Download

RT8097B
2A, 1MHz, 6V CMCOT Synchronous Step-Down Converter
General Description
Features
The RT8097B is a high efficiency synchronous stepdown DC/DC converter. Its input voltage range is from
2.7V to 6V and provides an adjustable regulated output
voltage from 0.6V to 3.4V while delivering up to 2A of
output current.





Efficiency Up to 95%
RDSON 100m HS / 70m LS
VIN Range 2.7V to 6V
VREF 0.6V with 2% Accuracy at 25C
CMCOT ™ Control Loop Design
for
Best
Transient Response, Robust Loop Stability with
Low-ESR (MLCC) COUT
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The Current Mode

Soft-Start 1.2ms; PGOOD Function in SOT-23-6
Constant-On-time (CMCOT) operation with internal
compensation allows the transient response to be
optimized over a wide range of loads and output
capacitors. The RT8097B is available in the SOT-23-5/6
package.
Applications
Ordering Information
Pin Configurations



STB, Cable Modem, & xDSL Platforms
LCD TV Power Supply & Metering Platforms
General Purpose Point of Load (POL)
(TOP VIEW)
RT8097B
Package Type
B : SOT-23-5
E : SOT-23-6
Lead Plating System
G : Green (Halogen Free and Pb Free)
UVP Option
H : Hiccup
L : Latched-Off
FB
VIN
FB
5
4
6
2
B : Forced PWM
3
PG VIN
5
4
2
3
EN GND LX
EN GND LX
SOT-23-5
SOT-23-6
Note :
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
RT8097B
LX
VIN
VIN
CIN
L
VOUT
R1
EN
PG*
COUT
FB
GND
R2
*For SOT-23-6 Package Only
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT8097B
Marking Information
RT8097BHGE
RT8097BHGB
4L= : Product Code
DNN : Date Code
4L=DNN
1T=DNN
1T= : Product Code
DNN : Date Code
RT8097BLGE
RT8097BLGB
4K= : Product Code
DNN : Date Code
4K=DNN
1S=DNN
1S= : Product Code
DNN : Date Code
Functional Pin Description
Pin No.
Pin Name
Pin Function
SOT-23-5
SOT-23-6
1
1
EN
Enable Control Input.
2
2
GND
Power Ground.
3
3
LX
Switch Node.
4
4
VIN
Supply Voltage Input. The RT8097B operates from a 2.7V to 6V input.
5
6
FB
Feedback Voltage Input. An external resistor divider from the output to
GND, tapped to the FB pin, sets the output voltage.
--
5
PG
Power Good Indicator. The output of this pin is an open-drain with
external pull-up resistor. PG is pulled up when the FB voltage is within
90%, otherwise it is LOW.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Function Block Diagram
For SOT-23-5 Package
EN
VIN
UVLO
Shut Down
Control
OTP
FB
-
VREF
Error
Amplifier
Ton
Comparator
+
RC
CCOMP
+
-
Logic
Control
LX
VIN
Driver
Current
Limit
Detector
LX
GND
Current
Sense
LX
Ton
LX
For SOT-23-6 Package
EN
VIN
UVLO
Shut Down
Control
OTP
-
FB
VREF
Error
Amplifier
Comparator
+
+
RC
CCOMP
-
Logic
Control
VIN
Driver
Current
Limit
Detector
LX
GND
+
Current
Sense
-
LX
PG
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT8097B
Operation
The RT8097B is a synchronous low voltage step-down
converter that can support the input voltage range from
2.7V to 6V and the output current can be up to 2A. The
RT8097B uses a constant on-time, current mode
architecture. In normal operation, the high side PMOSFET is turned on when the switch controller is set
by the comparator and is turned off when the Ton
Enable Comparator
comparator resets the switch controller.
track the internal ramp voltage during soft-start interval.
The typical soft-start time is 1.2ms.
Low side MOSFET peak current is measured by internal
RSENSE. The error amplifier EA adjusts COMP voltage
by comparing the feedback signal (VFB) from the output
voltage with the internal 0.6V reference. When the load
current increases, it causes a drop in the feedback
voltage relative to the reference, then the COMP
voltage rises to allow higher inductor current to match
the load current.
UV Comparator
If the feedback voltage (VFB) is lower than threshold
voltage 0.2V, the UV comparator's output will go high
and the switch controller will turn off the high side
MOSFET. The output under voltage protection is
designed to operate in Hiccup mode for RT8097BH,
Latch mode for RT8097BL.
PGOOD Comparator
A logic-high enables the converter; a logic-low forces
the IC into shutdown mode.
Soft-Start (SS)
An internal current source charges an internal capacitor
to build the soft-start ramp voltage. The VFB voltage will
Over Current Protection (OCP)
The RT8097B provides over current protection by
detecting low side MOSFET valley inductor current. If
the sensed valley inductor current is over the current
limit threshold (3.1A typ.), the OCP will be triggered.
When OCP is tripped, the RT8097B will keep the over
current threshold level then cause the UV protection.
Thermal Shutdown (OTP)
The device implements an internal thermal shutdown
function when the junction temperature exceeds 150C.
The thermal shutdown forces the device to stop
switching when the junction temperature exceeds the
thermal shutdown threshold. Once the die temperature
decreases below the hysteresis of 20C, the device
reinstates the power up sequence.
When the feedback voltage (VFB) is higher than
threshold voltage 0.54V, the PGOOD open drain output
will be high impedance. The internal PG MOSFET is
typical 100. The PGOOD signal delay time from EN is
about 2ms.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
4
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Absolute Maximum Ratings
(Note 1)

