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Analog Devices Inc./Maxim Integrated MAX8596XETA+TGA8
- Part No.:
- MAX8596XETA+TGA8
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- -
- Datasheet:
-
MAX8596XETA+TGA8.pdf
- Description:
- INTEGRATED CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:3,646
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Product details
Overview
The MAX8596XETA+TGA8 from Maxim Integrated is a high-efficiency, 36V step-up DC-DC converter optimized for constant-current white LED backlighting in portable devices. It drives 2–9 series-connected LEDs at up to 25mA per string with 1.7% current-regulation accuracy, 86% peak efficiency, and ambient-temperature derating (starts at +42°C) - enabling higher brightness at normal temperatures while protecting LEDs under thermal stress. It is used in cell phones and smart phones requiring compact, thermally robust LCD backlight solutions.
For engineers reviewing the MAX8596XETA+TGA8 datasheet, MAX8596XETA+TGA8 pinout, MAX8596XETA+TGA8 application, or MAX8596XETA+TGA8 equivalent, key selection criteria include its TA-dependent current derating function, 1MHz PWM switching frequency, 0.1µF output capacitor requirement, 36V overvoltage protection threshold, and compatibility with analog/PWM dual-mode dimming control.
Technical Context
The MAX8596XETA+TGA8 operates as a current-regulated boost converter using an internal n-channel MOSFET switch (1.35Ω typical RDS(ON)) and error amplifier feedback via the CS pin. Its regulation loop maintains VCS = 0.343V (max) below +42°C, then reduces linearly at −5.5mV/°C up to +85°C - directly linking LED current to board temperature via the exposed-pad TDFN package.
It integrates soft-start (via COMP capacitor charging), shutdown detection (8.2ms delay below 100mV on CTRL), and overvoltage lockout (38V typ, 2V hysteresis). The 1MHz current-mode PWM architecture enables fast transient response, low input ripple (12mVP-P), and minimal passive component count - including a 0.1µF ceramic output capacitor and 22µH inductor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.6V to 6.0V - supports single-cell Li-ion (3.0–4.2V) and dual-cell alkaline/NiMH inputs without external LDO. |
| Output Voltage Capability | Up to 38V (typ) - sufficient to drive 9-series white LEDs (3.2V × 9 ≈ 29V) with margin for diode drop and tolerance. |
| LED Current Accuracy | ±1.7% - ensures uniform brightness across multi-LED strings without per-LED calibration. |
| Switching Frequency | 1.0MHz (typ) - enables use of small 22µH inductors and 0.1µF ceramic output capacitors, reducing board area and cost. |
| Shutdown Current | 0.3µA (typ) - minimizes battery drain during display-off states in always-on portable systems. |
| Ambient Derating Start | +42°C - initiates automatic LED current reduction only above this threshold, preserving full brightness in typical handheld operating conditions. |
| Overvoltage Protection | 38V (typ), 2V hysteresis - disables switching and enters soft-start recovery when output exceeds safe LED/diode ratings. |
Pinout & Package
MAX8596XETA+TGA8 is housed in an 8-pin, 3mm × 3mm × 0.8mm TDFN package with exposed paddle (EP) for thermal dissipation. The EP must be soldered to a solid ground plane. Pin 1 is marked by a "+" sign on lead-free variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Overvoltage sense input | Monitors output voltage; triggers OVLO shutdown if >38V; requires 0.1µF ceramic capacitor to GND. |
| 2 IN | Main power input | Accepts 2.6–6.0V supply; bypassed with 2.2µF ceramic capacitor directly to PGND/GND. |
| 3 CTRL | Brightness and shutdown control | Analog voltage (0.24–1.72V) sets LED current; <100mV for 8.2ms initiates shutdown; accepts direct PWM (200Hz–200kHz). |
| 4 CS | Current-sense feedback | Regulates to VCTRL/5 (max 0.343V); sets LED current via external sense resistor (e.g., 13Ω for 25mA). |
| 5 COMP | Compensation and soft-start node | Connects 0.1µF capacitor to GND; controls loop stability, soft-start ramp, and PWM filtering. |
| 6 GND | Analog ground reference | Must be tied to PGND and EP; forms low-impedance return for control circuitry. |
| 7 PGND | Power ground | High-current return path for LX switch and LED current; connected directly to EP and GND. |
| 8 LX | Switch node | Drives external inductor; high-impedance in shutdown; requires short, low-inductance trace to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Ambient-temperature derating | Reduces LED current above +42°C at −5.5mV/°C on CS, enabling higher baseline current without thermal runaway. |
