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Analog Devices Inc./Maxim Integrated MAX8595ZETA+T
- Part No.:
- MAX8595ZETA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 8-WDFN Exposed Pad
- Datasheet:
-
MAX8595ZETA+T.pdf
- Description:
- IC LED DRVR RGLTR PWM 25MA 8TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,493
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Product details
Overview
MAX8595ZETA+T from Maxim Integrated is a high-efficiency, 36V step-up DC-DC converter IC designed to drive 2–9 series-connected white LEDs with precise constant current regulation. It operates from 2.6V to 6.0V input, delivers up to 38V output, achieves 86% efficiency at typical loads, and maintains ±1.7% LED current accuracy over –40°C to +85°C - enabling uniform backlighting in compact handheld displays.
For engineers reviewing the MAX8595ZETA+T datasheet, MAX8595ZETA+T pinout, MAX8595ZETA+T application, or MAX8595ZETA+T equivalent, key selection considerations include its 1MHz PWM switching frequency, 0.1µF output capacitor requirement, integrated overvoltage protection (38V typ), ambient-temperature-independent current regulation, and TDFN-EP 3mm × 3mm package with exposed paddle for thermal management.
Technical Context
The MAX8595ZETA+T implements a current-mode boost topology with an internal 1MHz oscillator and n-channel MOSFET switch (1.35Ω RDS(ON) typ). It regulates LED current via feedback at the CS pin, where VCS is clamped to VCTRL/5 (0.300V typ) - enabling analog dimming across 0.24V–1.65V CTRL range. Soft-start is controlled by COMP pin voltage ramping through an internal current source.
Unlike the MAX8596X variant, the MAX8595ZETA+T lacks ambient-temperature derating; its CS regulation voltage remains fixed at 0.300V (±0.008V) across –40°C to +85°C. Shutdown is triggered when CTRL falls below 100mV for >8.2ms, reducing supply current to 0.3µA (typ) while discharging CCOMP via a 20kΩ internal resistor.
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 (2.4–3.6V) without external LDO pre-regulation. |
| Output Voltage Capability | Up to 38V (typ OVLO threshold) - sufficient to drive up to nine 3.4V white LEDs in series (30.6V forward drop) with margin. |
| LED Current Accuracy | ±1.7% - ensures consistent brightness across units and temperature, eliminating need for per-unit factory calibration. |
| Switching Frequency | 1.0MHz (typ) - enables use of small 22µH inductor and 0.1µF ceramic output capacitor, minimizing board area and input ripple (12mVP-P). |
| Shutdown Current | 0.3µA (typ) - extends battery life in always-on portable devices during display-off states. |
| Overvoltage Protection | 38V (typ) with 2V hysteresis - disables LX switching and initiates soft-start recovery when output exceeds safe LED string voltage. |
| Package Thermal Performance | TDFN-EP 3mm × 3mm × 0.8mm with exposed paddle - provides low θJA for continuous 1950mW power dissipation at +70°C ambient. |
Pinout & Package
MAX8595ZETA+T uses an 8-pin TDFN-EP (exposed paddle) package, 3mm × 3mm × 0.8mm, with lead-free finish. The exposed paddle must be soldered directly to a large PCB ground plane for optimal thermal performance and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Overvoltage sense input | Monitors output voltage; triggers OVLO shutdown if >38V (typ); requires 0.1µF ceramic capacitor to GND. |
| 2 IN | Main power input | Accepts 2.6V–6.0V supply; requires 2.2µF ceramic bypass capacitor placed adjacent to pin. |
| 3 CTRL | Brightness and shutdown control | Analog dimming input (0.24V–1.65V = 0–100% current); <100mV for 8.2ms initiates shutdown. |
| 4 CS | Current-sense feedback | Sets LED current via external sense resistor; regulated to VCTRL/5 = 0.300V (±0.008V) over full temp range. |
| 5 COMP | Compensation and soft-start node | Connects to 0.1µF capacitor to GND; controls loop stability, soft-start ramp, and PWM filtering. |
| 6 GND | Analog ground reference | Must be connected to PGND and exposed paddle; forms reference for error amplifier and bias circuits. |
