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PDF Si786DG-T1 Data sheet ( Hoja de datos )
| Número de pieza | Si786DG-T1 | |
| Descripción | Dual-Output Power-Supply Controller | |
| Fabricantes | Vishay Siliconix | |
| Logotipo |  |
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Si786
Vishay Siliconix
Dual-Output Power-Supply Controller
FEATURES
D Fixed 5-V and 3.3-V Step-down Converters
D Less than 500-mA Quiescent Current per Converter
D 25-mA Shutdown Current
D 5.5-V to 30-V Operating Range
DESCRIPTION
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
linear 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
monitoring 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 regulator,
the Si9140 SMP Controller for High Performance Processor
Power Supplies, five Si4410 n-channel TrenchFETR 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) temperature
ranges. See Ordering Information for corresponding part
numbers.
FUNCTIONAL BLOCK DIAGRAM
5.5. V
to
30 V
SHUTDOWN
5-V ON/OFF
3.3-V ON/OFF
SYNC
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
Si786
Power
Section
3.3 V
5V
mP
Memory
Peripherals
Low-Battery Warning
Power-Good
www.vishay.com
1
1 page  
Si786
Vishay Siliconix
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
Shutdown Supply Current vs. Supply Voltage
100
SHDN = 0 V
75
50
25
1.0
0.8
0.6
0.4
0.2
Minimum VIN to VOUT Differential
vs. 5-V Output Current
5-V Output
Still Regulating
300 kHz
200 kHz
0
0 6 12 18 24 30
Supply Voltage (V)
0.0
0.001
0.01
0.1
1
5-V Output Current (A)
1000.0
100.0
Switching Frequency vs. Load Current
SYNC = REF (300 kHz)
ON3 = ON5 = 5 V
10
Pulse-Skipping Waveforms
10.0
5 V, V+ = 30 V
5 V, V+ = 7.5 V
1.0
3.3 V, V+ = 7.5 V
0.1
0.1
1 10 100
Load Current (mA)
1000
Pulse-Width Modulation Mode Waveforms
5-V Output
50 mV/div
LX 10 V/div
200 mS/div
ILoad = 100 mA
VIN = 10 V
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
2 V/div
500 ns/div
5-V Output Current = 1 A
VIN = 16 V
5-V Output
50 mV/div
www.vishay.com
5
5 Page 
Si786
Vishay Siliconix
60 kHz
LPF
1X
CS
_
FB_
REF, 3.3 V
(or Internal 5-V
Reference)
Summing
Comparator
RQ
S
OSC
Level
Shift
BST_
DH
_
LX_
Slope
Comp
25 mV
SS_
ON_
4 mA
Minimum Current
(Pulse-Skipping)
VL
30R
3.3 V
1R
Current
Limit
0 mV to
100 mV
Synchronous
Rectifier Control
RQ
S
FIGURE 3. Si786 Controller Block Diagram
Shoot-
Through
Control
Level
Shift
VL
DL_
PGND
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
www.vishay.com
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet Si786DG-T1.PDF ] | |
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