RT9001-12GG [RICHTEK]
600mA, Ultra-Fast Transient Response LDO Regulator; 600毫安，超快速瞬态响应LDO稳压器
| 型号： | RT9001-12GG |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | 600mA, Ultra-Fast Transient Response LDO Regulator |
| 文件： | 总9页 (文件大小：158K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9001
600mA, Ultra-Fast Transient Response LDO Regulator
General Description
Features
z Low Quiescent Current (Typically 220μA)
z Guaranteed 600mA Output Current
z Low Dropout Voltage : 580mV at 600mA
z Wide Operating Voltage Ranges : 3V to 5.5V
z Ultra-Fast Transient Response
The RT9001 series are CMOS low dropout regulators
optimized for ultra-fast transient response. The devices are
capable of supplying 600mAof output current with a dropout
voltage of 580mV respectively.
The RT9001 series are is optimized for CD/DVD-ROM,
CD/RW or wireless communication supply applications.
The RT9001 regulators 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 Tight Load and Line Regulation
z Current Limiting Protection
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 RT9001 regulators
are available in 3-lead SOT-223 package.
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z CD/DVD-ROM, CD/RW
z Wireless LAN Card/Keyboard/Mouse
z Battery-Powered Equipment
z XDSL Router
Ordering Information
RT9001-
Package Type
G : SOT-223
z PCMCIA Card
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Pin Configurations
(TOP VIEW)
Output Voltage
12 : 1.2V
13 : 1.3V
:
45 : 4.5V
1
3
2
Note :
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
GND VOUT VIN
(TAB)
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
SOT-223
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
DS9001-04 March 2007
www.richtek.com
1
RT9001
Typical Application Circuit
RT9001
VOUT
GND
VIN
V
V
OUT
IN
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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DS9001-04 March 2007
RT9001
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage-------------------------------------------------------------------------------------------------- 6.5V
z Power Dissipation, PD @ T = 25°C
A
SOT-223 ----------------------------------------------------------------------------------------------------------------- 0.625W
z Package Thermal Resistance (Note 7)
SOT-223, θJA ------------------------------------------------------------------------------------------------------------ 160°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
Output Voltage Accuracy
Current Limit
Symbol
Test Conditions
= 1mA
OUT
Min
−1
600
--
Typ
--
Max Units
ΔV
I
+3
--
%
OUT
I
R
I
= 1Ω
LOAD
--
mA
μA
LIM
Quiescent Current (Note 6)
Dropout Voltage (Note 4)
I
= 0mA
220
580
300
--
Q
OUT
V
I
= 600mA
--
mV
DROP
OUT
V
= (V
= 1mA
+ 0.3V) to 5.5V,
IN
OUT
Line Regulation
ΔV
ΔV
--
0.2
--
%/V
LINE
I
OUT
Load Regulation (Note 5)
1mA < I < 600mA
f = 1kHz, C = 1μF
OUT
--
--
--
--
30
−55
170
40
55
--
mV
dB
°C
LOAD
OUT
Power Supply Rejection Rate
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
PSRR
T
--
SD
ΔT
--
°C
SD
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 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.
DS9001-04 March 2007
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RT9001
Typical Operating Characteristics
Output Voltage vs. Temperature
Quiescent Current vs. Temperature
3.5
250
230
210
190
170
150
3.45
3.4
3.35
3.3
3.25
3.2
3.15
3.1
VIN = 5V
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature
(°C)
(°C)
Temperature
Dropout Voltage vs. Load Current
Power Supply Rejection Ratio
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)
Current Limit vs. Input voltage
Current Limit vs. Temperature
900
850
800
750
700
900
850
800
750
700
VIN = 5V
CIN = 1uF
COUT = 1uF
RL = 0.5Ω
VIN = 5V
CIN = 1uF
COUT = 1uF
RL = 0.5Ω
3
3.5
4
4.5
5
5.5
-40
-25
0
25
50
75
100
125
(°C)
Input voltage (V)
Temperature
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DS9001-04 March 2007
RT9001
Region of Stable COUT ESR vs. Load Current
100.00
Output Noise
COUT = 1uF to 4.7uF
I
LOAD = 100mA
COUT = 1uF
VIN = 5V
CIN = 1uF
10.00
1.00
0.10
0.01
0.00
Instable
400
200
0
Stable
-200
-400
Instable
f = 10Hz to 100kHz
0
100
200
300
400
500
600
Time (1ms/DIV)
Load Current (mA)
Load Transient Response
Line Transient Response
VIN = 5V, ILOAD = 1 to 150mA
CIN = COUT = 1uF (Ceramic, X7R)
VIN = 4 to 5V
CIN = 1uF
200
COUT = 1uF
5
4
100
0
20
0
20
0
-20
-20
Time (100us/Div)
Time (100us/Div)
DS9001-04 March 2007
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RT9001
Application Information
Input-Output (Dropout) Voltage
Like any low-dropout regulator, the RT9001 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.
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 :
VDROPOUT = VIN - VOUT = RDS(ON) x IOUT
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. A lower ESR capacitor allows the
use of less capacitance, while higher ESR type (like
aluminum electrolytic) require more capacitance.
Current Limit
The RT9001 monitors output current and controls the
PMOS' gate voltage to limit the output current to 600mA
(MIN). The output can be shorted to ground for an indefinite
period of time without damaging the part.
Short-Circuit Protection
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.
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.
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.
Output Capacitor
Capacitor Characteristics
The RT9001 is designed specifically to work with very small
ceramic output capacitors. The recommended minimum
capacitance (temperature characteristics X7R or X5R) is
from 1μF to 4.7μF 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.)
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).
No Load Stability
The device will remain stable and in regulation with no
external load. This is specially important in CMOS RAM
keep-alive applications.
No Load Stability
The device will remain stable and in regulation with no
external load. This is specially important in CMOS RAM
keep-alive applications.
Aluminum electrolytics also typically have large
temperature variation of capacitance value.
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DS9001-04 March 2007
RT9001
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).
Aluminum:
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.
Ceramic:
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.
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.
Thermal Considerations
Thermal protection limits power dissipation in RT9901.
When the operation junction temperature exceeds 170°C,
the OTP circuit starts the thermal shutdown function and
turns the pass element off. The pass element turns on
again after the junction temperature cools by 40°C. For
continuous loading operation, do not exceed absolute
maximum operation junction temperature 125°C. The
power dissipation definition in device is:
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.
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.
PD = (VIN - VOUT) IOUT + VIN IGND
The final operating junction temperature for any set of
conditions can be estimated by the following thermal
equation :
PD (MAX) = ( TJ (MAX) - TA ) / θJA
DS9001-04 March 2007
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7
RT9001
Where TJ(MAX) is the maximum junction temperature of the
die (125°C) and TA is the ambient temperature. The junction
to ambient thermal resistance (θJA)for SOT-223 package
at recommended minimum footprint is 160°C/W (θJA is
layout dependent). Visit our website in which
“Recommended Footprints for Soldering Surface Mount
Packages” for detail.
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DS9001-04 March 2007
RT9001
Outline Dimension
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
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F, 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
DS9001-04 March 2007
www.richtek.com
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