The Si786 Dual Controller for Portable Computer Power
Conversion is pin and functionally compatible with the
MAX786 dual-output power supply controller for notebook
computers. The device is designed as a drop-in replacement
for that circuit.
The circuit is a system level integration of two step-down
controllers, micropower 5 V and 3.3 V linear regulators, and
two comparators. The controllers perform high efficiency
conversion of the battery pack energy (typically 12 V) or the
output of an ac to dc wall converter (typically 18 V to 24 V dc)
to 5 V and 3.3 V system supply voltages. The micropower lin-
ear regulator can be used to keep power management and
back-up circuitry alive during the shutdown of the step-down
converters. The comparators can be biased at any voltage
between 2.7 V and the input voltage, simplifying battery mon-
itoring or providing sufficient voltage to enhance the gate of
a low on-resistance N-Channel FET used in switching power
to different zones in the system.
A complete power conversion and management system can
be implemented with the Si786 Dual Controller for Portable
Computer Power Conversion, an inexpensive linear regula-
tor, the Si9140 SMP Controller for High Performance Proces-
sor Power Supplies, five Si4410 N-Channel TrenchFET
®
Power MOSFETs, one Si4435 P-Channel TrenchFET Power
MOSFET, and two Si9712 PC Card (PCMCIA) Interface
Switches.
The Si9130 Pin-Programmable Dual Controller for Portable
PCs is another integrated system level devices for portable
PC power systems.
The Si786 is available in both standard and lead (Pb)-free
28-pin SSOP packages and specified to operate over the
(0 °C to 70 °C), (- 10 °C to 90 °C) and (- 40 °C to 85 °C) tem-
perature ranges. See Ordering Information for corresponding
part numbers.
FUNCTIONAL BLOCK DIAGRAM
3.3 V
5.5. V
to
30 V
SHUTDOWN
5 V ON/OFF
3.3 V ON/OFF
SYNC
Power-Good
Power
Section
5V
µP
Memory
Peripherals
Si786
Low-Battery Warning
Document Number: 70189
S-40807-Rev. J, 26-Apr-04
www.vishay.com
1
Si786
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Parameter
V+ to GND
PGND to GND
V
L
to GND
BST
3
, BST
5
to GND
LX
3
to BST
3
LX
5
to BST
5
Product is End of Life 3/2014
Limit
- 0.3 V to 36 V
±2
- 0.3 V to 7 V
- 0.3 V to 36 V
- 7 V to 0.3 V
- 7 V to 0.3 V
- 0.3 V, (V
L
+ 0.3 V)
- 0.3 V to 20 V
- 0.3 V, (V
H
+ 0.3 V)
- 0.3 V, (V
L
+ 0.3 V)
- 0.3 V (BST
3
+ 0.3 )
- 0.3 V (BST
5
+ 0.3 )
Momentary
20
50
28-Pin SSOP
b
Si786CG/CRG/CSG (C-Grade)
Si786LG/LRG/LSG (L-Grade)
Si786DG/DRG/DSG (D-Grade)
762
0 to 70
- 10 to 90
- 40 to 85
300
Unit
Inputs/Outputs to GND (D
1
, D
2
, SHDN, ON
5
, REF, SS
5
, CS
5
, FB
5
, SYNC, CS
3
, FB
3
,
SS
3
, ON
3
)
V
H
to GND
Q
1
, Q
2
to GND
DL
3
, DL
5
to PGND
DH
3
to LX
3
DH
5
to LX
5
REF, V
L
Short to GND
REF Current
V
L
Current
Continuous Power Dissipation (T
A
= 70 °C)
a
Operating Temperature Range:
(T
MIN
to T
MAX
)
Lead Temperature (soldering, 10 sec)
Notes:
a. Device Mounted with all leads soldered or welded to PC board.
b. Derate 9.52 mW/°C above 70 °C.
V
mA
mW
°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
Parameter
3.3 V and 5 V Step-Down Controllers
Input Supply Range
FB
5
Output Voltage
FB
3
Output Voltage
Load Regulation
Line Regulation
Current-Limit Voltage
SS
3
/SS
5
Source Current
SS
3
/SS
5
Fault Sink Current
Internal Regulator and Reference
V
L
Output Voltage
V
L
Fault Lockout Voltage
www.vishay.com
2
ON
5
= ON
3
= 0 V, 5.5 V < V+ < 30 V
0 mA < I
L
< 25 mA
Falling Edge, Hysteresis = 1 %
4.5
3.6
5.5
4.2
V
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
µA
mA
V
Specific Test Conditions
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
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
Document Number: 70189
S-40807-Rev. J, 26-Apr-04
Product is End of Life 3/2014
Si786
Vishay Siliconix
SPECIFICATIONS
Parameter
Internal Regulator and Reference
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
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
Oscillator and Inputs/Outputs
SYNC = 3.3 V
Oscillator Frequency
SYNC = 0 V, 5 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
Ω
2.4
V
L
- 0.5
±1
µA
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
Falling Edge Hysteresis = 1 %
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
µA
V
µA
Rising Edge of FB
5
, Hysteresis = 1 %
No External Load
c
Falling Edge
0 mA < I
L
< 5 mA
d
Specific Test Conditions
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
4.2
3.24
2.4
30
25
70
4.7
3.36
3.2
75
40
110
115
8.6
9.0
60
mV
µA
µA
mV
V
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 V
FB
3
= CS
3
= 3.5 V
Si786DG/DRG/DSG
Si786DG/DRG/DSG
70
5.5
5.5
30
FB
5
= CS
5
= 5.25 V, V
L
Switched Over to FB
5
D
1
= D
2
= 0 V, 5 V
V
H
= 15 V, V
OUT
= 2.5 V
I
SOURCE
= 5 A, V
H
= 3 V
I
SINK
= 20 A, V
H
= 3 V
V
H
= 18 V, D
1
= D
2
= 5 V, No External Load
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.
Definition of interactive projection system:
Interactive projection systems, also known as multimedia interactive projection, are available in floor, wall, and tabletop interactive projection....[详细]
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