Datasheet

Step-Up, Step-Down Regulator, Gate-On Charge Pump,
and Boost-Buck Regulator for TV TFT LCD Display
MAX17122
______________________________________________________________________________________ 11
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
BOOST-BUCK REGULATOR OUTPUT
TEMPERATURE COMPENSATION
MAX17122 toc14
TEMPERATURE (°C)
OUTPUT VOLTAGE (V)
6040200-20
-20
-15
-10
-5
0
-25
-40 80
BOOST-BUCK REGULATOR
LOAD-TRANSIENT
RESPONSE (40mA TO 380mA)
MAX17122 toc12
V
GOFF2
(AC-COUPLED)
200mV/div
I
LOAD
200mA/div
0A
L3 = 22µH
C
COMP3
= 470pF
R
COMP3
= 47.5kI
C
COMP3P
= 10pF
0V
100µs/div
POSITIVE CHARGE-PUMP
REGULATOR LOAD-TRANSIENT
RESPONSE (0A TO 100mA)
MAX17122 toc16
V
GON
(AC-COUPLED)
1V/div
I
LOAD
50mA/div
0A
0V
V
AVDD
= 16.5V
I
AVDD
= 350mA
40µs/div
BOOST-BUCK REGULATOR PEAK
INDUCTOR CURRENT AT CURRENT
LIMIT vs. INPUT VOLTAGE
MAX17122 toc13
INPUT VOLTAGE (V)
PEAK INDUCTOR CURRENT (A)
13129 10 11
2.05
2.10
2.15
2.20
2.25
2.30
2.35
2.40
2.00
8 14
POSITIVE CHARGE-PUMP REGULATOR
NORMALIZED LOAD REGULATION
MAX17122 toc15
LOAD CURRENT (mA)
OUTPUT-VOLTAGE ERROR (%)
15010050
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.0
0 200
V
IN
= 10V
V
IN
= 12V
V
AVDD
= 16.5V
I
AVDD
= 350mA