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Part: Si786
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Company: Vishay Intertechnology
Datasheet: Download Si786 datasheet File size : 338 kB
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Si786
Vishay Siliconix
Dual-Output Power-Supply Controller
FEATURES
D D D D Fixed 5-V and 3.3-V Step-down Converters Less than 500-mA Quiescent Current per Converter 25-mA Shutdown Current 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. 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 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.
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 28-pin SSOP package 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
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
mP Memory Peripherals
Si786
Low-Battery Warning
Document Number: 70189 S-20593--Rev. I, 22-Apr-02
www.vishay.com
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Si786
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
V+ to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 36 V PGND to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . "2 V VL to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 7 V BST3, BST5 to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 36 V LX3 to BST3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 V to 0.3 V LX5 to BST5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -7 V to 0.3 V Inputs/Outputs to GND (D1, D2, SHDN, ON5, REF, SS5, CS5. FB5, SYNC, CS3, FB3, SS3, ON3)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V, (VL + 0.3 V) VH to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to 20 V Q1, Q2 to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V, (VH + 0.3 V) DL3, DL5 to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V, (VL + 0.3 V) DH3 to LX3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V (BST3 + 0.3 ) DH5 to LX5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V (BST5 + 0.3 ) REF, VL Short to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Momentary REF Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA VL Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA Continuous Power Dissipation (TA = 70_C)a 28-Pin SSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 762 mW Operating Temperature Range: (TMIN to TMAX) Si786CG/CRG/CSG (C-Grade) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 to 70_C Si786LG/LRG/LSG (L-Grade) . . . . . . . . . . . . . . . . . . . . . . . . . . . 10_ to 90_C Si786DG/DRG/DSG (D-Grade) . . . . . . . . . . . . . . . . . . . . . . . . . 40_ to 85_C Lead Temperature (soldering, 10 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . 300_C Notes 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, IVL = IREF = 0 mA, SHDN = ON3 = ON5 = 5 V Other Digital Input Levels 0 V or 5 V, TA = TMIN to TMAX
Limitse Mina Typb Maxa Unit
3.3-V and 5-V Step-Down Controllers
Input Supply Range FB5 Output Voltage 0 mV < (CS5-FB5) < 70 mV, 6 V < V + < 30 V (includes load and line regulation) 0 mV < (CS3-FB3) < 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 Current-Limit Voltage CS3-FB3 or CS5-FB5 Si786DG/DRG/DSG 77 2.5 SS3/SS5 Source Current SS3/SS5 Fault Sink Current Si786DG/DRG/DSG 2.3 2 100 100 4.0 4.0 120 120 6.5 6.5 mV mA mA 30 5.20 3.46 3.60 3.75 % %/V V
FB3 Output Voltage Load Regulation Line Regulation
Either Controller (CS_ to FB_ = 0 to 70 mV) Either Controller (V+ = 6 V to 30 V)
Internal Regulator and Reference
VL Output Voltage VL Fault Lockout Voltage VL/FB5 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 ON5 = ON3 = 0 V, 5.5 V < V+ < 30 V 0 mA < IL < 25 mA Falling Edge, Hysteresis = 1% Rising Edge of FB5, Hysteresis = 1% No External Loadc Falling Edge 0 mA < IL < 5 mAd SHDN = D1 = D2 = ON3 = ON5 = 0 V V+ = 30 V D1 = D2 = ON3 = ON5 = 0 V, V+ = 30 V D1 = D2 = 0 V, FB5 = CS5 = 5.25 V FB3 = CS3 = 3.5 V 4.5 3.6 4.2 3.24 2.4 30 25 70 Si786DG/DRG/DSG 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 mV V
FB5 = CS5 = 5.25 V, VL Switched Over to FB5
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Document Number: 70189 S-20593--Rev. I, 22-Apr-02
Si786
Vishay Siliconix
SPECIFICATIONS
Specific Test Conditions Parameter Comparators
1.61 D1, D2 Trip Voltage D1, D2 Input Current Q1, Q2 Source Current Q1, Q2 Sink Current Q1, Q2 Output High Voltage Q1, Q2 Output Low Voltage Quiescent VH Current Falling Edge, Hysteresis = 1% Si786DG/DRG/DSG 1.60 1.69 1.69 "100 12 VH = 15 V, VOUT = 2.5 V ISOURCE = 5 mA, VH = 3 V ISINK = 20 mA, VH = 3 V VH = 18 V, D1 = D2 = 5 V, No External Load 4 200 VH - 0.5 0.4 10 20 500 30 1000 V nA mA V mA V+ = 15 V, IVL = IREF = 0 mA, SHDN = ON3 = ON5 = 5 V Other Digital Input Levels 0 V or 5 V, TA = TMIN to TMAX
Limitse Mina Typb Maxa Unit
D1 = D2 = 0 V, 5 V
Oscillator and Inputs/Outputs
270 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 SYNC = 3.3 V Maximum Duty Cycle Input Low Voltage Input High Voltage Input Current DL3/DL5 Sink/Source Current DH3/DH5 Sink/Source Current DL3/DL5 On-Resistance DH3/DH5 On-Resistance SYNC = 0 V, 5 V SHDN, ON3, ON5 SYNC SHDN, ON3, ON5 SYNC SHDN, ON3, ON5 VIN = 0 V, 5 V VOUT = 2 V BST3 - LX3 = BST5 - LX5 = 4.5 V, VOUT = 2 V High or Low High or Low BST3 - LX3 = BST5 - LX5 = 4.5 V 1 1 7 7 W A 2.4 VL - 0.5 "1 mA Not Tested 240 89 92 92 95 0.8 V % 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 (AVCL) and the reference voltage load-regulation error. AVCL for the 3.3-V supply is unity gain. AVCL for the 5-V supply is 1.54. d. Since the reference uses VL as its supply, its V+ line regulation error is insignificant. e. Limits are for all temperature grades unless otherwise noted.
Document Number: 70189 S-20593--Rev. I, 22-Apr-02
www.vishay.com
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