LRC LR9198-50

LESHAN RADIO COMPANY, LTD.
300mA Ultra-low Noise, Ultra-Fast
CMOS LDO Regulator
FEATURES
LR9198
Hand-Held Instruments
PCMCIA Cards
MP3/MP4/MP5 Players
Portable Information Appliances
Ultra-low Noise for RF Application
Ultra-Fast Response in Line/Load
Transient
<0.01µA
Standby
Current
When
Shutdown.
Low Dropout:[email protected]
Wide Operating Voltage Ranges:2V to
6V
TTL-logic-Controlled Shutdown Input
Low Temperature Coefficient
Current Limiting Protection
Thermal Shutdown Protection
Only 1µF Output Capacitor Required for
Stability
High Power Supply Rejection Ratio
Custom Voltage Available
Fast output discharge
Available in 5-Lead SOT-23 and SC-70
Package
APPLICATIONS
Cellular and Smart Phones
Battery-Powered Equipment
Laptop, Palmtops, Notebook Computers
DESCRIPTION
The LR9198 is designed for portable RF and
wireless applications with demanding performance and space requirements. The LR9198
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 LR9198 also
works with low-ESR ceramic capacitors,
reducing the amount of board space
necessary for power applications, critical in
hand-held wireless devices. The LR9198
consumes less than 0.01µA in shutdown
mode and has fast turn-on time less than
50µs. The other features include ultra low
dropout voltage, high output accuracy,
current limiting protection, and high ripple
rejection ratio. Available in the 5-lead SC-70
and SOT-23 packages.
ORDERING INFORMATION
TYPICAL APPLICATION
LR9198 XX X X X XXX
LR9198 28 AA
Package:
RN: SOT-23-5
URN: SC-70-5
VIN
1
CIN
Features
P: Standard (default, lead free)
C: Customized
Enable Option:
A: active high with internal 8 MΩ pull down
B: active low with internal 8 MΩ pull up
Output Voltage Accuracy
A: ±1%
B: ±2%
Output Voltage:
12: 1.2V 15: 1.5V 18:1.8V 25:2.5V
28: 2.8V 30: 3.0V 33:3.3V 50:5.0V
CT: custom fixed output (50mV step)
VIN
2
Chip Enable
3
VOUT
5
VOUT
COUT
LR9198
GND
EN
NC
4
Application hints:
Output capacitor (COUT≥2.2uF) is
recommended in LR9198-1.2V application to
assure the stability of circuit.
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LESHAN RADIO COMPANY, LTD.
Absolute Maximum Rating
Input Supply Voltage (VIN)
EN Input Voltage
Output Voltage
Output Current
(Note 1)
-0.3V to +6V
-0.3V to +VIN
-0.3V to VIN+0.3V
300mA
Maximum Junction Temperature
125°C
(Note2)
Operating Temperature Range
-40°C to 85°C
Storage Temperature Range
-65°C to 125°C
Lead Temperature (Soldering, 10s)
300°C
Package Information
SOT23
SOT2323-5/SC70
SC7070-5
TOP VIEW
VIN
1
Part Number
VOUT
4
NC
MARKING
GND 2
EN
5
3
Top Mark
Temp Range
(Note3)
LR9198-12
-40°C to +85°C
EAYW
LR9198-15
EBYW
-40°C to +85°C
LR9198-18
ECYW
-40°C to +85°C
LR9198-25
EDYW
-40°C to +85°C
LR9198-28
EEYW
-40°C to +85°C
LR9198-30
EFYW
-40°C to +85°C
LR9198-33
EGYW
-40°C to +85°C
LR9198-50
EIYW
-40°C to +85°C
Thermal Resistance (Note 4)
Package
SOT23-5
SC70-5
ӨJA
250°C/W
333°C/W
ӨJC
130°C/W
170°C/W
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: The LR9198 is guaranteed to meet performance specifications from 0°C to 70°C. Specifications over the –40°C
to 85°C operating temperature range are assured by design, characterization and correlation with statistical
process controls.
Note 3: X: Product Code(LR9198:E) V: Voltage Code(1.2V:A, 1.5V:B, 1.8V:C, 2.5V:D, 2.8V:E, 3.0V:F, 3.3V:G, 5.0V:I) Y:
Year of manufacturing(9:2009) W: Week of manufacturing(W:A-Z, a-z).
Note 4: Thermal Resistance is specified with approximately 1 square of 1 oz copper.
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Pin Description
PIN
1
2
NAME
VIN
GND
3
EN
4
5
NC
VOUT
FUNCTION
Power Input Voltage.
