®
RT6158H
High Efficiency, Low Quiescent, 3A Buck-Boost Converter
General Description
The RT6158H converter is a high efficiency single inductor
converter which can operate with wide input voltage such
as battery which is higher or lower than the output voltage
and it can supply the load current up to 3A. The maximum
peak current in the switches is limited to a typical value of
6.5A. 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 1.5MHz
typical switching frequency in full synchronous operation.
The RT6158H operates in Pulse Frequency Modulation
(PFM) mode for increasing efficiency during low power
RF transmission modes. The PFM mode can be disabled,
forcing the RT6158H to operate at a fixed switching
frequency operation at 2MHz. The RT6158H can also be
synchronized with external frequency from 2.2MHz to
2.6MHz. The RT6158H 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 5.5V
Adjustable Output Voltage : 2.1V to 5.2V by External
Divided Resistors
Up to 3A Maximum Load Capability for V
IN
= 3V,
V
OUT
= 3.5V
Up to 96% Efficiency
OCP, OVP, OTP Protected Function
2MHz Switching Frequency
5μA Non-Switching Low Quiescent Maximizes
μ
Light Load Efficiency
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
Applications
Ordering Information
RT6158H
Package Type
WSC : WL-CSP-25B 2.07x2.33 (BSC)
Note :
Richtek products are :
½
Cellular Telephones
RF Power Amplifiers
Tablet PC
Portable Instrument
Pin Configuration
(TOP VIEW)
A1
A2
A3
A4
A5
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
PVIN
B1
PVIN
B2
PVIN
B3
PVIN
B4
AVIN
B5
½
Suitable for use in SnPb or Pb-free soldering processes.
LX1
LX1
C2
LX1
C3
LX1
C4
EN
C5
Marking Information
0K : Product Code
C1
PGND PGND PGND MODE AGND
D1
D2
D3
D4
D5
0K YM
DNN
YMDNN : Date Code
LX2
E1
LX2
E2
LX2
E3
LX2
E4
AGND
E5
VOUT VOUT
VOUT VOUT
FB
WL-CSP-25B 2.07x2.33 (BSC)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158H-01
September 2017
www.richtek.com
1
RT6158H
Typical Application Circuit
L1
1µH
V
IN
2.5V to 5.5V
B1, B2, B3, B4
D1, D2, D3, D4
LX1
LX2
A1, A2, A3, A4
PVIN
RT6158H
C
IN1
E1, E2, E3, E4
VOUT
10µF x 2
A5 AVIN
B5 EN
100k
R1
1M
FB
E5
R2
294k
C4
MODE
AGND
C5, D5
PGND
C1, C2, C3
C
FF
56pF
C
OUT
22µF x 2
V
OUT
2.1V to 5.2V
Pull high voltage
(For PFM operation)
(R1 x C
FF
) value should be 56 x 10
−6
(typ) for component selection.
BOM List
Reference
C
IN
C
OUT
C
FF
L1
Description
10F/6.3V/X5R
22F/6.3V/X5R
56pF/50V/X5R
1H, ±20%
Manufacturer
Murata –
GRJ155R60J106ME11D
Murata –
GRM188R60J226ME15D
Murata –
GRM0335C1H560JA01D
DFE252010F – 1R0M = P02
Package
0402
0603
0201
2520
Parameter
C
C
C
L
DCR (Series R)
Typ
10
22
56
1
48
Unit
F
F
pF
H
m
Functional Pin Description
Pin No.
A1, A2, A3, A4
A5
B1, B2, B3, B4
B5
C1, C2, C3
C4
C5, D5
Pin Name
PVIN
AVIN
LX1
EN
PGND
MODE
AGND
Power input supply.
Analog input supply.
Phase 1. Switching node 1. Connect to inductor.
Chip enable. This input must not be left floating and must be terminated.
Power ground.
High for PFM mode, low for FCCM mode. This pin also can be used to
synchronous switching frequency with 2.2MHz to 2.6MHz. This input must not
be left floating and must be terminated.
