Preliminary
RT9016
500mA Peak, Thermal Folded Back CMOS LDO Regulator
General Description
The RT9016 is designed for portable RF and wireless
applications with demanding performance and space
requirements. The RT9016 performance is optimized for
battery-powered systems to deliver ultra low noise and
low quiescent current. A noise bypass pin is available for
further reduction of output noise. Regulator ground current
increases only slightly in dropout, further prolonging the
battery life. The RT9016 also works with low-ESR ceramic
capacitors, reducing the amount of board space necessary
for power applications, critical in hand-he
ld wireless
devices. The RT9016 consumes less than 0.01μA in
shutdown mode and has fast turn-on time less than 50μs.
RT9016 is short circuit thermal folded back protected.
RT9016 lowers its OTP trip point from 165°C to 110°C
when output short circuit occurs (V
< 0.4V) providing
OUT
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-23-5 and WDFN-6L 2x2 packages.
Ordering Information
RT9016-
Package Type
B : SOT-23-5
QW : WDFN-6L 2x2 (W-Type)
Operating Temperature Range
P : Pb Free with Commercial Standard
Output Voltage
15 : 1.5V
16 : 1.6V
:
34 : 3.4V
35 : 3.5V
1H : 1.85V
2H : 2.85V
Note :
RichTek Pb-free 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.
Features
zz
Short Circuit Thermal Folded Back Protection
z
zz
zz
z Ultra-Low-Noise for RF Application
zz
zz
z Ultra-Fast Response in Line/Load Transient
zz
zz
z Quick Start-Up (T ypically 50
zz
μμ
zz
z 0.01
μA Standby Current When Shutdown
zz
μμ
zz
z Low Dropout : 380mV @ 500mA
zz
zz
z Wide Operating Voltage Ranges : 2.5V to 5.5V
zz
zz
z TTL-Logic-Controlled Shutdown Input
zz
zz
z Low Temperature Coefficient
zz
zz
z Current Limiting Protection
zz
zz
z Thermal Shutdown Protection
zz
zz
z Only 1
zz
zz
z High Power Supply Rejection Ratio
zz
zz
z Custom Voltage Available
zz
zz
z RoHS Compliant and 100% Lead (Pb)-Free
zz
μμ
μF Output Capacitor Required for Stability
μμ
μμ
μs)
μμ
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
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
GND
EN
1
2
354
SOT-23-5 WDFN-6L 2x2
VOUT
BP
EN
GND
1
2
3
6
BP
5
NC
4
VOUTVIN
DS9016-00 February 2006 www.richtek.com
1
RT9016
Typical Application Circuit
V
IN
C
IN
1uF
Preliminary
RT9016
VIN
GND
VOUT
C
OUT
1uF
V
OUT
Chip Enable
Functional Pin Description
Pin Name
VIN
GND
EN
BP
VOUT
Pin Function
Input Voltage.
Ground.
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.
Reference Noise Bypass.
Output Voltage.
Function Block Diagram
EN
Quick
Start
Shutdown
and
Logic Control
EN BP
C
BP
22nF
VIN
BP
V
REF
-
+
Error
Amplifier
MOS Driver
VOUT
Current-Limit
and
Thermal
Protection
GND
DS9016-00 February 2006www.richtek.com
2
Preliminary
RT9016
Absolute Maximum Ratings (Note 1)
z Supply Input Voltage ------------------------------------------------------------------------------------------------------ 6V
z Power Dissipation, P
@ T
D
= 25°C
A
SOT-23-5 -------------------------------------------------------------------------------------------------------------------- 400mW
WDFN-6L 2x2 -------------------------------------------------------------------------------------------------------------- 606mW
z Package Thermal Resistance (Note 4)
SOT-23-5, θJA--------------------------------------------------------------------------------------------------------------- 250°C/W
WDFN-6L 2x2, θJA--------------------------------------------------------------------------------------------------------- 165°C/W
z Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C
z Junction Temperature ---------------------------------------------------------------------------------------------------- 150°C
z Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
z ESD Susceptibility (Note 2)
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Mode) ------------------------------------------------------------------------------------------------------ 200V
Recommended Operating Conditions (Note 3)
z Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.5V to 5.5V
z Junction Temperature Range--------------------------------------------------------------------------------------------
z Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C to 125°C
−40°C to 85°C
Electrical Characteristics
(VIN = V
+ 1V, CIN = C
OUT
= 1μF, CBP = 22nF, T
OUT
Parameter Symbol Test Conditions Min Typ Max Units
Output Voltage Accuracy ΔV
Current Limit I
Quiescent Current IQ VEN ≥ 1.2V, I
Dropout Voltage (Note 5) V
Line Regulation ΔV
Load Regulation ΔV
Standby Current I
EN Input Bias Current I
Logic-Low Voltage
EN Threshold
Logic-High Voltage
Output Noise Voltage eNO
Power Supply
Rejection Rate
f = 100Hz -- −70 --
f = 10kHz
= 25°C, unless otherwise specified)
A
I
OUT
R
LIM
DROP
LINE
LOAD
VEN = GND, Shutdown -- 0.01 1 μA
STBY
VEN = GND or VIN -- 0 100 nA
IBSD
V
VIN = 3V to 5.5V, Shutdown -- -- 0.4
IL
VIN = 3V to 5.5V, Start-Up 1.2 -- --
V
IH
= 1mA −2 -- +2 %
OUT
= 1Ω 530 -- -- mA
LOAD
I
= 300mA, V
OUT
I
= 500mA, V
OUT
V
= (V
IN
I
OUT
1mA < I
OUT
= 1mA
OUT
10Hz to 100kHz, I
= 1μF
C
OUT
PSRR C
OUT
= 1μF, I
= 0mA -- 90 130 μA
OUT
> 2.8V -- 220 --
OUT
> 2.8V -- 380 --
OUT
+ 0.3V) to 5.5V,
-- -- 0.3 %
mV
< 500mA -- -- 0.6 %
V
= 200mA
OUT
OUT
= 10mA
-- 100 -- μV
-- −50 --
RMS
dB
To be continued
DS9016-00 February 2006 www.richtek.com
3
RT9016
y
Preliminary
Parameter Symbol Test Conditions Min Typ Max Units
Thermal Shutdown Temperature TSD -- 165 -- °C
Thermal Shutdown Temperature
H
steresis
-- 30 -- °C
ΔT
SD
Thermal Folded Back -- 110 -- °C
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
Note 5. The dropout voltage is defined as V
is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board
JA
(Single Layer, 1S) of JEDEC 51-3 thermal measurement standard.
-V
IN
, which is measured when V
OUT
OUT
is V
OUT(NORMAL)
− 100mV.
DS9016-00 February 2006www.richtek.com
4
Typical Operating Characteristics
Preliminary
RT9016
Output Voltage vs. Temperature
1.8
RT9016-15PB
V
= 3.3V
IN
1.7
1.6
1.5
1.4
CIN = C
= 1uF X7R
OUT
Output Voltage (V)
1.3
1.2
-50 -25 0 25 50 75 100 125
Temperature
(°C)
Dropout Voltage vs. Load Current
600
RT9016-33PB
CIN = C
500
400
300
200
Dropout Voltage (mV)
100
OUT
= 1uF
T
J
= 25°C
T
J
= 125°C
T
= -40°C
J
Quiescent Current vs. Temperature
95
RT9016-15PB
V
= 3.3V
IN
90
CIN = C
85
80
75
70
Quiescent Current (uA)
65
60
-50-250 255075100125
= 1uF X7R
OUT
Temperature
(°C)
PSRR
20
V
= 4V to 5V
IN
PSRR (dB)
CIN = C
0
-20
-40
-60
= 1uF, X7R
OUT
I
LOAD
= 100mA
I
LOAD
= 10mA
0
0 100 200 300 400 500
Load Current (mA)
EN Pin Shoutdown Threshold vs. Temperature
1.75
RT9016-15PB
V
= 3.3V
IN
CIN = C
1.5
1.25
1
0.75
EN Pin Shoutdown Threshold (V)
0.5
-50 -25 0 25 50 75 100 125
= 1uF X7R
OUT
Temperature
(°C)
-80
10 100 1K 10K 100K 1M
0.01 0.1 1 10 100 1000
Frequency (kHz)
(Hz)
EN Pin Shutdown Response
V
10
5
(V)
0
EN Pin Voltage
(V)
Output Voltage
2
1
0
= 5V
IN
CIN = C
OUT
= 1uF
Time (500μs/Div)
RT9016-28PB
No Load
DS9016-00 February 2006 www.richtek.com
5
RT9016
Preliminary
RT9016-35PB
V
400
200
(mA)
0
Load Current
50
0
-50
Output Voltage
Deviation (mV)
V
IN
C
OUT
6
5
4
Deviation (V)
Input Voltage
Load Transient Response
IN
= 5.0V
Time (500μs/Div)
CIN = C
I
LOAD
Line Transient Response
= 4V to 5V
= 1uF
= 1uF
OUT
= 10mA to 300mA
