SS6341
High Performance, Triple-Output,
Auto-Tracking Combo Controller
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FEATURES
Provides Three Accurately Regulated Output
Voltages
Optimized Voltage-Mode PWM Control
Dual N-Channel MOSFET Synchronous Drivers
Fast Transient Response
Adjustable Over-Current Protection Using External
MOSFET R
DS(ON)
- No External Current Sense
Resistors Required.
Programmable Soft Start Function
200KHz Free-Running Oscillator
Robust Output Auto-Tracking Characteristics
Sink and Source Capabilities with External Circuit
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GENERAL DESCRIPTION
The SS6341 combines a synchronous
voltage-mode PWM controller with two linear
controllers, including the associated monitoring and
protection functions. It is able to power CPUs, GPUs,
memories, chipsets and multi-voltage applications.
The PWM controller regulates the output voltage
using a synchronous rectified step-down converter.
The built-in N-Channel MOSFET drivers also help to
simplify the design of the step-down converter. The
PWM controller features over-current protection
using the R
DS(ON)
of the external MOSFET,
improving efficiency and cost, as there is no
expensive current sense resistor required.
Two built-in adjustable linear controllers drive
external MOSFETs to form two linear regulators that
regulate power for multiple system I/Os. The output
voltage of both linear regulators can also be
adjusted by means of an external resistor divider.
Both linear regulators feature current-limiting. For
system I/Os requiring current less than 500mA, the
SS6340 is recommended as it saves one
external MOSFET.
The programmable soft-start design provides a
controlled output voltage rise, which limits the
current during power-on.
A shutdown function is also provided, for disabling
the combo controller.
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APPLICATIONS
Advanced PC motherboards
Information PCs
Servers and Workstations
Internet Appliances
LCD Monitor
PC Add-On Cards
DDR Termination
Rev.2.01 6/26/2003
www.SiliconStandard.com
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SS6341
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TYPICAL APPLICATION CIRCUIT
SS6341CS
+12VIN
+5VIN
4
14
OCSET
UGATE
PHASE
Q1
VCC
+
GND
SS
5
2
1
+3.3VIN
VIN2
7
16
GATE3
10
VOUT1
Q2
LGATE
+
VOUT3
+
FB3
11
15
PGND
+3.3VIN
FB1
13
GATE2
8
VOUT2
+
FB2
6
12
14
GND
3
SD
COMP1
Typical Application with Three Outputs
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ORDERING INFORMATION
SS6341CXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGING TYPE
S: SMALL OUTLINE
Example: SS6341CSTR
à
in SO-16 Package shipped in
Tape & Reel Packing
PIN CONFIGURATION
SO-16
TOP VIEW
PHASE 1
UGATE 2
SD 3
VCC 4
SS 5
FB2 6
VIN2 7
GATE2 8
16 LGATE
15 PGND
14 OCSET
13 FB1
12 COMP1
11 FB3
10 GATE3
9
GND
Rev.2.01 6/26/2003
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SS6341
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ABSOLUTE MAXIMUM RATINGS
Supply Voltage (VCC) ..................................................................................................................15V
UGATE ...................................................................................................... GND - 0.3V to V
CC
+ 0.3V
LGATE....................................................................................................... GND - 0.3V to V
CC
+ 0.3V
Input Output and I/O Voltage................................................................................... GND - 0.3V to 7V
Recommended Operating Conditions
Ambient Temperature Range ..........................................................................................0° C to 85°C
Maximum Operating Junction Temperature .............................................................................. 100°C
Supply Voltage, VCC .......................................................................................................... 15V±10%
Thermal Information
Thermal Resistance
θ
JA
(°C/W)
SOIC Package ........................................................................................................... 100°C/W
Maximum Junction Temperature (Plastic Package) .................................................................. 150°C
Maximum Storage Temperature Range...................................................................... -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) ........................................................................... 300°C
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TEST CIRCUIT
Refer to the APPLICATION CIRCUIT on page 14.
ELECTRICAL CHARACTERISTICS
PARAMETER
(V
cc
=12V, T
J
=25°C, Unless otherwise specified)
SYMBOL
MIN.
TYP.
MAX.
