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MAX1574 Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # MAX1574
Description  180mA, 1x/2x, White LED Charge Pump in 3mm x 3mm TDFN
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX1574 Datasheet(HTML) 5 Page - Maxim Integrated Products

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180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
_______________________________________________________________________________________
5
Typical Operating Characteristics (continued)
(Circuit of Figure 2, VIN = 3.6V, EN = IN, driving three white LEDs, TA = +25°C, unless otherwise noted.)
DIMMING RESPONSE
MAX1574 toc10
IOUT
VEN
VOUT
50mA/div
2V/div
2V/div
10ms/div
LINE TRANSIENT 3.8V TO 3.3V TO 3.8V
MAX1574 toc11
VOUT
VIN
IOUT
1V/div
1V/div
60mA,
20mA/div
100µs/div
Pin Description
PIN
NAME
FUNCTION
1IN
Supply Voltage Input. Connect a 0.47µF to 1µF ceramic capacitor from IN to GND. The input voltage
range is 2.7V to 5.5V. IN is high impedance during shutdown.
2EN
Enable and Dimming Control. Pulsing EN low dims the LEDs in multiple steps. Drive low for longer than
2ms (typ) to shut down the IC. From shutdown, drive EN high (50µs min) to set ILED to the maximum
current (see the SETfunction). Pulse EN low for 0.5µs to 500µs to dim the LEDs (Figure 1).
3CPTransfer-Capacitor Positive Connection. Connect a 0.22µF capacitor from CP to CN.
4CNTransfer-Capacitor Negative Connection. Connect a 0.22µF capacitor from CP to CN.
5
SET
Current-Set Input. Connect a resistor (RSET) from SET to GND to set the maximum LED current.
ILED(MAX) = 393 × 0.6V / RSET. SET is internally biased to 0.6V. SET is high impedance during shutdown.
6
LED3
7
LED2
8
LED1
LED_ Cathode Connection. Current flowing into LED_ is based on SET description above. In 2x mode,
the charge pump regulates the lowest LED_ voltage to 0.18V. Connect LED_ to IN for unpopulated LEDs.
LED_ is high impedance during shutdown.
9
GND
Ground. Connect GND to system ground and as close as possible to the input-bypass capacitor ground.
10
OUT
Output. Connect a 0.47µF to 1µF ceramic capacitor from OUT to GND, and connect OUT to the anodes
of all the LEDs. OUT is pulled to ground through an internal 5k
Ω resistor in shutdown.
—EP
Exposed Paddle. Connect the exposed paddle directly to GND underneath the IC.


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