参数资料
型号: SI9145BY-E3
厂商: Vishay Siliconix
文件页数: 1/14页
文件大小: 0K
描述: IC REG CTRLR BST PWM VM 16-SOIC
标准包装: 500
PWM 型: 电压模式
输出数: 1
频率 - 最大: 2MHz
占空比: 100%
电源电压: 2.7 V ~ 7 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -25°C ~ 85°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 散装
Product is End of Life 3/2014
Si9145
Vishay Siliconix
Low-Voltage Switchmode Controller
DESCRIPTION
FEATURES
The Si9145 switchmode controller IC is ideally suited for high
efficiency dc/dc converters in low input voltage systems. Oper-
ation is guaranteed down to 2.7 V, with a minimum start-up volt-
age of 3.0 V making the Si9145 ideal for use with NiCd, NMH,
and lithium ion battery packs. A mode select pin allows the out-
put driver polarity to be programmed allowing the device to
function as a step-up or step-down converter.
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2.7 V to 7 V Input Operating Range
Voltage-Mode PWM Control
High-Speed, Source-Sink Output Drive (200 mA)
Internal Oscillator (up to 2 MHz)
Standby Mode
0 - 100 % Controllable Maximum Duty-Cycle 2.7 V to 7 V
Input Operating Range
Features include a precision bandgap reference, a wide band-
width error amplifier, a 2 MHz oscillator, an input voltage moni-
tor with standby mode and a 200 mA output driver.
Supply current in normal operation is typically 1.1 mA and
250 μA in standby mode.
The Si9145 implements conventional voltage mode control.
The maximum duty cycle in boost mode can be limited by volt-
age on D MAX /SS pin. Frequency can be externally pro-
grammed by selection of R OSC and C OSC .
The Si9145 is available in both standard and lead (Pb)-free 16-
pin SOIC and TSSOP packages and is specified over the
industrial temperature range (- 25 °C to 85 °C).
FUNCTIONAL BLOCK DIAGRAM
? 0 - 100 % Controllable Maximum Duty-Cycle
V DD
UVLO SET
UVLO
1.5 V Reference
Generator
V REF
V UVLO
Temp
Sense
S
OTS
ENABLE
R
MODE SELECT
D MAX /SS
+
V S
COMP
NI
FB
+
-
Error Amp
-
+
Logic
Control
Driver
OUTPUT
P GND
C OSC
-
Oscillator
GND
R OSC
Pentium TM is a trademark of Intel Corporation. PowerPC TM is a trademark of IBM.
Document Number: 70021
S-40710-Rev. K, 19-Apr-04
www.vishay.com
1
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