MAX8822ETE+ ,Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFNApplicationsWhite LED BacklightingPKGPART PIN-PACKAGE TOP MARKCODECell Phones and Smartphones16 Thi ..
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MAX8822ETE+
Ultra-Efficient Negative Charge-Pump LED Driver with Dual LDOs in 3mm x 3mm Thin QFN
General DescriptionThe MAX8822 drives up to four white light-emitting
diodes (LEDs) with regulated constant current for dis-
play backlighting in cell phones, digital cameras, PDAs,
and other handheld devices. By utilizing a proprietary
negative 0.5x inverting charge pump and innovative
independent low-dropout (LDO) adaptive current regu-
lators, very high efficiency is achieved over the full
1-cell Li+ battery voltage range, even with large LED VF
mismatch. The 1MHz fixed-frequency switching allows
for tiny external components. The regulation scheme is
optimized to ensure low EMI and low input ripple. Two
200mA, low-noise, high power-supply-rejection-ratio
(PSRR) LDOs with programmable output voltages are
included on-chip to provide power to camera modules
or other devices.
The MAX8822 features a single-wire, serial-pulse control-
logic interface that programs LED current and the output
voltages of the LDOs. The LED dimming range is pseu-
do-logarithmic from 24mA to 0.1mA in 31 steps. LDO
output voltages are programmable in 16 different combi-
nations to meet various camera module requirements.
The MAX8822 includes soft-start, thermal shutdown,
open- and short-circuit protection.
ApplicationsWhite LED Backlighting
Cell Phones and Smartphones
FeaturesHigh-Efficiency Charge Pump for Up to Four
White LEDs
Independent Adaptive Voltage Supply for Each
LED
24mA to 0.1mA Dimming Range
1% (typ) Current Accuracy and 0.3% Current
Matching
Low 65µA (typ) Quiescent Current Dual 200mA Low-Noise, High PSRR LDOs
16 Different Output Voltage Combinations Up to
3.3V
High 60dB PSRR at 10kHzFlexible Single-Wire Control for Dimming and
LDO Output VoltageLow 0.5µA (typ) Shutdown ModeSoft-Start Limits Inrush CurrentThermal Shutdown and Open- and Short-Circuit
ProtectionTiny 16-Pin, 3mm x 3mm Thin QFN Package
(0.8mm max Height) with Exposed Paddle
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN19-0847; Rev 0; 11/07
EVALUATION KIT
AVAILABLEC1PC2P
LED2LED3LDO1
ENLED109
ENLDO
REF
LED4
NEG
C1N
C2N
MAX8822
GND
LED1
LDO2
THIN QFNTOP VIEW
Pin Configuration
Ordering InformationC1PC1N
LED1
LED2
LED3
LED4
LDO1
LDO2
GND
REF
INPUT
2.7V TO 5.5V
C2NC2P
1μF
0.1μF
2.2μF
4.7μF
NEGENLED
ENLDO
UP TO 24mA/LED
1μF
SERIAL-
PULSE
CONTROL
INTERFACE
VLDO2
VLDO1
1μF1μF
MAX8822
Typical Operating Circuit
PARTPIN-PACKAGETOP MARKPKG
CODEMAX8822ETE+16 Thin QFN-EP*
(3mm x 3mm)AFWT1633-5
Note:The device is specified over the -40°C to +85°C extend-
ed temperature range.
+Denotes a lead-free package.
*EP = Exposed paddle.
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
ABSOLUTE MAXIMUM RATINGSStresses 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.
