®
RT8130B
12V High Efficiency Synchronous Buck PWM Controller
General Description
The RT8130B is a high efficiency single phase
synchronous Buck DC/DC controller with 5V/12V supply
voltage.
The RT8130B has embedded MOSFET gate driver with
high driving capability, supporting driving voltage up to 12V
for high output current application. This device uses
lossless low-side MOSFET R
DS(ON)
current sense
technique for over-current protection with adjustable
threshold set by the LGATE pin (LGOCS). Other features
include power good indication, enable/disable control and
internal soft-start. The RT8130B also provides fault
protection functions to protect the power stage output.
With above functions, the IC provides customers a cost-
effective solution for high efficiency power conversion. The
RT8130B is available in the WDFN-10L 3x3 package.
Features
High Light Load Efficiency
Single 5V to 12V Driver Voltage
Integrated High Driving Capability N-MOSFET Gate
Drivers
300kHz Fixed Frequency Internal Oscillator
88% Maximum PWM Duty Cycle
Power Good Indicator
Enable/Disable Control
Internal Soft-Start
Lossless Low-Side MOSFET R
DS(ON)
Current Sensing
for Over-Current Fault Monitoring
LGATE Over-Current Setting (LGOCS)
OCP, UVP, OVP, OTP, UVLO
Ordering Information
RT8130B
Package Type
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Richtek products are :
½
Applications
Motherboard, Memory/Chip-set Power
Graphic Card, GPU/Memory Core Power
Low Voltage, High Current DC/DC Regulator
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.
½
Simplified Application Circuit
V
IN
RT8130B
BOOT
V
CC
VCC
UGATE
V
PGOOD
PGOOD
COMP/EN
EN
GND
FB
PHASE
LGATE
V
OUT
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8130B-02 January 2016
www.richtek.com
1
RT8130B
Pin Configurations
(TOP VIEW)
BOOT
PHASE
UGATE
LGATE
GND
GND
1
2
3
4
5
10
9
8
7
6
Marking Information
8X= : Product Code
PGOOD
NC
FB
COMP/EN
VCC
8X=YM
DNN
YMDNN : Date Code
11
WDFN-10L 3x3
Functional Pin Description
Pin No.
1
Pin Name
BOOT
Pin Function
Bootstrap Supply for High-Side Gate Driver. Connect this pin to a power source
V
CC
through a bootstrap diode, and connect a 0.1F or greater ceramic
capacitor from this pin to the PHASE pin to supply the power for high-side gate
driver.
Switch Node. Connect this pin to the switching node of Buck converter. This pin
is also the floating drive return of the high-side MOSFET gate driver.
High-Side MOSFET Gate Driver Output. Connect this pin to the Gate of high-
side MOSFET for floating drive.
Low-Side MOSFET Gate Driver Output. Connect this pin to the Gate of low-side
MOSFET. This pin is also used for Over-Current Protection (OCP) threshold
setting. Connect a resistor (R
OCSET
) from this pin to the GND pin to set the OCP
threshold.
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Supply Voltage Input. It is recommended to connect a 1F or greater ceramic
capacitor from this pin to the GND pin. VCC also powers the low-side gate driver.
Compensation Node. Connect R-C network between this pin and the FB pin for
PWM control loop compensation. This pin is also used for enable/disable control.
Connect a small signal MOSFET to this pin to implement enable/disable control.
Feedback Voltage Input. This pin is used for output voltage feedback input and
it is also monitored for power good indication, over-voltage and under-voltage
protections. Connect this pin to the converter output through voltage divider
resistors for output voltage regulation.
No Internal Connection.
Power Good Indicator Output. This pin provides an open-drain output. Connect
this pin to a voltage source through a pull-up resistor. The PGOOD voltage goes
high to indicate the output voltage is in regulation. This pin can be left open if the
power good indication function is not used.
2
3
PHASE
UGATE
4
LGATE
5,
GND
11 (Exposed Pad)
6
VCC
7
COMP/EN
8
9
10
FB
NC
PGOOD
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS8130B-02 January 2016
RT8130B
Function Block Diagram
COMP/EN
VCC
Regulator
BOOT
UGATE
FB
V
REF
-
EA
+
+
CMP
-
UV_level
PWM
+
CMP
-
Control
Logic
+
-
PHASE
V
CC
I
OCSET
OC
Current
Sense & OCP
Comparator
V
REF
UV
OV
V
CC
LGATE
GND
-1
OV_level
PGH_level
PGL_level
-
+
+
-
-
+
PGOOD
Operation
The RT8130B is a high efficiency single-phase
synchronous Buck controller with integrated MOSFET
driver. The controller has a fixed frequency control, a fixed
frequency 300kHz oscillator is integrated to minimize
external components.
Enable
The RT8130B remains in shutdown if the COMP/EN pin
is lower than 0.3V (Max). When the COMP/EN pin rises
above the enable trip point, the RT8130B will begin a soft-
start cycle.
Over-Current Threshold Setting
Current limit threshold is externally programmed by adding
a resistor (R
OCSET
) between LGATE and GND. Once VCC
exceeds the POR threshold, an internal current source
I
OC
flows through R
OCSET
. The voltage across R
OCSET
is
stored as the current limit protection threshold. After that,
the current source is switched off.
Under-Voltage Protection
If the FB voltage is lower than the UVP threshold during
normal operation, UVP will be triggered. When the UVP
is triggered, both UGATE and LGATE go low until VCC is
resupplied and exceeds the POR rising threshold voltage.
