a. Device mounted with all leads soldered or welded to PC board.
b. Derate 9.52 mW/_C above 70_C.
New Product
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.
SPECIFICATIONS
Test Conditions
Parameter
3.3-V Buck Controller
Total Regulation (Line, Load, and Temperature)
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
V
IN
= 6 to 30 V, 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
mH,
C = 330
mF
R
SENSE
= 20 mW
90
125
50
65
3.22
3.32
3.42
±0.5
±0.5
160
V
%
mV
kHz
_
V
IN
= 15 V , I
VL
= I
REF
= 0 mA
T
A
= 0_C to 90_C, All Controllers ON
Limits
Min
a
Typ
b
Max
a
Unit
5-V Buck Controller
Total Regulation (Line, Load, and Temperature)
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
V
IN
= 6 to 30 V, 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
mH,
C = 330
mF
R
SENSE
= 20 mW
90
125
50
65
4.87
5.02
5.17
±0.5
±0.5
160
V
%
mV
kHz
_
5- to 12-V Buck-Boost Controller
Total Regulation (Line, Load, and Temperature)
Output Voltage Set to 12 V
Line Regulation
Load Regulation
Current Limit
Bandwidth
Phase Margin
V
IN
= 6 to 30 V, 0 < V
CSP
– V
CSN
< 300 mV
R
5
= 26.4 kW, R
6
= 10 kW (See Figure 1)
V
IN
= 6 to 30 V
0 < V
CSP
– V
FBN
< 300 mV
V
CSP
– V
CSN
L = 10
mH,
C = 100
mF
R
SENSE
= 100 mW, C
comp
= 120 pF
330
410
10
65
11.4
12.0
12.6
±0.5
±0.5
500
V
%
mV
kHz
_
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
www.vishay.com
FB
5
Rising Edge
4.2
75
All Controllers OFF, V
IN
>5.5 V, 0 <I
L
<30 mA
V
L
Falling Edge
4.7
3.6
75
4.7
5.5
4.2
V
mV
V
mV
Document Number: 71446
S-20642—Rev. B, 13-May-02
2
Si9138
New Product
SPECIFICATIONS
Test Conditions
Parameter
Reference
REF Output
REF Load Regulation
No External Load
0 to 1 mA
3.24
3.30
30
3.36
75
V
mV
V
IN
= 15 V , I
VL
= I
REF
= 0 mA
T
A
= 0_C to 90_C, All Controllers ON
Vishay Siliconix
Limits
Min
a
Typ
b
Max
a
Unit
Supply Current
Supply Current*Shutdown
Supply Current*Operation
All Converters OFF, No Load
All Controllers ON, No Load, f
OSC
= 300 kHz
25
1100
60
1800
mA
m
Oscillator
Oscillator Frequency
Maximum Duty Cycle
270
92
300
95
330
kHz
%
Fault Detection 3.3-V and 5-V Outputs
Overvoltage Trip Threshold
Overvoltage-Fault Propagation Delay
Output Undervoltage Threshold
Output Undervoltage Lockout Time
With Respect To Unloaded Output Voltage
CS3 or CS5 Driven 2% Above Overvoltage Trip
Threshold
With Respect to Unloaded Output Voltage
From each SMPS Enabled
–40
16
6
10
1.5
–50
20
–20
24
14
%
ms
%
ms
RESET
RESET Start Threshold
RESET Propagation Delay (Falling)
RESET Delay Time (Rising)
With Respect To Unloaded Output Voltage
Rising Edge
Falling Edge, FB3 or FB5 Driven 2% Above Overvol-
tage or 2% Below Undervoltage Lockout Thresholds
With Respect to 2nd SMPS Lockout Time Done
92
–5.5
1.5
107
122
%
ms
ms
Inputs and Outputs
Feedback Input Leakage Current
Input Leakage Current
Gate Driver Sink/Source Current (Buck)
Gate Driver On-Resistance (Buck)
Gate Driver Sink/Source Current (Buck-Boost)
Gate Driver On-Resistance (Buck-Boost)
RESET Output Low Voltage
RESET Output High Leakage
FBFY = 3.3 V
ON3, ON5, V
IN
= 0 V or V
L
DL3, DH3, DL5, DH5 Forced to 2 V
High or Low
DHFY, DLFY Forced to 2 V
High or Low
RESET, I
SINK
= 4 mA
RESET = 5 V
1
2
0.2
15
0.4
1
7
1
"1
mA
m
A
W
A
W
V
mA
ON3, ON5
Logic Low
Logic High
V
IL
V
IH
2.4
0.8
V
Notes
a. The algebraic convention is used 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, and are measured at T
A
= 25_C.
Document Number: 71446
S-20642—Rev. B, 13-May-02
www.vishay.com
3
Si9138
Vishay Siliconix
PIN CONFIGURATION
RESET
FBFY
BSTFY
DHFY
LXFY
DLFY
CSP
CSN
COMP
GND
REF
ON3
ON5
CS
5
1
2
3
4
5
6
7
8
9
10
11
12
13
14
SSOP-28
Top View
28
27
26
25
24
23
22
21
20
19
18
17
16
15
CS
3
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
New Product
ORDERING INFORMATION
Part Number
Si9138LG
Temperature Range
0 to 90_C
V
OUT
3.3 V, 5 V, 5 to 12 V ADJ
Evaluation Board
Si9138DB
Temperature Range
0 to 90_C
Board Type
Surface Mount
PIN DESCRIPTION
Pin
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
RESET
FBFY
BSTFY
DHFY
LXFY
DLFY
CSP
CSN
COMP
GND
REF
ON3
ON5
CS
5
DH
5
LX
5
BST
5
DL
5
PGND
FB
5
V
L
V
IN
DL
3
BST
3
LX
3
DH
3
FB
3
CS
3
Description
Open drain NMOS output active-low timed reset output. RESET swings GND to V
L
. Goes high after a fixed 32,000 clock
cycle delay following proper power-up of all supply outputs indicating Power_Good.
Feedback for Buck-Boost controller. Normally connected to an external resistor divider used to set the Buck-Boost output
voltage.
Boost capacitor connection for Buck-Boost controller.
Gate-drive output for Buck-Boost high-side MOSFET.
Inductor connection for Buck-Boost controller.
Gate-drive output for Buck-Boost low-side MOSFET.
Current sense positive input for Buck-Boost controller.
Current sense negative input for Buck-Boost controller.
Buck-Boost compensation connection, if required.
Analog ground.
3.3-V internal reference.
Logic High enables the 3.3 V controller.
Logic High enables the 5 V and the 5-12 V adjustable controllers
Current sense input for 5-V buck controller.
Gate-drive output for 5-V buck high-side MOSFET.
Inductor connection for buck 5-V.
Boost capacitor connection for 5-V buck controller.
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 controller.
Inductor connection for 3.3-V buck low-side MOSFET.
Gate-drive output for 3.3-V buck high-side MOSFET.
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