Rainbow-electronics MAX1627 Manual do Utilizador descarregar pdf (Página 4)

MAX1626/MAX1627

5V/3.3V or Adjustable, 100% Duty-Cycle,

High-Efficiency, Step-Down DC-DC Controllers

4 _______________________________________________________________________________________

____________________________Typical Operating Characteristics (continued)

(Circuit of Figure 1, T

= +25°C, unless otherwise noted.)

-60

-40

MAX1626 SHUTDOWN CURRENT

vs. TEMPERATURE

MAX1626-04

TEMPERATURE (°C)

SHUTDOWN CURRENT (µA)

0.1

0.3

0.2

0.5

0.4

0.6

0.7

0.8

-20 0 20

60 80 100 120

140

APPLICATION CIRCUIT

SHUTDOWN CURRENT:

A: V+ = +15V

B: V+ = +10V

C: V+ = +4V

MAX1626 SHUTDOWN

CURRENT:

D: V+ = +16V

E: V+ = +4V



400

0 2000 4000

EXT RISE AND FALL TIMES

vs. CAPACITANCE

100

300

250

350

MAX1626-10

CAPACITANCE (pF)

RISE

AND t

FALL

(ns)

200

150

RISE

, V+ = +15V

FALL

, V+ = +5V

RISE

, V+ = +5V

FALL

, V+ = +15V

-60 -40 -20 40 60 140

EXT RISE AND FALL TIMES

vs. TEMPERATURE

MAX1626-09

TEMPERATURE (°C)

RISE

AND t

FALL

(ns)

20 80

100 120

FALL

, V+ = +5V

EXT

= 1nF

3/5 = 0V

OUT = 50kHz, 0.3Vp-p

3.3V

RISE

, V+ = +5V

RISE

, t

FALL

, V+ = +15V

-60

-40

MAX1626

V+ QUIESCENT CURRENT

vs. TEMPERATURE

MAX1626-01

TEMPERATURE (°C)

(µA)

-20 0 20

60 80 100 120

140

3/5 = 0V

OUT FORCED TO 3.4V

V+ = +16V

V+ = +10V

V+ = +4V

012345

MAX1626 EXT OFF TIME

vs. OUTPUT VOLTAGE

MAX1626-02

OUTPUT VOLTAGE (V)

EXT OFF TIME (µs)

V+ = +5V

3/5 = GND

3/5 = V+

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4

MAX1627 EXT OFF TIME

vs. FB PIN VOLTAGE

MAX1626-03

FB PIN VOLTAGE (V)

EXT OFF TIME (µs)

V+ = +5V

115

-60 -40 -20 0 20 40 60 80 100 120 140

CS TRIP LEVEL vs. TEMPERATURE

105

110

MAX1626-12

TEMPERATURE (°C)

CS TRIP LEVEL (mV)

100

OUT = 0V

1 2 3 4 5 6 7 8 9 ... 15 16

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