MAX1570ETE+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX1570ETE+
White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump
General Description
The 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).
Applications
White 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
SETEN1PGNDC1N
LED5
GND
EN2C1P
LED4
LED3
LED2
LED1
C2N
OUT
C2P4119
MAX1570
THIN QFN
4mm x 4mm
TOP VIEW
Pin Configuration
Ordering Information
LED1
LED2
LED3
LED4
LED5
4.7μF
PGNDGND
C1PC1NC2PC2N
1μF1μF
EN1
EN2
SET
RSET
1μF
2.7V TO 5.5V
ON/OFF
AND
DIMMING
1x/1.5x
REGULATING CHARGE PUMP
REFERENCE
AND
CONTROL
LOW-DROPOUT
CURRENT
REGULATORS
MAX1570
OUT
Typical Operating Circuit
19-2526; Rev 1; 4/05
PARTTEMP RANGEPIN-PACKAGE
MAX1570ETE-40°C to +85°C16 Thin QFN
MAX1570
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
ABSOLUTE MAXIMUM RATINGS
Stresses 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.
Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS
IN Operating Voltage2.75.5V
Undervoltage Lockout ThresholdVIN rising or falling2.252.452.60V
Undervoltage Lockout Hysteresis35mV
Supply Current1MHz switching, no load2.03.5mA
Shutdown Supply CurrentEN1 = EN2 = GND0.15µA
Soft-Start Done Time2.1ms
EN1 = GND, EN2 = IN, ISET = 33µA0.1900.2000.210
EN1 = IN, EN2 = GND, ISET = 67µA0.3800.4000.420SET Bias Voltage
EN1 = IN, EN2 = IN, ISET = 100µA0.5700.6000.630
SET Leakage in ShutdownEN1 = EN2 = GND, VIN = 5.5V, VSET = 0 or 5.5V0.011.00µA
SET Current Range20130µA
SET to LED_ Current RatioILED/ISET, ISET = 67µA, VLED_= 1V215230245A/A
LED_ to LED_ Current MatchingISET = 67µA, VLED_= 1V-30.3+3%
Maximum LED_ Sink CurrentISET = 130µA, VLED_= 1V2830mA
ISET = 33µA (Note 1)100180
ISET = 67µA (Note 2)200360LED_ Dropout Voltage
ISET = 100µA (Note 2)230410
EN1 = GND, EN2 = IN, ISET = 33µA185200215
EN1 = IN, EN2 = GND, ISET = 67µA277300323LED1 Regulation Voltage
(1.5x Mode)
EN1 = IN, EN2 = IN, ISET = 100µA360400440
LED Leakage in ShutdownEN1 = GND, EN2 = GND, VLED_= 5.5V0.011.00µA
Maximum OUT CurrentIN ≥ 3.4V, OUT ≥ 3.9V150mA
1x mode (VIN - VOUT)/IOUT1.001.75Open-Loop OUT Resistance1.5x mode (1.5VIN - VOUT)/IOUT8Ω
Switching Frequency1MHz
EN1, EN2 High VoltageIN = 2.7V to 5.5V1.6V
EN1, EN2 Low VoltageIN = 2.7V to 5.5V0.4V
EN1, EN2 Input CurrentEN_ = GND or 5.5V0.011.00µA
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.)
(Note 3)
PARAMETERCONDITIONSMINMAXUNITS
IN Operating Voltage2.75.5V
Undervoltage Lockout ThresholdVIN rising or falling2.252.60V
Supply Current1MHz switching, no load3.5mA
Shutdown Supply CurrentEN1 = EN2 = GND5µA
EN1 = GND, EN2 = IN, ISET = 33µA0.1900.210
EN1 = IN, EN2 = GND, ISET = 67µA0.3800.420SET Bias Voltage
EN1 = IN, EN2 = IN, ISET = 100µA0.5700.630
SET Leakage in ShutdownEN1 = EN2 = GND, VIN = 5.5V, VSET = 0 or 5.5V1µA
SET Current Range20130µA
SET to LED_ Current RatioILED/ISET, ISET = 67µA, VLED_= 1V215250A/A
LED_ to LED_ Current MatchingISET = 67µA, VLED_= 1V-3+3%
Maximum LED_ Sink CurrentISET = 130µA, VLED_= 1V28mA
ISET = 33µA (Note 1)180
ISET = 67µA (Note 2)360LED_ Dropout Voltage
ISET = 100µA (Note 2)410
EN1 = GND, EN2 = IN, ISET = 33µA185215
EN1 = IN, EN2 = GND, ISET = 67µA277323LED1 Regulation Voltage
(1.5x Mode)EN1 = IN, EN2 = IN, ISET = 100µA360440
LED Leakage in ShutdownEN1 = GND, EN2 = GND, VLED_= 5.5V1µA
Maximum OUT CurrentIN ≥ 3.4V, OUT ≥ 3.9V150mA
1x mode (VIN - VOUT)/IOUT1.75Open-Loop OUT Resistance1.5x mode (1.5VIN - VOUT)/IOUT8Ω
EN1, EN2 High VoltageIN = 2.7V to 5.5V1.6V
EN1, EN2 Low VoltageIN = 2.7V to 5.5V0.4V
EN1, EN2 Input CurrentEN_ = GND or 5.5V1µA
LED1 Dual Mode Threshold50100mV
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.)