Analog ground.
Phase 2. Switching node 2. Connect to inductor.
Output power.
Voltage feedback.
is a registered trademark of Richtek Technology Corporation.
Pin Function
D1, D2, D3, D4 LX2
E1, E2, E3, E4
E5
VOUT
FB
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
DS6158H-01
September 2017
RT6158H
Functional Block Diagram
LX1
LX2
PVIN
A
D
Rd
VOUT
AVIN
UVLO
B
OCP
Gate
DRV
C
DIS
EN
Digital
Control
MODE
DIS
PWM
Control
AMP
-
+
V
REF
FB
AGND
PGND
OSC
OVP
OTP
SCP
Operation
The RT6158H is a synchronous current mode constant
on/off time (CMCOT) switching Buck-Boost converter
designed to an adjustable output voltage from an input
supply that can be above, equal, or below 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 RT6158H is
adjustable, and can be set by the external divider resistor
value. 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
RT6158H 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
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158H-01
September 2017
www.richtek.com
3
RT6158H
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6V
−0.3V
to 6V
−3V
to 8.5V
−0.3V
to 6V
2.8W
Supply Input Voltage ----------------------------------------------------------------------------------------------------
LX1, LX2 -------------------------------------------------------------------------------------------------------------------
< 20ns ----------------------------------------------------------------------------------------------------------------------
Other Pins -----------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
WL-CSP-25B 2.07x2.33 (BSC) ---------------------------------------------------------------------------------------
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
(Note 4)
Recommended Operating Conditions
Supply Input Voltage ---------------------------------------------------------------------------------------------------- 2.5V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= 3.6V, T
A
= 25°C, unless otherwise specified)
Parameter
Input Power Source
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
Test Conditions
Min
Typ
Max
Unit
2.5
V
IH
V
IL
V
UVLO
V
UVLO_H
I
SHDN
I
QVIN
I
QSW
f
SWCOT
f
SWCCM
f
SWSYNC
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%
1.2
--
2.05
--
--
--
--
--
--
2.2
--
--
--
--
0.1
--
5
8
2
2
--
5.5
--
0.4
2.25
--
1
7
10
--
--
2.6
V
V
V
V
V
A
A
A
MHz
MHz
MHz
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS6158H-01
September 2017
RT6158H
Parameter
Symbol
t
SS_EN
Soft-Start Time
t
SS
t
SS
Minimum Off Time
Minimum On Time
FB Voltage
High Side Switch R
DS(ON)
Low Side Switch R
DS(ON)
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 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
--
--
--
--
--
0.792
12
12
5.3
--
--
--
--
T
OTP_HYS
I
CL
V
IN
= 2.5V to 5.5V, V
OUT
= 3.5V,
CCM, I
LOAD
= 1.5A
V
IN
= 2.5V to 5.5V, V
OUT
= 3.5V,
CCM operation, I
LOAD
< 3A
V
OUTp-to-p
V
OUTp-to-p
V
IN
= 2.5V to 5.5V, I
LOAD
> 1A
V
IN
= 3V to 3.6V at 10s, V
OUT
=
3.5V, I
LOAD
= 1A
V
IN
= 3.4V, V
OUT
= 3.5V, Loading =
0.5A to 1A at 1s
--
6
--
--
--
--
--
Typ
1
1
2
40
40
0.8
20
20
5.6
200
200
40
160
20
6.5
0.6
0.6
20
100
±60
Max
--
--
--
--
--
0.808
30
30
5.9
--
--
--
--
--
7
--
--
--
--
--
Unit
ms
ms
ms
ns
ns
V
m
m
V
mA
mA
ms
°C
°C
A
%
%
mV
mV
mV
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
Output Voltage Ripple
Line Transient
Load Transient
I
TH_PFM
T
FAULT
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.
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.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS6158H-01
September 2017
www.richtek.com
5
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