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RT6296F Dataheets PDF



Part Number RT6296F
Manufacturers Richtek
Logo Richtek
Description 17V Current Mode Synchronous Step-Down Converter
Datasheet RT6296F DatasheetRT6296F Datasheet (PDF)

RT6296F 2A, 17V Current Mode Synchronous Step-Down Converter General Description The RT6296F is a high-efficiency, 2A current mode synchronous step-down DC-DC converter with a wide input voltage range from 4.5V to 17V. The device integrates 100m high-side and 40m low-side MOSFETs to achieve high efficiency conversion. The current mode control architecture supports fast transient response and internal compensation. The RT6296F provides power good pin to be an output voltage ready indicator. A.

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RT6296F 2A, 17V Current Mode Synchronous Step-Down Converter General Description The RT6296F is a high-efficiency, 2A current mode synchronous step-down DC-DC converter with a wide input voltage range from 4.5V to 17V. The device integrates 100m high-side and 40m low-side MOSFETs to achieve high efficiency conversion. The current mode control architecture supports fast transient response and internal compensation. The RT6296F provides power good pin to be an output voltage ready indicator. A cycle-by-cycle current limit function provides protection against shorted output. The RT6296F provides complete protection functions such as input under-voltage lockout, output under-voltage protection, over-current protection, and thermal shutdown. The PWM frequency is adjustable by the EN/SYNC pin. The RT6296F is available in the TSOT-23-8 (FC) package. Ordering Information RT6296F Package Type J8F : TSOT-23-8 (FC) Lead Plating System G : Green (Halogen Free and Pb Free) Features  4.5V to 17V Input Voltage Range  2A Output Current  Internal N-Channel MOSFETs  Current Mode Control  Fixed Switching Frequency : 500kHz  Synchronous to External Clock : 200kHz to 2MHz  Cycle-by-Cycle Current Limit  Internal Soft-Start Function  Power Saving Mode at Light Load  Power Good Indicator  Input Under-Voltage Lockout  Output Under-Voltage Protection  Thermal Shutdown  RoHS Compliant and Halogen Free Applications  Industrial and Commercial Low Power Systems  Computer Peripherals  LCD Monitors and TVs  Set-top Boxes Note : Richtek products are :  RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.  Suitable for use in SnPb or Pb-free soldering processes. Marking Information 0B=DNN 0B= : Product Code DNN : Date Code Simplified Application Circuit VIN Enable C1 C2 R3 RT6296F VIN BOOT C3 SW EN/SYNC PVCC R5 FB PG GND L1 R1 R2 VOUT C4 Copyright © 2018 Richtek Technology Corporation. All rights reserved. DS6296F-03 May 2018 is a registered trademark of Richtek Technology Corporation. www.richtek.com 1 RT6296F Pin Configuration (TOP VIEW) FB PVCC EN/SYNC BOOT 87 6 5 2 34 PG VIN SW GND TSOT-23-8 (FC) Functional Pin Description Pin No. 1 2 3 Pin Name PG VIN SW Pin Function Power good output. This pin is an open drain which can be connected to PVCC by a resistor. If output voltage achieve 90% of the normal voltage, the PG pin will go high after 400s delay. Power input. Support 4.5V to17V Input Voltage. Must bypass with a ceramic capacitor at this pin. Switch node. Connect to external L-C filter. 4 GND System ground. 5 BOOT Bootstrap supply for high-side gate driver. Connect a 0.1F ceramic capacitor between the BOOT and SW pins. Enable control input. High = Enable. Apply an external clock to adjust the 6 EN/SYNC switching frequency. If using pull high resistor connected to VIN, the recommended value range is 60k to 300k. 7 PVCC 5V Bias supply output. Connect a minimum of 0.1F capacitor to ground. 8 FB Feedback voltage input. The pin is used to set the output voltage of the converter to regulate to the desired voltage via a resistive divider. Feedback reference = 0.807V. Copyright © 2018 Richtek Technology Corporation. All rights reserved. www.richtek.com 2 is a registered trademark of Richtek Technology Corporation. DS6296F-03 May 2018 Functional Block Diagram PG PVCC VIN RT6296F EN/SYNC 1.4V Shutdown Comparator - + 0.4V + - UV Comparator 1pF 50pF 400k FB 0.807V + EA Internal SS + UVLO Logic & Protection Control Oscillator Internal Regulator Current Sense BOOT UVLO Power Stage & Deadtime Control HS Switch Current Comparator Slope Compensation LS Switch Current Comparator Current Sense BOOT SW GND Operation Power Saving Mode The RT6296F automatically enters into power saving mode (PSM) at light load to improve efficiency. In PSM, the RT6296F disable the internal CLK when VFB is above the VREF x 1.005 (typ.). In other words, the device automatically skip the PWM pulse at light load. While VFB falls below the VREF x 1.005, the RT6296F enables the internal CLK again and hence the new switching cycle is activated. When the internal switches are activated, for each cycle the device detects the peak inductor current (IL_PEAK) and keeps high-side switch on until the IL reaches its minimum peak current level (as shown in Figure 1). When low-side switch is turn-on, the zero-current detection is also activated to prevent that IL becomes negative and enables the higher efficiency at light load. During the period that both switches are off, the device turns off the most of the internal circuit to reduce the quiescent power consumption further. With lower output loading, the non-switching period is longer, so the effective switching frequency becomes lower to reduce the switching loss and switch driving loss. MPC IL SW Figure 1. Minimum Peak Current at PSM Power Good Indicatio.


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