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MAX8821ETI+
White LED Charge Pump with Mono Class D Audio Amp and Dual LDO
General DescriptionThe MAX8821 integrates a charge pump for white
LEDs, an audio loudspeaker amplifier, and two low-
noise LDOs controlled by an I2C control interface. The
high-efficiency, adaptive-mode inverting charge pump
drives up to six LEDs with constant current for uniform
brightness. The LED current is controlled by an I2C
interface and adjusts from 0.1mA to 25.6mA per LED
into 32 pseudo-logarithmic steps. Independent volt-
ages for each LED maximize efficiency even with large
LED forward voltage (VF) mismatch. An internal temper-
ature derating function reduces the current above
+40°C to protect the LEDs.
The high-efficiency mono Class D audio amplifier deliv-
ers up to 2W into a 4Ωspeaker from a 5V input supply.
The amplifier features proprietary filterless Active
Emissions Limiting (AEL) technology. AEL prevents
high-frequency emissions resulting from conventional
Class D free-wheeling behavior in the presence of an
inductive load. The amplifier offers two modulation
schemes: a fixed-frequency mode (FFM) and a spread-
spectrum mode (SSM) that reduce EMI-radiated emis-
sions due to the modulation frequency. The amplifier
also has robust output protection and high power-sup-
ply rejection ratio (PSRR). Click-and-pop suppression is
active during power-up/down, enable/disable, and for
all mode changes. The amplifier’s gain is adjustable
through an I2C interface, from -3dB to +24dB in 10 3dB
steps. Differential inputs improve common-mode noise
rejection.
The LDOs in the MAX8821 are designed for low-noise
operation. Each LDO output voltage can be individually
programmed by the I2C interface. Both LDO1 and
LDO2 have a high 70dB PSRR rating.
The MAX8821 includes soft-start, thermal shutdown,
open-circuit, and short-circuit protections, and is avail-
able in a compact 28-pin, Thin QFN, 4mm x 4mm pack-
age (0.8mm max height).
ApplicationsCell Phones and Smartphones
PDAs, Digital Cameras, Camcorders
MP3 Players, GPS Devices
FeaturesWhite LED Inverting Charge Pump
Independent Adaptive Current Regulators for
Each LED
6 Low-Dropout Current Regulators
Flexible I2C Dimming Control for Each LED
Ramp-Up/Down, Current Control for Each LED
Low 70µA (typ) Quiescent CurrentDerating Function Protects LEDsMono 2W Class D Loudspeaker Amplifier
85% Efficiency (RL= 8Ω, POUT= 600mW)
Low 0.05% THD+N at 1kHz
High 65dB PSRR at 1kHz
Fully Differential Inputs
-3dB to +24dB Gain Settings in 3dB Steps
Integrated Click-and-Pop Suppression
Low Quiescent CurrentDual Low-Noise LDO
45µVRMSOutput Noise, 70dB PSRR
Flexible I2C-Controlled Output Voltages
200mA and 300mA Output Current Drive
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO19-1014; Rev 0; 10/07
EVALUATION KIT
AVAILABLE
Ordering InformationNEG
LED1
LED5
LED4
LED3
LED2
LED6
DUAL LOW
NOISE LDO
LOUDSPEAKER/
EARPIECE
SPK+
SPK-
INDIVIDUAL
0.1mA TO
25.6mA
DIMMING
PGND1
IN1
CMREF
IN3
REF
AGND
IN2
PGND2
AIN+
AIN-
VDD
SDA
SCL
DIFFERENTIAL
AUDIO INPUT
LOGIC
CONTROL AND I2C
INTERFACE
C1PC1NC2PC2N
LDO1
LDO2
INPUT
2.7 TO 5.5V
MAX8821
Typical Operating Circuit
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODEMAX8821ETI+-40°C to +85°C28 Thin QFN
4mm x 4mmT2844-1
+Denotes a lead-free package.
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
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.
