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RT8292ALGSP

P1-P3P4-P6P7-P9P10-P12P13-P14
RT8292A
®
DS8292A-04 October 2016 www.richtek.com
1
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Design
Tools
Sample &
Buy
Ordering Information
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.
Pin Configurations
(TOP VIEW)
Applications
Wireless AP/Router
Set-Top-Box
Industrial and Commercial Low Power Systems
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation of High-Performance DSPs
SOP-8 (Exposed Pad)
2A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8292A is a high efficiency, monolithic synchronous
step-down DC/DC converter that can deliver up to 2A
output current from a 4.5V to 23V input supply. The
RT8292A'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. The RT8292A also provides under
voltage protection and thermal shutdown prptection. The
low current (<3μA) shutdown mode provides output
disconnection, enabling easy power management in
battery-powered systems. The RT8292A is available in
an SOP-8 (Exposed Pad) package.
Features
±±
±±
±1.5% High Accuracy Feedback Voltage
4.5V to 23V Input Voltage Range
2A Output Current
Integrated N-MOSFET Switches
Current Mode Control
Fixed Frequency Operation : 340kHz
Output Adjustable from 0.8V to 20V
Up to 95% Efficiency
Programmable Soft-Start
Stable with Low-ESR Ceramic Output Capacitors
Cycle-by-Cycle Over Current Protection
Input Under Voltage Lockout
Output Under Voltage Protection
Thermal Shutdown Protection
RoHS Compliant and Halogen Free
BOOT
VIN
SW
GND
SS
EN
FB
COMP
GND
2
3
4
5
6
7
8
9
Marking Information
RT8292AxGSP : Product Number
x : H or L
YMDNN : Date Code
RT8292AxZSP : Product Number
x : H or L
YMDNN : Date Code
RT8292Ax
GSPYMDNN
RT8292Ax
ZSPYMDNN
RT8292AxGSP
RT8292AxZSP
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
RT8292A
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
RT8292A
2
DS8292A-04 October 2016www.richtek.com
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Pin No. Pin Name Pin Function
1 BOOT
Bootstrap for High Side Gate Driver. Connect a 0.1F or greater ceramic
capacitor from BOOT to SW pins.
2 VIN
Input Supply Voltage, 4.5V to 23V. Must bypass with a suitably large ceramic
capacitor.
3 SW Phase Node. Connect this pin to an external L-C filter.
4,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
5 FB
Feedback Input pin. 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.
6 COMP
Compensation Node. COMP is used to compensate the regulation control
loop. Connect a series RC network from COMP to GND. In some cases, an
additional capacitor from COMP to GND is required.
7 EN
Enable Input Pin. A logic high enables the converter; a logic low forces the
RT8292A into shutdown mode reducing the supply current to less than 3A.
Attach this pin to VIN with a 100k pull up resistor for automatic startup.
8 SS
Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor
from SS to GND to set the soft-start period. A 0.1F capacitor sets the
soft-start period to 13.5ms.
Typical Application Circuit
V
OUT
(V) R1 (k) R2 (k) R
C
(k) C
C
(nF) L (H) C
OUT
(F)
8 27 3 27 3.3 22 22 x 2
5 62 11.8 20 3.3 15 22 x 2
3.3 75 24 13 3.3 10 22 x 2
2.5 25.5 12 9.1 3.3 6.8 22 x 2
1.5 10.5 12 4.7 3.3 3.6 22 x 2
1.2 12 24 3.6 3.3 3.6 22 x 2
1 3 12 3 3.3 2 22 x 2
VIN
EN
GND
BOOT
FB
SW
7
5
2
3
1
L
10µH
100nF
22µF x 2
R1
75k
R2
24k
V
OUT
3.3V/2A
10µF
V
IN
4.5V to 23V
RT8292A
SS
8
C
SS
COMP
C
C
3.3nF
R
C
13k
C
P
Open
6
4, 9 (Exposed Pad)
C
BOOT
C
IN
0.1µF
C
OUT
R
EN
100k
Table 1. Recommended Component Selection
RT8292A
3
DS8292A-04 October 2016 www.richtek.com
©
Copyright 2016 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Function Block Diagram
VA
+
-
+
-
+
-
UV
Comparator
Oscillator
Foldback
Control
0.4V
Internal
Regulator
+
-
2.7V
Shutdown
Comparator
Current Sense
Amplifier
BOOT
VIN
GND
SW
FB
EN
COMP
3V
5k
VA
V
CC
6µA
Slope Comp
Current
Comparator
+
-
EA
0.8V
S
R
Q
Q
SS
+
-
1.2V
Lockout
Comparator
V
CC
+
130m
130m
P1-P3P4-P6P7-P9P10-P12P13-P14

RT8292ALGSP

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IC REG BUCK ADJUSTABLE 2A 8SOP
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