参数资料
| 型号： | SC1485ITSTRT |
| 厂商： | Semtech |
| 文件页数： | 4/27页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 28-TSSOP |
| 标准包装： | 1 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 占空比： | 90% |
| 电源电压： | 1.8 V ~ 25 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 28-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC1485ITSDKR |
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NOT RECOMMENDED FOR NEW DESIGN
SC1485
POWER MANAGEMENT
Electrical Characteristics (Cont.)
Test Conditions: V BAT = 15V, EN/PSV1=EN/PSV2 = 5V, VCCA1 = VDDP1 = VCCA2 = VDDP2 = 5V, V OUT1 = V OUT2 =1.25V, R TON1 = R TON2 = 1M ?
P a r a m e t e r
C o n d i t i o n s
2 5 ° C
- 4 0 ° C t o 1 2 5 ° C
U n i t s
M i n
T y p
M a x
M i n
M a x
F a u l t P r o t e c t i o n ( C o n t . )
P G D F a u l t D e l a y
F B f o r c e d o u t s i d e P G D w i n d o w
5
μ s
V C C A U n d e r v o l t a g e T h r e s h o l d
O v e r T e m p e r a t u r e L o c k o u t
F a l l i n g ( 1 0 0 m V H y s t e r e s i s )
1 0 ° C H y s t e r e s i s
4 . 0
1 6 5
3 . 7
4 . 3
V
° C
I n p u t s / O u t p u t s
L o g i c I n p u t L o w V o l t a g e
L o g i c I n p u t H i g h V o l t a g e
L o g i c I n p u t H i g h V o l t a g e
E N / P S V I n p u t R e s i s t a n c e
E N / P S V l o w
E N H i g h , P S V l o w ( F l o a t i n g )
E N / P S V h i g h
R P u l l u p t o V C C A
R P u l l d o w n t o V S S A
2 . 0
1 . 5
1 . 0
3 . 1
1 . 2
V
V
V
M ?
S o f t S t a r t
S o f t - S t a r t R a m p T i m e
U n d e r - V o l t a g e B l a n k T i m e
E N / P S V h i g h t o P G D h i g h
E N / P S V h i g h t o U V h i g h
4 4 0
4 4 0
c l k s ( 3 )
c l k s ( 3 )
G a t e D r i v e r s
S h o o t - T h r o u g h D e l a y ( 4 )
D H o r D L r i s i n g
3 0
n s
D L P u l l - D o w n R e s i s t a n c e
D L S i n k C u r r e n t
D L P u l l - U p R e s i s t a n c e
D L S o u r c e C u r r e n t
D H P u l l - D o w n R e s i s t a n c e
D H P u l l - U p R e s i s t a n c e ( 5 )
D H S i n k / S o u r c e C u r r e n t
D L l o w
D L = 2 . 5 V
D L h i g h
D L = 2 . 5 V
D H l o w , B S T - L X = 5 V
D H h i g h , B S T - L X = 5 V
D H = 2 . 5 V
0 . 8
3 . 1
2
1 . 3
2
2
1 . 3
1 . 6
4
4
4
?
A
?
A
?
?
A
Notes:
(1) When the inductor is in continuous and discontinuous conduction mode, the output voltage will have a DC
regulation level higher than the error-comparator threshold by 50% of the ripple voltage.
(2) Using a current sense resistor, this measurement relates to PGND minus the voltage of the source on the low-
side MOSFET. These values guaranteed by the ILIM Source Current and Current Comparator Offset tests.
(3) clks = Switching cycles.
(4) Guaranteed by design. See Shoot-Through Delay Timing Diagram on Page 6.
(5) Semtech’s SmartDriver TM FET drive first pulls DH high with a pullup resistance of 10 ? (typ.) until LX = 1.5V (typ.).
At this point, an additional pullup device is activated, reducing the resistance to 2 ? (typ.). This negates the need for
an external gate or boost resistor.
? 2005 Semtech Corp.
4
www.semtech.com
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