IN1, IN2, IN3, VDDto AGND..................................-0.3V to +6.0V
SCL, SDA to AGND....................................-0.3V to (VDD+ 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 (VIN1+ 0.3V)
LED_, C1N, C2N to NEG............................-0.3V to (VIN1+ 0.3V)
LDO1, LDO2, REF to AGND......................-0.3V to (VIN3+ 0.3V)
CMREF, AIN+, AIN-, SPK+, SPK-
to AGND..................................................-0.3V to (VIN2+ 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 (TA= +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
PARAMETERCONDITIONSMINTYPMAXUNITSVIN1, VIN2, VIN3 Operating
Voltage2.75.5V
VDD Operating Range1.55.5V
Undervoltage Lockout (UVLO)
ThresholdVIN3 rising2.252.452.65V
UVLO Hysteresis100mV
VDD Shutdown Threshold0.4500.8651.350V
TA = +25°C0.11VDD = AGNDTA = +85°C0.1
TA = +25°C210
IN1, IN2, IN3 Shutdown Supply
Current
(All Outputs Off)VDD = 3.6VTA = +85°C2
Charge pump inactive, 2 LEDs at 0.1mA setting, audio
amplifier disabled, LDO1 and LDO2 disabled70120
LED driver disabled, audio amplifier disabled, and LDO1
and LDO2 enabled170250
Charge pump active, 1MHz switching, all LEDs at
25.6mA setting, audio amplifier disabled, LDO1 and
LDO2 disabled
No-Load Supply Current
LED driver disabled, audio amplifier enabled, LDO1 and
LDO2 disabled6.620
Thermal Shutdown+160°C
Thermal-Shutdown Hysteresis20°C
CHARGE PUMPSYNC = 01000
SYNC = 1, SW_MODE = 00450550650
SYNC = 1, SW_MODE = 01575700825Switching Frequency
(fSW)
SYNC = 1, SW_MODE = 10625
± 25
kHz
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
PARAMETERCONDITIONSMINTYPMAXUNITSSoft-Start Time0.1ms
Regulation Voltage(VIN1 - VNEG)5V
Open-Loop NEG Output
Resistance(0.5 x VIN1 - VNEG) / INEG1.753.5Ω
Output CurrentVIN1 = 3.2V, LED VFMAX = 3.9V154mA
NEG Discharge Resistance in
ShutdownAll LEDs disabled10kΩ
LED_ CURRENT REGULATORSCurrent Setting RangeILED_0.125.6mA
TA = +25°C-2±1+2
25.6mA settingTA = -40°C to derating
function start temperature
(enabled by I2C)+5Current Accuracy
0.1mA setting, TA = +25°C-30±5+30
Current-Derating-Function Start
Temperature+40°C
Current-Derating-Function SlopeTA = +40°C to +85°C-1.67%/°C
Charge pump inactive2.34.6RDS ONCharge pump active514Ω
Charge pump inactive72120Dropout Voltage25.6mA setting (Note 2)Charge pump active120360mV
Current Regulator
Switchover Threshold
Charge pump inactive to active,
VLED_ falling125150175mV
Current Regulator
Switchover Hysteresis100mV
TA = +25°C0.011Leakage Current in ShutdownAll LEDs
disabledTA = +85°C0.1µA52410482097Off Blink Time
B7, B6 or B3, B2,
SYNC = 0,
Table 11419466131262On Blink Time
B5, B4 or B1, B0,
SYNC = 0,
Table 115242625241048Ramp-Up/Down Time
LED__RU: B7, B6 or B3, B2
LED__RD: B5, B4 or B1, B0
SYNC = 0,
Tables 8, 9, 10 (Note 3)112097
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
PARAMETERCONDITIONSMINTYPMAXUNITS
AUDIO AMPLIFIERCommon-Mode Bias Voltage0.95 x
(VIN3 / 2)VIN3 / 21.05 x
(VIN3 / 2)V
Output Offset VoltageVAIN+ = VAIN- = VIN3 / 2, audio gain = 0dB±1mV
Common-Mode Input Voltage0.5VIN3 -
1.2VV
Audio GainTable 15, B3:B0
Audio Gain Accuracy-3+3%
Audio gain = -3dB54.499.0143.5
Audio gain = 0dB49.189.2129.3
Audio gain = 3dB43.178.4113.7
Audio gain = 6dB36.866.997.0
Audio gain = 9dB30.555.580.5
Audio gain = 12dB24.644.764.8
Audio gain = 15dB19.335.251.0
Audio gain = 18dB14.826.939.0
Audio gain = 21dB11.120.229.3
Input Resistance