IN, C1N, C2N, REF, ENLED, ENLDO, LDO1, LDO2
to GND...............................................................-0.3V to +6.0V
IN, REF, ENLED, ENLDO, LDO1, LDO2
to NEG...............................................................-0.3V to +6.0V
LED_, C1N, C2N to NEG.............................-0.3V to (VIN+ 0.3V)
C1P, C2P to GND........................................-0.3V to (VIN+ 0.3V)
NEG to GND..........................................................-6.0V to +0.3V
NEG, LDO1, LDO2 Short-Circuit Current to GND......Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin Thin QFN 3mm x 3mm
(derate 14.7mW/°C above +70°C).............................1177mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VIN= 3.6V, VGND= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITSIN Operating Voltage2.75.5V
Undervoltage Lockout (UVLO)
ThresholdVIN rising2.252.452.65V
UVLO Hysteresis100mV
TA = +25°C0.55Shutdown Supply CurrentENLED = ENLDO = GNDTA = +85°C0.5µA
Charge pump inactive,
ILED1 = ILED2 = ILED3 = ILED4 = 0.1mA65100µA
IN Operating Supply CurrentCharge pump active, VIN = 2.7V, 1MHz switching,
ILED1 = ILED2 = ILED3 = ILED4 = 0.1mA1.4mA
Thermal-Shutdown Threshold160°C
Thermal-Shutdown Hysteresis20°C
SERIAL-PULSE CONTROLLogic Input-High Voltage (VIH)VIN = 2.7V to 5.5V1.4V
Logic Input-Low Voltage (VIL)VIN = 2.7V to 5.5V0.4V
TA = +25°C0.011Logic Input CurrentVIL = 0V or VIH = 5.5VTA = +85°C0.1µA
tSHDNSee Figures 1 and 2 (Note 2)2.5ms
tLOSee Figures 1 and 20.5500µs
tHISee Figures 1 and 20.5500µs
tINITFirst high pulse from shutdown (Figures 1 and 2)100µs
tHOLDPulse width to latch EN_ count (Figures 1 and 2) (Note 3)2.5ms
CHARGE PUMPSwitching Frequency1MHz
Soft-Start Time0.5ms
Charge-Pump Regulation Voltage(VIN - VNEG)5V
Open-Loop NEG Output
Resistance(VNEG - 0.5 x VIN) / INEG2.85.0Ω
NEG Shutdown DischargeAll LEDs off, EN_ = GND10kΩ
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
ELECTRICAL CHARACTERISTICS (continued)(VIN= 3.6V, VGND= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
CURRENT REGULATOR (LED1–LED4)Programmable Current Range0.124.0mA
ILED_ = 24mA, TA = +25°C-2±1+2
ILED_ = 24mA, TA = -40°C to +85°C-3+3Current Accuracy
ILED_ = 0.1mA, TA = +25°C±5
Charge pump inactive60120LED_ Dropout VoltageILED_ = 24mA (Note 4)Charge pump active80250mV
LED_ Current Regulator
Switchover Threshold (Inactive to
Active)
VLED_ falling125150175mV
LED_ Current Regulator
Switchover Hysteresis100mV
TA = +25°C0.015LED_ Shutdown Leakage CurrentAll LEDs off,
ENLED = GNDTA = +85°C0.1µA
LDO_Output Current(Note 5)200mA
Current LimitVLDO = 0V220750mA
LDO1 Dropout VoltageILDO1 = 200mA, VLDO1 = 2.8V (Notes 5 and 6)150250mV
LDO2 Dropout VoltageILDO2 = 200mA, VLDO2 = 2.8V (Notes 5 and 6)300550mV
Line Regulation3.4V ≤ VIN < 5.5V, ILDO = 100mA1mV/V
Load Regulation50µA < ILDO < 200mA0.1mV/mA
Power-Supply Rejection
ΔVOUT/ΔVIN10Hz to 10kHz, CLDO = 1µF, ILDO = 30mA60dB
Output Noise Voltage (RMS)100Hz to 100kHz, CLDO = 1µF, ILDO = 30mA45µVRMS
ENLDO count = 51.2
ENLDO count = 6, 131.8
ENLDO count = 1, 3, 7, 9, 142.7162.8002.884LDO1 Output VoltageILDO1 = 100mA (Note 7)
ENLDO count = 2, 4, 8, 153.3
ENLDO count = 1, 21.2
ENLDO count = 3, 4, 101.5
ENLDO count = 5, 6, 7, 8, 111.7461.8001.854LDO2 Output VoltageILDO2 = 100mA (Note 7)
ENLDO count = 9, 122.8
Ground CurrentILDO = 500µA50µA
Shutdown Output ImpedanceENLDO = GND1kΩ
Note 1:Limits are 100% production tested at TA= +25°C. Specifications over the operating temperature range are guaranteed by design.
