Richtek RT9018A-10GQW, RT9018A-12GQW, RT9018A-12PQW, RT9018A-15GQW, RT9018A-18GQW Schematic [ru]

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Maximum 3A, Ultra Low Dropout Regulator
RT9018A/B
General Description
The RT9018A/B is a high performance positive voltage
regulator designed for use in applications requiring very
low Input voltage and very low dropout voltage at up to
3A(Peak). It operates with a VIN as low as 1.4V and VDD
voltage 3V with output voltage programmable as low as
0.8V. The significant feature includes ultra low dropout,
ideal for applications where VOUT is very close to VIN.
Additionally, there is an enable pin to further reduce power
dissipation while shutdown. The RT9018A/B provides
excellent regulation over variations in line, load and
temperature. and provides a power OK signal to indicate
if the voltage level of Vo reaches 90% of its rating value.
The RT9018A/B is available in the SOP-8 (Exposed Pad)
and WDFN-10L 3x3 packages with 1V, 1.05V, 1.2V, 1.5V,
1.8V and 2.5V internally preset outputs that are also
adjustable using external resistors.
RT9018A/B-
Package Type SP : SOP-8 (Exposed Pad-Option 1) QW : WDFN-10L 3x3
Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free)
Output Voltage 10 : 1V/Adj 1K : 1.05V/Adj 12 : 1.2V/Adj 15 : 1.5V/Adj 18 : 1.8V/Adj 25 : 2.5V/Adj
Enable Pin Function A : Internal Pull High B : Internal Pull Low
Note :
Richtek 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.
Features
zz
z Maximum 3A Low-Dropout Voltage Regulator
zz
zz
z High Accuracy Output Voltage
zz
zz
z Typically 210mV Dropout at 3A
zz
zz
z Power Good Output
zz
zz
z Output Voltage Pull Low Resistance when Disable
zz
zz
z Thermal and Over Current Protection
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
zz
±±
±1.5%
±±
Applications
z Front Side Bus VTT (1.2V/3A)
z NoteBook PC Applications
z Motherboard Applications
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configurations
(TOP VIEW)
GND
GND
8
GND
7
ADJ
6
9
11
VOUT
5
NC
VDD
10
9
VIN
8
VIN
7
VIN
9
EN
PGOOD
EN
VIN
VDD
2
3
4
SOP-8 (Exposed Pad)
1
VOUT
2
VOUT
3
VOUT
4
ADJ
PGOOD
5
WDFN-10L 3x3
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
DS9018A/B-09 April 2012 www.richtek.com
1
RT9018A/B
Typical Application Circuit
10µF
VIN
EN
VDD
1µF
VOUT
RT9018A/B
PGOOD
GND
ADJ
V
100k
OUT
V
IN
Chip Enable
V
DD
Figure 1. Fixed Voltage Regulator Figure 2. Adjustable Voltage Regulator
10µF
V
OUT
V
IN
Chip Enable
R2R1
×=
R1
R2
+
R2
10µF
V
OUT
0.8 V
OUT
VIN
10µF
EN
V
DD
VDD
1µF
VOUT
RT9018A/B
PGOOD
GND
ADJ
C
Dummy
100k
V
OUT
Function
Pin Description
Pi n No.
SOP-8
(Exposed Pad)
WDFN -1 0L 3x3
3 7, 8, 9 VIN Supply Input Voltage.
2 6 EN Chip Enable (Active-High).
4 10 VDD Supply Voltage of Control Circuitry.
1 5 PGOOD Power Good Open Drain Output.
7 4 ADJ
6 1, 2, 3 VOUT Output Voltage.
5 -- NC No Internal Connection.
8,
9 (Exposed Pad)
11 (Exposed Pad) GND
Function Block Diagram
VIN
Pin Name
Pin Function
Set the output voltage by the internal feedback resistors when ADJ is grounded. If external feedback resistors is used, V
OUT
=
0.8V x (R 1 + R2) /R2.
Ground. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.
