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480mA White LED 1x/1.5x/2x Charge Pump for
Backlighting and Camera Flash
Typical Operating Characteristics (continued)
(V IN = 3.6V, EN_ = IN, Circuit of Figure 1, R SETM = 9.09k Ω , R SETF = 4.12k Ω , T A = +25°C, unless otherwise noted.)
V EN1M ,
V EN2M
SINGLE-WIRE DIMMING RESPONSE
MAX1576 toc16
5V/div
LINE-TRANSIENT RESPONSE
MAX1576 toc17
V IN
1V/div
3V
I OUT
V OUT
50mA/div
2V/div
V OUT
I OUT
1V/div
AC-COUPLED
50mA/div
0
2ms/div
40 μ s/div
Pin Description
PIN
1
2
3
4
5
6
7
9
10
8
14
11
12
13
15
16
17
NAME
OUT
ENM1
ENM2
ENF1
ENF2
LED8
LED7
LED6
LED5
GND2
GND1
LED4
LED3
LED2
LED1
SETM
SETF
FUNCTION
Output. Bypass to ground with a 4.7μF ceramic capacitor. Connect to the anodes of all the LEDs. OUT is
internally pulled to ground through a 5k Ω resistor during shutdown.
Enable and Brightness Control for LED1–LED4 (Backlight). See Table 1 and Figure 3.
Enable and Brightness Control for LED5–LED8 (Flash). See Table 2 and Figure 3.
Flash LED_ Cathode Connection and Charge-Pump Feedback. Current flowing into LED_ is based on the
ENF_ logic levels and R SETF . The charge pump regulates the lowest LED_ voltage to 0.15V. Grounding any
LED_ forces OUT to operate at approximately 5V. Connect LED_ to IN if this LED is not populated.
Ground. Connect GND_ to system ground and the ground side of the input bypass capacitor as close to the
IC as possible.
Main LED_ Cathode Connection and Charge-Pump Feedback. Current flowing into LED_ is based on the
ENM_ logic levels and R SETM . The charge-pump regulates the lowest LED_ voltage to 0.15V. Grounding any
LED_ forces OUT to operate at approximately 5V. Connect LED_ to IN if this LED is not populated.
Bias Current Set Input for LED1–LED4. The current flowing out of SETM sets the maximum (100%) bias
current into each LED. SETM is internally biased to 0.604V. Connect a resistor (R SETM ) from SETM to ground
to set the main LED current, R SETM = (233 x 0.604) / I LED(MAX) . SETM is high impedance during shutdown.
Bias Current Set Input for LED5–LED8. The current flowing out of SETF sets the maximum (100%) bias
current into each LED. SETF is internally biased to 0.604V. Connect a resistor (R SETF ) from SETF to ground
to set the flash LED current, R SETF = (708 x 0.604) / I LED(MAX) . SETF is high impedance during shutdown.
6
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