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PDF RT9276 Data sheet ( Hoja de datos )
| Número de pieza | RT9276 | |
| Descripción | Synchronous Boost Converter | |
| Fabricantes | Richtek | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de RT9276 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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®
RT9276
Synchronous Boost Converter with Voltage Detector
General Description
Features
The RT9276 is a synchronous boost converter, which is
based on a fixed frequency Pulse-Width-Modulation
(PWM) controller using a synchronous rectifier to obtain
maximum efficiency. The converter provides a power
supply solution for products powered by a variety of
batteries such as single cell, dual cell alkaline, NiMH and
NiCd battery. At light load currents, the converter enters
power save mode to maintain a high efficiency over a wide
load current range.
The output voltage can be programmed by an external
resistor divider, or fixed at a certain voltage. Moreover, the
converter can be disabled to minimize battery drain. During
shutdown, the load is completely disconnected from the
battery. The maximum peak current in the boost switch
is limited to 2A for current limit.
For the RT9276, a low-EMI mode is implemented to reduce
ringing of the inductor phase pin when the converter enters
discontinuous conduction mode. Moreover, a voltage
detector is built-in in the chip for low battery detection.
z True Load Disconnection During Shutdown
z Internal Synchronous Rectifier
z Up to 96% Efficiency
z Current Mode PWM Operation with Internal
Compensation
z Low Start-Up Voltage
z Low Quiescent Current
z Internal Soft-Start Control
z Low Battery Comparator
z Low EMI Converter (Anti-Ringing)
z Power Save Mode for Improved Efficiency at Light
Load Current
z Over Current Protection
z Short Circuit Protection
z Over Temperature Protection
z Over Voltage Protection
z Small WDFN-10L 3x3 Package
z RoHS Compliant and Halogen Free
Applications
Ordering Information
RT9276(- )
Package Type
QW : WDFN-10L 3x3 (W-Type)
z All One-Cell, Two-Cell and Three-Cell Alkaline, NiCd,
NiMH and Single-Cell Li Batteries
z Hand-Held Devices
z WLED Flash Light
Note :
Lead Plating System
G : Green (Halogen Free and Pb Free)
Boost VOUT
Default : Adjustable
33 : 3.3V
50 : 5.0V
Pin Configurations
(TOP VIEW)
EN 1
VOUT 2
FB/NC 3
LBO 4
GND 5
10 PGND
9 LX
8 PGOOD
7 LBI
11 6 VBAT
Richtek products are :
WDFN-10L 3x3
` 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
EW= : Product Code
EW=YM
DNN
YMDNN : Date Code
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9276-02 July 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1
1 page  
RT9276
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Protection
Over-Temperature Protection
Over-Temperature Hysteresis
Over-Current Protection
Over-Voltage Protection
Power MOSFET
N-MOSFET ON-Resistance
P-MOSFET ON-Resistance
Enable Control
T OTP
T OTP_Hys
IOCP
VOV P
VOUT = 3.3V
VOUT = 3.3V
RDS(ON)_N
VOUT = 5V
VOUT = 3.3V
RDS(ON)_P
VOUT = 5V
-- 170 -- °C
-- 40 -- °C
1.6 2 2.4 A
5.4 -- 6 V
-- 220 --
mΩ
-- 200 --
-- 260 --
mΩ
-- 240 --
EN Threshold
Voltage
Logic-High
Logic-Low
Voltage Detector
LBI Voltage Threshold
LBI Voltage Hysteresis
LBO Output Impedance
VIH Rising
VIL Falling
VLBI_Ris ing
VLBI_Hys
RON_LBO VLBI = 0V, VOUT = 3.3V
0.8 --
--
V
-- -- 0.2
0.49 0.5 0.51 V
-- 10 -- mV
-- 15 -- Ω
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.
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS9276-02 July 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
5
5 Page 
Outline Dimension
RT9276
D2
D
L
E E2
SEE DETAIL A
1
eb
A
A3
A1
21
21
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
A
A1
A3
b
D
D2
E
E2
e
L
Dimensions In Millimeters
Min Max
0.700
0.800
0.000
0.050
0.175
0.250
0.180
0.300
2.950
3.050
2.300
2.650
2.950
3.050
1.500
1.750
0.500
0.350
0.450
Dimensions In Inches
Min
0.028
Max
0.031
0.000
0.002
0.007
0.010
0.007
0.012
0.116
0.120
0.091
0.116
0.104
0.120
0.059
0.069
0.020
0.014
0.018
W-Type 10L DFN 3x3 Package
Richtek Technology Corporation
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
DS9276-02 July 2013
www.richtek.com
11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet RT9276.PDF ] | |
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