RT9086
250mA, Ultra-Low Noise, Low Quiescent Current, LDO
Regulator
General Description
Features
The RT9086 is a high performance positive low dropout
(LDO) regulator designed for applications requiring
very low dropout voltage and ultra-high Power Supply
Ripple Rejection (PSRR) low noise, low quiescent
current that can supply up to 250mA output current.
The input voltage range is from 2.2V to 5.5V. The
device is designed to work with a 1F input and a 1F
output ceramic capacitor (no separate noise bypass
capacitor is required).
The RT9086 features a precise 2% output regulation
over line, load, and temperature variations in
WL-CSP-4B 0.67x0.67 (BSC) package. The output
voltage is available from 1.2V to 4.5V in 25mV steps.
Ordering Information
Virtually Zero IQ (Disable) : < 1A
Very Low IG (Enabled) : 16A
Start-up Time : 80s
−40°C to 125°C Operating Junction Temperature
Range
Excellent Noise Immunity
RT9086
Package Type
B : SOT-23-5
QZ : ZQFN-4L 1x1
WSC : WL-CSP-4B 0.67x0.67 (BSC)
Lead Plating System
G : Green
(Halogen Free and Pb Free)
(For SOT-23-5 and ZQFN-4L 1x1 Only)
Output Voltage
(Refer to Output Voltage Table)
Richtek products are :
RoHS compliant and compatible with the current
requirements of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering
processes.
Simplified Application Circuit
Input Voltage
CIN
1μF
VOUT
VIN
COUT
1μF
Output Voltage
RT9086
Enable
EN
Fast Response Overload and Line Transient
Stable with a 1F Input and Output Ceramic
Capacitors
Accurate Output Voltage 2% Overload, Line,
Process, and Temperature Variations
Over-Current Protection
Over-Temperature Protection
Applications
Note :
Input Voltage Range : 2.2V to 5.5V
Adjustable Output Voltage : 1.2V to 4.5V
PSRR
85dB @ 1kHz (20mA)
80dB @ 10kHz (20mA)
Output Current : 250mA
Very Low Dropout : 120mV
Very Low IQ (Enabled) : 16A
Mobile Phones, Tablets
Digital Cameras and Audio Devices
Portable and Battery-Powered Equipment
Portable Medical Equipment
Smart Meters
IP Cameras
Drones
Telecom/Networking Cards
Wireless Infrastructures
Medical Equipments
Marking Information
For marking information, contact our sales
representative directly or through a Richtek distributor
located in your area.
GND
GND
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February 2020
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RT9086
Pin Configuration
(TOP VIEW)
VOUT
NC
5
4
2
VOUT
4
1
VIN
GND
3
GND
VIN GND EN
SOT-23-5
2
5
3
ZQFN-4L 1x1
EN
VIN
A1
A2
VOUT
EN
B1
B2
GND
WL-CSP-4B 0.67x0.67 (BSC)
Functional Pin Description
Pin No.
Pin Name
Pin Function
SOT-23-5
ZQFN-4L 1x1
WL-CSP-4B
0.67x0.67
1
4
A1
VIN
Supply input. A minimum of 1F ceramic capacitor
should be placed as close as possible to this pin for
better noise rejection.
2
2
B2
GND
Common ground.
3
3
B1
EN
Enable control input. Connecting this pin to logic high
enables the regulator or driving this pin low puts it
into shutdown mode. EN can be connected to GND if
not used.
4
--
--
NC
No internal connection.
5
1
A2
VOUT
Output of the regulator. Decouple this pin to GND
with at least 1F for stability.
--
5
(Exposed Pad)
--
GND
Thermal pad for ZQFN-4L 1x1 package, connect to
GND.
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is a registered trademark of Richtek Technology Corporation.
