RT9198/A
300mA, Low Noise, Ultra-Fast CMOS LDO Regulator
General Description Ordering Information
RT9198/A-
The RT9198/A is designed for portable RF and wireless
Package Type
applications with demanding performance and space
U5 : SC-70-5
requirements. The RT9198/A performance is optimized for
U5R : SC-70-5 (R-Type)
Y : SC-82
battery-powered systems to deliver ultra low noise and
V : SOT-23-3
low quiescent current. Regulator ground current increases
B : SOT- 23-5
only slightly in dropout, further prolonging the battery life.
BR : SOT- 23-5 (R-Type)
The RT9198/A also works with low-ESR ceramic
BG : SOT- 23-5 (G-Type)
J3 : TSOT- 23-3
capacitors, reducing the amount of board space necessary
J5 : TSOT- 23-5
for power applications, critical in hand-held wireless
J5R : TSOT- 23-5 (R-Type)
devices. The RT9198/A consumes less than 0.01uA in
J5G : TSOT- 23-5 (G-Type)
shutdown mode and has fast turn-on time less than 50us.
F : MSOP-8
QW : WDFN-6L 2x2 (W-Type)
The other features include ultra low dropout voltage, high
Lead Plating System
output accuracy, current limiting protection, and high ripple
P : Pb Free
rejection ratio. Available in the SOT-23-3, SOT-23-5,
G : Green (Halogen Free and Pb Free)
TSOT-23-3, TSOT-23-5, SC-70-5, SC-82, MSOP-8 and
Output Voltage
WDFN-6L 2x2 packages, the RT9198/A also offers a range
15 : 1.5V
from 1.5V to 5.0V with 0.1V per step.
16 : 1.6V
:
49 : 4.9V
Features
50 : 5.0V
z z z Low-Noise for RF Application
z z
1H : 1.85V
z z z Fast Response in Line/Load Transient
z z
2H : 2.85V
z z z Quick Start-Up (Typically 50us) 4G : 4.75V
z z
z z z < 0.01uA Standby Current When Shutdown
z z Chip Enable Function (Active Low)
Chip Enable Function (Active High)
z z z Low Dropout : 220mV @ 300mA
z z
Note :
z z z Wide Operating Voltage Ranges : 2.5V to 5.5V
z z
Richtek products are :
z z z TTL-Logic-Controlled Shutdown Input
z z
` RoHS compliant and compatible with the current require-
z z z Low Temperature Coefficient
z z
ments of IPC/JEDEC J-STD-020.
z z z Current Limiting Protection
z z
` Suitable for use in SnPb or Pb-free soldering processes.
z z z Thermal Shutdown Protection
z z
z z z Only 1uF Output Capacitor Required for Stability
z z
z z z High Power Supply Rejection Ratio Marking Information
z z
z z z Custom Voltage Available
z z
For marking information, contact our sales representative
z z z RoHS Compliant and 100% Lead (Pb)-Free
z z
directly or through a Richtek distributor located in your
area.
Applications
z CDMA/GSM Cellular Handsets
z Battery-Powered Equipment
z Laptop, Palmtops, Notebook Computers
z Hand-Held Instruments
z PCMCIA Cards
z Portable Information Appliances
DS9198/A-14 April 2011 www.richtek.com
1GND
RT9198/A
Pin Configurations
(TOP VIEW)
VOUT NC
VIN VOUT NC VOUT
VIN
5 4
5 4 5 4
3
23
23 23 2
VIN GND EN/EN
GND VIN GND VOUT
EN/EN NC GND EN/EN
TSOT-23-5/SOT-23-5/ TSOT-23-5/SOT-23-5/ TSOT-23-5/ TSOT-23-3/
SC-70-5 (R-Type) SC-70-5 SOT-23-5(G-Type) SOT-23-3
VIN VOUT
NC 8 EN/EN
4 3
EN/EN 1 6 NC
NC 2 7
NC
GND 2 5 NC 3
GND 6 NC
2
7
3 4 VIN 4 5
VIN VOUT VOUT
GND
EN/EN
WDFN-6L 2x2 MSOP-8 SC-82
Typical Application Circuit
RT9198
V VIN VOUT V
OUT
IN
C
IN
C
OUT
1uF
1uF
Chip Enable EN GND
On
Off
RT9198A
VIN VOUT V
V
IN OUT
C
IN
C
OUT
1uF
1uF
Chip Enable GND
EN
Off
On
www.richtek.com DS9198/A-14 April 2011
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