Datasheet

MAX17014
Low-Cost Multiple-Output
Power Supply for LCD TVs
_______________________________________________________________________________________ 9
Note 2: When the inductor is in continuous conduction (EN2 = VL or heavy load), the output voltage has a DC regulation level lower than
the error comparator threshold by 50% of the output voltage ripple. In discontinuous conduction (EN2 = GND with light load), the
output voltage has a DC regulation level higher than the error comparator threshold by 50% of the output voltage ripple.
Note 3: Disables boost switching if either SUP, SWI, or OVIN exceeds the threshold. Switching resumes when no threshold is exceeded.
Note 4: Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
IN
= V
IN2
= 12V, AV
DD
= V
OVIN
= V
SUP
= 15V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless
otherwise noted.) (Note 4)
PARAMETER CONDITIONS MIN TYP MAX UNITS
M O D E V ol tag e Thr eshol d for E nab l i ng
D RN S w i tch C ontr ol i n M od e 2
GON connects to DRN, V
MODE
rising edge 1.2 1.4 V
MODE Current-Source Stop Voltage
Threshold
MODE
rising edge 2 3 V
THR-to-GON Voltage Gain 9.4 10.6 V/V
SEQUENCE CONTROL
EN1, EN2 Input Low Voltage 0.6 V
EN1, EN2 Input High Voltage 1.6 V
SWITCHING FREQUENCY SELECTION
FSEL Input Low Voltage 600kHz 0.6 V
FSEL Input High Voltage 1.2MHz 1.6 V
Typical Operating Characteristics
(Circuit of Figure 1. V
IN
= V
INL
= V
SUP
= 12V, AV
DD
= 16V, V
GON
= 34.5V, V
GOFF
= -6V, V
OUT1
= 3.3V, T
A
= +25°C, unless other-
wise noted.)
STEP-DOWN REGULATOR EFFICIENCY
vs. LOAD CURRENT
MAX17014 toc01
LOAD CURRENT (A)
EFFICIENCY (%)
10.1
55
60
65
70
75
80
85
50
0.01 10
EN1 = VL, EN2 = GND
EN1 = VL, EN2 = VL
STEP-DOWN REGULATOR
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX17014 toc02
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)
1.60 2.001.200.800.40
3.225
3.250
3.275
3.300
3.325
3.350
3.200
0 2.40
EN1 = VL, EN2 = GND
EN1 = VL, EN2 = VL
STEP-DOWN REGULATOR
LOAD TRANSIENT RESPONSE
MAX17014 toc03
10
μ
s/div
A: V
OUT
, 100mV/div
B: LOAD CURRENT, 2A/div
C: INDUCTOR CURRENT, 1A/div
A
B
C
0A
3.3V
2A
0.1A