参数资料
型号: LT3580IMS8E#TRPBF
厂商: Linear Technology
文件页数: 5/28页
文件大小: 0K
描述: IC REG BOOST INV SEPIC 2A 8MSOP
标准包装: 2,500
类型: 升压(升压),反相,Sepic
输出数: 1
输入电压: 2.5 V ~ 32 V
PWM 型: 电流模式
频率 - 开关: 200kHz ~ 2.5MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 8-MSOP-EP
LT3580
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise specified
30
SHDN Pin Current
300
SHDN Pin Current
–50°C
1.40
1.38
Active/Lockout Threshold
25
250
20°C
1.36
20
15
10
5
–50°C
200
150
100
50
100°C
1.34
1.32
1.30
1.28
1.26
1.24
SHDN RISING
SHDN FALLING
0
0
100°C
0.5
20°C
1
1.5
2
0
0
5
10
15
20
25
30
1.22
1.20
–50
0
50
100
SHDN VOLTAGE (V)
PIN FUNCTIONS
3580 G10
SHDN VOLTAGE (V)
3580 G11
TEMPERATURE (°C)
3580 G12
FB (Pin 1): Positive and Negative Feedback Pin. For a
boost or inverting converter, tie a resistor from the FB pin
to V OUT according to the following equations:
RT (Pin 6): Timing Resistor Pin. Adjusts the switching
frequency. Place a resistor from this pin to ground to set
the frequency to a fixed free running level. Do not float
R FB =
R FB =
( V OUT ? 1.215 ) ; Boost or SEPIC Converter
83.3 ? 10 ? 6
( V OUT + 5mV ) ; Inverting Converter
83.3 ? 10 ? 6
this pin.
SS (Pin 7): Soft-Start Pin. Place a soft-start capacitor here.
Upon start-up, the SS pin will be charged by a (nominally)
275k resistor to about 2.2V.
SYNC (Pin 8): To synchronize the switching frequency to
VC (Pin 2): Error Amplifier Output Pin. Tie external
compensation network to this pin.
V IN (Pin 3): Input Supply Pin. Must be locally bypassed.
SW (Pin 4): Switch Pin. This is the collector of the internal
NPN Power switch. Minimize the metal trace area connec-
ted to this pin to minimize EMI.
an outside clock, simply drive this pin with a clock. The
high voltage level of the clock needs to exceed 1.3V, and
the low level should be less 0.4V. Drive this pin to less than
0.4V to revert to the internal free running clock. See the
Applications Information section for more information.
GND (Exposed Pad Pin 9): Ground. Exposed pad must
be soldered directly to local ground plane.
SHDN (Pin 5): Shutdown Pin. In conjunction with the
UVLO (undervoltage lockout) circuit, this pin is used
to enable/disable the chip and restart the soft-start
sequence. Drive below 1.24V (LT3580E, LT3580I) or 1.22V
(LT3580H, LT3580MP) to disable the chip. Drive above
1.38V (LT3580E, LT3580I) or 1.40V (LT3580H, LT3580MP)
to activate chip and restart the soft-start sequence. Do
not float this pin.
3580fg
5
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