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)

erwise noted.) (Note 4)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

MODE Voltage Threshold for Enabling

DRN Switch Control in Mode 2

GON connects to DRN

1.2

1.3

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

wise noted.)

STEP-DOWN REGULATOR EFFICIENCY

vs. LOAD CURRENT

LOAD CURRENT (A)

1

0.1

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

LOAD CURRENT (A)

1.60

2.00

1.20

0.80

0.40

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

µs/div

B: LOAD CURRENT, 2A/div

C: INDUCTOR CURRENT, 1A/div

A

B

C

0A

3.3V

2A

0.1A