RT9166-23P [ETC]
300/600mA, Ultra-Fast Transient Response LDO Regulator; 300 / 600毫安，超快速瞬态响应LDO稳压器
| 型号： | RT9166-23P |
| 厂家： | 
ETC |
| 描述： | 300/600mA, Ultra-Fast Transient Response LDO Regulator |
| 文件： | 总14页 (文件大小：198K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Preliminary
RT9166/A
300/600mA, Ultra-Fast Transient Response LDO Regulator
General Description
Features
z Low Quiescent Current (Typically 220µA)
z Guaranteed 300/600mA Output Current
z Low Dropout Voltage: 230/580mV at 300/600mA
z Wide Operating Voltage Ranges: 3V to 5.5V
z Ultra-Fast Transient Response
z Tight Load and Line Regulation
z Current Limiting Protection
The RT9166/A series are CMOS low dropout regulators
optimized for ultra-fast transient response. The devices are
capable of supplying 300mA or 600mA of output current
with a dropout voltage of 230mV or 580mV respectively.
The RT9166/A series are is optimized for CD/DVD-ROM,
CD/RW or wireless communication supply applications.
The RT9166/Aregulators are stable with output capacitors
as low as 1µF. The other features include ultra low dropout
voltage, high output accuracy, current limiting protection,
and high ripple rejection ratio.
z Thermal Shutdown Protection
z Only low-ESR Ceramic Capacitor Required for
Stability
z Custom Voltage Available
The devices are available in fixed output voltages range of
1.2V to 4.5V with 0.1V per step. The RT9166/A regulators
are available in 3-lead SOT-23, SOT-89, SOT-223 and TO-92
packages.
Applications
z CD/DVD-ROM, CD/RW
z Wireless LAN Card/Keyboard/Mouse
z Battery-Powered Equipment
z XDSL Router
Ordering Information
z PCMCIA Card
RT9166/A -
Pin Configurations
Package Type
VL : SOT-23 (L-Type)
X : SOT-89
(TOP VIEW)
VIN
XL : SOT-89 (L-Type)
G : SOT-223
GL : SOT-223 (L-Type)
Z : TO-92
3
VOUT
GND
VIN
3
2
1
1
2
TO-92
GND
VOUT
(RT9166/A)
SOT-23 (L-Type)
(RT9166)
Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard
Output Voltage
12 : 1.2V
13 : 1.3V
:
1
2
3
1
2
3
GND
VOUT
VIN
(TAB)
GND VIN
(TAB)
VOUT
45 : 4.5V
SOT-89 (L-Type)
SOT-89
600mA Output Current
300mA Output Current
Marking Information
1
2
3
1
3
2
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
VOUT
GND
VIN
(TAB)
VOUT GND
(TAB)
VIN
SOT-223 (L-Type)
SOT-223
DS9166/A-09 October 2004
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1
Preliminary
RT9166/A
Typical Application Circuit
RT9166/A
V
VIN
VOUT
GND
V
IN
OUT
C
C
OUT
IN
1uF
1uF
Note: To prevent oscillation, a 1µF minimum X7R or X5R dielectric is strongly recommended if ceramics are
used as input/output capacitors. When using the Y5V dielectric, the minimum value of the input/output
capacitance that can be used for stable over full operating temperature range is 3.3µF. (see Application
Information Section for further details)
Functional Pin Description
Pin Name
Pin Function
VIN
Supply Input
VOUT
GND
Regulator Output
Common Ground
Function Block Diagram
VIN
VOUT
Error
Amplifier
Current
Limiting
Sensor
-
Thermal
Shutdown
1.2V
Reference
GND
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DS9166/A-09 October 2004
Preliminary
Absolute Maximum Ratings (Note 1)
RT9166/A
z Supply Input Voltage-------------------------------------------------------------------------------------------------- 6.5V
z Power Dissipation, PD @ T = 25°C
A
SOT-23 ------------------------------------------------------------------------------------------------------------------- 0.4W
SOT-89 ------------------------------------------------------------------------------------------------------------------- 0.571W
SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.740W
z Package Thermal Resistance (Note 7)
SOT-23, θJA ------------------------------------------------------------------------------------------------------------- 250°C/W
SOT-89, θJA ------------------------------------------------------------------------------------------------------------- 175°C/W
SOT-223, θJA ------------------------------------------------------------------------------------------------------------ 135°C/W
z Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
z Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- –65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 3)
z Supply Input Voltage-------------------------------------------------------------------------------------------------- 2.8V to 5.5V
z Junction Temperature Range---------------------------------------------------------------------------------------- –40°C to 125°C
Electrical Characteristics
(VIN = VOUT + 1V or VIN = 2.8V whichever is greater, CIN = 1µF, COUT = 1µF, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
IOUT = 1mA
Min
Typ
Max Units
Output Voltage Accuracy
--
--
+3
--
%
∆VOUT
−1
300
600
--
RT9166
ILIM
IQ
mA
R
LOAD = 1Ω
Current Limit
RT9166A
--
--
Quiescent Current
Dropout Voltage
(Note 4)
(Note 6)
IOUT = 0mA
220
300
µA
RT9166
IOUT = 300mA
--
--
230
580
--
--
VDROP
mV
RT9166A
I
OUT = 600mA
VIN = (VOUT + 0.3V) to 5.5V,
OUT = 1mA
Line Regulation
--
0.2
--
%/V
mV
∆VLINE
I
1mA < IOUT < 300mA
1mA < IOUT < 600mA
f = 1kHz, COUT = 1µF
Load Regulation
(Note 5)
RT9166
--
--
15
30
35
55
--
∆VLOAD
RT9166A
dB
°C
°C
Power Supply Rejection Rate
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
PSRR
TSD
--
--
--
−55
170
40
--
--
∆TSD
DS9166/A-09 October 2004
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3
Preliminary
RT9166/A
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. 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 remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4.The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
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 1mA to 300mA and 600mA respectively.
