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PDF RT9277C Data sheet ( Hoja de datos )
| Número de pieza | RT9277C | |
| Descripción | Low Noise Boost Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9277C (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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RT9277C/D
High Performance, Low Noise Boost Converter
General Description
Features
The RT9277C/D is a high performance, low noise, fixed
frequency step up DC-DC Converter. The RT9277C/D
converters input voltage ranging 2.5V to 5.5V into output
voltage up to 16V. Current mode control with external
compensation network makes it easy to stabilize the
system and keep maximum flexibility. Soft start function
minimizes impact on the input power system. Internal power
MOSFET with very low RDS(ON) provides high efficiency.
The RT9277C/D with 640kHz and 1.2MHz operation
frequency options provide flexibiltity of minimum output
inductor size, maximum efficiency and low BOM cost.
z Efficiency up to 90%
z VIN Operating Range : 2.5V to 5.5V
z 1.6A, 0.2Ω, 16V Internal Power MOSFET
z 640kHz and 1.2MHz Operation Frequency
z External Compensation
z Internal/External Programmable Soft Start
z Small MSOP8 Package
z OCP and OTP Function are Included
z RoHS Compliant and Halogen Free
Applications
The RT9277C/D also provides comprehensive protection
functions such as UVLO, OCP and OTP.
Ordering Information
RT9277C/D
Package Type
F : MSOP-8
QW : WDFN-8L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
Note :
Soft Start Function
C : External Programmable
D : Internal Programmable
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.
z TFT LCD panel
z OLEDDisplay
z PCMCIA Cards
z Portable Device
Pin Configurations
(TOP VIEW)
COMP
FB
EN
GND
8
27
36
45
MSOP-8
SS
FREQ
VIN
LX
COMP 1
FB 2
EN 3
GND 4
8 SS
7 FREQ
6 VIN
9 5 LX
RT9277C
WDFN-8L 3x3
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
COMP
FB
EN
GND
8
27
36
45
MSOP-8
NC
FREQ
VIN
LX
COMP 1
FB 2
EN 3
GND 4
8 NC
7 FREQ
6 VIN
9 5 LX
RT9277D
WDFN-8L 3x3
DS9277C/D-01 April 2011
www.richtek.com
1
1 page  
RT9277C/D
Absolute Maximum Ratings (Note 1)
z Supply Voltage (VIN) ------------------------------------------------------------------------------------------------ −0.3 to 6V
z LX to GND ------------------------------------------------------------------------------------------------------------- − 0.3V to 16V
z The other pins -------------------------------------------------------------------------------------------------------- − 0.3V to 6V
z Power Dissipation, PD @ TA = 70°C
MSOP-8 --------------------------------------------------------------------------------------------------------------- 625mW
WDFN-8L 3x3 --------------------------------------------------------------------------------------------------------- 926mW
z Package Thermal Resistance (Note 2)
MSOP-8, θJA ---------------------------------------------------------------------------------------------------------- 160°C/W
WDFN-8L 3x3, θJA --------------------------------------------------------------------------------------------------- 108°C/W
WDFN-8L 3x3, θJC --------------------------------------------------------------------------------------------------- 7.5W
z Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
z Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------- 260°C
z Storage Temperature Range --------------------------------------------------------------------------------------- − 65°C to 150°C
z ESD Susceptibility (Note 3)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 4)
z Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
z Ambient Temperature Range -------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VIN = 3V, FREQ left floating, TA = 25°C, Unless Otherwise specification)
Parameter
Symbol
Test Conditions
System Supply Input
Operation voltage Range
Under Voltage Lock Out
VIN
UVLO
Power On Reset Hysteresis
Quiescent Current
IQ
Shut Down Current
ISH DN
Soft start Current (RT9277C) ISS
Switching Regulator Oscillator
VFB = 1.3V, No switching
VFB = 1.0V, Switching, No load
EN = GND
VSS = 1.2V
Free Run Frequency
Maximum Duty Cycle
fOSC
FREQ = GND
FREQ = VIN
Reference Voltage
Feedback Reference Voltage VREF
VCOMP = 1.24V
Min Typ Max Unit
2.5 -- 5.5 V
1.9 2 2.1 V
-- 100 -- mV
-- 250 500 μA
-- 2 5 mA
-- -- 1 μA
1.5 4 7 μA
540 640 740
kHz
--
1200
--
82 90 96 %
1.227
1.24 1.253 V
To be continued
DS9277C/D-01 April 2011
www.richtek.com
5
5 Page 
RT9277C/D
R3
=
200
×
VOUT 2
L1
×
C2
C3
=
0.4 ×10-3
VIN
× L1
C4 = 0.005 × RESR × L1
VOUT 2
The best criterion to optimize the loop compensation is
by inspecting the transient response and adjusting the
compensation network.
Soft-Start Capacitor
The soft-start function begins from VSS = 0V to 1.24V with
a 4μA constant current charging to the soft-start capacitor,
so the capacitor should be large enough for the output
voltage to reach regulation inside the soft-start cycle.
Typical value of soft-start capacitor range is from 10nF to
200nF.
Layout Consideration
For best performance of the RT9277C/D, the following
guidelines must be strictly followed.
` Input and Output capacitors should be placed close to
the IC and connected to ground plane to reduce noise
coupling.
` The GND and Exposed Pad should be connected to a
strong ground plane for heat sinking and noise protection.
` Keep the main current traces as possible as short and
wide.
` LX node of DC/DC converter is with high frequency
voltage swing. It should be kept at a small area.
` Place the feedback and compensation components as
close as possible to the IC and keep away from the
noisy devices.
Place feedback (R1, R2) and compensation
( R 3 , C 3 , C 4 ) components as close as
possible to the IC and keep away from the
noisy devices.
GND
R2
R1
AVDD
C3
R3 C4
COMP
FB
EN
GND
1
2
3
4
C5 LX node of DC/DC converter
is with high frequency voltage
8
7
SS
FREQ
swing. It should be kept at a
small area.
6 VIN L1 VIN
5 LX
C2 D1
AVDD
C1
GND
The GND should be connected to a
strong ground plane for heat sinking
and noise protection.
Input and Output capacitors should be
placed close to the IC and connected to
ground plane to reduce noise coupling.
Figure 3. PCB Layout Guide
DS9277C/D-01 April 2011
www.richtek.com
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet RT9277C.PDF ] | |
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