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MAX8570EUT+TMAXIMN/a2567avaiHigh-Efficiency LCD Boost with True Shutdown
MAX8574EUT+N/AN/a2500avaiHigh-Efficiency LCD Boost with True Shutdown


MAX8570EUT+T ,High-Efficiency LCD Boost with True ShutdownApplicationsLCD Bias GeneratorsPART CURRENT LIMIT OUTPUT VOLTAGEPolymer LEDs (OLED)MAX8570 110mA Ad ..
MAX8574EUT+ ,High-Efficiency LCD Boost with True ShutdownELECTRICAL CHARACTERISTICS(V = V = 3.6V, SW open, V = 1.3V (MAX8570/MAX8571/MAX8574) or V = 16V (MA ..
MAX8576EUB ,3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down ControllersELECTRICAL CHARACTERISTICS (continued)(V = 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX ..
MAX8576EUB+ ,3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down ControllersELECTRICAL CHARACTERISTICS(V = 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX8576/MAX8577 ..
MAX8576EUB+T ,3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down ControllersFeaturesThe MAX8576–MAX8579 synchronous PWM buck con-♦ 3V to 28V Supply Voltage Rangetrollers use a ..
MAX8577EUB ,3V to 28V Input, Low-Cost, Hysteretic Synchronous Step-Down ControllersELECTRICAL CHARACTERISTICS (continued)(V = 12V (MAX8576/MAX8577 only), 4.7µF capacitor from VL (MAX ..
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MAX8570EUT+T-MAX8574EUT+
High-Efficiency LCD Boost with True Shutdown
General Description
The MAX8570 family of LCD step-up converters usesan internal n-channel switch and an internal p-channel
output isolation switch. These converters operate froma 2.7V to 5.5V supply voltage and deliver up to 28V at
the output.
A unique control scheme provides the highest efficien-
cy over a wide range of load conditions. The internal MOSFET switch reduces external component count and
a high switching frequency (up to 800kHz) allows for
tiny surface-mount components. Three current-limitoptions are available. The MAX8570 and MAX8572 use
a 110mA current limit to reduce ripple and componentsize in low-current applications. For high-power require-
ments, the MAX8574 and MAX8575 use a 500mA cur-
rent limit and supply up to 20mA at 20V. The MAX8571and MAX8573 use a 250mA current limit for a compro-
mise between ripple and power. Built-in safety featuresprotect the internal switch and down-stream compo-
nents from fault conditions.
Additional features include a low quiescent current and
a True Shutdown™mode to save power. The MAX8570/MAX8571/MAX8574 allow the user to set the output
voltage between 3V and 28V, and the MAX8572/
MAX8573/MAX8575 have a preset 15V output. Thesestep-up converters are ideal for small LCD panels with
low current requirements, but can also be used in otherapplications. The MAX8571 evaluation kit is available to
help reduce design time.
Applications

LCD Bias Generators
Polymer LEDs (OLED)
Cellular or Cordless Phones
Palmtop Computers
Personal Digital Assistants (PDAs)
Organizers
Handy Terminals
Features
15V or Adjustable Output Voltage Up to 28VSafety Features Protect Against Output Faults20mA at 20V from a Single Li+ BatteryTrue Shutdown87% EfficiencyUp to 800kHz Switching FrequencySmall, 6-Pin SOT23 and µDFN (MAX8570 Only)
Packages
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
Ordering Information

19-3329; Rev 3; 3/10
EVALUATION KIT
AVAILABLE
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX8570ELT+T
-40°C to +85°C6L μDFNACW
MAX8570EUT+T-40°C to +85°C6 SOT23ABTJ
MAX8571EUT+T
-40°C to +85°C6 SOT23ABTK
MAX8572EUT+T
-40°C to +85°C6 SOT23ABTL
MAX8573EUT+T
-40°C to +85°C6 SOT23ABTM
MAX8574EUT+T
-40°C to +85°C6 SOT23ABTN
MAX8575EUT+T
-40°C to +85°C6 SOT23ABTO
GND
6VCC
5SW
MAX8570
MAX8571
MAX8574
SOT23