Supply Input Voltage -------------------------------------------------------------------------------------------- 0.3V to 6.5V

LX Pin Switch Voltage------------------------------------------------------------------------------------------- 0.3V to (VIN + 0.3V)
<20ns ---------------------------------------------------------------------------------------------------------------- 4.5V to 7.5V

Power Dissipation, PD @ TA = 25C
SOT-23-5 ----------------------------------------------------------------------------------------------------------- 0.45W
SOT-23-6 ----------------------------------------------------------------------------------------------------------- 0.48W

Package Thermal Resistance
(Note 2)
SOT-23-5, JA ----------------------------------------------------------------------------------------------------- 218.1C/W
SOT-23-6, JA ----------------------------------------------------------------------------------------------------- 208.2C/W
SOT-23-5, JC ----------------------------------------------------------------------------------------------------- 28.5C/W
SOT-23-6, JC ----------------------------------------------------------------------------------------------------- 32C/W

Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------- 260C

Junction Temperature ------------------------------------------------------------------------------------------- 40C to 150C

Storage Temperature Range ---------------------------------------------------------------------------------- 65C to 150C

ESD Susceptibility
(Note 3)
HBM (Human Body Model) ------------------------------------------------------------------------------------ 2kV
Recommended Operating Conditions
(Note 4)

Supply Input Voltage -------------------------------------------------------------------------------------------- 2.7V to 6V

Ambient Temperature Range---------------------------------------------------------------------------------- 40C to 85C

Junction Temperature Range --------------------------------------------------------------------------------- 40C to 125C
Electrical Characteristics
(VIN = 3.6V, TA = 25C, unless otherwise specified)
Parameter
Symbol
Min
Typ
Max
Unit
2.7
--
6
V
0.588
0.6
0.612
V
VFB = 3.3V
--
--
1
A
Active ,VFB = 0.63V, Not Switching
--
300
--
Shutdown
--
--
1
Switching Leakage Current
--
--
1
A
Switching Frequency
--
1
--
MHz
Input Voltage
VIN
Feedback Reference Voltage
VREF
Feedback Leakage Current
IFB
DC Bias Current
Test Conditions
A
Switch On Resistance, Low
RNMOS
ISW = 0.3A
--
70
--
m
Switch On Resistance, High
RPMOS
ISW = 0.3A
--
100
--
m
Valley Current Limit
ILIM
2.2
3.1
3.9
A
Under-Voltage Lockout
Threshold
VUVLO
VDD Rising
--
2.25
2.5
V
VDD Falling
--
2
--
V
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
RT8097B
Parameter
Symbol
Test Conditions
Over-Temperature Threshold
Min
Typ
Max
Unit
--
150
--
°C
Logic-High
VIH
1.5
--
--
Logic-Low
VIL
--
--
0.4
Rising
--
90
--
Falling
--
85
--
--
--
100

