RT916816PSH [RICHTEK]
200mA/500mA Fixed Output Voltage LDO Regulator; 200毫安/ 500毫安固定输出电压LDO稳压器
| 型号： | RT916816PSH |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | 200mA/500mA Fixed Output Voltage LDO Regulator |
| 文件： | 总11页 (文件大小：155K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
RT9168/A
200mA/500mA Fixed Output Voltage LDO Regulator
General Description
Features
z Stable with Low-ESR Output Capacitor
z Low Dropout Voltage (220mV at 200mA)
z Low Operation Current −80μA Typical
z Shutdown Function
The RT9168/A is a 200mA/500mA low dropout and
micropower regulator suitable for portable applications.
The output voltages range from 1.5V to 5.0V in 100mV
increments and 2% accuracy. The RT9168/Ais designed
for use with very low ESR capacitors. The output remains
stable even with a 1μF ceramic output capacitor.
z Low Temperature Coefficient
z Current and Thermal Limiting
z Custom Voltage Available
The RT9168/Auses an internal PMOS as the pass device,
which does not cause extra GND current in heavy load
and dropout conditions. The shutdown mode of nearly
zero operation current makes the IC suitable for battery-
powered devices. Other features include current limiting
and over temperature protection. The SOT-23-5 and
SOP-8 packages are also available for larger power
dissipation and design flexibility.
z SOT-23-5 and SOP-8 Packages
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z Cellular Telephones
z Laptop, Notebook, and Palmtop Computers
z Battery-powered Equipment
z Hand-held Equipment
Ordering Information
RT9168/A
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.
Package Type
BR : SOT-23-5
S : SOP-8
SH : SOP-8, High Shutdown
Pin Configurations
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
(TOP VIEW)
Output Voltage
15 : 1.5V
16 : 1.6V
:
1
2
3
5
VOUT
GND
VIN
NC
:
EN
4
49 : 4.9V
50 : 5.0V
RT9168/A-
CBR
500mA Output Current
200mA Output Current
SOT-23-5
Note :
8
VOUT
GND
GND
NC
VIN
2
3
4
7
6
5
RichTek Pb-free and Green products are :
`RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
GND
GND
EN/EN
`Suitable for use in SnPb or Pb-free soldering processes.
`100%matte tin (Sn) plating.
RT9168/A-
RT9168/A-
CS
CSH
SOP-8
DS9168/A-15 March 2007
www.richtek.com
1
RT9168/A
Typical Application Circuit
RT9168/A
VIN
VOUT
V
OUT
V
IN
C
C
IN
OUT
GND
1uF
1uF
NC
EN/EN
Functional Pin Description
Pin Name
Pin Function
VIN
Input Voltage
GND
Ground
EN (EN)
NC
Chip Enable Active High (Low)
No Connection
Output Voltage
VOUT
Function Block Diagram
Shutdown
and
VIN
EN/EN
Logic Control
V
REF
+
MOS Driver
Error
Amplifier
VOUT
Current-Limit and
Thermal Protection
R1
R2
GND
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DS9168/A-15 March 2007
RT9168/A
Absolute Maximum Ratings
z Input Voltage------------------------------------------------------------------------------------------------------------ 8V
z PowerDissipation, PD @ TA = 25°C
SOT-23-5 ---------------------------------------------------------------------------------------------------------------- 0.4W
SOP-8 -------------------------------------------------------------------------------------------------------------------- 0.625W
z Package Thermal Resistance (Note1)
SOT-23-5, θJA ----------------------------------------------------------------------------------------------------------- 250°C/W
SOP-8, θJA -------------------------------------------------------------------------------------------------------------- 160°C/W
z Operating Junction Temperature Range -------------------------------------------------------------------------- −40°C to 125°C
z Storage Temperature Range ---------------------------------------------------------------------------------------- −65°C to 150°C