| Dual-mode dimming interface | Single CTRL pin accepts analog voltage (0.24–1.72V) or logic-level PWM (200Hz–200kHz) - eliminates need for external dimming IC or RC filters. |
| Integrated overvoltage protection | Auto-shutdown at 38V output with 2V hysteresis and soft-start recovery - protects LEDs, diode, and PCB traces from fault conditions. |
| Ultra-low shutdown current | 0.3µA typical - extends battery life in sleep modes of smartphones and e-readers where display is inactive for extended periods. |
| Compact passive BOM | Requires only one inductor (22µH), two ceramics (2.2µF IN, 0.1µF OUT), one sense resistor, and one Schottky diode - simplifies layout and reduces bill-of-materials cost. |
Applications
| Smartphone LCD Backlight | e-Reader Display Driver |
|---|---|
|
Use Scenario: Driving 6–8 series white LEDs behind a 4.3"–6.0" TFT-LCD in a battery-powered smartphone with thermal constraints. IC Role / Device Role / Timing Role: Constant-current boost controller regulating LED string current with ambient-temperature derating to maintain brightness across −20°C to +60°C operating range. Use Value: Eliminates need for discrete thermal sensors or firmware compensation; delivers consistent luminance while extending LED lifetime under sustained high-temperature usage. |
Use Scenario: Powering a 5" e-ink or low-power LCD in an e-book reader with strict quiescent current and size requirements. IC Role / Device Role / Timing Role: High-efficiency LED driver with 0.3µA shutdown current and 1MHz switching - enabling rapid wake-from-sleep backlight activation and minimal standby drain. Use Value: Achieves >85% efficiency at 15mA load, allowing 2-week battery life on a single 1000mAh cell with daily 2-hour backlight usage. |
| PDA Display Backlight | Portable Medical Monitor |
|
Use Scenario: Illuminating a QVGA or VGA color LCD in legacy PDAs or industrial handhelds with variable input voltage (2.8–5.5V). IC Role / Device Role / Timing Role: Input-voltage-flexible boost converter supporting analog dimming via microcontroller DAC output on CTRL pin. Use Value: Maintains ±1.7% LED current accuracy across full input range and temperature, ensuring stable grayscale rendering without gamma correction drift. |
Use Scenario: Providing reliable, low-noise backlighting for a ruggedized medical tablet used in clinical environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Thermally aware LED driver that derates current only above +42°C - preserving full brightness during normal operation while preventing overheating in enclosed enclosures. Use Value: Meets IEC 60601-1 thermal safety requirements without external thermal management components, reducing system validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED backlight driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX8595XETA+T | No ambient-temperature derating; fixed CS clamp at 0.330V; identical pinout, package, and electrical specs otherwise. | Suitable for thermally stable environments or designs where maximum brightness must be maintained regardless of ambient temperature. | Select MAX8595XETA+T when thermal derating is unnecessary and consistent full-brightness operation is prioritized over LED longevity at elevated temperatures. |
| LM3409QMYX/NOPB | Adjustable current limit (external resistor), no integrated derating; requires external PWM generator for dimming; 1.25MHz switching. | Used in automotive or industrial LED lighting where AEC-Q100 qualification and wider temp range (−40°C to +125°C) are required. | Choose LM3409QMYX/NOPB only if AEC-Q100 compliance, higher junction temperature rating, or programmable current limit are mandatory - not a drop-in replacement. |
Compared with MAX8595XETA+T, the MAX8596XETA+TGA8 adds temperature-aware current limiting without changing footprint or control interface; versus LM3409QMYX/NOPB, it trades automotive qualification and external flexibility for smaller solution size, lower BOM count, and built-in thermal protection tailored to handheld consumer electronics.
Availability
MAX8596XETA+TGA8 is available at Aetrix Electronics and suitable for smartphone LCD backlighting, e-reader display drivers, PDA backlight systems, and portable medical monitor illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX8596XETA+TGA8 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 applications.
The MAX8596X belongs to Maxim's white LED backlight driver product line, designed specifically for space-constrained, battery-operated handheld devices requiring precise current regulation, thermal resilience, and minimal external components.
