Rainbow Electronics MAX8712 - Manual (Page 7)

MAX8710/MAX8711/MAX8712
Low-Cost Linear-Regulator
LCD Panel Power Supplies
_______________________________________________________________________________________ 7
LINEAR-REGULATOR PULSED
LOAD-TRANSIENT RESPONSE
MAX8710/11/12 toc04
4µs/div
A
10V
B
0mA
A: V
OUTL
, 100mV/div, AC-COUPLED
B: I OUTL , 500mA/div
LINEAR-REGULATOR OVERCURRENT
PROTECTION
MAX8710/11/12 toc05
10ms/div
A
0V
B
0mA
A: V
OUTL
, 5V/div
B: I OUTL , 500mA/div
CHARGE-PUMP NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8710/11/12 toc06
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
13 12 11 10 9
1.6
1.7
1.8
1.9
2.0
1.5
8 14
POSITIVE CHARGE-PUMP LOAD
REGULATION
MAX8710/11/12 toc07
LOAD CURRENT (mA)
OUTPUT VOLTAGE ERROR (%)
40 20 30 10
-1.5
-1.0
-0.5
0
0.5
-2.0
0 50
INPUT = 12V
POSITIVE CHARGE-PUMP
LINE REGULATION
MAX8710/11/12 toc08
INPUT VOLTAGE (V)
OUTPUT VOLTAGE ERROR (%)
13 12 11
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.0
10 14
20mA LOAD CURRENT
NEGATIVE CHARGE-PUMP LOAD
REGULATION
MAX8710/11/12 toc09
LOAD CURRENT (mA)
OUTPUT VOLTAGE ERROR (%)
60 80 20 40
-1.00
-0.75
-0.50
-0.25
0.25
0
-1.25
0 100
V GOFF = -5V
INPUT = 12V
NEGATIVE CHARGE-PUMP LINE
REGULATION
MAX8710/11/12 toc10
INPUT VOLTAGE (V)
OUTPUT VOLTAGE ERROR (%)
13 12 11 10 9 8
-0.8
-0.6
-0.4
-0.2
0
0.2
-1.0
7 14
V GOFF = -5V
I GOFF = 50mA
POWER-UP SEQUENCE
MAX8710/11/12 toc11
10ms/div
A
0V
0V
C
B
0V
A: V OUTL , 10V/div
B: V GOFF , 5V/div
C: V
GON
, 10V/div
SWITCH CONTROL FUNCTION (MODE 1)
MAX8710/11/12 toc12
20µs/div
A
0V
0V
C
B
0V
A: V GON , 10V/div
B: V MODE , 5V/div
C: V
CTL
, 5V/div
C
GON
= 1.5nF
Typical Operating Characteristics (continued)
(Circuit of Figure 1. V
IN
= V
INL
= V
SUPCP
= 12V, V
OUTL
= V
SUPB
= 10V, V
SRC
= 10V, T
A
= 0°C to +85°C. Typical values are at T
A
=
+25°C, unless otherwise noted.)