SI786 datasheet(2/14 Pages) VISHAY

2 / 14 page

Si786

Vishay Siliconix

www.vishay.com

Document Number: 70189

S-40807—Rev. J, 26-Apr-04

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

Device mounted with all leads soldered or welded to PC board.

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

Limitse

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

Mina

Typb

Maxa

Unit

3.3-V and 5-V Step-Down Controllers

Input Supply Range

5.5

FB5 Output Voltage

0 mV < (CS5-FB5) < 70 mV, 6 V < V + < 30 V

(includes load and line regulation)

4.80

5.08

5.20

0 mV < (CS3-FB3) < 70 mV

Si786CG/LG/DG

3.17

3.35

3.46

FB3 Output Voltage

0 mV < (CS3-FB3) < 70 mV

6 V < V + < 30 V

(includes load and line regulation)

Si786CRG/LRG/DRG

3.32

3.50

3.60

(includes load and line regulation)

Si786CSG/LSG/DSG

3.46

3.65

3.75

Load Regulation

Either Controller (CS_ to FB_ = 0 to 70 mV)

2.5

Line Regulation

Either Controller (V+ = 6 V to 30 V)

0.03

%/V

Current Limit Voltage

CS3 FB3 or CS5 FB5

100

120

Current-Limit Voltage

CS3-FB3 or CS5-FB5

Si786DG/DRG/DSG

100

120

SS3/SS5 Source Current

2.5

4.0

6.5

SS3/SS5 Source Current

Si786DG/DRG/DSG

2.3

4.0

6.5

SS3/SS5 Fault Sink Current

Internal Regulator and Reference

VL Output Voltage

ON5 = ON3 = 0 V, 5.5 V < V+ < 30 V

0 mA < IL < 25 mA

4.5

5.5

VL Fault Lockout Voltage

Falling Edge, Hysteresis = 1%

3.6

4.2

VL/FB5 Switchover Voltage

Rising Edge of FB5, Hysteresis = 1%

4.2

4.7

REF Output Voltage

No External Loadc

3.24

3.36

REF Fault Lockout Voltage

Falling Edge

2.4

3.2

REF Load Regulation

0 mA < IL < 5 mAd

V+ Shutdown Current

SHDN = D1 = D2 = ON3 = ON5 = 0 V

V+ = 30 V

V+ Standby Current

D1 = D2 = ON3 = ON5 = 0 V, V+ =

110

V+ Standby Current

D1 = D2 = ON3 = ON5 = 0 V, V+ =

30 V

Si786DG/DRG/DSG

115

Quiescent Power Consumption

D1 = D2 = 0 V, FB5 = CS5 =

5 25 V

5.5

8.6

Quiescent Power Consumption

(both PWM controllers on)

5.25 V

FB3 = CS3 = 3.5 V

Si786DG/DRG/DSG

5.5

9.0

V+ Off Current

FB5 = CS5 = 5.25 V, VL Switched Over to FB5

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