x/1.5x fractional charge-pump topology with fixed 1MHz switching frequency, eliminating external Schottky diodes and ballast resistors. Its output regulation dynamically switches between 1x (buck-like) and 1.5x (boost-like) modes based on real-time LED cathode voltage feedback from LED1–LED4 pins, ensuring seamless transition without brightness flicker.
It integrates four independent low-dropout current regulators (40mV dropout typical), soft-start circuitry limiting inrush current, thermal shutdown at +160°C with 20°C hysteresis, and true shutdown mode that places OUT in high-impedance state while actively managing transfer capacitor node biasing - all controlled via two logic-level enable/dimming inputs (EN1, EN2) and one analog SET pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li+ battery discharge curve (4.2V → 2.7V) without brightness loss. |
| LED Drive Capability | Up to 28mA per channel (4 channels) - sufficient for high-brightness white LEDs in small-form-factor displays. |
| Current Matching Accuracy | ±0.2% - ensures uniform luminance across all four LEDs, critical for color display backlight consistency. |
| Efficiency | Up to 92% (PLEDs/PBATT) - minimizes power loss and thermal load in battery-powered systems. |
| Shutdown Current | 0.1µA - extends standby battery life in always-on portable devices. |
| Switching Frequency | 1MHz fixed - enables use of tiny 0.22µF–1µF ceramic capacitors and reduces EMI filtering burden. |
| Undervoltage Lockout | 2.45V typical with 35mV hysteresis - prevents erratic operation during deep battery discharge. |
Pinout & Package
MAX1573ETE+TG104 is packaged in a 16-pin thin QFN (4mm × 4mm × 0.8mm body height) with exposed thermal pad. Pin 1 is marked by a "+" sign on lead-free packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (C2P) | Transfer Capacitor 2 Positive | Connects to positive terminal of second flying capacitor; critical for 1.5x charge-pump operation. |
| 2 (OUT) | Regulated Output | High-impedance during shutdown; supplies anode-side voltage to all four LEDs; bypassed with 1µF ceramic cap to GND. |
| 3 (EN1) | Digital Enable/Dimming Input 1 | Logic-controlled pin for on/off and brightness level selection (with EN2); accepts 0.4V/1.6V logic thresholds. |
| 4 (N.C.) | No Connection | Unbonded pad; must be left floating or grounded per layout guidelines - no electrical function. |
| 5 (EN2) | Digital Enable/Dimming Input 2 | Paired with EN1 to select 4 states: shutdown, 1/10, 3/10, or full LED current (219×ISET). |
| 6 (SET) | Bias Current Reference Input | Sets full-scale LED current via external resistor (ISET = 600mV/RSET); leakage <1µA in shutdown. |
| 7 (LED2) | LED2 Cathode Feedback | Provides regulation feedback from LED2 cathode; lowest-voltage LED_ pin determines output regulation point. |
| 8 (LED1) | LED1 Cathode Feedback | Same function as LED2; connects to cathode of first LED; tied to IN if LED1 unused. |
| 9 (LED4) | LED4 Cathode Feedback | Enables 4-LED configuration; regulation adapts to lowest forward voltage among all active LED_ pins. |
| 10 (LED3) | LED3 Cathode Feedback | Supports third LED channel; allows flexible 1–4 LED configurations without reprogramming. |
| 11 (GND) | Power Ground | Main return path for all internal circuits and external capacitors; requires low-inductance connection to solid ground plane. |
| 12 (N.C.) | No Connection | Unbonded pad; no electrical connection - leave unconnected or tie to GND per board layout best practice. |
| 13 (C1N) | Transfer Capacitor 1 Negative | Negative terminal of first flying capacitor; forms charge-transfer path with C1P and internal switches. |
| 14 (IN) | Supply Input | Primary power input (2.7–5.5V); bypassed with 1µF ceramic capacitor close to pin for low-impedance source. |
| 15 (C2N) | Transfer Capacitor 2 Negative | Completes second flying capacitor loop; works with C2P to enable 1.5x voltage multiplication. |
