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RT7231/32/33/34
4A, 18V, 650kHz, ACOT® Synchronous Step-Down Converter
General Description
Features
The RT7231/32/33/34 is a synchronous step-down DC/
DC converter with Advanced Constant On-Time (ACOT®)
mode control. It achieves high power density to deliver up
to 4A output current from a 4.5V to 18V input supply. The
proprietary ACOT® mode offers an optimal transient
response over a wide range of loads and all kinds of ceramic
capacitors, which allows the device to adopt very low ESR
output capacitor for ensuring performance stabilization. In
addition, RT7231/32/33/34 keeps an excellent constant
switching frequency under line and load variation and the
integrated synchronous power switches with the ACOT®
mode operation provides high efficiency in whole output
current load range. Cycle-by-cycle current limit provides
an accurate protection by a valley detection of low side
MOSFET and external soft-start setting eliminates input
current surge during startup. Protection functions include
thermal shutdown for RT7231/32/33/34, output Under
Voltage Protection (UVP) / Over Voltage Protection (OVP)
for RT7231/32. When the UVP/OVP is triggered, the device
will enter latch mode for TSSOP-14 (Exposed Pad), and
hiccup mode for WDFN-10L 3x3.
The RT7231/32 are available in TSSOP-14 (Exposed Pad)
and WDFN-10L 3x3 packages, and the RT7231 is operated
in forced continuous conduction mode.
The RT7233/34 are available in the SOP-8 (Exposed Pad)
package, and the RT7233 is operated in forced continuous
conduction mode.
ACOT® Mode Enables Fast Transient Response
4.5V to 18V Input Voltage Range
4A Output Current
50mΩ
Ω Internal Low Site N-MOSFET
Advanced Constant On-Time Control
Support All Ceramic Capacitors
Up to 95% Efficiency
650kHz Switching Frequency at all Load Current
(RT7231, RT7233)
Discontinuous Operating Mode at Light Load
(RT7232, RT7234)
Adjustable Output Voltage from 0.765V to 8V
Adjustable Soft-Start
Cycle-by-Cycle Current Limit
Input Under Voltage Lockout
Thermal Shutdown
RoHS Compliant and Halogen Free
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Simplified Application Circuit
RT7231/32/33/34
VIN
Enable
Power GOOD
* : VCC pin for TSSOP-14 (Exposed Pad) only.
VIN
SW
VCC*
BOOT
EN
PGOOD*
PGND
VREG5
SS
GND*
VOUT
FB
VS*
VS pin for TSSOP-14 (Exposed Pad) only.
GND pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Copyright © 2022 Richtek Technology Corporation. All rights reserved.
DS7231/32/33/34-11
January 2022
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
RT7231/32/33/34
Ordering Information
Marking Information
Continuous Switching Mode
RT7231GCP
RT7231GCP : Product Code
RT7231
RT7231
GCPYMDNN
Package Type
CP : TSSOP-14 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
YMDNN : Date Code
RT7231GQW
1Q= : Product Code
1Q=YM
DNN
RT7233
YMDNN : Date Code
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT7233GSP
RT7233GSP : Product Code
RT7233
GSPYMDNN
YMDNN : Date Code
Discontinuous Operating Mode
RT7232
RT7232GCP
Package Type
CP : TSSOP-14 (Exposed Pad)
QW : WDFN-10L 3x3 (W-Type)
RT7232GCP : Product Code
RT7232
GCPYMDNN
YMDNN : Date Code
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT7232GQW
RT7234
1P= : Product Code
1P=YM
DNN
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
YMDNN : Date Code
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT7234GSP
Note :
RT7234GSP : Product Code
RT7234
GSPYMDNN
Richtek products are :
RoHS compliant and compatible with the current require-
YMDNN : Date Code
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Pin Configuration
14
2
13
12
3
4
PGND
11
5
10
6
9
7
15
8
VCC
VIN
BOOT
SW
SW
PGND
PGND
EN
FB
VREG5
SS
PGOOD
TSSOP-14 (Exposed Pad)
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2
1
2
3
4
5
11
10
9
8
7
9
VS
FB
VREG5
SS
GND
PGOOD
EN
PGND
(TOP VIEW)
VIN
VIN
BOOT
SW
SW
WDFN-10L 3x3
8
EN
FB
2
VREG5
3
SS
4
PGND
VIN
7
BOOT
6
SW
5
PGND
9
SOP-8 (Exposed Pad)
is a registered trademark of Richtek Technology Corporation.
