SI786LG Vishay, SI786LG Datasheet

IC, DUAL POWER SUPPLY CONTROLLER, SSOP28

SI786LG

Manufacturer Part Number
SI786LG
Description
IC, DUAL POWER SUPPLY CONTROLLER, SSOP28
Manufacturer
Vishay
Datasheet

Specifications of SI786LG

Primary Input Voltage
15V
No. Of Outputs
2
Output Voltage
3.3V
Output Current
25mA
No. Of Pins
28
Operating Temperature Range
-10°C To +90°C
Power Dissipation Pd
762mW
Number Of Outputs
2
Input Voltage
5.5 V to 30 V
Mounting Style
SMD/SMT
Package / Case
SSOP-28
Maximum Operating Temperature
+ 90 C
Minimum Operating Temperature
- 10 C
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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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.
Document Number: 70189
S-40807—Rev. J, 26-Apr-04
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
FUNCTIONAL BLOCK DIAGRAM
3.3-V ON/OFF
SHUTDOWN
5-V ON/OFF
Dual-Output Power-Supply Controller
SYNC
5.5. V
30 V
to
Si786
Low-Battery Warning
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.
Power-Good
Section
Power
3.3 V
5 V
Peripherals
Memory
mP
Vishay Siliconix
www.vishay.com
Si786
1

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SI786LG Summary of contents

Page 1

... 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. 3.3 V Power Section 5 V Si786 Low-Battery Warning Power-Good Si786 Vishay Siliconix mP Memory Peripherals www.vishay.com 1 ...

Page 2

... L "2 V REF Current -0. Current L -0. Continuous Power Dissipation ( 0.3 V 28-Pin SSOP - 0.3 V Operating Temperature Range: (T Si786CG/CRG/CSG (C-Grade Si786LG/LRG/LSG (L-Grade) -0 0.3 V) Si786DG/DRG/DSG (D-Grade Lead Temperature (soldering, 10 sec Notes -0.3 V (BST + 0 Device mounted with all leads soldered or welded to PC board. ...

Page 3

... OUT BST - LX = BST - OUT High or Low High or Low BST - LX = BST - for the 3.3-V supply is unity gain. AV for the 5-V supply is 1.54 Vishay Siliconix e Limits = Min Typ Max MAX MAX 1.61 1.69 1.60 1.69 "100 12 20 200 500 1000 V - 0.5 H ...

Page 4

... Si786 Vishay Siliconix TYPICAL CHARACTERISTICS (25_C UNLESS NOTED) Efficiency vs. 5-V Output Current, 200 kHz 100 SYNC = 0 V, 3.3 V Off 60 50 0.001 0.01 0.1 5-V Output Current (A) Efficiency vs. 3.3-V Output Current, 200 kHz 100 SYNC = 0.001 0.01 0.1 3.3-V Output Current (A) Quiescent Supply Current vs. Supply Voltage ...

Page 5

... 100.0 10 7.5 V 1.0 3 7.5 V 0.1 0 Load Current (mA) Pulse-Width Modulation Mode Waveforms 5-V Output 50 mV/div 2 V/div Vishay Siliconix Minimum Differential IN OUT vs. 5-V Output Current 5-V Output Still Regulating 300 kHz 200 kHz 0.001 0.01 0.1 1 5-V Output Current (A) 100 1000 500 ns/div ...

Page 6

... Si786 Vishay Siliconix TYPICAL CHARACTERISTICS (25_C UNLESS NOTED) 5-V Load-Transient Response 200 mS/div 5-V Line-Transient Response, Rising 20 mS/div LOAD 3.3-V Line-Transient Response, Rising 20 mS/div LOAD www.vishay.com 6 3.3-V Load-Transient Response 3 A LOAD CURRENT 0 A 5-V Output 50 mV/div 5-V Line-Transient Response, Falling 5-V Output ...

Page 7

... Top View Description to GND when D is high. Sinks 500 mA to GND when for automatic turn-on. The 5 for automatic turn-on. L Si786 Vishay Siliconix . 3 for automatic turn-on low regardless of V input 2 H supply will not be disabled in shutdown allow GND remains on with valid voltage at V+. L www ...

Page 8

... ORDERING INFORMATION Lead (Pb)-Free Part Number Temp Range Si786CG-T1—E3 C-Grade C-Grade 0 to 70_C Si786CRG-T1—E3 Si786CSG-T1—E3 Si786LG-T1—E3 L-Grade L-Grade −10_ to 90_C Si786LRG-T1—E3 Si786LSG-T1—E3 Si786DG-T1—E3 D-Grade D-Grade −40_ to 85_C Si786DRG-T1—E3 Si786DSG-T1—E3 Demo Board ...

Page 9

... Oscillations on the gates of the high-side MOSFET in discontinuous mode are a natural occurrence caused by the LC network formed by the inductor and stray capacitance at the LX_ pins. The negative side of the BST_ capacitor is connected to the LX_ node, so ringing at the inductor is translated through to the gate drive. Si786 Vishay Siliconix www.vishay.com 9 ...

Page 10

... Si786 Vishay Siliconix SCHEMATIC DRAWINGS INPUT 5 3 D1FS4 150 mF C12 (Note 1) 150 mF 0.01 mF 3.3 V ON/OFF 5 V ON/OFF SHUTDOWN OSC SYNC Note 1: Use short, Kelvin-connected PC board traces placed very close to one another REF SHDN SYNC 1.65 V www.vishay.com 10 100 W D2A 0.1 mF D2B ...

Page 11

... Document Number: 70189 S-40807—Rev. J, 26-Apr- kHz LPF Summing Comparator Minimum Current (Pulse-Skipping Current Limit 100 mV 30R 3 FIGURE 3. Si786 Controller Block Diagram Si786 Vishay Siliconix CS _ FB_ BST_ R Q Level DH S Shift _ LX_ OSC Shoot- Through Control V L Level DL_ Shift PGND www ...

Page 12

... Si786 Vishay Siliconix PWM OPERATIONAL MODES PWM Mode The 3.3-V and 5-V Buck controllers continuous-current PWM mode when the load demands more than approximately 25% of the maximum current (see typical curves). The duty cycle can be approximated as Duty_Cycle = OUT IN In this mode, the inductor current is continuous; in the first half ...

Page 13

... V = Reference voltage, 3.3 V; REF V = Output voltage, 3 OUT R = Sense resistor (W); CS GBWP = Gain-bandwidth product, 60 kHz; ESR = Output filter capacitor ESR (W). CF Si786 Vishay Siliconix ), and coil LPEAK OUT ( LIR ) = Maximum input voltage (V equal to the steady-state LPEAK equal LPEAK V –V IN(MAX) OUT IN(MAX) www ...

Page 14

... Si786 Vishay Siliconix Both minimum capacitance and maximum ESR requirements must be met. In order to get the low ESR, a capacitance value of two to three times greater than the required minimum may be necessary. The equation for output ripple in continuous current mode is ESR ) OUT(RPL) LPP(MAX The equations for capacitive and resistive components of the ...

Page 15

... Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any information provided herein to the maximum extent permitted by law. The product specifications do not expand or otherwise modify Vishay’ ...

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