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RT6150A/B
Current Mode Buck-Boost Converter
General Description
The RT6150A/B is a high efficiency, fixed frequency, Buck-
Boost DC-DC converter that operates from input voltages
above, below or equal to the output voltage. The topology
incorporated in the IC provides a continuous transfer
function through all operating modes, making the product
ideal for single lithium-ion, multi-cell alkaline or Ni-MH
battery applications where the output voltage is within the
battery voltage range.
The device includes two N-MOSFET switches and two P-
MOSFET switches for high efficiency operation. Switching
frequency is set at 1MHz to reduce the external
component size. Quiescent current is only 60μA in Power
Save Mode (PSM), maximizing battery life in portable
applications. PSM operation is user controlled and can
be enabled by driving the PS pin low. If the PS pin is
driven high, then fixed frequency switching is enabled.
Other features include low shutdown current, internal
soft-start control, thermal shutdown protection and current
limit. The RT6150A is available in the WDFN-10L 3x3
package and the RT6150B is available in the WDFN-10L
2.5x2.5 package.
Features
Single Inductor
Fixed Frequency Operation with Battery Voltages
Synchronous Rectification : Up to 90% Efficiency
Up to 800mA Continuous Output Current
VOUT Disconnected from VIN during Shutdown
Power Save Mode (PSM) Enable Control
<1μA Shutdown Current
μ
Input Voltage Range: 1.8V to 5.5V
Fixed
3.3V and Adjustable Output Voltage Options
from 2.5V to 5.5V
10-Lead WDFN Packages
RoHS Compliant and Halogen Free
Ordering Information
RT6150A/B-
Package Type
QW : WDFN-10L 3x3 (W-Type)
QW : WDFN-10L 2.5x2.5 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
33 : 3.3V (Only for RT6150B)
A : WDFN-10L 3x3
B : WDFN-10L 2.5x2.5
Note :
Richtek products are :
½
Applications
Portable Products
Handheld Instrumentation
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
LX1
Battery
LX2
V
OUT
R1
FB
Enable
EN
PS
GND
R2
RT6150A/B
VOUT
VIN
VINA
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6150A/B-06 July 2018
www.richtek.com
1
RT6150A/B
Marking Information
RT6150AGQW
0N= : Product Code
YMDNN : Date Code
VOUT
LX2
GND
LX1
VIN
Pin Configuration
(TOP VIEW)
GND
1
2
3
4
5
10
9
8
7
6
0N=YM
DNN
11
FB
GND
VINA
PS
EN
WDFN-10L 3x3 / WDFN-10L 2.5x2.5
RT6150BGQW
00 : Product Code
W : Date Code
00W
RT6150B-33GQW
03 : Product Code
03W
W : Date Code
Functional Pin Description
Pin No.
1
2
3, 9,
11 (Exposed Pad)
4
5
6
7
8
10
Pin Name
VOUT
LX2
GND
LX1
VIN
EN
PS
VINA
FB
Pin Function
Output of the buck-boost converter. Connect a capacitor between the VOUT
and GND.
Second switch node. Connect this pin to the inductor.
Power ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
First switch node. Connect this pin to the inductor.
Power input. Connect an at least 10F capacitor between the VIN pin and
GND.
Enable control input for the buck-boost converter.
PSM control input. Pull low for PSM operation and pull high for fixed
switching frequency operation.
Supply voltage input for control circuit.
Feedback input. For adjustable versions, connect a resistive divider to set
the output voltage and it can be adjusted from 2.5V to 5.5V; For fixed
version, must be connected to VOUT.
