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參數(shù)資料
| 型號： | MAX8726EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple-Output TFT-LCD DC-DC Converters |
| 中文描述： | 2 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, 0.65 MM PITCH, MO-153-AB, TSSOP-16 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 640K |
| 代理商： | MAX8726EUE |
M
Triple-Output TFT-LCD
DC-DC Converters
_______________________________________________________________________________________
9
Soft-Start
For the main boost regulator, soft-start allows a gradual
increase of the internal current-limit level during startup
to reduce input surge currents. The MAX1748/MAX8726
divide the soft-start period into four phases. During
phase 1, the MAX1748/MAX8726 limit the current limit to
only 0.38A (see the
Electrical Characteristics
tables),
approximately a quarter of the maximum current limit
(I
LX(MAX)
). If the output does not reach regulation within
1ms, soft-start enters phase II and the current limit is
increased by another 25%. This process is repeated for
phase III. The maximum 1.5A (typ) current limit is
reached within 3.0ms or when the output reaches regu-
lation, whichever occurs first (see the startup waveforms
in the
Typical Operating Characteristics
).
For the charge pumps, soft-start is achieved by control-
ling the rise rate of the output voltage. The output volt-
age regulates within 4ms, regardless of output
capacitance and load, limited only by the regulator’s
output impedance.
Shutdown
A logic-low level on
SHDN
disables all three
MAX1748/MAX8726 converters and the reference.
When shut down, supply current drops to 0.1μA to
maximize battery life and the reference is pulled to
ground. The output capacitance and load current
determine the rate at which each output voltage will
decay. A logic-level high on
SHDN
power activates the
MAX1748/MAX8726 (see the
Power-Up Sequencing
section). Do not leave
SHDN
floating. If unused,
connect
SHDN
to IN.
Power-Up Sequencing
Upon power-up or exiting shutdown, the MAX1748 and
MAX8726 start their respective power-up sequences.
LX
GND
PGND
1.25V
R2
V
IN
= 2.7V TO 5.5V
L1
IN
R1
Q
R
S
OSC
REF
FB
V
MAIN
(UP TO 13V)
V
OUT
=
[1 + (R1 / R2)] x V
REF
V
REF
= 1.25V
I
LIM
C1
C2
C
COMP
R
COMP
D1
INTG
+
+
+
-
+
-
-
MAX1748
MAX8726
Gm
+ -
C
INTG
Figure 1. PWM Boost Converter Block Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8726EUE+ | 功能描述:LCD 驅(qū)動器 Triple-Out TFT-LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8726EUE+T | 功能描述:LCD 驅(qū)動器 Triple-Out TFT-LCD DC/DC Converter RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8726EUE-T | 功能描述:LCD 驅(qū)動器 RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube |
| MAX8727ETB | 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube |
| MAX8727ETB+ | 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube |
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