60V Input / 80V Absolute Maximum Rating
Synchronous Step-down DC/DC Controller
AEC-Q100 Compliant
48 V power can be provided by a wide-ranging input voltage of 5 V to 60 V.
High efficiency at light load (I
OUT
=1mA) by VFM control (80% @V
IN
=24V, 70% @V
IN
=48V).
EMI noise reduction by using a spread spectrum clock generator. (Diffusion Rate: -7.2%)
KEY SPECIFICATIONS
PACKAGE
Input Voltage Range (Max. Ratings): 5 V to 60 V (
80 V)
Operating Temperature Range: Automotive (-40°C to 125°C),
Industrial (-40°C to 125°C), Consumer (-40°C to 105°C)
Output Voltage Range: 1.0 V to 16.0 V
Feedback Voltage： 0.8V±1.5%
(at the range of operation temperature.)
Consumption Current at No Load： Typ. 15µA (at VFM mode)
Oscillator Frequency： 150kHz to 600kHz
Adjustable Soft-start with an external capacitor：
600µs (without external capacitor)
Minimum ON Time：Typ. 130ns /Minimum OFF Time：Typ. 120ns
Switching Control： Auto-switching mode、
Forced PWM / PLL_PWM mode
SSCG(Spread Spectrum Clock Generator) ※Option
Power Good Output
�� Thermal Shutdown： Tj=160℃
Undervoltage Detection (UVD), Overvoltage Detection (OVD)
Undervoltage Lockout (UVLO)
Overcurrent Protection: Hiccup-type, Latch-type
Short-circuit Protection: LX to V
IN
or GND
In-v
ehicle equipment powered by a 24V battery or 48V mild hybrid
system.
Constant voltage source for control units such as EV inverters and
c
hargers.
Power source for systems that require step-d
own from high voltages
such as 24V or 48V.
(・PLC ・PoE Drive Equipment ・FA Equipment ・5G Base Station
・Industrial Equipment etc.)
APPLICATIONS
TYPICAL APPLICATION CIRCUIT
HSOP-18
(5.2mm x 6.2mm x 1.45mm)
R1260Sxxyz
V CC
HGA TE
B ST
LGA TE
LX
MO DE
PGND
PGOOD
AGND
V IN
VOUT
CSS/T RK
FB
CE
RT
COMP
SENSE
V
IN
5V to 60V
L 15uH
V
OUT
5V
HS/LS NCH-FET
SQJ402EP
NC
C
C2
330pF
C
C
10nF
R
C
5.6kΩ
R
RT
117kΩ
(160k//430k)
R
BO T
22kΩ
R
TO P
115kΩ
C
SP D
150pF
C
SS
33nF
C
IN
30uF
R
SE N
3mΩ
C
O UT
222uF
C
VC C
2.2uF
C
BS T
0.22uF
Diode
DFLS1100Q-7
R1260S Typical Application Circuit at 250kHz / 5.0V
1/5
R1260S-EV-220606
60V Input / 80V Absolute Maximum Rating
Synchronous Step-down DC/DC Controller
AEC-Q100 Compliant
2/5
R1260S-EV-220606
48 V power can be provided by a wide-ranging input voltage of 5 V to 60 V.
R1260S is a high-efficiency IC that can step-down directly to the 3.3V / 5.0V from 48V battery.
Efficiency is improved because R1260S can step-down
directly to 3.3V / 5.0V from 48V battery in one step.
MCU
VCC
VIN
R1260
DC/DC
controller
24V/48V
Battery
3.3V/5.0V
Total Efficiency：85%
V
IN
=48V,V
OUT
=5.0V,I
OUT
=10mA
MCU
VCC
VIN
DC/DC
controller
24V/48V
Battery
3.3V/5.0V
Total Efficiency：80*85=68%
VIN
DC/DC
controller
12V
24V/48V
Efficiency：80%
85%
Conventional Step-down (2-step) Example
Example of Step-down (1-step) Using R1260
24V/48V
General Issue
Our Solution
Want a highly efficient IC that can directly step down from a 48V battery voltage.