EL7641ILTZ datasheet(9/19 Pages) RENESAS

9 / 19 page

EL7640, EL7641, EL7642

FN7415 Rev 2.00

Page 9 of 19

February 22, 2006

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 (VON and VOFF) with

multiple protection functions. The block diagram 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 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.

FIGURE 13. START-UP SEQUENCE

FIGURE 14. OP AMP RAIL-TO-RAIL INPUT/OUTPUT

FIGURE 15. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

FIGURE 16. PACKAGE POWER DISSIPATION vs AMBIENT

TEMPERATURE

Typical Performance Curves (Continued)

INPUT

VOLTAGE

VBOOST

VON

VOFF

CDEL=220nF

TIME (20ms/DIV)

INPUT

OUTPUT

TIME (50µs/DIV)

JEDEC JESD51-3 AND SEMI G42-88

(SINGLE LAYER) TEST BOARD

0.8

0.7

0.5

0.3

0.2

0.1

255075

100

150

AMBIENT TEMPERATURE (°C)

125

0.6

0.4

JA=125°C/W

QFN32

758mW

JEDEC JESD51-7 HIGH EFFECTIVE

THERMAL CONDUCTIVITY TEST BOARD -

QFN EXPOSED DIEPAD SOLDERED TO

PCB PER JESD51-5

2.5

1.5

0.5

255075

100

150

AMBIENT TEMPERATURE (°C)

2.857W

JA=35°C/W

QFN32

125

TABLE 1. RECOMMENDED COMPONENTS

DESIGNATION

DESCRIPTION

C1, C2, C3

10µF, 16V X5R ceramic capacitor (1210)

TDK C3216X5R0J106K

1A 20V low leakage schottky rectifier

(CASE 457-04)

ON SEMI MBRM120ET3

D11, D12, D21 200mA 30V schottky barrier diode (SOT-23)

Fairchild BAT54S

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

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