®
RT6158A
High Efficiency, Low Quiescent, 2A Buck-Boost Converter
General Description
The RT6158A converter is a high efficiency single inductor
converter which can operate with wide input voltage 2.5V
to 5V such as battery which is higher or lower than the
output voltage and it can supply the load current up to 2A.
The maximum peak current in the switches is limited to a
typical value of 4.5A. Feedback loop is internally
compensated for both Buck and Boost operation and it
provides seamless transition between Buck and Boost
modes and optimal transient response. The Buck-Boost
operates at 2MHz typical switching frequency in full
synchronous operation.
The RT6158A operates in Pulse Frequency Modulation
(PFM) mode for increasing efficiency. The PFM mode can
be disabled, forcing the RT6158A to operate at a fixed
switching frequency operation at 2MHz. The RT6158A can
also be synchronized with external frequency at MODE
pin from 2.2MHz to 2.6MHz. The RT6158A output voltage
is programmable using an external resistor divider; the
output voltage range is from 2.1V to 5.2V.
Features
Input Voltage Range : 2.5V to 5V
Adjustable Output Voltage : 2.1V to 5.2V by External
Divided Resistors
Up to 2A Maximum Load Capability for V
IN
= 3V,
V
OUT
= 3.5V
Up to 96% Efficiency (V
IN
= 4.2V, V
OUT
= 3.5V, I
LOAD
=
0.5A)
OCP, OVP, OTP, UVLO and SCP Function
2MHz Switching Frequency
5μA Non-Switching Low Quiescent Current
μ
Forced PWM and Automatic PFM/PWM Mode
Selection
Output Fast Discharge Function
Automatic / Seamless Step Up and Step Down
Mode Transitions
25-Ball WL-CSP Package
Ordering Information
RT6158A
Package Type
WSC : WL-CSP-25B 2.07x2.33 (BSC)
Note :
Richtek products are :
½
Applications
Cellular Telephones
Wifi Module
Tablet PC
Portable Instrument
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
L1
LX1
V
IN
C
IN
AVIN
EN
FB
R2
MODE
AGND
PGND
PVIN
RT6158A
VOUT
R1
C
FF
C
OUT
V
OUT
LX2
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158A-05 August 2019
www.richtek.com
1
RT6158A
Marking Information
0M : Product Code
Pin Configuration
(TOP VIEW)
A1
A2
A3
A4
A5
0M YM
DNN
YMDNN : Date Code
PVIN
B1
PVIN
B2
PVIN
B3
PVIN
B4
AVIN
B5
LX1
C1
LX1
C2
LX1
C3
LX1
C4
EN
C5
PGND PGND PGND MODE AGND
D1
D2
D3
D4
D5
LX2
E1
LX2
E2
LX2
E3
LX2
E4
AGND
E5
VOUT VOUT
VOUT VOUT
FB
WL-CSP-25B 2.07x2.33 (BSC)
Functional Pin Description
Pin No.
A1, A2, A3, A4
A5
B1, B2, B3, B4
B5
C1, C2, C3
Pin Name
PVIN
AVIN
LX1
EN
PGND
Pin Function
Power input supply. The input voltage range is from 2.5V to 5V after soft-start is
finished. Connect input capacitors between this pin and PGND with a wide PCB
trace.
Analog input supply. AVIN Connect to PVIN.
Switching node 1. Connect to inductor.
Chip enable. This input must not be left floating and must be terminated.
Power ground. Connect to this pin with the shortest path for power transmission
to reduce parasitic component effect.
High for PFM mode, low for FCCM mode. This pin also can be used to
synchronize switching frequency with 2.2MHz to 2.6MHz. This input must not
be left floating and must be terminated.
Analog ground. This is the signal reference ground for the IC.
Switching node 2. Connect to inductor.
Output voltage pin. PCB trace length from VOUT to the output filter capacitor
should be as short and wide as possible.
Output voltage feedback. The typical value of the voltage at the FB pin is
800mV.
C4
C5, D5
MODE
AGND
D1, D2, D3, D4 LX2
E1, E2, E3, E4
E5
VOUT
FB
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS6158A-05 August 2019
RT6158A
Functional Block Diagram
LX1
LX2
PVIN
A
Power
MOS
Gate
Driver
D
Rd
DIS
VOUT
AVIN
UVLO
B
OCP
C
EN
Digital
Control
MODE
DIS
PWM
Control
AMP
-
+
V
REF
FB
AGND
PGND
OSC
OVP
OTP
SCP
Operation
The RT6158A is a synchronous current mode constant
on/off time (CMCOT) switching Buck-Boost converter
designed to an adjustable output voltage with an input
supply that can be above, equal, or under the output
voltage. The 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. The output voltage of the RT6158A is
adjustable, and can be set by the external divided resistor.
