MAX17062 Maxim Integrated Products, MAX17062 Datasheet - Page 6

• Manufacturer Part Number: MAX17062
• Description: TFT-LCD Step-Up DC-DC Converter
• Manufacturer: Maxim Integrated Products

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TFT-LCD Step-Up DC-DC Converter
Figure 1. Typical Operating Circuit
6
PIN
4, 5
6, 7
10
EP
_______________________________________________________________________________________
1
2
3
8
9
NAME
COMP
AGND
PGND
FREQ
FB
LX
SS
IN
Compensation Pin for Error Amplifier. Connect a series RC from COMP to ground. See the Loop
Compensation section for component selection guidelines.
Feedback Pin. The FB regulation voltage is 1.24V nominal. Connect an external resistive voltage-divider
between the step-up regulator’s output (V
divider close to the IC and minimize the trace area to reduce noise coupling. Set V
Output Voltage Selection section.
Shutdown Control Input. Drive
Power Ground. Connect pins 4 and 5 directly together.
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 together.
Supply Pin. Bypass IN with a minimum 1μF ceramic capacitor directly to AGND.
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 6μA pulldown current.
Soft-Start Control Pin. Connect a soft-start capacitor (C
start capacitor is charged with a constant current of 4μA. Full current limit is reached when the voltage of
SS pin is charged to 1.5V, which is the current-limit time, t = 2.4
discharged to ground when
after which soft-start begins.
Exposed Pad. Connect to AGND.
4.7μF
10V
4.5V TO 5.5V
C1
V
IN
4.7μF
10V
C2
1μF
C3
33nF
C4
R1
10Ω
10
8
3
9
IN
SHDN
FREQ
SS
560pF
47kΩ
is low. When
MAX17062
C5
R2
low to turn off the MAX17062.
2.7μH
COMP
1
L1
OUT
) and AGND, with the center tap connected to FB. Place the
PGND
PGND
AGND
C6
OPEN
LX
LX
FB
FUNCTION
6
7
5
4
2
EP
SS
goes high, the soft-start capacitor is charged to 0.4V,
) to this pin. Leave open for no soft-start. The soft-
D1
10
R4
221kΩ
R3
20kΩ
5
C
C7
10μF
25V
SS
. The soft-start capacitor is
+15V/600mA
C8
10μF
25V
Pin Description
OUT
V
OUT
according to the