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MAX1577ZETA+ ,1.2A White LED Regulating Charge Pump for Camera Flashes and Movie LightsApplicationsWhite LED Flashes, Strobes, and Movie LightsOrdering InformationLCD BacklightingPIN- TO ..
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MAX4242 ,Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op AmpsApplicationsMAX4242EUA -40°C to +85°C 8 µMAX —Two-Cell Battery- Strain GaugesMAX4242ESA -40°C to +8 ..
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MAX4242ESA+ ,Single/Dual/Quad, +1.8V/10µA, SOT23, Beyond-the-Rails Op Ampsapplications.PART TEMP RANGEPACKAGE MARKThe MAX4240 is offered in a space-saving 5-pinSOT23 package ..
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MAX1577ZETA+
1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights
General Description
The MAX1577Y/MAX1577Z charge pumps drive white
LEDs, including camera strobes, with regulated current
up to 1.2A (guaranteed to 800mA). The very low open-
loop output resistance allows high flash brightness,
even from a low battery input voltage. The adaptive
1x/2x regulating charge-pump operation provides high
efficiency (up to 92%) while in movie mode or back-
lighting. Fast (1MHz) switching allows the use of tiny
external components.
The MAX1577Y/MAX1577Z use an external resistor to
set the full-scale LED current. Two enable inputs (EN1
and EN2) provide simple on/off control and LED current
of 20%, 33%, or 100% full scale. If there is less than
24mV across the external resistor, the output voltage is
regulated. The MAX1577Z has fixed 5.1V output-volt-
age regulation, while the MAX1577Y has logic-con-
trolled output voltage of 3.4V, 4.6V, or 5.1V for
backlighting, keyboard, and RGB applications.
The MAX1577Y/MAX1577Z are available in an 8-pin,
3mm x 3mm TDFN package (0.8mm max height).
Applications
White LED Flashes, Strobes, and Movie Lights
LCD Backlighting
Camera Phones, Cell Phones, and Smart Phones
PDAs, Digital Cameras, and Camcorders
FeaturesUp to 1.2A Output Drive Capability (800mA
Guaranteed)Up to 92% PLED/ PBATTEfficiency for Movie
ModeFlexible Brightness Control
Two-Bit Logic for 100%, 33%, 20%, and Off
PWM for 20% to 100%3% Current Regulation Over Line and
TemperatureCurrent or Voltage Regulation for Flash and
Backlighting (MAX1577Y)Current Regulation for Flash (MAX1577Z)Low Ripple and EMI 2.7V to 5.5V Supply Voltage RangeSoft-Start Limits Inrush CurrentOutput-Voltage Regulation ModeThermal-Shutdown Protection8-Pin 3mm x 3mm TDFN Package
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
MAX1577Y
MAX1577Z
OUT
GND
EN2
EN1TDFN
TOP VIEW
Pin Configuration
Ordering Information
MAX1577Z
1μF OR 2.2μF
5.3V OVP
VOUT - (300mV OR
100mV OR 60mV)
UP TO 1.2A2.7V TO 5.5V
4.7μF10μF
100%,
33%, 20%,
AND
SHUTDOWNCN
EN1OUT
GND
EN2
Typical Operating Circuit
19-3461; Rev 0; 11/04
EVALUATION KIT AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX1577YETA-40°C to +85°C8 TDFN
(T833-2)AMG
MAX1577ZETA-40°C to +85°C8 TDFN
(T833-2)AMQ
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 3.6V, circuit of Figure 2, EN1 = EN2 = IN, RCS= 60Ω, CIN= 4.7µF, C1 = 2.2µF, COUT= 10µF, 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.
