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MAX1573ETE+

P1-P3P4-P6P7-P9
General Description
The MAX1573 fractional charge pump drives up to four
white LEDs with regulated constant current for uniform
intensity. By utilizing proprietary adaptive 1x/1.5x
modes and ultra-low-dropout current regulators, it
maintains the highest possible efficiency over the full
1-cell Li+ battery input voltage range. The 1MHz fixed-
frequency switching allows for tiny external compo-
nents and 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 amongst three
levels of brightness. A pulse-width modulation (PWM)
signal can also be used to modulate LED brightness,
requiring no additional components.
The MAX1573 is available in the tiny chip-scale UCSP™
(4 x 4 grid) and 16-pin thin QFN packages.
Applications
Cell Phones, Smart Phones
PDAs, Digital Cameras, Camcorders
MP3 Players
Other Handhelds with Color Displays
Features
♦ Proprietary Adaptive 1x/1.5x Modes
♦ High Efficiency (P
LEDs
/P
BATT
), Up to 92%
♦ 0.2% LED Current Matching
♦ 28mA/LED Drive Capability
♦ Low Input Ripple and EMI
♦ Eliminates Ballast Resistors
♦ Logic or PWM Dimming Control
♦ Low 0.1µA Shutdown Current
♦ 2.7V to 5.5V Input Voltage Range
♦ Soft-Start Limits Inrush Current
♦ Output Overvoltage Protection
♦ Thermal Shutdown Protection
♦ No External Schottky Diode Required
♦ Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin
QFN (4mm x 4mm) Packages
MAX1573
White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
________________________________________________________________ Maxim Integrated Products 1
TOP VIEW
MAX1573
12
13
14
15
16
8
7
6
5
11 10 9
1234
N.C.
GND
LED3
LED4
LED1
LED2
SET
EN2
IN
C2N
C1P
C2P
OUT
EN1
N.C.
CIN
THIN QFN
4mm × 4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations
Ordering Information
MAX1573
V
IN
2.7V TO 5.5V
R
SET
ON/OFF
AND
DIMMING
CONTROL
SET
GND
C1N C1P C2N C2P
OUT
LED1
LED2
LED3
LED4
IN
EN1
1μF
1μF
1μF
1μF
V
OUT
UP TO 4 LEDS
EN2
Typical Operating Circuit
19-2847; Rev 2; 8/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART TEMP RANGE PIN-PACKAGE
MAX1573EBE-T -40°C to +85°C 14 UCSP (4 x 4)
MAX1573ETE -40°C to +85°C 16 Thin QFN
MAX1573ETE+ -40°C to +85°C 16 Thin QFN
UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of data sheet.
+ Denotes lead-free package.
MAX1573
White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
EN1
= V
EN2
= 3.6V, C
IN
= C1 = C2 = C
OUT
= 1µF, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise
noted.) (Note 1)
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 +6.0V
SET, LED1, LED2, LED3, LED4 to GND ......-0.3V to (V
IN
+ 0.3V)
C1N, C2N to GND ..........................................-0.3V to (V
IN
+ 1V)
C1P, C2P to GND ............................................-0.3V to greater of
.............................................................(V
OUT
+ 1V) or (V
IN
+ 1V)
OUT Short Circuit to GND ..........................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
14-Bump UCSP (derate 7.36mW/°C above +70°C) ....589mW
