AIC AIC1340 High performance, tripple-ouput, auto-tracking combo controller Datasheet

AIC1340
High Performance, Tripple-Ouput, AutoTracking Combo Controller
n FEATURES
n GENERAL DESCRIPTION
l
Provide Triple Accurate Regulated Voltages
The AIC1340 combines a synchronous voltage mode
l
Optimized Voltage-Mode PWM Control
PWM controller with a low dropout linear regulator
l
Dual N-Channel MOSFET Synchronous Drivers
and a linear controller as well as the monitoring and
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Fast Transient Response
protection functions in this chip. The PWM control-
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Adjustable Over Current Protection using RDS(on) .
No External Current Sense Resistor Required.
ler regulates the output voltage with a synchronous
rectified step-down converter. The built-in N-Channel
MOSFET drivers also help to simplify the design of
l
Programmable Softstart Function
l
200KHz Free-Running Oscillator
l
Robust Outputs Auto-Tracking Characteristics
ler features over current protection using RDS(on) . It
l
Sink and Source Capabilities with External Circuit
improves efficiency and saves cost, as there is no
step-down converter. It is able to power CPUs,
GPUs, memories, and chipsets. The PWM control-
expensive current sense resistor required.
n APPLICATIONS
l
Advanced PC Mboards
l
Information PCs
ternal MOSFET to form a linear regulator that regu-
l
Servers and Workstations
lates power for system I/O. The built-in adjustable
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Internet Appliances
low dropout linear regulator can supply current up to
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PC Add-On Cards
500mA for supplying another system I/O. Output
l
DDR Termination.
voltage of both linear regulators can also be adjust-
The built-in adjustable linear controller drives an ex-
ed by means of the external resistor divider. Both
linear regulators feature current limit. With higher
load current required from the low dropout linear
regulator, the AIC1341 is recommended.
The Shutdown function is also provided for disable
the combo controller.
Analog Integrations Corporation
www.analog.com.tw
DS-1340-00 May 24, 01
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
TEL: 886-3-5772500
FAX: 886-3-5772510
1
AIC1340
n TYPICAL APPLICATION CIRCUIT
+12VIN
+5VIN
VCC 4
14
OCSET
+
GND
SS
5
2
UGATE
1
PHASE
VOUT1
+3.3VIN
VIN2
7
16
GATE3
VOUT3
10
FB3
15
11
1.5V
+
LGATE
PGND
+
VOUT2
FB1
VOUT2 8
13
2.5V
+
FB2
6
12
14
COMP1
3
SD
GND
Typical Triple-Output Application
n ORDERING INFORMATION
ORDER NUMBER
AIC1340-XX
PACKAGING TYPE
S: SMALL OUTLINE
TEMPERATURE RANGE
C: 0° C~+70 ° C
AIC1340CS
(SO16)
PIN CONFIGURATION
PHASE
1
16 LGATE
UGATE
2
15 PGND
SD 3
VCC 4
14 OCSET
13 FB1
SS
5
12 COMP1
FB2
6
11 FB3
VIN2 7
VOUT2 8
10 GATE3
9 GND
2
AIC1340
n ABSOLUTE MAXIMUM RATING
Absolute Maximum Ratings
Supply Voltage (VCC)..................................................................................................... 15V
UGATE.........................................................................................GND - 0.3V to VCC + 0.3V
LGATE .........................................................................................GND - 0.3V to VCC + 0.3V
Input Output and I/O Voltage ....................................................................... GND - 0.3V to 7V
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 θJA (°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
n TEST CIRCUIT
Refer to APPLICATION CIRCUIT.
3
AIC1340
n ELECTRICAL CHARACTERISTICS
(Vcc=12V, T J=25°C, Unless otherwise
specified)
PARAMETER
TEST CONDITIONS
SYMBOL
UGATE, LGATE, GATE3 and
VOUT2 open
ICC
MIN.
TYP.
MAX.
UNIT
1.8
3
mA
VCC SUPPLY CURRENT
Supply Current
POWER ON RESET
Rising VCC Threshold
VOCSET=4.5V
VCCTHR
8.6
9.5
10.4
V
Falling VCC Threshold
VOCSET=4.5V
VCCTHF
8.2
9.2
10.2
V
Rising VIN2 Under-Voltage
Threshold
VIN2THR
2.5
2.6
2.7
V
VIN2 Under-Voltage Hysteresis
VIN2HYS
130
mV
Rising VOCSET1 Threshold
VOCSETH
1.3
V
OSCILLATOR
Free Running Frequency
F
170
∆VOSC
Ramp. Amplitude
200
230
1.3
KHz
VP-P
REFERENCE
FB2 Reference Voltage
VREF2
1.240
1.265
1.290
V
FB3 Reference Voltage
VREF3
1.250
1.275
1.300
V
+1
%
82
%
LINEAR REGULATOR
Regulation
10mA<IOUT2<150mA
Under-Voltage Level
FB2 falling
-1
FB2UV
Over-Current Protection
70
430
Over-Current Protection
During Start-up
570
mA
750
mA
LINEAR CONTROLLER
Regulation
0 < IGATE3 < 10mA
Under-Voltage Level
FB3 falling
-2.5
FB3UV
70
+2.5
%
80
%
4
AIC1340
n ELECTRICAL CHARACTERISTICS
PARAMETER
TEST CONDITIONS
(Continued)
SYMBOL
MIN.
