1x/1.5x/2x White LED Charge Pump with Two
LDOs in 4mm x 4mm Thin QFN
C3
1 μ F
C4
1 μ F
INPUT
2.7V TO 5.5V
PIN
C1P
C1N
C2P
C2N
LOW-
LDO1
C1
10 μ F
IN
GND
1x/1.5x/2x REGULATING
CHARGE PUMP
DROPOUT
LINEAR
REGULATORS
LDO2
C7
C6
1 μ F
1 μ F
PGND
ERROR
AMP 1
OUT
OUTPUT
UP TO 480mA
C5
C8
REFBP
OVD
1.25V
10 μ F
0.01 μ F
ENM1
ENM2
CONTROL AND
REFERENCE
0.15V
SELMIN
ENF
ENLDO
FLASH CONTROL
MAIN CONTROL
M1
D1
P1
P2
IN
0.6V
M2
M3
M4
D2
D3
D4
SETM
ERROR
AMP 2
+
+
GND
+
+
F1
D5
R SETM
6.81k Ω
IN
F2
F3
F4
D6
D7
D8
+
+
+
+
ERROR
AMP 3
MAX8631X
MAX8631Y
SETF
R SETF
4.12k Ω
Figure 1. Functional Diagram and Application Circuit
GND
8
_______________________________________________________________________________________
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