z Lead Temperature (Soldering, 10 sec.)--------------------------------------------------------------------------- 260°C
Electrical Characteristics
(VIN = 5.0V, CIN = 1μF, COUT = 1μF, TA = 25°C, unless otherwise specified)
Parameter
Input Voltage Range
Output Voltage Accuracy
Symbol
Test Conditions
Min Typ Max Units
2.9
2.7
-2
200
500
--
--
--
7
7
V
V
IN
I = 50mA
L
--
+2
--
%
ΔV
I = 1mA
L
OUT
RT9168
--
mA
mA
mA
mA
Maximum Output
Current
I
I
MAX
RT9168A
RT9168
--
--
300
700
80
90
90
1.1
55
--
Current Limit
R
= 1Ω
LOAD
LIM
G
RT9168A
RT9168/A
RT9168
--
--
No Load
--
150
150
150
5
GND Pin Current
μA
--
I
I
I
I
I
I
I
= 200mA
OUT
OUT
OUT
OUT
OUT
OUT
RT9168A
RT9168/A
RT9168/A
RT9168/A
RT9168A
--
= 500mA
--
mV
= 1mA
(2)
Dropout Voltage
(V (Nominal)≥3.0V
Version)
--
100 mV
= 50mA
= 200mA
= 500mA
V
DROP
OUT
--
220 300 mV
600 750 mV
--
Line Regulation
Load Regulation
-0.2
--
--
+0.2 %/V
ΔV
ΔV
V
= (V
+0.15) to 7V, I = 1mA
OUT
LINE
IN
OUT
RT9168/A
RT9168A
0.01 0.04
0.01 0.04
I
I
= 0mA to 200mA
= 0mA to 500mA
= 3V to 5.5V
OUT
OUT
%/mA
LOAD
--
2.2
--
--
--
--
0.4
100
1
V
EN, EN Input High Threshold
EN, EN Input Low Threshold
EN, EN Bias Current
V
V
V
V
IH
IN
IN
V
= 3V to 5.5V
IL
--
--
nA
μA
°C
dB
I
I
SD
Shutdown Supply Current
Thermal Shutdown Temperature
Ripple Rejection
--
0.01
155
58
V
OUT
= 0V
GSD
--
--
T
SD
PSRR
--
--
F = 100Hz, CBP = 10nF, C
= 10μF
OUT
DS9168/A-15 March 2007
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3
RT9168/A
Note 1. θJA is measured in the natural convection at TA = 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard.
Note 2. The dropout voltage is defined as VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) − 100mV.
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DS9168/A-15 March 2007
RT9168/A
Typical Operating Characteristics
GND Current vs. Temperature
Output Voltage vs. Temperature
120
105
90
75
60
45
30
15
0
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.26
VOUT = 3.3V
100 125 150
VOUT = 3.3V
3.25
-50
-25
0
25
50
75
-50
-25
0
25
50
75
100 125 150
Temperature (°C)
Temperature (°C)
Dropout Voltage vs. Output Current
Current Limit vs. Temperature
480
420
360
300
240
180
120
60
300
250
200
150
100
50
85°C
25°C
-40°C
RT9168
VOUT = 3.3V
VOUT = 3.3V
0
0
-50
-25
0
25
50
75
100 125 150
0
25
50
75
100 125 150 175 200
Temperature (°C)
Output Current (mA)
Current Limit vs. Temperature
PSRR
70
60
50
40
30
20
10
0
900
800
700
600
500
400
300
200
100
VOUT = 3.3V, ILOAD = 1mA
RT9168A
C
OUT = 4.7V
VOUT = 3.3V
10
1
100
1K
10K
100K
1M
-50
-25
0
25
50
75
100 125 150
Frequency (kHz)
Temperature
(°C)
DS9168/A-15 March 2007
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RT9168/A
Load Transient Response
Load Transient Response
60
40
20
0
60
40
20
0
C
= 10uF
V
= 4V
C
= 10uF
IN
V
= 4V
IN
IN
IN
COUT = 1uF
VOUT = 3.0V
COUT = 4.7uF
VOUT = 3.0V
-20
-20
≈
≈
≈
≈
50
1
50
1
-50
-50
Time (50us/Div)
Time (50us/Div)
Line Transient Response
Line Transient Response
150
100
50
150
VOUT = 3.0V
OUT = 1uF
Loading = 1mA
Loading = 50mA
VOUT = 3.0V
C
100 COUT = 1uF
50
0
0
-50
-50
≈
≈
≈
≈
5
4
5
4
Time (1ms/Div)
Time (1ms/Div)
Line Transient Response
Line Transient Response
150
100
50
60
40
20
0
VOUT = 3.0V
OUT = 4.7uF
VOUT = 3.0V
OUT = 4.7uF
Loading = 1mA
Loading = 50mA
C
C
0
-50
-20
≈
≈
≈
≈
5
4
5
4
Time (500us/Div)
Time (500us/Div)
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DS9168/A-15 March 2007
RT9168/A
Application Information
Region of Stable Cout ESR v.s Load Current
100
Capacitor Selection and Regulator Stability
Unstable Region
Stable Region
COUT = 4.7uF
COUT = 1uF
Like any low-dropout regulator, the external capacitors used
with the RT9168/A must be carefully selected for regulator
stability and performance.
