RT9006A/B
Dual LDO Regulator with Reset Function
General Description
The RT9006A/B is an efficient, precise dual-channel CMOS
LDO regulator optimized for ultra-low-quiescent
applications. Regulators output1 and output2 are capable
of sourcing 300mA and 500mA of output current.
The RT9006’ s performance is optimized for CD/DVD-ROM
and CD/RW a supply applications.
The RT9006A/B regulators are stable with output capacitors
as low as 1μF, including current limit, thermal shutdown
protection, fast transient response, low dropout voltage,
high output accuracy, current limiting protection, and high
ripple rejection ratio. The RT9006A/B contains a reset
circuit to detect VOUT2 voltage.
The RT9006A/B regulators are available in used
SOP-8
(Exposed Pad) surface mount package.
Features
Low Quiescent Current (Typically 70μA)
μ
Wide Operating Voltage Ranges : 2.8V to 5.5V for
RT9006A
Wide Operating Voltage Ranges : 2.5V to 5.5V for
RT9006B
Ultra-Fast Transient Response
Tight Load and Line Regulation
Current Limiting Protection
Thermal Shutdown Protection
Only low-ESR Ceramic Capacitors Required for
Stability
RoHS Compliant and 100% Lead (Pb)-Free
Applications
CD/DVD-ROM, CD/RW
Wireless LAN Card/Keyboard/Mouse
Battery-Powered Equipment
XDSL Router
Ordering Information
RT9006A/B
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Operating Frequency Version
A : V
OUT1
= 1.8V, V
OUT2
= 3.3V
B : V
OUT1
= 1.5V, V
OUT2
= 3.3V
Note :
Richtek Pb-free and Green products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
Pin Configurations
(TOP VIEW)
VOUT1
VIN1
VIN2
VOUT2
2
3
4
8
7
GND
6
9
5
GND
GND
RST
CT
SOP-8 (Exposed Pad)
Typical Application Circuit
V
IN1
5V
VIN1
C1
1uF
R
RST
VOUT1
C3
1uF
V
OUT1
RT9006A/B
RST
CT
C
CT
V
IN2
5V
VIN2 VOUT2
GND
C4
1uF
V
OUT2
C2
1uF
DS9006A/B-05
September 2007
www.richtek.com
1
RT9006A/B
Functional Pin Description
Pin No.
1
2
3
4
5
6
7, 8
Pin Name Pin Function
VOUT1
VIN1
VIN2
VOUT2
CT
RST
GND
Channel 1 Output Voltage
Channel 1 Supply Voltage
Channel 2 Supply Voltage
Channel 2 Output Voltage
RESET Delay Capacitor
Detect VOUT 2 Output Voltage
Common Ground
The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Exposed Pad (9) GND
Function Block Diagram
Shutdown
and
Logic Control
V
REF
+
-
Error
Amplifier
VIN1
MOS Driver
VOUT1
Current-Limit
and
Thermal
Protection
VIN2
+
-
CT
Error
Amplifier
MOS Driver
Current-Limit
and
Thermal
Protection
VOUT2
V
REF
RST
-
+
VD
Comparator
GND
RESET Waveform
V
OUT2
3.3V
2.8V
ΔV
HYS
Td
RST
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2
DS9006A/B-05
September 2007
RT9006A/B
Absolute Maximum Ratings
(Note 1)
Input Voltage, V
IN1
, V
IN2
--------------------------------------------------------------------------------------------- 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) -----------------------------------------------------------------------------------------------
1.33W
Package Thermal Resistance (Note 4)
SOP-8 (Exposed Pad),
θ
JA
------------------------------------------------------------------------------------------ 75°C/W
SOP-8 (Exposed Pad),
θ
JC
----------------------------------------------------------------------------------------- 28°C/W
Junction Temperature ------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ---------------------------------------------------------------------------
260°C
Storage Temperature Range ----------------------------------------------------------------------------------------
–65°C
to 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------ 2kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions
(Note 3)
Input Voltage, V
IN1
, V
IN2
