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MAX8740ETB Datasheet(PDF) 5 Page - Maxim Integrated Products

Part # MAX8740ETB
Description  TFT-LCD Step-Up DC-DC Converter
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX8740ETB Datasheet(HTML) 5 Page - Maxim Integrated Products

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TFT-LCD Step-Up DC-DC Converter
_______________________________________________________________________________________
5
PIN
NAME
FUNCTION
1
COMP
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop
Compensation section for component selection guidelines.
2FB
Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider
between the step-up regulator’s output (VOUT) and GND, with the center tap connected to FB. Place the
divider close to the IC and minimize the trace area to reduce noise coupling. Set VOUT according to the
Output Voltage Selection section.
3
SHDN
Shutdown Control Input. Drive SHDN low to turn off the MAX8740.
4, 5
GND
Ground. Connect pins 4 and 5 directly together.
6, 7
LX
Switch Pin. LX is the drain of the internal MOSFET. Connect the inductor/rectifier diode junction to LX and
minimize the trace area for lower EMI. Connect pins 6 and 7 directly together.
8IN
Supply Pin. Bypass IN with a minimum 1µF ceramic capacitor directly to GND.
9
FREQ
Frequency-Select Input. When FREQ is low, the oscillator frequency is set to 640kHz. When FREQ is high, the
frequency is 1.2MHz. This input has a 5µA pulldown current.
10
SS
Soft-Start Control Pin. Connect a soft-start capacitor (CSS) to this pin. Leave open for no soft-start. The soft-
start capacitor is charged with a constant current of 4.5µA. Full current limit is reached after t = 2.5 x 10
5 CSS.
The soft-start capacitor is discharged to ground when SHDN is low. When SHDN goes high, the soft-start
capacitor is charged to 0.4V, after which soft-start begins.
Pin Description
LX
LX
FB
GND
GND
FREQ
IN
COMP
SS
1
4
5
2
3
9
8
67
10
VOUT
13.5V/800mA
VIN
4.5V TO 5.5V
SHDN
MAX8740
C1
10
µF
6.3V
R3
10
C3
1
µF
C6
33nF
C4
560pF
C5
68pF
L1
2.7
µH
D1
R2
20k
1%
R4
47k
1%
R1
196k
1%
C2
10
µF
20V
C7
10
µF
20V
Figure 1. Typical Operating Circuit


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