DS9086-07
February 2020
RT9086
RT9086 Output Voltage Table
VOUT = 1.2V to 1.575V
VOUT = 1.6V to 1.975V
VOUT = 2V to 2.375V
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
1.2
12
1.6
16
2
20
1.225
1A
1.625
1P
2.025
2C
1.25
1B
1.65
1Q
2.05
2D
1.275
1C
1.675
1R
2.075
2E
1.3
13
1.7
17
2.1
21
1.325
1D
1.725
1S
2.125
2F
1.35
1E
1.75
1T
2.15
2G
1.375
1F
1.775
1U
2.175
2H
1.4
14
1.8
18
2.2
22
1.425
1G
1.825
1V
2.225
2J
1.45
1H
1.85
1W
2.25
2K
1.475
1J
1.875
1Y
2.275
2M
1.5
15
1.9
19
2.3
23
1.525
1K
1.925
1Z
2.325
2N
1.55
1M
1.95
2A
2.35
2P
1.575
1N
1.975
2B
2.375
2Q
VOUT = 2.4V to 2.775V
VOUT = 2.8V to 3.175V
VOUT = 3.2V to 3.575V
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
2.4
24
2.8
28
3.2
32
2.425
2R
2.825
3E
3.225
3T
2.45
2S
2.85
3F
3.25
3U
2.475
2T
2.875
3G
3.275
3V
2.5
25
2.9
29
3.3
33
2.525
2U
2.925
3H
3.325
3W
2.55
2V
2.95
3J
3.35
3Y
2.575
2W
2.975
3K
3.375
3Z
2.6
26
3
30
3.4
34
2.625
2Y
3.025
3M
3.425
4A
2.65
2Z
3.05
3N
3.45
4B
2.675
3A
3.075
3P
3.475
4C
2.7
27
3.1
31
3.5
35
2.725
3B
3.125
3Q
3.525
4D
2.75
3C
3.15
3R
3.55
4E
2.775
3D
3.175
3S
3.575
4F
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RT9086
VOUT = 3.6V to 3.975V
VOUT = 4V to 4.375V
VOUT = 4.4V to 4.5V
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
VOUT
Output Voltage
Code
3.6
36
4
40
4.4
44
3.625
4G
4.025
4V
4.425
5J
3.65
4H
4.05
4W
4.45
5K
3.675
4J
4.075
4Y
4.475
5M
3.7
37
4.1
41
4.5
45
3.725
4K
4.125
4Z
3.75
4M
4.15
5A
3.775
4N
4.175
5B
3.8
38
4.2
42
3.825
4P
4.225
5C
3.85
4Q
4.25
5D
3.875
4R
4.275
5E
3.9
39
4.3
43
3.925
4S
4.325
5F
3.95
4T
4.35
5G
3.975
4U
4.375
5H
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is a registered trademark of Richtek Technology Corporation.
DS9086-07
February 2020
RT9086
Functional Block Diagram
VOUT
VIN
VREF
POR
+
+
-
RFILTER
RSEL
CFILTER
RAD
RFB
+
EN
1M
GND
VREF_EN
Operation
Basic Operation
Over-Temperature Protection (OTP)
The RT9086 is a high performance positive low dropout
(LDO) regulator designed for applications requiring
The over-temperature protection function will turn off
the P-MOSFET when the junction temperature
very low dropout voltage, ultra-high Power Supply
Ripple Rejection (PSRR), low noise and low quiescent
current that can supply up to 250mA output current.
The input voltage range is from 2.2V to 5.5V. The
RT9086 features a precise 2% output regulation over
line, load, and temperature variations. The output
exceeds 160C (typ.), and the output current exceeds
250mA. Once the junction temperature cools down by
approximately 26C (typ.), the regulator will
automatically resume operation.
voltage is available from 1.2V to 4.5V in 25mV steps.
The minimum required output capacitance for stable
operation is 1F (X5R or X7R) effective capacitance
after consideration of the temperature and voltage
coefficient of the capacitor.
The RT9086 provides current limit function to prevent
the device from damages during overload or
shorted-circuit condition. This current is detected by an
internal sensing transistor.
