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参数资料
| 型号： | MAX1748EUE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV TRPL LCD 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 3 |
| 输出电压： | 2.7 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
Triple-Output TFT-LCD
DC-DC Converters
V IN = 2.7V TO 5.5V
IN
L1
V OUT = [1 + (R1 / R2)] x V REF
V REF = 1.25V
OSC
S
LX
D1
V MAIN
(UP TO 13V)
R
Q
R1
INTG
-
+
+
I LIM
-
Gm
+
PGND
FB
REF
R COMP
R2
C1
C INTG
+ -
GND
C2
C COMP
MAX1748
MAX8726
Figure 1. PWM Boost Converter Block Diagram
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 at the end of phase III or when the output
reaches regulation, whichever occurs first (see the start-
up 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.
1.25V
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.
_______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX17491GTA+T | 功能描述:功率驱动器IC Notebook MOSFET Driver RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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