10
1
Using a capacitor whose value is > 1μF on the
RT9168/A input and the amount of capacitance can be
increased without limit. The input capacitor must be
located not more than 0.5" 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.
0.1
Unstable Region
0.01
0.001
0
40
80
120
160
200
Load Current (mA)
Figure 1
The output capacitor must meet both requirements for
minimum amount of capacitance and ESR in all LDO
applications. The RT9168/A 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 > 5mΩ
on the RT9168/A output ensures stability. The
RT9168/A 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 voltages and 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" from the VOUT pin of the RT9168/Aand returned to a
clean analog ground.
Tantalum capacitors maybe suffer failure due to surge
current when it is connected to a low-impedance source
of power (like a battery or very large capacitor). If a
tantalum capacitor is used at the input, it must be
guaranteed to have a surge current rating sufficient for
the application by the manufacture.
Load-Transient Considerations
The RT9168/Aload-transient response graphs (see Typical
Operating Characteristics) show two components of the
output response: a DC shift from the output impedance
due to the load current change, and the transient response.
The DC shift is quite small due to the excellent load
regulation of the IC. Typical output voltage transient spike
for a step change in the load current from 0mAto 50mAis
tens mV, depending on the ESR of the output capacitor.
Increasing the output capacitor's value and decreasing the
ESR attenuates the overshoot.
Note that some ceramic dielectrics exhibit large
capacitance and ESR variation with temperature. It may
be necessary to use 2.2μF or more to ensure stability at
temperatures below -10°C in this case. Also, tantalum
capacitors, 2.2μF or more may be needed to maintain
capacitance and ESR in the stable region for strict
application environment.
Shutdown Input Operation
The RT9168/A is shutdown by pulling the EN input low,
and turned on by driving the input high. If this feature is
not to be used, the EN input should be tied to VIN to
keep the regulator on at all times (the EN input must not
be left floating).
DS9168/A-15 March 2007
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7
RT9168/A
To ensure proper operation, the signal source used to
drive the ENinput must be able to swing above and below
the specified turn-on/turn-off voltage thresholds which
guarantee an ONor OFF state (see Electrical Characteristics).
The ON/OFF signal may come from either CMOS output,
or an open-collector output with pull-up resistor to the
RT9168/Ainput voltage or another logic supply. The high-
3). As shown, the Schottky diode is connected in parallel
with the internal parasitic diode and prevents it from being
turned on by limiting the voltage drop across it to about
0.3V. < 100 mA to prevent damage to the part.
level voltage may exceed the
RT9168/Ainput voltage,
VIN
VOUT
but must remain within the absolute maximum ratings
for the EN pin.
