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| 型号： | SC185QULTRT |
| 厂商： | Semtech |
| 文件页数： | 3/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 4A 16MLPQ |
| 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： | 3.3V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 4A |
| 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： | 16-UFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-MLPQ-UT（3x3） |
| 其它名称： | SC185QULDKR |
SC185
Absolute Maximum Ratings
PVIN and AVIN Supply Voltages ………………… -0.3 to 6.0V
Recommended Operating Conditions
Supply Voltage PVIN and AVIN …………………… 2.9 to 5.5V
LX Voltage (9) ……………………
-0.3 to PVIN+0.3V, 6V Max
Maximum Output Current ………………………………… 4.0A
VOUT Voltage …………………………… -0.3 to AVIN+0.3V
CTLx pins Voltages ……………………… -0.3 to AVIN+0.3V
Temperature Range …………………………… -40 to +85?C
Input Capacitor ………………………………………… 22uF
Peak IR Reflow Temperature …………………………. 260°C
Output Capacitor
……………………… 47uF (or 2 x 22uF)
ESD Protection Level (8) ………………………………….
3kV
Output Inductor
……………………………………… 1.0uH
Thermal Information
Thermal Resistance, Junction to Ambient (7) ………… 40 °C/W
Thermal Resistance, Junction to Case …………… 7 °C/W
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:
(7)
(8)
Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.
Tested according to JEDEC standard JESD22-A114-B.
(9) Due to parasitic board inductance, the transient LX pin voltage at the point of measurement may appear larger than that which exists on silicon. The device is
designed to tolerate the short duration transient voltages that will appear on the LX pin due to the deadtime diode conduction, for inductor currents up to the
current limit setting of the device.
Electrical Characteristics
Unless specified: PVIN= AVIN= 5.0V, VOUT= 1.50V, C IN = 22μF, C OUT = 2 x 22μF; L= 1.0μH; -40°C≤ T J ≤ +125 °C; Unless otherwise noted typical values are T A = +25 °C.
Parameter
Symbol
Conditions
Rising AVIN, PVIN=AVIN
Min
2.70
Typ
2.80
Max
2.90
Units
V
Under-Voltage Lockout
UVLO
Hysteresis
300
mV
Output Voltage Tolerance (10)
ΔV OUT
PVIN= AVIN= 2.9 – 5.5V; I OUT =0A
-1.25
+1.25
%
Current Limit
Supply Current
Shutdown Current
High Side Switch Resistance (11)
Low Side Switch Resistance (11)
L X Leakage Current (11)
Load Regulation
Oscillator Frequency
I LIMIT
I Q
I SHDN
R DSON_P
R DSON_N
I LK(LX)
ΔV LOAD-REG
f OSC
Peak LX current
No load, MODE= High
No load, MODE= Low
EN= AGND
I LX = 100mA, T J = 25 °C
I LX = -100mA, T J = 25 °C
PVIN= AVIN= 5.5V; LX= 0V; EN= AGND
PVIN= AVIN= 5.5V; LX= 5.0V; EN= AGND
PVIN= AVIN= 5.0V, MODE=Hi, I OUT =1mA – 4A
5.0
-20
1.275
6.0
12
100
1
50
35
1
-1
±0.3
1.5
7.0
10
10
1.725
A
mA
μA
μA
mΩ
μA
%
MHz
Soft-Start Charging Current (11)
I SS
+5
μA
Foldback Holding Current
? 2010 Semtech Corp.
I CL_HOLD
Average LX Current
3
1
A
www.semtech.com
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