PARAMETERCONDITIONSMINTYPMAXUNITS
LED1 Dual Mode™ Threshold5075100mV
Thermal-Shutdown Threshold160°C
Thermal-Shutdown Hysteresis20°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.)
LED EFFICIENCY vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc01
SUPPLY VOLTAGE (V)
EFFICIENCY P
LED
SUPPLY
(%)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN, EN2 = GND
SUPPLY POWER vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc02
SUPPLY VOLTAGE (V)
SUPPLY POWER (mW)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN,
EN2 = GND
SUPPLY CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs)
MAX1570 toc03
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN,
EN2 = GND
LED EFFICIENCY vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc04
SUPPLY VOLTAGE (V)
EFFICIENCY P
LED
SUPPLY
(%)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN, EN2 = GND
SUPPLY POWER (mW)
SUPPLY POWER vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc05
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN,
EN2 = GND
SUPPLY CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(5 LEDs)
MAX1570 toc06
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN,
EN2 = GND
EFFICIENCY vs. LED CURRENT
(4 LEDs, EN1 = PWM AT 1kHz)
MAX1570 toc07
LED CURRENT (mA)
EFFICIENCY P
LED
SUPPLY
(%)131112789106
VIN = 3.9V
VIN = 3V
LED CURRENT vs. PWM DIMMING
DUTY CYCLE INTO EN1 (5 LEDs)
MAX1570 toc08
PWM DUTY CYCLE (%)
LED CURRENT (mA)8060702030405010100
fPWM = 1kHz
VIN = 3.3V
SUPPLY CURRENT (mA)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 LEDs, LED1 OPEN FOR 1.5X ONLY MODE)
MAX1570 toc09
SUPPLY VOLTAGE (V)
15mA/LED,
EN1 = EN2 = VIN
5mA/LED, EN1 = GND,
EN2 = VIN
10mA/LED, EN1 = VIN,
EN2 = GND
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)
EN1 = EN2 = VIN
EN1 = GND, EN2 = VIN
EN1 = VIN, EN2 = GND
LED CURRENT (mA)3510-15
LED CURRENT vs. TEMPERATURE
(VIN = 3.3V, RSET = 7.5kΩ)
MAX1570 toc11
TEMPERATURE (°C)
EN1 = IN
EN2 = GND
LED CURRENT vs. RSET
MAX1570 toc12
RSET (kΩ)
LED CURRENT (mA)
EN1=IN,EN2=GND
EN1=
EN2=IN
EN1=GND,EN2=IN
Typical Operating Characteristics (continued)
(EN1 = EN2 = IN, CIN= 1µF, C1 = C2 = 1µF, COUT= 4.7µF, RSET= 9.09kΩ, TA= +25°C, unless otherwise noted.)
TYPICAL OPERATING WAVEFORM
IN 1X MODE
MAX1570 toc13
2μs/div
VIN
AC-COUPLED
1mV/div
IIN
AC-COUPLED
10mA/div
VOUT
AC-COUPLED
1mV/div
TYPICAL OPERATING WAVEFORM
IN 1.5X MODE (ILOAD = 90mA, VIN = 3.6V)
MAX1570 toc14
400ns/div
VIN
AC-COUPLED
20mV/div
IIN
AC-COUPLED
10mA/div
VOUT
AC-COUPLED
5mV/div
STARTUP RESPONSE (VIN = 3.3V)
(5 LEDs AT 15mA/LED)
MAX1570 toc15
400μs/div
IIN
50mA/div
VOUT
2V/div
DIMMING RESPONSE USING
PWM INTO EN1
MAX1570 toc16
100μs/div
ILED
15mA TO 5mA
5mA/div
VOUT
AC-COUPLED
500mV/div
EN1
0 TO 2V
2V/div
LINE-TRANSIENT RESPONSE
MAX1570 toc17
100μs/div
ILED
15mA
5mA/div
VOUT
AC-COUPLED
500mV/div
VIN
4 TO 3.6V
500mV/div

Partno	Mfg	Dc	Qty	Available	Descript
MAX1570ETE+ \|MAX1570ETE	MAXIM	N/a	264	avai	White LED Current Regulator with 1x/1.5x High-Efficiency Charge Pump