MAX8645XETI+-MAX8645XETI+T-MAX8645YETI+-MAX8645YETI+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX8645XETI+ ,1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFNApplicationsProtectionCamera Phones and Smartphones♦ 28-Pin TQFN, 4mm x 4mm PackageBacklighting and ..
MAX8645XETI+T ,1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFNELECTRICAL CHARACTERISTICS(V = 3.6V, V = V = 0V, ENM1 = ENM2 = ENF = IN, R = R = 6.8kΩ, P1 = P2 = u ..
MAX8645YETI , 1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
MAX8645YETI+ ,1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFNMAX8645X/MAX8645Y19-3978; Rev 4; 6/081x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm T ..
MAX8645YETI+T ,1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFNFeaturesThe MAX8645X/MAX8645Y charge pumps drive up to♦ Power Up to Eight LEDseight white LEDs with ..
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MAX8645XETI+-MAX8645XETI+T-MAX8645YETI+-MAX8645YETI+T
1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
EVALUATION KIT
AVAILABLE
General Description
The MAX8645X/MAX8645Y charge pumps drive up to
eight white LEDs with regulated constant current for uni-
form intensity. The main group of LEDs (M1–M6) can be
driven up to 30mA per LED for backlighting. The flash
group of LEDs (F1 and F2) is independently controlled
and can be driven up to 200mA per LED (or 400mA total).
Two 200mA LDOs are on-board to provide power for
camera functions. The LDOs’ output voltages are pin pro-
grammable to meet different camera-module require-
ments. The MAX8645X and MAX8645Y differ only in LDO
output voltages. By utilizing adaptive 1x/1.5x/2x charge-
pump modes and very-low-dropout current regulators,
the MAX8645X/MAX8645Y achieve high efficiency over
the full 1-cell lithium-battery voltage range. The 1MHz
fixed-frequency switching allows for tiny external compo-
nents, and the regulation scheme is optimized to ensure
low EMI and low input ripple.
The MAX8645X/MAX8645Y are available in a 28-pin TQFN,
4mm x 4mm (0.8mm max height) lead-free package.
Applications
Camera Phones and Smartphones
Backlighting and Flash
PDAs, Digital Cameras, and Camcorders
FeaturesPower Up to Eight LEDs
Up to 30mA/LED Drive for Backlight
Up to 400mA Total Drive for FlashTwo Internal Low-Noise 200mA LDOs94% Max/85% Avg Efficiency (PLED/PBATT) over Li+
Battery Discharge0.2% Typical LED Current MatchingAdaptive 1x/1.5x/2x Mode SwitchoverSingle-Wire, Serial-Pulse Interface for Brightness
Control (32 Steps)Thermal TADerating FunctionLow Input Ripple and EMI2.7V to 5.5V Supply Voltage RangeSoft-Start, Overvoltage, and Thermal-Shutdown
Protection28-Pin TQFN, 4mm x 4mm Package
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with wo LDOs in 4mm x 4mm TQFN
Ordering Information
19-3978; Rev 4; 6/08
PARTTEMP RANGEPIN-PACKAGE
MAX8645XETI+-40°C to +85°C28 TQFN-EP
4mm x 4mm
MAX8645YETI+-40°C to +85°C28 TQFN-EP
4mm x 4mm
Pin Configuration appears at end of data sheet.
MAIN ON/OFF
AND DIMMING
MAX8645X
MAX8645Y
1μF
10μF
0.01μF
10μF
PIN
PGND
GND
OUT
MAINFLASH
OUTPUT
UP TO 580mA
1μF1μF
LDO1
LDO2
C2PC2N
1μF
C1PC1N
REFSETMSETF
CAMERA
MODULEDUAL-LDO
VOLTAGE
SELECTION
INPUT
2.7V TO 5.5V
ENM2
ENM1
ENF
ENLDOFLASH ON/OFF
DUAL-LDO ON/OFF
Typical Operating Circuit
EP = Exposed pad.
+Denotes a lead-free package.
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 3.6V, VGND= VPGND= 0V, ENM1 = ENM2 = ENF = IN, RSETM= RSETF= 6.8kΩ, P1 = P2 = unconnected, CREF= 0.01µF, = -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.