Enable and Shutdown Operation
The Error Amplifier compares the internal reference
voltage with the output feedback voltage from the
The RT9086 goes into shutdown mode when the EN
pin is in a logic low condition. In this condition, the pass
transistor, error amplifier, and bandgap are all turned
off, reducing the supply current to only 1A (max.). If
the shutdown mode is not required, the EN pin can be
directly tied to VIN pin to keep the LDO on.
Current Limit Protection
Error Amplifier
internal divider, and controls the Gate voltage of
P-MOSFET to support good line regulation and load
regulation at output voltage.
Output Automatic Discharge
The RT9086 output employs an internal 10 (typ.) pull
down resistance to discharge the output when the EN
pin is low, and the device is disabled.
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RT9086
Absolute Maximum Ratings
(Note 1)
VIN, EN to GND ------------------------------------------------------------------------------------------------------- 0.3V to 6V
VOUT to GND ---------------------------------------------------------------------------------------------------------- 0.3V to 6V
Power Dissipation, PD @ TA = 25C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.45W
ZQFN-4L 1x1 ----------------------------------------------------------------------------------------------------------- 1.07W
WL-CSP-4B 0.67x0.67 (BSC) -------------------------------------------------------------------------------------- 0.46W
Package Thermal Resistance
(Note 2)
SOT-23-5, JA ---------------------------------------------------------------------------------------------------------- 218.1C/W
SOT-23-5, JC ---------------------------------------------------------------------------------------------------------- 28.5C/W
ZQFN-4L 1x1, JA ----------------------------------------------------------------------------------------------------- 92.7C/W
ZQFN-4L 1x1, JC ----------------------------------------------------------------------------------------------------- 62.3C/W
WL-CSP-4B 0.67x0.67 (BSC), JA -------------------------------------------------------------------------------- 214.9C/W
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------- 260C
Junction Temperature ------------------------------------------------------------------------------------------------ 150C
Storage Temperature Range --------------------------------------------------------------------------------------- 65C to 150C
ESD Susceptibility
(Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
Input Voltage Range -------------------------------------------------------------------------------------------------- 2.2V to 5.5V
Output Current --------------------------------------------------------------------------------------------------------- 0mA to 250mA
Ambient Temperature Range--------------------------------------------------------------------------------------- 40C to 85C
Junction Temperature Range -------------------------------------------------------------------------------------- 40C to 125C
Electrical Characteristics
(VIN = VOUT + 1V, VEN = 1.2V, IOUT = 1mA, CIN = 1F, COUT = 1F, TA = 25C, unless otherwise specified)
Parameter
Input Voltage
Output Voltage Accuracy
(Note 5)
Symbol
VIN
VOUT_ACC
Test Conditions
Min
Typ
Max
Unit
VIN = VOUT + 1V
2.2
--
5.5
V
VIN = (VOUT + 1V) to 5.5V, IOUT = 1
