MAX1778EUG+ Maxim Integrated Products, MAX1778EUG+ Datasheet - Page 35

• 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

the Typical Operating Characteristics. Set the resistive
divider to precharge BUFOUT, matching the buffer’s
output set voltage:
These resistor values are selected to charge the output
capacitor close to the output set voltage before the
buffer starts up:
Figure 11. VCOM Buffer Soft-Start;
R
C
3
BUFOUT
V
IN
=
INPUT
= 3.3V
______________________________________________________________________________________
R
4
⎡
⎢
⎢
⎣
4.7μF
(
⎛
⎜
⎝
R
C
V
3
IN
BUFOUT
V
||
SUPB
R
4
0.22μF
0.22μF
)
C
REF
C1
≈
⎞
⎟ −
⎠
5000
f
OSC
1
INTG
REF
⎤
⎥
⎥
⎦
IN
SHDN
PGND
MAX1778
6.8μH
Quad-Output TFT LCD DC-DC
L1
BUFOUT
BUF+
SUPB
BUF-
GND
LX
FB
Converters with Buffer
49.9kΩ
274kΩ
MAX1778
MAX1880
MAX1881
MAX1882
MAX1883
MAX1884
MAX1885
10kΩ
10kΩ
PART
R1
R3
R2
R4
C
1.0μF
C
1.0μF
FREQUENCY
SWITCHING
BUF
R3 = R4
SUPB
STEP-UP
C
(2) 4.7μF
500k
500k
500k
500k
(Hz)
OUT
1M
1M
1M
[(
V
V
BUFOUT
SUPB
MAIN
V
BUFFER OUTPUT
V
MAIN
BUFOUT
= 8V
)
-1
= V
CHARGE
]
PUMPS
Selector Guide
DUAL
SUPB
Yes
Yes
Yes
Yes
No
No
No
/2
REGULATOR
LINEAR
Yes
Yes
Yes
Yes
No
No
No
35