Audio gain = 24dB8.215.022.0
VIN2 = VIN3 = 3.6V46Common-Mode Rejection Ratiof = 1kHz, VIN2 = VIN3 = 3.6V46dB
f = 217Hz65Power-Supply Rejection RatioVAIN+ = VAIN- = VIN3 / 2,
100mVP-P at VIN3f = 20kHz50dB
RL = 8Ω0.360.5VIN3 = 3.6VRL = 4Ω0.85
RL = 8Ω0.81.1Output Power
THD+N = 1%,
f = 1kHz
(Note 4)VIN3 = 5VRL = 4Ω2.0
Total Harmonic Distortion Plus
Noise
RL = 8Ω, f = 1kHz, POUT = 0.25W,
VIN2 = VIN3 = 3.6V0.05%
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
MAX8821
PARAMETERCONDITIONSMINTYPMAXUNITSFixed-frequency mode (FFM)91
Spread-spectrum mode (SSM)89
FFM A weighted93Signal-to-Noise Ratio
RL = 8Ω, f = 1kHz,
POUT = 0.25W,
VIN2 = VIN3 = 3.6V
SSM A weighted91
SW_MODE = 0090011001300
SW_MODE = 01115014001650Oscillator Frequency
(fOSC)SW_MODE = 101250
±50
kHz
Differential Input
ResistanceShutdown mode only100kΩ
Output Current LimitSPK+, SPK- short circuited to PGND2 or to IN22A
Wake-Up Delay After
Short Circuit110µs
LDO1Output Voltage VLDO13.6V ≤ VIN3 ≤ 5.5V,
1mA ≤ ILDO1 ≤ 300mA1.1641.2001.236V
Maximum Output
Current300mA
Output Current LimitVLDO1 = 0V4006501000mA
Dropout VoltageILDO1 = 200mA, TA = +25°C (Note 5)150300mV
Line RegulationVIN3 stepped from 3.4V to 5.5V,
ILDO1 = 150mA2.4mV
Load RegulationILDO1 stepped from 1mA to 300mA25mV
Power-Supply
Rejection
ΔVIN3/ΔVLDO1
10Hz to 10kHz,
ILDO1 = 30mA70dB
Output Voltage Noise
(RMS)
100Hz to 100kHz,
ILDO1 = 30mA45µVRMS
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
PARAMETERCONDITIONSMINTYPMAXUNITSProgrammable Output
Voltage
ILDO1 = 50mA
control bits B3:B0;
see Table 13
Shutdown Output
ImpedanceLDO1 disabled through I2C1kΩ
LDO2Output Voltage VLDO23.6V ≤ VIN3 ≤ 5.5V,
1mA ≤ ILDO2 ≤ 200mA1.4551.5001.545V
Maximum Output
Current200mA
Output Current LimitVLDO2 = 0V250550750mA
Dropout VoltageILDO2 = 133mA, TA = +25°C (Note 5)100200mV
Line RegulationVIN3 stepped from 3.4V to 5.5V, ILDO2 = 100mA2.4mV
Load RegulationILDO2 stepped from 1mA to 200mA25mV
Power-Supply
Rejection
ΔVIN3/ΔVLDO2
10Hz to10kHz,
ILDO2 = 20mA70dB
Output Voltage Noise
(RMS)
100Hz to100kHz,
ILDO2 = 20mA45µVRMS
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
PARAMETERCONDITIONSMINTYPMAXUNITSProgrammable Output
Voltage
ILDO2 = 50mA
control bits
B3:B0;
see Table 14
Shutdown Output
ImpedanceLDO2 disabled through I2C1kΩ
I2C INTERFACE (Figure 8)Logic Input High
Voltage
0.7 x
VDDV
Logic Input Low
Voltage
0.3 x
VDDV
TA = +25°C-10.01+1Logic Input CurrentVIL = 0V or VIH = VDDTA = +85°C0.1µA
SDA Output Low
VoltageISDA = 3mA0.030.4V
I2C Clock Frequency400kHz
Bus-Free Time
Between START and
STOP
tBUF1.3µs
Hold Time Repeated
START ConditiontHD_STA0.60.1µs
SCL Low PeriodtLOW1.30.2µs
SCL High PeriodtHIGH0.60.2µs
Setup Time Repeated
START ConditiontSU_STA0.60.1µs
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
PARAMETERCONDITIONSMINTYPMAXUNITSSDA Hold TimetHD_DAT0-0.01µs
SDA Setup TimetSU_DAT10050ns
Setup Time for STOP
ConditiontSU_STO0.60.1µs
ELECTRICAL CHARACTERISTICS (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= -40°C to +85°C, unless otherwise noted.
Typical values are at TA= +25°C.) (Note 1)
Note 1:Limits are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:Dropout voltage is defined as the LED_ to GND voltage when the current into LED_ drops 10% from the value at VLED_= 0.5V.
Note 3:Ramp-up time is from 0mA to full scale; ramp-down time is from full scale to 0mA.