Note 2:Hold EN_ low for at least 2.5ms to guarantee shutdown.
Note 3:Hold EN_ high for at least 2.5ms to latch EN count.
Note 4:LED dropout voltage is defined as the LED_ to GND voltage when current into LED_ drops 10% from the value at VLED= 0.5V.
Note 5:Guaranteed by design, not production tested.
Note 6:LDO dropout voltage is defined as VIN - VOUTwhen VOUThas dropped 100mV below the initial value of VOUTwhen
VIN= VOUT+ 0.8V.
Note 7:LDO output voltage corresponds to the LDO output voltage programmed by pulsing ENLDO low by the given count and
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
Typical Operating Characteristics(VIN= 3.6V, VEN_= VIN, Circuit of Typical Operating Circuit, TA= +25°C, unless otherwise noted.)
EFFICIENCY vs. SUPPLY VOLTAGE
(4 MATCHED WLEDs)
MAX8822 toc01
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
20.8mA/LED
14.4mA/LED
6.4mA/LED
1.6mA/LED
VIN FALLING
EFFICIENCY vs. SUPPLY VOLTAGE
(4 MISMATCHED WLEDs)
MAX8822 toc02
SUPPLY VOLTAGE (V)
EFFICIENCY (%)1.6mA/LED
VIN FALLING
14.4mA/LED
EFFICIENCY vs. SUPPLY VOLTAGE
(4 MISMATCHED WLEDs)
MAX8822 toc03
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
6.4mA/LED
VIN FALLING
20.8mA/LED
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(4 MATCHED WLEDs)
MAX8822 toc04
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY (%)
20mA/LED
1.6mA/LED6.4mA/LED
14.4mA/LED
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(4 MISMATCHED WLEDs)
MAX8822 toc05
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY (%)
14.4mA/LED
1.6mA/LED
EFFICIENCY vs. Li+ BATTERY VOLTAGE
(4 MISMATCHED WLEDs)
MAX8822 toc06
Li+ BATTERY VOLTAGE (V, TIME-WEIGHTED)
EFFICIENCY (%)
20.8mA/LED
6.4mA/LED
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(4 WLEDs)
MAX8822 toc07
SUPPLY CURRENT (mA)
VIN FALLING MISMATCHED LEDs
20.8mA/LED
14.4mA/LED
1.6mA/LED
6.4mA/LED
SUPPLY CURRENT vs. SUPPLY VOLTAGE
(RGB MODULE)
MAX8822 toc08
SUPPLY CURRENT (mA)
RGB MODULE: LUMEX SML-LX3632SISUGSBC,
VIN FALLING
20.8mA/LED
14.4mA/LED
6.4mA/LED
1.6mA/LED
INPUT VOLTAGE RIPPLE
vs. SUPPLY VOLTAGE (4 WLEDs)
MAX8822 toc09
INPUT VOLTAGE RIPPLE (mV
RMS
VIN FALLING, MISMATCHED LEDs
20.8mA/LED
14.4mA/LED
6.4mA/LED
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFNLED CURRENT MATCHING
vs. SUPPLY VOLTAGE
MAX8822 toc10
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
16mA/LED, VIN FALLING
400ns/div
TYPICAL OPERATING WAVEFORMS
(CHARGE PUMP INACTIVE)VIN
IIN100mA (AC-COUPLED)
