Rainbow-electronics MAX786 Bedienungsanleitung PDF herunterladen (Seite 3)

MAX786

Dual-Output Power-Supply

Controller for Notebook Computers

_________________________________________________________________________________________________

Note 1: Since the reference uses VL as its supply, its V+ line regulation error is insignificant.

Note 2: The main switching outputs track the reference voltage. Loading the reference reduces the main outputs slightly according

to the closed-loop gain (AV

) and the reference voltage load-regulation error. AV

for the +3.3V supply is unity gain.

for the +5V supply is 1.54.

PARAMETER CONDITIONS MIN TYP MAX UNITS

Q1, Q2 Source Current VH = 15V, V

OUT

= 2.5V 12 20 30 µA

Q1, Q2 Sink Current VH = 15V, V

OUT

= 2.5V 200 500 1000 µA

Q1, Q2 Output High Voltage I

SOURCE

= 5µA, VH = 3V VH -0.5 V

Q1, Q2 Output Low Voltage I

SINK

= 20µA, VH = 3V 0.4 V

Quiescent VH Current VH = 18V, D1 = D2 = 5V, no external load 4 10 µA

OSCILLATOR AND INPUTS/OUTPUTS

Oscillator Frequency

SYNC = 3.3V 270 300 330

kHz

SYNC = 0V, 5V 170 200 230

SYNC High Pulse Width 200 ns

SYNC Low Pulse Width 200 ns

SYNC Rise/Fall Time Not tested 200 ns

Oscillator SYNC Range 240 350 kHz

Maximum Duty Cycle

SYNC = 3.3V 89 92

SYNC = 0V or 5V 92 95

Input Low Voltage

SHDN

, ON3, ON5, SYNC 0.8 V

Input High Voltage

SHDN

, ON3, ON5 2.4

SYNC VL -0.5

Input Current

SHDN

, ON3, ON5 V

= 0V, 5V ±1 µA

DL3/DL5 Sink/Source Current V

OUT

= 2V 1 A

DH3/DH5 Sink/Source Current BST3-LX3 = BST5-LX5 = 4.5V, V

OUT

= 2V 1 A

DL3/DL5 On-Resistance High or low 7 Ω

DH3/DH5 On-Resistance High or low, BST3-LX3 = BST5-LX5 = 4.5V 7 Ω

ELECTRICAL CHARACTERISTICS (continued)

(V+ = 15V, GND = PGND = 0V, I

= I

REF

= 0mA,

SHDN

= ON3 = ON5 = 5V, other digital input levels are 0V or +5V,

= T

MIN

to T

MAX

, unless otherwise noted.)

1 2 3 4 5 6 7 8 ... 19 20

Dual-Output Power-Supply 1

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