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White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
ABSOLUTE MAXIMUM RATINGS
IN1, IN2, IN3, V DD to AGND..................................-0.3V to +6.0V
SCL, SDA to AGND ....................................-0.3V to (V DD + 0.3V)
IN1, IN2, IN3 to NEG .............................................-0.3V to +6.0V
AGND to C2N ........................................................-0.3V to +6.0V
C1P, C2P to AGND ....................................-0.3V to (V IN1 + 0.3V)
LED_, C1N, C2N to NEG............................-0.3V to (V IN1 + 0.3V)
LDO1, LDO2, REF to AGND ......................-0.3V to (V IN3 + 0.3V)
CMREF, AIN+, AIN-, SPK+, SPK-
to AGND..................................................-0.3V to (V IN2 + 0.3V)
IN1, IN2 to IN3.......................................................-0.3V to +0.3V
PGND1, PGND2 to AGND.....................................-0.3V to +0.3V
SPK+, SPK- Short Circuit to PGND2 or IN2 ...............Continuous
Continuous Power Dissipation (T A = +70°C)
28-Pin, Thin QFN 4mm x 4mm
(derate 28.6mW/°C above +70°C) ............................2286mW
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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.
ELECTRICAL CHARACTERISTICS
(V IN1 = V IN2 = V IN3 = V DD = 3.6V, V AGND = V PGND1 = V PGND2 = 0V, circuit of Figure 2, T A = -40°C to +85°C, unless otherwise noted.
Typical values are at T A = +25°C.) (Note 1)
PARAMETER
V IN1 , V IN2 , V IN3 Operating
Voltage
V DD Operating Range
Undervoltage Lockout (UVLO)
Threshold
V IN3 rising
CONDITIONS
MIN
2.7
1.5
2.25
TYP
2.45
MAX
5.5
5.5
2.65
UNITS
V
V
V
UVLO Hysteresis
100
mV
V DD Shutdown Threshold
0.450
0.865
1.350
V
IN1, IN2, IN3 Shutdown Supply
Current
(All Outputs Off)
V DD = AGND
V DD = 3.6V
T A = +25°C
T A = +85°C
T A = +25°C
T A = +85°C
0.1
0.1
2
2
1
10
μA
No-Load Supply Current
Charge pump inactive, 2 LEDs at 0.1mA setting, audio
amplifier disabled, LDO1 and LDO2 disabled
LED driver disabled, audio amplifier disabled, and LDO1
and LDO2 enabled
Charge pump active, 1MHz switching, all LEDs at
25.6mA setting, audio amplifier disabled, LDO1 and
LDO2 disabled
70
170
1.50
120
250
4.00
μA
mA
Thermal Shutdown
Thermal-Shutdown Hysteresis
CHARGE PUMP
LED driver disabled, audio amplifier enabled, LDO1 and
LDO2 disabled
SYNC = 0
6.6
+160
20
1000
20
°C
°C
SYNC = 1, SW_MODE = 00
450
550
650
Switching Frequency
(f SW )
SYNC = 1, SW_MODE = 01
575
700
825
kHz
SYNC = 1, SW_MODE = 10
625
± 25
2
_______________________________________________________________________________________
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