MAX1882 데이터 시트보기 (PDF) - Maxim Integrated
부품명
상세내역
제조사
MAX1882 Datasheet PDF : 38 Pages
| |||
Quad-Output TFT LCD DC-DC
Converters with Buffer
INPUT
VIN = 3.3V CIN
4.7µF
C1
0.22µF
CREF
0.22µF
L1
6.8µH
IN
LX
SHDN
FB
MAX1778
INTG
REF
PGND
SUPB
BUF-
BUFOUT
BUF+
GND
Figure 11. VCOM Buffer Soft-Start;
the Typical Operating Characteristics. Set the resistive
divider to precharge BUFOUT, matching the buffer’s
output set voltage:
R3
=
R4
VSUPB
VBUFOUT
−
1
These resistor values are selected to charge the output
capacitor close to the output set voltage before the
buffer starts up:
CBUFOUT(R3 ||R4)
≈
5000
fOSC
R1
274kΩ
R2
49.9kΩ
R3
10kΩ
R4
10kΩ
MAIN
COUT
VMAIN = 8V
(2) 4.7µF
CSUPB
1.0µF
CBUF
1.0µF
BUFFER OUTPUT
VBUFOUT = VSUPB/2
[( ) ] R3 = R4
VSUPB -1
VBUFOUT
PART
MAX1778
MAX1880
MAX1881
MAX1882
MAX1883
MAX1884
MAX1885
Selector Guide
STEP-UP
SWITCHING
FREQUENCY
(Hz)
1M
1M
500k
500k
1M
500k
500k
DUAL
CHARGE
PUMPS
Yes
Yes
Yes
Yes
No
No
No
LINEAR
REGULATOR
Yes
No
Yes
No
Yes
Yes
No
______________________________________________________________________________________ 35
Share Link: 