ISL97642 Просмотр технического описания (PDF) - Renesas Electronics
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ISL97642 Datasheet PDF : 19 Pages
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ISL97642
Typical Performance Curves (Continued)
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD -
QFN EXPOSED DIEPAD SOLDERED TO
3.0 PCB PER JESD51-5
2.5 2.857W
2.0
1.5
QFN32
JA = 35°C/W
1.0
0.5
0
0
25 50 75 85 100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 13. OP AMP RAIL-TO-RAIL INPUT/OUTPUT
JEDEC JESD51-3 AND SEMI G42-88
(SINGLE LAYER) TEST BOARD
0.8
0.7 758mW
0.6
0.5
QFN32
JA = 125°C/W
0.4
0.3
0.2
0.1
0
0
25 50 75 85 100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 14. PACKAGE POWER DISSIPATION vs AMBIENT
TEMPERATURE
INPUT
OUTPUT
TIME (50µs/DIV)
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Applications Information
The ISL97642 provides 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 (VON and VOFF) with multiple protection
functions. The block diagram of the whole part is shown in
Figure 16. Table 1 lists the recommended components.
The ISL97642 integrates an N-Channel MOSFET in boost
converter to minimize the external component counts and cost.
The VON, VOFF linear-regulators are independently regulated
by using external resistors. To achieve higher voltage than
VBOOST, one or multiple stage charge pumps may be used.
TABLE 1. RECOMMENDED COMPONENTS
DESIGNATION
DESCRIPTION
C1, C2, C3 10µF, 16V X5R ceramic capacitor (1210)
TDK C3216X5R0J106K
D1
1A 20V low leakage Schottky rectifier
(CASE 457-04)
ON SEMI MBRM120ET3
D11, D12, D21 200mA, 30V Schottky barrier diode (SOT-23)
Fairchild BAT54S
L1
6.8µH, 1.3A Inductor
TDK SLF6025T-6R8M1R3-PF
Q11
200mA, 40V PNP amplifier (SOT-23)
Fairchild MMBT3906
Q21
200mA, 40V NPN amplifier (SOT-23)
Fairchild MMBT3904
FN6436 Rev 0.00
June 18, 2007
Page 9 of 19
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