DS7231/32/33/34-11
January 2022
RT7231/32/33/34
Functional Pin Description
Pin No.
Pin Name
TSSOP-14
SOP-8
WDFN-10L 3x3
(Exposed Pad)
(Exposed Pad)
1
--
--
Pin Function
VS
Output Voltage Sense Input.
2
2
2
FB
Feedback Voltage Input. It is used to regulate the
output of the converter to a set value via an external
resistive voltage divider. The feedback threshold
voltage is 0.765V typically.
3
3
3
VREG5
Internal Regulator Output. Connect a 1F capacitor
to GND to stabilize output voltage.
4
4
4
SS
Soft-Start Time Setting. Connect an external capacitor
between this pin and GND to set the soft- start time.
5
--
--
GND
Analog Ground.
6
5
--
PGOOD
Open Drain Power Good Indicator Output.
7
1
1
EN
Enable Control Input. A logic-high enables the
converter; a logic-low forces the IC into shutdown
mode reducing the supply current to less than 10A.
8, 9, 15
11
5, 9
PGND
(Exposed pad) (Exposed pad) (Exposed Pad)
Power Ground. The exposed pad must be soldered
to a large PCB and connected to PGND for
maximum power dissipation.
10, 11
6, 7
6
SW
Switch Node. Connect this pin to an external L-C
filter.
12
8
7
BOOT
Bootstrap Supply for High Side Gate Driver. Connect
a 0.1F capacitor between the BOOT and SW pin.
13
9, 10
8
VIN
Power Input. The input voltage range is from 4.5V to
18V. Must bypass with a suitably large (10F x 2)
ceramic capacitor.
14
--
--
VCC
Supply Voltage Input for Internal Linear Regulator to
the Control Circuitry.
Copyright © 2022 Richtek Technology Corporation. All rights reserved.
DS7231/32/33/34-11
January 2022
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RT7231/32/33/34
Functional Block Diagram
VCC*
EN
VREG5
POR &
Reg
BOOT
Min.
Off-Time
VBIAS
VREG5
VIN
VREF
OC
Control
Driver
SW
UV & OV
PGND
SW
VREG5
ZC
Ripple
Gen.
GND*
6µA
SS
VIN
FB
VS*
FB
+
Comparator
FB
0.9 x VREF
Comparator
-
PGOOD*
+
On-Time
* : VCC pin for TSSOP-14 (Exposed Pad) only.
GND pin for TSSOP-14 (Exposed Pad) only.
VS pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Operation
The RT7231/32/33/34 is a synchronous step-down
converter with advanced constant on-time control mode.
Using the ACOT® control mode can reduce the output
capacitance and provide fast transient response. It can
minimize the component size without additional external
compensation network.
Current Protection
The inductor current is monitored via the internal switches
in cycle-by-cycle. Once the output voltage drops under
UV threshold, the device will enter latch mode for TSSOP14 (Exposed Pad), and hiccup mode for WDFN-10L 3x3.
UVLO Protection
Power Good
(for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only)
After soft-start is finished, the power good function will be
activated. When the FB is activated, the PGOOD will
become an open-drain output. If the FB is below, the
PGOOD pin will be pulled low.
To protect the chip from operating at insufficient supply
voltage, the UVLO is needed. When the input voltage of
VCC is lower than the UVLO falling threshold voltage, the
device will be latch-off.
Output Discharge Control
(for TSSOP-14 (Exposed Pad) only)
Internal Regulator
The regulator provides 5V power to supply the internal
control circuit. Connecting a 1μF ceramic capacitor for
decoupling and stability is required.
When EN pin is low, the RT7231/32 will discharge the
output with an internal 50Ω MOSFET connected between
VOUT to GND pin.
Thermal Shutdown
Soft-Start
In order to prevent the converter output voltage from
overshooting during the startup period, the soft-start
function is necessary. The soft-start time is adjustable
and can be set by an external capacitor.