mA to 250mA, package : WL-CSP-4B
0.67x0.67 (BSC)
2
--
2
VIN = (VOUT + 1V) to 5.5V, IOUT = 1
mA to 250mA, package : SOT-23-5
and ZQFN-4L 1x1
3
--
3
VIN = (VOUT + 1V) to 5.5V, IOUT = 1mA
--
0.02
--
%/V
--
0.001
--
%/mA
0
--
250
mA
250
--
--
mA
Line Regulation
VOUT_LineReg
Load Regulation
VOUT_LoadReg IOUT = 1mA to 250mA
LOAD Current
IOUT
Operation in stable and regulated
output voltage
Maximum Output Current IOUT_MAX
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%VOUT
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DS9086-07
February 2020
RT9086
Parameter
Symbol
Test Conditions
Min
Typ
Max
--
16
25
--
300
425
VEN = 0.3V (Disable)
--
0.2
1
VEN = 1.2V, IOUT = 0mA
--
16
--
VOUT ≥ 2.2V, IOUT = 100mA
--
50
--
VOUT ≥ 2.2V, IOUT = 250mA
(SOT-23-5 and WL-CSP-4B
0.67x0.67 (BSC) package)
--
120
200
VOUT ≥ 2.2V, IOUT = 250mA
(ZQFN-4L 1x1 package)
--
--
250
f = 100Hz, IOUT = 20mA
--
88
--
f = 1kHz, IOUT = 20mA
--
85
--
f = 10kHz, IOUT = 20mA
--
80
--
f = 100kHz, IOUT = 20mA
--
60
--
BW = 10Hz to 100kHz, IOUT = 1mA
--
10
--
BW = 10Hz to 100kHz, IOUT = 250mA
--
6.5
--
VEN < 0.3V
--
10
--
VEN = 1.2V, IOUT = 0mA
Quiescent Current
(Note 6)
Ground Current
(Note 8)
Dropout Voltage
(Note 9)
Power Supply Rejection
Ration (Note 7)
IQ
IG
VDROP
PSRR
Output Noise Voltage
(Note 7)
eN
Output Automatic
Discharge Pulldown
Resistance
RAD
VEN = 1.2V, IOUT = 250mA
(Note 7)
Unit
A
A
mV
dB
Vrms
EN Pin Logic Input Threshold
Low Input Threshold
VIL
VIN = 2.2 to 5.5V, VEN falling until the
output is disabled
--
--
0.4
V
High Input Threshold
VIH
VIN = 2.2 to 5.5V, VEN rising until the
output is enabled
1.2
--
--
V
Input Current at EN PIN
IEN
VEN = 5.5V and VIN = 5.5V
--
5.5
--
VEN = 0V and VIN = 5.5V
--
0.001
--
VIN = VOUT + 1V to VOUT + 1.6V in
30s
1
--
--
VIN = VOUT + 1.6V to VOUT + 1V in
30s
--
--
1
IOUT = 1mA to 250mA in 10s
40
--
--
IOUT = 250mA to 1mA in 10s
--
--
40
--
--
5
%
--
80
150
s
250
500
--
mA
A
Transient Characteristics
Line Transient
(Note 7)
VOUT_Line
Load Transient
(Note 7)
VOUT_Load
Overshoot on Start-Up
VOUT_Startup Stated as a percentage of VOUT(NOM)
Start-Up Time
tstart
From VEN > VIH to VOUT = 95% of
VOUT
Short Circuit Current
Limit
ISC
Temp = 25°C
Thermal Shutdown
TSD
--
160
--
°C
Thermal Hysteresis
TSD_H
--
26
--
°C
mV
mV
Protection
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RT9086
Note 1. Stresses beyond those listed under “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. JA is measured under natural convection (still air) at TA = 25°C with the component mounted on a high
effective-thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard. JC is measured
at the top of the package.
Note 3. Devices are ESD sensitive.
Note 4. The device is not guaranteed to function outside its operating conditions.
Note 5. Maximum available load IOUT_SUPPORT with different VIN due to thermal consideration refers to the curves at Typical
Operating Characteristics.
Note 6. Quiescent current is defined here as the difference in current between the input voltage source and the load at VOUT.
Note 7. This specification is guaranteed by design.
Note 8. Ground current is defined here as the total current flowing to ground as a result of all input voltages applied to the
device.
Note 9. Dropout voltage is the voltage difference between the input and the output at which the output voltage drops to 100mV
below its nominal value.
