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参数资料
| 型号： | S-8338ABCA-P8T1G |
| 元件分类： | 稳压器 |
| 英文描述： | 0.16 A SWITCHING CONTROLLER, 1246.3 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, SON-8 |
| 文件页数： | 1/51页 |
| 文件大小： | 446K |
| 代理商： | S-8338ABCA-P8T1G |
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S-8337/8338 Series
www.sii-ic.com
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL
SWITCHING REGULATOR CONTROLLER
Seiko Instruments Inc., 2003-2010
Rev.4.0_00
Seiko Instruments Inc.
1
The S-8337/8338 Series is a CMOS step-up switching regulator which mainly consists of a reference voltage
circuit, an oscillator, an error amplifier, a PWM controller, an under voltage lockout circuit (UVLO), and a timer
latch short-circuit protection circuit. Because its minimum operating voltage is as low as 1.8 V, this switching
regulator is ideal for the power supply of an LCD or for portable systems that operate on a low voltage. The
internal oscillation frequency can be set up to 1.133 MHz, via the resistor connected to the ROSC pin.
With the S-8337 Series, the maximum duty ratio of PWM control can be controlled by the resistor connected to
the RDuty pin. With the S-8338 Series, the maximum duty ratio is fixed (to 88%). The phase compensation
and gain value can be adjusted according to the values of the resistor and capacitor connected to the CC pin.
Therefore, the operation stability and transient response can be correctly set for each application.
The
reference voltage accuracy is as high as 1.0 V
±1.5%, and any voltage can be output by using an external
output voltage setting resistor.
In addition, the delay time of the short-circuit protection circuit can be set by using the capacitor connected to
the CSP pin. If the maximum duty condition continues because of short-circuiting, the capacitor externally
connected to the CSP pin is charged, and oscillation stops after a specific time. This condition is cleared by
re-application of power or by setting the switching regulator (S-8338 Series) to the shutdown status. A ceramic
capacitor or a tantalum capacitor is used as the output capacitor, depending on the setting. This controller IC
allows various settings and selections and employs a small package, making it very easy to use.
Features
Low voltage operation:
1.8 V to 6.0 V
Oscillation frequency:
286 kHz to 1.133 MHz (selectable by external resistor)
Maximum duty:
47 to 88.5% (selectable by external resistor) (S-8337 Series)
Fixed to 88% typ. (S-8338 Series)
Reference voltage:
1.0 V
±1.5%
UVLO (under-voltage lockout) function:
Detection voltage can be selected from between 1.5 V and 2.3 V in 0.1 V steps.
Hysteresis width can be selected from between 0.1 V and 0.3 V in 0.1 V steps.
Timer latch short-circuit protection circuit:
Delay time can be set using an external capacitor.
Soft-start function:
Soft-start time can be selected in three steps, 10 ms, 15 ms, and 20 ms.
Phase compensation external setting:
Adjustable by connecting resistor and capacitor in series to GND.
Shutdown function:
S-8338 Series, shutdown current consumption: 1.0
μA max.
Lead-free, Sn 100%, halogen-free*1
*1. Refer to “
Product Name Structure” for details.
Applications
Power supplies for LCDs and CCDs
Power supplies for portable equipment
Packages
8-Pin SON(A)
8-Pin TSSOP
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相关代理商/技术参数 |
参数描述 |
|---|---|
| S-8338ABCB-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338ABDA-T8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEP-UP, 1.2 MHZ HIGH-FREQUENCY, PWM CONTROL - Tape and Reel |
| S-8338ACAC-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338ACBB-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338ACBC-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
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