Note 4:Output power is specified by a combination of a functional output current test and characterization analysis.
Note 5:The dropout voltage is defined as VIN_- VOUTwhen VOUTis 100mV below the nominal value of VOUT. The specification only
applies when VOUT≥3.0V.
LED CHARGE PUMPEFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX LEDS)
MAX8821 toc01
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
1.6mA/LED
6.4mA/LED
20.8mA/LED
16mA/LED
LEDs HAVE MATCHED VF
EFFICIENCY vs. SUPPLY VOLTAGE
(DRIVING SIX LEDS)
MAX8821 toc02
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
1.6mA/LED
6.4mA/LED
20.8mA/LED
16mA/LED
LEDs HAVE MISMATCHED VF
20.8mA/LED
EFFICIENCY vs. Li+ BATTERY VOLTAGE
DRIVING SIX LEDs
MAX8821 toc03
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY P
LED
BATT
(%)
20.8mA/LED
16mA/LED
6.4mA/LED
1.6mA/LED
20.8mA/LEDLEDs HAVE HIGH MATCHED VF
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (DRIVING SIX LEDs)
MAX8821 toc04
SUPPLY CURRENT (mA)
ILED = 20.8mA
ILED = 16mA
ILED = 6.4mA
ILED = 1.6mA
LEDs HAVE HIGH MISMATCHED VF
SUPPLY CURRENT
vs. SUPPLY VOLTAGE (RGB MODULE)MAX8821 toc05
SUPPLY CURRENT (mA)
ILED = 20.8mA
ILED = 16mA
ILED = 6.4mA
ILED = 1.6mA
RGB MODULE: LUMEX SML-LX3632SISUGSBC
LED CURRENT MATCHING
vs. SUPPLY VOLTAGE (16mA/LED)MAX8821 toc06
LED CURRENT (mA)
CHARGE PUMP IN 1.5x
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
LED CURRENT vs.AMBIENT
TEMPERATUREMAX8821 toc07
TEMPERATURE (°C)
LED CURRENT (mA)6040200-20
CURRENT DERATING ENABLED
400ns/div
1x MODE OPERATING
WAVEFORMS (VIN = 4V)VIN
VNEG
200mA/div
AC-COUPLED
100mV/div
MAX8821 toc08
IIN
ILED
ALL LEDs ON, ILED = 25.6mA
2V/div
20mA/div
400ns/div
1.5x MODE OPERATING
WAVEFORMS (VIN = 3V)VIN
VNEG
200mA/div
AC-COUPLED
100mV/div
MAX8821 toc09
IIN
ILED
ALL LEDs ON, ILED = 25.6mA
2V/div
20mA/div
1ms/div
LED LINE TRANSIENT WITH MODE CHANGE
(VIN = 3.8V TO 3.4V TO 3.8V)VIN
200mA/div
3.8V
MAX8821 toc10
IIN
ILED6
ALL LEDs AT 25.6mA SETTING
20mA/div
3.4V
1ms/div
LED LINE TRANSIENT WITH MODE CHANGE
(VIN = 4.2V TO 3.8V TO 4.2V)VIN
200mA/div
4.2V
MAX8821 toc11
IIN
ILED6
ALL LEDs AT 25.6mA SETTING
20mA/div
3.8V
1ms/div
LED STARTUP WAVEFORMS
(VIN = 4V)VIN
50mA/div
AC-COUPLED
50mV/div
MAX8821 toc12
IIN
ILED6
20mA/div
1ms/div
LED SHUTDOWN WAVEFORMS
(VIN = 4V)VIN
50mA/div
AC-COUPLED
MAX8821 toc13
IIN
ILED6
20mA/div
50mV/div
400ms/div
LED RAMP-UP10mA/div
MAX8821 toc14
ILED6
ILED5
10mA/div
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
FIXED-FREQUENCY-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX8821 toc19
FREQUENCY (kHz)
AMPLITUDE (dBV)
RL = 8Ω
VBATT = 5V
VOUT = -60dBV
UNWEIGHTED
FFM -1100kHz
SPREAD-SPECTRUM-MODE OUTPUT
SPECTRUM vs. FREQUENCY
MAX8821 toc18
FREQUENCY (kHz)
AMPLITUDE (dBV)
RL = 8Ω
VBATT = 5V
VOUT = -60dBV
UNWEIGHTED
AUDIO AMPLIFIER PHASE
vs. FREQUENCYMAX8821 toc21
PHASE (1
TOTAL HARMONIC DISTORTION
PLUS NOISE vs. FREQUENCY
MAX8821 toc15
FREQUENCY (kHz)
THD+N (%)10.1
POUT = 25mW
POUT = 350mW
POUT = 100mW
VIN = 3.6V
RL = 8Ω
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWERMAX8821 toc16
