参数资料
| 型号： | SC286ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 4A 28MLPQ |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 3.3 V |
| 输入电压： | 2.9 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1.6MHz |
| 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： | 28-UFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 28-MLPQ（4x4） |
| 其它名称： | SC286ULDKR |
SC286
POWER MANAGEMENT
Features
Dual Channel 4A Synchronous
Step-Down Regulator
Description
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Input Voltage Range — 2.9 to 5.5V
Output Voltage Range — 0.8V to 3.3V
Output Current — up to 4A for each channel
Ultra-Small Footprint — <1mm Height Solution
Switching Frequency — 1.6MHz
Automatic Power Save Mode
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
Duty-Cycle Low Dropout Operation — 100%
Shutdown Current — <1μA
Externally Programmable Soft Start Time
Power Good indicator
Input Under-Voltage Lockout
The SC286 is a dual channel 4A synchronous step-down
regulator designed to operate with an input voltage
range of 2.9V to 5.5V. Each channel offers fifteen pre-
determined output voltages via separate control pins
programmable from 0.8 to 3.3 Volts. The control pins
allow for on-the-fly voltage changes, enabling system
designers to implement dynamic power savings. The
device is also capable of adjusting output voltage via an
external resistor divider.
The SC286 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the device operates in PWM mode with fixed 1.6MHz
oscillator frequency, allowing the use of small surface
mount external components. As the load decreases, the
regulator will transition into Power Save mode maintain-
ing high efficiency.
? Output Over-Voltage, Current Limit Protection
? Over-Temperature Protection
? Thermally Enhanced 4 x 4 x 0.6 (mm)
MLPQ-UT28 package
? Lead-free, Halogen free, and RoHS/WEEE compliant
Applications
Connecting the control pins to logic low forces the device
into shutdown mode reducing the supply current to less
than 1μA. Connecting any of the control pins to logic high
enables the converter and sets the output voltage accord-
ing to Table 1. Other features include under-voltage
lockout, programmable soft-start to limit in-rush current,
power good indicator, over-temperature protection, and
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Routers and Network Cards
LCD TV
Office Automation
Printers
output short circuit protection.
The SC286 is available in a thermally-enhanced, 4 x 4 x 0.6
(mm) MLPQ-UT28 package and has a rated temperature
range of -40 to +85°C.
C INA
22μF
C INB
22μF
SC286
TypicalApplicationCircuit
V INA
R PGOODA
100k Ω
V INB
R PGOODB
100k Ω
R AVINA 1 Ω
C AVINA 0.1μF
R AVINB 1 Ω
C AVINB 0.1μF
PVINA
AVINA
AGNDA
PGOODA
PVINB
AVINB
AGNDB
LXA
VOUTA
LXB
VOUTB
SSA
PGNDA
SSB
PGNDB
L A 1.0μH
L B 1.0μH
C SSA
1nF
C SSB
1nF
C OUTA
47μF
C OUTB
47μF
V OUTA
V OUTB
CTL0A
CTL1A
CTL2A
CTL3A
PGOODB
CTL0A
CTL1A
CTL2A
CTL3A
CTL0B
CTL1B
CTL2B
CTL3B
CTL0B
CTL1B
CTL2B
CTL3B
Revision 2.0
? 2011 Semtech Corporation
1
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