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DS9086-07
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RT9086
Typical Application Circuit
Input Voltage
CIN
1μF
VOUT
VIN
COUT
1μF
Output Voltage
RT9086
Enable
EN
GND
GND
BOM List
Reference
Part Number
Value
Package
Manufacturer
CIN, COUT
GRM155R61A105KE01
1F/10V/X5R
0402
MURATA
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RT9086
Typical Operating Characteristics
Quiescent Current vs. Output Current
Quiescent Current vs. Input Voltage
20
400
350
Quiescent Current (μA)
Quiescent Current (μA)
19
18
17
16
15
14
13
12
11
300
250
VIN = 3.2V
200
VIN = 3.8V
150
VIN = 5.2V
100
VIN = 5.5V
50
VOUT = 2.8V, IOUT = 0A
10
VOUT = 2.8V
0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
50
Input Voltage (V)
200
250
VEN Thresholds vs. Input Voltage
Output Voltage vs. Temperature
1.00
0.95
VEN Thresholds (V)
1.5
Output Voltage (%)
150
Output Current (mA)
2.0
1.0
0.5
0.0
-0.5
VIN = 5.5V
-1.0
VIN = 3.8V
-1.5
VIN = 3V
-25
0.90
0.85
VIL
0.80
0.75
0.70
0.65
0.55
VOUT = 2.8V, IOUT = 1mA
-50
VIH
0.60
-2.0
0
25
50
75
100
VOUT = 2.8V, IOUT = 0A
0.50
2.0
125
2.5
3.0
Temperature (°C)
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
Line Regulation
Load Regulation
2.900
2.900
2.875
2.875
VIN = 5V
VIN = 4.2V
2.850
Output Voltage (V)
Output Voltage (V)
100
VIN = 3.8V
2.825
VIN = 3V
2.800
2.775
2.750
2.725
ILOAD = 0.1A
2.850
ILOAD = 0.01A
2.825
ILOAD = 0.001A
2.800
2.775
2.750
2.725
VOUT = 2.8V
VOUT = 2.8V
2.700
2.700
0
50
100
150
200
Output Current (A)
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250
3.0
3.5
4.0
4.5
5.0
5.5
Input Voltage (V)
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DS9086-07
February 2020
RT9086
Dropout vs. Load Current
Noise Density Test
140
1000
120
100
100
10
Noise (µV)
Dropout (mV)
VOUT = 2.8V
80
60
40
1
0.1
0.01
20
VOUT = 2.8V,
Test under output voltage drops to 100mV
0
0.001
0.0001
0
50
100
150
200
Load Current (mA)
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DS9086-07
0mA
1mA
10mA
100mA
February
2020
250
10
100
1K
10K
100K
1M
10M
Frequency (Hz)
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RT9086
PSRR Loads Averaged 100Hz to 100kHz
PSRR Loads Averaged 10Hz to 10MHz
0
0
250mA
200mA
150mA
100mA
50mA
20mA
-40
-60
-20
PSRR (dB)
PSRR (dB)
-20
-80
-100
-40
250mA
200mA
150mA
100mA
50mA
20mA
-60
-80
-100
VOUT = 2.8V
VOUT = 2.8V
-120
0.1
1
10
Frequency (kHz)
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100
-120
0.01
0.1
1
10
100
1000
10000
Frequency (kHz)
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DS9086-07
February 2020
RT9086
Application Information
Like any low dropout linear regulator, the RT9086's
external input and output capacitors must be properly
selected for stability and performance. Use a 1F (X5R
or X7R) or larger input capacitor and place it close to
the IC's VIN and GND pins. Output capacitor effective
capacitance larger than 1F (X5R or X7R) requirement
may be used. Place the output capacitor close to the
IC's VOUT and GND pins. Increasing capacitance and
decreasing ESR can improve the circuit's PSRR and
line transient response.
to 5cm and the ceramic input capacitor can be placed
up to 1cm of the chip. Any good quality ceramic
capacitor can be used. However, a capacitor with
larger value and lower ESR (Equivalent Series
Resistance) is recommended since it will provide better
PSRR and line transient response.
The RT9086 is designed specifically to work with low
ESR ceramic output capacitor for space saving and
performance consideration. Using a ceramic capacitor
with capacitance of at least 1F (X5R or X7R) on the
RT9086 output ensures stability.
Chip Enable Operation
The RT9086 EN pin internal resistor is 1M to GND
The EN pin is the chip enable input. Pull the EN pin low
(< 0.4V) will shutdown the device. During shutdown
mode, the RT9086 quiescent current drops to lower
than 1A. Drive the EN pin to high (> 1.2V, < 5.5V) will
turn on the device again.