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. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
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DS9166/A-09 October 2004
Preliminary
Typical Operating Characteristics
RT9166/A
Power Supply Rejection Ratio
Dropout Voltage vs. Load Current
700
600
500
400
300
200
100
0
0
-10
-20
-30
-40
-50
-60
CIN = 1uF
COUT = 1uF
VIN = 5V
CIN = 1uF
COUT = 1uF
TJ = 125°C
TJ = 25°C
100mA
TJ = −40°C
1mA
10
100
1k
10k
100k
1M
0
100
200
300
400
500
600
Frequency (Hz)
Load Current (mA)
Output Noise
Region of Stable COUT ESR vs. Load Current
100.00
I
LOAD = 100mA
COUT = 1uF
VIN = 5V
CIN = 1uF
COUT = 1uF to 4.7uF
10.00
1.00
0.10
0.01
0.00
400
Instable
200
0
Stable
-200
-400
Instable
f = 10Hz to 100KHz
Time (1ms/DIV)
0
100
200
300
400
500
600
Load Current (mA)
Current Limit vs. Input voltage
Current Limit vs. Input voltage
900
850
800
750
700
900
850
800
750
700
VIN = 5V
CIN = 1uF
VIN = 5V
CIN = 1uF
COUT = 1uF
RL = 0.5Ω
COUT = 1uF
RL = 0.5Ω
RT9166-33CX
5.5
RT9166-33CVL
3
3.5
4
4.5
5
3
3.5
4
4.5
5
5.5
Input voltage (V)
Input voltage (V)
DS9166/A-09 October 2004
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5
Preliminary
RT9166/A
Current Limit vs. Temperature
Current Limit vs. Temperature
900
850
800
750
700
900
850
800
750
700
VIN = 5V
VIN = 5V
CIN = 1uF
CIN = 1uF
COUT = 1uF
RL = 0.5Ω
COUT = 1uF
RL = 0.5Ω
RT9166-33CX
75 100 125
RT9166-33CVL
75 100 125
-40
-25
0
25
50
-40
-25
0
25
50
(°C)
Temperature
(°C)
Temperature
Quiescent Current vs. Temperature
Quiescent Current vs. Temperature
260
240
220
200
180
160
140
260
240
220
200
180
160
140
VIN = 5V
CIN = 1uF
VIN = 5V
CIN = 1uF
COUT = 1uF
COUT = 1uF
RT9166-33CX
75 100 125
RT9166-33CVL
75 100 125
-40
-40
-25
0
25
50
-25
0
25
50
(°C)
(°C)
Temperature
Temperature
Temperature Stability
Temperature Stability
3.4
3.35
3.3
3.4
3.35
3.3
3.25
3.2
3.25
VIN = 5V
CIN = 1uF
COUT = 1uF
VIN = 5V
CIN = 1uF
COUT = 1uF
RT9166-33CX
75 100 125
RT9166-33CVL
75 100 125
3.2
-40
-25
0
25
50
-40
-25
0
25
50
Temperature
Temperature
(°C)
(°C)
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DS9166/A-09 October 2004
Preliminary
RT9166/A
Load Transient Response
Load Transient Response
VIN = 5V, ILOAD = 1 to 150mA
VIN = 5V, ILOAD = 1 to 150mA
CIN = COUT = 1uF (Ceramic, X7R)
CIN = COUT = 1uF (Ceramic, X7R)
200
100
0
200
100
0
20
0
20
0
-20
-20
RT9166-33CX
RT9166-33CVL
Time (100us/Div)
Time (100us/Div)
Line Transient Response
VIN = 4 to 5V
CIN = 1uF
COUT = 1uF
5
4
20
0
-20
Time (100us/Div)
DS9166/A-09 October 2004
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7
Preliminary
RT9166/A
Application Information
No Load Stability
Like any low-dropout regulator, the RT9166/A series
requires input and output decoupling capacitors. These
capacitors must be correctly selected for good
performance (see Capacitor Characteristics Section).