Ground.
Chip Enable Pin with two options.
A: active high with internal 8 MΩ pull down
B: active low with internal 8 MΩ pull up
No Connection.
Output Voltage.
Block Diagram
LR9198 XX XA
LR9198 XX XB
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Electrical Characteristics (Note 5)
(VIN=3.6V, EN=VIN, CIN=COUT=1µF, TA=25℃, unless otherwise noted.)
Parameter
Symbol
Conditions
MIN
Input Voltage
VIN
2
Output Voltage Accuracy
-1
VIN=3.6V,
∆VOUT
(Note 6)
IOUT=1mA
-2
Current Limit
ILIM
400
RLOAD=1Ω
Quiescent Current
IQ
VEN>1.2V, IOUT=0mA
IOUT=200mA,
VOUT=2.8V
Dropout Voltage
VDROP
IOUT=300mA,
VOUT=2.8V
V
=3.6V
to 5.5V
(Note 7)
IN
∆VLINE
Line Regulation
IOUT=1mA
(Note 8)
∆VLOAD
1mA<IOUT<300mA
Load Regulation
(Note 9)
Output Voltage
TCVOUT
IOUT=1mA
Temperature Coefficient
VEN=GND,
Standby Current
ISTBY
Shutdown
EN Input Bias Current
IIBSD
VEN=GND or VIN
VIN=3V to 5.5V,
EN
Logic Low
VIL
Shutdown
Input
VIN=3V to 5.5V,
Threshold
Logic High
VIH
1.2
Start up
Output Noise
10Hz to100KHz,
eNO
Voltage
IOUT=200mA
Power
f=217Hz
Supply
PSRR
IOUT=100mA
f=1KHz
Rejection
f=10KHz
Ratio
Thermal Shutdown
Shutdown, Temp
TSD
increasing
Temperature
Thermal Shutdown
TSDHY
Hysteresis
TYP
MAX
6
+1
+2
unit
V
%
430
90
130
mA
µA
130
180
210
300
0.05
0.17
%/V
2
%/A
mV
±60
0.01
ppm/℃
1
µA
500
nA
0.4
V
V
100
µVRMS
-78
-72
dB
-52
165
℃
30
℃
Note 5: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and
characterization.
Note 6: This IC includes two kinds of output voltage accuracy versions. A: ±1%, B: ±2%.
 VOUT 1 − VOUT 2
 ∆VIN × VOUT ( normal )
Note 7: Line regulation is calculated by ∆V
LINE = 


× 100

Where VOUT1 is the output voltage when VIN=5.5V, and VOUT2 is the output voltage when VIN=3.6V,
△VIN=1.9V . VOUT (normal) =2.8V.
 VOUT 1 − VOUT 2 
Note 8: Load regulation is calculated by ∆V
× 100
LOAD = 
 ∆I × V

 OUT OUT ( normal ) 
Where VOUT1 is the output voltage when IOUT=1mA, and VOUT2 is the output voltage when IOUT=300mA. △IOUT=0.299A,
VOUT(normal)=2.8V.
∆VOUT
Note 9: The temperature coefficient is calculated by TC
VOUT =
∆T × VOUT
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Typical Performance Characteristics
Output Voltage Vs. Temperature
Quiescent Current Vs. Temperature
140
3.0
VIN=3.6V
Output Voltage(V)
Quiescent Current(uA)
CIN=COUT=1uF
2.9
VIN=3.6V
CIN=COUT=1uF
130
2.8
2.7
120
110
100
90
80
2.6
70
2.5
-50
-25
0
25
50
75
100
60
-50
125
-25
0
25
50
Dropout Voltage Vs. Load Current
VIN=4.2V
CIN=1uF,COUT=1uF,X7R
-10
ILOAD=1mA
ILOAD=100mA
ILOAD=200mA
-20
-30
PSRR(dB)
200
150
100
-40
-50
-60
TJ=85°C
TJ=25°C
TJ=-40°C
50
0
50
100
150
200
250
-70
-80
300
-90
10
100
Load Current(mA)
1000
10000
100000
Frequency(Hz)
EN Pin Shutdown Threshold Vs. Temperature
Current Limit Vs. Input Voltage
500
1.05
VIN=3.6V
1.00
480
CIN=COUT=1uF
CIN=COUT=1uF
VOUT=2.8V
460
Current Limit(mA)
Dropout Voltage(mV)
125
PSRR
CIN=COUT=1uF
250
EN Pin Shutdown Threshold(V)
100
0
300
0
75
Temperature(°C)
Temperaute(°C)
0.95
0.90
0.85
440
420
400
380
360
0.80
340
320
0.75
-50
-25
0
25
50
Temperature(°C)
75
100
125
300
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage(V)
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LESHAN RADIO COMPANY, LTD.
