RT9186A/B
Low Profile 500mA LDO with Enable and Power Good/Reset
General Description
The RT9186 is a low-dropout linear regulator providing up
to 500mA load current with 160mV dropout. It is especially
designed for the application of portable and smart handheld
device.
The RT9186 operates from 2.5V to 5.5V supply. The
internal P-MOSFET pass transistor allows the regulator
to work with 190µA low quiescent current. Its preset output
voltage version covers the most frequently used values,
including 1.8V/2.5V/3.3V. Output voltage can also be
adjusted via the ADJ pin for those other than the preset
values.
With only 0.1µA required in the shut down mode, one
enable pin is able to control output on/off. RT9186A
contains PGOOD function. On the other hand, RT9186B
contains RST function with 6ms (typ.) time delay.
Features
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2.5V to 5.5V Wide Input Range
Guaranteed 500mA Output Current
Low 160mV Dropout at 500mA
1.8V/2.5V/3.3V Preset Output Voltage Version with
Adjustable Range from 0.8V to 4.5V.
Reset Output with 6ms (typ.) Delay Time
Power Good Output
Low 190µA Ground Pin Current
0.1µA Shutdown Current
Thermal and Over Current Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
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Ordering Information
RT9186A/B
−
Package Type
F : MSOP-8
QV : VDFN-8L 3x3 (V-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
Default : Adjustable
18 : 1.8V
25 : 2.5V
33 : 3.3V
A : Power Good Function
B : Reset Function
Notebook Computer
PDAs/SHDs
PCMCIA/Cardbus Card Product
Mobile Phone
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.
Pin Configurations
(TOP VIEW)
VIN
VIN
PGOOD
EN
8
2
3
4
7
6
5
VOUT
VOUT
ADJ
GND
VIN
VIN
PGOOG
EN
1
2
3
4
8
7
6
9
5
VOUT
VOUT
ADJ
GND
MSOP-8
RT9186A
VDFN-8L 3x3
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.
VIN
VIN
RST
EN
8
2
3
4
7
6
5
VOUT
VOUT
ADJ
GND
VIN
VIN
RST
EN
1
2
3
4
9
8
7
6
5
VOUT
VOUT
ADJ
GND
MSOP-8
RT9186B
VDFN-8L 3x3
DS9186AB-10 August 2007
www.richtek.com
1
RT9186A/B
Pin Description
Pin Name Pin Function
VIN
VOUT
GND
EN
PGOOD
RST
ADJ
Power Input Voltage.
Output Voltage.
Ground.
Chip Enable (Active-High). There should be a pull low resistor 100kΩ connected to GND
when the control signal is floating.
Power Good Indicator. (RT9186A).
Open-Drain Active-Low Reset Output. Connect a 100kΩ to VOUT to obtain output voltage.
In shutdown the RST output is low. (RT9186B).
Output Voltage Setting. Connect to GND for Fixed output voltage model.
Typical Application Circuit
V
IN
VIN
C
IN
1uF
VOUT
R
PGOOD/RST
100k
TO
µC
10uF
V
OUT
C
OUT
RT9186A/B
PGOOD/
RST
ADJ
GND
EN
Chip Enable
Figure 1. Fixed Voltage Regulator
V
IN
C
IN
1uF
VIN
VOUT
C
OUT
10uF
100k
TO
µC
V
OUT
RT9186A/B
EN
GND
PGOOD/
RST
ADJ
Chip Enable
R
1
V
OUT
=
0.8 (1
+
R
1
R
2
)
R
2
Figure 2. Adjustable Voltage Regulator
Note1 : R2 should be less than 80k to ensure regulation.
