SI9121DY-3-T1 VISHAY [Vishay Siliconix], SI9121DY-3-T1 Datasheet - Page 2

• Manufacturer Part Number: SI9121DY-3-T1
• Description: High-Voltage, Non-Isolated Buck-Boost Converter for ISDN Digital Phones
• Manufacturer: VISHAY [Vishay Siliconix]

ABSOLUTE MAXIMUM RATINGS (ALL VOLTAGES REFERENCED TO GND = 0 V)
V
V
V
I
V
Bypass, CS
(V
Storage Temperature
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation
of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE (ALL VOLTAGES REFERENCED TO GND = 0 V)
V
V
RECOMMENDED EXTERNAL COMPONENTS ( SEE TYPICAL APPLICATIONS CIRCUIT )
L = 68 mH, C
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2
Si9121
LX
Vishay Siliconix
SPECIFICATIONS
Output Voltage (with respect to GND = 0 V)
+5-V Converter
+3.3-V Converter
Line Regulation (with respect to GND = 0 V)
Line Regulation
V
V
UVLO
Under Voltage Lockout
Hysteresis
Soft-Start
Error Amplifier Start-Up Current
Oscillator
Switching Frequency
Error Amplifier
Transconductance
Clamp Voltage
Current Limit
Threshold Voltage
MOSFET Switch
N-Channel MOSFET
NEG
CS
CC
OUT
NEG
CC
LX
CC
CC
(peak current )
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(internally regulated)
− V
Bias Voltage
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(Internal Regulator)
CS
Parameter
) internal power MOSFET
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OUT
= 220 mF // 0.1 mF, CIN = 33 mF, C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
a
(All Voltages Are With Respect To V
Symbol
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
r
V
V
V
V
DS(on)
f
V
V
V
OSC
CC
DV
I
gm
OUT
OUT
NEG
SS
CC
CS
CL
−
V
V
NEG
NEG
BYPASS
Test Conditions (Internally Regulated)
−0.3 V to V
−0.3 V to V
Unless Otherwise Specified
= 0.1 mF, C
−10 V to −60 V
V
−65 to 150_C
V
NEG
NEG
CC
10 mA <I
10 mA <I
CC
−60 V v V
Internal Error Amplifier
Output Clamp Voltage
+ 13.2 V
V
+ 0.3 V
+ 8.5 V
NEG
+0.3 V
−63 V
70 V
VCC
6 V
V
3 A
= −10 to −60 V
Turn-On
OUT
LOAD
LOAD
= 1 mF, R
NEG
= 0 V
< 250 mA
< 250 mA
v −40 V
Operating Junction Temperature
Power Dissipation (Package)
8-Pin SOIC (Y Suffix)
Thermal Impedance (Q
8-Pin SOIC
Notes
a.
b.
V
Digital Inputs
SENSE
p
CC
NEG
Device mounted with all leads soldered or welded to PC board.
Derate 10 mW/_C above 25_C.
(externally supplied)
= 0.25 W, 0.5 W
Unless Otherwise Specified)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
b
Temp
Room
Room
Room
Room
Room
Room
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
JA
Full
Full
Full
Full
Full
Full
)
. . . . . . . . . . . . . . . .
a
a
b
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Min
4.80
3.17
0.57
7.5
6.6
80
10
c
−40 to 85_C
V
Limits
Typ
NEG
5.00
3.30
0.67
8.5
7.6
0.6
3.5
1.5
10
95
15
S-40708—Rev. C, 19-Apr-04
+ 9.5 V to V
d
Document Number: 71112
Max
5.20
3.43
0.77
110
9.5
8.7
2.5
20
1
NEG
c
0 V to V
100 _C/W
+ 12.0 V
1.25 W
150_C
Unit
umho
kHz
mA
%
W
V
V
V
V
V
V
V
CC