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1x/1.5x/2x White LED Charge Pump with Two
LDOs in 4mm x 4mm Thin QFN
Pin Description
PIN
1
2
3
4
5
6
7
8
9–12
13–16
17
18
19
20
21
22
NAME
PIN
IN
GND
LDO1
LDO2
REFBP
SETF
SETM
F4–F1
M4–M1
P2
ENLDO
ENM2
ENM1
ENF
C1N
FUNCTION
Supply Voltage Input. Bypass to PGND with a 10μF ceramic capacitor. The input voltage range is
2.7V to 5.5V. PIN is high impedance during shutdown.
Chip Supply Voltage Input. Bypass to GND with a 10μF ceramic capacitor as close to the IC as
possible. The input voltage range is 2.7V to 5.5V. IN is high impedance during shutdown.
Ground. Connect GND to system ground and the input bypass capacitor as close to the IC as
possible.
LDO1 Output. Bypass with a 1μF ceramic capacitor to GND. LDO1 is pulled to ground through an
internal 400k Ω during shutdown.
LDO2 Output. Bypass with a 1μF ceramic capacitor to GND. LDO2 is pulled to ground through an
internal 400k Ω during shutdown.
Reference Filter. Bypass REFBP with a 0.01μF ceramic capacitor to GND.
Bias Current Set Input for F1–F4. The current flowing out of SETF sets the maximum (100%) bias
current into each LED. V SETF is internally biased to 0.6V. Connect a resistor (R SETF ) from SETF to
GND to set the flash current. R SETF = 414 / I LED(MAX) . SETF is high impedance during shutdown.
Bias Current Set Input for M1–M4. The current flowing out of SETM sets the maximum (100%) bias
current into each LED. V SETM is internally biased to 0.6V. Connect a resistor (R SETM ) from SETM to GND
to set the main LED current. R SETM = 138 / I LED(MAX) . SETM is high impedance during shutdown.
400mA Combined Current Flash LED Cathode Connection and Charge-Pump Feedback. Current flowing
into F_ is based on I SETF . The charge pump regulates the lowest F_ voltage to 0.15V. Grounding any F_
input forces OUT to operate at approximately 5V. Connect F_ to OUT if this LED is not populated.
30mA Main LED Cathode Connection and Charge-Pump Feedback. Current flowing into M_ is based on the
EN_ configuration and I SETM . The charge pump regulates the lowest M_ input voltage to 0.15V. Grounding
any M_ forces OUT to operate at approximately 5V. Connect M_ to OUT if this LED is not populated.
Default Output-Voltage Select Input. P1 and P2 set the LDO1 and LDO2 voltages to one of nine
combinations (Table 2). P2 is high impedance in an off condition and shortly after an on condition.
LDO Output Enable. Drive to a logic-level high to turn on both LDOs. Drive to a logic-level low to turn
off both LDOs.
Enable and Dimming Control for M1–M4. Drive both ENM1 and ENM2 to a logic-level high to turn on
the main LEDs. Drive both ENM1 and ENM2 to a logic-level low to turn off the main LEDs. The
dimming technique is discussed in the Applications Information section.
Enable and Dimming Control for M1–M4. Drive both ENM1 and ENM2 to a logic-level high to turn on
the main LEDs. Drive both ENM1 and ENM2 to a logic-level low to turn off the main LEDs. The
dimming technique is discussed in the Applications Information section.
Enable and Dimming Control for F1–F4. Drive ENF to a logic-level high to turn on the flash LEDs.
Drive ENF to a logic-level low to turn off the flash LEDs. The dimming technique is discussed in the
Applications Information section.
Transfer Capacitor 1 Negative Connection. Connect a 1μF ceramic capacitor between C1P and C1N.
C1N is internally shorted to IN during shutdown.
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