Note2 : X5R or X7R input capacitor
≧
1
µF
is recommended for output stability.
www.richtek.com
2
DS9186AB-10 August 2007
RT9186A/B
Function Block Diagram
VIN
Current Limit
Sensor
+
0.8V
Reference
Error
Amplifier
-
-
+
VOUT
EN
Shutdown
Logic
Thermal
Shutdown
ADJ
-
Output Mode
Comparator
PGOOD
+
Current Limit
Sensor
+
0.8V
Reference
Error
Amplifier
80%
Reference
VIN
EN
Shutdown
Logic
RST
+
+
Delay
Timer
-
-
80%
Reference
DS9186AB-10 August 2007
-
+
100mV
GND
-RT9186A-
-
-
+
VOUT
Thermal
Shutdown
ADJ
Output Mode
Comparator
100mV
GND
-RT9186B-
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3
RT9186A/B
Timing Diagram
V
IN
80% of V
OUT
(Normal)
V
OUT
PGOOD Function
(RT9186A)
Reset function
(RT9186B)
Delay Time (typ.) 6ms
Absolute Maximum Ratings
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(Note 1)
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Input Voltage ---------------------------------------------------------------------------------------------------------- 7V
Storage Temperature Range ---------------------------------------------------------------------------------------
−65°C
to 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260°C
Power Dissipation, PD @ T
A
= 25°C
MSOP-8 ---------------------------------------------------------------------------------------------------------------- 0.625W
VDFN-8L 3x3 ---------------------------------------------------------------------------------------------------------- 0.952W
Package Thermal Resistance (Note 4)
MSOP-8,
θ
JA
---------------------------------------------------------------------------------------------------------- 160°C/W
VDFN-8L 3x3,
θ
JA
---------------------------------------------------------------------------------------------------- 105°C/W
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
(Note 3)
Recommended Operating Conditions
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Input Voltage ---------------------------------------------------------------------------------------------------------- 2.5V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------
−40°C
to 85°C
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4
DS9186AB-10 August 2007
RT9186A/B
Electrical Characteristics
(V
IN
= V
OUT(NOM)
+ 500mV or V
IN
= +2.5V (whichever is greater), T
A
= 25°C, unless otherwise specified)
Parameter
General Specification
Input Under Voltage Lock-Out
Output Voltage Accuracy
(Preset Mode)
Adjustable Output Voltage Range
ADJ Pin Voltage
ADJ Input Bias Current
Short Circuit Current Limit
Quiescent Current
Dropout Voltage
(Note 6)
(Note 5)
Symbol
Test Conditions
Min
Typ
Max
Units
V
UVLO
∆V
OUT
V
OUT_ADJ
V
ADJ
I
ADJ
I
LIM
I
Q
V
DROP
∆V
LINE
V
ADJ
= +0.8V
V
OUT
= 0V
I
OUT
= 0mA
I
OUT
= 500mA
V
OUT
= 2.5V
V
OUT
= 3.3V
I
OUT
= 1mA to 500mA
2.0
−3
0.8
0.784
--
0.9
--
--
--
--
--
2.3
0
--
0.8
10
1.4
190
200
160
0.02
21
2.4
+3
4.5
0.816
100
2.0
250
330
220
0.125
40
V
%
V
V
nA
A
µA
mV
Line Regulation
Load Regulation
Chip Enable
Standby Current
Logic-Low Voltage
EN Threshold
Logic-High Voltage
EN Input Bias Current
Reset
Reset Output Low Voltage
Output High Leakage Current
Threshold to Output Voltage
Reset Delay Time
Power Good
PGOOD Output Low Voltage
Output High Leakage Current
Threshold to Output Voltage
Thermal Protection
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
(Note 7)
V
OUT
+ 0.1V
<
V
IN
<
5.5V
I
OUT
= 5mA
I
OUT
= 1mA to 500mA
%/V
mV
∆V
LOAD
I
STBY
V
ENL
V
ENH
I
EN
V
IN
= 5.5V
V
IN
= 2.5V
V
IN
= 5.5V
V
CE
= 5.5V
--
--
1.6
--
0.1
--
--
20
2
0.7
µA
V
--
100
nA
V
OL
Reset Output Sinking 2mA
V
RST
= 5V
Rising edge, referred to V
OUT
--
--
77
0.7
50
--
80
6
100
100
83
8
mV
nA
%
ms
T
DELAY
Rising edge of V
OUT
to V
RST
PGOOD Output sinking 2mA
--
--
50
--
80
100
100
83
mV
nA
%
V
PGOOD
= 5V
Rising edge, referred to
V
OUT
77
T
SD
∆T
SD
--
--
160
30
--
--
°C
°C
DS9186AB-10 August 2007
www.richtek.com
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