--
1.2
--
ms
Minimum Off Time
--
120
--
ns
Output Discharge Switch On
Resistance
--
1.8
--
k
Enable Input
Voltage
PG Pin Threshold
(relative to VOUT)
PG Open-Drain Impedance
(PG = low)
Soft-Start Time
TSS
V
%
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. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. The first
layer of copper area is filled. JC is measured at the top of the package.
Note 3. Devices are ESD sensitive. Handling precaution recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
6
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Typical Application Circuit
VIN
CIN
22μF
RT8097B
LX
VIN
L
EN
CFF*
VOUT
R1
COUT
FB
PG*
GND
R2
*For SOT-23-6 Package Only
*CFF : Optional for performance fine-tune
Table 1. Suggested Component Values
VOUT (V)
R1 (k)
R2 (k)
CIN (F)
L (H)
COUT (F)
3.3
90
20
22
1.5
22
1.8
100
50
22
1.5
22
1.5
100
66.6
22
1.5
22
1.2
100
100
22
1.5
22
1.05
100
133
22
1.5
22
1
100
148
22
1.5
22
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
7
RT8097B
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
90
80
VIN = 5V, VOUT = 3.3V
80
70
VIN = 3.3V, VOUT = 1.2V
70
Efficiency (%)
Efficiency (%)
Efficiency vs. Output Current
100
60
50
40
30
50
40
30
20
10
10
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
VIN = 3.3V, VOUT = 1.2V
60
20
0
VIN = 5V, VOUT = 3.3V
0
0.001
2
0.01
Output Current (A)
Output Voltage vs. Output Current
1
3.40
1.26
3.38
1.24
1.22
1.20
1.18
1.16
3.36
3.34
3.32
3.30
3.28
1.14
VIN = 5V, VOUT = 3.3V
VIN = 3.3V, VOUT = 1.2V
1.12
3.26
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0
0.2
0.4
Output Current (A)
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Output Current (A)
Output Voltage vs. Input Voltage
Output Voltage vs. Input Voltage
1.26
3.40
3.38
Output Voltage (V)
1.24
Output Voltage (V)
10
Output Voltage vs. Output Current
1.28
Output Voltage (V)
Output Voltage (V)
0.1
Output Current (A)
IOUT = 0A
1.22
1.20
1.18
IOUT = 2A
1.16
IOUT = 0A
3.36
3.34
3.32
IOUT = 2A
3.30
3.28
3.26
1.14
3.24
VIN = 2.5V to 5.5V, V OUT = 1.2V
1.12
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
8
5.5
VIN = 4.5V to 5.5V, V OUT = 3.3V
3.22
4.5
4.6
4.7
4.8
4.9
5
5.1
5.2
5.3
5.4
5.5
Input Voltage (V)
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Reference Voltage vs. Input Voltage
Switching Frequency vs. Input Voltage
1.5
0.64
1.4
Switcing Frequency (MHz)1
0.65
Reference Voltage (V)
0.63
0.62
0.61
0.60
0.59
0.58
0.57
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.56
0.6
0.55
0.5
2.5
3
3.5
4
4.5
5
IOUT = 0.6A, Valley Current
2.5
5.5
3
3.5
4.5
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
5
5.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
VEN = 0V
VEN = 0V
0.0
0.0
2.5
3
3.5
4
4.5
5
-50
5.5
-25
0
Quiescent Current vs. Input Voltage
50
75
100
125
Quiescent Current vs. Temperature
400
340
380
Quiescent Current (µA)
350
330
320
310
300
290
280
270
260
25
Temperature (°C)
Input Voltage (V)
Quiescent Current (μA)
4.5
Shutdown Currrent vs. Temperature
5.0
Shutdown Current (μA)1
Shutdown Current (µA)1
Shutdown Current vs. Input Voltage
5.0
0.5
4
Input Voltage (V)
Input Voltage (V)
VFB = 0.63V, LX no switch
360
VIN = 5V
340
320
VIN = 3.3V
300
280
260
240
220
200
250
2.5
3
3.5
4
4.5
5
Input Voltage (V)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
5.5
-50
-25
0
25
50
75
100
125
Temperature (°C)
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
9
RT8097B
Inductor Current Limit vs. Temperature
5
4
4
Inductor Current (A)
Inductor Current (A)
Inductor Current Limit vs. Input Voltage
5
3
2
1
3
2
1
VOUT = 1.2V, Valley Current
VOUT = 1.2V, Valley Current
0
0
2.5
3
3.5
4
4.5
5
5.5
-50
-25
0
Input Voltage (V)
UVLO vs. Temperature
50
75
100
125
Enable Voltage vs. Temperature
2.5
1.4
2.4
1.2
Enable Voltage (V)
2.3
Input Voltage (V)
25
Temperature (°C)
Turn On
2.2
2.1
2.0
1.9
Turn Off
1.8
1.0
Enable On
0.8
Enable Off
0.6
0.4
1.7
0.2
1.6
VIN = 3.3V
VEN = 3.3V
1.5
0.0
-50
-25
0
25
50
75
100
125
-50
Temperature (°C)
VOUT
(50mV/Div)
IOUT
(1A/Div)
IOUT
(1A/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
10
25
50
75
100
125
Load Transient Response
VOUT
(50mV/Div)
Time (100μs/Div)
0
Temperature (°C)
Load Transient Response
VIN = 3.3V, VOUT = 1.2V, IOUT = 0A to 2A
-25
VIN = 3.3V, VOUT = 1.2V, IOUT = 1A to 2A
Time (100μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Voltage Ripple
Voltage Ripple
VIN = 3.3V, VOUT = 1.2V, IOUT = 1A
VIN = 5V, VOUT = 3.3V, IOUT = 1A
VOUT
VOUT
(10mV/Div)
(10mV/Div)
VLX
(2V/Div)
VLX
(2V/Div)
Time (1μs/Div)
Time (1μs/Div)
Power On from EN
Power Off from EN
VEN
(2V/Div)
VEN
(2V/Div)
VPGOOD
(2V/Div)
VPGOOD
(2V/Div)
VOUT
VOUT
(1V/Div)
(1V/Div)
IOUT
IOUT
(1A/Div)
(1A/Div)
VIN = 3.3V, VOUT = 1.2V, IOUT = 0A
VIN = 3.3V, VOUT = 1.2V, IOUT = 0A
Time (500μs/Div)
Time (10ms/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
RT8097B
Application Information
The RT8097B is a single-phase step-down converter. It
provides single feedback loop constant on-time, current
mode control with fast transient response. An internal
0.6V reference allows the output voltage to be precisely
regulated for low output voltage applications. A fixed
switching frequency (1MHz) oscillator and internal
compensation are integrated to minimize external
component count. Protection features include over
current protection, under voltage protection and over
temperature protection.
Output Voltage Setting
Connect a resistive voltage divider at the FB between
VOUT and GND to adjust the output voltage. The output
voltage is set according to the following equation :

