R1273L-Y Series 34V, 1ch_14A Synchronous Step-down DC/DC Converter for Industrial Applications
The R1273L is a step-down DC/DC converter which can generate an output voltage of 0.7 V to 5.3 V by driving high- / low-side NMOSs. By the adoption of a unique current mode PWM architecture without an external current sense resistor, the R1273L can make up a stable DC/DC converter with high-efficiency even if adding a low DCR inductor externally. And, by the frequency characteristics optimization with using external phase compensation capacitor, the R1273L can achieve a high-speed response to variations of input voltage and load current. The user-settable oscillation frequency is adjustable over a range of 250 kHz to 1 MHz by external resistors, and also can be synchronized to an external clock in a range of 250 kHz to 1 MHz. The R1273L supports three operating modes: Forced PWM mode, PLL_PWM mode, and PWM/VFM Auto-switching mode. These modes are selectable according to conditions of the MODE pin. Especially, the PWM/VFM Auto-switching mode can improve efficiency under light load conditions.
The R1273L can minimize the output voltage drop caused by an input voltage drop at cranking, with reducing the operating frequency (the lowest possible limit is a quarter of the frequency) so that the off-duty is reduced.Protection functions include a current limit function, a hiccup-mode short-circuit protection (non-latch type), a thermal shutdown function, an UVLO (Under Voltage Lock Out) function, an OVD (Over Voltage Detection) function, a soft-start function, a low-inductor current shutdown function, and so on. Also, a power good function provides the status of output with using a power good (PGOOD) pin.
For EMI reduction, SSCG (Spread-Spectrum Clock Generator) for diffused oscillation frequency at the PWM operation is optionally available. The R1273L is available in QFN0505-32B package.This is a high-reliability semiconductor device for industrial application (-Y) that has passed both the screening at high temperature and the reliability test with extended hours.
FEATURES:
● Operating Voltage (Maximum Rating) ···················· 4.0 V to 34 V (36 V)
● Operating Temperature Range ······························ −40°C to 105°C
● Start-up Voltage ················································· 4.5 V
● Output Voltage Range ········································ 0.7 V to 5.3 V
● Feedback Voltage Tolerance ································ 0.64 V ±1%
● Consumption Current at No Load(at VFM mode) ······· Typ.15 μA
● Adjustable Oscillation Frequency························· 250 kHz to 1 MHz
● Synchronizable Clock Frequency························· 250 kHz to 1 MHz
● Minimum On-Time ············································ Typ.100 ns
● Minimum Off-Time ·············································· Typ.120 ns (at regulation mode)At dropout, actual minimum off-time is reduced.
● Adjustable Soft-start Time ·································· Typ.500 μs
● Pre-bias Start-up
● Anti-phase Clock Output
● Thermal Shutdown Function ································· Tj = 160ºC (Typ.)
● Under Voltage Lockout (UVLO) Function················· VCC = 3.3V (Typ.)
● Over Voltage Detection (OVD) Function ·················· FB pin voltage (VFB) + 10% (Typ.)Detection/Release Hysteresis ······························· FB pin voltage (VFB) x 3% (Typ.)
● Under Voltage Detection (UVD) Function ················· FB pin voltage (VFB) - 10% (Typ.) Detection/Release Hysteresis ······························· FB pin voltage (VFB) x 3% (Typ.)
● Selectable Over-current Protection ························· Hiccup-mode / Latch mode
● Selectable Current Limit Threshold ························· 50 mV / 70 mV / 100 mV
● High-side / Low-side Tr. ON-resistance ··················· Typ.11.8 mΩ / 12.3 mΩ
● Power Good Output ············································ NMOS Open-drain Output
● Package ··························································· QFN0505-32B
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R1273L-Y 、 R1273L 、 R1273LxxyA-E2-Y 、 R1273LxxxA 、 R1273L0xx 、 R1273L1xx 、 R1273Lxx2x |
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34V, 1ch_14A Synchronous Step-down DC/DC Converter 、 step-down DC/DC converter |
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[ Industrial Applications ][ Industrial equipment ][ FAs ][ smart meters ][ Equipment used under high-temperature conditions ][ surveillance camera ][ vending machine ][ Equipment accompanied by self-heating ][ motor ][ lighting ] |
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Datasheet |
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Please see the document for details |
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QFN0505-32B |
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English Chinese Chinese and English Japanese |
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EY-352-200106 |
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2.7 MB |
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