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When the junction temperature exceeds the OTP
threshold value, the IC will shut down the switching
operation. Once the junction temperature cools down and
is lower than the OTP lower threshold, the converter will
automatically resume switching
is a registered trademark of Richtek Technology Corporation.
DS7231/32/33/34-11
January 2022
RT7231/32/33/34
Absolute Maximum Ratings
(Note 1)
Supply Voltage, VIN, VCC --------------------------------------------------------------------------------------- −0.3V to 20V
Switch Voltage, SW ----------------------------------------------------------------------------------------------- −0.8V to (VIN + 0.3V)
< 10ns ---------------------------------------------------------------------------------------------------------------- −5V to 25V
BOOT to SW -------------------------------------------------------------------------------------------------------- −0.3V to 6V
EN ---------------------------------------------------------------------------------------------------------------------- −0.3V to 20V
Other Pins ------------------------------------------------------------------------------------------------------------ −0.3V to 6V
Power Dissipation, PD @ TA = 25°C
TSSOP-14 (Exposed Pad) --------------------------------------------------------------------------------------- 2.50W
WDFN-10L 3x3 ------------------------------------------------------------------------------------------------------ 1.67W
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------------- 2.174W
Package Thermal Resistance (Note 2)
TSSOP-14 (Exposed Pad), θJA --------------------------------------------------------------------------------- 40°C/W
WDFN-10L 3x3, θJA ------------------------------------------------------------------------------------------------ 60°C/W
WDFN-10L 3x3, θJC ------------------------------------------------------------------------------------------------ 7.5°C/W
SOP-8 (Exposed Pad), θJA --------------------------------------------------------------------------------------- 46°C/W
SOP-8 (Exposed Pad), θJC -------------------------------------------------------------------------------------- 7°C/W
Junction Temperature Range ------------------------------------------------------------------------------------- 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) ---------------------------------------------------------------------------------------- 3kV
MM (Machine Model) ----------------------------------------------------------------------------------------------- 250V
Recommended Operating Conditions
(Note 4)
Supply Voltage, VIN ----------------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range ------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 12V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Current
Shutdown Current
ISHDN
VEN = 0V
--
1
10
A
Quiescent Current
IQ
VEN = 5V, VFB = 0.8V
--
1
1.3
mA
Logic-High
1.25
--
18
Logic-Low
--
--
0.85
Logic Threshold
EN Input Voltage
V
VFB Voltage and Discharge Resistance
Feedback Threshold Voltage
VFB
Feedback Input Current
IFB
VOUT Discharge Resistance
RDIS
TA = 25C
0.757 0.765 0.773
TA = 40C to 85C
0.755
--
0.775
VFB = 0.8V
--
0.01
0.1
A
VEN = 0V, VS = 0.5V
--
50
100
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DS7231/32/33/34-11
January 2022
V
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RT7231/32/33/34
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
4.8
5.1
5.4
V
VREG5 Output
VREG5 Output Voltage
VREG5
6V VIN 18V, 0 < IVREG5 5mA
Line Regulation
6V VIN 18V, IVREG5 = 5mA
--
--
20
mV
Load Regulation
0 IVREG5 5mA
--
--
100
mV
IVREG5
VIN = 6V, VREG5 = 4V
--
70
--
mA
High-Side
RDS(ON)_H
(VBOOT VSW ) = 5.5V
--
120
--
Low-Side
RDS(ON)_L
--
50
--
4.9
5.85
6.8
--
150
--
--
20
--
Output Current
RDS(ON)
Switch On
Resistance
Current Limit
Current Limit
Thermal Shutdown
Thermal Shutdown Threshold
ILIM
TSD
Shutdown Temperature
Thermal Shutdown Hysteresis TSD
m
A
C
On-Time Timer Control
On-Time
tON
VIN = 12V, VOUT = 1.05V
--
135
--
ns
Minimum Off-Time
tOFF(MIN)
VFB = 0.7V
--
260
310
ns
SS Charge Current
VSS = 0V
5
6
8
A
SS Discharge Current
VSS = 0.5V
0.1
0.2
--
mA
Wake Up VREG5
3.6
3.85
4.1
0.16
0.35
0.47
VFB Rising
85
90
95
VFB Falling
--
85
--
Soft-Start
UVLO
UVLO Threshold
Hysteresis
V
Power Good
PGOOD Threshold
%
PGOOD Sink Current
PGOOD = 0.5V
Output Under Voltage and Over Voltage Protection
OVP Trip Threshold
OVP Detect
2.5
5
--
mA
115
120
125
%
OVP Prop Delay
UVP Trip Threshold
-65
5
70
-75
s
UVP Hysteresis
--
10
--
UVP Prop Delay
--
250
--
s
--
tSS
x 1.7
--
ms
UVP Enable Delay
tUVPEN
Relative to Soft-Start Time
%
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. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC 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.
