Datasheet

MAX17113
Low-Cost, Multiple-Output
Power Supply for LCD TVs
8 _______________________________________________________________________________________
Note 1: 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 2: Disables boost switching if either SUP, SWI, or OVIN exceeds the threshold. Switching resumes when no threshold is exceeded.
Note 3: Specifications to T
A
= -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
VIN
= V
IN2
= 12V, T
A
= -40°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
MODE Voltage Threshold for Enabling
DRN Switch Control in Mode 2
GON connects to DRN 1.15 1.35 V
MODE Current-Source Stop Voltage
Threshold
MODE rising 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
SUPP
= 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
LOAD CURRENT (A)
EFFICIENCY (%)
10.10
55
60
65
70
75
80
85
50
0.01 10
MAX17113 toc01
EN1 = VL, EN2 = VL
EN1 = VL, EN2 = GND
STEP-DOWN REGULATOR OUTPUT
VOLTAGE vs. LOAD CURRENT
LOAD CURRENT (A)
OUTPUT-VOLTAGE ERROR (%)
2.001.601.200.800.40
-1
0
1
2
3
-2
0 2.40
MAX17113 toc02
EN2 = VL
EN2 = GND
STEP-DOWN REGULATOR
LOAD-TRANSIENT RESPONSE
MAX17113 toc03
50mA
3.3V
0A
I
OUT
2A/div
V
OUT
200mV/div
AC-COUPLED
INDUCTOR
CURRENT
2A/div
20Fs/div
L = 4.7FH