参数资料
型号: SC4517AIMSTRT
厂商: Semtech
文件页数: 5/15页
文件大小: 0K
描述: IC REG BUCK ADJ 1.5A 8MSOP
标准包装: 1
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 可调
PWM 型: 电流模式
频率 - 开关: 1.25MHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 8-TSSOP,8-MSOP(0.118",3.00mm 宽)
包装: 标准包装
供应商设备封装: 8-MSOP
其它名称: SC4517AIMSDKR
SC4517A
POWER MANAGEMENT
Pin Configurations
Ordering Information
TOP VIEW
P a r t N u m b e r ( 1 ) ( 2 ) ( 3 )
P a c k a g e
BST
IN
SW
GND
1
2
3
4
8
7
6
5
SYNC
COMP
FB
EN
S C 4 5 1 7 A I M S X X T R T
S C 4 5 1 7 A I M S T R T
S C 4 5 1 7 A I M L X X T R T
S C 4 5 1 7 A I M L T R T
M S O P - 8
M L P D - 8
S C 4 5 1 7 A E V B
E v a l u a t i o n B o a r d
(8 Pin MSOP)
TOP VIEW
Notes:
(1) Where XX denotes voltage options. Available
voltages are: 1.8V (18), 2.5V (25), 3.3V (33) and 5.0V
(50). Leave blank for adjustable voltage option.
(2) Only available in tape and reel packaging. A reel
contains 2500 for MSOP and 3000 for MLP devices.
(3) Lead-free product. This product is fully WEEE and
RoHS compliant.
(8 Pin MLPD)
Pin Descriptions
P i n #
P i n N a m e P i n F u n c t i o n
1
2
3
4
5
6
7
8
B S T
I N
S W
G N D
E N
F B
C O M P
S Y N C
T h i s p i n p r o v i d e s p o w e r t o t h e i n t e r n a l N P N s w i t c h . T h e m i n i m u m t u r n o n v o l t a g e f o r t h i s s w i t c h i s
2 . 7 V .
P i n I N d e l i v e r s a l l p o w e r r e q u i r e d b y c o n t r o l a n d p o w e r c i r c u i t r y . T h i s p i n s e e s h i g h d i / d t d u r i n g
s w i t c h i n g a c t i o n s o f t h e s w i t c h . A d e c o u p l i n g c a p a c i t o r s h o u l d b e a t t a c h e d t o t h i s p i n a s c l o s e a s
p o s s i b l e .
P i n S W i s t h e e m i t t e r o f t h e i n t e r n a l s w i t c h . T h e e x t e r n a l f r e e w h e e l i n g d i o d e s h o u l d b e c o n n e c t e d a s
c l o s e a s p o s s i b l e t o t h i s p i n .
A l l v o l t a g e s a r e m e a s u r e d w i t h r e s p e c t t o t h i s p i n . T h e d e c o u p l i n g c a p a c i t o r a n d t h e f r e e w h e e l i n g
d i o d e s h o u l d b e c o n n e c t e d t o G N D a s s h o r t a s p o s s i b l e .
T h i s i s t h e c h i p e n a b l e i n p u t . T h e r e g u l a t o r i s s w i t c h e d o n i f E N i s h i g h , a n d i t i s o f f i f E N i s l o w . T h e
r e g u l a t o r i s i n s t a n d b y m o d e w h e n E N i s l o w , a n d t h e i n p u t s u p p l y c u r r e n t i s r e d u c e d t o a f e w
m i c r o a m p e r e s . I t n e e d s t o b e p u l l e d u p t o V i n i f n o t u s e d .
F e e d b a c k i n p u t f o r a d j u s t a b l e o u t p u t c o n t r o l l e r s . F o r f i x e d o u t p u t c o n t r o l l e r s , t h i s p i n s h o u l d b e d i r e c t l y
c o n n e c t e d t o t h e o u t p u t s i n c e t h e v o l t a g e d i v i d e r s h a v e b e e n i n t e g r a t e d i n t o t h e c h i p s ( S C 4 5 1 7 A -
X X ) .
T h i s i s t h e o u t p u t o f t h e i n t e r n a l e r r o r a m p l i f i e r a n d i n p u t o f t h e p e a k c u r r e n t c o m p a r a t o r . A
c o m p e n s a t i o n n e t w o r k i s c o n n e c t e d t o t h i s p i n t o a c h i e v e t h e s p e c i f i e d p e r f o r m a n c e .
T h i s i s s y n c h r o n o u s c o n t r o l p i n u s e d t o s y n c h r o n i z e t h e i n t e r n a l o s c i l l a t o r t o a n e x t e r n a l p u l s e c o n t r o l
s i g n a l . W h e n n o t u s e d , i t s h o u l d b e c o n n e c t e d t o G N D .
T H E R M A L P a d f o r h e a t s i n k i n g p u r p o s e . C o n n e c t t o g r o u n d p l a n e u s i n g m u l t i p l e v i a s . N o t e l e c t r i c a l l y c o n n e c t e d
P A D
( M L P D o n l y )
i n t e r n a l l y .
? 2006 Semtech Corp.
5
www.semtech.com
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