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
RT6158A automatically enters Buck or Boost mode. In
that case, the converter will maintain the regulation for
output voltage and keep a minimum current ripple in the
inductor to guarantee good performance.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158A-05 August 2019
www.richtek.com
3
RT6158A
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6V
−0.3V
to 6V
−0.3V
to 6V
−3V
to 8.5V
−0.3V
to 6V
Input Voltage, PVIN, AVIN -----------------------------------------------------------------------------------------------
Output Voltage, VOUT ---------------------------------------------------------------------------------------------------
Switch Node Voltage, LX1, LX2 ----------------------------------------------------------------------------------------
< 20ns ------------------------------------------------------------------------------------------------------------------------
Other I/O Pins Voltage (EN, MODE, FB) ----------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WL-CSP-25B 2.07x2.33 (BSC) ---------------------------------------------------------------------------------------- 2.8W
Package Thermal Resistance (Note 2)
WL-CSP-25B 2.07x2.33 (BSC),
θ
JA
----------------------------------------------------------------------------------- 35.7°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
2.5V to 5V
2.1V to 5.2V
0A to 2A
−40°C
to 125°C
−40°C
to 85°C
Input Voltage, PVIN, AVIN -----------------------------------------------------------------------------------------------
Output Voltage, VOUT ---------------------------------------------------------------------------------------------------
Output Current, IOUT -----------------------------------------------------------------------------------------------------
Junction Temperature Range --------------------------------------------------------------------------------------------
Ambient Temperature Range --------------------------------------------------------------------------------------------
Electrical Characteristics
(V
IN
= 3.6V, V
OUT
= 3.5V, C
IN
= 10μF x 2, C
OUT
= 10μF x 4, L = 1μH, T
A
= 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Logic Input High Threshold
Logic Input Low Threshold
Under-Voltage Lockout
Under-Voltage Lockout
Hysteresis
Shutdown Current
Input Quiescent Current
Switching Quiescent Current
Switching Frequency
Switching Frequency
Synchronous Switching
Frequency Range
Symbol
V
IN
V
IH
V
IL
V
UVLO
V
UVLO_H
I
SHDN
I
QVIN
I
QSW
f
SWCOT
f
SWCCM
f
SWSYNC
Rising
Test Conditions
PVIN and AVIN
Min
2.5
1.2
--
2.05
0.02
Typ
--
--
--
2.15
0.1
--
5
8
2
2
--
Max
5
--
0.4
2.25
0.25
1
8
11
2.6
2.8
2.6
Unit
V
V
V
V
V
A
A
A
MHz
MHz
MHz
V
IN
= 3.5V, EN = L
Non-switching. V
IN
= 4.2V, V
OUT
=
3.5V, EN = VIN, Mode = VIN
I
LOAD
= 0A. V
IN
= 4.2V, V
OUT
=
3.5V, EN = VIN, Mode = VIN
MODE = H, |V
IN
- V
OUT
| > 1V
MODE = L
MODE = square wave, 10% < duty
< 90%
--
2
5
1
1.3
2.2
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS6158A-05 August 2019
RT6158A
Parameter
Symbol
t
SS_EN
Soft-Start Time
t
SS
t
SS
Minimum off Time
Minimum on Time
FB Voltage
High Side Switch On-
Resistance
Low Side Switch On-
Resistance
Output Over-Voltage
Protection
t
OFF_MIN
t
ON_MIN
CCM operation
R
DS_ON_A, D
V
OUT
= 5V
R
DS_ON_B, C
V
OUT
= 5V
V
OVP
V
IN
= 3.6V, V
OUT
= 3.3V
V
IN
= 3.6V, V
OUT
= 3.3V
Test Conditions
Time from EN goes H to 90%
VOUT starts ramp up
V
IN
= 4V, V
OUT
= 3.5V,
I
LOAD
= 200mA
V
IN
= 2.5V, V
OUT
= 3.5V,
I
LOAD
= 200mA
Min
0.3
0.3
0.6
15
25
0.792
12
12
5.3
--
--
15
(Note 5)
(Note 5)
--
--
4.3
V
IN
= 2.5V to 5V, V
OUT
= 3.5V,
CCM, I
LOAD
= 1.5A
V
IN
= 2.5V to 5V, V
OUT
= 3.5V,
CCM operation, I
LOAD
< 2A
V
OUTp-to-p
V
IN
= 3V to 3.6V at 10s, V
OUT
=
3.5V, I
LOAD
= 1A
V
IN
= 3.4V, V
OUT
= 3.5V, I
LOAD
=
0.5A to 1A at 1s
2
2
--
--
Typ
1
1
2
40
40
0.8
20
20
5.6
200
200
40
160
20
4.5
0.6
0.6
100
250
Max
2
2
4
65
80
0.808
30
30
5.9
--
--
70
--
--
5
2
2
200
400
ns
ns
V
m
m
V
mA
mA
ms
°C
°C
A
%
%
mV
mV
ms
Unit
Load Current Threshold, PFM
I
TH_PWM
to PWM
Load Current Threshold,
PWM to PFM
FAULT Time
Thermal Shutdown
Over-Temperature Protection
Hysteresis
Inductor Peak Current Limit
Line Regulation
Load Regulation
Line Transient
Load Transient
I
TH_PFM
t
FAULT
T
OTP
T
OTP_HYS
I
CL
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 under natural convection (still air) at T
A
= 25°C with the component mounted on a high effective-
thermal-conductivity four-layer test board on a JEDEC 51-7 thermal measurement standard.
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.
T
OTP
and T
OTP_HYS
are guaranteed by design.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158A-05 August 2019
www.richtek.com
5
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