Internal P-Channel Pass Transistor
Figure 2
The RT9168/Afeatures a typical 1.1Ω P-channel MOSFET
pass transistor. It provides several advantages over similar
designs using PNP pass transistors, including longer
battery life. The P-channel MOSFET requires no base
drive, which reduces quiescent current considerably. PNP-
based regulators waste considerable current in dropout
when the pass transistor saturates. They also use high
base-drive currents under large loads. The RT9168/Adoes
not suffer from these problems and consume only 80μA of
quiescent current whether in dropout, light-load, or heavy-
load applications.
VIN
VOUT
Figure 3
Current Limit and Thermal Protection
Input-Output (Dropout) Voltage
The RT9168 includes a current limit which monitors and
controls the pass transistor's gate voltage limiting the
output current to 300mATyp. (700mATyp. for RT9168A).
Thermal-overload protection limits total power dissipation
in the RT9168/A. When the junction temperature exceeds
TJ = +155°C, the thermal sensor signals the shutdown
logic turning off the pass transistor and allowing the IC to
cool. The thermal sensor will turn the pass transistor on
again after the IC's junction temperature cools by 10°C,
resulting in a pulsed output during continuous thermal-
overload conditions. Thermal-overloaded protection is
designed to protect the RT9168/A in the event of fault
conditions. Do not exceed the absolute maximum
junction-temperature rating of TJ = +150°C for continuous
operation. The output can be shorted to ground for an
A regulator's minimum input-output voltage differential (or
dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this will determine
the useful end-of-life battery voltage. Because the
RT9168/A uses a P-channel MOSFET pass transistor,
the dropout voltage is a function of drain-to-source on-
resistance [RDS(ON)] multiplied by the load current.
Reverse Current Path
The power transistor used in the RT9168/Ahas an inherent
diode connected between the regulator input and output
(see Figure 2). If the output is forced above the input by
more than a diode-drop, this diode will become forward
biased and current will flow from the VOUT terminal to VIN.
This diode will also be turned on by abruptly stepping the
input voltage to a value below the output voltage. To prevent
regulator mis-operation, a Schottky diode should be used
in any applications where input/output voltage conditions
can cause the internal diode to be turned on (see Figure
indefinite amount of time without damaging the part by
cooperation of current limit and thermal protection.
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DS9168/A-15 March 2007
RT9168/A
Operating Region and Power Dissipation
The maximum power dissipation of RT9168/A depends
on the thermal resistance of the case and circuit board,
the temperature difference between the die junction and
ambient air, and the rate of airflow. The power dissipation
across the device is P = IOUT (VIN - VOUT). The maximum
power dissipation is: PMAX = (TJ - TA) /θJA
where TJ - TA is the temperature difference between the
RT9168/Adie junction and the surrounding environment,
θJA is the thermal resistance from the junction to the
surrounding environment. The GND pin of the RT9168/A
performs the dual function of providing an electrical
connection to ground and channeling heat away. Connect
theGNDpin to ground using a large pad or ground plane.
DS9168/A-15 March 2007
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9
RT9168/A
Outline Dimension
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
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
b
C
D
e
H
L
SOT-23-5 Surface Mount Package
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DS9168/A-15 March 2007
RT9168/A
H
A
M
J
B
F
C
I
D
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
B
C
D
F
H
I
4.801
3.810
1.346
0.330
1.194
0.170
0.050
5.791
0.400
5.004
3.988
1.753
0.508
1.346
0.254
0.254
6.200
1.270
0.189
0.150
0.053
0.013
0.047
0.007
0.002
0.228
0.016
0.197
0.157
0.069
0.020
0.053
0.010
0.010
0.244
0.050
J
M
8-Lead SOP Plastic Package
Richtek Technology Corporation
Headquarter
Richtek Technology Corporation
Taipei Office (Marketing)
5F, No. 20, Taiyuen Street, Chupei City
Hsinchu, Taiwan, R.O.C.
8F, No. 137, Lane 235, Paochiao Road, Hsintien City
Taipei County, Taiwan, R.O.C.
Tel: (8863)5526789 Fax: (8863)5526611
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek.com
DS9168/A-15 March 2007
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11
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