Datasheet
MAX17094
Internal-Switch Boost Regulator with Integrated
7-Channel Driver, VCOM Calibrator, Op Amp, and LDO
14 ______________________________________________________________________________________
Pin Description (continued)
PIN NAME FUNCTION
43 EN
Enable. Pull EN low to turn off the DC-DC converter and the op amp. The high-voltage scan drivers
and LDO remain active if sufficient voltage is available for operation.
44 IN Supply. Bypass to AGND with a minimum 0.1μF ceramic capacitor.
45 SENSE
Input-Voltage Threshold Detector. Connect this pin to V
IN
through a resistor-divider. When the
voltage at the SENSE pin falls below a 1.235V threshold, YDCHG is driven to V
GON1
.
46 COMP
Compensation Pin for Error Amplifier. Connect a series RC from COMP to AGND. Typical values
are 40.2k and 1000pF.
47 AGND Analog GND
48 VL
On-Chip Regulator Output. This regulator powers internal analog circuitry. Bypass VL to AGND with
a 0.22μF or greater ceramic capacitor.
— EP
Exposed Backside Pad. Connect to AGND and make AGND copper plane as level as possible to
help external dissipation.
Typical Operating Circuit
The MAX17094 typical operating circuit (Figure 2) gen-
erates a +8V source-driver supply and approximately
+22V and -6.5V gate-driver supplies for TFT displays.
The input-voltage range for the IC is from +1.8V to
+5.5V, but the Figure 2 circuit is designed to run from
2.5V to 3.6V. Table 1 lists the recommended compo-
nents and Table 2 lists the component suppliers. Figure
3 is the MAX17094 functional diagram.
Table 1. Component List
DESIGNATION DESCRIPTION
C1
4.7μF ±10%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J475K
TDK C1608X5R0J475K
C2, C3
1μF ±20%, 6.3V X5R ceramic
capacitors (0402)
Murata GRM155R60J105K
TDK C1005X5R0J105M
C4
10μF ±20%, 6.3V X5R ceramic
capacitor (0603)
Murata GRM188R60J106M
TDK C1608X5R0J106K
C5, C6
4.7μF ±10%, 16V X5R ceramic
capacitors (0805)
Murata GRM21BR61C475K
Taiyo Yuden EMK212BJ475KG
D1
30V Schottky diode, 1A (S-Flat)
Toshiba CRS02
L1
4.1μH, 1.95A, 57m inductor (6mm x
6mm x 2mm)
Sumida CDRH5D18NP-4R1NC
Coiltronics SD6020-4R1-R
Table 2. Component Suppliers
SUPPLIER WEBSITE
Coiltronics www.cooperet.com
Murata Electronics North
America, Inc.
www.murata-northamerica.com
Sumida Corp. www.sumida.com
Taiyo Yuden www.t-yuden.com
TDK Corp. www.component.tdk.com
Toshiba America Electronic
Components, Inc.
www.toshiba.com/taec