Preliminary
RT9017
500mA Peak, Thermal Folded Back CMOS LDO Regulator
General Description
The RT9017 is designed for portable RF and wireless
applications with demanding performance and space
requirements. The RT9017 performance is optimized for
battery-powered systems to deliver ultra low noise and
low quiescent current. Regulator ground current increases
only slightly in dropout, further prolonging the battery life.
The RT9017 also works with low-ESR ceramic capacitors,
reducing the amount of board space necessary for power
applications, critical in hand-held wireless devices. The
RT9017 consumes less than 0.01μA in shutdown mode
and has fast turn-on time less than 50μs. RT9017 is short
circuit thermal folded back protected. RT9017 lowers its
OTP trip point from 165°C to 110°C when output short
circuit occurs (V
OUT
< 0.4V) providing maximum safety to
end users. The other features include ultra low dropout
voltage, high output accuracy, current limiting protection,
and high ripple rejection ratio. Available in the SOT-23-3,
SOT-23-5 and WDFN-6L 2x2 packages, the RT9017 also
offers a range of 1.5V to
3.5V
with 0.1V per step.
Features
Short Circuit Thermal Folded Back Protection
Low-Noise for RF Application
Fast Response in Line/Load Transient
Quick Start-Up (Typically 50μs)
μ
0.01μA Standby Current When Shutdown
μ
Low Dropout : 380mV @ 500mA
Wide Operating Voltage Ranges : 2.5V to 5.5V
TTL-Logic-Controlled Shutdown Input
Low Temperature Coefficient
Current Limiting Protection
Thermal Shutdown Protection
Only 1μF Output Capacitor Required for Stability
μ
High Power Supply Rejection Ratio
Custom Voltage Available
RoHS Compliant and 100% Lead (Pb)-Free
Applications
CDMA/GSM Cellular Handsets
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
PCMCIA Cards
Portable Information Appliances
Ordering Information
RT9017-
Package Type
V : SOT-23-3
B : SOT- 23-5
BR : SOT- 23-5 (R-Type)
QW : WDFN-6L 2x2 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
15 : 1.5V
16 : 1.6V
:
34 : 3.4V
35 : 3.5V
1H : 1.85V
2H : 2.85V
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area, otherwise visit our website for detail.
Pin Configurations
(TOP VIEW)
VIN
3
EN
GND
VIN
1
2
3
7
6
5
4
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.
DS9017-03 August 2007
NC
NC
VOUT
1
GND
2
VOUT
WDFN-6L 2x2
SOT-23-3
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1
RT9017
EN
NC
GND
1
2
3
4
5
VIN
Preliminary
VIN
GND
1
2
3
5
VOUT
VOUT
EN
4
NC
SOT-23-5
SOT-23-5 (R-Type)
Typical Application Circuit
RT9017
V
IN
C
IN
1uF
VIN
VOUT
C
OUT
1uF
EN
GND
V
OUT
Chip Enable
Functional Pin Description
Pin Name
EN
NC
GND
VOUT
VIN
Pin Function
Chip Enable (Active High). Note that this pin is high impedance. There should be a pull low 100kΩ
resistor connected to GND when the control signal is floating.
No Internal Connection.
Ground.
Output Voltage.
Input Voltage.