Minimum Operating Input Voltage (VIN)
Dropout Voltage
Thermal Considerations
The dropout voltage refers to the voltage difference
between the VIN and VOUT pins while operating at
specific output current. The dropout voltage VDROP
The junction temperature should never exceed the
absolute maximum junction temperature TJ(MAX), listed
under Absolute Maximum Ratings, to avoid permanent
also can be expressed as the voltage drop on the
pass-FET at specific output current (IRATED) while the
pass-FET is fully operating at ohmic region and the
pass-FET can be characterized as an resistance
RDS(ON). Thus the dropout voltage can be defined as
(VDROP = VVIN − VVOUT = RDS(ON) x IRATED). For
damage to the device. The maximum allowable power
dissipation depends on the thermal resistance of the IC
package, the PCB layout, the rate of surrounding
airflow, and the difference between the junction and
ambient temperatures. The maximum power
dissipation can be calculated using the following
normal operation, the suggested LDO operating range
is (VVIN > VVOUT + VDROP) for good transient response
formula :
and PSRR ability. Vice versa, while operating at the
ohmic region will degrade these performance severely.
Output discharge automatilly the RT9086 output
employs an internal 10 pull-down resistance to
discharge the output when EN pin is low, and the
device is disabled.
CIN and COUT Selection
Like any low dropout regulator, the external capacitors
of the RT9086 must be carefully selected for regulator
stability and performance. Using a capacitor of at least
1F (X5R or X7R) is suitable. With a reasonable PCB
layout, the ceramic output capacitor can be placed up
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DS9086-07
February 2020
The RT9086 does not include any dedicated UVLO
circuitry. The RT9086 internal circuitry is not fully
functional until VIN is at least 2.2V. The output voltage
is not regulated until VIN has reached at least the
greater of 2.2 V or (VOUT + VDROP).
PD(MAX) = (TJ(MAX) - TA) / JA
where TJ(MAX) is the maximum junction temperature,
TA is the ambient temperature, and JA is the
junction-to-ambient thermal resistance.
For continuous operation, the maximum operating
junction temperature indicated under Recommended
Operating
Conditions
is
125°C.
The
junction-to-ambient thermal resistance, JA, is highly
package dependent. For a SOT-23-5 package, the
thermal resistance, JA, is 218.1°C/W on a standard
JEDEC 51-7 high effective-thermal-conductivity
four-layer test board. For a ZQFN-4L 1x1 package, the
thermal resistance, JA, is 92.7°C/W on a standard
JEDEC 51-7 high effective-thermal-conductivity
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13
RT9086
four-layer test board. For a WL-CSP-4B 0.67x0.67
(BSC) package, the thermal resistance, JA, is
214.9°C/W on a standard JEDEC 51-7 high
trace as is practical.
effective-thermal-conductivity four-layer test board. The
maximum power dissipation at TA = 25°C can be
calculated as below :
avoided. These add parasitic inductances and
resistance that results in inferior performance
especially during transient conditions.
Connections using long trace lengths, narrow trace
widths, and/or connections through vias must be
PD(MAX) = (125°C - 25°C) / (218.1°C/W) = 0.45W for a
SOT-23-5 package.
PD(MAX) = (125°C - 25°C) / (92.7°C/W) = 1.07W for a
ZQFN-4L 1x1 package.
PD(MAX) = (125°C - 25°C) / (214.9°C/W) = 0.46W for a
WL-CSP-4B 0.67x0.67 (BSC) package.
VIN
VOUT
RT9086
CIN
GND
COUT
1
VIN
2
GND
3
EN
VOUT
5
The maximum power dissipation depends on the
operating ambient temperature for the fixed TJ(MAX)
and the thermal resistance, JA. The derating curves in
Figure 1 allows the designer to see the effect of rising
ambient temperature on the maximum power
dissipation.
VEN
4 Power Ground
NC
GND Pin (2) connect to second layer ground path by
Via to increase cooling area directly.