IN, OUT, EN1, EN2 to GND...................................-0.3V to +6.0V
OUT to GND During Shutdown....................-0.3V to (VIN+ 0.3V)
OUT to CS.............................................................-0.6V to +0.6V
CS to GND................................................-0.3V to (VOUT+ 0.3V)
CN to GND...................................................-0.3V to (VIN+ 0.3V)
CP to GND .....-0.3V to the Greater of (VOUT+ 1V) or (VIN+ 1V)
OUT Short Circuit to GND..........................................Continuous
Continuous Power Dissipation (TA= +70°C)
8-Pin TDFN (derate 18.2mW/°C above +70°C)..........1455mW
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 rising2.32.452.6V
Undervoltage-Lockout Hysteresis35mV
1MHz switching, no load5Supply Current1x LDO mode, no switching0.2250.3mA
TA = +25°C0.011Shutdown Supply CurrentEN1 = EN2 = GNDTA = +85°C0.2µA
Soft-Start Time0.5ms
OUT Overvoltage Protection5.3V
MAX1577Z, TA = +25°C,
IOUT = 100mAEN1 or EN2 = IN4.955.105.25
EN1 = GND, EN2 = IN3.173.403.60
EN1 = IN, EN2 = GND4.404.604.80
OUT Voltage Regulation Mode
MAX1577Y, TA = +25°C,
IOUT = 100mA
EN1 = EN2 = IN4.955.105.25
CS Voltage-Mode Threshold
(VOUT - VCS)24mV
EN1 = GND, EN2 = IN60
EN1 = IN, EN2 = GND100CS Regulation Voltage
(VOUT - VCS)
EN1 = EN2 = IN300
TA = +25°C-2±0.5+2CS Threshold AccuracyVIN = 2.7V to 5.5V, TA = -40°C to +85°C-3+3%
VIN = 3.1V600900Maximum OUT CurrentVLED = 4.1V, EN1 = EN2 = INVIN = 3.4V8001200mA
1x LDO mode0.6Open-Loop OUT Resistance2x mode, VIN = 3.4V23Ω
OUT Internal Pulldown in
ShutdownEN1 = EN2 = GND5kΩ
Switching Frequency0.801.01.25MHz
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
LED CURRENT vs. SUPPLY VOLTAGE
MAX1577 toc01
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
RCS = 0.27Ω
1100mA AT 3.78VF
370mA AT 3.33VF
220mA AT 3.15VF
EFFICIENCY vs. SUPPLY VOLTAGE
MAX1577 toc02
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
RCS = 0.27Ω
220mA AT 3.15VF
370mA AT 3.33VF
1100mA AT 3.78VF
BATTERY CURRENT vs. SUPPLY VOLTAGE
MAX1577 toc03
SUPPLY VOLTAGE (V)
BATTERY CURRENT (mA)
RCS = 0.27Ω
220mA AT 3.15VF
370mA AT 3.33VF
1100mA AT 3.78VF
LED CURRENT vs. SUPPLY VOLTAGE
MAX1577 toc04
SUPPLY VOLTAGE (V)
LED CURRENT (mA)
RCS = 0.39Ω
770mA AT 3.66VF
250mA AT 3.21VF
150mA AT 3.06VF
EFFICIENCY vs. SUPPLY VOLTAGE
MAX1577 toc05
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
RCS = 0.39Ω
770mA AT 3.66VF
250mA AT 3.21VF150mA AT 3.06VF
BATTERY CURRENT vs. SUPPLY VOLTAGE
MAX1577 toc06
SUPPLY VOLTAGE (V)
BATTERY CURRENT (mA)
RCS = 0.39Ω
770mA AT 3.66VF
250mA AT 3.21VF
150mA AT 3.06VF
Typical Operating Characteristics
(VIN= 3.6V, circuit of Figure 2, RCS= 0.27Ω, Luxeon LXCL-PWF1 LED, TA= +25°C, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)
(VIN= 3.6V, circuit of Figure 2, EN1 = EN2 = IN, RCS= 60Ω, CIN= 4.7µF, C1 = 2.2µF, COUT= 10µF, 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.