PIN, IN, OUT, REFBP to GND................................-0.3V to +6.0V
SETF, SETM, ENLDO, ENM1, ENM2, ENF,
P1, P2, LDO1, LDO2 to GND....................-0.3V to (VIN+ 0.3V)
M1, M2, M3, M4, M5, M6, F1,
F2 to GND.............................................-0.3V to (VOUT+ 0.3V)
C1N, C2N to GND.........................................-0.3V to (VIN+ 1V)
C1P, C2P
to GND........-0.3V to the greater of (VOUT+ 1V) or (VIN+ 1V)
PGND to GND.......................................................-0.3V to +0.3V
OUT, LDO1, LDO2 Short Circuit to GND...................Continuous
Continuous Power Dissipation (TA= +70°C)
28-Pin TQFN 4mm x 4mm
(derate 20.8mW/°C above +70°C).............................1666mW
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
PARAMETERCONDITIONSMINTYPMAXUNITS
IN Operating Voltage2.75.5V
Undervoltage-Lockout ThresholdVIN rising or falling2.252.452.60V
Undervoltage-Lockout Hysteresis130mV
1MHz switching, no load, 1.5x or 2x mode4.05.5
1x mode 10% setting, ENF = GND, VENLDO = VIN,
ILDO1 = ILDO2 = 0A0.4mA
Supply Current
ENM1 = ENM2 = ENF = GND, VENLDO = VIN,
ILDO1 = ILDO2 = 0A110µA
TA = +25°C0.015Shutdown Supply CurrentENM1 = ENM2 = ENF = ENLDO = GNDTA = +85°C0.1µA
EN_ High VoltageVIN = 2.7V to 5.5V1.4V
EN_ Low VoltageVIN = 2.7V to 5.5V0.4V
TA = +25°C0.011EN_ Input CurrentVEN_ = 0V or 5.5VTA = +85°C0.1µA
ENM_ or ENF Low Shutdown
Delay tSHDNSee Figure 12.5ms
ENM_ or ENF tLOSee Figure 10.5250.0µs
ENM_ or ENF tHISee Figure 10.5µs
Initial ENM_ or ENF tHIOnly required for first ENM_ or ENF pulse; see Figure 1200µs
P1, P2 Shutdown Input Current1µA
P1, P2 Input Impedance150kΩ
Thermal-Shutdown ThresholdTemperature rising+160°C
Thermal-Shutdown Hysteresis20°C
CHARGE PUMP
Overvoltage-Protection ThresholdVOUT rising5V
Soft-Start Time2ms
MAX8645X/MAX8645Y
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 3.6V, VGND= VPGND= 0V, ENM1 = ENM2 = ENF = IN, RSETM= RSETF= 6.8kΩ, P1 = P2 = unconnected, CREF= 0.01µF, = -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
1x to 1.5x or 1.5x to 2x Mode
Transition Threshold90100110mV
Input Voltage-Mode Transition
Hysteresis150mV
Charge-Pump Maximum OUT
CurrentVIN ≥ 3.15V, VOUT = 3.9V580mA
1x mode (VIN - VOUT) / IOUT0.31.0
1.5x mode (1.5VIN - VOUT) / IOUT1.14.0Open-Loop OUT Resistance
2x mode (2VIN - VOUT) / IOUT1.54.14
Charge-Pump Short-Circuit
CurrentVOUT < 1.25V500mA
Switching Frequency1MHz
OUT Pulldown Resistance in
ShutdownENM_ = ENF = GND5kΩ
LED DRIVER
SET_ Bias VoltageTA = +25°C0.6V
TA = +25°C0.011SET_ Leakage in ShutdownENM_ = ENF = GNDTA = +85°C0.1µA
SET_ Current Range10145µA
SETM-to-Main LED Current Ratio
(IM_/ISETM)100% setting, M1–M6230A/A
SETF-to-Flash LED Current Ratio
(IF_/ISETF)100% setting, F1 and F21380A/A
TA = +25°C-1.25+1.25M_, F_ Current AccuracyTA = -40°C to current derating start temperature-4+4%
Maximum Main LED Sink CurrentRSETM = 4.6kΩ, for each M_30mA
Maximum Flash LED Sink CurrentRSETF = 4.12kΩ, IF1 + IF2400mA
