MAX8570 datasheet(3/11 Pages) MAXIM

3 / 11 page

High-Efficiency LCD Boost

with True Shutdown

_______________________________________________________________________________________

EFFICIENCY vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

5.1

4.7

4.3

3.9

3.5

3.1

100

2.7

5.5

L1 = TOKO A914BYW-470M

µH, 1mA LOAD

µH, 5mA LOAD

L1 = MURATA LQH32CN220K23

µH, 5mA LOAD

µH, 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)

SUPPLY VOLTAGE (V)

5.1

4.7

3.9

4.3

3.5

3.1

17.6

17.7

17.8

17.9

18.0

18.1

18.2

18.3

18.4

18.5

17.5

2.7

5.5

L1 = MURATA LQH32CN220K23

R1 = 3.9M

Ω, R2 = 287kΩ

5mA LOAD

1mA LOAD

OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (FIGURE 3, MAX8573)

SUPPLY VOLTAGE (V)

5.1

4.7

3.9

4.3

3.5

3.1

14.6

14.7

14.8

14.9

15.0

15.1

15.2

15.3

15.4

15.5

14.5

2.7

5.5

L1 = MURATA LQH32CN220K23

5mA LOAD

1mA LOAD

OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE (MAX8574)

SUPPLY VOLTAGE (V)

4.6

4.3

4.0

3.7

3.4

17.2

18.2

18.0

17.8

17.6

17.4

18.4

18.6

18.8

19.0

17.0

3.1

4.9

L1 = TOKO S1024-100M

R1 = 1.1M

Ω, R2 = 75kΩ, C4 = 4.7pF

5mA LOAD

20mA LOAD

OUTPUT VOLTAGE

vs. LOAD CURRENT

LOAD CURRENT (mA)

17.6

17.8

18.0

18.2

18.4

18.6

18.8

19.0

17.4

025

L1 = MURATA LQH32CN220K23

R1 = 3.9M

Ω, R2 = 287kΩ, C4 = 10pF

MAX8570

MAX8571

MAX8574, R1 = 1.1M

Ω, R2 = 75kΩ, C4 = 4.7pF

OUTPUT VOLTAGE vs. TEMPERATURE

TEMPERATURE (

°C)

-15

17.7

17.8

17.9

18.0

18.1

18.2

18.3

18.4

17.6

-40

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 = V SHDN = 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)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

VCC = 3.6V, VSW = 0V, VFB = 0V, ICC (peak)

0.45

0.75

1.10

SW PMOS Current Limit

VCC = 3.6V, VSW = 0V, VFB = 0V, ICC (average)

0.15

0.30

0.60

SW PMOS On-Resistance

VCC = 2.7V, VFB = 0V, ISW = 100mA

1.5

2.5

Ω

TA = +25

°C

0.01

SW PMOS Leakage Current

SW = GND, VCC = 5.5V, VFB = 0V

TA = -40

°C to +85°C

0.02

µA

SW Soft-Start Time

VCC = 2.7V, CSW = 4.7µF

0.2

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