參數(shù)資料
型號(hào)： LX1668CPW-TR
廠商： MICROSEMI CORP-ANALOG MIXED SIGNAL GROUP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING CONTROLLER, 250 kHz SWITCHING FREQ-MAX, PDSO20
封裝： ROHS COMPLIANT, PLASTIC, TSSOP-20
文件頁數(shù)： 9/15頁
文件大?。?/td> 392K
代理商： LX1668CPW-TR
PROGRAMMABLE MULTIPLE OUTPUT DC:DC CONTROLLER
LX1668
PRODUCT DA T ABOOK 1996/1997
3
Copyright 1999
Rev. 1.0a
P RODUCTION D AT A S HEET
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, 4.75V < V
CC5 < 5.25V and 10.8V < VCC12 < 13.2V, 0°C ≤ TA ≤ 70°C.
Test conditions: V
CC3 = VCC5, VCC5 = 5V, VCC12 = 12V,
T = 25°C.)
Reference & DAC
Parameter
Symbol
Test Conditions
Initial Accuracy
V
CORE
(Less 40mV output adaptive positioning),
1.3V
≤ V
CORE ≤ 35V, T = 25°C
Cumulative Regulation Accuracy
1.3V
≤ V
CORE ≤ 3.5V
Timing
Off Time
OT
V
CORE = 2.0V
Swicthing Frequency
Freq
V
CORE = 1.3V to 3.5V
Input Resistance
R
CORE
0V < V
FB = VCORE < 3.5V
Pulse By Pulse Current Limit
V
CLP
Current Sense Delay To Output
Overdrive
≤ 5mV
Error Comparator / CS-
Input Bias Current
I
FB
1.0V < V
SS = VFB < 3.5V
E
C Delay to Output
Overdrive
≤ 5mV
Output Drivers
Drive Rise Time, Fall Time
T
RF
C
L = 3000pF
Drive High
V
DH
I
SOURCE = 20mA
Drive Low
V
DL
I
SINK = 20mA
UVLO and Soft-Start (SS)
V
CC5 Start-Up Threshold
V
ST
V
CC12 > 3.9V
Hysteresis
SS Resistor
R
SS
SS Output Enable
V
EN
Hiccup Duty Cycle
DC
HIC
C
SS = 0.1F, V DAC = 2.00V, FREQ = 100Hz
Supply Current
V
CC12 Dynamic Supply Current
I
CD
Out Freq = 200kHz, C
L = 3000pF, Synch., VSS > 0.5V
Static Supply Current
12V
I
VCC12
V
SS < 0.5V
5V
I
VCC5
V
SS < 0.5V
3.3V
I
VCC3
V
SS < 0.5V
Power Good / Over-Voltage Protection (OVP)
Threshold
(V
CORE / VSET)
V
CORE rising, VOUT2 ≥ 2.0V
(V
CORE / VSET)
V
CORE falling, VOUT2 ≥ 2.0V
Hysteresis
Power Good Voltage Low
I
PWRGD = 4mA
Over-Voltage Threshold
(V
CORE / VSET), V CORE rising
OVP Sourcing Current
V
OVP = 2.0V
Units
-1
+1
%
-1.5
1.5
%
LX1668
Min.
Typ.
Max.
2.4
s
250
kHz
-0.3
-1
A
100
ns
12
k
45
60
mV
100
ns
100
ns
10
11
V
0.1
V
3.9
4.2
4.6
V
0.10
V
18
k
0.4
0.5
V
10
%
24
mA
69
mA
13
18
mA
0.4
2
mA
108
110
111
%
90
91
92
%
2%
0.5
0.7
V
110
117
125
%
35
60
mA
Fixed Linear Regulator (V
OUT2)
Voltage Reference Tolerance
V
OUT2 = 2.5V, C OUT = 220F
Regulation
-10mA
≤ I
OUT2 ≤ -150mA
Current Limit
V
OUT2 ≤ 2V
-2.3
+2.0
%
-1
+1
%
250
mA
Current Sense +
VID Pins
0.8
V
2.0
V
Low Input
V
IL
Internally pulled up to V
CC5 thru 30k
High Input
V
IH
Linear Regulator Controller
Voltage Reference Tolerance
V
LFB = 1.5V, COUT = 330F
Source Current
I
LDRV
I
LDRV flows from VCC12
Sink Current
I
LDRV
-2.3
+1.5
%
30
mA
0.2
mA
O
B
SO
LETE
PRO
D
UCT
NOT
RECOMMENDED
FOR
NEW
DESIGNS
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