rt8065 Richtek Technology Corporation, rt8065 Datasheet

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rt8065

Manufacturer Part Number
rt8065
Description
3a, 2mhz, Synchronous Step-down Converter
Manufacturer
Richtek Technology Corporation
Datasheet

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Manufacturer
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Part Number:
rt8065ZQW
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
Part Number:
rt8065ZQW
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Part Number:
rt8065ZSP
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RICHTEK/立锜
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3A, 2MHz, Synchronous Step-Down Converter
General Description
The RT8065 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 0.8V to 5V while delivering up to 3A of output current.
The internal synchronous low on-resistance power
switches increase efficiency and eliminate the need for
an external Schottky diode. The default switching
frequency is set at 2MHz, if the RT pin is left open. It can
also be varied from 200kHz to 2MHz by adding an external
resistor. Current mode operation with external
compensation allows the transient response to be
optimized over a wide range of loads and output capacitors.
The RT8065 operates in forced continuous PWM Mode,
which minimizes ripple voltage and reduces the noise and
RF interference.
Ordering Information
Note :
Richtek products are :
Marking Information
RT8065ZSP
RT8065ZQW
DS8065-03 March 2011
RT8065
RT8065
ZSPYMDNN
ments of IPC/JEDEC J-STD-020.
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
29 YM
DNN
Lead Plating System
Z : ECO (Ecological Element with
Package Type
SP : SOP-8 (Exposed Pad-Option 2)
QW : WDFN-8L 3x3 (W-Type)
Halogen Free and Pb free)
29 : Product Code
YMDNN : Date Code
RT8065ZSP : Product Number
YMDNN : Date Code
Features
Applications
Pin Configurations
High Efficiency : Up to 95%
Adjustable Frequency : 200kHz to 2MHz
No Schottky Diode Required
0.8V Reference Allows Low Output Voltage
Forced Continuous Mode Operation
Low Dropout Operation : 100% Duty Cycle
Enable Function
External Soft-Start
Power Good Function
RoHS Compliant and Halogen Free
LCD TV and Monitor
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
COMP
VIN
COMP
EN
SS
SOP-8 (Exposed Pad)
VIN
EN
SS
WDFN-8L 3x3
(TOP VIEW)
1
2
3
4
2
3
4
GND
9
9
8
7
6
5
6
8
7
5
PGOOD
FB
RT
LX
PGOOD
FB
RT
LX
RT8065
www.richtek.com
1

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rt8065 Summary of contents

Page 1

... Synchronous Step-Down Converter General Description The RT8065 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

... Functional Pin Description Pin No. SOP-8 WDFN-8L 3x3 (Exposed Pad (Exposed Pad) 9 (Exposed Pad) GND www.richtek.com 2 RT8065 VIN C IN 10µ PGOOD R COMP R 1 OSC 6 COMP RT 9 (Exposed Pad) GND ...

Page 3

... Function Block Diagram COMP 0. Enable DS8065-03 March 2011 RT SD Slope OSC Com Output EA Clamp 10µA Hiccup Control Logic 0.7V P-G OTP 0.4V UV PGOOD ISEN OC Limit Driver NISEN N-MOSFET I LIM RT8065 VIN LX GND www.richtek.com 3 ...

Page 4

... RT8065 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. DS8065-03 March 2011 Symbol Test Conditions V V Rising 10nF 25° high effective thermal conductivity four-layer test board of A RT8065 Min Typ Max Unit − 0.7 V − 0 μs -- 800 -- -- 87 ...

Page 6

... RT8065 Typical Operating Characteristics Efficiency vs. Output Current 100 5V 0.5 1 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 1 Output Current (A) Switching Frequency vs. Temperature 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0. 330kΩ ...

Page 7

... Falling 0.9 0.8 0.7 0.6 -50 - Temperature (°C) Load Transient Response V OUT I OUT V = 5V, V (1A/Div) IN OUT R = 33kΩ, C COMP Time (100μs/Div) Switching V LX (5V/Div) V OUT Time (500ns/Div) RT8065 50 75 100 125 = 3.3V 3A, OUT = 560pF COMP = 3.3V OUT OUT www.richtek.com 7 ...

Page 8

... RT8065 Power On from (5V/Div) V OUT (1V/Div) V PGOOD (10V/Div) I OUT (2A/Div 5V 1.1V 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 (5V/Div) V OUT (1V/Div) V PGOOD (10V/Div) I OUT ...

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 (k ) Ω Figure 2. Switching Frequency vs. RT Resistor RT8065 1500 1800 2100 www.richtek.com 9 ...

Page 10

... P D(MAX) where T the ambient temperature, and θ thermal resistance. For recommended operating condition specifications of the RT8065, the maximum junction temperature is 125°C and T thermal resistance, θ SOP-8 (Exposed Pad) packages, the thermal resistance, θ JA thermal test board. For WDFN-8L 3x3 packages, the thermal resistance, θ ...

Page 11

... Ambient Temperature (°C) Figure 3. Derating Curve for the RT8065 Package DS8065-03 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

... RT8065 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 RT8065 2 1 DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.028 ...

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