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6150A/B-06 July 2018
RT6150A/B
Functional Block Diagram
LX1
LX2
VIN
VOUT
Gate Driver
VINA
ISENSE
Temp
Control
PS
EN
OSC
CMP
SS
AMP
C
C
R
C
-
+
OCP
OTP
CTRL
Zero Current
V
PSM
V
REF
FB
+
+
Slop Comp
GND
Operation
The RT6150A/B is a synchronous average current mode switching Buck-Boost converter designed to maintain a fixed
output voltage from an input supply that can be above, equal, or below the output voltage. The average inductor current
is regulated by a fast current regulator which is controlled by a voltage control loop. The voltage error amplifier gets its
feedback input from the FB pin. For adjustable output voltage, a resistive voltage divider must be connected to the FB
pin. When VIN is greater than VOUT, the device operates in Buck mode. When VIN is lower than VOUT, the device
operates in Boost mode. When VIN is close to VOUT, the RT6150A/B automatically enters Buck-Boost mode. In Buck-
Boost mode, the converter will maintain the regulation for output voltage and keep a minimum current ripple in the
inductor to guarantee good performance.
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6150A/B-06 July 2018
www.richtek.com
3
RT6150A/B
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6V
−0.3V
to 6V
−2V
to 7.5V
3.28W
VOUT, VIN, EN, PS, VINA, FB Pin ------------------------------------------------------------------------------------
Switch Output Voltage, LX1, LX2 Pin ----------------------------------------------------------------------------------
< 10ns -------------------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WDFN-10 3x3 ---------------------------------------------------------------------------------------------------------------
WDFN-10 2.5x2.5 ---------------------------------------------------------------------------------------------------------- 2.44W
Package Thermal Resistance (Note 2)
WDFN-10 3x3,
θ
JA
---------------------------------------------------------------------------------------------------------- 30.5°C/W
WDFN-10 3x3,
θ
JC
---------------------------------------------------------------------------------------------------------
WDFN-10 2.5x2.5,
θ
JA
-----------------------------------------------------------------------------------------------------
WDFN-10 2.5x2.5,
θ
JC
----------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------
7.5°C/W
40.9°C/W
18.6°C/W
260°C
Junction Temperature ------------------------------------------------------------------------------------------------------ 150°C
Storage Temperature Range ---------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, VIN ------------------------------------------------------------------------------------------------ 1.8V to 5.5V
Junction Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= V
OUT
= 3.6V, T
A
= 25° C, unless otherwise specified.)
Parameter
Input Voltage
UVLO
High-Level
Low-Level
Symbol
Test Conditions
Min
--
1.4
Typ
1.65
1.55
0.5
1
60
0.1
0.1
0.1
0.15
0.15
--
1
0.65
Max
1.8
--
0.505
50
--
Unit
V
V
nA
A
Feedback Voltage
Feedback Input Current
V
FB
V
PS
= V
IN
V
FB
= 0.5V
I
OUT
= 0mA, PS = 0V
Power Save Mode
(Note 5)
0.495
--
--
--
--
--
Quiescent Current
EN = 0V, not including switch
leakage shutdown
1
5
10
--
--
--
1.2
1
A
A
A
MHz
ms
N-MOSFET Switch Leakage
P-MOSFET Switch Leakage
N-MOSFET Switch On
Resistance
P-MOSFET Switch On
Resistance
Switch Current Limit
Oscillator Frequency
Soft-Start Time
R
DS(ON)_N
R
DS(ON)_P
I
LIM
f
OSC
t
SS
Time from when EN signal asserts
to output voltage I
OUT
= 0mA
V
IN
= 3.6V
--
--
1.6
0.8
--
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS6150A/B-06 July 2018
RT6150A/B
Parameter
EN and PS Input
Voltage
Thermal Shutdown
Logic-High
Logic-Low
V
EN
= V
PS
= V
IN
T
SD
Symbol
Test Conditions
Min
1.2
--
--
--
Typ
--
--
0.01
140
Max
--
0.4
1
--
Unit
V
A
C
EN and PS Input Current
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.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
θ
JC
is
measured at the exposed pad of the package.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
Current measurements are performed when the output are not switching.
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6150A/B-06 July 2018
www.richtek.com
5
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