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L4957A 데이터시트 PDF




STMicroelectronics에서 제조한 전자 부품 L4957A은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


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부품번호 L4957A 기능
기능 UP TO 5A ULDO LINEAR REGULATOR
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L4957A 데이터시트, 핀배열, 회로
® L4957A
UP TO 5A ULDO LINEAR REGULATOR
PRODUCT PREVIEW
1.5V, 1.8V, 2.5V AND 3.3V FIXED OUTPUT
VOLTAGE
3V TO 14V INPUT VOLTAGE RANGE
200mRdson TYPICAL @ Tj = 125°C
0.6V max. DROP-OUT AT 2A
EXCELLENT LOAD REGULATION
0.6mA QUIESCENT CURRENT AT ANY LOAD
SHORT CIRCUIT PROTECTION
THERMAL SHUTDOWN
APPLICATIONS
MOTHER BOARDS
PROCESSOR I/O & SUPPLIES
LOW VOLTAGE MEMORY & CHIP SET SUP-
PLIES
GRAPHIC & SOUND CARDS
LOW VOLTAGE LOGIC SUPPLIES
POST REGULATOR FOR SMPS
DESCRIPTION
The L4957A devices are Ultra Low Drop Output
linear regulators with an internal N-channel MOS
of 200mparticulary suitable for low voltage/low
dropout applications.
Operating with a input voltage from 3V to 14V
they are capable to deliver up to 5A.
The devices are ideal for use as one of the sup-
MULTIPOWER BCD TECHNOLOGY
3
1
Versawatt TO-220
D2PAK
ORDERING NUMBERS:
L4957AV1.5
L4957AV1.8
L4957AV2.5
L4957AV3.3
L4957AD1.5
L4957AD1.8
L4957AD2.5
L4957AD3.3
plies required by processor, for example they are
the cost effective and efficient solution for conver-
sion from 3.3V (rail bus) to 2.5V @ 2.5A or to
1.5V with high current rating.
Fast response transient minimise the output ca-
pacitor value. A minimum of 22µF assures the
stability in all load conditions.
The on-chip trimming technique offers a tighter
voltage reference tolerance (with ± 2% including
line and load variation) beside to ensure a con-
trolled short circuit current. Thermal shutdown
provides protection against overload conditions
that creates excessive junction temperature.
TYPICAL APPLICATION
3V to 14V
IN
1
OUT
3
L4957A
VOUT
C1
2
GND
C2
D00IN1107A
May 2000
This is preliminary information on a new product now in development. Details are subject to change without notice.
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L4957A pdf, 반도체, 판매, 대치품
L4957A
Figure 3: Maximum Output Current vs. Junction
Temperature
Output Current [A]
10
9
8
7
6
5
4
(Vin-Vout) > 2V
3
pin 2 = G ND
2
1
0
-40 -20 0 20 40 60 80 100 120 140 160
Tj [°C]
*P ulsed te cniq ue h as been used
Figure 4: DC Operating Area
Output Current [A]
8
Vin>2.8 V
7 Tj=1 25C
C ur re n t L im ita tio n
Tc =2 5 °C
P dmax= 40 W
6
R dso n
lim it
5
P o w e r D is s ip ation L im it
4 Tc = 7 0°C
P dmax= 22 W
3
D C Operating A rea
2
1
0
01 2 3 4 56 78
(Vin - Vout) [V]
Figure 5: Ripple Rejection vs. Frequency
R ip p le R e jec tio n [d B ]
100
90
V r ip ple= 3V p-p V r ipple = 0.5 V p- p
80
70
60
50
40
C in= 2 2u F
3 0 C ou t=2 2u F
V ou t= 1 .5V
20
V in m in = 3V
Io ut= 5A
10
0 10
100 1 k 10k
F req u ency [H z ]
100k
Figure 7: Maximum Output Current vs. Drop-Out
Voltage
Io [A ]
5
4.5 Tj = 25°C
4 T j = 1 25°C
3.5 T j = 1 00°C
3
2.5
2
1.5
1
m a ximu m Ro n limits
0.5
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
V = V in - Vo
4/7
Figure 6: Output Voltage vs. Output Current.
(VOUT = 1.5V)
VOUT
(V)
D00IN1109
6.3 IOUT(A)

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L4957A 전자부품, 판매, 대치품
L4957A
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
© 2000 STMicroelectronics – Printed in Italy – All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco -
Singapore - Spain - Sweden - Switzerland - United Kingdom - U.S.A.
http://www.st.com
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