OUTPUT POWER (W)
THD+N (%)
VIN = 3.6V
RL = 8Ω
TOTAL HARMONIC DISTORTION
vs. OUTPUT POWERMAX8821 toc17
OUTPUT POWER (W)
THD+N (%)
VIN = 5V
RL = 4Ω
AUDIO AMPLIFIER GAIN
vs. FREQUENCY
MAX8821 toc20
FREQUENCY (kHz)
GAIN (dB)
AUDIO AMPLIFIER PSRR
vs. FREQUENCYMAX8821 toc22
PSRR (dB)
VRIPPLE = 100mVP-P
AUDIO GAIN = 0dB
RL = 4Ω
CCMREF = 0.1μF
CCMREF = 1μF
WIDEBAND OUTPUT SPECTRUM
SPREAD-SPECTRUM MODEMAX8821 toc23
AMPLITUDE (dBV)10.10.01
RL = 8Ω
INPUTS AC GROUNDED
CLASS D AMP
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
WIDEBAND OUTPUT SPECTRUM
FIXED-FREQUENCY MODEMAX8821 toc24
FREQUENCY (MHz)
AMPLITUDE (dBV)10.10.01
RL = 8Ω
INPUTS AC GROUNDED
OUTPUT POWER
vs.SUPPLY VOLTAGE
MAX8821 toc25
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
THD+N = 10%
THD+N = 1%
RL = 8Ω
OUTPUT POWER
vs.SUPPLY VOLTAGE
MAX8821 toc26
SUPPLY VOLTAGE (V)
OUTPUT POWER (W)
THD+N = 10%
THD+N = 1%
RL = 4Ω
EFFICIENCY
vs.SUPPLY VOLTAGE
MAX8821 toc27
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
RL = 8Ω
RL = 4Ω
EFFICIENCY vs. OUTPUT POWER
MAX8821 toc28
EFFICIENCY (%)
RL = 8Ω
RL = 4Ω
VIN = 3.6V
EFFICIENCY
vs.OUTPUT POWER
MAX8821 toc29
EFFICIENCY (%)
RL = 8Ω
RL = 4Ω
VIN = 5V
Typical Operating Characteristics (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Typical Operating Characteristics (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
STARTUP WAVEFORMSMAX8821 toc30
1V/div
1V/div
AIN+ - AIN-
SPK+ - SPK-
AV = 0dB
SHUTDOWN WAVEFORMSMAX8821 toc31
1V/div
1V/div
AIN+ - AIN-
SPK+ - SPK-
AV = 0dB
LDO DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8821 toc32
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
LDO1
LDO2
LDO OUTPUT VOLTAGE
ACCURACY vs. LOAD CURRENTMAX8821 toc33
LOAD CURRENT (mA)
OUTPUT VOLTAGE ACCURACY (%)
VLDO2 = 2.8V
VLDO1 = 2.8V
LDO OUTPUT VOLTAGE
vs. TEMPERATUREMAX8821 toc34
OUTPUT VOLTAGE (V)3510-15
ILDO1 = 0AILDO2 = 0A
ILDO2 = 100mAILDO1 = 100mA
DUAL LDOs
LDO PSRR
vs. FREQUENCYMAX8821 toc35
FREQUENCY (kHz)
PSRR (dB)10.1
ILDO2 = 20mAILDO1 = 30mA
VIN-RIPPLE = 100mVP-P
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO10μs/div
LDO2 LOAD TRANSIENTMAX8821 toc39
AC-COUPLED
50mV/divVLDO2
ILDO20A
50mA/div
LDO SHUTDOWN RESPONSE
(LDO1, LDO2 UNLOADED)MAX8821 toc40
VLDO1
VLDO2
1V/div
1V/div
Typical Operating Characteristics (continued)(VIN1= VIN2= VIN3= VDD= 3.6V, VAGND= VPGND1= VPGND2= 0V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
200μs/div
LDO LINE TRANSIENT
(VIN3 = 3.6V TO 4.5V)MAX8821 toc37
4.5V
3.6V
AC-COUPLED
10mV/div
AC-COUPLED
10mV/div
VIN
VLDO1
VLDO2
ILDO1 = 150mA, ILDO2 = 100mA
10μs/div
LDO1 LOAD TRANSIENTMAX8821 toc38
AC-COUPLED
50mV/divVLDO1
ILDO10A
50mA/div
LDO OUTPUT SPECTRUMMAX8821 toc36
FREQUENCY (kHz)
AMPLITUDE (dBV)
0.0011000
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDO
Pin Description
PINNAMEFUNCTION1VDDI2C Input Supply Voltage. The VDD supply range is 1.5V to 5.5V. Drive VDD high to enable the I2C
control. Drive VDD low to place the IC into shutdown mode.CMREFAudio Common-Mode Reference Voltage. Bypass CMREF with a 0.1µF ceramic capacitor to AGND
