R1260S Series
60V Input / 80V Absolute Maximum Rating Synchronous Step-
down DC/DC Cont roller for Automotive Applications
No. EC-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 ≤ 125°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 125°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)
• Constant voltage source for control units such as EV inverters and chargers.
• 48 V battery system (mild hybrid), constant voltage source of battery management system.
• Constant voltage source from 24V battery system such as commercial vehicles.
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Efficiency [%]
I
OUT
[mA]
V
OUT
= 5.0V, F
OSC
= 250kHz
VIN=12V
VIN=24V
VIN=48V
MODE=H
MODE=L