Along with the SMBUS interface, the Si9135 provides
programmable output selection capability.
The Si9135 is available in both standard and lead (Pb)-free
28-pin SSOP packages and specified to operate over the
extended commercial (0 °C to 90 °C) temperature range.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Up to 95 % Efficiency
3 % Total Regulation (Each Controller)
5.5 V to 30 V Input Voltage Range
3.3 V, 5 V, and 12 V Outputs
200 kHz/300 kHz Low-Noise Frequency Operation
Precision 3.3 V Reference Output
30 mA Linear Regulator Output
SMBUS Interface
High Efficiency Pulse Skipping Mode Operation at
Light Load
Only Three Inductors Required - No Transformer
LITTLE FOOT
®
Optimized Output Drivers
Internal Soft-Start
Synchronizable
Minimal External Control Components
28-Pin SSOP Package
FUNCTIONAL BLOCK DIAGRAM
V
IN
V
L
(5.0 V)
5-V
Linear
Regulator
3.3 - V
Voltage
Reference
V
REF
(+ 3.3 V)
+ 3.3 V
3.3-V
SMPS
5-V
SMPS
+5V
12-V SMPS
+ 12 V
SMBUS Clock Line
On/Off Control
SMBUS Data Line
Document Number: 70817
S11-0975-Rev. D, 16-May-11
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1
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9135
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Parameter
V
IN
to GND
P
GND
to GND
V
L
to GND
BST
3
, BST
5
, BSTFY to GND
V
L
Short to GND
LX
3
to BST
3
; LX
5
to BST
5
; LXFY to BST
Inputs/Outputs to GND (SYNC, CS
3
, CS
5
, CSP, CSN)
SDA, SCL
DL3, DL5, DLFY to PGND
DH3 to LX
3
, DH5 to LX
5
, DHFY to LXFY
Continuous Power Dissipation (T
A
= 90 °C)
a
Operating Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 Sec.)
Notes:
a. Device Mounted with all leads soldered or welded to PC board.
b. Derate 9.52 mW/°C above 90 °C.
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.
Limit
- 0.3 to + 36
±2
- 0.3 to + 6.5
- 0.3 to + 36
Continuous
- 6.5 to 0.3
- 0.3 V to (V
L
+ 0.3)
- 0.3 to + 5.5
- 0.3 V to (V
L
+ 0.3)
- 0.3 V to (BSTX + 0.3)
28-Pin SSOP
b
572
0 to 90
- 40 to 125
300
Unit
V
V
mW
°C
SPECIFICATIONS
Parameter
3.3 V Buck Controller
Total Regulation (Line, Load, and Temperature)
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
5 V Buck Controller
Total Regulation (Line, Load, and Temperature)
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
12 V Flyback Controller
Total Regulation (Line, Load, and Temperature)
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
V
IN
= 6 to 30, 0 < V
CSP
- V
CSN
< 300 mV
V
IN
= 6 to 30 V
0 < V
CSP
- V
FBN
< 300 mV
V
CSP
- V
CSN
L = 10 µH, C = 100 µF
R
SENSE
= 100 m, C
comp
= 120 pF
330
410
10
65
11.4
12.0
12.6
± 0.5
± 0.5
510
V
%
mV
kHz
°
V
IN
= 6 to 30, 0 < V
CS5
- V
FB5
< 90 mV
V
IN
= 6 to 30 V
0 < V
CS5
- V
FB5
< 90 mV
V
CS5
- V
FB5
L = 10 µH, C = 330 µF
R
SENSE
= 20 m
90
125
50
60
4.88
5.03
5.18
± 0.5
± 0.5
160
V
%
mV
kHz
°
V
IN
= 6 to 30, 0 < V
CS3
- V
FB3
< 90 mV
V
IN
= 6 to 30 V
0 < V
CS3
- V
FB3
< 90 mV
V
CS3
- V
FB3
L = 10 µH, C = 330 µF
R
SENSE
= 20 m
90
125
50
65
3.23
3.33
3.43
± 0.5
± 0.5
160
V
%
mV
kHz
°
Specific Test Conditions
V
IN
= 15 V, I
VL
= I
REF
= 0 mA
T
A
= 0 °C to 90 °C, All Converters ON
Limits
Min.
a
Typ.
b
Max.
a
Unit
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Document Number: 70817
S11-0975-Rev. D, 16-May-11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9135
Vishay Siliconix
SPECIFICATIONS
Parameter
Internal Regulator
V
L
Output
V
L
Fault Lockout Voltage
V
L
Fault Lockout Hysteresis
V
L
/FB5 Switchover Voltage
V
L
/FB5 Switchover Hysteresis
Reference
REF Output
REF Load Regulation
Supply Current
Supply Current - Shutdown
Supply Current - Operation
Oscillator
Oscillator Frequency
SYNC High-Pulse Width
SYNC Low-Pulse Width
SYNC Rise/Fall Range
SYNC V
IL
SYNC V
IH
Oscillator SYNC Range
Maximum Duty Cycle
Outputs
Gate Driver Sink/Source Current (Buck)
Gate Driver On-Resistance (Buck)
Gate Driver Sink/Source Current (Flyback)
Gate Driver On-Resistance (Flyback)
SCL, SDA
V
IL
V
IH
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.