Current-Derating-Function Start
Temperature+40°C
Current-Derating-Function SlopeTA = +40°C to +85°C-1.7%/°C
Dropout Voltage(Note 2)4090mV
1.5x and 2x Regulation Voltage150mV
TA = +25°C0.012M_, F_ Leakage in ShutdownENM_ = ENF = GNDTA = +85°C0.1µA
LDO_
Output Voltage AccuracyILDO_ = 150mA, relative to VOUT(NOM) (Note 3)-1.70+1.7%
Output Current Range0200mA
Current LimitVLDO_ = 0V280475750mA
Soft-Start Current Limit160mA
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with wo LDOs in 4mm x 4mm TQFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 3.6V, VGND= VPGND= 0V, ENM1 = ENM2 = ENF = IN, RSETM= RSETF= 6.8kΩ, P1 = P2 = unconnected, CREF= 0.01µF, = -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
Soft-Start Done Time100µs
Dropout VoltageILDO_ = 200mA (Note 4)120320mV
Load RegulationVIN = 3.7V, 100µA < ILDO_ < 200mA1.3%
Power-Supply Rejection
ΔVOUT/ΔVIN10Hz to 10kHz, CLDO_ = 1µF, ILDO_ = 10µA-60dB
Output Noise Voltage (RMS)10Hz to 100kHz, CLDO_ = 1µF, ILDO_ = 10mA40µVRMS
Note 1:All devices are 100% production tested at TA= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 2:LED dropout voltage is defined as the M_ or F_ to GND voltage at which current into M_ or F_ drops 10% from the value at
M_ or F_ = 0.2V.
Note 3:(Greater of 2.7V or (VLDO_+ 0.5V)) ≤VIN≤5.5V.
Note 4:LDO dropout voltage is defined as VIN- VOUTwhen VOUTis 100mV below the value of VOUTmeasured when VIN=
VOUT(NOM)+ 1V. Since the minimum input voltage is 2.7V, this specification is only meaningful when VOUT(NOM)> 2.5V.
Typical Operating Characteristics
(VIN= VEN_= 3.6V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
EFFICIENCY vs. Li+ BATTERY
VOLTAGE DRIVING SIX MAIN LEDs
MAX8645Y toc01
Li+ BATTERY VOLTAGE (V)
EFFICIENCY P
LED
BATT
(%)
15mA/LED
4.5mA/LED
1.5mA/LED
EFFICIENCY vs. Li+ BATTERY
VOLTAGE DRIVING FLASH LED MODULE
MAX8645Y toc02
Li+ BATTERY VOLTAGE (V)
EFFICIENCY P
LED
BATT
(%)
80mA TOTAL
160mA TOTAL
400mA TOTAL
BATTERY CURRENT vs. SUPPLY VOLTAGE
DRIVING SIX MAIN LEDs
MAX8645Y toc03
SUPPLY VOLTAGE (V)
BATTERY CURRENT (mA)
ILED = 15mA
ILED = 4.5mA
ILED = 1.5mA
VIN FALLING
VIN RISING
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with wo LDOs in 4mm x 4mm TQFN
BATTERY CURRENT vs. SUPPLY
VOLTAGE DRIVING FLASH
MAX8645Y toc04
SUPPLY VOLTAGE (V)
BATTERY CURRENT (mA)
IFLASH = 400mA
IFLASH = 160mA
IFLASH = 80mA
LDO GROUND-PIN SUPPLY
CURRENT vs. SUPPLY VOLTAGE
MAX8645Y toc05
SUPPLY VOLTAGE (V)
GROUND-PIN SUPPLY CURRENT (
VENM_ = VENF = 0V, VENLDO = VIN
150mA, BOTH LDOsNO LOAD, BOTH LDOs
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE WITH SIX MAIN LEDs
MAX8645Y toc06
SUPPLY VOLTAGE (V)
INPUT RIPPLE (mV
RMS
ILED = 15mA
ILED = 4.5mA
ILED = 1.5mA
INPUT RIPPLE VOLTAGE vs. SUPPLY
VOLTAGE WITH FLASH AND MAIN LEDs
MAX8645Y toc07
SUPPLY VOLTAGE (V)
INPUT RIPPLE (mV
RMS
FOUR MAIN LEDs AT 15mA EACH
IFLASH = 40mA
IFLASH = 160mA
IFLASH = 400mA
