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PDF AIC1340 Data sheet ( Hoja de datos )
| Número de pieza | AIC1340 | |
| Descripción | High Performance/ Tripple-Ouput/ Auto-Tracking Combo Controller | |
| Fabricantes | Analog Intergrations Corporation | |
| Logotipo |  |
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AIC1340
High Performance, Tripple-Ouput, Auto-
Tracking Combo Controller
n FEATURES
l Provide Triple Accurate Regulated Voltages
l Optimized Voltage-Mode PWM Control
l Dual N-Channel MOSFET Synchronous Drivers
l Fast Transient Response
l Adjustable Over Current Protection using RDS(on).
No External Current Sense Resistor Required.
l Programmable Softstart Function
l 200KHz Free-Running Oscillator
l Robust Outputs Auto-Tracking Characteristics
l Sink and Source Capabilities with External Circuit
n APPLICATIONS
l Advanced PC Mboards
l Information PCs
l Servers and Workstations
l Internet Appliances
l PC Add-On Cards
l DDR Termination.
n GENERAL DESCRIPTION
The AIC1340 combines a synchronous voltage mode
PWM controller with a low dropout linear regulator
and a linear controller as well as the monitoring and
protection functions in this chip. The PWM control-
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
step-down converter. It is able to power CPUs,
GPUs, memories, and chipsets. The PWM control-
ler features over current protection using RDS(on). It
improves efficiency and saves cost, as there is no
expensive current sense resistor required.
The built-in adjustable linear controller drives an ex-
ternal MOSFET to form a linear regulator that regu-
lates power for system I/O. The built-in adjustable
low dropout linear regulator can supply current up to
500mA for supplying another system I/O. Output
voltage of both linear regulators can also be adjust-
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
TEL: 886-3-5772500
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
FAX: 886-3-5772510
1
1 page  
AIC1340
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER
TEST CONDITIONS
SYMBOL MIN. TYP. MAX. UNIT
PWM CONTROLLER ERROR AMPLIFIER
DC GAIN
76 dB
Gain Bandwidth Product
GBWP
11 MHz
Slew Rate
COMP1=10pF
PWM CONTROLLER GATE DRIVER
SR 6 V/µS
Upper Drive Source
Upper Drive Sink
Lower Drive Source
Lower Drive Sink
PROTECTION
VCC=12V, VUGATE=11V
VCC=12V, VUGATE =1V
VCC=12V, VLGATE=11V
VCC=12V, VLGATE=1V
RUGH
RUGL
RLGH
RLGL
5.2 6.5
3.3 5
4.1 6
35
Ω
Ω
Ω
Ω
OCSET Current Source
Soft-Start Current
VOCSET=4.5V DC
IOCSET
ISS
170 200 230
11
µA
µA
Chip Shutdown Soft Start
Threshold
1.0 V
n PIN DESCRIPTIONS
Pin 1:
PHASE: Over-current detection pin. Con-
nect the PHASE pin to source of
the external high-side N-
MOSFET. This pin detects the
voltage drop across the high-side
N-MOSFET RDS(ON) for over-
current protection.
Pin 2:
UGATE: External high-side N-MOSFET
gate drive pin. Connect UGATE
to gate of the external high-side
N-MOSFET.
Pin 3: SD:
To shut down the system, active
high or floating.
Pin 4: VCC: The chip power supply pin. It also
Pin 5: SS:
Pin 6: FB2:
provides the gate bias charge for
all the MOSFETs controlled by
the IC. Recommended supply
voltage is 12V.
Soft-start pin. Connect a capaci-
tor 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.
Connect this pin to a resistor di-
vider to set the linear regulator
output voltage.
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet AIC1340.PDF ] | |
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