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  Richtek Technology Electronic Components Datasheet  

RT8296B Datasheet

1.2MHz Synchronous Step-Down Converter

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RT8296B pdf
RT8296B
3A, 23V, 1.2MHz Synchronous Step-Down Converter
General Description
Features
The RT8296B is a high-efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 3A
output current from a 4.5V to 23V input supply. The
RT8296B's current mode architecture and external
compensation allow the transient response to be
optimized over a wide range of loads and output capacitors.
Cycle-by-cycle current limit provides protection against
shorted outputs and soft-start eliminates input current
surge during start-up. Fault conditions also include output
under voltage protection and thermal shutdown protection.
The low current (<3μA) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT8296B is available in
an SOP-8 (Exposed Pad) package.
Ordering Information
RT8296B
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
H : UVP Hiccup
L : UVP Latch-Off
z ±1.5% High Accuracy Feedback Voltage
z 4.5V to 23V Input Voltage Range
z 3A Output Current
z Integrated N-MOSFET Switches
z Current Mode Control
z Fixed Frequency Operation : 1.2MHz
z Adjustable Output from 0.8V to 15V
z Up to 95% Efficiency
z Programmable Soft-Start
z Stable with Low-ESR Ceramic Output Capacitors
z Cycle-by-Cycle Over Current Protection
z Input Under Voltage Lockout
z Output Under Voltage Protection
z Thermal Shutdown Protection
z RoHS Compliant and Halogen Free
Applications
z External Storage Device
z Wireless AP/Router
z Set-Top-Boxhttp://www.DataSheet4U.net/
z Industrial and Commercial Low Power Systems
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation of High-Performance DSPs
Note :
Richtek 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.
Marking Information
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
SS
EN
COMP
FB
RT8296BxGSP
RT8296Bx
GSPYMDNN
RT8296BxGSP : Product Number
x : H or L
YMDNN : Date Code
SOP-8 (Exposed Pad)
RT8296BxZSP
RT8296Bx
ZSPYMDNN
RT8296BxZSP : Product Number
x : H or L
YMDNN : Date Code
DS8296B-03 March 2011
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/


  Richtek Technology Electronic Components Datasheet  

RT8296B Datasheet

1.2MHz Synchronous Step-Down Converter

No Preview Available !

RT8296B pdf
RT8296B
Typical Application Circuit
VIN
4.5V to 23V
CSS
0.1µF
CIN
10µF x 2
REN 100k
2 VIN
BOOT 1
RT8296B
SW 3
7 EN
8 SS
FB 5
4, 9 (Exposed Pad)
GND
COMP 6
CBOOT L
100nF 3.6µH
CC
2.2nF
RC
22k
R1
75k
R2
24k
VOUT
3.3V/3A
COUT
22µF x 2
VOUT (V)
8
5
3.3
2.5
1.5
1.2
1
Table 1. Recommended Component Selection
R1 (k) R2 (k) RC (k) CC (nF) L (µH)
27 3 51 2.2 10
62 11.8 33 2.2 6.8
75 24 22 2.2 3.6
25.5 12 16 2.2 3.6
10.5 12
10 2.2
2
12 24 8.2 2.2
2
3 12 6.8 2.2 2
CP
Open
COUT (µF)
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
22 x 2
Functional Pin Description
Pin No.
1
2
Pin Name
BOOT
VIN
http://www.DataSheet4U.net/
Pin Function
Bootstrap for High Side Gate Driver. Connect a 0.1µF or greater ceramic
capacitor from BOOT to SW pins.
Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large ceramic
capacitor.
3 SW Switch Node. Connect this pin to an external L-C filter.
4, GND
9 (Exposed Pad)
5 FB
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
Feedback Input. This pin is connected to the converter output. It is used to set
the output of the converter to regulate to the desired value via an internal
resistive voltage divider. For an adjustable output, an external resistive
voltage divider is connected to this pin.
Compensation Node. COMP is used to compensate the regulation control
6
COMP
loop. Connect a series RC network from COMP to GND. In some cases, an
additional capacitor from COMP to GND is required.
Chip Enable (Active High). A logic-low forces the RT8296B into shutdown
7 EN mode reducing the supply current to less than 3µA. Attach this pin to VIN with
a 100kpull up resistor for automatic startup.
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
8 SS from SS to GND to set the soft-start period. A 0.1µF capacitor sets the
soft-start period to 13.5ms.
www.richtek.com
2
DS8296B-03 March 2011
datasheet pdf - http://www.DataSheet4U.net/


Part Number RT8296B
Description 1.2MHz Synchronous Step-Down Converter
Maker Richtek
Total Page 15 Pages
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RT8296B pdf
RT8296B Datasheet PDF
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