| 7 PGND | Power ground return | High-current return path for LX switch and LED current; ties directly to exposed paddle and GND. |
| 8 LX | Switch node | Connects to inductor and Schottky diode anode; carries pulsed current up to 700mA peak; high-impedance in shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current LED driver | Regulates up to 25mA per LED across 2–9 series LEDs with ±1.7% accuracy - ensures pixel-level brightness uniformity in LCD backlights. |
| Dual-mode CTRL interface | Single pin supports analog dimming (0.24V–1.65V), direct PWM dimming (200Hz–200kHz), and logic-level shutdown - reduces BOM count and routing complexity. |
| Integrated soft-start | Gradually ramps COMP voltage to limit inrush current during power-up - prevents input rail sag and mechanical stress on LEDs. |
| Output overvoltage lockout | Disables switching and forces soft-start recovery when VOUT >38V - protects LEDs from catastrophic overvoltage due to open-circuit or component failure. |
| Low-noise 1MHz operation | Minimizes EMI and allows use of tiny passive components (0.1µF COUT, 22µH inductor) - critical for space-constrained mobile PCB layouts. |
Applications
| Smartphone LCD Backlight | e-Book Display Driver |
|---|---|
|
Use Scenario: Driving 6-series white LEDs in a 4.3-inch TFT-LCD panel for smartphone main display under variable battery voltage (3.3–4.1V). IC Role / Device Role / Timing Role: Constant-current boost controller regulating 20mA per LED with analog dimming via baseband processor GPIO. Use Value: Eliminates brightness variation across battery discharge cycle and ensures consistent color gamut by maintaining exact current matching between LEDs. |
Use Scenario: Powering 4-series white LEDs in a 6-inch e-ink frontlight system requiring flicker-free dimming down to 1% brightness. IC Role / Device Role / Timing Role: High-PSRR LED driver using direct PWM dimming at 32kHz to avoid visible artifacts in reflective displays. Use Value: 1MHz switching and integrated RC filtering at COMP enable clean 32kHz PWM-to-DC conversion without external components - reducing layout sensitivity and cost. |
| Industrial Handheld Scanner | Medical Portable Monitor |
|
Use Scenario: Illuminating 8-series white LEDs behind a ruggedized 3.5-inch resistive touchscreen used in warehouse scanners operating at –20°C to +70°C. IC Role / Device Role / Timing Role: Temperature-stable current source delivering 22mA per LED independent of ambient drift - no derating required. Use Value: Maintains calibrated brightness across industrial temperature extremes, supporting ISO/IEC 15416 barcode verification consistency. |
Use Scenario: Backlighting a 5-inch medical-grade LCD in a portable ultrasound device requiring Class II leakage compliance and zero audible noise. IC Role / Device Role / Timing Role: Low-ripple, low-EMI boost converter with 12mVP-P input ripple and shutdown current <0.5µA. Use Value: Meets IEC 60601-1 creepage/clearance requirements via minimal high-dV/dt node area and eliminates coil whine through 1MHz operation. |
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 |
|---|---|---|---|
| MAX1561ETA+T | Pin-compatible but lower 28V max output; 85% efficiency; no OVLO hysteresis; 2.5V min input. | Limited to ≤7 LEDs at 3.4V; less robust against open-circuit faults; unsuitable for 38V-tolerant designs. | Select only if output voltage headroom <32V suffices and OVLO hysteresis is noncritical. |
| LM3409QMYX/NOPB | Adjustable 1.25V current-sense threshold; external MOSFET; 40V max output; 1.6MHz switching. | Requires external high-side FET and gate driver; higher BOM count; supports higher current (>500mA) but less integrated. | Choose when >25mA per LED or programmable current scaling is required; not a drop-in replacement. |
Compared with MAX1561ETA+T, MAX8595ZETA+T offers higher output voltage margin and tighter current regulation; compared with LM3409QMYX/NOPB, it delivers lower system cost and smaller footprint via monolithic integration - making it optimal for space- and reliability-constrained portable backlighting.
