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RT8289GSP

P1-P3P4-P6P7-P9P10-P12P13-P13
RT8289
®
DS8289-02 October 2014 www.richtek.com
1
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Ordering Information
Pin Configurations
(TOP VIEW)
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.
5A, 32V, 500kHz Step-Down Converter
Applications
Distributive Power Systems
LCD TV
DSL Modems
Pre-regulator for Linear Regulators
Battery Charger
Typical Application Circuit
SOP-8 (Exposed Pad)
General Description
The RT8289 is a step-down regulator with an internal Power
MOSFET. It achieves 5A of continuous output current over
a wide input supply range with excellent load and line
regulation. Current mode operation provides fast transient
response and eases loop stabilization.
The RT8289 provides protections such as cycle-by-cycle
current limiting and thermal shutdown. In shutdown mode,
the regulator draws 25μA of supply current.
The RT8289 requires a minimum number of external
components, to provide a compact solution.
The RT8289 is available in a SOP-8 (Exposed Pad)
package.
BOOT
NC
NC
FB
SW
VIN
EN
GND
GND
2
3
4
5
6
7
8
9
Features
High Output Current up to 5A
Internal Soft-Start
100m
ΩΩ
ΩΩ
Ω Internal Power MOSFET Switch
Internal Compensation Minimizes External Parts
Count
High Efficiency up to 90%
25
μμ
μμ
μA Shutdown Current
Fixed 500kHz Frequency
Thermal Shutdown Protection
Cycle-by-Cycle Over Current Protection
Wide 5.5V to 32V Operating Input Range
Adjustable Output Voltage from 1.222V to 26V
Available in an SOP-8 (Exposed Pad) Package
RoHS Compliant and Halogen Free
5V/5A
VIN
EN
GND
BOOT
FB
SW
5
4
7
8
1
L
10µH
10nF
47µFx2
R1
10k
R2
3.16k
V
OUT
4.7µF x 2
Chip Enable
V
IN
5.5V to 32V
RT8289
D
B550C
6, Exposed Pad (9)
C
BOOT
C
OUT
C
IN
Open
= Automatic Startup
(POSCAP)
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
RT8289
Lead Plating System
G : Green (Halogen Free and Pb Free)
RT8289GSP : Product Number
YMDNN : Date Code
RT8289
GSPYMDNN
Marking Information
RT8289
2
DS8289-02 October 2014www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Functional Pin Description
Function Block Diagram
Pin No. Pin Name Pin Function
1 BOOT
High Side Gate Drive Bootstrap Input. BOOT supplies the drive for the high side
N-MOSFET switch. Connect a 10nF or greater capacitor from SW to BOOT to
power the high side switch.
2, 3 NC No Internal Connection.
4 FB
Feedback Input. FB senses the output voltage to regulate said voltage. Drive FB
with a resistive voltage divider from the output voltage. The value of the divider
resistors also sets loop bandwidth. The feedback threshold is 1.222V.
5 EN
Chip Enable (Active High). EN is a digital input that turns the regulator on or off.
Drive EN higher than 1.4V to turn on the regulator, lower than 0.4V to turn it off.
For automatic startup, leave EN unconnected.
6,
9 (Exposed Pad)
GND
Ground. The exposed pad must be soldered to a large PCB and connected to
GND for maximum power dissipation.
7 VIN
Power Input. VIN supplies the power to the IC, as well as the step-down
converter switches. Drive V
IN
with a 5.5V to 32V power source. Bypass V
IN
to
GND with a suitably large capacitor to eliminate noise on the input to the IC.
8 SW
Power Switching Output. SW is the switching node that supplies power to the
output. Connect the output LC filter from SW to the output load. Note that a
capacitor is required from SW to BOOT to power the high side switch.
S
Q
R
Driver
Bootstrap
Control
-
+
Current Sense
Amplifier
PWM
Comparator
Oscillator
500kHz
Ramp
Generator
Regulator
Reference
+
-
12k
Error
Amplifier
30pF
400k
13pF
SW
BOOT
FB
EN
VIN
GND
+
-
OC Limit
Clamp
RT8289
3
DS8289-02 October 2014 www.richtek.com
©
Copyright 2014 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Electrical Characteristics
Parameter Symbol Test Conditions Min Typ Max Unit
Feedback Reference Voltage V
FB
5.5V ≦ V
IN
≦ 32V 1.202 1.222 1.239 V
High Side Switch-On Resistance R
DS(ON)1
-- 100 -- m
Low Side Switch-On Resistance R
DS(ON)2
-- 10 --
Upper Switch Leakage V
EN
= 0V, V
SW
= 0V -- 0 10 A
Current Limit I
LIM
Duty = 90%; V
BOOTSW
= 4.8V -- 6.8 -- A
Current Sense Transconductance G
CS
Output Current to V
COMP
-- 5.5 -- A/V
Oscillator Frequency f
SW
-- 500 -- kHz
Short Circuit Oscillation Frequency V
FB
= 0V -- 120 -- kHz
Maximum Duty Cycle D
MAX
V
FB
= 1V -- 90 -- %
Minimum On-Time t
ON
-- 100 -- ns
Under Voltage Lockout Threshold
Rising
-- 4.2 -- V
Under Voltage Lockout Threshold
Hysteresis
-- 200 -- mV
Logic Low Voltage V
IL
-- -- 0.4
En Threshold
Logic High Voltage V
IH
1.4 -- 5.5
V
Enable Pull Up Current -- 1 -- A
(V
IN
= 12V, T
A
= 25°C unless otherwise specified)
Absolute Maximum Ratings (Note 1)
Supply Voltage, V
IN
------------------------------------------------------------------------------------------ 0.3V to 34V
Switching Voltage, SW (Note 2) ------------------------------------------------------------------------ −0.6V to (V
IN
+ 0.3V)
BOOT Voltage ------------------------------------------------------------------------------------------------- (V
SW
− 0.3V) to (V
SW
+ 6V)
Other Pins Voltage ------------------------------------------------------------------------------------------- −0.3V to 6V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) -------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 3)
SOP-8 (Exposed Pad), θ
JA
--------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θ
JC
-------------------------------------------------------------------------------- 15°C/W
Junction Temperature ---------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------ 260°C
Storage Temperature Range ------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 4)
HBM (Human Body Model) --------------------------------------------------------------------------------- 2kV
MM (Machine Model) ---------------------------------------------------------------------------------------- 200V
Recommended Operating Conditions (Note 5)
Supply Voltage, V
IN
------------------------------------------------------------------------------------------ 5.5V to 32V
Enable Voltage, V
EN
----------------------------------------------------------------------------------------- 0V to 5.5V
Junction Temperature Range ------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------- −40°C to 85°C
P1-P3P4-P6P7-P9P10-P12P13-P13

RT8289GSP

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IC REG BUCK ADJUSTABLE 5A 8SOP
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