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LTC1709-7 数据表(PDF) 2 Page - Linear Technology

部件名 LTC1709-7
功能描述  Wide Operating Range, No RSENSE Step-Down Controller
PDF  24 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1709-7 数据表(HTML) 2 Page - Linear Technology

  LTC1709-7 Datasheet HTML 1Page - Linear Technology LTC1709-7 Datasheet HTML 2Page - Linear Technology LTC1709-7 Datasheet HTML 3Page - Linear Technology LTC1709-7 Datasheet HTML 4Page - Linear Technology LTC1709-7 Datasheet HTML 5Page - Linear Technology LTC1709-7 Datasheet HTML 6Page - Linear Technology LTC1709-7 Datasheet HTML 7Page - Linear Technology LTC1709-7 Datasheet HTML 8Page - Linear Technology LTC1709-7 Datasheet HTML 9Page - Linear Technology Next Button
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LTC1778/LTC1778-1
1778fb
Input Supply Voltage (VIN, ION)................. 36V to –0.3V
Boosted Topside Driver Supply Voltage
(BOOST) ................................................... 42V to – 0.3V
SW Voltage .................................................. 36V to – 5V
EXTVCC, (BOOST – SW), RUN/SS,
PGOOD Voltages ....................................... 7V to – 0.3V
FCB, VON, VRNG Voltages .......... INTVCC + 0.3V to –0.3V
ITH, VFB Voltages...................................... 2.7V to –0.3V
ORDER PART
NUMBER
LTC1778EGN
LTC1778IGN
TJMAX = 125°C, θJA = 130°C/ W
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
GN PART MARKING
1778
1778I
TG, BG, INTVCC, EXTVCC Peak Currents.................... 2A
TG, BG, INTVCC, EXTVCC RMS Currents .............. 50mA
Operating Ambient Temperature Range (Note 4)
LTC1778E ........................................... – 40°C to 85°C
LTC1778I .......................................... – 40°C to 125°C
Junction Temperature (Note 2) ............................ 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RUN/SS
PGOOD
VRNG
FCB
ITH
SGND
ION
VFB
BOOST
TG
SW
PGND
BG
INTVCC
VIN
EXTVCC
ORDER PART
NUMBER
LTC1778EGN-1
GN PART MARKING
17781
TOP VIEW
GN PACKAGE
16-LEAD PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RUN/SS
VON
VRNG
FCB
ITH
SGND
ION
VFB
BOOST
TG
SW
PGND
BG
INTVCC
VIN
EXTVCC
The
● denotes specifications which apply over the full operating
temperature range, otherwise specifications are TA = 25°C. VIN = 15V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
IQ
Input DC Supply Current
Normal
900
2000
µA
Shutdown Supply Current
15
30
µA
VFB
Feedback Reference Voltage
ITH = 1.2V (Note 3) LTC1778E
●
0.792
0.800
0.808
V
ITH = 1.2V (Note 3) LTC1778I
●
0.792
0.800
0.812
V
∆VFB(LINEREG)
Feedback Voltage Line Regulation
VIN = 4V to 30V, ITH = 1.2V (Note 3)
0.002
%/V
∆VFB(LOADREG) Feedback Voltage Load Regulation
ITH = 0.5V to 1.9V (Note 3)
●
– 0.05
– 0.3
%
IFB
Feedback Input Current
VFB = 0.8V
–5
±50
nA
gm(EA)
Error Amplifier Transconductance
ITH = 1.2V (Note 3)
●
1.4
1.7
2
mS
VFCB
Forced Continuous Threshold
●
0.76
0.8
0.84
V
IFCB
Forced Continuous Pin Current
VFCB = 0.8V
– 1
– 2
µA
tON
On-Time
ION = 30µA, VON = 0V (LTC1778-1)
198
233
268
ns
ION = 15µA, VON = 0V (LTC1778-1)
396
466
536
ns
tON(MIN)
Minimum On-Time
ION = 180µA
50
100
ns
TJMAX = 125°C, θJA = 130°C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
(Note 1)



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