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LTC1649 数据表(PDF) 2 Page - Linear Technology

部件名 LTC1649
功能描述  3.3V Input High Power Step-Down Switching Regulator Controller
Download  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1649 数据表(HTML) 2 Page - Linear Technology

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LTC1649
LTC1649CS
LTC1649IS
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
MIN
TYP
MAX
UNITS
VIN
Minimum Supply Voltage
Figure 1 (Note 3)
q
2.7
2.7
V
VFB
Feedback Voltage
Figure 1
q
1.25
1.265
1.28
1.23
1.265
1.29
V
VCPOUT
Charge Pump Output Voltage
Figure 1
q
4.8
5
5.2
4.75
5
5.25
V
IIN
Supply Current (VIN)VSHDN = VCC, ILOAD = 0
q
35
3
5
mA
VSHDN = 0V
10
25
10
25
µA
IPVCC1, 2 Supply Current (PVCC1, 2)PVCC = 5V, VSHDN = VCC (Note 4)
1.5
1.5
mA
VSHDN = 0V
0.1
0.1
µA
fCP
Internal Charge Pump Frequency
ICPOUT = 20mA (Note 5)
700
700
kHz
fOSC
Internal PWM Oscillator Frequency
q
140
200
260
130
200
325
kHz
VIH
SHDN Input High Voltage
q
2.4
2.4
V
VIL
SHDN Input Low Voltage
q
0.8
0.8
V
IIN
SHDN Input Current
q
±0.01
±1
±0.01
±1
µA
gmV
Error Amplifier Transconductance
650
650
µMho
gmI
ILIM Amplifier Transconductance
(Note 6)
1300
1300
µMho
IIMAX
IMAX Sink Current
VIMAX = VCC
q
8
12
16
8
12
17
µA
ISS
Soft Start Source Current
VSS = 0V
q
–8
–12
–16
–8
–12
–17
µA
tr, tf
Driver Rise/Fall Time
PVCC1 = PVCC2 = 5V (Note 7)
80
250
80
250
ns
tNOV
Driver Non-Overlap Time
PVCC1 = PVCC2 = 5V
25
130
250
25
130
250
ns
DCMAX
Maximum Duty Cycle
VCOMP = VCC
90.5
93
90.5
93
%
Supply Voltage
VIN ........................................................................................... 6V
VCC........................................................................................... 9V
PVCC1, 2 ................................................................................ 13V
Input Voltage
IFB ....................................................................... – 0.3V to 18V
C+, C – ................................................ – 0.3V to (VIN + 0.3V)
All Other Inputs ....................... – 0.3V to (VCC + 0.3V)
Operating Temperature Range
LTC1649C ............................................... 0
°C to 70°C
LTC1649I ............................................ – 40
°C to 85°C
Storage Temperature Range ................. – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
ABSOLUTE MAXIMUM RATINGS
TJMAX = 150°C, θJA = 110°C/ W
ORDER PART
NUMBER
LTC1649CS
LTC1649IS
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
G1
PVCC1
GND
FB
SHDN
SS
VIN
C
G2
PVCC2
VCC
IFB
IMAX
COMP
CPOUT
C+
PACKAGE/ORDER INFORMATION
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.3V (Note 2)
(Note 1)
Consult factory for parts specified with wider operating temperature ranges.


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