Function Block Diagram
EN
Shutdown
and
Logic Control
V
REF
-
+
Error
Amplifier
VIN
MOS Driver
VOUT
Current-Limit
and
Thermal
Protection
GND
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2
DS9017-03 August 2007
Preliminary
Absolute Maximum Ratings
(Note 1)
RT9017
6V
400mW
400mW
606mW
250°C/W
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-3 --------------------------------------------------------------------------------------------------------------------
SOT-23-5 --------------------------------------------------------------------------------------------------------------------
WDFN-6L 2x2 --------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 4)
SOT-23-3,
θ
JA
---------------------------------------------------------------------------------------------------------------
SOT-23-5,
θ
JA
--------------------------------------------------------------------------------------------------------------- 250°C/W
WDFN-6L 2x2,
θ
JA
--------------------------------------------------------------------------------------------------------- 165°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature
(Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range --------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= V
OUT
+ 1V, C
IN
= C
OUT
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Output Voltage Accuracy
Current Limit
Quiescent Current
Dropout Voltage (Note 5)
Line Regulation
Load Regulation
Standby Current
EN Input Bias Current
EN Threshold
Power Supply
Rejection Rate
Logic-Low Voltage
Symbol
ΔV
OUT
I
LIM
I
Q
V
DROP
ΔV
LINE
Test Conditions
I
OUT
= 1mA
R
LOAD
= 1Ω
V
EN
>= 1.2V, I
OUT
= 0mA
I
OUT
= 300mA, V
OUT
> 2.8V
I
OUT
= 500mA, V
OUT
> 2.8V
V
IN
= (V
OUT
+ 1V) to 5.5V,
I
OUT
= 1mA
Min
−2
530
--
--
--
--
--
--
--
--
1.2
--
--
--
--
--
Typ
--
--
90
220
380
--
--
0.01
0
--
--
−60
−30
165
30
110
Max
+2
--
130
--
--
0.3
0.6
1
100
0.4
--
--
--
--
--
--
Units
%
mA
μA
mV
%
%
μA
nA
V
ΔV
LOAD
1mA < I
OUT
< 500mA
I
STBY
I
IBSD
V
IL
V
EN
= GND, Shutdown
V
EN
= GND or V
IN
V
IN
= 3V to 5.5V, Shutdown
V
IN
= 3V to 5.5V, Start-Up
C
OUT
= 1μF, I
OUT
= 100mA
Logic-High Voltage V
IH
f = 100Hz
f = 10kHz
PSRR
T
SD
ΔT
SD
dB
°C
°C
°C
Thermal Shutdown Temperature
Thermal Shutdown Temperature
Hysteresis
Thermal Folded Back
DS9017-03 August 2007
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3
RT9017
Preliminary
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 recommended.
Note 3.
The device is not guaranteed to function outside its operating conditions.
Note 4.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective single layer thermal conductivity test board
of JEDEC 51-3 thermal measurement standard.
Note 5.
The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
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4
DS9017-03 August 2007
Preliminary
Typical Operating Characteristics
Output Voltage vs. Temperature
2
RT9017
Quiesent Current vs. Temperature
100
95
V
IN
= 5V
C
IN
= C
OUT
= 1uF
RT9017-15PB
V
IN
= 3.3V
C
IN
= C
OUT
= 1uF
Quiescent Current (uA)
Output Voltage (V)
1.9
90
85
80
75
70
65
1.8
No Load
1.7
1.6
-50
-25
0
25
50
75
100
125
60
-50
-25
0
25
50
75
100
125
Temperature
(°C)
Temperature
(°C)
EN Pin Shutdown Threshold vs. Temperature
1.5
Dropout Voltage vs. Load Current
600
500
EN Pin Threshold Voltage (V)
Dropout Voltage (mV)
1.25
RT9017-15PB
V
IN
= 3.3V
C
IN
= C
OUT
= 1uF
RT9017-33PB
C
IN
= C
OUT
= 1uF
T
J
= 125°C
400
300
200
100
0
1
T
J
= 25°C
0.75
T
J
= -40°C
0.5
0.25
-50
-25
0
25
50
75
100
125
0
100
200
300
400
500
Temperature
(°C)
Load Current (mA)
20
PSRR
Input Voltage
Deviation (V)
V
OUT
= 2.5V
C
IN
= C
OUT
= 1uF,
X7R
5
4
3
Line Transient Response
C
IN
= C
OUT
= 1uF
I
LOAD
= 50mA
0
PSRR (dB)
-20
-40
Output Voltage
Deviation (mV)
1K
1
10K
10
100K
100
1M
1000
20
0
-20
I
LOAD
= 100mA
-60
I
LOAD
= 10mA
-80
10
0.01
100
0.1
Time (100μs/Div)
Frequency (kHz)
(Hz)
DS9017-03 August 2007
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