Datasheet

Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
MAX17122
10 _____________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
STEP-UP REGULATOR PULSED
LOAD-TRANSIENT
RESPONSE (0.2A TO 2.2A)
MAX17122 toc07
V
AVDD
(AC-COUPLED)
200mV/div
I
LOAD
1A/div
I
L1
1A/div
0A
0A
L1 = 4.7µH
C
COMP1
= 330pF
R
COMP1
= 39.2kI
C
COMP1P
= 10pF
0V
10µs/div
STEP-UP REGULATOR
STARTUP SEQUENCE
MAX17122 toc08
V
AVDD
10V/div
V
GATE
10V/div
V
LX1
10V/div
V
EN2
5V/div
0V
0V
0V
0V
4ms/div
STEP-UP REGULATOR PEAK
INDUCTOR CURRENT AT CURRENT
LIMIT vs. INPUT VOLTAGE
MAX17122 toc09
INPUT VOLTAGE (V)
PEAK INDUCTOR CURRENT (A)
1211109
4.2
4.4
4.6
4.8
5.0
5.2
5.4
5.6
5.8
6.0
4.0
8 13
BOOST-BUCK REGULATOR
EFFICIENCY vs. LOAD CURRENT
MAX17122 toc10
LOAD CURRENT (A)
EFFICIENCY (%)
0.10
55
60
65
70
75
80
85
90
50
0.01 1
V
IN
= 10V
V
IN
= 12V
BOOST-BUCK REGULATOR NORMALIZED
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX17122 toc11
LOAD CURRENT (A)
OUTPUT-VOLTAGE ERROR (%)
0.70.60.50.40.30.20.1
-1.50
-1.00
-0.50
0
0.50
-2.00
0 0.8
V
IN
= 12V
V
IN
= 10V