MAX1531 Maxim Integrated Products, MAX1531 Datasheet - Page 10

• Manufacturer Part Number: MAX1531
• Description: (MAX1530 / MAX1531) Multiple-Output Power-Supply Controllers for LCD Monitors
• Manufacturer: Maxim Integrated Products

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4
Multiple-Output Power-Supply Controllers for
LCD Monitors
(Circuit of Figure 1; including R5, R6, and D2; T
10
5–10, 18, 19
MAX1530
______________________________________________________________________________________
11
1
2
3
4
PIN
-0.2
-0.4
-0.6
-0.8
-1.0
0
0
MAX1531
LR5 NORMALIZED LOAD REGULATION
11
—
1
2
3
4
10
LOAD CURRENT (mA)
20
NAME
RSTIN
DRV2
DRV3
FBL2
FBL3
N. C.
30
Gamma Linear Regulator (LR2) Base Drive. Open drain of an internal N-channel MOSFET.
Connect DRV2 to the base of an external PNP pass transistor to form a positive linear
regulator. (See the Pass Transistor Selection section.)
Gamma Linear Regulator (LR2) Feedback Input. FBL2 regulates at 1.245V nominal.
Connect FBL2 to the center tap of a resistive voltage-divider between the LR2 output and
AGND to set the output voltage. Place the divider close to the FBL2 pin.
Gate-On Linear Regulator (LR3) Feedback Input. FBL3 regulates at 1.245V nominal.
Connect FBL3 to the center tap of a resistive voltage-divider between the LR3 output and
AGND to set the output voltage. Place the divider close to the FBL3 pin.
Gate-On Linear Regulator (LR3) Base Drive. Open drain of an internal N-channel MOSFET.
Connect DRV3 to the base of an external PNP pass transistor to form a positive linear
regulator. (See the Pass Transistor Selection section.)
No Connection. Not internally connected.
Adjustable Reset Input. RESET asserts low when the monitored voltage is less than the
reset trip threshold. RESET goes to a high-impedance state only after the monitored
voltage remains above the reset trip threshold for the duration of the reset timeout period.
Connect RSTIN to the center tap of a resistive voltage-divider between the monitored
output voltage and AGND to set the reset trip threshold. The internal RSTIN threshold of
90% of 1.238V allows direct connection of RSTIN to any of the device’s positive feedback
pins.
40
A
Typical Operating Characteristics (continued)
= +25°C, unless otherwise noted.)
50
FUNCTION
-0.2
1.0
0.8
0.6
0.4
0.2
0
-25
LR5 NORMALIZED LINE REGULATION
20mA LOAD CURRENT
-21
INPUT VOLTAGE (V)
-17
Pin Description
-13
-9