TYP.
MAX.
UNIT
PWM CONTROLLER ERROR AMPLIFIER
DC GAIN
Gain Bandwidth Product
Slew Rate
COMP1=10pF
76
dB
GBWP
11
MHz
SR
6
V/µS
PWM CONTROLLER GATE DRIVER
Upper Drive Source
VCC=12V, VUGATE=11V
RUGH
5.2
6.5
Ω
Upper Drive Sink
VCC=12V, VUGATE =1V
RUGL
3.3
5
Ω
Lower Drive Source
VCC=12V, VLGATE=11V
RLGH
4.1
6
Ω
Lower Drive Sink
VCC=12V, VLGATE=1V
RLGL
3
5
Ω
VOCSET=4.5V DC
IOCSET
200
230
µA
PROTECTION
OCSET Current Source
Soft-Start Current
170
ISS
µA
11
Chip Shutdown Soft Start
Threshold
1.0
V
n PIN DESCRIPTIONS
Pin 1:
provides the gate bias charge for
PHASE: Over-current detection pin. Con-
all the MOSFETs controlled by
nect the PHASE pin to source of
the
external
high-side
the IC. Recommended supply
N-
voltage is 12V.
MOSFET. This pin detects the
voltage drop across the high-side
Pin 2:
Pin 5:
SS:
Soft-start pin. Connect a capaci-
N-MOSFET RDS(ON) for over-
tor from this pin to ground. This
current protection.
capacitor, along with an internal
UGATE: External
high-side
10µA (typically) current source,
N-MOSFET
sets the soft-start interval of the
gate drive pin. Connect UGATE
converter.
to gate of the external high-side
Pulling this pin low will shut down
N-MOSFET.
the IC.
Pin 3:
SD:
To shut down the system, active
high or floating.
Pin 6:
FB2:
Connect this pin to a resistor divider to set the linear regulator
Pin 4:
VCC:
The chip power supply pin. It also
output voltage.
5
AIC1340
Pin 7:
VIN2:
This pin supplies power to the in-
pin is connected to error amplifier
ternal regulator. Connect this pin
output and PWM comparator. An
to a suitable 3.3V source.
RC network is connected to FB1
in to compensate the voltage
Additionally, this pin is used to
control feedback loop of the con-
monitor the 3.3V supply. If, fol-
verter.
lowing a start-up cycle, the voltage drops below 2.6V (typically),
pin. the FB1 pin and COMP1 pin
start cycle is initiated upon return
are used to compensate the volt-
of the 3.3V supply above the un-
age-control feedback loop.
Pin 14: OCSET: Current limit sense pin. Connect
VOUT2: Output of the linear regulator.
a resistor ROCSET from this pin to
Supplies current up to 500mA.
Pin 9:
GND:
The error amplifier inverting input
the chip shuts down. A new soft-
der-voltage threshold.
Pin 8:
Pin 13: FB1
the drain of the external high-side
N-MOSFET. ROCSET, an internal
Signal GND for IC. All voltage
200µA current source (IOCSET),
levels are measured with respect
and the upper N-MOSFET on-
to this pin.
resistance (RDS(ON)) set the overPin 10: GATE3: Linear Controller output drive pin.
current trip point according to the
This pin can drive either a Dar-
following equation:
lington NPN transistor or a N-
I PEAK =
channel MOSFET.
Pin 11: FB3
I OCSET × ROCSET
RDS(ON)
Negative feedback pin for the
linear controller error amplifier
connect this pin to a resistor divider to set the linear controller
output voltage.
Pin 12: COMP1 External compensation pin. This
Pin 15: PGND:
Driver power GND pin. PGND
should be connected to a low impedance ground plane in close to
lower N-MOSFET source.
Pin 16: LGATE: Lower N-MOSFET gate drive pin.
6
AIC1340
n PACKAGE DIMENSIONS
16 LEAD PLASTIC SO (300 mil) (unit: mm)
D
E
H
SYMBOL
MIN
MAX
A
2.35
2.65
A1
0.10
0.30
B
0.33
0.51
C
0.23
0.32
D
10.10
10.50
E
7.40
7.60
e
e
1.27(TYP)
A
A1
l
B
c
L
H
10.00
10.65
L
0.40
1.27
7
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