ISL78020 Datasheet, PDF (9/19 Pages) Intersil Corporation – Automotive Grade TFT-LCD DC/DC with Integrated Amplifiers

ISL78020, ISL78022
Typical Performance Curves T_A = +25°C, unless otherwise specified. (Continued)
INPUT VOLTAGE
V_BOOST
INPUT
V_OFF
V_ON
OUTPUT
TIME (20ms/DIV)
FIGURE 13. START-UP SEQUENCE
TIME (50µs/DIV)
FIGURE 14. OP AMP RAIL-TO-RAIL INPUT/OUTPUT
JEDEC JESD51-7 HIGH EFFECTIVE
THERMAL CONDUCTIVITY TEST BOARD -
TQFP SOLDERED TO PCB PER JESD51-5
1.8
1.5
1.613W
1.2
TQFP32
θ_JA = +62°C/W
0.9
0.6
0.3
0
0
25 50 75 100 125 150
AMBIENT TEMPERATURE (°C)
FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT TEMPERATURE
Applications Information
The ISL78020 and ISL78022 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_ON and
V_OFF) with multiple protection functions. The block diagram
of the whole part is shown in Figure 16. Table 1 lists the
recommended components.
The ISL78020 and ISL78022 integrate an N-Channel
MOSFET in boost converter to minimize the external
component counts and cost. The V_ON, V_OFF
linear-regulators are independently regulated by using
external resistors. To achieve higher voltage than V_BOOST,
one or multiple stage charge pumps may be used.
TABLE 1. RECOMMENDED TYPICAL APPLICATION
DIAGRAM 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
9
FN6386.2
December 6, 2007