rt8011 Richtek Technology Corporation, rt8011 Datasheet

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rt8011

Manufacturer Part Number
rt8011
Description
4mhz, Synchronous Step-down Regulator
Manufacturer
Richtek Technology Corporation
Datasheet

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General Description
The RT8011/A is a high efficiency synchronous, step-down
DC/DC converter. Its input voltage range is from
5.5V and provides an adjustable regulated output voltage
from 0.8V to 5V while delivering up to 2A of output current.
The internal
switches increase efficiency and eliminate the need for
an external Schottky diode. Switching frequency is set
by an external resistor or can be synchronized to an
external clock. 100% duty cycle provides low dropout
operation extending battery life in portable systems.
Current mode operation with external compensation
allows the transient response to be optimized over a wide
range of loads and
RT8011/A operation in forced continuous PWM
minimizes ripple voltage and reduces the noise and RF
interference.
100% duty cycle in Low Dropout Operation further
maximize battery life.
Ordering Information
Note :
RichTek Pb-free and Green products are :
DS8011/A-00 August 2006
RT8011/A
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100% matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
synchronous low on-resistance power
Package Type
F : MSOP-10 (RT8011)
QW : WDFN-10L 3x3 (RT8011)
QW : WDFN-8E 3x3 (RT8011A)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Without SYNC and PGOOD Function
With SYNC and PGOOD Function
output capacitors.
cial Standard)
2A, 4MHz, Synchronous Step-Down Regulator
Mode which
2.6V to
Features
Applications
Pin Configurations
Marking Information
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
SHDN/RT
High Efficiency : Up to 95%
Low R
Programmable Frequency : 300kHz to 4MHz
No Schottky Diode Required
0.8V Reference Allows Low Output Voltage
Forced Continuous Mode Operation
Low Dropout Operation : 100% Duty Cycle
Synchronizable Switching Frequency (For RT8011
Only)
Power Good Output Voltage Monitor (For RT8011
Only)
RoHS Compliant and 100% Lead (Pb)-Free
Portable Instruments
Battery-Powered Equipment
Notebook Computers
Distributed Power Systems
IP Phones
Digital Cameras
PGND
SYNC
GND
LX
WDFN-10L 3x3
DS(ON)
SHDN/RT
1
2
3
4
5
PGND
SYNC
GND
LX
Internal Switches : 110mΩ Ω Ω Ω Ω
10
9
8
7
9
COMP
FB
PGOOD
VDD
PVDD
(TOP VIEW)
2
3
4
5
MSOP-10
SHDN/RT
10
9
8
7
6
PGND
RT8011/A
GND
LX
COMP
FB
PGOOD
VDD
PVDD
WDFN-8E 3x3
www.richtek.com
1
2
3
4
8
7
6
5
COMP
FB
VDD
PVDD
1

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rt8011 Summary of contents

Page 1

... Synchronous Step-Down Regulator General Description The RT8011 high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 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

... RT8011A R OSC 332k 8 1 SHDN/RT COMP 2 7 GND VDD 4 5 PGND PVDD L1 2.2uH Figure 2. Typical Application Circuit for RT8011A Inductance (uH) DCR (mΩ) Current Rating (mA) Dimensions (mm) 2.2 60 2.2 31.3 2.2 29 2.2 47 Part No. C3225X5R0J226M C3225X5R0J226M C2012X5R0J106M ECJ4YB0J226M ECJ4YB1A226M ECJ4YB1A106M LMK325BJ226ML JMK316BJ226ML JMK212BJ106ML C R COMP ...

Page 3

... R R2 COMP C COMP GND Connect the FB pin directly to feedback resistors. The resistor divider must be connected between V OUT GND. Figure 4. RT8011A Layout Guide Pin Function causes the device to be shut DD LX should be connected to OUT Inductor by wide and short trace, keep sensitive compontents away ...

Page 4

... OSC Com Output Clamp 0.9V Control Logic 0.7V 0.4V OTP V REF RT8011 SHDN/RT SD ISEN Slope OSC Com Output Clamp 0.9V Control Logic 0.7V 0.4V OTP V REF RT8011A PVDD OC Limit Driver LX NISEN PGND NMOS I Limit PGOOD GND OC Limit Driver NISEN NMOS I Limit DS8011/A-00 August 2006 PVDD LX PGND GND ...

Page 5

... R P-Channel and N-Channel power switches increases. The user should calculate the power dissipation when the RT8011/A is used at 100% duty cycle with low input voltages to ensure that thermal limits are not exceeded. Slope Compensation and Inductor Peak Current ...