TOP VIEWSHDN
Pin Configurations
PARTCURRENT LIMITOUTPUT VOLTAGE
MAX8570
110mAAdjustable
MAX8571
250mAAdjustable
MAX8572
110mA15V
MAX8573
250mA15V
MAX8574
500mAAdjustable
MAX8575
500mA15V
Selector Guide

MAX8572
MAX8573
MAX8575
VCC
OUT
GNDON
OFF
VCC = 2.7V TO 5.5V
VOUT = VCC TO 28V
SHDN
Typical Operating Circuit

+Denotes a lead(Pb)-free RoHS-compliant package.
T = Tape and reel.
Pin Configurations continued at end of data sheet.
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= VSHDN= 3.6V, SW open, VFB= 1.3V (MAX8570/MAX8571/MAX8574) or VOUT= 16V (MAX8572/MAX8573/MAX8575), 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.
VCC, SHDNto GND..................................................-0.3V to +6V
SW to GND.................................................-0.3V to (VCC+ 0.3V)
FB to GND (MAX8570/MAX8571/
MAX8574)...............................................-0.3V to (VCC+ 0.3V)
OUT to GND (MAX8572/MAX8573/MAX8575).......-0.3V to +30V
LX to GND..............................................................-0.3V to +30V
ILX, ICC..............................................................................600mA
Continuous Power Dissipation (TA= +70°C)
μDFN (derate 4.5mW/°C above +70°C)....................357.8mW
SOT23-6 (derate 8.7mW/°C above +70°C)...............695.7mW
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
Soldering Temperature (reflow).......................................+260°C
PARAMETERCONDITIONSMINTYPMAXUNITS

VCC Input Voltage Range2.705.50V
VCC Undervoltage LockoutVCC rising, 50mV typical hysteresis2.332.52.65V
VCC Supply Current2535μA
TA = +25°C0.051VCC Shutdown CurrentSHDN = GND, VCC = 5.5VTA = -40°C to +85°C0.05μA
Line RegulationCircuit of Figure 3, VOUT = 15V, ILOAD = 5mA,
VCC = 2.7V to 5.5V0.1%/V
Load RegulationCircuit of Figure 3, VOUT = 15V, ILOAD = 0 to 5mA0.1%/mA
TA = 0°C to +85°C1.2161.2261.236FB Regulation VoltageTA = -40°C to +85°C1.21371.2383V
FB Input Bias Current-50-4+50nA
TA = 0°C to +85°C14.851515.15OUT Regulation VoltageTA = -40°C to +85°C14.81315.187V
OUT Input Bias CurrentVOUT = 15V2.44.4μA
LX Voltage Range28V
MAX8571/MAX85730.2170.2410.267
MAX8570/MAX85720.0880.1010.108LX Switch Current Limit (Note 2)
MAX8574/MAX85750.4250.4840.540
MAX8571/MAX8573/MAX8574/MAX8575, ILX = 100mA0.91.5LX On-ResistanceMAX8570/MAX8572, ILX = 50mA1.52.4Ω
TA = +25°C0.012LX Leakage CurrentVLX = 28VTA = -40°C to +85°C0.05μA
Maximum LX On-Time81114μs
VFB > 1V or VOUT > 12.2V0.811.2Minimum LX Off-TimeVFB = 0.25V or VOUT = 3.4V4.056.0μs
Current-Limit Propagation Delay55ns
SHDN Low Level (VIL)2.7V ≤ VCC ≤ 5.5V0.7V
4.2V ≤ VCC ≤ 5.5V1.5SHDN High Level (VIH)2.7V ≤ VCC < 4.2V1.4V
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
EFFICIENCY vs. SUPPLY VOLTAGE

MAX8570/71/73/74/75 toc06
EFFICIENCY (%)
L1 = TOKO A914BYW-470M
47μH, 1mA LOAD
47μH, 5mA LOAD
L1 = MURATA LQH32CN220K23
22μH, 5mA LOAD22μH, 1mA LOAD
Typical Operating Characteristics

(MAX8571, VCC= 3.6V, VOUT= 18V, Circuit of Figure 2, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8571)

