RT9002A_11 [RICHTEK]
Dual Low Dropout Regulator with Detector; 双路低压差稳压器与检测器
| 型号： | RT9002A_11 |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | Dual Low Dropout Regulator with Detector |
| 文件： | 总11页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9002A/B/C
Dual Low Dropout Regulator with Detector
General Description
Features
z Low Quiescent Current (Typically 70μA)
z Wide Operating Voltage Ranges : 2.5V to 5.5V
z Ultra-Fast Transient Response
The RT9002A/B/C is a dual-channel, low noise, and low
dropout regulator. The first regulator is capable of sourcing
240mA, while the second regulator can source up to
500mA and includes a voltage detection function. The
RT9002A/B/C performance is optimized for CD/DVD-ROM,
CD/RW or wireless communication supply applications.
The RT9002A/B/C regulator is stable with output capacitors
as low as 1μF. The other features include high output
accuracy, ultra-fast transient response, tight load and line
regulation, current limiting/thermal protection and high
ripple rejection ratio. The RT9002A/B/C is available in
SOP-8 package requiring minimum board space and
smallest components.
z Tight Load and Line Regulation
z Current Limiting Protection
z Thermal Shutdown Protection
z Only Low ESR Ceramic Capacitors Required for
Stability
z Custom LDO VOUT1, VOUT2 Voltage Available from
1.5V to 3.3V
z Custom VIN Detector Available from 3.5V to 4V
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
Ordering Information
z CD/DVD-ROM, CD/RW
z Wireless LAN Card/Keyboard/Mouse
z Battery-Powered Equipment
z XDSL Router
-
RT9002A/B/C
Package Type
S : SOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free) Pin Configurations
Output Voltage : VOUT1/VOUT2
A : 2.5V/3.3V
(TOP VIEW)
B : 1.5V/2.8V
VIN1
VOUT1
Cd
8
EN1
C : 2.5V/3.3V
Note :
2
3
4
7
6
5
GND
VDOUT
VOUT2
Richtek products are :
VIN2
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
SOP-8
` Suitable for use in SnPb or Pb-free soldering processes.
Typical Application Circuit
2
3
1
V
VIN1
VOUT1
V
IN1
OUT1
C
1uF
C
1uF
IN1
OUT1
RT9002A/B/C
Cd
Cd
R1
100k
8
4
EN1
Chip Enable
V
V
IN2
6
5
VDOUT
VOUT2
DOUT
V
VIN2
V
IN2
OUT2
CIN2
1uF
C
1uF
GND
7
OUT2
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RT9002A/B/C
Functional Pin Description
Pin No. Pin Name
Pin Function
1
2
3
4
5
6
7
8
VIN1
Channel 1 Supply Input.
Channel 1 Output Voltage.
Delay Capacitor.
VOUT1
Cd
VIN2
Channel 2 Supply Voltage.
Channel 2 Output Input.
VOUT2
VDOUT
GND
Detector Output Voltage. (RT9002A = Active High, RT9002B and RT9002C = Active Low)
Common Ground.
EN1
Chip Enable (Active High) for Channel 1.