--------------------------------------------------------------------------------------------- 2.8V to 5.5V
Junction Temperature Range ----------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ----------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN1
= V
IN2
= 5V, C1 = C2 = 1
μ
F, C3 = C4 = 1
μ
F (Ceramic), T
A
= 25°C, unless otherwise specified)
Parameter
Regulator 1
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
Load Regulation
Symbol
Test Conditions
Min
Typ
Max
Units
V
OUT1
I
OUT1
= 30mA (RT9006A)
I
OUT1
= 30mA (RT9006B)
I
OUT1
= 200mA (Note5)
1.773
1.478
--
--
1.8
1.5
--
5
1.827
1.523
80
30
V
ppm/°C
mV
ΔV
LOAD1
1mA < I
OUT1
<100mA
V
IN1
= 2.8V to 5.5V,
I
OUT1
= 30mA (RT9006A)
V
IN1
= 2.5V to 5.5V,
I
OUT1
= 30mA (RT9006B)
f = 100Hz, I
OUT1
= 100mA
V
IN1
= 5.0V, V
OUT1
short to
GND
I
OUT1
= 0A
Line Regulation
V
LINE1
--
0.1
0.2
%/V
Power Supply Rejection Rate
Current Limit
Quiescent Current
PSRR1
I
LIM1
I
Q1
--
400
--
--
--
−60
--
30
170
40
--
600
--
--
--
dB
mA
mA
°C
°C
Thermal Shutdown Protection T
SD1
Thermal Shutdown Hysteresis T
SD1
Regulator 2
Output Voltage Accuracy
Output Voltage Temperature
Coefficient
V
OUT2
I
OUT2
= 30mA
I
OUT2
= 200mA
(Note5)
3.25
--
3.3
--
3.35
80
V
ppm/°C
To be continued
DS9006A/B-05
September 2007
www.richtek.com
3
RT9006A/B
Parameter
Load Regulation
Dropout Voltage
Quiescent Current
Line Regulation
Power Supply Rejection Rate
Current Limit
Symbol
Test Conditions
Min
--
--
--
--
--
--
500
--
--
Typ
5
50
150
40
0.1
−60
--
170
40
Max
30
90
200
--
0.2
--
700
--
--
mA
%/V
dB
mA
°C
°C
Units
mV
mV
ΔV
LOAD2
1mA < I
OUT2
< 100mA
V
DROP2_1
I
OUT2
= 30mA
V
DROP2_2
I
OUT2
= 100mA
I
Q2
ΔV
LINE2
PSRR2
I
LIM2
I
OUT2
= 0A
V
IN2
= 4.3V to 5.5V,
I
OUT2
= 30mA
f = 100Hz, I
OUT2
= 100mA
V
IN2
= 5.0V, V
OUT2
short to GND
Thermal Shutdown Protection T
SD2
Thermal Shutdown Hysteresis
ΔT
SD2
Detector
Detect Falling Voltage
Hysteresis
Sink Current
CT Source Current
V
DF
ΔV
HYS
I
RST
I
CT
V
RST
= 0.5V, V
IN2
= 5.0V
2.744
--
7.0
2.1
2.8
--
12.0
2.6
2.856
140
--
3.1
V
mV
mA
uA
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.
θ
JA
is measured in the natural convection at T
A
= 25°C on a high effective thermal conductivity test board (4 Layers,
2S2P) of JEDEC 51-7 thermal measurement standard. The case point of
θ
JC
is on the expose pad for SOP-8 (Exposed
Pad) package.
Note 5.
Guaranteed by design.
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DS9006A/B-05
September 2007
RT9006A/B
Typical Operating Characteristics
C1 = C2 = 1uF(X7R), C3 = C4 = 1uF(X7R), R
RST
= 100kΩ, unless otherwise specified.
Ω
Output Voltage vs. Temperature
4.0
3.5
Quiescent Current vs. Temperature
100
RT9006B
V
IN1
= V
IN2
= 4.3V
RT9006A
V
IN1
= V
IN2
= 4.3V
Quiescent Current (uA)
125
V
OUT2
90
Output Voltage (V)
3.0
2.5
2.0
80
70
V
OUT1
1.5
1.0
-50
-25
0
25
50
75
100
60
50
-50
-25
0
25
50
75
100
125
Temperature
(°C)
Temperature
(°C)
Detect Falling Voltage vs. Temperature
2.9
20
PSRR
RT9006A, V
OUT1
V
IN1
= V
IN2
= 4.3V
±
0.1V
V
OUT2
0
Detect Falling Voltage (V)
2.85
PSRR (dB)
-20
2.8
-40
2.75
I
LOAD
= 100mA
-60
I
LOAD
= 10mA
2.7
-50
-25
0
25
50
75
100
125
-80
0.01
10
0.1
100
1k
1000
10k
10000
100k
100000
1000k
1000000
Temperature
(°C)
(kHz)
Frequency (Hz)
Dropout Voltage vs. Load Current
700
600
RST Pin Sinking Current vs. Input Voltage
40
RT9006B, V
OUT2
RST Pin Sinking Current (mA)
35
30
25
20
15
RT9006A
V
RST
= 0.5V
T
A
= -40°C
T
A
= 25°C
Dropout Voltage (mV)
500
400
300
T
J
= 125°C
T
J
= 25°C
T
J
= -40°C
200
100
0
0
100
200
300
400
500
T
A
= 125°C
10
5
0
0
0.5
1
1.5
2
2.5
3
Load Current (mA)
Input Voltage (V)
DS9006A/B-05
September 2007
www.richtek.com
5
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