Datasheet

(Circuit of Figure 1, V
IN
= 12V, V
EN
= V
SEQ
= 5V, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER CONDITIONS
MIN
TYP MAX UNITS
Comparator Bandwidth For EN, FB, FBL_ 10 kHz
Duration to Trigger Fault Latch For FB, FBL_ 51 64 77 ms
Overcurrent Protection Threshold (V
CSH
- V
CSL
) 270 300 330 mV
Overcurrent Sense Common-Mode Range V
CSH
, V
CSL
2.7 28.0 V
CSH Input Current V
CSH
= 2.7V to 28V 100 µA
CSL Input Current V
CSL
= V
CSH
= 12V -50 +50 nA
Overcurrent Sense Filter RC Time
Constant
50
µs
THERMAL PROTECTION
Thermal Shutdown Temperature rising, 15°C hysteresis 160 °C
RESET FUNCTION
RSTIN Reset Trip Level RSTIN falling, 25mV hysteresis 1.081 1.114 1.147 V
RSTIN Input Leakage Current V
RSTIN
= 1.5V -50 +50 nA
Comparator Bandwidth 10 kHz
Reset Timeout Period 102 128 154 ms
RESET Output Low Level I
RESET
= -1mA 0.4 V
RESET Output High Leakage V
RESET
= 5V 1 µA
STEP-DOWN CONTROLLER
ERROR AMPLIFIER
FB Regulation Voltage 1.223 1.238 1.253 V
Transconductance FB to COMP 70 100 140 µS
Voltage Gain FB to COMP 200 V/V
Minimum Duty Cycle 15 %
FB Input Leakage Current V
FB
= 1.5V -50 +50 nA
FB Input Common-Mode Range (Note 2) -0.1 +1.5 V
COMP Output Minimum Voltage V
FB
= 1.5V 1 V
COMP Output Maximum Voltage V
FB
= 1.175V 3 V
Current-Sense Amplier Voltage Gain V
IN
- V
LX
2.75 3.5 4.0 V/V
Current-Limit Threshold (Default Mode) PGND - LX, ILIM = VL 190 250 310 mV
Current-Limit Threshold (Adjustable Mode) PGND - LX, V
ILIM
= 1.25V 190 250 310 mV
ILIM Input Dual Mode™ Threshold 3.0
3.5
4.00 V
OSCILLATOR
Switching Frequency
FREQ = AGND 200 250 300
kHz
FREQ = VL 425 500 575
Maximum Duty Cycle
FREQ = AGND 75 80 88
%
FREQ = VL 75 80
88
MAX1530/MAX1531 Multiple-Output Power-Supply
Controllers for LCD Monitors
www.maximintegrated.com
Maxim Integrated │ 3
Electrical Characteristics (continued)