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is a registered trademark of Richtek Technology Corporation.
DS7231/32/33/34-11
January 2022
RT7231/32/33/34
Typical Application Circuit
RT7231/32/33/34
VIN
C1
10µF x 2
C2
0.1µF
VIN
VCC*
BOOT
C6
0.1µF
C5
3.9nF
C7
22µF x 2
R1
8.25k
R2
22k
R3
100k
C4
1µF
C3
FB
PGOOD*
Power GOOD
VOUT
1.05V/4A
SW
EN
Input Signal
L1
1.4µH
VREG5
SS
GND*
VS*
PGND
* : VCC pin for TSSOP-14 (Exposed Pad) only.
VS pin for TSSOP-14 (Exposed Pad) only.
GND pin for TSSOP-14 (Exposed Pad) only.
PGOOD pin for TSSOP-14 (Exposed Pad) and WDFN-10L 3x3 only.
Table 1. Suggested Component Values (VIN = 12V)
VOUT (V)
R1 (k)
R2 (k)
C3 (pF)
L1 (H)
C7 (F)
1
6.81
22.1
--
1.5
22 to 68
1.05
8.25
22.1
--
1.5
22 to 68
1.2
12.7
22.1
--
1.5
22 to 68
1.5
21
22.1
--
1.5
22 to 68
1.8
30.1
22.1
5 to 22
2
22 to 68
2.5
49.9
22.1
5 to 22
2
22 to 68
3.3
73.2
22.1
5 to 22
2
22 to 68
124
22.1
5 to 22
3.3
22 to 68
12
2.16
50 to 220
3.3
22 to 68
180
22.1
5 to 22
3.3
22 to 68
5
7
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DS7231/32/33/34-11
January 2022
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RT7231/32/33/34
Typical Operating Characteristics
Efficiency vs. Output Current
Efficiency vs. Output Current
100
RT7231/33
90
90
80
80
70
VIN = 5V
VIN = 12V
VIN = 18V
60
Efficiency (%)
Efficiency (%)
100
50
40
30
RT7232/34
70
VIN = 5V
VIN = 12V
VIN = 18V
60
50
40
30
20
20
10
10
VOUT = 1.05V
0
0.001
0.01
0.1
1
VOUT = 1.05V
0
0.001
10
0.01
Output Current (A)
Output Voltage vs. Input Voltage
10
Feedback Threshold Voltage (V)
0.780
1.058
Output Voltage (V)
1
Feedback Threshold Voltage vs. Temperature
1.060
1.056
1.054
1.052
1.050
1.048
1.046
1.044
1.042
VIN = 4.5V to 18V, VOUT = 1.05V
1.040
0.775
0.770
0.765
0.760
0.755
VIN = 12V, VOUT = 1.05V, IOUT = 0A
0.750
4
6
8
10
12
14
16
18
-50
-25
0
Input Voltage (V)
RT7231/33
1.09
1.08
1.08
Output Voltage (V)
1.09
1.07
1.06
1.05
VIN = 18V
VIN = 12V
VIN = 5V
1.03
50
75
100
125
Output Voltage vs. Output Current
1.10
1.04
25
Temperature (°C)
Output Voltage vs. Output Current
1.10
Output Voltage (V)
0.1
Output Current (A)
1.02
RT7232/34
1.07
1.06
1.05
VIN = 18V
VIN = 12V
VIN = 5V
1.04
1.03
1.02
1.01
1.01
VOUT = 1.05V
1.00
VOUT = 1.05V
1.00
0
0.5
1
1.5
2
2.5
3
3.5
Output Current (A)
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4
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Current (A)
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Switching Frequency vs. Temperature
700
690
690
Switching Frequency (kHz)1
Switching Frequency (kHz)1
Switching Frequency vs. Input Voltage
700
680
670
660
650
640
630
620
610
680
670
660
650
640
630
620
610
600
600
4
6
8
10
12
14
16
18
-50
-25
0
Input Voltage (V)
Current Limit vs. Temperature
50
75
100
125
Current Limit vs. Input Voltage
7.0
7.0
6.5
6.5
Current Limit (A)
Current Limit (A)
25
Temperature (°C)
6.0
5.5
5.0
4.5
6.0
5.5
5.0
4.5
VIN = 12V, VOUT = 1.05V
4.0
4.0
-50
-25
0
25
50
75
100
125
4
10
12
14
16
Load Transient Response
Load Transient Response
18
20
RT7231/32/33/34
VOUT
(20mV/Div)
VOUT
(5mV/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 0A to 4A
Time (100μs/Div)