RT9016-25PB
I
= 1mA
LOAD
400
200
(mA)
0
Load Current
50
0
-50
Output Voltage
Deviation (mV)
V
C
6
5
Deviation (V)
Input Voltage
4
Load Transient Response
RT9016-35PB
V
= 5.0V
IN
Time (500μs/Div)
CIN = C
I
LOAD
Line Transient Response
= 4V to 5V
IN
= 1uF
OUT
= 1uF
OUT
= 10mA to 400mA
RT9016-25PB
I
= 100mA
LOAD
10
0
-10
Output Voltage
Deviation (mV)
V
IN
CIN = C
200
100
0
-100
Noise (μV)
-200
= 4.5V
OUT
Time (50μs/Div)
= 1uF, X7R
Time (10ms/Div)
Noise
RT9016-30PB
I
= 50mA
LOAD
f = 10Hz to 100kHz
10
0
-10
Output Voltage
Deviation (mV)
V
CIN = C
200
100
0
-100
Noise (μV)
-200
IN
= 4.5V
OUT
Time (100μs/Div)
Noise
= 1uF, X7R
Time (10ms/Div)
RT9016-15PB
I
= 50mA
LOAD
f = 10Hz to 100kHz
DS9016-00 February 2006www.richtek.com
6
10
5
(V)
0
EN Pin Voltage
2
1
(V)
0
Output Voltage
V
= 5V
IN
CIN = C
OUT
Start Up
= 1uF
Time (10μs/Div)
Preliminary
RT9016-28PB
No Load
RT9016
DS9016-00 February 2006 www.richtek.com
7
RT9016
Applications Information
Preliminary
Like any low-dropout regulator, the external capacitors used
with the RT9016 must be carefully selected for regulator
stability and performance. Using a capacitor whose value
is > 1μF on the RT9016 input and the amount of
capacitance can be increased without limit. The input
capacitor must be located a distance of not more than
0.5 inch from the input pin of the IC and returned to a
clean analog ground. Any good quality ceramic or
tantalum can be used for this capacitor. The capacitor
with larger value and lower ESR (equivalent series
resistance) provides better PSRR and line-transient
response. The output capacitor must meet both
requirements for minimum amount of capacitance and
ESR in all LDOs application. The RT9016 is designed
specifically to work with low ESR ceramic output capacitor
in space-saving and performance consideration. Using
a ceramic capacitor whose value is at least 1μF with ESR
is > 25mΩ on the RT9016 output ensures stability. The
RT9016 still works well with output capacitor of other types
due to the wide stable ESR range. Figure 1 shows the
curves of allowable ESR range as a function of load current
for various output capacitor values. Output capacitor of
larger capacitance can reduce noise and improve load
transient response, stability, and PSRR. The output
capacitor should be located not more than 0.5 inch from
the V
pin of the RT9016 and returned to a clean analog
OUT
ground.
Bypass Capacitor and Low Noise
Connecting a 22nF between the BP pin and GND pin
significantly reduces noise on the regulator output, it is
critical that the capacitor connection between the BP pin
and GND pin be direct and PCB traces should be as short
as possible. There is a relationship between the bypass
capacitor value and the LDO regulator turn on time. DC
leakage on this pin can affect the LDO regulator output
noise and voltage regulation performance.
Enable Function
The RT9016 features an LDO regulator enable/disable
function. To assure the LDO regulator will switch on, the
EN turn on control level must be greater than 1.2 volts.
The LDO regulator will go into the shutdown mode when
the voltage on the EN pin falls below 0.4 volts. For to
protecting the system, the RT9016 have a quick-discharge
function. If the enable function is not needed in a specific
application, it may be tied to VIN to keep the LDO regulator
in a continuously on state.
Thermal Considerations
Thermal protection limits power dissipation in RT9016.
When the operation junction temperature exceeds 165°C,
the OTP circuit starts the thermal shutdown function turn
the pass element off. The pass element turn on again
after the junction temperature cools by 30°C.