| 16 (C1P) | Transfer Capacitor 1 Positive | Positive terminal of first flying capacitor; essential for both 1x and 1.5x charge-pump phases. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1x/1.5x Charge Pump | Automatically transitions between modes based on LED cathode voltage - eliminates visible flicker during battery sag. |
| 0.2% LED Current Matching | Ensures consistent brightness across all four channels without manual calibration or trimming. |
| Logic or PWM Dimming Control | Supports both 2-bit digital (EN1/EN2) and analog PWM-to-current conversion via SET pin - no extra ICs required. |
| Ultra-Low Shutdown Current | 0.1µA typical - preserves battery charge over weeks of standby in always-connected handhelds. |
| No External Schottky Diode Required | Integrated switch architecture eliminates discrete diode, reducing BOM count and PCB footprint. |
| Output Overvoltage & Thermal Protection | Shuts down at >160°C and limits output voltage during fault conditions - protects LEDs and system integrity. |
Applications
| Smartphone Backlight | Digital Camera LCD Illumination |
|---|---|
|
Use Scenario: Driving four white LEDs behind a 3.5-inch TFT-LCD in a battery-powered smartphone with 3.7V Li+ cell. IC Role / Device Role / Timing Role: Constant-current LED driver with adaptive voltage boosting to sustain brightness as battery discharges from 4.2V to 2.7V. Use Value: Maintains uniform display luminance without software compensation, extending usable battery runtime by avoiding premature dimming. |
Use Scenario: Powering RGBW backlight for a 2.4-inch color LCD in a compact digital camera with auto-focus and video recording. IC Role / Device Role / Timing Role: High-efficiency charge-pump regulator delivering stable 25mA per LED with <10µs dimming response for scene-based brightness control. Use Value: Enables rapid brightness adjustment during video capture without visible stepping or delay, improving user experience. |
| MP3 Player OLED Display | PDA Keypad Illumination |
|
Use Scenario: Supplying regulated current to four discrete white LEDs illuminating icons on a monochrome OLED display in an audio player. IC Role / Device Role / Timing Role: Low-quiescent-current LED driver supporting PWM dimming up to 50kHz for smooth brightness control. Use Value: Achieves flicker-free dimming at audible frequencies while consuming <2µA average current in standby - doubling idle time. |
Use Scenario: Controlling eight-key backlight (2×4 array) in a legacy PDA with limited PCB area and strict thermal budget. IC Role / Device Role / Timing Role: Four-channel current sink with shared SET resistor and independent cathode feedback for per-key intensity tuning. Use Value: Reduces component count by 60% vs. discrete transistor solutions while enabling individual key brightness calibration via RSET selection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1576ETE+ | Higher drive capability (35mA/LED), adds I²C interface and fault reporting; same 16-pin QFN package. | Requires firmware integration for dimming control; suited for systems needing diagnostics or dynamic current scaling. | Select MAX1576ETE+ when system-level intelligence (e.g., ambient light adaptation or LED health monitoring) is required. |
| TPS61160DRVR | Inductor-based boost converter; 30mA/LED max; 1.2MHz switching; requires external inductor and diode. | Higher peak EMI and larger solution size due to magnetic components; less efficient below 3.2V input. | Choose TPS61160DRVR only if higher output voltage headroom (>24V) or multi-string flexibility is needed beyond MAX1573ETE+TG104's 4-LED limit. |
Compared with MAX1576ETE+, MAX1573ETE+TG104 offers simpler implementation with pure hardware dimming and lower BOM cost; versus TPS61160DRVR, it delivers smaller footprint, lower EMI, and better low-voltage efficiency - making it optimal for compact, battery-sensitive designs where four-LED backlight suffices.
