PDF EL7642A Data sheet ( Hoja de datos )

Número de pieza	EL7642A
Descripción	(EL7640A - EL7642A) TFT-LCD DC/DC
Fabricantes	Intersil Corporation
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No Preview Available ! ® PRELIMINARY Data Sheet EL7640A, EL7641A, EL7642A May 15, 2006 FN6270.0 TFT-LCD DC/DC with Integrated Amplifiers The EL7640A, EL7641A, and EL7642A integrate a high performance boost regulator with 2 LDO controllers for VON and VOFF, a VON-slice circuit with adjustable delay and either one (EL7640A), three (EL7641A), or five amplifiers (EL7642A) for VCOM and VGAMMA applications. The boost converter in the EL7640A, EL7641A, and EL7642A is a current mode PWM type integrating an 18V NHchannel MOSFET. Operating at 1.2MHz, this boost can operate in either P-mode for superior transient response, or in PI-mode for tighter output regulation. Using external low-cost transistors, the LDO controllers provide tight regulation for VON, VOFF, as well as providing start-up sequence control and fault protection. The amplifiers are ideal for VCOM and VGAMMA applications, with 150mA peak output current drive, 12MHz bandwidth, and 12V/µs slew rate. All inputs and outputs are rail-to-rail. Available in the 32 Ld thin QFN (5mm x 5mm) Pb-free packages, the EL7640A, EL7641A, and EL7642A are specified www.DataSheet4U.com for operation over the -40°C to +85°C temperature range. Ordering Information PART NUMBER PART TAPE & PACKAGE PKG. (Note) MARKING REEL (Pb-Free) DWG. # EL7640AILTZ 7640AILTZ - 32 Ld 5x5 MDP0051 Thin QFN EL7640AILTZ-T7 7640AILTZ 7” 32 Ld 5x5 MDP0051 Thin QFN EL7640AILTZ-T13 7640AILTZ 13” 32 Ld 5x5 MDP0051 Thin QFN EL7641AILTZ 7641AILTZ - 32 Ld 5x5 MDP0051 Thin QFN EL7641AILTZ-T7 7641AILTZ 7” 32 Ld 5x5 MDP0051 Thin QFN EL7641AILTZ-T13 7641AILTZ 13” 32 Ld 5x5 MDP0051 Thin QFN EL7642AILTZ 7642AILTZ - 32 Ld 5x5 MDP0051 Thin QFN EL7642AILTZ-T7 7642AILTZ 7” 32 Ld 5x5 MDP0051 Thin QFN EL7642AILTZ-T13 7642AILTZ 13” 32 Ld 5x5 MDP0051 Thin QFN NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. Features • Current mode boost regulator - Fast transient response - 1% accurate output voltage - 18V/3A integrated FET - >90% efficiency • 2.6V to 5.5V VIN supply • 2 LDO controllers for VON and VOFF - 2% output regulation - VON-slice circuit • High speed amplifiers - 150mA short-circuit output current - 12V/µs slew rate - 12MHz -3dB bandwidth - Rail-to-rail inputs and outputs • Built-in power sequencing • Internal soft-start • Multiple overload protection • Thermal shutdown • 32 Ld 5x5 thin QFN package • Pb-free plus anneal available (RoHS compliant) Applications • TFT-LCD panels • LCD monitors • Notebooks • LCD-TVs 1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 \| Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners. 1 page EL7640A, EL7641A, EL7642A Electrical Specifications VIN = 3V, VBOOST = VSUP = 12V, VSRC = 20V, Over temperature from -40°C to 85°C. Unless Otherwise Specified. (Continued) PARAMETER DESCRIPTION CONDITIONS MIN TYP VON-SLICE CIRCUIT VLO CTL Input Low Voltage VHI CTL Input High Voltage ILEAKCTL CTL Input Leakage Current tDrise CTL to OUT Rising Prop Delay VIN = 2.6V to 5.5V VIN = 2.6V to 5.5V CTL = AGND or IN 0.6VIN -1 1kΩ from DRN to 8V, VCTL = 0V to 3V step, no load on OUT, measured from VCTL = 1.5V to OUT = 20% 100 tDfall CTL to OUT Falling Prop Delay 1kΩ from DRN to 8V, VCTL = 3V to 0V step, no load on OUT, measured from VCTL = 1.5V to OUT = 80% 100 VSRC ISRC SRC Input Voltage Range SRC Input Current Start-up sequence not completed 150 Start-up sequence completed 150 RONSRC RONDRN RONCOM SEQUENCING SRC On Resistance DRN On Resistance COM to GND On Resistance Start-up sequence completed Start-up sequence completed Start-up sequence not completed 5 30 350 1000 tON Turn On Delay tDEL1 Delay Between VBOOST and VOFF tDEL2 Delay Between VON and VOFF tDEL3 Delay From VON to VON-slice Enabled CDEL Delay Capacitor NOTE: 1. Guaranteed by design. CDEL = 100nF (See Figure 23) CDEL = 100nF (See Figure 23) CDEL = 100nF (See Figure 23) CDEL = 100nF (See Figure 23) 10 10 10 10 22 100 MAX 0.4VIN 1 30 250 250 10 60 1800 UNIT V V µA ns ns V µA µA Ω Ω Ω ms ms ms ms nF 5 FN6270.0 May 15, 2006 5 Page EL7640A, EL7641A, EL7642A The current through MOSFET is limited to 3A peak. This restricts the maximum output current based on the following equation: IOMAX = ⎝⎛ILMT – -∆--2--I--L-⎠⎞ × V-V----I-O-N-- Where ∆IL is peak to peak inductor ripple current, and is set by: ∆IL = -V---L-I--N-- × -fD-S-- where fS is the switching frequency. SLOPE COMPENSATION CLOCK SHUTDOWN & START-UP CONTROL IFB IREF CURRENT AMPLIFIER FBB GM AMPLIFIER REFERENCE GENERATOR PWM LOGIC BUFFER IFB VOLTAGE AMPLIFIER IREF LX COMP PGND FIGURE 18. THE BLOCK DIAGRAM OF THE BOOST CONTROLLER 11 FN6270.0 May 15, 2006 11 Page

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