as close as possible to the IC.AIN+Noninverting Audio InputAIN-Inverting Audio InputPGND2Audio Amplifier Power Ground. Connect PGND2 to the system ground plane.SPK-Audio Amplifier Negative OutputSPK+Audio Amplifier Positive OutputIN2
Audio Amplifier Output Buffer Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Connect
IN2 directly to IN1 and IN3. Bypass IN2 to PGND2 with a 1µF ceramic capacitor as close as possible
to the IC. IN2 is high impedance during shutdown.LDO2200mA LDO Output. Bypass LDO2 to AGND with a 1µF ceramic capacitor. LDO2 is disabled through
the I2C interface.LDO1300mA LDO Output. Bypass LDO1 to AGND with a 2.2µF ceramic capacitor. LDO1 is disabled
through the I2C interface.SCLI2C Clock Input. Data is read on the rising edge of VSCL.SDAI2C Data Input. Data is read on the rising edge of VSCL..AGNDAnalog Ground. Connect AGND to the system ground plane. AGND is also internally connected to
the exposed paddle.REFRefer ence Byp ass. Byp ass RE F w i th a 0.1µF cer am i c cap aci tor to AG N D as cl ose as p ossi b l e to the IC .
15–20LED1–
LED6
LED Current Regulators. Current flowing into LED_ is based upon the internal I2C registers. Connect
LED_ to the cathodes of the external LEDs. LED_ is high impedance during shutdown. If unused,
short LED_ to IN1 to disable the regulator.NEGCharge-Pump Negative Output. Connect a 1µF ceramic capacitor from NEG to AGND. In shutdown,
an internal 10kΩ resistor connects NEG to AGND.C2NTransfer Capacitor 2 Negative Connection. Connect a 1µF ceramic capacitor from C2P to C2N.C1NTransfer Capacitor 1 Negative Connection. Connect a 1µF ceramic capacitor from C1P to C1N.C2PTransfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N.C1PTransfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P to C1N.IN1
Charge-Pump Supply Voltage Input. The input voltage range is 2.7V to 5.5V. Connect IN1 directly to
IN2 and IN3. Bypass IN1 to PGND1 with a 2.2µF ceramic capacitor as close as possible to the IC.
IN1 is high impedance during shutdown.PGND1Charge-Pump Power Ground. Connect PGND1 to the system ground plane.IN3
Input Voltage Supply for LDO1, LDO2, REF, Class D Preamplifier, and Class D Amplifier Modulator
Core. The input voltage range is 2.7V to 5.5V. Connect IN3 directly to IN1 and IN2. Bypass IN3 to
AGND with a 2.2µF ceramic capacitor as close as possible to the IC. IN3 is high impedance during
shutdown.
—EPExposed Paddle. Connect the exposed paddle to AGND directly under the IC. Exposed paddle is
internally connected to AGND.
MAX8821
White LED Charge Pump with Mono Class D
Audio Amp and Dual LDOSDA
SCL
PGND1
REF
AGND
LED3
LED4
LED5
LED6
LED1
INVERTING
CHARGE PUMP
CURRENT
SOURCE
CONTROL
IN1
REFERENCE
IN3
LED2CMREF
SELECT
MINIMUM
I2C INTERFACE AND
LOGIC CONTROL
LDO1
LDO2
LDO1
LDO2
SPK+
SPK-CLASS D
AMP
PGND2
IN2
PGA
AIN-
AIN+
ADAPTIVE
CURRENT
REGULATORS
OSCILLATOR
NEG
NEG
NEG
NEG
NEG
NEG
NEG
REF
PGND2PGND2
OUTPUT
BUFFER
VDD
IN3
C2NC2PC1NC1P
MAX8821
OSCILLATOR
Figure 1. Block Diagram
