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| 型号： | LTC1753CSW#TR |
| 厂商： | Linear Technology |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG SW 5BIT PROG SYNC 20SOIC |
| 标准包装： | 1,000 |
| 应用： | 控制器，Intel Pentium? III |
| 输入电压： | 5V |
| 输出数： | 1 |
| 输出电压： | 1.3 V ~ 3.5 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 供应商设备封装： | 20-SOIC |
| 包装： | 带卷 (TR) |
LTC1753
APPLICATIO S I FOR ATIO
Table 3. Recommended R IMAX Resistor (k ? ) vs Maximum Operating Load Current and External MOSFET Q1
MAXIMUM OPERATING
Si4410
MTD20N03
LOAD CURRENT (A)
8
10
12
14
16
18
Si4410
820
1.2k
—
—
—
—
(TWO IN PARALLEL)
430
560
680
820
910
1.2k
SUD50N03
680
820
1k
1.2k
1.5k
—
(TWO IN PARALLEL)
1k
1.2k
1.5k
1.8k
2.0k
2.2k
overloads may not affect the output voltage at all. More
V IN
significant overload conditions will allow the SS pin to
reach a steady state, and the output will remain at a
LTC1753
I MAX
R IMAX
+
C IN
reduced voltage until the overload is removed. Serious
+
7
overloads will generate a large overdrive at CC, allowing it
CC
190 μ A
G1
Q1
to pull SS down quickly and preventing damage to the
output components.
–
I FB
8
20 ?
L O
+
V OUT
By using the R DS(ON) of Q1 to measure the output current,
the current limiting circuit eliminates an expensive dis-
G2
Q2
C OUT
1753 F05
crete sense resistor that would otherwise be required. This
( I LMAX )( R DS ( ON ) Q 1 )
I LMAX LOAD + RIPPLE
= I
helps minimize the number of components in the high
current path. Due to switching noise and variation of
R DS(ON) , the actual current limit trip point is not highly
accurate. The current limiting circuitry is primarily meant
to prevent damage to the power supply circuitry during
fault conditions. The exact current level where the limiting
circuit begins to take effect will vary from unit to unit as the
R DS(ON) of Q1 varies.
For a given current limit level, the external resistor from
I MAX to V IN can be determined by:
R IMAX =
I IMAX
where,
I
2
I LOAD = Maximum load current
I RIPPLE = Inductor ripple current
= ( V IN ? V OUT )( V OUT )
( f OSC )( L O )( V IN )
12
Figure 5. Current Limit Setting
f OSC = LTC1753 oscillator frequency = 300kHz
L O = Inductor value
R DS(ON)Q1 = Hot on-resistance of Q1 at I LMAX
I IMAX = Internal 190 μ A sink current at I MAX
OUTEN and Thermistor Input
The LTC1753 includes a low power shutdown mode,
controlled by the logic at the OUTEN pin. A high at OUTEN
allows the part to operate normally. A low level at OUTEN
stops all internal switching, pulls COMP and SS to ground
internally and turns Q1 and Q2 off. PWRGD is pulled low,
and FAULT is left floating. In shutdown, the LTC1753
quiescent current drops to about 130 μ A. The residual
current is used to keep the thermistor sensing circuit at
OUTEN alive. Note that the leakage current of the external
MOSFETs may add to the total shutdown current con-
sumed by the circuit, especially at elevated temperatures.
OUTEN is designed with two thresholds to allow it to also
be utilized for overtemperature protection. The power
MOSFET operating temperature can be monitored with an
external negative temperature coefficient (NTC) thermistor
1753fa
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