MAX1778EUG+ Maxim Integrated Products, MAX1778EUG+ Datasheet - Page 11

• Manufacturer Part Number: MAX1778EUG+
• Description: IC DCDC CONV MULTI OUT 24TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX1778EUG+

• Applications: Converter, TFT, LCD
• Voltage - Input: 2.7 ~ 5.5 V
• Number Of Outputs: 5
• Voltage - Output: 2.7 ~ 13 V
• Operating Temperature: 0°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(Circuit of Figure 1, V
BUF+ = FLTSET = TGND = PGND = GND, T
-10V
20V
20V
10V
-5V
5V
8V
2V
0
0
0
A. V
B. RDY, 5V/div
C. POSITIVE CHARGE PUMP = V
D. STEP-UP CONVERTER: V
E. NEGATIVE CHARGE PUMP: V
A. V
B. V
C. V
SHDN
MAIN
NEG
POS
RIPPLE VOLTAGE WAVEFORMS
= -5V, I
= 20V, I
= 8V, I
= O TO 2V, 2V/div
POWER-UP SEQUENCE
NEG
MAIN
POS
= 10mA, 20mV/div
= 5mA, 20mV/div
= 200mA, 10mV/div
2ms/div
1μs/div
______________________________________________________________________________________
MAIN
IN
NEG
POS
= 8V, R
= -5V, R
= +3.3V, SHDN = IN, V
= 20V, R
LOAD
MAX1778 toc19
MAX1778 toc16
LOAD
LOAD
= 40Ω, 10V/div
= 500Ω, 10V/div
= 4kΩ, 10V/div
A
B
C
D
E
A
B
C
A
= +25°C.)
0.5A
10V
20V
6V
4V
-5V
Typical Operating Characteristics (continued)
2V
8V
2V
4V
0
0
0
0
0
A. V
B. V
C. INDUCTOR CURRENT, 500mA/div
R
A. RDY, 2V/div
B. POSITIVE CHARGE PUMP, V
C. STEP-UP CONVERTER: V
D. NEGATIVE CHARGE PUMP, V
LOAD
Quad-Output TFT LCD DC-DC
SHDN
MAIN
= 400Ω
MAIN
SOFT-START (LIGHT LOAD)
= 8V, 2V/div
= O TO 2V, 2V/div
(CIRCUIT OF FIGURE 10)
STEP-UP CONVERTER
POWER-UP SEQUENCE
= V
1ms/div
1ms/div
SUPP
Converters with Buffer
MAIN(SYS)
POS(SYS)
NEG
= V
= -5V, -5V/div
= 8V, 10V/div
SUPN
MAX1778 toc17
= 20V, 10V/div
MAX1778 toc20
= V
A
B
C
A
B
C
D
SUPB
1.0A
0.5A
10V
4V
2V
5V
5V
8V
6V
4V
2V
0
0
0
0
0
= V
A. RDY, 2V/div
B. GATE OF N-CH MOSFET, 5V/div
C. STEP-UP CONVERTER, V
A. V
B. V
C. INDUCTOR CURRENT, 500mA/div
R
LOAD
V
SHDN
MAIN
POWER-UP INTO SHORT-CIRCUIT
MAIN(SYS)
SUPL
= 20Ω
SOFT-START (HEAVY LOAD)
= 8V, 2V/div
= O TO 2V, 2V/div
(CIRCUIT OF FIGURE 10)
STEP-UP CONVERTER
= GND
= 8V, BUF- = BUFOUT,
100μs/div
1ms/div
MAIN(START)
= 8V, 5V/div
MAX1778 toc18
MAX1778 toc21
C
A
B
C
11
A
B