10mA/div
10mV/div
(AC-COUPLED)
24mA (AC-COUPLED)
10mA/div
MAX8822 toc11
ILED1
4 LEDs, 24mA/LED,
VIN = 3.8V
400ns/div
TYPICAL OPERATING WAVEFORMS
(CHARGE PUMP ACTIVE)VIN
IIN100mA (AC-COUPLED)
10mA/div
10mV/div
(AC-COUPLED)
24mA (AC-COUPLED)
10mA/div
MAX8822 toc12
ILED1
4 LEDs, 24mA/LED,
VIN = 3.2V
1ms/div
STARTUP AND SHUTDOWNVENLED
IIN
VIN
100mA/div
100mA/div
5V/div
24mV/div
(AC-COUPLED)
MAX8822 toc13
ILED_TOTALILED_ = 24mA
1ms/div
SERIAL-PULSE CONTROL
DIMMING RESPONSEVENLED
ILED1
50mA/div
5V/div
10mA/div
MAX8822 toc14
IIN
24mA
14.4mA
4 LEDs
7 PULSES
400μs/div
SERIAL-PULSE CONTROL LDO
VOLTAGE PROGRAMMINGVENLDO
ILDO2
2V/div
5V/div
1V/div
MAX8822 toc15
ILDO1
1.8V
3.3V
ILDO1 = ILDO2 = 100mAPULSES
ypical Operating Characteristics (continued)(VIN= 3.6V, VEN_= VIN, Circuit of Typical Operating Circuit, TA= +25°C, unless otherwise noted.)
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN20μs/div
LDO2 LOAD TRANSIENTVLDO2
50mA/div
20mV/div
(AC-COUPLED)
MAX8822 toc19
ILDO2
150mA
10mA
VLDO2 = 1.8V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX8822 toc20
FREQUENCY (kHz)
PSRR (dB)
IOUT = 10mA
COUT = 1μF
400μs/div
LDO OUTPUT NOISE50μV/div
MAX8822 toc21
VLDO = 2.8V, ILDO = 28mA
Typical Operating Characteristics (continued)(VIN= 3.6V, VEN_= VIN, Circuit of Typical Operating Circuit, TA= +25°C, unless otherwise noted.)
20μs/div
LDO1 LOAD TRANSIENTVLDO1
50mA/div
20mV/div
(AC-COUPLED)
MAX8822 toc18
ILDO1
150mA
10mA
VLDO1 = 2.8V
1ms/div
LINE-TRANSIENT RESPONSE
(NO MODE CHANGE)VIN
IIN
100mA/div
4.2V
500mV/div
(AC-COUPLED)
MAX8822 toc16
ILED_TOTAL
0mA
0mA
100mA/div
ILED_ = 24mA
3.7V
1ms/div
LINE-TRANSIENT RESPONSE
(MODE CHANGE)VIN
IIN
100mA/div
3.8V
500mV/div
(AC-COUPLED)
MAX8822 toc17
ILED_TOTAL
0mA
0mA
100mA/div
ILED_ = 24mA
3.4V
MAX8822
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
Pin Description
PINNAMEFUNCTION1INSupply Voltage Input. Bypass IN to GND with a 4.7µF ceramic capacitor placed as close as possible
to the IC. The input voltage range is 2.7V to 5.5V.GNDGround. Connect to system ground. GND is used for charge-pump switching currents.C1PTransfer Capacitor 1 Positive Connection. Connect a 1µF ceramic capacitor from C1P to C1N.C2PTransfer Capacitor 2 Positive Connection. Connect a 1µF ceramic capacitor from C2P to C2N.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.NEGCharge-Pump Output. Bypass NEG to GND with a 2.2µF ceramic capacitor placed as close as
possible to the IC.
