参数资料
型号: LTC3424EMS#TR
厂商: Linear Technology
文件页数: 5/12页
文件大小: 0K
描述: IC REG BOOST SYNC ADJ 2A 10MSOP
标准包装: 2,500
类型: 升压(升压)
输出类型: 可调式
输出数: 1
输出电压: 1.5 V ~ 5.5 V
输入电压: 0.5 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 3MHz
电流 - 输出: 2A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 带卷 (TR)
供应商设备封装: 10-MSOP
其它名称: LTC3424EMSTR
LTC3423/LTC3424
TYPICAL PERFOR A CE CHARACTERISTICS
1.10
1.05
1.00
0.95
0.90
0.85
0.80
0.75
0.70
0.65
Shutdown Threshold
44
42
40
38
36
34
32
Burst Mode Operation Current
0.60
–55
–15
25
65
105 125
30
–55
–15
25
65
105 125
f OSC =
TEMPERATURE ( ° C)
3423/24 G13
PI FU CTIO S
R t (Pin 1): Timing Resistor to Program the Oscillator
Frequency.
3 ? 10 10
Hz
R t
MODE/SYNC (Pin 2): Burst Mode Select and Oscillator
Synchronization.
MODE/SYNC = High. Enable Burst Mode operation. The
inductor peak inductor current will be 400mA and
return to zero current on each cycle. During Burst Mode
operation the operation is variable frequency, providing
a significant efficiency improvement at light loads. It is
recommended the Burst Mode operation only be en-
tered once the part has started up.
MODE/SYNC = Low. Disable Burst Mode operation and
maintain low noise, constant frequency operation.
MODE/SYNC = External CLK. Synchronization of the
internal oscillator and Burst Mode operation disable. A
clock pulse width of 100ns to 2 μ s is required to
synchronize.
V IN (Pin 3): Voltage Sense for Internal Circuitry.
TEMPERATURE ( ° C)
3423/24 G14
SW (Pin 4): Switch Pin. Connect inductor and optional
Schottky diode here. Minimize trace length to keep EMI
down.
GND (Pin 5): Signal and Power Ground for the IC.
V DD (Pin 6): Power Source for the IC. Typically derived
from a higher voltage power converter. Requires an input
of 2.7V to 5.5V. A 2.2 μ F ceramic bypass capacitor is
recommended as close to the pins as possible.
V OUT (Pin 7): Output of the Synchronous Rectifier.
FB (Pin 8): Feedback Pin. Connect resistor divider tap
here. The output voltage can be adjusted from 1.5V to
5.5V. The feedback reference voltage is typically 1.25V.
V C (Pin 9): Error Amp Output. A frequency compensation
network is connected to this pin to compensate the loop.
See the section “Compensating the Feedback Loop” for
guidelines.
SHDN (Pin 10): Shutdown. Grounding this pin shuts down
the IC. Tie to >1V to enable (V DD or digital gate output).
During shutdown the output voltage will hold up to V IN
minus a diode drop due to the body diode of the PMOS
synchronous switch. If the application requires a com-
plete disconnect during shutdown then refer to section
“Output Disconnect”.
34234f
5
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