Document
RT9198T
300mA, Thermal Folded Back CMOS LDO Regulator
General Description
Features
The RT9198T is designed for portable RF and wireless z Short Circuit Thermal Folded Back Protection
applications with demanding performance and space z Low-Noise for RF Application
requirements. The RT9198T performance is optimized for z Fast Response in Line/Load Transient
battery-powered systems to deliver ultra low noise and z Quick Start-Up (Typically 50us)
low quiescent current. Regulator ground current increases z < 0.01uA Standby Current When Shutdown
only slightly in dropout, further prolonging the battery life. z Low Dropout : 220mV @ 300mA
The RT9198T also works with low-ESR ceramic capacitors, z Wide Operating Voltage Ranges : 2.5V to 5.5V
reducing the amount of board space necessary for power z TTL-Logic-Controlled Shutdown Input
applications, critical in hand-held wireless devices. The z Low Temperature Coefficient
RT9198T consumes less than 0.01uA in shutdown mode z Current Limiting Protection
and has fast turn-on time less than 50μs. RT9198T is short circuit thermal folded back protected. RT9198T lowers its
z Thermal Shutdown Protection z Only 1uF Output Capacitor Required for Stability
OTP trip point from 165°C to 110°C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users. The other features include ultra low dropout
z High Power Supply Rejection Ratio z Custom Voltage Available z RoHS Compliant and 100% Lead (Pb)-Free
voltage, high output accuracy, current limiting protection, and high ripple rejection ratio. Available in the SOT-23-3, SOT-23-5 and SC-70-5 packages, the RT9198T also offers a range of 1.5V to 3.5V with 0.1V per step.
Applications
z CDMA/GSM Cellular Handsets z Battery-Powered Equipment z Laptop, Palmtops, Notebook Computers
Ordering Information
RT9198T-
z Hand-Held Instruments z PCMCIA Cards
Package Type U5 : SC-70-5 U5R : SC-70-5 (R-Type) V : SOT-23-3 B : SOT- 23-5 BR : SOT- 23-5 (R-Type)
z Portable Information Appliances
Marking Information
For marking information, contact our sales representative directly or through a Richtek distributor located in your
Note :
Lead Plating System
area.
P : Pb Free
G : Green (Halogen Free and Pb Free) Pin Configurations
Output Voltage 15 : 1.5V 16 : 1.6V
: 34 : 3.4V 35 : 3.5V 1H : 1.85V
(TOP VIEW)
VIN
3
2
2H : 2.85V
GND VOUT
Richtek products are : ` RoHS compliant and compatible with the current require-
SOT-23-3
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
DS9198T-04 April 2011
www.richtek.com 1
Downloaded from Elcodis.com electronic components distributor
RT9198T
VIN VOUT
54 23
EN NC GND SOT-23-5/SC-70-5
Typical Application Circuit
VIN CIN 1uF
Chip Enable
VOUT
5
NC
4
23
VIN GND EN SOT-23-5/SC-70-5 (R-Type)
RT9198T VIN VOUT
EN GND
COUT VOUT 1uF
Functional Pin Description
Pin Name
EN
NC GND VOUT VIN
Pin Function Chip Enable (Active High). Note that this pin is high impedance..