rt8064 Richtek Technology Corporation, rt8064 Datasheet
rt8064
Available stocks
Related parts for rt8064
rt8064 Summary of contents
Page 1
... Synchronous Step-Down Converter General Description The RT8064 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.7V to 5.5V and provides an adjustable regulated output voltage from 0. while delivering output current. The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode ...
Page 2
... RT8064 Typical Application Circuit V IN 2.7V to 5.5V PGOOD Chip Enable Table 1. Recommended Components Selection for f V (V) R1 (kΩ) OUT 3.3 75 2.5 51 1.8 30 1 www.richtek.com 2 RT8064 VIN 10µF 100k PGOOD R 1 OSC 6 COMP RT 9 (Exposed Pad) GND (kΩ) R (kΩ ...
Page 3
... Ground Pin. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation ISEN Slope OSC Com Output Clamp 10µA Hiccup Control Logic 0.7V P-G OTP 0.4V UV PGOOD Pin Function VIN OC Limit Driver LX NISEN GND N-MOSFET I LIM RT8064 www.richtek.com 3 ...
Page 4
... RT8064 Absolute Maximum Ratings ---------------------------------------------------------------------------------------- −0. Supply Input Voltage Pin Switch Voltage -------------------------------------------------------------------------------------------- −0. Other I/O Pin Voltages ------------------------------------------------------------------------------------------- −0. Pin Switch Current -------------------------------------------------------------------------------------------- 5A Power Dissipation 25° SOP-8 (Exposed Pad) ------------------------------------------------------------------------------------------- 1.333W WDFN-8L 3x3 ------------------------------------------------------------------------------------------------------ 1.429W Package Thermal Resistance (Note 2) SOP-8 (Exposed Pad), θ ...
Page 5
... Note 4. The device is not guaranteed to function outside its operating conditions. DS8064-03 March 2011 Symbol Test Conditions V V Rising 10nF 25° high effective thermal conductivity four-layer test board of A RT8064 Min Typ Max Unit − − 0.7 0.4 μs ...
Page 6
... RT8064 Typical Operating Characteristics Efficiency vs. Output Current 100 5V 0.5 Output Current (A) Output Voltage vs. Output Current 1.130 1.120 1.110 1.100 1.090 1.080 1.070 0 0.5 Output Current (A) Switching Frequency vs. Temperature 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0. 1.1V OUT 0.94 -50 - Temperature (°C) www ...
Page 7
... Temperature (°C) Load Transient Response V OUT I OUT (1A/Div 5V OUT R = 33kΩ, C COMP Time (100μs/Div) Switching V LX (5V/Div) V OUT Time (500ns/Div) RT8064 50 75 100 125 = 3.3V 2A, OUT = 560pF COMP = 3.3V OUT OUT www.richtek.com 7 ...
Page 8
... RT8064 Power On from (5V/Div) V OUT (1V/Div) V PGOOD (10V/Div) I OUT (2A/Div 5V OUT Time (2.5ms/Div) Power On from (5V/Div) V OUT (2V/Div) V PGOOD (5V/Div) I OUT (5A/Div 5V Time (500μs/Div) www.richtek.com 1.1V 2A High OUT = 1.1V OUT OUT Power Off from V ...
Page 9
... However, when the RT pin is floating, the internal frequency is set at 2MHz. Determine the RT resistor value by examining the curve below. V OUT that is connected between the OSC 2.4 2.0 1.6 1.2 0.8 0.4 0.0 0 300 600 900 1200 Ω Figure 2. Switching Frequency vs. RT Resistor RT8064 1500 1800 2100 www.richtek.com 9 ...
Page 10
... D(MAX) where T the ambient temperature, and θ thermal resistance. For recommended operating condition specifications of the RT8064, the maximum junction temperature is 125°C and T thermal resistance, θ (Exposed Pad) packages, the thermal resistance, θ 75°C standard JEDEC 51-7 four-layer thermal test board. For WDFN-8L 3x3 packages, the thermal resistance, θ ...
Page 11
... Ambient Temperature (°C) Figure 3. Derating Curves for the RT8064 Package DS8064-03 March 2011 Layout Considerations Follow the PCB layout guidelines for optimal performance of the IC. Connect the terminal of the input capacitor (s), C close to the VIN pin as possible. This capacitor provides the AC current into the internal power MOSFETs. ...
Page 12
... RT8064 Outline Dimension EXPOSED THERMAL PAD (Bottom of Package) Symbol Option 1 Option 2 www.richtek.com Dimensions In Millimeters Min Max 4.801 5.004 3.810 4.000 1.346 1.753 0.330 0.510 1.194 1.346 0.170 0.254 0.000 0.152 5.791 6.200 0.406 1.270 X 2.000 2 ...
Page 13
... W-Type 8L DFN 3x3 Package Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com RT8064 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.028 ...