Please note that linear regulators with a low dropout
voltage have high internal loop gains which require care
in guarding against oscillation caused by insufficient
decoupling capacitance.
The device will remain stable and in regulation with no
external load. This is specially important in CMOS RAM
keep-alive applications.
Input-Output (Dropout) Voltage
A regulator's minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Because the device uses
a PMOS, its dropout voltage is a function of drain-to-
source on-resistance, RDS(ON), multiplied by the load
current:
Input Capacitor
An input capacitance of ≅ 1µF is required between the
device input pin and ground directly (the amount of the
capacitance may be increased without limit). The input
capacitor MUST be located less than 1 cm from the device
to assure input stability (see PCB Layout Section).Alower
ESR capacitor allows the use of less capacitance, while
higher ESR type (like aluminum electrolytic) require more
capacitance.
VDROPOUT = VIN - VOUT = RDS(ON) x IOUT
Current Limit
The RT9166/A monitors and controls the PMOS' gate
voltage, minimum limiting the output current to 300mA for
RT9166 and 600mA for RT9166A. The output can be
shorted to ground for an indefinite period of time without
damaging the part.
Capacitor types (aluminum, ceramic and tantalum) can
be mixed in parallel, but the total equivalent input
capacitance/ESR must be defined as above to stable
operation.
Short-Circuit Protection
There are no requirements for the ESR on the input
capacitor, but tolerance and temperature coefficient must
be considered when selecting the capacitor to ensure the
capacitance will be ≅ 1µF over the entire operating
temperature range.
The device is short circuit protected and in the event of a
peak over-current condition, the short-circuit control loop
will rapidly drive the output PMOS pass element off. Once
the power pass element shuts down, the control loop will
rapidly cycle the output on and off until the average power
dissipation causes the thermal shutdown circuit to
respond to servo the on/off cycling to a lower frequency.
Please refer to the section on thermal information for
power dissipation calculations.
Output Capacitor
The RT9166/A is designed specifically to work with very
small ceramic output capacitors. The recommended
minimum capacitance (temperature characteristics X7R
or X5R) is 1µF to 4.7µF range with 10mΩ to 50mΩ range
ceramic capacitor between LDO output and GND for
transient stability, but it may be increased without limit.
Higher capacitance values help to improve transient. The
output capacitor's ESR is critical because it forms a zero
to provide phase lead which is required for loop stability.
(When using the Y5V dielectric, the minimum value of
the input/output capacitance that can be used for stable
over full operating temperature range is 3.3µF.)
Capacitor Characteristics
It is important to note that capacitance tolerance and
variation with temperature must be taken into
consideration when selecting a capacitor so that the
minimum required amount of capacitance is provided over
the full operating temperature range. In general, a good
tantalum capacitor will show very little capacitance
variation with temperature, but a ceramic may not be as
good (depending on dielectric type).
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DS9166/A-09 October 2004
Preliminary
RT9166/A
Aluminum electrolytics also typically have large
temperature variation of capacitance value.
Tantalums also have good temperature stability: a good
quality tantalum will typically show a capacitance value
that varies less than 10~15% across the full temperature
range of 125°C to -40°C. ESR will vary only about 2X
going from the high to low temperature limits.
Equally important to consider is a capacitor's ESR change
with temperature: this is not an issue with ceramics, as
their ESR is extremely low. However, it is very important
in Tantalum and aluminum electrolytic capacitors. Both
show increasing ESR at colder temperatures, but the
increase in aluminum electrolytic capacitors is so severe
they may not be feasible for some applications.
The increasing ESR at lower temperatures can cause
oscillations when marginal quality capacitors are used (if
the ESR of the capacitor is near the upper limit of the
stability range at room temperature).
Ceramic:
Aluminum:
For values of capacitance in the 10µF to 100µF range,
ceramics are usually larger and more costly than
tantalums but give superior AC performance for by-
passing high frequency noise because of very low ESR
(typically less than 10mΩ). However, some dielectric types
do not have good capacitance characteristics as a function
of voltage and temperature.
This capacitor type offers the most capacitance for the
money. The disadvantages are that they are larger in
physical size, not widely available in surface mount, and
have poor AC performance (especially at higher
frequencies) due to higher ESR and ESL.
Compared by size, the ESR of an aluminum electrolytic
is higher than either Tantalum or ceramic, and it also varies
greatly with temperature. A typical aluminum electrolytic
can exhibit an ESR increase of as much as 50X when
going from 25°C down to -40°C.