Availability
MAX1573ETE+TG104 is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera illumination, MP3 player OLED displays, PDA keypad lighting, and other handheld color-display applications requiring stable component supply and long-term lifecycle support.
Supply support for MAX1573ETE+TG104 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 MAX1573ETE+TG104 belongs to Maxim's white LED backlight driver product line, engineered specifically for space-constrained, battery-operated handheld devices requiring flicker-free, high-efficiency, and digitally controllable LED current regulation.
FAQ
What is the maximum LED current per channel supported by the MAX1573ETE+TG104?
The MAX1573ETE+TG104 supports up to 28mA per LED channel when configured with appropriate RSET and operating in full-brightness mode (EN1 = EN2 = high). This value is confirmed in the Electrical Characteristics table under "Maximum LED_ Sink Current" with test conditions VIN ≥ 3.4V and ISET = 130µA. The actual current scales linearly with RSET and EN1/EN2 state per the formula ILED = K × 0.6V / RSET, where K = 219 for full scale.
Does the MAX1573ETE+TG104 require an external Schottky diode?
No, the MAX1573ETE+TG104 does not require an external Schottky diode. Its proprietary switched-capacitor architecture integrates all necessary switching elements internally, eliminating the need for external diodes - a key feature explicitly stated in the datasheet's Features section and validated in the Typical Operating Circuit diagram.
How does the MAX1573ETE+TG104 handle low-input-voltage conditions during battery discharge?
The MAX1573ETE+TG104 handles low-input-voltage conditions using adaptive 1x/1.5x mode switching. When input drops near dropout, it seamlessly transitions to 1.5x charge-pump mode to maintain regulation at the lowest LED cathode voltage (as low as 150mV). This ensures constant brightness down to 2.25V undervoltage lockout - verified in the Efficiency vs. Li+ Battery Discharge graph and Detailed Description section.
Can the MAX1573ETE+TG104 drive fewer than four LEDs?
Yes, the MAX1573ETE+TG104 can drive one to four LEDs. Unused LEDx pins (e.g., LED3, LED4) should be connected to IN to disable their feedback path, allowing regulation to track only the active LED cathodes. This configuration flexibility is documented in the Pin Description table and Typical Operating Circuit notes.
What is the thermal shutdown threshold for the MAX1573ETE+TG104?
The MAX1573ETE+TG104 activates thermal shutdown at +160°C with 20°C hysteresis, meaning it resumes operation after cooling to approximately +140°C. This specification is listed in the Absolute Maximum Ratings table and further explained in the Thermal Shutdown section of the datasheet, ensuring reliable protection under sustained high-load conditions.
MAX1573ETE+TG104 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Type:
- -
- Topology:
- -
- Internal Switch(s):
- -
- Number of Outputs:
- -
- Voltage - Supply (Min):
- -
- Voltage - Supply (Max):
- -
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX1573ETE+TG104 FAQ
1.How can I place an order for MAX1573ETE+TG104 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1573ETE+TG104 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 MAX1573ETE+TG104 reliable?
The price and inventory of MAX1573ETE+TG104 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1573ETE+TG104 is usually 5 days.
3.What payment methods are accepted for MAX1573ETE+TG104?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1573ETE+TG104 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1573ETE+TG104?
MAX1573ETE+TG104 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1573ETE+TG104 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 MAX1573ETE+TG104?
For technical support, including MAX1573ETE+TG104 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1573ETE+TG104 requirements.
6.How does Aetrix verify that MAX1573ETE+TG104 is sourced from the original manufacturer or authorized distributors?
All MAX1573ETE+TG104 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 MAX1573ETE+TG104 meets industry standards.
7.What is the process for return or replacement of MAX1573ETE+TG104?
All MAX1573ETE+TG104 units undergo pre-shipment inspection (PSI). If there is an issue with MAX1573ETE+TG104, 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 MAX1573ETE+TG104 part is unused and in its original packaging.
Return procedure for MAX1573ETE+TG104:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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