VOUT = VREF  1  R1
R2

where VREF is the feedback reference voltage 0.6V
(typ.).
During soft-start, the internal soft-start capacitor
becomes charged and generates a linear ramping up
voltage across the capacitor. This voltage clamps the
voltage at the FB pin, causing PWM pulse width to
increase slowly and in turn reduce the input surge
current. The internal 0.6V reference takes over the loop
control once the internal ramping-up voltage becomes
higher than 0.6V.
UVLO Protection
The RT8097BL has input Under Voltage Lockout
protection (UVLO). If the input voltage exceeds the
UVLO rising threshold voltage (2.25V typ.), the
converter resets and prepares the PWM for operation.
If the input voltage falls below the UVLO falling
threshold voltage during normal operation, the device
will stop switching. The UVLO rising and falling
threshold voltage has a hysteresis to prevent noisecaused reset.
Input Capacitor Selection
VOUT
R1
FB
R2
GND
Figure 1. Setting VOUT with a Voltage Divider
High quality ceramic input decoupling capacitor, such
as X5R or X7R, with values greater than 22F are
recommended for the input capacitor. The X5R and
X7R ceramic capacitors are usually selected for power
regulator capacitors because the dielectric material has
less capacitance variation and more temperature
stability.
Voltage rating and current rating are the key parameters
Chip Enable and Disable
The EN pin allows for power sequencing between the
controller bias voltage and another voltage rail. The
RT8097B remains in shutdown if the EN pin is lower
than 400mV. When the EN pin rises above the VEN trip
point, the RT8097B begins a new initialization and softstart cycle.
Internal Soft-Start
The RT8097B provides an internal soft-start function to
prevent large inrush current and output voltage
overshoot when the converter starts up. The soft-start
(SS) automatically begins once the chip is enabled.
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
12
when selecting an input capacitor. Generally, selecting
an input capacitor with voltage rating 1.5 times greater
than the maximum input voltage is a conservatively safe
design.
The input capacitor is used to supply the input RMS
current, which can be approximately calculated using
the following equation :
IIN_RMS = ILOAD  VOUT   1  VOUT 
VIN 
VIN 
The next step is selecting a proper capacitor for RMS
current rating. One good design uses more than one
capacitor with low equivalent series resistance (ESR) in
parallel to form a capacitor bank.
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
The input capacitance value determines the input ripple
voltage of the regulator. The input voltage ripple can be
approximately calculated using the following equation :
VIN
IOUT(MAX) VOUT 
=

