参数资料
| 型号： | SC196AMLTRT |
| 厂商： | Semtech |
| 文件页数： | 8/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.5A 10MLP |
| 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： | 1V，1.05V，1.2V，1.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 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： | 10-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLP（3x3） |
| 其它名称： | SC196AMLDKR |
SC196A
POWER MANAGEMENT
Applications Information (Cont.)
Power Save Mode Operation
The PSAVE mode may be selected by tying the SYNC/
PWM pin to GND. Selecting PSAVE mode will enable the
SC196A to automatically activate/deactivate operation
at light loads, maximizing ef ? ciency across the full load
range. The SC196A automatically detects the load current
at which it should enter PSAVE mode. The SC196A is
optimized to track maximum ef ? ciency with respect to
V IN .
In PSAVE mode, V OUT is driven from a lower level to an
upper level by a switching burst. Once the upper level has
been reached, the switching is stopped and the quiescent
current is reduced. V OUT falls from the upper to lower levels
in this low current state as the load current discharges
the output capacitor. The burst-to-off period in PSAVE will
decrease as the load current reduces.
The PSAVE switching burst frequency is controlled so that
the inductor current ripple is similar to that in PWM mode.
The minimum switching frequency during this period is
limited to 650kHz.
The SC196A automatically detects when to exit PSAVE
PRELIMINARY
PSAVE levels are set high to minimize the undershoot
when exiting PSAVE. The lower PSAVE comparator level
is set +0.7% above V OUT , and the upper comparator level
at +1.5% above V OUT with the exit threshold at -2% below
V OUT .
If PSAVE operation is required, then a 22 μ F output
capacitor must be used.
100% Duty Cycle Operation
The 100% duty cycle mode may be selected by connecting
the MODE pin high. This will allow the SC196A to maintain
output regulation under low input voltage/high output
voltage conditions.
In 100% duty cycle operation, as the input supply drops
toward the output voltage, the PMOS on-time increases
linearly above the maximum value in ? xed-frequency
operation until the PMOS is active continuously. Once
the PMOS is switched on continuously, the output voltage
tracks the input voltage minus the voltage drop across
the PMOS power device and inductor according to the
following relationship:
mode by monitoring V OUT . For the SC196A to exit PSAVE
mode, the load must be increased, causing V OUT to
decrease until the power save exit threshold is reached.
where,
V OUT
V IN I OUT (R DSP R IND )
Power Save Operation
V OUT
V IN
I OUT
R DSP
R IND
= Output voltage
= Input voltage
= Output current
= PMOS switch ON resistance
= Series resistance of the inductor
BURST
OFF
Higher Load
Applied
Minimum V IN for Fixed Frequency Operation Vs. R IND
1.5%
0.7%
PSAVE Mode at Light Load
PWM Mode at Medium/
3
2.95
V OUT
High Load
2.9
-2%
2.85
2.8
Inductor Current
2.75
V OUT = 1.8V
I OUT =1A
2.7
0A
Time
0.05
0.1
0.15 0.2
Inductor DC R esistance ( Ω )
0.25
0.3
? 2008 Semtech Corp.
8
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| SC196ULTRT | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
| SC198AMLTRT | IC REG BUCK SYNC PROG .8A 20MLPQ |
| SC198MLTRT | IC REG BUCK SYNC PROG .6A 20MLPQ |
| SC2440TETRT | IC REG BUCK 2A DL 16TSSOP |
| SC2443MLTRT | IC DUAL SYNC STP-DN CTRLR 24MLPQ |
相关代理商/技术参数 |
参数描述 |
|---|---|
| SC196EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:1.5A Synchronous Buck Converter with Integrated Power Devices |
| SC196UL.TRT | 制造商:SEMTECH 功能描述:I.C. |
| SC196ULTRT | 功能描述:IC REG BUCK SYNC ADJ 1.5A 10MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| SC197 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:3.5MHz, 500mA Synchronous Dual Step-Down DC-DC Regulator |
| SC1972 | 制造商:MITSUBISHI 制造商全称:Mitsubishi Electric Semiconductor 功能描述:NPN EPITAXIAL PLANAR TYPE(for RF power amplifiers on VHF band Mobile radio applications) |
发布紧急采购，3分钟左右您将得到回复。