Rainbow-electronics MAX889 Manual do Utilizador descarregar pdf (Página 3)

MAX889

High-Frequency, Regulated,

200mA, Inverting Charge Pump

_______________________________________________________________________________________ 3

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

ELECTRICAL CHARACTERISTICS

= V

SHDN

= +5V, capacitors from Table 1, T

= -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

SYMBOL

CONDITIONS

MIN MAX

UNITS

Supply Voltage Range V

LOAD

= 100Ω 2.7

5.5

Output Voltage Range V

OUT

LOAD

= 100Ω

-2.5 -V

OUT(MAX)1

= 5V, V

OUT

= -3.3V

200

Maximum Output Current

OUT(MAX)2

= 3.3V, V

OUT

= -2.5V

145

MAX889R 12

MAX889S 24

Quiescent Supply

Current (Free-Run Mode)

(

FREE-RUN

)

No load, V

MAX889T 48

MAX889R 7

MAX889S 12

Quiescent Supply

Current (Regulated Mode)

(

REGULATED

)

No load, V

OUT

regulated to

-3.3V

MAX889T 22

Shutdown Supply Current I

SHDN

= 0 50 µA

Open-Loop Output

Resistance (Free-Run Mode)

= V

4.5

Ω

SHDN FB Input Bias Current ±1 µA

FB Input Offset Voltage I

LOAD

= 0

±35

IN Undervoltage Lockout

Threshold

rising (30mV hysteresis) 2.3

2.6

SHDN Logic High V

0.7 x V

SHDN Logic Low V

= +2.7V to +5.5V

0.3 x V

MAX889R

0.375

0.62

MAX889S

0.75 1.25

Switching Frequency f

OSC

MAX889T 1.5

2.5

MHz

Typical Operating Characteristics

(Circuit of Figure 1, V

= V

SHDN

= +5V, capacitors from Table 1, T

= +25°C, unless otherwise noted.)

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX889 toc01

OUTPUT LOAD CURRENT (mA)

OUTPUT VOLTAGE (V)

-3.33

-3.32

-3.31

-3.30

-3.29

-3.28

-3.27

-3.26

-3.25

0 200 400 600 800

MAX889T

MAX889S

MAX889R

OUTPUT RIPPLE

vs. LOAD CURRENT vs. C

OUT

MAX889 toc02

LOAD CURRENT (mA)

OUTPUT RIPPLE (mV)

0 150 20050 100 250 300 350

OUT

= 22

OUT

= 47µF

OUT

= 10

MAX889S

OUTPUT RIPPLE

vs. LOAD CURRENT vs. C

OUT

MAX889 toc03

LOAD CURRENT (mA)

OUTPUT RIPPLE (mV)

0 150 20050 100 250 300 350

OUT

= 4.7

OUT

= 22

OUT

= 10

1 2 3 4 5 6 7 8

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