el7641 Intersil Corporation, el7641 Datasheet - Page 9

• Manufacturer Part Number: el7641
• Description: Tft-lcd Dc/dc With Integrated Amplifiers
• Manufacturer: Intersil Corporation

Typical Performance Curves
Applications Information
The EL7640, EL7641, EL7642 provide a highly integrated
multiple output power solution for TFT-LCD applications.
The system consists of one high efficiency boost converter
and two low cost linear-regulator controllers (V
V
of the whole part is shown in Figure 17. Table 1 lists the
recommended components.
The EL7640, EL7641, EL7642 integrate an N-channel
MOSFET in boost converter to minimize the external
component counts and cost. The V
regulators are independently regulated by using external
resistors. To achieve higher voltage than V
multiple stage charge pumps may be used.
OFF
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT
VOLTAGE
V
BOOST
) with multiple protection functions. The block diagram
INPUT
V
V
OFF
ON
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
FIGURE 13. START-UP SEQUENCE
TEMPERATURE
0
JEDEC JESD51-3 AND SEMI G42-88
(SINGLE LAYER) TEST BOARD
758mW
25
AMBIENT TEMPERATURE (°C)
TIME (20ms/DIV)
50
θ
JA
9
QFN32
=125°C/W
75
85
ON
100
, V
C
DEL
OFF
(Continued)
BOOST
=220nF
125
linear-
ON
EL7640, EL7641, EL7642
150
, one or
and
DESIGNATION
D
FIGURE 16. PACKAGE POWER DISSIPATION vs AMBIENT
C
11
1
, D
, C
FIGURE 14. OP AMP RAIL-TO-RAIL INPUT/OUTPUT
Q
Q
D
L
OUTPUT
12
11
21
1
2
1
INPUT
, C
, D
TABLE 1. RECOMMENDED COMPONENTS
2.5
1.5
0.5
3
21
3
2
1
0
TEMPERATURE
0
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD -
QFN EXPOSED DIEPAD SOLDERED TO
PCB PER JESD51-5
2.857W
10µF, 16V X5R ceramic capacitor (1210)
TDK C3216X5R0J106K
1A 20V low leakage schottky rectifier
(CASE 457-04)
ON SEMI MBRM120ET3
200mA 30V schottky barrier diode (SOT-23)
Fairchild BAT54S
6.8µH 1.3A Inductor
TDK SLF6025T-6R8M1R3-PF
200mA 40V PNP amplifier (SOT-23)
Fairchild MMBT3906
200mA 40V NPN amplifier (SOT-23)
Fairchild MMBT3904
25
AMBIENT TEMPERATURE (°C)
50
TIME (50µs/DIV)
θ
JA
DESCRIPTION
75
QFN32
=35°C/W
85
100
125
February 22, 2006
150
FN7415.2