参数资料
| 型号： | SC196ULTRT |
| 厂商： | Semtech |
| 文件页数： | 7/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 10MLPD |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.5 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-UFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD-UT（3x3） |
| 产品目录页面： | 1357 (CN2011-ZH PDF) |
| 其它名称： | SC196ULDKR |
SC196
POWER MANAGEMENT
Applications Information
SC196 Detailed Description
The SC196 is a synchronous step-down Pulse Width
Modulated (PWM), DC-DC converter utilizing a 1MHz
PRELIMINARY
Table 1 — Recommended ADJ Resistor Combinations
V OUT (V) R FB2 (k Ω ) R FB1 (k Ω )
? xed-frequency current mode architecture. The device
is designed to operate in a ? xed-frequency PWM mode
across the full load range and can enter Power Save Mode
(PSAVE), utilizing Pulse Frequency Modulation (PFM) at
light loads to maximize ef ? ciency.
Operation
During normal operation, the PMOS MOSFET is activated
on each rising edge of the internal oscillator. Current
feedback for the switching regulator uses the PMOS
current path, and it is ampli ? ed and summed with
the internal slope compensation network. The voltage
feedback loop uses an external feedback divider. The on-
time is determined by comparing the summed current
feedback and the output of the error ampli ? er. The period
is set by the onboard oscillator or by an external clock
attached to the SYNC/PWM pin.
The SC196 has an internal synchronous NMOS recti ? er
and does not require a Schottky diode on the LX pin.
1
1.1
1.2
1.3
1.5
1.6
1.7
1.8
1.875
2.5
2.8
3
3.3
3.6
3.8
200
200
200
200
178
200
178
178
178
200
178
178
100
100
100
200
240
280
320
357
442
432
464
487
806
820
887
560
620
665
R FB 1
OutputVoltageSelection
The output voltage can be programmed using a resistor
network connected from VOUT to ADJ to GND. The
combined resistance of the divider chain should be
greater than 10K Ω and less than 1M Ω . Table 1 lists
appropriate resistors which limit the bias current required
of the external feedback resistor chain and ensuring good
noise immunity.
The output voltage can be adjusted between less than
0.8V and V IN . The output voltage formula is:
V OUT 0 . 5 1
R FB 2
V OUT = output voltage (V)
R FB1 = feedback resistor from VOUT to ADJ ( Ω )
R FB2 = feedback resistor from ADJ to GND ( Ω )
Resistors with 1% or better tolerance are recommended
to ensure voltage accuracy.
Continuous Conduction & Oscillator Synchronization
The SC196 is designed to operate in continuous
conduction, ? xed-frequency mode. When the SYNC/PWM
pin is tied high the part runs in PWM mode using the
internal oscillator. The part can be synchronized to an
external clock by driving a clock signal into the SYNC/
PWM pin. The part synchronizes to the rising edge of the
clock.
Protection Features
The SC196 provides the following protection features:
? Thermal Shutdown
? Current Limit
? Over-Voltage Protection
? Soft-Start
Thermal Shutdown
The device has a thermal shutdown feature to protect the
SC196 if the junction temperature exceeds 145°C. In
thermal shutdown, the on-chip power devices are disabled,
effectively tri-stating the LX output. Switching will resume
when the temperature drops by 10°C. During this time,
? 2007 Semtech Corp.
7
www.semtech.com
相关PDF资料 |
PDF描述 |
|---|---|
| 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 |
| SC2446ITETRT | IC SYNC STEP DOWN CTRLR 28-TSSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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) |
| SC197EVB | 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 |
| SC197ULTRT | 制造商:Semtech Corporation 功能描述:Conv DC-DC Single Step Down 2.9V to 5.5V 18-Pin MLPQ-UT EP T/R 制造商:Semtech Corporation 功能描述:IC DC-DC CONV 3.5MHz MLPQ-18 制造商:Semtech Corporation 功能描述:SC197 Series 0.8 V 500 mA Dual Channel Step-Down Regulator - MLPQ-UT-18 制造商:Semtech Corporation 功能描述:IC, DC-DC CONV, 3.5MHz, MLPQ-18; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:3.3V; Output Current:500mA; No. of Pins:18; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:18-MLPQ |
| SC198 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Dual DC-DC Buck Converter with High Current Capability |
发布紧急采购，3分钟左右您将得到回复。