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DS7231/32/33/34-11
8
Input Voltage (V)
RT7231/33
IOUT
(2A/Div)
6
Temperature (°C)
January 2022
IOUT
(2A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 1A to 4A
Time (100μs/Div)
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RT7231/32/33/34
Switching
Switching
VSW
(10V/Div)
VSW
(10V/Div)
VOUT
(5mV/Div)
VOUT
(5mV/Div)
IL
(1A/Div)
IL
(2A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 1A
Time (1μs/Div)
Time (1μs/Div)
Power On from VIN
Power Off from VIN
VIN
(5V/Div)
VIN
(5V/Div)
VOUT
(1V/Div)
VOUT
(1V/Div)
IOUT
(5A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
IOUT
(5A/Div)
Time (10ms/Div)
Power On from EN
Power Off from EN
VEN
(5V/Div)
VOUT
(500mV/Div)
VOUT
(500mV/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (500μs/Div)
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VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (2.5ms/Div)
VEN
(5V/Div)
IOUT
(2A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
IOUT
(2A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (500μs/Div)
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EN Threshold Voltage vs. Temperature
UVLO Voltage vs. Temperature
4.0
1.4
3.9
1.3
1.2
UVLO Voltage (V)
EN Threshold Voltage (V)
1.5
Rising
1.1
Falling
1.0
0.9
Rising
3.8
3.7
3.6
Falling
3.5
0.8
VIN = 12V, VOUT = 1.05V
0.7
3.4
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
Temperature (°C)
Temperature (°C)
Power Good from EN Turn On
Power Good from EN Turn Off
RT7231/32
RT7231/32
VEN
(5V/Div)
VEN
(5V/Div)
VPGOOD
(5V/Div)
VPGOOD
(5V/Div)
VOUT
(1V/Div)
VOUT
(1V/Div)
IOUT
(5A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (250μs/Div)
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January 2022
IOUT
(5A/Div)
VIN = 12V, VOUT = 1.05V, IOUT = 4A
Time (2.5ms/Div)
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RT7231/32/33/34
Application Information
The RT7231/32/33/34 is a synchronous high voltage Buck
converter that can support the input voltage range from
4.5V to 18V and the output current up to 4A. It adopts
ACOT® mode control to provide a very fast transient
response with few external compensation components.
the EN pin can also be externally pulled high by adding a
REN resistor and CEN capacitor from the VIN pin (see Figure
1).
EN
VIN
Advanced Constant On-Time Control
The RT7231/32/33/34 has a unique circuit which sets the
on-time by monitoring the input voltage and SW signal.
The circuit ensures the switching frequency operating at
650kHz over input voltage range and loading range.
Soft-Start
The RT7231/32/33/34 contains an external soft-start clamp
that gradually raises the output voltage. The soft-start
timing can be programmed by the external capacitor
between the SS and GND pins. The chip provides a 6μA
charge current for the external capacitor. If a 3.9nF
capacitor is used, the soft-start will be 0.5ms (typ.). The
available capacitance range is from 2.7nF to 220nF.
t SS (ms) =
C5 (nF) 0.765
ISS ( A)
Chip Enable Operation
The EN pin is the chip enable input. Pulling the EN pin
low (
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