MAX1570ETE ,White LED Current Regulator with 1x/1.5x High-Efficiency Charge PumpApplicationsWhite LED BacklightingCell Phones and Smart PhonesOrdering InformationPDA and Palmtop C ..
MAX1570ETE+ ,White LED Current Regulator with 1x/1.5x High-Efficiency Charge PumpApplications♦2White LED BacklightingCell Phones and Smart PhonesOrdering InformationPDA and Palmtop ..
MAX1572ETC250 ,800mA, 2MHz, PWM DC-to-DC Step-Down Converter with RESETApplicationsMAX1572ETC130 -40°C to +85°C 12 Thin QFN-EP**Cell Phones and Smart PhonesMAX1572ETC150 ..
MAX1573ETE ,White LED 1x/1.5x Charge Pump in UCSP and Thin QFNFeaturesThe MAX1573 fractional charge pump drives up to four ♦ Proprietary Adaptive 1x/1.5x Modeswh ..
MAX1573ETE+ ,White LED 1x/1.5x Charge Pump in UCSP and Thin QFNApplicationsCell Phones, Smart PhonesOrdering InformationPDAs, Digital Cameras, CamcordersPART TEMP ..
MAX1573ETE+T ,White LED 1x/1.5x Charge Pump in UCSP and Thin QFNApplicationsCell Phones, Smart PhonesOrdering InformationPDAs, Digital Cameras, CamcordersPART TEMP ..
MAX4236EUT+ ,SOT23, Very High Precision, 3V/5V Rail-to-Rail Op Ampsapplications with +3V or +5V singleIncludes Negative Railpower supplies. The MAX4236/MAX4237 are sp ..
MAX4236EUT+T ,SOT23, Very High Precision, 3V/5V Rail-to-Rail Op AmpsFeaturesThe MAX4236/MAX4237 are high-precision op amps♦ Ultra-Low Offset Voltagethat feature an exc ..
MAX4237BESA ,SOT23 / Very High Precision / 3V/5V Rail-to-Rail Op AmpsApplications
MAX1570ETE
White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
General DescriptionThe MAX1570 fractional charge pump drives up to five
white LEDs with regulated constant current for uniform
intensity. The MAX1570 maintains the highest possible
efficiency over the full 1-cell lithium-ion (Li+) battery
input voltage range by utilizing a 1x/1.5x fractional
charge pump and very-low-dropout current regulators.
The MAX1570 operates with 1MHz fixed-frequency
switching, allowing for tiny external components. The
regulation scheme is optimized to ensure low EMI and
low input ripple.
An external resistor sets the full-scale LED current,
while two digital inputs control on/off and select
between three levels of brightness. A pulse-width mod-
ulation (PWM) signal can also be used to modulate LED
brightness.
The MAX1570 is available in 16-pin 4mm ✕4mm Thin
QFN packaging (0.8mm max height).
ApplicationsWhite LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Portable MP3 Players
Digital Cameras and Camcorders
FeaturesExcellent 0.3% LED-to-LED Current Matching 30mA/LED Drive CapabilityProprietary 1x/1.5x Modes for Ultra-High
EfficiencyLow Input Ripple and EMIEliminates Ballast ResistorsDigital or PWM LED Dimming Control0.1µA Shutdown Current2.7V to 5.5V Supply Voltage RangeSoft-Start Limits Inrush CurrentThermal-Shutdown ProtectionNo External Inductor, Schottky, or Zener Diode
RequiredTiny 16-Pin 4mm✕
4mm Thin QFN Package
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Pin Configuration
Ordering Information
Typical Operating Circuit19-2526; Rev 0; 7/02
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN, OUT, EN1, EN2 to GND......................................-0.3V to +6V
SET, LED1, LED2, LED3, LED4,
LED5 to GND...........................................-0.3V to (VIN+ 0.3V)
PGND to GND..........................................................-0.3 to +0.3V
C1N, C2N to GND..........................................-0.3V to (VIN+ 1V)
C1P, C2P to GND..........................................-0.3V to the greater
(VOUT+ 1V) or (VIN+ 1V)
OUT Short Circuit to GND..............................................Indefinite
Continuous Power Dissipation (TA= +70°C)
16-Pin Thin QFN (derate 16.9 mW/°C).......................1349mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VIN= 3.6V, GND = PGND = 0, EN1 = EN2 = IN, CIN= C1 = C2 = 1µF, COUT= 4.7µF, TA
= 0°C to +85°C, unless otherwise noted.
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
ELECTRICAL CHARACTERISTICS
(VIN= 3.6V, GND = PGND = 0, EN1 = EN2 = IN, CIN= C1 = C2 = 1µF, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 3.6V, GND = PGND = 0, EN1 = EN2 = IN, CIN= C1 = C2 = 1µF, COUT= 4.7µF, TA= 0°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.)
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Note 1:Dropout voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 20% from the value at LED_ = 1V.
Note 2:Dropout voltage is defined as the LED_ to GND voltage at which current sink into LED_ drops 10% from the value at LED_ = 1V.
Note 3:Specifications to -40°C are guaranteed by design and not production tested.
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
Typical Operating Characteristics
(EN1 = EN2 = IN, CIN= 1µF, C1 = C2 = 1µF, COUT= 4.7µF, RSET= 9.09kΩ, TA= +25°C, unless otherwise noted.)
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
LED CURRENT vs. SUPPLY VOLTAGE
MAX1570 toc10
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
LED CURRENT (mA)3510-15
LED CURRENT vs. TEMPERATURE
(VIN = 3.3V, RSET = 7.5kΩ)MAX1570 toc11
TEMPERATURE (°C)
LED CURRENT vs. RSETMAX1570 toc12
RSET (kΩ)
LED CURRENT (mA)
Typical Operating Characteristics (continued)
(EN1 = EN2 = IN, CIN= 1µF, C1 = C2 = 1µF, COUT= 4.7µF, RSET= 9.09kΩ, TA= +25°C, unless otherwise noted.)
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
