R1260S Series
60V Input / 80V Absolute Maximum Rating Synchronous Step-down DC/DC Controller
No.EA-511-210712
1
The R1260S is a step-down DC/DC controller which can generate an output voltage of 1.0 V to 16.0 V by
driving external high- / low-side NMOSFETs. By the adoption of a unique current mode PWM architecture
without an external current sense resistor, this device can make up a stable DC/DC converter with high-
efficiency even if adding low Ron MOSFETs and a low DCR inductor externally.
● 48 V power can be provided by a wide-ranging input voltage of 5 V to 60 V.
● High-accuracy feedback voltage: 0.8 V ±1.5% (−40°C ≤ Ta ≤ 105°C)
● High efficiency at light load (I
OUT
=1mA) by VFM control (80% @V
IN
=24V, 70% @V
IN
=48V)
•
Input Voltage Range: 5 V to 60 V
• Maximum Rating: 80 V
• Output Voltage Range: 1.0 V to 16.0 V
• Feedback Voltage: 0.8 V ±1.5%
• 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. 130 ns
• Minimum OFF Time: Typ.120 ns
• Selectable Output Voltage Controls: PWM/VFM
Auto-switching mode / Forced PWM / PLL_PWM
mode
• Operating Temperature Range: -40°C to 105°C
• Spread Spectrum Clock Generator (SSCG)*Option
• Power Good Output
• Undervoltage Detection (UVD),
Overvoltage Detection (OVD)
• Undervoltage Lockout (UVLO)
• Thermal Shutdown: Tj = 160°C (Typ.)
• Overcurrent Protection: Hiccup-type, Latch-type
• Short-circuit Protection: LX to V
IN
or GND
HSOP-18
(5.2 mm x 6.2 mm x 1.45 mm)
• Power source for systems that require step-down from high voltages such as 24V or 48V.
・
PLC
・
PoE Drive Equipment
・
FA Equipment
・
5G Base Station
・
Industrial Equipment
etc.
OVERVIEW
KEY BENEFITS
TYPICAL CHARACTERISTICS
KEY SPECIFICATIONS
APPLICATIONS
0
10
20
30
40
50
60
70
80
90
100
0.1 1 10 100 1000 10000
Efficiency [%]
I
OUT
[mA]
V
OUT
= 5.0V, F
OSC
= 250kHz
VIN=12V
VIN=24V
VIN=48V
MODE=H
MODE=L
PACKAGE
R1260S
No.EA-511-210712
2
SELECTION GUIDE
Product Name Package Quantity per Reel Pb Free Halogen Free
R1260Sxxyz-E2-FE HSOP-18 1,000 Yes Yes
xx：Select the set output voltage range.
xx
Set Output Voltage Range
01 1 V ≤ V
OUT
≤ 3.15 V
02 3.15V < V
OUT
≤ 8 V
03 8 V < V
OUT
≤ 16 V
y：Select the current limit threshold voltage.
y
Current limit threshold
voltage (Typ.)
Reverse current limit threshold
voltage (Typ.)
1 50mV －25mV
2 70mV －35mV
3 100mV －50mV
z：Select the combination of overcurrent protection and SSCG.
z Overcurrent Protection SSCG
A Hiccup mode Disable
B Hiccup mode Enable
C Latch mode Disable
D Latch mode Enable