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参数资料
| 型号： | S-8338ACAA-T8T1 |
| 元件分类： | 稳压器 |
| 英文描述： | 0.16 A SWITCHING CONTROLLER, 1133 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | TSSOP-8 |
| 文件页数： | 1/49页 |
| 文件大小： | 554K |
| 代理商： | S-8338ACAA-T8T1 |
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Rev.2.1_01
STEP-UP, 1.2 MHz HIGH-FREQUENCY, PWM CONTROL
SWITCHING REGULATOR CONTROLLERS
S-8337/8338 Series
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
A max.
Small package:
8-pin SON(A), 8-pin TSSOP
Applications
Power supplies for LCDs and CCDs
Power supplies for portable equipment
Packages
Drawing code
Package name
Package
Tape
Reel
8-Pin SON(A)
PN008-A
8-Pin TSSOP
FT008-A
FT008-E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| S-8338ACBC-T8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
| S-8338ACCA-P8T1G | 制造商:Seiko Instruments Inc (SII) 功能描述:STEPUP1.2MHZ PWM SWR |
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