UNIT
TEST CONDITIONS
VCC SUPPLY CURRENT
Supply Current
UGATE, LGATE, GATE2 and
GATE3 open
I
CC
1.8
5
mA
POWER ON RESET
Rising VCC Threshold
Falling VCC Threshold
Rising VIN2 Under-Voltage
Threshold
VIN2 Under-Voltage
Hysteresis
Rising V
OCSET1
Threshold
V
OCSET
=4.5V
V
OCSET
=4.5V
VCC
THR
VCC
THF
VIN2
THR
VIN2
HYS
V
OCSETH
8.6
8.2
2.5
9.5
9.2
2.6
130
1.3
10.4
10.2
2.7
V
V
V
mV
V
Rev.2.01 6/26/2003
www.SiliconStandard.com
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SS6341
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ELECTRICAL CHARACTERISTICS
PARAMETER
(Continued)
SYMBOL
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
OSCILLATOR and REFERENCE
Free Running Frequency
FB1 Reference Voltage
FB2 Reference Voltage
FB3 Reference Voltage
F
V
REF1
V
REF2
V
REF3
170
1.287
1.245
1.250
200
1.300
1.270
1.275
230
1.313
1.295
1.300
KHz
V
V
V
LINEAR CONTROLLER
Regulation
Under-Voltage Level
0 < I
GATE2/3
< 10mA
FB2/3 falling
FB2/3
UV
-2.5
70
+2.5
80
%
%
PWM CONTROLLER ERROR AMPLIFIER
DC GAIN
Gain Bandwidth Product
Slew Rate
COMP1=10pF
GBWP
SR
76
11
6
dB
MHz
V/µS
PWM CONTROLLER GATE DRIVER
Upper Drive Source
Upper Drive Sink
Lower Drive Source
Lower Drive Sink
VCC=12V, V
UGATE
=11V
VCC=12V, V
UGATE
=1V
VCC=12V, V
LGATE
=11V
VCC=12V, V
LGATE
=1V
R
UGH
R
UGL
R
LGH
R
LGL
5.2
3.3
4.1
3
6.5
5
6
5
Ω
Ω
Ω
Ω
PROTECTION
Soft-Start Current
Chip Shutdown Soft Start
Threshold
I
SS
11
1.0
µA
V
Rev.2.01 6/26/2003
www.SiliconStandard.com
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SS6341
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PIN DESCRIPTIONS
Pin 1:
PHASE:
Over-current detection pin. Connect
to
the
source
of
the
external
This
pin
Pin 9:
GND:
high-side
N-MOSFET.
This pin can drive either a
Darlington NPN transistor or an
N-channel MOSFET.
Signal GND for IC. All voltage levels
are measured with respect to this
pin.
Linear Controller output drive pin.
This pin can drive either a
Darlington NPN transistor or an
N-channel MOSFET.
Negative feedback pin for the linear
controller error amplifier. Connect
this pin to a resistor divider to set the
linear controller output voltage.
External
compensation
pin.
detects the voltage drop across the
high-side N-MOSFET R
DS(ON)
for
over-current protection.
Pin 2:
UGATE: External high-side N-MOSFET gate
drive pin. Connect to the gate of the
external high-side N-MOSFET.
Pin 3:
SD:
To shut down the system, active high
or floating. If connecting a resistor to
ground, keep the resistor less than
4.7KΩ.
Pin 4:
VCC:
The chip power supply pin. It also
provides the gate bias charge for all
the MOSFETs controlled by the IC.
Recommended supply voltage is
12V.
Pin 5:
SS:
Soft-start pin. Connect a capacitor
from
this
pin
to
ground.
This
capacitor, along with an internal
10µA (typically) current source, sets
the soft-start interval of the converter.
Pulling this pin low will shut down the
IC.
Pin 6:
FB2:
Connect this pin to a resistor divider
to set the linear regulator output
voltage.
Pin 10: GATE3:
Pin 11: FB3
Pin 12: COMP1
Connect to the error amplifier output
and PWM comparator. An RC
network is connected to FB1 to
compensate the voltage control
feedback loop of the converter.
Pin 13: FB1
The error amplifier inverting input pin.
The FB1 pin and COMP1 pin are
used
to
compensate
the
voltage-control feedback loop.
Pin 14: OCSET: Current limit sense pin. Connect a
resistor R
OCSET
from this pin to the
drain
of
the
external
an
high-side
internal
N-MOSFET.
R
OCSET
,
200µA current source (I
OCSET
), and
the upper N-MOSFET on-resistance
(R
DS(ON)
) set the over-current trip
point according to the following
equation:
Pin 7: VIN2:
Connect this pin to a suitable
3.3V source. Additionally, this
pin is used to monitor the 3.3V
supply. If the voltage drops
below 2.6V (typically) following a
start-up cycle, the chip shuts
down. A new soft-start cycle is
initiated upon the return of the
3.3V
supply
above
the
under-voltage threshold.
Linear Controller output drive pin.
I
PEAK
=
Pin 15: PGND:
I
OCSET
×
R
OCSET
R
DS(ON)
Driver power GND pin. Connect to a
low impedance ground plane close
to the lower N-MOSFET source.
Pin 8:
GATE2:
Pin 16: LGATE:
Lower N-MOSFET gate drive pin.
Rev.2.01 6/26/2003
www.SiliconStandard.com
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