Output Voltage(V)
VOUT Vs.VIN
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
1.0
CIN=COUT=1uF
ILoad=1mA
ILoad=100mA
ILoad=300mA
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage(V)
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LESHAN RADIO COMPANY, LTD.
Applications Information
Like any low-dropout regulator, the external capacitors used with the LR9198
must be carefully selected for regulator
stability and performance. Using a capacitor whose value is > 1µF on the LR9198
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 LR9198 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 LR9198 output ensures
stability. The LR9198 still works well with
output capacitor of other types due to the
wide stable ESR range. 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
VOUT pin of the BL9198 and returned to a
clean analog ground.
Enable Function
The LR9198 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 shut-
down mode when the voltage on the EN
pin falls below 0.4 volts. For to protect the
system, the LR9198 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 LR9198. When the operation junction
temperature exceeds 165°C, the OTP
circuit starts the thermal shutdown function
turn the pass element off. The pass
element turns on again after the junction
temperature cools by 30°C.
For continue operation, do not exceed
absolute maximum operation junction
temperature 125°C. The power dissipation
definition in device is:
PD = (VIN−VOUT) ×IOUT + VIN×IQ
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:
PD(MAX) = ( TJ(MAX) − TA ) /θJA
Where TJ(MAX) is the maximum operation
junction temperature 125°C, TA is the
ambient temperature and the θJA is the
junction to ambient thermal resistance. For
recommended operating conditions specification of LR9198, where TJ(MAX) is the
maximum junction temperature of the die
(125°C) and TA is the maximum ambient
temperature. The junction to ambient thermal resistance (θJA is layout dependent)
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LESHAN RADIO COMPANY, LTD.
for SOT-23-5 package is 250°C/W, SC-705 package is 333°C/W, on standard
JEDEC 51-3 thermal test board. The maximum power dissipation at TA= 25°C can
be calculated by following formula:
with separate ground planes for VIN and
VOUT, with each ground plane connected
only at the GND pin of the device.
PD(MAX) = (125°C−25°C)/333 = 300mW
(SC-70-5)
PD(MAX) = (125°C−25°C)/250 = 400mW
(SOT-23-5)
The maximum power dissipation depends
on operating ambient temperature for fixed
TJ(MAX) and thermal resistance θJA. It is
also useful to calculate the junction of
temperature of the BL9198 under a set of
specific conditions. In this example let the
Input voltage VIN=3.3V, the output current
Io=300mA and the case temperature
TA=40°C measured by a thermal couple
during operation. The power dissipation for
the VOUT=2.8V version of the BL9198 can
be calculated as:
PD = (3.3V−2.8V) ×300mA+3.6V×100uA
=150mW
And the junction temperature, TJ, can be
calculated as follows:
TJ=TA+PD×θJA=40°C+0.15W×250°C/W
=40°C+37.5°C=77.5°C<TJ(MAX) =125°C
For this operating condition, TJ is lower
than the absolute maximum operating
junction temperature,125°C, so it is safe to
use the LR9198 in this configuration.
Layout considerations
To improve ac performance such as PSRR,
output noise, and transient response, it is
recommended that the PCB be designed
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LESHAN RADIO COMPANY, LTD.
LR9198-2.8V Layout Circuit
VIN
VIN
1
C4
VIN
2
1
2
3
3
1
5
LR9198
C1
JP
VOUT
VIN
VOUT
C3
GND
EN
NC
4
2
3
TOP Layer Layout
BOTTOM Layer Layout
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LESHAN RADIO COMPANY, LTD.
Package Description
SC-70-5 Surface Mount Package
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Min
0.800
0.000
1.150
0.150
1.800
1.800
Max
1.100
0.100
1.350
0.400
2.450
2.250
Dimensions In Inches
Min
0.031
0.000
0.045
0.006
0.071
0.071
0.650
Max
0.044
0.004
0.054
0.016
0.096
0.089
0.026
0.080
0.260
0.003
0.010
0.210
0.460
0.008
0.018
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LESHAN RADIO COMPANY, LTD.
SOT-23-5 Surface Mount Package
Symbol
A
A1
B
b
C
D
e
H
L
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
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