Over-Voltage Protection
If the FB pin voltage is higher than the OVP threshold
during normal operation, OVP will be triggered. When OVP
is triggered, UGATE will go low and LGATE will go high
until VCC is resupplied and exceeds the POR rising
threshold voltage.
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8130B-02 January 2016
www.richtek.com
3
RT8130B
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VCC ------------------------------------------------------------------------------------------------------- 15V
BOOT to PHASE ------------------------------------------------------------------------------------------------------------ 15V
PGOOD ------------------------------------------------------------------------------------------------------------------------ 15V
Input, Output or I/O Voltage -----------------------------------------------------------------------------------------------
−0.3V
to 7V
PHASE to GND
DC -------------------------------------------------------------------------------------------------------------------------------
−5V
to 25V
< 100ns ------------------------------------------------------------------------------------------------------------------------
−10V
to 30V
BOOT to GND
DC -------------------------------------------------------------------------------------------------------------------------------
−0.3V
to 40V
< 100ns ------------------------------------------------------------------------------------------------------------------------
−0.3V
to 45V
UGATE to GND
DC -------------------------------------------------------------------------------------------------------------------------------
−0.3V
to 40V
< 100ns ------------------------------------------------------------------------------------------------------------------------
−10V
to 45V
UGATE to PHASE
DC -------------------------------------------------------------------------------------------------------------------------------
−0.3V
to 15V
< 100ns ------------------------------------------------------------------------------------------------------------------------
−5V
to 20V
LGATE to GND
DC -------------------------------------------------------------------------------------------------------------------------------
−0.3V
to 15V
< 100ns ------------------------------------------------------------------------------------------------------------------------
−5V
to 20V
Power Dissipation, P
D
@ T
A
= 25°C (Note 2)
WDFN-10L 3x3 --------------------------------------------------------------------------------------------------------------- 3.27W
Package Thermal Resistance
WDFN-10L 3x3,
θ
JA
--------------------------------------------------------------------------------------------------------- 30.5°C/W
WDFN-10L 3x3,
θ
JC
--------------------------------------------------------------------------------------------------------- 7.5°C/W
Junction Temperature ------------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C
Storage Temperature Range ----------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ------------------------------------------------------------------------------------------------ 2kV
Recommended Operating Conditions
(Note 4)
Power Input Voltage, VIN -------------------------------------------------------------------------------------------------- 2.5V to 21V
Supply Input Voltage, VCC ------------------------------------------------------------------------------------------------ 4.5V to 13.2V
Junction Temperature Range ----------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ----------------------------------------------------------------------------------------------
−40°C
to 85°C
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS8130B-02 January 2016
RT8130B
Electrical Characteristics
(V
CC
= 12V, T
A
= 25°C, unless otherwise specified)
Parameter
General
Supply Input Voltage
VCC Supply Current
VCC POR Threshold
VCC POR Hysteresis
Soft-Start Interval
Reference Voltage
Protection
Thermal Shutdown Limit
Over-Voltage Threshold
Under-Voltage Threshold
OC Current Source
OC Preset Trigger Voltage
Symbol
Test Conditions
Min
Typ
Max
Unit
V
CC
I
CC
V
PORH
V
RORL
t
SS
V
REF
T
SD
V
OVP
V
UVP
I
OC
V
OC_Preset
R
OCSET
is Not Populated
From V
CC
> 4.5V to Soft-Start
V
BOOT
– V
PHASE
= 12V, Max
Source Current
V
LGATE
= 12V, Max Source
Current
V
UGATE
– V
PHASE
= 0.1V
V
LGATE
= 0.1V
Relative to FB Voltage
Relative to FB Voltage
No Load for UGATE/ LGATE
V
CC
Rising
V
CC
Falling
V
FB
from 0V to 0.8V
4.5
--
--
3.6
--
3
0.793
--
115
--
9
--
--
12
2
4.1
3.8
0.3
--
0.8
165
125
75
10
0.6
--
13.2
--
4.2
--
--
7
0.807
--
135
--
11
--
5
V
mA
V
V
ms
V
C
%
%
A
V
ms
Over Current Setting Time Delay t
OCP
MOSFET Gate Driver
UGATE Drive Source
LGATE Drive Source
UGATE Drive Sink
LGATE Drive Sink
Dead Time
PWM Controller
EA Open Loop Gain
EA Bandwidth
Maximum Duty
Ramp Valley
Ramp Amplitude
COMP/EN Disable Threshold
PWM Frequency
PGOOD Threshold
PGOOD Low Level
EN to Soft-Start Delay
f
OSC
V
PGOOD_H
V
PGOOD_L
V
OSC
G
EA
BW
D
MAX
I
UGATEsr
I
LGATEsr
R
UGATEsk
R
LGATEsk
t
DEAD
--
--
--
--
--
1.5
1.5
1.8
1.2
30
--
--
--
--
--
A
A
ns
(Note 5)
(Note 5)
--
--
--
--
80
15
88
0.9
1.6
--
300
0.89
0.71
--
--
--
--
--
--
--
0.3
330
0.92
0.74
0.4
500
dB
MHz
%
V
V
V
kHz
V
V
s
V
IN
= 12V
--
--
270
Relative to FB Voltage
Relative to FB Voltage
0.86
0.68
--
--
V
OL_PGOOD
Sink Current = 4mA
t
DELAY_EN
(Note 5)
Copyright
©
2016 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8130B-02 January 2016
www.richtek.com
5
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