Availability
MAX8595ZETA+T is available at Aetrix Electronics and suitable for smartphone LCD backlighting, e-book frontlight systems, industrial handheld scanners, and medical portable monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX8595ZETA+T 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 MAX8595ZETA+T belongs to Maxim's white LED backlight driver product line, engineered specifically for ultra-compact, high-efficiency constant-current boosting in battery-powered handheld displays with stringent thermal and EMI constraints.
FAQ
What is the maximum number of white LEDs the MAX8595ZETA+T can drive, and what determines that limit?
The MAX8595ZETA+T can drive up to nine white LEDs in series. This limit is determined by its 38V typical overvoltage lockout threshold and internal 36V-rated output stage - allowing sufficient headroom above the combined forward voltage of nine 3.4V LEDs (30.6V) while accommodating manufacturing tolerance and temperature drift. The IC regulates current, not voltage, so LED count is constrained by total string voltage, not current capability.
Does the MAX8595ZETA+T include ambient temperature derating like the MAX8596X?
No, the MAX8595ZETA+T does not implement ambient temperature derating. Its CS regulation voltage remains fixed at 0.300V (±0.008V) across –40°C to +85°C, providing stable LED current regardless of temperature. In contrast, the MAX8596X reduces CS clamp voltage above +42°C at –5.5mV/°C. This makes MAX8595ZETA+T ideal for applications requiring consistent brightness across temperature, such as medical or industrial displays.
What is the recommended capacitor for the COMP pin, and why is it critical?
A 0.1µF X5R or X7R ceramic capacitor must be connected from COMP to GND. This capacitor stabilizes the control loop, sets soft-start timing, and acts as a low-pass filter for direct PWM dimming signals applied to CTRL. Using a value outside the 0.1µF ±20% range risks instability, overshoot, or incomplete dimming response - especially at PWM frequencies near 200kHz. CCOMP must also be placed close to the pin with short traces.
How does the MAX8595ZETA+T achieve low input ripple, and what is the measured value?
The MAX8595ZETA+T achieves low input ripple through its 1MHz high-frequency switching architecture, which reduces energy storage requirements and minimizes low-frequency harmonics. With a 2.2µF input capacitor and 3.6V input, typical input ripple is specified at 12mVP-P. This low ripple prevents interference with sensitive RF sections in smartphones and reduces need for additional LC filtering - simplifying power integrity design.
Is the MAX8595ZETA+T pin-compatible with other Maxim LED drivers, and which ones?
Yes, the MAX8595ZETA+T is pin-compatible with the MAX1561 and MAX1599, sharing identical 8-pin TDFN-EP (3mm × 3mm) footprints and pin functions. However, differences exist in OVLO threshold (38V vs. 28V), efficiency (86% vs. 85%), and current regulation accuracy (±1.7% vs. ±2.5%). Layout reuse is possible, but system validation is required due to these parametric variations.
MAX8595ZETA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-WDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.6V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 32V
- Current - Output / Channel:
- 25mA
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TDFN (3x3)
MAX8595ZETA+T FAQ
1.How can I place an order for MAX8595ZETA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX8595ZETA+T 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 MAX8595ZETA+T reliable?
The price and inventory of MAX8595ZETA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX8595ZETA+T is usually 5 days.
3.What payment methods are accepted for MAX8595ZETA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX8595ZETA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX8595ZETA+T?
MAX8595ZETA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX8595ZETA+T 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 MAX8595ZETA+T?
For technical support, including MAX8595ZETA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX8595ZETA+T requirements.
6.How does Aetrix verify that MAX8595ZETA+T is sourced from the original manufacturer or authorized distributors?
All MAX8595ZETA+T 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 MAX8595ZETA+T meets industry standards.
7.What is the process for return or replacement of MAX8595ZETA+T?
All MAX8595ZETA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX8595ZETA+T, 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 MAX8595ZETA+T part is unused and in its original packaging.
Return procedure for MAX8595ZETA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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