FAQ
What is the primary function of the MAX8596XETA+TGA8?
The MAX8596XETA+TGA8 is a constant-current, step-up DC-DC converter engineered to drive 2–9 series-connected white LEDs for LCD backlighting. It regulates LED current with ±1.7% accuracy, incorporates ambient-temperature derating starting at +42°C, and supports dual-mode dimming via its CTRL pin - making it ideal for smartphones, e-readers, and other portable displays where brightness consistency and thermal safety are critical. The MAX8596XETA+TGA8 integrates all necessary control circuitry in an 8-pin TDFN package.
How does the ambient-temperature derating feature work in the MAX8596XETA+TGA8?
The MAX8596XETA+TGA8 reduces its maximum regulated LED current above +42°C by lowering the CS pin reference voltage at −5.5mV/°C, down to a minimum of 106.5mV at +85°C. This directly scales LED current with board temperature (tracked via the exposed paddle), preventing thermal runaway while allowing higher baseline current at room temperature. Unlike the MAX8595XETA+T, the MAX8596XETA+TGA8 implements this function natively - no external sensor or firmware is needed. The MAX8596XETA+TGA8 achieves this through on-die thermal sensing tightly coupled to the package's EP.
Can the MAX8596XETA+TGA8 be used with both analog and PWM dimming?
Yes - the MAX8596XETA+TGA8 supports both analog and PWM dimming on a single CTRL pin. Applying a DC voltage between 0.24V and 1.72V sets LED current proportionally (ILED = VCTRL / (5 × RSENSE)). Alternatively, applying a logic-level PWM signal (200Hz–200kHz) directly to CTRL achieves flicker-free dimming, as the internal COMP capacitor and error amplifier act as a low-pass filter. This dual-mode capability eliminates external dimming circuitry. The MAX8596XETA+TGA8 handles both methods without hardware modification or mode selection pins.
What is the recommended output capacitor value for the MAX8596XETA+TGA8?
The MAX8596XETA+TGA8 is characterized and optimized for use with a 0.1µF ceramic capacitor (X5R/X7R dielectric) from OUT to GND. This value ensures stable operation, meets the 38V overvoltage protection timing, and maintains low output ripple while minimizing board area. Larger values may reduce ripple further but risk instability if exceeding 10× the COMP capacitor (0.1µF), as specified in the datasheet. The MAX8596XETA+TGA8's design relies on this exact COUT value for proper OVLO response and loop dynamics.
Is the MAX8596XETA+TGA8 pin-compatible with other Maxim LED drivers?
Yes - the MAX8596XETA+TGA8 is pin-compatible with the MAX1561 and MAX1599, sharing identical 8-pin TDFN pinout, footprint, and basic control interface. However, it is not pin-compatible with the MAX8595XETA+T due to differences in CS reference voltage (0.343V vs. 0.330V) and derating behavior - though both share the same package and pin assignments. System-level validation is required before substituting the MAX8596XETA+TGA8 into existing MAX1561/MAX1599 layouts due to differing compensation and protection thresholds.
MAX8596XETA+TGA8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- -
MAX8596XETA+TGA8 FAQ
1.How can I place an order for MAX8596XETA+TGA8 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8596XETA+TGA8 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 MAX8596XETA+TGA8 reliable?
The price and inventory of MAX8596XETA+TGA8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8596XETA+TGA8 is usually 5 days.
3.What payment methods are accepted for MAX8596XETA+TGA8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8596XETA+TGA8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8596XETA+TGA8?
MAX8596XETA+TGA8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8596XETA+TGA8 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 MAX8596XETA+TGA8?
For technical support, including MAX8596XETA+TGA8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8596XETA+TGA8 requirements.
6.How does Aetrix verify that MAX8596XETA+TGA8 is sourced from the original manufacturer or authorized distributors?
All MAX8596XETA+TGA8 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 MAX8596XETA+TGA8 meets industry standards.
7.What is the process for return or replacement of MAX8596XETA+TGA8?
All MAX8596XETA+TGA8 units undergo pre-shipment inspection (PSI). If there is an issue with MAX8596XETA+TGA8, 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 MAX8596XETA+TGA8 part is unused and in its original packaging.
Return procedure for MAX8596XETA+TGA8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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