LED CURRENT MATCHING vs. SUPPLY
VOLTAGE WITH SIX MAIN LEDs
MAX8645Y toc08
SUPPLY VOLTAGE (V)
MAIN LED CURRENT (mA)
LED CURRENT MATCHING vs. SUPPLY
VOLTAGE WITH TWO FLASH LEDs
MAX8645Y toc09
SUPPLY VOLTAGE (V)
FLASH LED CURRENT (mA)
LED CURRENT vs. AMBIENT
TEMPERATURE WITH SIX MAIN LEDs
MAX8645Y toc10
TA (°C)
TOTAL LED CURRENT (mA)3510-15
LED CURRENT vs. AMBIENT
TEMPERATURE WITH FLASH
MAX8645Y toc11
TA (°C)
TOTAL LED CURRENT (mA)3510-15
INDIVIDUAL MAIN LED CURRENT
vs. RSETM
MAX8645Y toc12
RSETM (kΩ)
MAIN LED CURRENT (mA)
Typical Operating Characteristics (continued)
(VIN= VEN_= 3.6V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
MAX8645X/MAX8645Y
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
INDIVIDUAL FLASH LED CURRENT
vs. RSETF
MAX8645Y toc13
RSETF (kΩ)
FLASH LED CURRENT (mA)
OPERATING WAVEFORMS (1x MODE)
MAX8645Y toc14
50mV/div
AC-COUPLED
20mV/div
AC-COUPLED
2mA/div
AC-COUPLED
VOUT
VIN
IIN
400ns/div
6 MAIN LEDS AT 20mA EACH
OPERATING WAVEFORMS (1.5x MODE)
MAX8645Y toc15
50mV/div
AC-COUPLED
20mV/div
AC-COUPLED
2mA/div
AC-COUPLED
VOUT
VIN
IIN
400ns/div
6 MAIN LEDS AT 20mA EACH
OPERATING WAVEFORMS (2x MODE)
MAX8645Y toc16
50mV/div
AC-COUPLED
20mV/div
AC-COUPLED
2mA/div
AC-COUPLED
VOUT
VIN
IIN
400ns/div
6 MAIN LEDS AT 20mA EACH,
FLASH AT 400mA TOTAL
STARTUP AND SHUTDOWN
MAIN LED RESPONSE
MAX8645Y toc17
5V/div
100mA/div
5V/div
VENM_
IOUT
VOUT
1ms/div
6 MAIN LEDS AT 20mA EACH
STARTUP AND SHUTDOWN
FLASH LED RESPONSE
MAX8645Y toc18
5V/div
500mA/div
500mA/div
5V/div
VENF
IIN
VOUT
IOUT
1ms/div
6 MAIN LEDS AT 20mA EACH,
400mA TOTAL FLASH
Typical Operating Characteristics (continued)
(VIN= VEN_= 3.6V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)
MAX8645X/MAX8645Y
SINGLE-WIRE DIMMING RESPONSE
MAX8645Y toc19
5V/div
500mA/div
2V/div
VENM1,
VENM2
IOUT
VOUT
10ms/div
1x/1.5x/2x White LED Charge Pumps with Two
LDOs in 4mm x 4mm TQFN
LDO DROPOUT VOLTAGE
vs. OUTPUT CURRENT
MAX8645Y toc20
OUTPUT CURRENT (mA)
DROPOUT VOLTAGE (mV)
LDO OUTPUT VOLTAGE
ACCURACY vs. OUTPUT CURRENT
MAX8645Y toc21
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE ACCURACY (%)
LOAD-TRANSIENT RESPONSE
MAX8645Y toc22
50mV/div
AC-COUPLED
100mA
1mA
VLDO_
ILDO_
10μs/div
VLDO_ = 2.6V
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX8645Y toc23
50mV/div
AC-COUPLED
100mA
1mA
VLDO_
ILDO_
10μs/div
VIN - VOUT = 77mV, VLDO_ = 2.6V
Typical Operating Characteristics (continued)
(VIN= VEN_= 3.6V, circuit of Figure 2, TA= +25°C, unless otherwise noted.)

Partno	Mfg	Dc	Qty	Available	Descript
MAX8645XETI+ \|MAX8645XETI	MAXIM	N/a	18175	avai	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
MAX8645XETI+T \|MAX8645XETIT	MAXIM	N/a	845	avai	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
MAX8645YETI+ \|MAX8645YETI	MAXIM	N/a	60	avai	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN
MAX8645YETI+T	MAXIM	N/a	2500	avai	1x/1.5x/2x White LED Charge Pumps with Two LDOs in 4mm x 4mm TQFN