Region of Stable C
100.00
100
10
10.00
ESR (Ω)
OUT
1.00
1
ESR (Ω)
0.10
OUT
C
0.01
Region of Stable C
0.00
0 100 200 300 400 500
8
ESR vs. Load Current
OUT
RT9016-15PB
C
= 1μF, X7R
Unstable Region
Stable Region
Unstable Region (Simulation Verity)
Load Current (mA)
IN
C
OUT
Figure 1
= 1uF
RT9016 lowers its OTP trip level from 165°C to 110°C
when output short circuit occurs (V
< 0.4V) as shown
OUT
in Figure 2. This limits IC case temperature under 100°C
and provides maximum safety to end users when output
short circuit occurs.
For continue operation, do not exceed absolute maximum
operation junction temperature 125°C. The power
dissipation definition in device is :
PD = (VIN−V
OUT
) x I
OUT
+ VIN x I
Q
The maximum power dissipation depends on the thermal
resistance of IC package, PCB layout, the rate of
surroundings airflow and temperature difference between
junction to ambient. The maximum power dissipation can
be calculated by following formula :
DS9016-00 February 2006www.richtek.com
Preliminary
RT9016
P
Where T
D(MAX)
= ( T
J(MAX)
− TA ) /θ
J(MAX)
JA
is the maximum operation junction
temperature 125°C, TA is the ambient temperature and
the θ
is the junction to ambient thermal resistance.
JA
For recommended operating conditions specification of
RT9016, where T
is the maximum junction
J(MAX)
temperature of the die (125°C) and TA is the maximum
ambient temperature. The junction to ambient thermal
resistance (θJA is layout dependent) for SOT-23-5 package
is 250°C/W and WDFN-6L 2x2 package is 165°C/W on
standard JEDEC 51-3 thermal test board. The maximum
power dissipation at TA = 25°C can be calculated by
following formula :
P
P
= (125°C−25°C) / 250 = 400mW (SOT-23-5)
D(MAX)
= (125°C−25°C) / 165 = 606mW V(DFN-6L 2x2)
D(MAX)
The maximum power dissipation depends on operating
ambient temperature for fixed T
and thermal
J(MAX)
resistance θJA. For RT9016 packages, the Figure 3 of
derating curves allows the designer to see the effect of
rising ambient temperature on the maximum power
allowed.
700
WDFN-6L 2x2
600
500
SOT-23-5
400
300
200
Power Dissipation (mW)
100
0
0 25 50 75 100 125 150
Ambient Temperature (°C)
(°C)
Figure 3. Derating Curve for Packages
V
Short to GND
OUT
0.4V
V
OUT
I
OUT
TSD
°
165 C
110 C
OTP Trip Point
IC Temperature
°
110 C
80 C
°
°
Figure 2. Short Circuit Thermal Folded Back Protection
when Output Short Circuit Occurs
DS9016-00 February 2006 www.richtek.com
9
RT9016
Outline Dimension
Preliminary
H
D
L
C
b
A
e
Dimensions In Millimeters Dimensions In Inches
Symbol
Min Max Min Max
A 0.889 1.295 0.035 0.051
A1 0.000 0.152 0.000 0.006
B 1.397 1.803 0.055 0.071
b 0.356 0.559 0.014 0.022
C 2.591 2.997 0.102 0.118
D 2.692 3.099 0.106 0.122
B
A1
10
e 0.838 1.041 0.033 0.041
H 0.080 0.254 0.003 0.010
L 0.300 0.610 0.012 0.024
SOT-23-5 Surface Mount Package
DS9016-00 February 2006www.richtek.com
Preliminary
RT9016
D
E
A
A3
A1
D2
L
E2
SEE DETAIL A
1
e
b
2
1
1
2
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.
Dimensions In Millimeters Dimensions In Inches
Symbol
Min Max Min Max
A 0.700 0.800 0.028 0.031
A1 0.000 0.050 0.000 0.002
A3 0.175 0.250
b 0.200 0.350 0.008 0.014
D 1.950 2.050 0.077 0.081
D2 1.000 1.450 0.039 0.057
E 1.950 2.050 0.077 0.081
E2 0.500 0.850 0.020 0.033
e 0.650 0.026
L 0.300 0.400
RICHTEK TECHNOLOGY CORP .
Headquarter
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
0.007 0.010
0.012 0.016
W-Type 6L DFN 2x2 Package
RICHTEK TECHNOLOGY CORP .
Taipei Office (Marketing)
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
DS9016-00 February 2006 www.richtek.com
11
Loading...