Z5U and Y5V dielectric ceramics have capacitance that
drops severely with applied voltage. Atypical Z5U or Y5V
capacitor can lose 60% of its rated capacitance with half
of the rated voltage applied to it. The Z5U and Y5V also
exhibit a severe temperature effect, losing more than 50%
of nominal capacitance at high and low limits of the
temperature range.
It should also be noted that many aluminum electrolytics
only specify impedance at a frequency of 120Hz, which
indicates they have poor high frequency performance.
Only aluminum electrolytics that have an impedance
specified at a higher frequency (between 20kHz and
100kHz) should be used for the device. Derating must be
applied to the manufacturer's ESR specification, since it
is typically only valid at room temperature.
X7R and X5R dielectric ceramic capacitors are strongly
recommended if ceramics are used, as they typically
maintain a capacitance range within 20% of nominal over
full operating ratings of temperature and voltage. Of
course, they are typically larger and more costly than
Z5U/Y5U types for a given voltage and capacitance.
Any applications using aluminum electrolytics should be
thoroughly tested at the lowest ambient operating
temperature where ESR is maximum.
Tantalum:
Solid tantalum capacitors are recommended for use on
the output because their typical ESR is very close to the
ideal value required for loop compensation. They also
work well as input capacitors if selected to meet the ESR
requirements previously listed.
DS9166/A-09 October 2004
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9
Preliminary
RT9166/A
Thermal Considerations
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.
The RT9166/A series can deliver a current of up to 300/
600mAover the full operating junction temp-erature range.
However, the maximum output current must be derated
at higher ambient temperature to ensure the junction
temperature does not exceed 125°C. With all possible
conditions, the junction temperature must be within the
range specified under operating conditions. Power
dissipation can be calculated based on the output current
and the voltage drop across regulator.
PD = (VIN - VOUT) IOUT + VIN IGND
Optimum performance can only be achieved when the
device is mounted on a PC board according to the diagram
below:
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 SOT-23 package at recomm-ended minimum
footprint is 250°C/W, 175°C/W for SOT-89 package and
135°C/W for SOT-223 package (θJA is layout dependent).
Visit our website in which “Recommended Footprints for
Soldering Surface Mount Packages” for detail.
V
IN
GND
V
OUT
PCB Layout
SOT-23 Board 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”.
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DS9166/A-09 October 2004
Preliminary
RT9166/A
Outline Dimension
H
D
L
C
B
e
b
A
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
1.803
0.080
0.300
1.295
0.152
1.803
0.508
2.997
3.099
2.007
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.071
0.003
0.012
0.051
0.006
0.071
0.020
0.118
0.122
0.079
0.010
0.024
b
C
D
e
H
L
SOT-23 Surface Mount Package
DS9166/A-09 October 2004
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11
Preliminary
RT9166/A
D
D1
A
B
C
C1
e
e
H
A
b
b
b1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
1.397
0.356
2.388
0.406
--
Max
Min
0.055
0.014
0.094
0.016
--
Max
A
b
1.600
0.483
2.591
0.533
4.242
1.194
4.597
1.753
1.549
0.432
0.063
0.019
0.102
0.021
0.167
0.047
0.181
0.069
0.061
0.017
B
b1
C
C1
D
0.787
4.394
1.397
1.448
0.355
0.031
0.173
0.055
0.057
0.014
D1
e
H
3-Lead SOT-89 Surface Mount Package
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DS9166/A-09 October 2004
Preliminary
RT9166/A
D
D1
H
C
B
L
L1
e
e
A
A1
b
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
0.071
0.0047
0.031
0.146
0.287
0.264
0.124
0.093
0.013
0.077
0.013
A
A1
b
1.450
0.020
0.610
3.302
6.706
6.299
2.896
2.261
0.229
1.550
0.800
1.803
0.100
0.787
3.708
7.290
6.706
3.150
2.362
0.330
1.950
1.100
0.057
0.0008
0.024
0.130
0.264
0.248
0.114
0.089
0.009
0.061
0.009
B
C
D
D1
e
H
L
L1
3-Lead SOT-223 Surface Mount Package
DS9166/A-09 October 2004
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13
Preliminary
RT9166/A
A
D
E
L
b
C
e
D1
A1
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
3.175
1.143
0.406
0.406
4.445
3.429
4.318
1.143
12.700
Max
4.191
1.372
0.533
0.533
5.207
--
Min
Max
0.165
0.054
0.021
0.021
0.205
--
0.125
0.045
0.016
0.016
0.175
0.135
0.170
0.045
0.500
A
A1
b
C
D
D1
E
0.210
0.055
--
5.334
1.397
--
e
L
3-Lead TO-92 Plastic Package
RICHTEK TECHNOLOGY CORP.
RICHTEK TECHNOLOGY CORP.
Headquarter
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
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14
DS9166/A-09 October 2004
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