8–11LED4–LED1
LED Current Regulators. Connect LED_ to the cathodes of the external LEDs. LED_ is high
impedance in shutdown. Connect any unused LED_ to IN to disable the corresponding current
regulator. LED_ current is programmed by pulsing ENLED as described in the LED Dimming Control
section.LDO1
LD O1 Outp ut. Byp ass LD O 1 to GN D w i th a 1µF cer am i c cap aci tor p l aced as cl ose as p ossi b l e to the IC .
The LD O 1 and LD O2 outp ut vol tag e com b i nati on i s sel ected b y p ul si ng E N LD O l ow . S ee the LD O1/LD O2
Outp ut V ol tag e C ontr ol secti on.LDO2
LD O2 Outp ut. Byp ass LD O 2 to GN D w i th a 1µF cer am i c cap aci tor p l aced as cl ose as p ossi b l e to the IC .
The LD O 1 and LD O2 outp ut vol tag e com b i nati on i s sel ected b y p ul si ng E N LD O l ow . S ee the LD O1/LD O2
Outp ut V ol tag e C ontr ol secti on.ENLEDWLED Enable and Dimming Control Input. Pulse ENLED low to program LED_ current. Hold ENLED
low for at least 2.5ms to place the LED drivers in shutdown. See the LED Dimming Control section.ENLDO
LDO Enable and Voltage Control Input. Pulse ENLDO low to program the output voltage of both
LDO1 and LDO2 to one of sixteen different combinations. Hold ENLDO low for at least 2.5ms to
place the LDOs in shutdown. See the LDO1/LDO2 Output Voltage Control section.REFRefer ence. Byp ass RE F to GN D w i th a 0.1µF cer am i c cap aci tor p l aced as cl ose as p ossi b l e to the IC .R E F r eg ul ates to 1.2V ( typ ) .
—EPExposed Paddle. Connect EP to GND. For good thermal dissipation, solder the exposed paddle to
the power ground plane.
MAX8822
Detailed DescriptionThe MAX8822 drives up to four white LEDs (WLEDs) with
regulated constant current for display backlighting in cell
phones, cameras, PDAs, and other handheld devices.
The IC also includes two low-noise, high-PSRR, 200mA
LDOs for powering camera modules or other devices.
Figure 3 depicts the MAX8822 block diagram.
The MAX8822 IC utilizes a 0.5x inverting charge pump
and extremely low-dropout current regulators to
achieve high efficiency over the full 1-cell Li+ battery
voltage range. The charge pump remains inactive
unless the LED current regulators require additional
voltage to prevent them from entering dropout. To max-
imize efficiency, the current regulators operate with as
little as 150mV voltage drop. Additionally, each LED
current regulator is independently monitored and
switched, ensuring the least possible power consump-
tion to extend battery life (see the Adaptive Current
Regulator Switchoversection for details).
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFNENLED234
tHOLD
2.5ms
24.0mA22.4mA20.8mASHDN19.2mA
SHDN
19.2mA31413
4.8mA5.6mA24.0mA22.4mA20.8mA
tHOLD
2.5ms
4.8mA
tSHDN
2.5ms
SHDN
tINIT = 120μs
tHI = 500ns TO 500μs
tLO = 500ns TO 500μs
ILED_
SHDN
INTERNAL
CURRENT
SETTING
tLOtHItINIT
Figure 1. Timing Characteristics for LED Serial-Pulse Control Interface
ENLDO123
tHOLD
2.5ms2.8V3.3VSHDN2.8V
SHDN231312
1.8V0V2.8V3.3V2.8V
tHOLD
2.5ms
1.8V
tSHDN
2.5ms
SHDNVLDO1
SHDN
INTERNAL
LDO1
SETTING
INTERNAL
LDO2
SETTING1.2V1.2VSHDN1.5V
VLDO2
2.8V
1.5V
1.2V1.2V1.5V0V2.8V
SHDN0V
SHDN
tLOtHItINIT
tINIT = 120μs
tHI = 500ns TO 500μs
tLO = 500ns TO 500μs
Figure 2. Timing Characteristics for LDO Serial-Pulse Control Interface
