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PDF RT9206 Data sheet ( Hoja de datos )
| Número de pieza | RT9206 | |
| Descripción | Synchronous Buck | |
| Fabricantes | Richtek Technology Corporation | |
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RT9206
High Efficiency, Synchronous Buck with Dual Linear
Controllers
General Description
The RT9206 is a low cost, combo power controller, which
integrates a synchronous step-down voltage-mode PWM
and two HV linear controllers. Directly drive external
N-MOSFET makes it easy to implement a high efficiency
and cost attractive power solution. Voltage mode control
loop and constant operation frequency with external
compensation network provide better stability in wide
operation range. Adjustable operation frequency up to
600kHz can minimize the inductor size and PCB space. It
is particularly suitable in wide input voltage range (from
4.75V to 28V) and multi-output applications.
Linear controller features flexible linear power design.
Delivered power can be simply decided by external
N-MOSFET selection. Output voltage level is chosen via
external resistor divider. The 0.8V internal reference can
satisfy most of the applications. Under voltage lockout
provide cost effective protection of output.
RT9206 provides complete safety protection function: soft
start, over current protection, over voltage and under voltage
protection. Set current limit by choosing different MOSFET.
Synchronous Buck control mode provides excellent over
voltage protection by turning on low side MOSFET to
prevent any damage of end device from abnormal voltage
stress as over voltage condition occurs.
Ordering Information
RT9206
Package Type
S : SOP-16
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Note :
RichTek Pb-free and Green products are :
}RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
}Suitable for use in SnPb or Pb-free soldering processes.
}100%matte tin (Sn) plating.
Features
l Wide Input Range (4.75V to 28V)
l 0.8V Internal Reference
l High Efficiency Synchronous Buck Topology
l Integrate two HV Linear Controllers
l Low cost N-MOSFET Design
l Duty Cycle from 0% to 90%.
l Adjustable switching frequency from 200kHz to
600kHz, Default 200kHz
l Sense OCP by low Side MOSFET RDS(ON)
l Power Good Signal Output
l RoHS Compliant and 100% Lead (Pb)-Free
Applications
l LCD Monitor
l Desk Note
l IEEE1394 Client
l Desktop IA
l Broadband
Pin Configurations
(TOP VIEW)
LDRV1
VDD
LDRV2
LFB2
COMP
FB
PGOOD
SS/EN
16
2 15
3 14
4 13
5 12
6 11
7 10
89
SOP-16
LFB1
BOOT
UGATE
PHS
VINT
LGATE
GND
RT
DS9206-11 March 2007
www.richtek.com
1
www.DataSheet.in
1 page  
Pin Description
RT9206
LDRV1(Pin 1)
Linear controller 1 (LCTR1) driver. Connect to the gate of
external N-Channel MOSFET pass transistor to form a
positive linear regulator
VDD (Pin 2)
Input supply voltage
LDRV2 (Pin 3)
Linear controller 2 (LCTR2) driver. Connect to the gate of
external N-Channel MOSFET pass transistor to form a
positive linear regulator
LFB2 (Pin 4)
LDO2 feedback input. The feedback set point is 0.8V.
Connect to a resistive divider between the positive linear
regulator output and GND to adjust the output voltage.
COMP (Pin 5)
Switching regulator compensation pin.
FB (Pin 6)
Switching regulator feedback input. The feedback set point
is 0.8V. Connect to a resistive divider between the switching
regulator output and GND to adjust the output voltage.
PGOOD (Pin 7)
Open drain power good indicator. PGOOD is low when
switching regulator output voltage is lower than 10% of its
regulation voltage. Connect a pull high resistor between
PGOOD and switching regulator output for pull high logic
level voltage.
SS/EN (Pin 8)
Soft start input with 8uA sourcing current and IC enable
control.
RT (Pin 9)
Operational frequency setting. Connect a resistor between
RT and GND to set operational frequency. The operational
frequency will nominally run at 200kHz when open.
The formula between resistor setting and operational
frequency are as follows:
62 ×108
RRT = FOSC - 200 × 103
GND (Pin 10)
Ground
LGATE (Pin 11)
Low side gate driver. Drives low side N-MOSFET with a
voltage swing between VINT and GND
VINT (Pin 12)
Internal 6.0V regulator output. The low side gate driver and
control circuit and external bootstrap diode are powered
by this voltage. Decouple this pin to power ground with a
4.7uF or greater ceramic capacitor close to the VINT pin.
PHS (Pin 13)
Inductor connection with (-) terminal bootstrap flying
capacitor connection.
UGATE (Pin 14)
High side gate driver. Drives high side N-Channel MOSFET
with a voltage swing between BOOT and PHS
BOOT (Pin 15)
High side floating driver supply with (+) terminal bootstrap
flying capacitor connection. Voltage swing is from a diode
drop below VINT to VIN+VINT
LFB1 (Pin 16)
LDO1 feedback input. The feed back set point is 0.8V.
Connect to a resistive divider between the positive linear
regulator output and GND to adjust the output voltage.
DS9206-11 March 2007
www.DataSheet.in
www.richtek.com
5
5 Page 
RT9206
UGATE
Short Latch
VIN = 12V
20V/Div
VOUT1
IL
2V/Div
10A/Div
Time (20µs/Div)
Oscillator Frequency vs. Temperature
240
VIN = 12V
235 RT = floating
230
225
220
215
210
205
200
195
190
-50 -25 0 25 50 75 100 125 150
Temperature (°C)
POR(Rising/Falling) vs. Temperature
5
4.75
VIN = 12V
f = 200kHz
4.5
4.25
4
Rising
3.75
3.5
3.25
Falling
3
2.75
2.5
2.25
2
-50 -25
0
25 50 75 100 125 150
Temperature (°C)
DS9206-11 March 2007
Soft Start vs. Temperature
6.1
VIN = 12V
f = 200kHz
6.05
6
5.95
5.9
5.85
5.8
-50 -25 0 25 50 75 100 125 150
Temperature (°C)
0.82
0.815
Reference Voltage vs. Temperature
VIN = 12V
f = 200kHz
0.81
0.805
0.8
0.795
0.79
0.785
-50 -25 0 25 50 75 100 125 150
Temperature (°C)
Quiescent Current vs. Input Voltage
1055
VSS = 0V
1050
1045
1040
1035
1030
1025
0 4 8 12 16 20 24 28 32
VIN (V)
www.richtek.com
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11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet RT9206.PDF ] | |
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