Rainbow-electronics MAX889 Manual do Utilizador descarregar pdf (Página 2)

MAX889

High-Frequency, Regulated,

200mA, Inverting Charge Pump

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

SHDN

= +5V, capacitors from Table 1, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

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 to GND .................................................................-0.3V to +6V

FB, SHDN, CAP+ to GND............................-0.3V to (V

+ 0.3V)

AGND to GND .......................................................-0.3V to +0.3V

OUT to GND .............................................................-6V to +0.3V

CAP- to GND ............................................(V

OUT

- 0.3V) to +0.3V

Continuous Output Current ...............................................250mA

Output Short-Circuit Duration ........................................Indefinite

Continuous Power Dissipation (T

= +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW

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

PARAMETER

SYMBOL

CONDITIONS

MIN TYP 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 6 12

MAX889S 12 24

Quiescent Supply

Current (Free-Run Mode)

(

FREE-RUN

)

No load, V

MAX889T 24 48

MAX889R 3.3 7

MAX889S 5.5 12

Quiescent Supply

Current (Regulated Mode)

(

REGULATED

)

No load, V

OUT

regulated to

-3.3V

MAX889T 11 22

Shutdown Supply Current I

SHDN

= 0 0.1 50 µA

Open-Loop Output

Resistance (Free-Run Mode)

= V

2.0

4.5

Ω

Output Resistance

O(REG1)

OUT

regulated to -3.3V

0.05

Ω

SHDN, FB Input Bias Current ±1 µA

FB Input Offset Voltage I

LOAD

= 0 ±3

±35

Load Regulation I

OUT

= 0 to 200mA 10 mV

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

0.5

0.62

MAX889S

0.75

1.25

Switching Frequency f

OSC

MAX889T 1.5 2

2.5

MHz

Thermal Shutdown Threshold

Junction temperature rising

(15°C hysteresis)

160 °C

1 2 3 4 5 6 7 8

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