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PDF RT9183 Data sheet ( Hoja de datos )
| Número de pieza | RT9183 | |
| Descripción | Ultra Low Dropout 1.5A Linear Regulator | |
| Fabricantes | RichTek | |
| Logotipo |  |
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Preliminary
RT9183
Ultra Low Dropout 1.5A Linear Regulator
General Description
The RT9183 series are high performance linear voltage
regulators that provide ultra low-dropout voltage, high output
current with low ground current. It operates from an input
of 2.3V to 5.5V and provides output current up to 1.5A
thus is suitable to drive digital circuits requiring low voltage
at high currents.
The RT9183 has superior regulation over variations in line
and load. Also it provides fast respond to step changes in
load. Other features include over-current and over-
temperature protection. The adjustable version has enable
pin to reduce power consumption in shutdown mode.
The devices are available in fixed output voltages of 1.8V,
2.5V, 3.3V and as an adjustable device with a 0.8V reference
voltage. The RT9183 regulators are available in 3-lead
SOT-223 and TO-263 packages (fixed output only for the
3-lead option). Also available are 5-lead TO-263 and fused
SOP-8 packages with two external resistors to set the
output voltage ranges from 0.8V to 4.5V.
Ordering Information
RT9183 -
Package Type
G : SOT-223
S : SOP-8
M : TO-263
M5 : TO-263-5
Operating Temperature Range
C : Commercial Standard
Output Voltage
Defauit : Adjustable
18 : 1.8V
25 : 2.5V
33 : 3.3V
H : Chip Enable High
L : Chip Enable Low
Features
330mV Dropout @ 1.5A
380µA Low Ground Pin Current
Excellent Line and Load Regulation
0.1mA Quiescent Current in Shutdown Mode
Guaranteed 1.5A Output Current
Fixed Output Voltages: 1.8V, 2.5V, 3.3V
Adjustable Output Voltage from 0.8V to 4.5V
Over-Temperature/Over-Current Protection
Applications
Battery-Powered Equipment
Mother Board/Graphic Card
Peripheral Cards
PCMCIA Card
Pin Configurations
(TOP VIEW)
1 23
9,1 *1' 9287
7$%
SOT-223
EN
VIN
VOUT
ADJ
8
27
36
45
SOP-8
GND
GND
GND
GND
3
2
1
TO-263
9287
*1' 7$%
9,1
5
4
3
2
1
TO-263-5
$'-
9287
*1' 7$%
9,1
(1
DS9183-02 December 2003
www.richtek.com
1
1 page  
Preliminary
RT9183
Parameter
Symbol
Test Conditions
Min Typ Max Units
ADJ
Reference Voltage Tolerance
Adjust Pin Current
Adjust Pin Threshold
VREF
IADJ
VTH(ADJ)
VADJ = VREF
0.784
--
0.05
0.8 0.816
10 100
0.1 0.2
V
nA
V
Note 1. 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.
Note 2. Devices are ESD sensitive. Handling precaution recommended. The human body model is a 100pF capacitor
discharged through a 1.5KΩ resistor into each pin.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its
nominal value measured at 0.7V differential.
Note 5. Regulation is measured at constant junction temperature by using a 20mS current pulse. Devices are tested
for load regulation in the load range from 10mA to 1.5A.
Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT
under no load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current
plus the ground pin current.
Note 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown
signal (VEN >1.8V ). It is measured with VIN = 5.5V.
DS9183-02 December 2003
www.richtek.com
5
5 Page 
Preliminary
RT9183
The final operating junction temperature for any set of
conditions can be estimated by the following thermal
equation:
PD (MAX) = ( TJ (MAX) − TA ) / θJA
Where TJ (MAX) is the maximum junction temperature of
the die (125°C) and TA is the maximum ambient
temperature. The junction to ambient thermal resistance
(θJA) for SOP-8 package at recommended minimum
footprint is 42°C/W, 40°C/W for SOT-223 package and
25°C/W for TO-263 package (θJA is layout dependent).
Visit our website in which “Recommended Footprints for
Soldering Surface Mount Packages” for detail.
PCB LAYOUT
Good board layout practices must be used or instability
can be induced because of ground loops and voltage drops.
The input and output capacitors MUST be directly
connected to the input, output, and ground pins of the
device using traces which have no other currents flowing
through them.
The best way to do this is to layout CIN and COUT near the
device with short traces to the VIN, VOUT, and ground pins.
The regulator ground pin should be connected to the
external circuit ground so that the regulator and its
capacitors have a“ single point ground” .
It should be noted that stability problems have been seen
in applications where “ vias ” to an internal ground plane
were used at the ground points of the device and the input
and output capacitors. This was caused by varying ground
potentials at these nodes resulting from current flowing
through the ground plane. Using a single point ground
technique for the regulator and it's capacitors fixed the
problem. Since high current flows through the traces going
into VIN and coming from VOUT, Kelvin connect the capacitor
leads to these pins so there is no voltage drop in series
with the input and output capacitors.
Optimum performance can only be achieved when the
device is mounted on a PC board according to the diagram
below:
GND
+
EN
ADJ
VOUT
GND
VIN
GND
SOP-8 Board Layout
ADJUSTABLE OPERATION
The adjustable version of the RT9183 has an output voltage
range of 0.8V to 4.5V. The output voltage is set by the
ratio of two external resistors as shown in Figure 2. The
value of R2 should be less than 80k to maintain regulation.
In critical applications, small voltage drop is caused by
the resistance (RT) of PC traces between the ground pin of
the device and the return pin of R2 (See Figure 4 shown on
next page). Note that the voltage drop across the external
PC trace will add to the output voltage of the device.
Optimum regulation will be obtained at the point where
the return pin of R2 is connected to the ground pin of the
device directly.
(SOP-8 & TO-263-5)
VIN
Enable
C3
0.1uF
RT9183
VIN VOUT
EN
C1
10 uF
GND ADJ
RT
VOUT
R1
C2
10uF
R2
Figure 4. Return Pin of External Resistor Connection
Referring to Figure 3 the fixed voltage versions for both
SOP-8 and TO-263-5 packages, the ADJ pin is the input
to the error amplifier and MUST be tied the ground pin of
the device directly otherwise it will be in the unstable state
if the pin voltage more than 0.1V with respect to the ground
pin itself.
DS9183-02 December 2003
www.richtek.com
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT9183.PDF ] | |
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