 1  VOUT 
CIN  fSW
VIN 
VIN 
Output Capacitor Selection
The output capacitor and the inductor form a low pass
filter in the Buck topology. In steady state condition, the
ripple current flowing into/out of the capacitor results in
ripple voltage. The output voltage ripple (VP-P) can be
calculated by the following equation :
1

VP_P = LIR  ILOAD(MAX)   ESR +
8  COUT  fSW 

When load transient occurs, the output capacitor
supplies the load current before the controller can
respond. Therefore, the ESR will dominate the output
voltage sag during load transient. The output voltage
undershoot (VSAG) can be calculated by the following
equation :
VSAG = ILOAD  ESR
For a given output voltage sag specification, the ESR
value can be determined.
Another parameter that has influence on the output
voltage sag is the equivalent series inductance (ESL).
The rapid change in load current results in di/dt during
transient. Therefore, the ESL contributes to part of the
voltage sag. Using a capacitor with low ESL can obtain
better transient performance. Generally, using several
capacitors connected in parallel can have better
transient performance than using a single capacitor for
the same total ESR.
must be large enough not to saturate at the peak
inductor current (IPEAK) :
IPEAK = ILOAD(MAX) +  LIR  ILOAD(MAX) 
 2

The calculation above serves as a general reference.
To further improve transient response, the output
inductor can be further reduced. This relation should be
considered along with the selection of the output
capacitor.
Inductor saturation current should be chosen over IC’s
current limit.
Thermal Considerations
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature.
The maximum power dissipation can be calculated by
the following formula :
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 recommended operating condition specifications,
the maximum junction temperature is 125C. The
junction to ambient thermal resistance, JA, is layout
dependent. For SOT-23-5 package, the thermal
resistance, JA, is 218.1C/W on a standard four-layer
thermal test board. For SOT-23-6 package, the thermal
resistance, JA, is 208.2C/W on a standard four-layer
thermal test board. The maximum power dissipation at
TA = 25C can be calculated by the following formula :
Inductor Selection
PD(MAX) = (125C  25C) / (218.1C/W) = 0.45W for
The switching frequency (on-time) and operating point
(% ripple or LIR) determine the inductor value as shown
below :
SOT-23-5 package
L=
VOUT   VIN  VOUT 
fSW  LIR  ILOAD(MAX)  VIN
where LIR is the ratio of the peak-to-peak ripple current
to the average inductor current.
Find a low loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. The core
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
PD(MAX) = (125C  25C) / (208.2C/W) = 0.48W for
SOT-23-6 package
The maximum power dissipation depends on the
operating ambient temperature for fixed TJ(MAX) and
thermal resistance, JA. The derating curve in Figure 2
allows the designer to see the effect of rising ambient
temperature on the maximum power dissipation.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
13
RT8097B
Maximum Power Dissipation (W)1
1.0
Four-Layer PCB
0.9
0.8
0.7
0.6
SOT-23-6
0.5
0.4
SOT-23-5
0.3
0.2
0.1
0.0
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 2. Derating Curve of Maximum Power
Dissipation
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
14
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015
RT8097B
Outline Dimension
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
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS8097B-02
October
2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
15
RT8097B
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.889
1.295
0.031
0.051
A1
0.000
0.152
0.000
0.006
B
1.397
1.803
0.055
0.071
b
0.250
0.560
0.010
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-23-6 Surface Mount Package
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 © 2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
16
is a registered trademark of Richtek Technology Corporation.
DS8097B-02
October
2015