MAX8596, MAX8596X:High-Efficiency, 36V Step-Up Converters with TA Derating Option for 2 to 9 White LEDs

The MAX8595X/MAX8596X drive up to nine white LEDs with constant current and high efficiency to provide LCD backlighting in cell phones, PDAs, and other handheld devices. The series connection allows the LED currents to be identical for uniform brightness and minimizes the number of traces to the LEDs. The MAX8595X regulates constant LED current over the entire temperature range. The MAX8596X features an ambient-temperature derating function to avoid over-driving the white LEDs during high ambient temperatures, enabling higher drive current below +42°C. A single Dual Mode™ input provides a simple means of brightness adjustment and on/off control. Fast 1MHz current-mode PWM operation allows for small input and output capacitors and a small inductor while minimizing ripple on the input supply/battery. Soft-start eliminates inrush current during startup. The MAX8595X/MAX8596X are available in a space-saving, 8-pin, 3mm x 3mm TDFN package.

Key Features
  • Up to Nine LEDs at 25mA
  • Temperature Derating Function to Allow Fewer LEDs for Same Light (MAX8596X)
  • 86% Efficiency (PLEDs / PIN)
  • 1.7% Current-Regulation Accuracy
  • Output Overvoltage Protection
  • Flexible Dimming Control
    • Analog
    • Direct-PWM Internal Filter
  • 1MHz PWM Switching Frequency
  • 0.1µF Output Capacitor
  • 12mVP-P Low Input Ripple
  • Soft-Start Eliminates Inrush Current
  • 2.6V to 6V Input Range
  • 0.3µA Shutdown Current
  • Pin Compatible with the MAX1561 and MAX1599
  • TDFN 3mm x 3mm x 0.8mm Package with Exposed Paddle
MAX8595X, MAX8596X: Typical Operating Circuit
MAX8595X, MAX8596X: Typical Operating Circuit
Applications/Uses
  • Cell Phones/Smartphones
  • e-Books and Subnotebooks
  • PDAs, Palmtops, and Wireless Handhelds
  • White LED Display Backlighting
DataSheet
titleDownload file
MAX8595-MAX8596X Data SheetMAX8595-MAX8596X.pdf
Parametrics
Part NumberBattery InputRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming ControlVCURR_SENSE
(mV)
POUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Oper. Freq.
(kHz)
Package/PinsBudgetary
Price
maxmaxminmaxmaxmaxSee Notes
MAX85951-Cell Li+Inductor Based91Series0.025200Analog
PWM
30012.660.7321000TDFN-EP/8$1.56 @1k
MAX8596TDFN-EP/8
Related Products
  • MAX1574:180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
  • MAX1575:White LED 1x/1.5x Charge Pump for Main and Sub-Displays
  • MAX1573:White LED 1x/1.5x Charge Pump in UCSP and Thin QFN
  • MAX1582:High-Efficiency Step-Up Converters for White LED Main and Subdisplay Backlighting
  • MAX1561:High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
  • MAX1599:High-Efficiency, 26V Step-Up Converters for Two to Six White LEDs
  • MAX1570:White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
  • MAX1912:1.5x/2x High-Efficiency White LED Charge Pumps
  • MAX1910:1.5x/2x High-Efficiency White LED Charge Pumps
  • MAX1916:Low-Dropout, Constant-Current Triple White LED Bias Supply
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX8596XETA+ActiveTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX8596XETA+TActiveTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX8596XETA-TNo Longer AvailableMAX8596XETA+TTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CNo
MAX8596YETA+TNo Longer AvailableMAX8596XETA+TTDFN-EP,;8 pin;9.6 mm²-40°C to +85°CLead Free
MAX8595-MAX8596X.pdf MAX8596
Driving LEDs in Battery-Operated Applications: Controlling Brightness Power Efficiently MAX8596
MAX8595-MAX8596X.pdf MAX8596