MAX1542ETP+ Maxim Integrated Products, MAX1542ETP+ Datasheet - Page 9

• Manufacturer Part Number: MAX1542ETP+
• Description: IC DC-DC CONV TFT-LCD 20-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX1542ETP+

• Applications: Controller, TFT, LCD
• Voltage - Input: 2.6 ~ 5.5 V
• Number Of Outputs: 2
• Voltage - Output: 2.6 ~ 13 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(V
MAX1542
3, 15, 20
IN
= 3.3V, V
—
10
11
12
13
1
2
4
5
6
7
8
9
1V/div
V
PIN
OUT_
MAIN
MAX1543
A
10
11
12
13
= 8V, f
—
1
2
3
4
5
6
7
8
9
LARGE-SIGNAL STEP RESPONSE
V
_______________________________________________________________________________________
= 1
OPERATIONAL AMPLIFIER
OSC
= 1.2MHz, T
NAME
PGND
AGND
1µs/div
POS1
NEG1
OUT1
OUT2
NEG2
POS2
COM
SRC
N.C.
SUP
I.C.
LX
TFT LCD DC-to-DC Converter with
Internal High-Voltage MOSFET Switch Common Terminal. Do not allow the voltage on
COM to exceed V
Switch Input. Source of the internal high-voltage P-channel MOSFET. Bypass SRC to
PGND with a minimum of 0.1µF close to the pins.
No Connection. Not internally connected.
Internal Connection. Make no connection to this pin.
Power Ground. PGND is the source of the main boost N-channel power MOSFET. Connect
PGND to the output capacitor ground terminals through a short, wide PC board trace.
Connect to analog ground (AGND) underneath the IC.
Analog Ground. Connect to power ground (PGND) underneath the IC.
Operational Amplifier 1 Noninverting Input
Operational Amplifier 1 Inverting Input
Operational Amplifier 1 Output
Operational Amplifier 2 Output
Operational Amplifier 2 Inverting Input
Operational Amplifier 2 Noninverting Input
Operational Amplifier Power Input. Positive supply rail for the OUT1 and OUT2 amplifiers.
Typically connected to V
Power MOSFET N-Channel Drain and Switching Node. Connect the inductor and catch
diode to LX and minimize the trace area for lowest EMI.
A
MAX1542 toc23
= +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
CHI AMPL
4.86V
CHI + OVER
4.970%
SRC
.
MAIN
Operational Amplifiers
AC-COUPLED
AC-COUPLED
. Bypass SUP to AGND with a 0.1µF capacitor.
50mV/div
50mV/div
POS_
OUT_
FUNCTION
V
SUP
SMALL-SIGNAL STEP RESPONSE
= 8V, A
OPERATIONAL AMPLIFIER
V
= 1
200ns/div
Pin Description
MAX1542 toc24
CH2 + OVER
6.234%
CH2 - OVER
2.352%
9