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SC1405D
POWER MANAGEMENT
Pin Configuration
Ordering Information
Top View
D e v i c e
S C 1 4 0 5 D I T S T R T
P a c k a g e
T S S O P - 1 4
T e m p R a n g e ( T J )
- 4 0 ° t o 1 2 5 ° C
Notes:
(1) Only available in tape and reel packaging. A reel
contains 2500 devices.
(2) Lead free product. This product is fully WEEE and
RoHS compliant.
(14-Pin TSSOP)
Pin Descriptions
P i n #
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
P i n N a m e
O V P _ S
E N
G N D
C O
S _ M O D
D E L A Y _ C
P R D Y
V C C
B G
P G N D
D S P S _ D R
D R N
T G
B S T
P i n F u n c t i o n
O v e r v o l t a g e p r o t e c t i o n s e n s e . E x t e r n a l s c a l i n g r e s i s t o r s r e q u i r e d t o s e t p r o t e c t i o n
t h r e s h o l d .
W h e n h i g h , t h i s p i n e n a b l e s t h e i n t e r n a l c i r c u i t r y o f t h e d e v i c e . W h e n l o w , T G , B G , a n d
P R D Y a r e f o r c e d l o w a n d t h e s u p p l y c u r r e n t ( 5 V ) i s l e s s t h a n 1 0 μ A .
L o g i c G N D .
T T L - l e v e l i n p u t s i g n a l t o t h e M O S F E T d r i v e r s .
W h e n l o w , t h i s s i g n a l f o r c e s B G t o b e l o w , t r i g g e r i n g a s y n c h r o n o u s o p e r a t i o n . W h e n
h i g h , B G i s n o t a f u n c t i o n o f t h i s s i g n a l .
T h e c a p a c i t a n c e c o n n e c t e d b e t w e e n t h i s p i n a n d G N D s e t s t h e a d d i t i o n a l p r o p a g a t i o n
d e l a y f o r B G g o i n g l o w t o T G g o i n g h i g h . T o t a l p r o p a g a t i o n d e l a y = 2 0 n s + 1 n s / p F . I f n o
c a p a c i t o r i s c o n n e c t e d , t h e p r o p r a g a t i o n d e l a y = 2 0 n s .
T h i s p i n i n d i c a t e s t h e s t a t u s o f V C C . W h e n V C C i s l e s s t h a n t h e U V L O t h r e s h o l d , t h i s
o u t p u t i s d r i v e n l o w . W h e n V C C i s g r e a t e r t h a n o r e q u a l s t o t h e U V L O t h r e s h o l d t h i s
o u t p u t g o e s h i g h .
I n p u t s u p p l y o f 5 - 8 V . A . 2 2 - 1 μ F c e r a m i c c a p a c i t o r s h o u l d b e c o n n e c t e d f r o m V C C t o
P G N D v e r y c l o s e t o t h e c h i p .
O u t p u t d r i v e f o r t h e s y n c h r o u n o u s ( b o t t o m ) M O S F E T .
P o w e r g r o u n d . C o n n e c t t o t h e s y n c h r o n o u s F E T s o u r c e p i n ( p o w e r g r o u n d ) .
D y n a m i c S e t P o i n t S w i t c h D r i v e . T T L l e v e l o u t p u t s i g n a l . W h e n S - M O D i s h i g h , t h i s p i n
f o l l o w s t h e B G d r i v e r p i n v o l t a g e .
T h i s p i n c o n n e c t s t o t h e j u n c t i o n o f t h e s w i t c h i n g a n d s y n c h r o n o u s M O S F E T ' s . T h i s p i n
c a n b e s u b j e c t e d t o a - 2 V m i n i m u m r e l a t i v e t o P G N D w i t h o u t a f f e c t i n g o p e r a t i o n .
O u t p u t g a t e d r i v e f o r t h e s w i t c h i n g ( h i g h - s i d e ) M O S F E T .
B o o t s t r a p p i n . A c a p a c i t o r i s c o n n e c t e d b e t w e e n B S T a n d D R N p i n s t o d e v e l o p t h e
f l o a t i n g b o o t s t r a p v o l t a g e f o r t h e h i g h - s i d e M O S F E T . T h e c a p a c i t o r v a l u e i s t y p i c a l l y
b e t w e e n 0 . 1 μ F a n d 1 μ F ( c e r a m i c ) .
NOTE:
(1) All logic level inputs and outputs are open collector TTL compatible.
? 2005 Semtech Corp.
6
www.semtech.com
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