Datasheet

MAX17113
Low-Cost, Multiple-Output
Power Supply for LCD TVs
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PARAMETER CONDITIONS MIN TYP MAX UNITS
REFERENCE
REF Output Voltage No external load 1.235 1.250 1.265 V
REF Load Regulation 0 < I
LOAD
< 50μA 10 mV
REF Sink Current In regulation 10 μA
RE F U nd er vol tag e- Lockout Thr eshol d Rising edge; 25mV typical hysteresis 1.0 1.2 V
STEP-DOWN REGULATOR
0°C < T
A
< +85°C 3.25 3.30 3.35
OUT Voltage in Fixed Mode
FB2 = AGND, no load
(Note 1)
T
A
= +25°C 3.267 3.333
V
0°C < T
A
< +85°C 1.23 1.25 1.27
FB2 Voltage in Adjustable Mode
V
OUT
= 2.5V, no load
(Note 1)
T
A
= +25°C 1.2375 1.2625
V
FB2 Adjustable-Mode
Threshold Voltage
Dual-mode comparator 0.10 0.15 0.20 V
Output-Voltage Adjust Range Step-down output 1.5 5.0 V
FB2 Fault Trip Level Falling edge 0.94 1.00 1.06 V
FB2 Input Bias Current V
FB2
= 1.5V, T
A
= +25°C 50 125 200 nA
DC Load Regulation 0.4A < I
LOAD
< 2A 0.5 %
DC Line Regulation No load, 10.8V < V
IN2
< 13.2V 0.05 %/V
LX2-to-IN2 nMOS Switch
On-Resistance
100 200 mΩ
LX2-to-CPGND nMOS Switch
On-Resistance
71225Ω
BST-to-VL pMOS Switch
On-Resistance
71225Ω
Low-Frequency Operation
OUT Threshold
Step-down only 0.8 V
FSEL = VIN 100
Low-Frequency Operation
Switching Frequency
FSEL = AGND 75
kHz
LX2 Positive Current Limit 2.50 3 3.50 A
Soft-Start Period 3.3 ms
Soft-Start Step Size
V
REF
/
128
V
Maximum Duty Factor 65 75 90 %
POWER-GOOD
FB2 Power-Good Threshold FB2 rising 0.94 1.00 1.06 V
FB2 Threshold Hysteresis 12 mV
PGOOD Output Low Voltage I
PGOOD
= 1mA 0.1 0.3 V
PGOOD Leakage Current V
PGOOD
= 3V, T
A
= +25°C 1 μA
CRST Charge Current V
CRST
= 1V 0.8 1.0 1.2 μA
CRST Voltage Threshold 1.2 1.25 1.3 V
CRST Pulldown Resistance V
CRST
= 1V 150 300 Ω
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VIN
= V
IN2
= 12V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)