MAX1748-MAX8726 데이터 시트보기 (PDF) - Maxim Integrated
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MAX1748-MAX8726 Datasheet PDF : 16 Pages
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Triple-Output TFT-LCD
DC-DC Converters
Typical Operating Characteristics (continued)
(Circuit of Figure 5, VIN = 3.3V, TA = +25°C, unless otherwise noted.)
MAIN BOOST STARTUP WAVEFORM
MAX1748/8726 toc16
MAIN BOOST STARTUP
WAVEFORM WITH LOAD
MAX1748/8726 toc17
2V
VSHDN
2V/div
2V
VSHDN
2V/div
0
0
10V
VMAIN
10V
VMAIN
5V/div
5V/div
0
0
ILX
500mA/div
0
ILX
0
500mA/div
1ms/div
RMAIN = 1kΩ, VMAIN = 10V
1ms/div
VMAIN = 10V, RMAIN = 50Ω (200mA)
MAX1748 POWER-UP SEQUENCING
MAX1748/8726 toc18
VSHDN
2V/div
VMAIN
5V/div
MAX8726 POWER-UP SEQUENCING
MAX1748/8726 toc19
VSHDN
5V/div
VMAIN
5V/div
VNEG
5V/div
VPOS
10V/div
VNEG
5V/div
VPOS
10V/div
2ms/div
VMAIN = 10V, VNEG = -5V, VPOS = 15V
4ms/div
VMAIN = 10V, VNEG = -5V, VPOS = 15V
Pin Description
PIN
NAME
FUNCTION
1
RDY
Active-Low, Open-Drain Output. Indicates all outputs are ready. The on-resistance is 125Ω (typ).
2
FB
Main Boost Regulator Feedback Input. Regulates to 1.248V nominal. Connect feedback resistive
divider to analog ground (GND).
3
INTG
Main Boost Integrator Output. If used, connect 470pF to analog ground (GND). To disable integrator,
connect to REF.
4
IN
Supply Input. +2.7V to +5.5V input range. Bypass with a 0.1µF capacitor between IN and GND, as
close to the pins as possible.
5
GND
Analog Ground. Connect to power ground (PGND) underneath the IC.
6
REF
Internal Reference Bypass Terminal. Connect a 0.22µF capacitor from this terminal to analog ground
(GND). External load capability to 50µA.
7
FBP
Positive Charge-Pump Regulator Feedback Input. Regulates to 1.25V nominal. Connect feedback
resistive divider to analog ground (GND).
_______________________________________________________________________________________ 7
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