Function Block Diagram
EN1
Shutdown
and
VIN1
Logic Control
V
REF
+
MOS Driver
Error
VOUT1
Amplifier
Current-Limit
and
Thermal
Protection
VIN2
+
MOS Driver
Error
Amplifier
Cd
VOUT2
Current-Limit
and
Thermal
Protection
V
REF
VDOUT
-
+
GND
VD
Comparator
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RT9002A/B/C
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ------------------------------------------------------------------------------------------------ 6V
z Package Thermal Resistance (Note 2)
SOP-8, θJA ------------------------------------------------------------------------------------------------------------ 110°C/W
z PowerDissipation, PD @ TA = 25°C
SOP-8 ------------------------------------------------------------------------------------------------------------------ 0.909W
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
z Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
z StorageTemperature Range --------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z Supply Input Voltage ------------------------------------------------------------------------------------------------ 2.5V to 5.5V
z Chip Enable Input Voltage ----------------------------------------------------------------------------------------- 0V to 5.5V
z Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
Electrical Characteristics
(VIN = VOUT + 1V, whichever is greater, CIN = 1μF, COUT = 1μF, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Regulator 1
RT9002A
RT9002B
RT9002C
2.45
1.47
2.45
240
2.5
1.5
2.5
--
2.55
1.53
2.55
--
Output Voltage
Accuracy
ΔV
I
= 30mA
V
OUT1
OUT1
Maximum Output Current
I
mA
mV
OUT1_MAX
Load Regulation
(Note 5)
ΔV
1mA < I
< 100mA
--
--
--
1
--
--
--
LOAD1
OUT1
V
I
I
= 30mA
50
DROP1_1
OUT1
Dropout Voltage
(Note 6)
(Note 7)
mV
V
= 100mA
150
DROP1_2
OUT1
V
= V
= 3.5V,
EN1
IN1
Quiescent Current
Standby Current
Line Regulation
I
Q1
--
--
--
30
0.1
--
1
μA
μA
I
= 0mA
OUT1
I
V
= 3.5V, V
= 0V
EN1
STB1
IN1
V
V
= 3.5V to 5.5V,
IN1
ΔV
0.01
0.2
%/V
LINE1
= V
, I
= 30mA
IN1
EN1 OUT1
Power Supply Rejection Rate
Current Limit
PSRR1
f = 100Hz, I
= 100mA
--
--
−60
450
--
--
--
dB
OUT1
I
V
IN1
= V = 5V
EN1
mA
LIM1
Logic-Low
Logic-High
V
IL
--
0.6
--
EN Threshold Voltage
V
V
IH
1.8
--
--
Thermal Shutdown Protection
DS9002ABC-04 April 2011
T
SD1
170
--
°C
To be continued
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3
RT9002A/B/C
Parameter
Thermal Shutdown Hysteresis
Enable Pin Current
Symbol
ΔTSD1
IEN
Test Conditions
Min
--
Typ
40
Max
--
Unit
°C
VIN = 3.5V, Enable
--
0.1
1
μA
Regulator 2
RT9002A
3.234
2.744
3.234
500
--
3.3
2.8
3.3
--
3.366
2.856
3.366
--
Output Voltage
Accuracy
ΔVOUT2
IOUT2 = 30mA
V
RT9002B
RT9002C
Maximum Output Current
IOUT2_MAX
mA
mV
Load Regulation
Dropout Voltage
Quiescent Current
Line Regulation
(Note 5)
(Note 6)
(Note 7)
ΔVLOAD2 1mA < IOUT2 < 100mA
VDROP2_1 IOUT2 = 30mA
15
50
--
50
90
mV
μA
VDROP2_2 IOUT2 = 100mA
--
150
40
200
--
IQ2
VIN2 = 4.3V, IOUT2 = 0mA
IN2 = 4.3V to 5.5V,
OUT2 = 30mA
--
V
ΔVLINE2
--
0.01
0.2
%/V
I
Power Supply Rejection Rate
Current Limit
PSRR2
ILIM2
f = 100Hz, IOUT2 = 100mA
VIN2 = 5V
--
--
--
--
−60
800
170
40
--
--
--
--
dB
mA
°C
Thermal Shutdown Protection
Thermal Shutdown Hysteresis
Detector
TSD2
°C
ΔTSD2
RT9002A
RT9002B VDF
3.528
3.822
3.528
VDF
3.6
3.9
3.6
VDF
3.672
3.978
3.672
VDF
Detect Fall Voltage
Hysteresis
V
V
RT9002C
ΔVHYS
x0.02 x0.05 x0.08
RT9002A
VDOUT = 0.5V, VIN2 = 5.0V
VDOUT = 0.5V, VIN2 = 2.0V
7
4
4
12
8
--
--
--
Sink Current
RT9002B IDOUT
RT9002C
mA
8
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DS9002ABC-04 April 2011
RT9002A/B/C
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. θJA is measured in the natural convection at TA = 25°C on a high effective thermal conductivity test board of JEDEC
51-7 2S2P 4-layer thermal measurement standard.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
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 100mA.