PARAMETERCONDITIONSMINTYPMAXUNITS
VIN = 4.2V to 5.5V1.6EN_ Logic-High VoltageVIN = 2.7V to 4.2V1.4V
EN_ Logic-Low VoltageVIN = 2.7V to 5.5V0.4V
TA = +25°C0.021Logic Input CurrentVEN_ = 0V or 5.5VTA = +85°C0.02µA
Thermal-Shutdown ThresholdTJ rising+160°C
Thermal-Shutdown Hysteresis20°C
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
LED CURRENT vs. TEMPERATURE
MAX1577 toc07
TEMPERATURE (°C)
LED CURRENT (mA)3510-15
RCS = 0.27Ω
EN1 LOW
EN2 HIGH
LED CURRENT vs. RCS
MAX1577 toc08
RCS (Ω)
LED CURRENT (A)
EN1 AND EN2 HIGH
EN1 HIGH, EN2 LOW
EN1 LOW, EN2 HIGH
TYPICAL OPERATING WAVEFORMS
IN 1x MODE
MAX1577 toc09
400ns/div
VIN
VOUT
VCS
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
TYPICAL OPERATING WAVEFORMS
IN 2x MODE
MAX1577 toc10
400ns/div
VIN
VOUT
VCS
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
50mV/div
(AC-COUPLED)
STARTUP AND SHUTDOWN RESPONSE
MAX1577 toc11
400μs/div
VEN1,
VEN2
VLED
ILED
2V/div
2V/div
0mA
500mA/div
LED CURRENT vs. PWM DUTY CYCLE
MAX1577 toc12
DUTY CYCLE (%)
LED CURRENT (mA)604020
RCS = 0.27Ω
EN1 PWM
EN2 HIGH
EFFICIENCY vs. SUPPLY VOLTAGE
WITH PWM DIMMING
MAX1577 toc13
SUPPLY VOLTAGE (V)
EFFICIENCY (%)
25%
50%
75%
RCS = 0.27Ω
EN1 PWM
EN2 HIGH
DIMMING RESPONSE
MAX1577 toc14
100μs/div
VEN1
VLED
ILED
2V/div
2V/div
0mA
500mA/div
Typical Operating Characteristics (continued)
(VIN= 3.6V, circuit of Figure 2, RCS= 0.27Ω, Luxeon LXCL-PWF1 LED, TA= +25°C, unless otherwise noted.)
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
Pin Description
PINNAMEFUNCTIONEN1Control Logic Input (see Table 1)
2CPTransfer Capacitor Positive Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from
CP to CN.
3CNTransfer Capacitor Negative Connection. Connect a 1µF capacitor (or 2.2µF for IOUT > 600mA) from
CP to CN.EN2Control Logic Input (see Table 1)GNDGround
6INInput Supply Voltage. Connect IN to a battery or supply voltage from 2.7V to 5.5V. Connect a 4.7µF
ceramic capacitor from IN to GND.
7CSCurrent-Sense Input. Connect a current-sense resistor from OUT to CS to set the output current.
Connect the anodes of the LEDs to CS and the cathodes to GND.OUTOutput. Connect a 10µF ceramic capacitor from OUT to GND. In shutdown, OUT is pulled to GND
with an internal 5kΩ resistor.
—EPExposed Pad. Connect the exposed pad to GND directly under the IC.
Table 1. Enable, Dimming, Voltage Mode, and Overvoltage Protection
VOLTAGE MODEOVPEN1EN2DIMMING LEVELCS THRESHOLD
(VOUT - VCS)MAX1577ZMAX1577YMAX1577ZMAX1577YShutdown—————20% Current60mV5.10V3.40V5.30V5.15V33% Current100mV5.10V4.60V5.30V5.17V100% Current300mV5.10V5.10V5.30V5.30V
Note:A “0” indicates EN_ is logic low or connected to GND. A “1” indicates EN_ is logic high or connected to IN.
MAX1577Y/MAX1577Z
1.2A White LED Regulating Charge Pump for
Camera Flashes and Movie Lights
MAX1577Y
MAX1577Z
MAX1577Y
ONLY
IMODE/
VMODE
MUX
CSVMODEERROR
AMP
EN1
EN2
VOUT - VCS
RCS
COUT
10μF
OUT
CIN
4.7μF
GND
1.25V
24mV
CONTROL
LDO/CHARGE PUMP
1μF*CP
2.7V TO 5.5V
*2.2μF FOR MORE THAN 600mA OUTPUT.
Figure 1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX1577ZETA+ \|MAX1577ZETA	MAXIM	N/a	57	avai	1.2A White LED Regulating Charge Pump for Camera Flashes and Movie Lights