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參數資料
| 型號： | 935269477115 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.3 A SWITCHING REGULATOR, 57.5 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | 1.50 MM, PLASTIC, MO-178, SOT-25, SOT-23, SOP-5 |
| 文件頁數： | 20/20頁 |
| 文件大小： | 331K |
| 代理商： | 935269477115 |
Philips Semiconductors
Product data
SA57250-XX
CMOS switching regulator (PWM controlled)
2001 Aug 01
9
TECHNICAL DISCUSSION
General discussion
The SA57250-XX is a highly integrated boost-mode switching power
supply integrated circuit. Each device is set to provide a fixed output
voltage by having a fully compensated internal voltage feedback
loop. The SA57250-XX operates at a fixed frequency of 50 kHz and
can operate from a single alkaline cell (0.9 V) or up to 9 V.
The SA57250-XX has an internal common-source power switching
MOSFET that provides the PWM signal to the boost inductor. The
voltage error amplifier for maintaining a fixed output voltage, the
oscillator, and a PWM generator are all in the package.
The SA57250-XX can be turned off via an ON/OFF pin, thus
allowing the system to unpower portions of the circuitry for added
power savings.
SL01463
2
VREF
5
4
SA57250-XX
ON/OFF
GND
SW
FB
PWM CONTROL
SOFT START
1
R
VDD
Figure 24. Functional diagram.
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