Note 6. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
Note 7. 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.
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RT9002A/B/C
Typical Operating Characteristics
Input Voltage vs. Detector Voltage
Input Voltage vs. Detector Voltage
7
7
6
5
4
3
2
1
0
RT9002B
RT9002A
6
5
4
3
2
1
0
0
1
2
3
4
5
6
125
0
1
2
3
4
5
Input Voltage (V)
Input Voltage (V)
Output Voltage vs. Temperature
Output Voltage vs. Temperature
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
3.0
RT9002A
RT9002B
VOUT2
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
VOUT2
VOUT1
VOUT1
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Quiescent Current vs. Input Voltage
Quiescent Current vs. Input Voltage
45
42.5
40
45
RT9002B
RT9002A
42.5
40
VOUT2
VOUT2
37.5
35
37.5
35
VOUT1
32.5
30
32.5
30
VOUT1
27.5
25
27.5
25
2.5
3
3.5
4
4.5
5
5.5
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
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RT9002A/B/C
Nch Driver Sink Current vs. Input Voltage
Nch Driver Sink Current vs. Input Voltage
60
50
40
30
20
10
0
60
50
40
30
20
10
0
RT9002B
RT9002A
-40°C
-40°C
25°C
125°C
25°C
125°C
0
1
2
3
4
5
6
0
1
2
3
4
5
6
Input Voltage (V)
Input Voltage (V)
Nch Driver Sink Current vs. VDS
Nch Driver Sink Current vs. VDS
110
100
90
80
70
60
50
40
30
20
10
0
200
175
150
125
100
75
RT9002B
RT9002A
VDD = 3.5V
VDD = 5V
VDD = 5.5V
VDD = 4.5V
VDD = 3V
VDD = 2.5V
VDD = 2V
50
VDD = 1.5V
VDD = 1V
25
VDD = 0.5V
4
0
0
1
2
3
5
6
0
1
2
3
4
5
6
VDS (V)
VDS (V)
Output Delay Time vs. Load Capacitance
Output Delay Time vs. Load Capacitance
1000
100
10
1000
100
10
RT9002A
RT9002B
1
1
0.1
0.1
0.01
0.01
0.0000
0.0001
0.0010
0.0100
0.1000
0.0000
0.0001
0.0010
0.0100
0.1000
Load Capacitance (uF)
Load Capacitance (uF)
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RT9002A/B/C
Dropout Voltage vs. Load Current
Dropout Voltage vs. Load Current
400
350
300
250
200
150
100
50
600
500
400
300
200
100
0
RT9002A, VOUT1 = 2.5V
RT9002C, VOUT2 = 3.3V
125°C
25°C
125°C
25°C
-40°C
-40°C
0
0
50
100
150
200
250
300
0
0.1
0.2
0.3
0.4
0.5
Load Current (A)
Load Current (mA)
EN Pin Shutdown Response
Line Transient Response
RT9002A
Boost ILOAD = 50mA
RT9002A, VOUT1
ILOAD = 75mA
5
VOUT
(1V/Div)
4
VOUT1
(20mV/Div)
VOUT2
(20mV/Div)
Time (100μs/Div)
Time (250μs/Div)
Load Transient Response
Start Up
RT9002A
ILOAD = 10mA to 100mA
RT9002A, VOUT1
ILOAD = 75mA
IOUT1
(100mA/Div)
VOUT1
(5mV/Div)
VOUT2
(50mV/Div)
Time (500μs/Div)
Time (10μs/Div)
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DS9002ABC-04 April 2011
RT9002A/B/C
Noise
Noise
RT9002B, VOUT1
IOUT1 = 100mA
RT9002B, VOUT1
No Load
600
400
200
0
600
400
200
0
-200
-400
-600
-200
-400
-600
Time (10ms/Div)
Time (10ms/Div)
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RT9002A/B/C
Applications Information
Like any low-dropout regulator, the external capacitors used
with the RT9002A/B/C must be carefully selected for
regulator stability and performance. Using a capacitor
whose value is > 1μF on the RT9002A/B/C input and the
amount of capacitance can be increased without limit. The
input capacitor must be located a distance of not more
than 0.5 inch from the input pin of the IC and returned to a
clean analog ground. Any good quality ceramic can be
used for this capacitor. The capacitor with larger value and
lower ESR (equivalent series resistance) provides better
PSRR and line-transient response.