Page 6

... RT8011/A Absolute Maximum Ratings Supply Input Voltage, VDD, PVDD ---------------------------------------------------------------------------- −0. Pin Switch Voltage -------------------------------------------------------------------------------------------- −0.3V to (PVDD + 0.3V) Other I/O Pin Voltages ------------------------------------------------------------------------------------------- −0.3V to (VDD + 0.3V) LX Pin Switch Current -------------------------------------------------------------------------------------------- 4A Power Dissipation 25° MSOP-10 ------------------------------------------------------------------------------------------------------------ 467mW WDFN-10L 3x3 ----------------------------------------------------------------------------------------------------- 909mW WDFN-8L 3x3 ------------------------------------------------------------------------------------------------------ 909mW Package Thermal Resistance (Note 4) MSOP-10, θ ...

Page 7

... Symbol Test Conditions R = 332k OSC Switching Frequency 0.5A PMOS 0.5A NMOS SW I LIM V Rising DD V Falling DD = 25° effective single layer thermal conductivity test board of A RT8011/A Min Typ Max Units 0.8 1 1.2 MHz 0 MHz 0 MHz -- 110 160 mΩ -- 110 170 mΩ 2.2 3 ...

Page 8

... RT8011/A Typical Operating Characteristics Efficiency vs. Output Current 100 5V 3.3V OUT 250 500 750 1000 1250 1500 1750 2000 2250 Output Current (mA) Frequency vs. Temperature 1100 V = 3.3V 1.8V IN OUT OUT 1080 1060 1040 1020 1000 -50 -25 ...

Page 9

... V OUT (50mV/Div (1A/Div) V OUT (10mV/Div (5V/Div (2A/Div) RT8011/A V vs. Input Voltage REF 3 3.25 3.5 3.75 4 4.25 4.5 4.75 Input Voltage (V) Load Transient Response V = 3.3V 2.5V IN OUT OUT Time (50μs/Div) Output Ripple 2.5V IN ...

Page 10

... RT8011/A Power Good V = 3.3V 2.5V IN OUT OUT V IN (2V/Div) PGOOD (2V/Div) V OUT (2V/Div (2A/Div) Time (1ms/Div) Power On & Inductor Current 2.5V IN OUT OUT V IN (2V/Div) V OUT (2V/Div (5V/Div (2A/Div) Time (1ms/Div) Soft Start and Inrush Current ...

Page 11

... Application Information The basic RT8011/A application circuit is shown in Typical Application Circuit. External component selection is determined by the maximum load current and begins with the selection of the inductor value and operating frequency followed by C and OUT Operating Frequency Selection of the operating frequency is a tradeoff between efficiency and component size ...

Page 12

... Figure best, this ringing can couple to the output IN large enough to damage the IN ⎛ + ⎞ × ⎜ ⎟ REF ⎝ ⎠ R2 equals to 0.8V typical. REF V OUT RT8011/A R2 GND Figure 6. Setting the Output Voltage DS8011/A-00 August 2006 ...

Page 13

... The junction temperature example, consider the RT8011/A in dropout at an input voltage of 3.3V, a load current of 2A and an ambient temperature of 70°C. From the typical performance graph of switch resistance, the R at 70°C is approximately 121mΩ. Therefore, power ...

Page 14

... VDD, VOUT, PGND, GND, or any other DC rail in your system). Connect the FB pin directly to the feedback resistors. The resistor divider must be connected between V and GND. www.richtek.com 14 to its steady-state value. can be monitored for , as IN OUT Figure 7. RT8011 Demo Board Figure 8. RT8011A Demo Board (Only WDFN-8E 3x3) DS8011/A-00 August 2006 ...

Page 15

... W-Type 8E DFN 3x3 Package, 0.5mm Lead Pitch RT8011 DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.028 0.031 0.000 0.002 0.007 0.010 0.007 ...

Page 16

... RT8011 Symbol www.richtek.com SEE DETAIL Dimensions In Millimeters Min Max 0.700 0.800 0.000 0.050 0.175 0.250 0.180 0.300 2.950 3.050 2.300 2.650 2.950 3.050 1.500 1.750 0.500 0.350 0.450 W-Type 10L DFN 3x3 Package ...

Page 17

... MSOP Plastic Package RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com RT8011/A L Dimensions In Inches Min Max 0.032 0.043 0.000 0.006 0.030 0.037 ...

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