参数资料
| 型号： | SC493ULTRT |
| 厂商： | Semtech |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM MLPQ-20 |
| 标准包装： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 3 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-MLPQ |
| 包装： | 标准包装 |
| 其它名称： | SC493ULTRTDKR |
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SC493
POWER MANAGEMENT
Features
EcoSpeed TM Step-down Controller
with I 2 C Interface
Description
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Input supply voltage range — 3.0V to 28V
Controller supply voltage range — 3.0V to 5.5V
All ceramic solution enabled
I 2 C interface
Output voltage fine adjust control
Output voltage margining
Supports dynamic voltage transitions via the I 2 C
interface
Programmable power-on delay time and soft-start time
EcoSpeed TM architecture with pseudo fixed-frequency
adaptive on-time control
Switching frequency programmable up to 1MHz
Selectable power save, including ultrasonic
Non-synchronous start-up into pre-biased loads
Over-voltage/under-voltage fault protection
Smart power save
Power good Output
Smart drive TM
Status register monitoring device operation
Ultra-thin package — 3 x 3 x 0.6 (mm), 20 pin MLPQ-UT
Lead-free and halogen-free
WEEE and RoHS compliant
The SC493 is a synchronous EcoSpeed TM buck power supply
controller. It features an I 2 C interface and a bootstrap switch in
a space-saving MLPQ 3X3-20 pin package. The SC493 uses
Semtech’s advanced patented adaptive on-time control archi-
tecture to provide excellent light load efficiency and fast tran-
sient response with small external components.
The I 2 C interface is used to program the output voltage
offset, the power-on delay time, the soft-start time, the
power save operating mode, and it can enable/disable the
controller. Additionally, a status register provides informa-
tion on device state and faults.
The controller is capable of operating with all ceramic solu-
tions and switching frequencies up to 1MHz. The program-
mable frequency and selectable power save mode offer the
flexibility to optimize the controller for high efficiency and
small size. The power save mode can be enabled to maximize
efficiency over the entire load range (PSAVE), or switched to
ultrasonic mode to set the minimum frequency to the desired
value (UPSAVE). Power save mode can be disabled for opera-
tion in continuous conduction mode at all loads.
Applications
Additional features include output voltage margining,
cycle-by-cycle current limit, output voltage soft-start, over
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Printers
Computer peripherals
and under-voltage protection, controller over-tempera-
ture protection, and output voltage soft-shutdown when
disabled. The SC493 also provides a power good output.
Typical Application Circuit
VIN
VDD
R1 R2 R3
BST
RILIM
Q1
CIN
EN
PGD
SCL
SDA
EN
PGD
SCL
SDA
A0
A1
SC493
LX
DL
CBST
Q2
L
R4
COUT
VOUT
A2
R5
US Patent: 7,714,547 B2
June 10, 2010
? 2010 Semtech Corporation
1
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