MAX1885EUP-T Maxim Integrated, MAX1885EUP-T Datasheet - Page 10

• Manufacturer Part Number: MAX1885EUP-T
• Description: LCD Drivers Quad-Output TFT LCD DC-DC Converter with Buffer
• Manufacturer: Maxim Integrated

Specifications of MAX1885EUP-T

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Package / Case: TSSOP-20
• Mounting Style: SMD/SMT

Quad-Output TFT LCD DC/DC
Converters with Buffer
(Circuit of Figure 1, V
BUF+ = FLTSET = TGND = PGND = GND, T
MAX1778/MAX1880–MAX1885
10
200mA
8.0V
7.9V
100
8.1V
90
80
70
60
50
40
30
1A
0
0
STEP-UP CONVERTER LOAD-TRANSIENT
0
A. I
B. V
C. INDUCTOR CURRENT, 1A/div
C
NEGATIVE CHARGE-PUMP EFFICIENCY
INTG
MAIN
MAIN
= 1000pF
V
SUPN
= 20mA to 200mA, 200mA/div
= 8V, 100mV/div
10
vs. LOAD CURRENT
= 6V
RESPONSE
I
40µs/div
NEG
20
(mA)
IN
= +3.3V, SHDN = IN, V
V
V
V
SUPN
SUPN
30
NEG
MAX1778 toc13
= -5V
= 8V
= 7V
40
A
B
C
A
= +25°C.)
200mA
Typical Operating Characteristics (continued)
-10
-12
-14
8.1V
8.0V
7.9V
-2
-4
-6
-8
1A
0
0
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
2
STEP-UP CONVERTER LOAD-TRANSIENT
A. I
B. V
C. INDUCTOR CURRENT, 1A/div
INTG = REF
MAXIMUM NEGATIVE CHARGE-PUMP
RESPONSE WITHOUT INTEGRATOR
MAIN
MAIN
MAIN
4
= 20mA to 200mA, 200mA/div
= 8V, 100mV/div
I
NEG
= V
6
= 1mA
V
40µs/div
SUPN
SUPP
8
I
NEG
(V)
= 10mA
= V
10
SUPN
MAX1778 toc14
12
= V
14
A
B
C
SUPB
1.27
1.26
1.25
1.24
1.23
0.5A
8.0V
7.9V
0.5A
1A
= V
0
0
0
STEP-UP CONVERTER LOAD-TRANSIENT
A. I
B. V
C. INDUCTOR CURRENT, 500mA/div
SUPL
MAIN
MAIN
vs. REFERENCE LOAD CURRENT
20
= 0 to 500mA, 500mA/div
RESPONSE (1µs PULSES)
= 8V, 100mV/div
REFERENCE VOLTAGE
= 8V, BUF- = BUFOUT,
40
I
REF
4µs/div
(µA)
60
Maxim Integrated
80
MAX1778 toc15
100
A
B
C