Rev 1.1
DIO6930
High-Efficiency 3A, 24V Input Synchronous
Step Down Converter
Features
Descriptions
Low RDS(ON) for internal switches (top/bottom)
The DIO6930 is high-efficiency, high frequency
80mΩ/40mΩ, 3.0A
synchronous step-down DC-DC regulator ICs
4.5-24V input voltage range
capable of delivering up to 3A output currents.
High-Efficiency Synchronous-Mode
The DIO6930 family operate over a wide input
Internal soft start limits the inrush current
voltage range from 4.5V to 24V and integrate main
Over Current protection
switch and synchronous switch with very low
Thermal shutdown
RDS(ON) to minimize the conduction loss.
Available in TSOT23-6 packages
The COT architecture with Pseudo fixed switching
frequency
operation
provides
fast
transient
response and eases loop stabilization. Protection
features include over-current protection and
thermal shutdown.
The DIO6930 requires a minimal number of
readily-available, standard, external components
and is available in a space-saving TSOT23-6
package.
Applications
Function Block
Portable Navigation Device
Set Top Box
Portable TV
LCD TV
Ordering Information
Order Part
Number
DIO6930TST6
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Top Marking
30YW
TA
Green
-40 to +85°C
Package
TSOT23-6
Tape & Reel, 3000
© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
DIO6930
TSOT23-6
Figure 1 Pin Assignment (Top View)
Pin Definitions
Pin Name
GND
Description
Power Ground
SW
Inductor pin. Connect this pin to the switching node of inductor.
VIN
Power Input
Output Feedback Pin. Connect this pin to the center point of the output resistor divider
FB
(as shown in Figure 1) to program the output voltage:
VOUT=0.765*(1+R1/R2).Add optional C2 (10pF~47pF) to speed up the transient response.
EN
Enable control. Pull high to turn on. Do not float.
Bootstrap. Connect a capacitor and a resistor between SW and BS pins to form a floating supply
BS
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across the high-side switch driver. Recommend to use 0.1µF BS capacitor.
© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Pin Assignments
DIO6930
Stresses beyond those listed under “Absolute Maximum Rating” may cause permanent damage to the device. These are stress
ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections
of the specifications is not implied. Exposure to absolute maxim rating conditions for extended periods may affect device reliability.
Parameter
Rating
Unit
28
V
VIN+0.3
V
FB Voltage
6
V
BS Voltage
SW+6
V
Supply Voltage (V+ – V-)
EN, SW Voltage
ӨJA
87.9
ӨJC
42.2
Package Thermal Resistance
°C/W
Storage Temperature Range
-65 to 150
°C
Junction Temperature Range
125
°C
Lead Temperature Range
260
°C
Recommend Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended Operating
conditions are specified to ensure optimal performance to the datasheet specifications. DIOO does not Recommend exceeding
them or designing to Absolute Maximum Ratings.
Parameter
Rating
Unit
Supply Voltage
4.5 to 24
V
Junction Temperature Range
-40 to 125
°C
Ambient Temperature Range
-40 to 85
°C
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© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Absolute Maximum Ratings
DIO6930
VIN = 12V, VOUT = 1.2V, L = 2.2µH, COUT = 47µF, TA = 25°C, IOUT=1A unless otherwise specified.
Symbol
Parameter
Test Conditions
VIN
Input Voltage Range
IQ
Quiescent Current
IOUT=0, VFB=VREF⋅105%
ISHDN
Shutdown Current
EN=0
VREF
Feedback Reference Voltage
IFB
FB Input Current
Min
Typ
4.5
Unit
24
V
140
0.758
VFB=3.3V
Max
µA
5
10
µA
0.765
0.772
V
50
nA
-50
RDS(ON)
Top FET RON
80
mΩ
RDS(ON)
Bottom FET RON
40
mΩ
4.0
A
ILIM
Low side power FET current limit
3.0
VENH
EN Rising Threshold
1.5
VENL
EN Falling Threshold
VUVLO
fSW
V
VIN Under-Voltage Unlock
Threshold, Rising
0.4
V
4.45
V
Switching Frequency
500
kHz
Min ON Time
40
ns
Min OFF Time
180
ns
TSS
Soft Start Time
1
ms
TSD
Thermal Shutdown Temperature
148
°C
THYS
Thermal Shutdown Hysteresis
20
°C
Specifications subject to change without notice.
