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PDF RT9187 Data sheet ( Hoja de datos )
| Número de pieza | RT9187 | |
| Descripción | Ultra-Fast CMOS LDO Regulator | |
| Fabricantes | Richtek Technology | |
| Logotipo |  |
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RT9187www.DataSheet4U.com
1A, Ultra-Low Dropout, Ultra-Fast CMOS LDO Regulator
General Description
Features
The RT9187 is a high-performance, 1A LDO regulator,
offering extremely high PSRR and ultra-low dropout. Ideal
for portable RF and wireless applications with demanding
performance and space requirements.
A noise reduction pin is also available for further reduction
of output noise. Regulator ground current increases only
slightly in dropout, further prolonging the battery life. The
RT9187 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices.
Ultra-Low-Noise for RF Application
Ultra-Fast Response in Line/Load Transient
Quick Start-Up (Typically 40μs)
< 0.1uA Standby Current When Shutdown
Low Dropout : 240mV at 1A
Wide Operating Voltage Ranges : 2.5V to 5.5V
TTL-Logic-Controlled Shutdown Input
Current Limiting Protection
Thermal Shutdown Protection
Only 2.2uF Output Capacitor Required for Stability
High Power Supply Rejection Ratio
The RT9187 consumes less than 0.1uA in shutdown mode
RoHS Compliant and 100% Lead (Pb)-Free
and has fast turn-on time less than 40μs. The other features
include ultra-low dropout voltage, high output accuracy,
Applications
current limiting protection, and high ripple rejection ratio.
CDMA/GSM Cellular Handsets
Available in the VDFN-8L 3x3 and SOP-8 (Exposed Pad)
Battery-Powered Equipment
package.
Laptop, Palmtops, Notebook Computers
Ordering Information
RT9187(- )
Package Type
QV : VDFN-8L 3x3 (V-Type)
Hand-Held Instruments
Mini PCI & PCI-Express Cards
PCMCIA & New Cards
Portable Information Appliances
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
Marking Information
P : Pb Free with Commercial Standard For marking information, contact our sales representative
G : Green (Halogen Free with Commer-
cial Standard)
directly or through a RichTek distributor located in your
area, otherwise visit our website for detail.
None : Adjustable Output
Fixed Output Voltage Code
10 : 1.0V
11 : 1.1V
Pin Configurations
(TOP VIEW)
:
32 : 3.2V
33 : 3.3V
1L : 1.34V
VIN 1
VIN 2
VOUT 3
VOUT 4
8 EN
7 NC
6 GND
9 5 BP/ADJ
Note :
Richtek Pb-free and Green 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.
`100% matte tin (Sn) plating.
VDFN-8L 3x3
VIN
VIN
VOUT
VOUT
8
27
3
GND
9
6
45
EN
NC
GND
BP/ADJ
SOP-8 (Exposed Pad)
DS9187-09 April 2008
www.richtek.com
1
1 page  
RT9187www.DataSheet4U.com
Parameter
Symbol
Test Conditions
Min Typ Max Units
Power Supply
Rejection Rate
f = 100Hz
f = 10kHz
P SR R
IOUT = 300mA
-- −60 --
dB
-- −50 --
Line Regulation
ΔVLINE
VIN = (VOUT+0.5) to 5.5V,
IOUT = 1mA
-- -- 0.3 %
Start-Up Time
TStart_Up RLOAD = 3Ω, 1nF ≤ CBP ≤ 0.1μF
--
40
--
μs
Thermal Shutdown Temperature TSD
Thermal Shutdown Hysteresis
ΔTSD
-- 170 --
°C
-- 30 --
ADJ
Reference Voltage Tolerance
ADJ Pin Current
V REF
IA DJ
VADJ = VREF
0.78 4
--
0.8 0.816
10 100
V
nA
Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. 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 for extended periods may
remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution is recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV.
Note 5. Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load
regulation in the load range from 10mA to 1.0A.
Note 6. Quiescent, or ground current, is the difference between input and output currents. It is defined by IQ = IIN - IOUT under no
load condition (IOUT = 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
current.
Note 7. Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown signal (VEN
>1.8V ).
Note 8. Performance at -5°C ≤ TA ≤ 85°C is assured by design.
Note 9. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
DS9187-09 April 2008
www.richtek.com
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet RT9187.PDF ] | |
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