16-Pin Thin QFN (derate 16.9mW/°C above +70°C) .1349mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
IN Operating Voltage
2.7 5.5
V
Undervoltage Lockout Threshold V
IN
rising or falling, 35mV hysteresis
2.25 2.45 2.60
V
Supply Current Switching, no load, I
SET
= 130µA 2 4
mA
Shutdown Supply Current EN1 = EN2 = OUT = GND, T
A
= +25°C
0.1
10 µA
Soft-Start Completion Time
2.1
ms
SET Bias Voltage
0.570 0.6 0.630
V
SET Leakage in Shutdown EN1 = EN2 = GND, T
A
= +25°C
0.01
1µA
SET Current Range 40
130
µA
EN1 = EN2 = IN
190 219 245
EN1 = IN, EN2 = GND
58 66 74SET to LED_ Current Ratio (I
LED
/I
SET
)I
SET
= 60µA
EN1 = GND, EN2 = IN 19.5
22
25.0
A/A
LED_ Current Accuracy
E N 1 = EN 2 = IN , R
S E T
= 4.64kΩ , T
A
= 0°C to + 85°C ±0.6
%
LED_ Current Matching I
SET
= 130µA, T
A
= 0°C to +85°C (Note 2)
±0.2
%
Maximum LED_ Sink Current I
SET
= 130µA, EN1 = EN2 = IN
25.9
28
mA
LED_ Dropout Voltage I
SET
= 87µA (Note 3) 40 80
mV
LED_ Minimum Regulation Voltage (1.5x Mode)
EN1 = EN2 = IN, I
SET
= 87µA
100 150 200
mV
LED Leakage in Shutdown EN1 = EN2 = GND, V
LED
= 5.5V, T
A
= +25°C
0.01
1µA
Maximum OUT Current V
IN
≥ 3.4V, V
OUT
≥ 3.9V, EN1 = EN2 = IN
120
mA
1x mode (1 x V
IN
- V
OUT
) / I
OUT
1.5
Open-Loop OUT Resistance
1.5x mode (1.5 x V
IN
- V
OUT
) / I
OUT
10
Ω
Switching Frequency 1
MHz
EN1, EN2 Logic High Voltage V
IN
= 2.7V to 5.5V
1.6
V
EN1, EN2 Logic Low Voltage V
IN
= 2.7V to 5.5V
0.4
V
EN1, EN2 Input Current V
EN
_ = GND or 5.5V, T
A
= +25°C
0.01
1µA
Thermal-Shutdown Threshold 20°C hysteresis
160
°C
Note 1: Specifications to -40°C are guaranteed by design and not production tested.
Note 2: LED_ current matching is defined as: (I
LED
- I
AVG
) / I
AVG
.
Note 3: Dropout voltage is defined as the LED_ to GND voltage at which the LED_ current drops 10% from the value at V
LED
= 200mV.
MAX1573
White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
_______________________________________________________________________________________ 3
50
60
70
80
90
100
4.2 3.8 3.73.9 3.6 3.5 3.4 3.0
EFFICIENCY (P
LEDs
/P
BATT
)
vs. Li+ BATTERY DISCHARGE
MAX1573 toc01
Li+ BATTERY VOLTAGE, TIME-WEIGHTED (V)
EFFICIENCY (%)
FULL
3/10
1/10
0
2
1
5
4
3
8
7
6
9
3.0 3.43.2 3.6 3.8 4.0 4.2
INPUT RIPPLE vs. SUPPLY VOLTAGE
MAX1573 toc04
SUPPLY VOLTAGE (V)
INPUT RIPPLE (mV
RMS
)
FULL
3/10
1/10
0
15
10
5
20
25
30
5986 7 10 11 12 13 14 15
LED CURRENT vs. R
SET
MAX1573 toc07
R
SET
(kΩ)
LED CURRENT (mA)
FULL
1/10
3/10
Typical Operating Characteristics
(V
IN
= 3.6V, EN1 = EN2 = IN, C
IN
= C1 = C2 = C
OUT
= 1µF, R
SET
= 7.50kΩ, T
A
= +25°C, unless otherwise noted.)
500ns/div
20mV/
div
10mA/
div
20mV/
div
V
IN
I
IN
V
OUT
TYPICAL OPERATING WAVEFORMS
IN 1x MODE
MAX1573 toc08
3.6V Li+ BATTERY INPUT
500ns/div
20mV/
div
10mA/
div
20mV/
div
V
IN
I
IN
V
OUT
TYPICAL OPERATING WAVEFORMS
IN 1.5x MODE
MAX1573 toc09
3.4V Li+ BATTERY INPUT
P1-P3P4-P6P7-P9

MAX1573ETE+

Mfr. #:
Buy MAX1573ETE+
Manufacturer:
Maxim Integrated
Description:
LED Lighting Drivers White LED 1x/1.5x Charge Pump
Lifecycle:
New from this manufacturer.
Delivery:
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