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LTC1873 Datasheet (HTML) - Linear Technology

Part No. LTC1873
Description  Dual 550kHz Synchronous 2-Phase Switching Regulator Controller with 5-Bit VID
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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 2 page
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2
LTC1873
(Note 1)
Supply Voltage
VCC........................................................................................... 7V
BOOST
n ............................................................... 15V
BOOST
n – SWn .................................................... 7V
Input Voltage
SW
n .......................................................... – 1V to 8V
VID
n ....................................................... – 0.3V to 7V
All Other Inputs ......................... – 0.3V to VCC + 0.3V
Peak Output Current < 10
µs
TG
n, BGn ............................................................... 5A
Operating Temperature Range
(Note 2) ............................................. – 40
°C to 85°C
Storage Temperature Range ................. – 65
°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300
°C
ORDER PART
NUMBER
TJMAX = 125°C, θJA = 55°C/ W
LTC1873EG
Consult factory for Industrial and Military grade parts.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Main Control Loop
VCC
VCC Supply Voltage
q
37
V
PVCC
PVCC Supply Voltage
(Note 3)
q
37
V
BVCC
BOOST Pin Voltage
VBOOST – VSW (Note 3)
q
2.7
7
V
ICC
VCC Supply Current
Test Circuit 1
q
2.2
8
mA
RUN/SS1 = RUN/SS2 = 0V (Note 6)
q
30
100
µA
IPVCC
PVCC Supply Current
Test Circuit 1 (Note 5)
q
2.2
6
mA
RUN/SS1 = RUN/SS2 = 0V (Note 6)
q
6
100
µA
IBOOST
BOOST Pin Current
Test Circuit 1 (Note 5)
q
1.3
3
mA
RUN/SS1 = RUN/SS2 = 0V
q
0.1
10
µA
VFB
Feedback Voltage
Test Circuit 1
q
0.790
0.800
0.810
V
∆VFB
Feedback Voltage Line Regulation
VCC = 3V to 7V
q
±0.005
±0.05
%/V
IFB
Feedback Current
FB2 Only (Note 7)
q
±0.001
±1
µA
VFCB
FCB Threshold
q
0.75
0.8
0.85
V
∆VFCB
FCB Feedback Hysteresis
20
mV
IFCB
FCB Pin Current
q
±0.001
±1
µA
VRUN
RUN/SS Pin RUN Threshold
q
0.45
0.55
0.65
V
ISS
Soft Start Source Current
RUN/SS
n = 0V
– 1.5
– 3.5
– 5.5
µA
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C.
VCC = 5V unless otherwise specified. (Note 4)
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TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PVCC
BOOST1
BG1
TG1
SW1
IMAX1
FCB
RUN/SS1
COMP1
SGND
FB1
SENSE
VID0
VID1
IMAX2
BOOST2
BG2
TG2
SW2
PGND
FAULT
RUN/SS2
COMP2
FB2
VCC
VID4
VID3
VID2
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
ELECTRICAL CHARACTERISTICS



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