1.4
0.6
V
DL3, DH3, DL5, DH5 Forced to 2 V
High or Low
DHFY, DLFY Forced to 2 V
High or Low
1
2
0.2
15
7
A
A
SYNC tied to GND or V
L
SYNC tied to REF
V
L
- 0.5
250
92
89
95
92
400
SYNC tied to REF
SYNC tied to GND or V
L
270
180
200
200
200
0.8
V
kHz
%
nsec
300
200
330
220
kHz
All Converters OFF, No Load
All Converters ON, No Load, F
OCS
= 200 kHz
35
1100
60
1800
µA
No External Load
0 to 1 mA
3.24
3.30
30
3.36
75
V
mV
4.2
75
All Converters OFF, V
IN
> 5.5 V, 0 < I
L
< 30 mA
4.7
3.6
75
4.7
5.5
4.2
V
mV
V
mV
Specific Test Conditions
V
IN
= 15 V, I
VL
= I
REF
= 0 mA
T
A
= 0 °C to 90 °C, All Converters ON
Limits
Min.
a
Typ.
b
Max.
a
Unit
Document Number: 70817
S11-0975-Rev. D, 16-May-11
www.vishay.com
3
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9135
Vishay Siliconix
PIN CONFIGURATION
SSOP-28
CS
3
FBFY
BSTFY
DHFY
LXFY
DLFY
CSP
CSN
GND
COMP
REF
SYNC
SCL
SDA
1
2
3
4
5
6
7
8
9
10
11
12
12
14
Top View
28
27
26
25
24
23
22
21
20
19
18
17
16
15
FB
3
DH
3
LX
3
BST
3
DL
3
V
IN
V
L
FB
5
PGND
DL
5
BST
5
LX
5
DH
5
CS
5
ORDERING INFORMATION
Part Number
Si9135LG
Si9135LG-T1
Si9135LG-T1-E3
Lead (Pb)-free
Part Number
Temperature
Range
0 to 90 °C
V
OUT
3.3 V, 5 V, 12 V
PIN DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Symbol
CS
3
FBFY
BSTFY
DHFY
LXFY
DLFY
CSP
CSN
GND
COMP
REF
SYNC
SCL
SDA
CS
5
DH5
LX
5
BST
5
DL
5
PGND
FB
5
V
L
V
IN
DL
3
BST
3
LX
3
DH
3
FB
3
Current sense input for 3.3 V buck.
Feedback for flyback.
Boost capacitor connection for flyback converter.
Gate-drive output for flyback high-side MOSFET.
Inductor connection for flyback converter.
Gate-drive output for flyback low-side MOSFET.
Current sense positive input for flyback converter.
Current sense negative input for flyback converter.
Analog ground.
Flyback compensation connection, if required.
3.3 V internal reference.
Oscillator synchronization inputs.
SMBUS clock line.
SMBUS data line.
Current sense input for 5 V buck controller.
Inductor connection for buck 5 V.
Gate-drive output for 5 V buck high-side MOSFET.
Boost capacitor connection for 5 V buck converter.
Gate-drive output for 5 V buck low-side MOSFET.
Power ground.
Feedback for 5 V buck.
5 V logic supply voltage for internal circuitry.
Input voltage
Gate-drive output for 3.3 V buck low-side MOSFET.
Boost capacitor connection for 3.3 V buck converter.
Inductor connection for 3.3 V buck low-side MOSFET.
Gate-drive output for 3.3 V buck high-side MOSFET.
Feedback for 3.3 V buck.
Description
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Document Number: 70817
S11-0975-Rev. D, 16-May-11
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Si9135
Vishay Siliconix
TYPICAL CHARACTERISTICS
(25 °C unless otherwise noted)
100
Frequency = 200 kHz
90
V
IN
= 6 V
Efficiency (%)
80
30 V
70
5 V On, 12 V Off
60
Efficiency (%)
15 V
100
Frequency = 200 kHz
90
V
IN
= 6 V
15 V
80
30 V
70
3.3 V Off, 12 V Off
60
50
0.001
0.01
0.1
Current (A)
1
10
50
0.001
0.01
0.1
Current (A)
1
10
Efficiency vs. 3.3 V Output Current
Efficiency vs. 5.0 V Output Current
85
Frequency = 200 kHz
80
6V
75
Efficiency (%)
30 V
V
IN
= 15 V
70
65
5 V On, 3.3 V Off
60
55
0.001
0.01
Current (A)
0.1
1
Efficiency vs. 12 V Output Current
Document Number: 70817
S11-0975-Rev. D, 16-May-11
www.vishay.com
5
This document is subject to change without notice.
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
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