MAX8570/71/73/74/75 toc01
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
L1 = MURATA LQH32CN220K23
R1 = 3.9MΩ, R2 = 287kΩ
5mA LOAD
1mA LOAD
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (FIGURE 3, MAX8573)

MAX8570/71/73/74/75 toc02
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
L1 = MURATA LQH32CN220K23
5mA LOAD
1mA LOAD
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE (MAX8574)

MAX8570/71/73/74/75 toc03
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
L1 = TOKO S1024-100M
R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
5mA LOAD
20mA LOAD
OUTPUT VOLTAGE
vs. LOAD CURRENT

MAX8570/71/73/74/75 toc04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)15510
L1 = MURATA LQH32CN220K23
R1 = 3.9MΩ, R2 = 287kΩ, C4 = 10pF
MAX8570MAX8571
MAX8574, R1 = 1.1MΩ, R2 = 75kΩ, C4 = 4.7pF
OUTPUT VOLTAGE vs. TEMPERATURE

MAX8570/71/73/74/75 toc05
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)3510-15
1mA LOAD
Note 1:
Parameters are production tested at TA= +25°C. Limits over temperature are guaranteed by design.
Note 2:
Specified currents are measured at DC. Actual LX current limits are slightly higher in circuit due to current-limit comparator
delay. Actual currents (with 2μH) are 110mA (MAX8570/MAX8572), 250mA (MAX8571/MAX8573), and 500mA
(MAX8574/MAX8575).
ELECTRICAL CHARACTERISTICS (continued)

(VCC= VSHDN= 3.6V, SW open, VFB= 1.3V (MAX8570/MAX8571/MAX8574) or VOUT= 16V (MAX8572/MAX8573/MAX8575), TA=
-40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS

VCC = 3.6V, VSW = 0V, VFB = 0V, ICC (peak)0.450.751.10SW PMOS Current LimitVCC = 3.6V, VSW = 0V, VFB = 0V, ICC (average)0.150.300.60A
SW PMOS On-ResistanceVCC = 2.7V, VFB = 0V, ISW = 100mA1.52.5Ω
TA = +25°C0.011SW PMOS Leakage CurrentSW = GND, VCC = 5.5V, VFB = 0VTA = -40°C to +85°C0.02μA
SW Soft-Start Time VCC = 2.7V, CSW = 4.7μF0.21ms
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
EFFICIENCY vs. BATTERY VOLTAGE
(FIGURE 4)

MAX8570/71/73/74/75 toc07
BATTERY VOLTAGE (V)
EFFICIENCY (%)8642
L1 = MURATA LQH32CN220K23
5mA LOAD
1mA LOAD
VCC = 3.6V
EFFICIENCY vs. LOAD CURRENT
WITH 22μH INDUCTOR

MAX8570/71/73/74/75 toc08
LOAD CURRENT (mA)
EFFICIENCY (%)1
MAX8574, TOKO A914BYW-220M
MAX8571, MURATA LQH32CN220K23
MAX8570, MURATA LQH32CN220K23
EFFICIENCY vs. LOAD CURRENT
WITH 47μH INDUCTOR

MAX8570/71/73/74/75 toc09
LOAD CURRENT (mA)
EFFICIENCY (%)1
MAX8570, L1 = MURATA LQH32CN470K23
MAX8571, L1 = TOKO A914BYW-470M
PEAK INDUCTOR CURRENT LIMIT
vs. SUPPLY VOLTAGE

MAX8570/71/73/74/75 toc10
SUPPLY VOLTAGE (V)
CURRENT LIMIT (mA)
MAX8574
MAX8571
MAX8570
SUPPLY CURRENT vs. LOAD CURRENT

MAX8570/71/73/74/75 toc11
LOAD CURRENT (mA)
SUPPLY CURRENT (mA)5
L1 = MURATA LQH32CN220K23
NO-LOAD CURRENT vs. SUPPLY VOLTAGE

MAX8570/71/73/74/75 toc12
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (4123
R1 = 3.9MΩ
R2 = 287kΩR1 = 7.87MΩ
R2 = 576kΩ
MAX8573,
FIGURE 3
L1 = MURATA
LQH32CN220K23NO SWITCHING
LINE TRANSIENT 3V TO 5.5V (MAX8571)