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© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Electrical Characteristics
DIO6930
Typical Performance Characteristics
Start up from VIN
(VIN=12V,VOUT=3.3V,Load=1Ω)
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Shut down from VIN
(VIN=12V,VOUT=3.3V,Load=1Ω)
Start up from Enable
Shut down from Enable
(VIN=12V,VOUT=3.3V,Load=1Ω)
(VIN=12V,VOUT=3.3V,Load=1Ω)
© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Typical Application
DIO6930
(VIN=12V,VOUT=3.3V,Load=0.3-3A)
Ripple
(VIN=12V,VOUT=3.3V,Load=0A)
Short Circuit Protection
(VIN=12V,VOUT=3.3V,Load=3A)
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Load transient
(VIN=12V,VOUT=3.3V,Load=1.5-3A)
Ripple
(VIN=12V,VOUT=3.3V,Load=3A)
Short Circuit Recovery
(VIN=12V,VOUT=3.3V,Load=3A)
© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Load transient
DIO6930
DIO6930 is a synchronous buck regulator IC that integrates the COT control, top and bottom switches on the
same die to minimize the switching transition loss and conduction loss. With ultra low RDS(ON) power switches
and proprietary COT control, this regulator IC can achieve the highest efficiency and the highest switch
frequency simultaneously to minimize the external inductor and capacitor size, and thus achieving the
minimum solution footprint.
Because of the high integration in the DIO6930 IC, the application circuit based on this regulator IC is rather
simple. Only input capacitor CIN, output capacitor COUT, output inductor L and feedback resistors (R1 and R2)
need to be selected for the targeted applications specifications.
Feedback resistor dividers R1 and R2
Choose R1 and R2 to program the proper output voltage. To minimize the power consumption under light
loads, it is desirable to choose large resistance values for both R1 and R2. A value of between 10k and 1M is
highly recommended for both resistors. If Vout is 3.3V, R1=40.2k is chosen, then R2 can be calculated to be
12k.
R2=
0.765V
R1
VOUT − 0.765V
Input capacitor CIN
This ripple current through input capacitor is calculated as:
ICIN_RMS=IOUT ⋅
D(1 − D)
This formula has a maximum at VIN=2VOUT condition, where ICIN_RMS=IOUT/2. This simple worst-case condition is
commonly used for DC/DC design.
To minimize the potential noise problem, place a typical X5R or better grade ceramic capacitor really close to
the IN and GND pins. Care should be taken to minimize the loop area formed by CIN, and IN/GND pins. In this
case, a 10µF low ESR ceramic capacitor is recommended.
Output capacitor COUT
The output capacitor is selected to handle the output ripple noise requirements. Both steady state ripple and
transient requirements must be taken into consideration when selecting this capacitor. For the best
performance, it is recommended to use X5R or better grade ceramic capacitor greater than 22µF capacitance.
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© 2018 DIOO MICROCIRCUITS CO., LTD
DIO6930• V1.1
High-Efficiency 3A, 24V Input Synchronous Step Down Converter
Application Information
DIO6930
There are several considerations in choosing this inductor.
1) Choose the inductance to provide the desired ripple current. It is suggested to choose the ripple current to
be about 40% of the maximum output current. The inductance is calculated as:
L=
VOUT (1 − VOUT / VIN , MAX )
FSW × IOUT , MAX × 40%
where Fsw is the switching frequency and IOUT,MAX is the maximum load current. The DIO6930 regulator IC is
quite tolerant of different ripple current amplitude. Consequently, the final choice of inductance can be
slightly off the calculation value without significantly impacting the performance.
2) The saturation current rating of the inductor must be selected to be greater than the peak inductor current
under full load conditions.
ISAT,MIN>IOUT,MAX +
VOUT (1 − VOUT / VIN , MAX )
2 ⋅ FSW ⋅ L
3) The DCR of the inductor and the core loss at the switching frequency must be low enough to achieve the
desired efficiency requirement. It is desirable to choose an inductor with DCR
