a. Device mounted with all leads soldered or welded to PC board.
b. Derate 9.52 mW/_C above 70_C.
Exposure to Absolute Maximum rating conditions for extended periods may affect device reliability. Stresses above Absolute Maximum rating may cause permanent
damage. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum rating should be applied at any one
time
SPECIFICATIONS
Specific Test Conditions
Parameter
V+ = 15 V, I
VL
= I
REF
= 0 mA, SHDN = ON
3
= ON
5
= 5 V
Other Digital Input Levels 0 V or 5 V, T
A
= T
MIN
to T
MAX
Limits
e
Min
a
Typ
b
Max
a
Unit
3.3-V and 5-V Step-Down Controllers
Input Supply Range
FB
5
Output Voltage
0 mV < (CS
5
-FB
5
) < 70 mV, 6 V < V + < 30 V
(includes load and line regulation)
0 mV < (CS
3
-FB
3
) < 70 mV
6 V < V + < 30 V
(includes load and line regulation)
Si786CG/LG/DG
Si786CRG/LRG/DRG
Si786CSG/LSG/DSG
5.5
4.80
3.17
3.32
3.46
5.08
3.35
3.50
3.65
2.5
0.03
80
Si786DG/DRG/DSG
Si786DG/DRG/DSG
77
2.5
2.3
2
100
100
4.0
4.0
120
120
6.5
6.5
30
5.20
3.46
3.60
3.75
%
%/V
mV
mA
mA
V
FB
3
Output Voltage
p
g
Load Regulation
Line Regulation
Current-Limit
Current Limit Voltage
SS
3
/SS
5
Source Current
SS
3
/SS
5
Fault Sink Current
Either Controller (CS_ to FB_ = 0 to 70 mV)
Either Controller (V+ = 6 V to 30 V)
CS
3
-FB
3
or CS
5
-FB
5
FB
FB
Internal Regulator and Reference
V
L
Output Voltage
V
L
Fault Lockout Voltage
V
L
/FB
5
Switchover Voltage
REF Output Voltage
REF Fault Lockout Voltage
REF Load Regulation
V+ Shutdown Current
V+ Standby Current
Quiescent Power Consumption
(both PWM controllers on)
V+ Off Current
www.vishay.com
ON
5
= ON
3
= 0 V, 5.5 V < V+ < 30 V
0 mA < I
L
< 25 mA
Falling Edge, Hysteresis = 1%
Rising Edge of FB
5
, Hysteresis = 1%
No External Load
c
Falling Edge
0 mA < I
L
< 5 mA
d
SHDN = D
1
= D
2
= ON
3
= ON
5
= 0 V
V+ = 30 V
D
1
= D
2
= ON
3
= ON
5
= 0 V, V+ =
30 V
D
1
= D
2
= 0 V, FB
5
= CS
5
=
5.25
5 25 V
FB
3
= CS
3
= 3.5 V
Si786DG/DRG/DSG
4.5
3.6
4.2
3.24
2.4
30
25
70
70
5.5
Si786DG/DRG/DSG
5.5
30
5.5
4.2
4.7
3.36
3.2
75
40
110
115
8.6
9.0
60
mW
mA
mA
A
mV
V
FB
5
= CS
5
= 5.25 V, V
L
Switched Over to FB
5
2
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
Si786
Vishay Siliconix
SPECIFICATIONS
Specific Test Conditions
Parameter
Comparators
D
1
, D
2
Trip Voltage
D
1
, D
2
Input Current
Q
1
, Q
2
Source Current
Q
1
, Q
2
Sink Current
Q
1
, Q
2
Output High Voltage
Q
1
, Q
2
Output Low Voltage
Quiescent V
H
Current
Falling Edge Hysteresis = 1%
Edge,
1.61
Si786DG/DRG/DSG
1.60
12
200
V
H
- 0.5
0.4
4
10
20
500
1.69
1.69
"100
30
1000
V
nA
mA
V
mA
V+ = 15 V, I
VL
= I
REF
= 0 mA, SHDN = ON
3
= ON
5
= 5 V
Other Digital Input Levels 0 V or 5 V, T
A
= T
MIN
to T
MAX
Limits
e
Min
a
Typ
b
Max
a
Unit
D
1
= D
2
= 0 V, 5 V
V
H
= 15 V, V
OUT
= 2 5 V
V
2.5
I
SOURCE
= 5
mA,
V
H
= 3 V
I
SINK
= 20
mA,
V
H
= 3 V
V
H
= 18 V, D
1
= D
2
= 5 V, No External Load
Oscillator and Inputs/Outputs
SYNC = 3 3 V
3.3
Oscillator Frequency
SYNC = 0 V 5 V
V,
SYNC High Pulse Width
SYNC Low Pulse Width
SYNC Rise/Fall Time
Oscillator SYNC Range
Maximum Duty Cycle
Input Low Voltage
Input High Voltage
Input Current
DL
3
/DL
5
Sink/Source Current
DH
3
/DH
5
Sink/Source Current
DL
3
/DL
5
On-Resistance
DH
3
/DH
5
On-Resistance
SYNC = 3.3 V
SYNC = 0 V, 5 V
SHDN, ON
3
, ON
5
SYNC
SHDN, ON
3
, ON
5
SYNC
SHDN, ON
3
, ON
5
V
IN
= 0 V, 5 V
V
OUT
= 2 V
BST
3
- LX
3
= BST
5
- LX
5
= 4.5 V, V
OUT
= 2 V
High or Low
High or Low
BST
3
- LX
3
= BST
5
- LX
5
= 4.5 V
1
1
7
7
W
2.4
V
L
- 0.5
"1
mA
A
Not Tested
240
89
92
92
95
0.8
V
270
Si786DG/DRG/DSG
Si786DG/DRG/DSG
260
170
165
200
200
200
350
kHz
%
ns
300
300
200
200
330
330
230
230
kHz
Notes
a. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum.
b. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing.
c. The main switching outputs track the reference voltage. Loading the reference reduces the main outputs slightly according to the closed-loop gain (AV
CL
) and
the reference voltage load-regulation error. AV
CL
for the 3.3-V supply is unity gain. AV
CL
for the 5-V supply is 1.54.
d. Since the reference uses V
L
as its supply, its V+ line regulation error is insignificant.
e. Limits are for all temperature grades unless otherwise noted.