MAX8570/71/73/74/75 toc13
100μs/div
VCC
VOUT
200mV/div
(AC-COUPLED)
2V/div
3.6kΩ LOAD, R1 = 3.9MΩ, R2 = 287kΩ
LINE TRANSIENT 3V TO 5.5V
(FIGURE 3, MAX8573)

MAX8570/71/73/74/75 toc14
100μs/div
VCC
VOUT200mV/div
(AC-COUPLED)
2V/div
3kΩ LOAD
Typical Operating Characteristics (continued)

(MAX8571, VCC= 3.6V, VOUT= 18V, Circuit of Figure 2, TA= +25°C, unless otherwise noted.)
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown
PIN
MAX8570
(µDFN)
MAX8570/
MAX8571/
MAX8574
(SOT23)
MAX8572/
MAX8573/
MAX8575
(SOT23)
NAMEFUNCTION
—FBFeedback for Setting the Output Voltage. Connect FB to the center of a resistor
voltage-divider from the output to GND to set positive output voltages.—1OUT
Output. The output voltage is preset to 15V. Connect a 1μF ceramic capacitor
from OUT to GND. In shutdown, OUT is pulled to GND by an internal 7.5MΩ
resistor.22GNDGround3SHDNShutdown Input. A logic-low at SHDN places the part in low-power shutdown
mode. Pull SHDN high or connect to VCC for normal operation.44LXInductor Switching Connection5SW
Isolation Switch Output. Internally connected to the drain of a p-channel
MOSFET used to isolate the output from the input during shutdown. Connect a
4.7μF ceramic capacitor from SW to GND. If True Shutdown is not required, SW
can be left open with the input supply connected directly to the inductor.6VCCInput Voltage Supply. Connect a 2.7V to 5.5V input supply to VCC. Connect a
1μF ceramic capacitor from VCC to GND.
Pin Description
LOAD TRANSIENT

MAX8570/71/73/74/75 toc15
100μs/div
VOUT
IOUT
100mV/div
(AC-COUPLED)
5mA/div
STARTUP AND SHUTDOWN WAVEFORMS

MAX8570/71/73/74/75 toc16
400μs/div
VOUT
ILX
5V/div
10V/div
200mA/div
1.8Ω LOAD
VSHDN
BOOST SOFT-START
SW TURN-ON
Typical Operating Characteristics (continued)

(MAX8571, VCC= 3.6V, VOUT= 18V, Circuit of Figure 2, TA= +25°C, unless otherwise noted.)
MAX8570–MAX8575
High-Efficiency LCD Boost
with True Shutdown

MAX8570–
MAX8575
ILIM
THERMAL
SHUTDOWNOUT
(MAX8570/MAX8571/
MAX8574 ONLY)
GND
(MAX8572/MAX8573/
MAX8575 ONLY)VCC
1.226V
CONTROL
LOGIC
SHDN
Figure 1. Functional Diagram
MAX8570
MAX8571
MAX8574
VCC
GNDON
OFF
VCC = 2.7V TO 5.5V
VOUT = VBATT TO 28V
4.7μF
22μH
1μF
SHDN
1μFC4
10pF
VBATT = 0.8V TO 28V
Figure 4. Using a Separate Input Supply for the Inductor
MAX8570
MAX8571
MAX8574
VCC
GNDON
OFF
VCC = 2.7V TO 5.5V
+VOUT
-VOUT
4.7μF
22μH
1μF
SHDN
1μF
1μF
10pF
0.1μF
Figure 5. Negative Output Voltage for LCD Bias
MAX8570
MAX8571
MAX8574
VCC
GNDON
OFF
VCC = 2.7V TO 5.5V
VOUT = VCC TO 28V
4.7μF
22μH
1μF
SHDN
1μFC4
10pF
Figure 2. Typical Application Circuit with Adjustable Output
Voltage
MAX8572
MAX8573
MAX8575
VCC
OUT
GNDON
OFF
VCC = 2.7V TO 5.5V
VOUT = 15V
4.7μF
22μH
1μF
SHDN
1μF
Figure 3. Typical Application Circuit with 15V Preset Output
Voltage
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