Figure 2. SOT-23-5 Layout Guide
Maximum Power Dissipation (W)1
1.2
Four-Layer PCB
1.0
ZQFN-4L 1x1
0.8
VOUT
VIN
0.6
WL-CSP-4B 0.67x0.67 (BSC)
COUT
0.4
1
0.2
CIN
RT9086
SOT-23-5
4
5
0.0
GND
0
25
50
75
100
125
Ambient Temperature (°C)
2
3
Figure 1. Derating Curve of Maximum Power
Dissipation
Layout Considerations
The dynamic performance of the RT9086 is dependent
on the layout of the PCB. PCB layout practices that are
adequate for typical LDOs may degrade the PSRR,
noise, or transient performance of the RT9086.
VEN
Power Ground
GND Pad (2) and (5) connect to second layer ground path by Via
to increase cooling area directly.
Figure 3. ZQFN-4L 1x1 Layout Guide
Best performance is achieved by placing CIN and COUT
on the same side of the PCB as the RT9086, and as
close to the package as is practical. The ground
connections for CIN and COUT must be back to the
RT9086 ground pin using as wide and short a copper
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
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14
is a registered trademark of Richtek Technology Corporation.
DS9086-07
February 2020
RT9086
VOUT
VIN
COUT
CIN
RT9086
VIN
A1
VOUT
A2
EN
GND
B1
B2
VEN
Power Ground
GND ball (B2) connect to second layer ground path by Via
to increase cooling area directly.
Figure 4. WL-CSP-4B 0.67x0.67 (BSC) Layout Guide
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
DS9086-07
February 2020
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
15
RT9086
Outline Dimension
H
D
L
B
C
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.889
1.295
0.035
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.356
0.559
0.014
0.022
C
2.591
2.997
0.102
0.118
D
2.692
3.099
0.106
0.122
e
0.838
1.041
0.033
0.041
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
SOT-23-5 Surface Mount Package
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16
is a registered trademark of Richtek Technology Corporation.
DS9086-07 February 2020
RT9086
1
1
2
2
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.300
0.400
0.012
0.016
A1
0.000
0.050
0.000
0.002
A3
0.117
0.162
0.005
0.006
b
0.175
0.275
0.007
0.011
D
0.900
1.100
0.035
0.043
D2
0.450
0.550
0.018
0.022
E
0.900
1.100
0.035
0.043
E2
0.450
0.550
0.018
0.022
e
L
0.625
0.200
0.025
0.300
0.008
0.012
H
0.039
0.002
H1
0.064
0.003
Z-Type 4L QFN 1x1 Package
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
DS9086-07 February 2020
is a registered trademark of Richtek Technology Corporation.
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17
RT9086
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.355
0.445
0.014
0.018
A1
0.135
0.165
0.005
0.006
b
0.190
0.230
0.007
0.009
D
0.630
0.710
0.025
0.028
D1
E
0.350
0.630
0.014
0.710
0.025
0.028
E1
0.350
0.014
e
0.350
0.014
4B WL-CSP 0.67x0.67 Package (BSC)
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18
is a registered trademark of Richtek Technology Corporation.
DS9086-07 February 2020
RT9086
Footprint Information
Footprint Dimension (mm)
Package
Number of
Pin
P1
P2
A
B
C
D
M
TSOT-25/TSOT-25(FC)/SOT-25
5
0.95
1.90
3.60
1.60
1.00
0.70
2.60
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
DS9086-07 February 2020
Tolerance
±0.10
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
19
RT9086
Package
Number of
Pin
U/X/ZQFN1x1-4
4
Footprint Dimension (mm)
P
Ax
Ay
By
C
C1
D
D1
Sx
Sy
0.625 1.800 0.900 0.450 0.350 0.675 0.474 0.275 0.074 0.400 0.400
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
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20
Bx
Tolerance
±0.050
is a registered trademark of Richtek Technology Corporation.
DS9086-07 February 2020
RT9086
Package
Number of
Pin
WL-CSP0.67x0.67-4(BSC)
4
Type
NSMD
SMD
Footprint Dimension (mm)
e
0.350
A
B
0.200
0.300
0.230
0.200
Tolerance
±0.025
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
Copyright © 2020 Richtek Technology Corporation. All rights reserved.
DS9086-07 February 2020
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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