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参数资料
| 型号： | SC189LSKTRT |
| 厂商： | Semtech |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V SOT23-5 |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 标准包装 |
| 供应商设备封装： | SOT-23-5 |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC189LSKDKR |
SC189
Absolute Maximum Ratings
VIN Supply Voltage ……………………………… -0.3 to 6.0V
Recommended Operating Conditions
VIN Supply Voltage ……………………………… 2.9 to 5.5V
LX Voltage
………….. -1 to V IN +1V, -3V (20ns Max), 6V Max
Maximum Output Current (3) …………………………… 1.5A
VOUT Voltage ……………………………… -0.3 to V IN +0.3V
EN Voltage …………………………………. -0.3 to V IN +0.3V
Peak IR Reflow temperature …………………………. 260°C
ESD Protection Level (2) …………………………………. 3kV
Thermal Information
Thermal Resistance, Junction to Ambient (1)
MLPD-UT6 Package ……………………………… 60°C/W
SOT23-5 Package ……………………………… 90°C/W
Operating Junction Temperature …………… -40 to +125?C
Maximum Junction Temperature …………………… +150°C
Storage Temperature Range ………………… -65 to +150 °C
Exceeding the absolute maximum ratings may result in permanent damage to the device and/or device malfunction. Operation outside of the
parameters specified in the Electrical Characteristics section is not recommended.
NOTES:
(1) Measured in free convection, mounted on 10mm x 10mm, 2 layer FR4 PCB shown in figure 7 ( for MLPD-UT6 package) and figure 8 ( for SOT23-
5 package) with copper of 1oz for each layer.
(2) Tested according to JEDEC standard JESD22-A114-B.
(3) For SOT23-5 package, the limit of the maximum power dissiption shown in figure 2 may reduce the maximum output current.
Electrical Characteristics
Unless specified: V IN = 5.0V, C IN =10μF, C OUT =10μF; L=2.2μH; -40°C<T A <+85 °C; T J(MAX) =125°C; Unless otherwise noted typical values are T A =+25 °C.
Parameter
Under-Voltage Lockout
Output Voltage Tolerance (1)
Symbol
UVLO
ΔV OUT
Conditions
Rising V IN
Hysteresis
V IN =3.6V to 5.0V; No Load
Min
2.60
-2.5
Typ
2.70
250
Max
2.80
+2.5
Units
V
mV
%
Current Limit
VIN Supply Current
I LIMIT
I Q
Peak inductor current
EN= VIN, No Load
2.0
7.5
A
mA
VIN Shutdown Current
High Side Switch Resistance
Low Side Switch Resistance
I SHDN
R DSON_P
R DSON_N
EN= GND
I LX = 100mA, for MLPD-UT6
I LX = -100mA, for SOT23-5
I LX = -100mA, for MLPD-UT6
I LX = -100mA, for SOT23-5
1
0.13
0.15
0.10
0.125
10
μA
Ω
LX Leakage Current
Line Regulation
Load Regulation (2)
Oscillator Frequency
I LK(LX)
ΔV LINE-REG
ΔV LOAD-REG
F OSC
V IN =5.5V; L X =0V; EN=GND
V IN =5.5V; L X =5.0V; EN=GND
V IN = 3.6 – 5.0V; I OUT =0A
V IN = 5.0V; I OUT =10mA – 1.5A
-10
2.0
1
-1
±1.0
±1.0
2.5
10
3.0
μA
%
%
MHz
Soft-Start Time (2)
T SS
100
μs
EN Input High Current
I EN_HI
EN=VIN
-2.0
2.0
μA
? 2009 Semtech Corp.
3
www.semtech.com
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