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PDF RT8299 Data sheet ( Hoja de datos )
| Número de pieza | RT8299 | |
| Descripción | 500kHz Synchronous Step-Down Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT8299 (archivo pdf) en la parte inferior de esta página. Total 15 Páginas | ||
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RT8299
3A, 24V, 500kHz Synchronous Step-Down Converter
General Description
The RT8299 is a high efficiency, monolithic synchronous
step-down DC/DC converter with internal power MOSFETs.
It achieves 3A of continuous output current over a wide
input supply range from 3V to 24V with excellent load and
line regulation. Current mode operation provides fast
transient response and eases loop stabilization. Cycle-
by-cycle current limit provides protection against shorted
outputs and soft-start eliminates input current surge during
start-up. Thermal shutdown provides reliable, fault tolerant
operation. The low current shutdown mode provides output
disconnection, enabling easy power management in battery
powered systems.
Ordering Information
RT8299
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
QW: WDFN-10L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Z : ECO (Ecological Element with
Halogen Free and Pb free)
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.
Features
z 3V to 24V Input Voltage Range
z 3A Output Current
z Internal N-MOSFETs
z Current Mode Control
z Fixed Frequency Operation : 500kHz
z Output Adjustable from 0.8V to 15V
z Up to 95% Efficiency
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 SOP-8 (Exposed Pad) and 10-Lead WDFN Packages
z RoHS Compliant and Halogen Free
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
Green Electronics/Applianceshttp://www.DataSheet4U.net/
z
z Point of Load Regulation for High Performance DSPs,
FPGAs, and ASICs
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
VCC
PGOOD
EN
FB
SOP-8 (Exposed Pad)
FB 1
PGOOD 2
EN 3
VCC 4
BOOT 5
10 GND
9 SW
8 SW
7 VIN
11 6 VIN
WDFN-10L 3x3
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8299-01 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
datasheet pdf - http://www.DataSheet4U.net/
1 page  
RT8299
Parameter
Power Good Threshold
VCC Regulator
VCC Load Regulation
Soft-Start Period
Thermal Shutdown
Symbol
Test Conditions
VOUT Rising, with Respect to VFB
VOUT Falling, with Respect to VFB
ICC = 5mA
tSS
TSD
Min Typ Max Unit
-- 90 --
%
-- 70 --
-- 5 -- V
-- 5 -- %
-- 2 -- ms
-- 150 --
°C
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2. θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
http://www.DataSheet4U.net/
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8299-01 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
RT8299
for ripple current rating and long term reliability
considerations. Ceramic capacitors have excellent low
ESR characteristics but can have a high voltage coefficient
and audible piezoelectric effects. The high Q of ceramic
capacitors with trace inductance can also lead to significant
ringing.
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them ideal
for switching regulator applications. However, care must
be taken when these capacitors are used at input and
output. When a ceramic capacitor is used at the input
and the power is supplied by a wall adapter through long
wires, a load step at the output can induce ringing at the
input, VIN. At best, this ringing can couple to the output
and be mistaken as loop instability. At worst, a sudden
inrush of current through the long wires can potentially
cause a voltage spike at VIN large enough to damage the
part.
Checking Transient Response
The regulator loop response can be checked by looking
at the load transient response. Switching regulators take
several cycles to respond to a step in load current. When
a load step occurs, VOUT immediately shifts by an amount
equal to ΔILOAD (ESR) also begins to charge or discharge
COUT generating a feedback error signal for the regulator
to return VOUT to its steady-state value. During this
recovery time, VOUT can be monitored for overshoot or
ringing that would indicate a stability problem.
EMI Consideration
Since parasitic inductance and capacitance effects in PCB
circuitry would cause a spike voltage on SW pin when
high side MOSFET is turned-on/off, this spike voltage on
SW may impact on EMI performance in the system. In
order to enhance EMI performance, there are two methods
to suppress the spike voltage. One is to place an R-C
snubber between SW and GND and make them as close
as possible to the SW pin (see Figure 5). Another method
is adding a resistor RBOOT* in series with the bootstrap
capacitor, CBOOT. But this method will decrease the driving
capability to the high side MOSFET. It is strongly
recommended to reserve the R-C snubber during PCB
layout for EMI improvement. Moreover, reducing the SW
trace area and keeping the main power in a small loop will
be helpful on EMI performance. For detailed PCB layout
guide,http://www.DataSheet4U.net/ please refer to the section of Layout Consideration.
RBOOT*
VIN
VIN
CIN
BOOT
CBOOT
REN* 10µF x 2
RT8299
L
SW
CEN*
EN
RS*
CS*
VCC
FB
CR
GND
PGOOD
100k
VCC
* : Optional
VOUT
R1
COUT
R2
Figure 5. Reference Circuit with Snubber and Enable Timing Control
Copyright ©2012 Richtek Technology Corporation. All rights reserved.
DS8299-01 May 2012
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
11
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet RT8299.PDF ] | |
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