VOUT
OCP
OTP
EN
VDD
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
POR
Driver
0.8V
0.72V
+
Error
Amplifier
-
­+
Mode
ADJ
PGOOD
GND
DS9018A/B-09 April 2012www.richtek.com
2
RT9018A/B
Absolute Maximum Ratings (Note 1)
z Supply Voltage, VIN ------------------------------------------------------------------------------------------------------ 1V to 6V
z Control Voltage, VDD ----------------------------------------------------------------------------------------------------- 3V to 6V
z Output Voltage, VOUT --------------------------------------------------------------------------------------------------- 0.8 to 6V
z Power Dissipation, P
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------------- 1.33W
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------------- 1.67W
z Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θJA---------------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θJC--------------------------------------------------------------------------------------------- 15°C/W
WDFN-10L 3x3, θJA------------------------------------------------------------------------------------------------------- 60°C/W
z Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- 65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
@ TA = 25°C
D
Recommended Operating Conditions (Note 4)
z Supply Voltage, V
z Control Voltage, VDD
z Control Voltage with PGOOD, VDD
z Junction Temperature Range -------------------------------------------------------------------------------------------- 40°C to 125°C z Ambient Temperature Range -------------------------------------------------------------------------------------------- 40°C to 85°C
------------------------------------------------------------------------------------------------------- 1.4V to 5.5V
IN
(VDD
> V
+ 1.5V) -------------------------------------------------------------------------- 3V to 5.5V
OUT
(Note 8) ----------------------------------------------------------------------- 4.5V to 5.5V
Electrical Characteristics
(V
= V
IN
+ 500mV, V
OUT
Parameter Symbol Test Conditions Min Typ Max Unit
POR Threshold 2.4 2.7 3 V
POR Hysteresis 0.15 0.2 -- V
Adjustable Pin Threshold V
Reference Voltage (ADJ Pin Voltage) V
Fixed Output Voltage Range ΔV
Line Regulation (VIN) ΔV
Load Regulation (Note 5) ΔV
Dropout Voltage (Note 6) V
Quiescent Current (Note 7) IQ V
Current Limit I
EN
= V
DD
= 5V, C
= C
IN
= 10μF, T
OUT
TH_ADJ
I
ADJ
1.5 0 1.5 %
OUT
LINE_IN
LOAD
DROP
3.2 4.5 -- A
LIM
= T
A
I
OUT
OUT
V
IN
I
OUT
V
IN
I
OUT
I
OUT
I
OUT
DD
= 25°C, unless otherwise specified)
J
= 1mA -- 0.2 0.4 V
= 1mA 0.788 0.8 0.812 V
= V
= V
+ 0.5V to 5V,
OUT
= 1mA
+ 1V,
OUT
= 1mA to 3A
-- 0.2 0.6 %
-- 0.2 1 %
= 2A -- 150 250
= 3A -- 210 350
mV
= 5.5V -- 0.6 1.2 mA
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
©
DS9018A/B-09 April 2012 www.richtek.com
3
RT9018A/B
Parameter Symbol Test Conditions Min Typ Max Unit
Short Circuit Current
In-rush Current
V
Pull Low Resistance
OUT
V
< 0.2V 0.5 1.8 -- A
OUT
= 10μF, Enable Start-up -- 0.6 -- A
C
OUT
= 0V -- 150 -- Ω
V
EN
Chip Enable
EN Input Bias Current IEN V
Current
EN Threshold Voltage
RT9018A -- 10 20 VDD Shutdown
RT9018B
Logic-Low V
Logic-High V
I
VEN = 0V
SHDN
VDD = 5V -- -- 0.7
ENL
VDD = 5V 1.2 -- --
ENH
= 0V -- 12 -- μA
EN
-- -- 1
μA
V
Powe r Good
PGOOD Rising Threshold -- 90 93 %
PGOOD Hysteresis 3 10 -- %
PGOOD Sink Capability I
PGOOD
= 10mA -- 0.2 0.4 V
PGOOD Delay 0.5 1.5 5 ms
Thermal Protection
Thermal Shutdown Temperature TSD -- 160 -- °C
Thermal Shutdown Hysteresis ΔTSD -- 30 -- °C
Thermal Shutdown Temperature
Fold-back
V
< 0.4V -- 110 -- °C
OUT
Note 1. Stresses beyond those listed 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 may
affect device reliability.
Note 2. θ
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 2ms current pulse. Devices are tested for load
Note 6. The dropout voltage is defined as V Note 7. Quiescent, or ground current, is the difference between input and output currents. It is defined by I
Note 8. The control voltage must within 4.5V to 5.5V when using PGOOD function.
is measured at T
JA
measured at the exposed pad of the package.
regulation in the load range from 1mA to 3A.
load condition (I
current.
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
A
-V
IN
= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
OUT
, which is measured when V
OUT
OUT
is V
OUT(NORMAL)
- 100mV.
= IIN - I
Q
under no
OUT
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
4
©
DS9018A/B-09 April 2012www.richtek.com
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