參數(shù)資料
型號： LX1668CPWT
廠商： MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類： 穩(wěn)壓器
英文描述： Analog IC
中文描述： 1 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20
封裝： PLASTIC, TSSOP-20
文件頁數(shù)： 3/15頁
文件大?。?/td> 371K
代理商： LX1668CPWT
P
ROGRAMMABLE
M
ULTIPLE
O
UTPUT
DC:DC C
ONTROLLER
LX1668
P R O D U C T D A T A B O O K 1 9 9 6 / 1 9 9 7
3
Copyright 1999
Rev. 1.0 4/99
P
R O D U C T I O N
D
A T A
S
H E E T
ELECTRICAL CHARACTERISTICS
(
Unless otherwise specified, 4.75V < V
CC5
< 5.25V and 10.8V < V
CC12
< 13.2V, 0°C
≤
T
A
≤
70°C. Test conditions: V
CC3
= V
CC5
, V
CC5
= 5V, V
CC12
= 12V,
T = 25°C.
)
Reference & DAC
Initial Accuracy
Cumulative Regulation Accuracy
Timing
Off Time
Swicthing Frequency
Error Comparator / CS-
Input Bias Current
E
C
Delay to Output
Current Sense +
Parameter
Symbol
Test Conditions
V
CORE
(Less 40mV output adaptive positioning)
,
1.3V
≤
V
CORE
≤
35V, T = 25°C
1.3V
≤
V
CORE
≤
3.5V
OT
Freq
V
CORE
= 2.0V
V
CORE
= 1.3V to 3.5V
Input Resistance
Pulse By Pulse Current Limit
Current Sense Delay To Output
Output Drivers
Drive Rise Time, Fall Time
Drive High
Drive Low
UVLO and Soft-Start (SS)
V
CC5
Start-Up Threshold
Hysteresis
SS Resistor
SS Output Enable
Hiccup Duty Cycle
Supply Current
V
CC12
Dynamic Supply Current
Static Supply Current
R
CORE
V
CLP
0V < V
FB
= V
CORE
< 3.5V
Overdrive
≤
5mV
I
FB
1.0V < V
SS
= V
FB
< 3.5V
Overdrive
≤
5mV
T
RF
V
DH
V
DL
C
L
= 3000pF
I
SOURCE
= 20mA
I
SINK
= 20mA
V
ST
V
CC12
> 3.9V
R
SS
V
EN
DC
HIC
C
SS
= 0.1μF, V
DAC
= 2.00V, F
REQ
= 100Hz
I
CD
I
VCC12
I
VCC5
I
VCC3
Out Freq = 200kHz, C
L
= 3000pF, Synch., V
SS
> 0.5V
V
SS
< 0.5V
V
SS
< 0.5V
V
SS
< 0.5V
12V
5V
3.3V
Power Good / Over-Voltage Protection (OVP)
Threshold
(V
CORE
/ V
SET
) V
CORE
rising, V
OUT2
≥
2.0V
(V
CORE
/ V
SET
) V
CORE
falling, V
OUT2
≥
2.0V
Hysteresis
Power Good Voltage Low
Over-Voltage Threshold
OVP Sourcing Current
Fixed Linear Regulator (V
OUT2
)
Voltage Reference Tolerance
Regulation
Current Limit
Linear Regulator Controller
Voltage Reference Tolerance
Source Current
Sink Current
I
PWRGD
= 4mA
(V
CORE
/ V
SET
), V
CORE
rising
V
OVP
= 2.0V
Units
-1
+1
1.5
%
%
-1.5
LX1668
Typ.
Min.
Max.
2.4
250
μs
kHz
-0.3
100
-1
μA
ns
12
60
100
k
mV
ns
45
100
11
0.1
ns
V
V
10
3.9
4.2
0.10
18
0.5
10
4.6
V
V
k
V
%
0.4
24
6
13
0.4
mA
mA
mA
mA
9
18
2
108
90
110
91
2
0.5
117
60
111
92
%
%
%
V
%
mA
0.7
125
110
35
V
OUT2
= 2.5V, C
OUT
= 220μF
-10mA
≤
I
OUT2
≤
-150mA
V
OUT2
≤
2V
-2.3
-1
250
+2.0
+1
%
%
mA
VID Pins
Low Input
High Input
0.8
V
V
2.0
V
IL
V
IH
Internally pulled up to V
CC5
thru 30k
V
LFB
= 1.5V, C
OUT
= 330μF
I
LDRV
flows from V
CC12
I
LDRV
I
LDRV
-2.3
30
+1.5
%
mA
mA
0.2
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