Enable
The RT9002A/B/C goes into sleep mode when the Enable
pin is in a logic low condition. During this condition, the
pass transistor, error amplifier, and bandgap are turned off,
reducing the supply current to 0.1μA typical. The Enable
pin may be directly tied to VIN to keep the part on. The
Enable input is CMOS logic and cannot be left floating.
PSRR
The power supply rejection ratio (PSRR) is defined as the
gain from the input to output divided by the gain from the
supply to the output. The PSRR is found to be
The output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDOs
application. The RT9002A/B/C is designed specifically to
work with low ESR ceramic output capacitor in space-
saving and performance consideration. Using a ceramic
capacitor whose value is at least 1μF with ESR is > 20mΩ
on the RT9002A/B/C output ensures stability. The
RT9002A/B/C still works well with output capacitor of other
types due to the wide stable ESR range. Figure 1. shows
the curves of allowable ESR range as a function of load
current for various output capacitor values. Output capacitor
of larger capacitance can reduce noise and improve load
transient response, stability, and PSRR. The output
capacitor should be located not more than 0.5 inch from
the VOUT pin of the RT9002A/B/C and returned to a clean
analog ground.
⎛
⎜
⎞
⎟
Δ GainError
Δ Supply
PSRR = 20×log
⎝
⎠
Note that when heavy load measuring, Δsupply will cause
Δtemperature. And Δtemperature will cause Δoutput
voltage. So the heavy load PSRR measuring is include
temperature effect.
Current Limit
The RT9002A/B/C contains an independent current limiter,
which monitors and controls the pass transistor's gate
voltage, limiting the output1/2 current to 0.45/0.8A (typ.).
The output can be shorted to ground indefinitely without
damaging the part.
Thermal-Shutdown Protection
Thermal-shutdown protection limits total power dissipation
in the RT9002A/B/C. When the junction temperature
exceeds TJ = +170°C, the thermal sensor signals the
shutdown logic, turning off the pass transistor and allowing
the IC to cool. The thermal sensor turns the pass transistor
on again after the IC's junction temperature cools by 40°C,
resulting in a pulsed output during continuous thermal
overload conditions. Thermal-shutdown protection is
designed to protect the RT9002A/B/C in the event of fault
conditions. For continual operation, do not exceed the
absolute maximum junction temperature rating of TJ =
+125°C.
Region of Stable COUT ESR vs. Load Current
100
RT9002APS
VIN = 4.0V, VOUT2 = 3.3V
C
IN = COUT = 1uF/X7R
10
1
Unstable Region
Stable Region
0.1
0.01
0.001
Unstable Region (Simulation Verify)
0
50
100
150
200
250
300
Load Current (mA)
Figure 1
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DS9002ABC-04 April 2011
RT9002A/B/C
Outline Dimension
H
A
M
J
B
F
C
I
D
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
B
C
D
F
H
I
4.801
3.810
1.346
0.330
1.194
0.170
0.050
5.791
0.400
5.004
3.988
1.753
0.508
1.346
0.254
0.254
6.200
1.270
0.189
0.150
0.053
0.013
0.047
0.007
0.002
0.228
0.016
0.197
0.157
0.069
0.020
0.053
0.010
0.010
0.244
0.050
J
M
8-Lead SOP Plastic Package
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
5F, No. 95, Minchiuan Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)86672399 Fax: (8862)86672377
Email: marketing@richtek.com
Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit
design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be
guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.
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