RT9168-A-17CSH [ETC]
200MA / 500MA FIXED OUTPUT VOLTAGE LDO REGULATOR; 200MA / 500MA固定输出电压LDO稳压器
| 型号： | RT9168-A-17CSH |
| 厂家： | 
ETC |
| 描述： | 200MA / 500MA FIXED OUTPUT VOLTAGE LDO REGULATOR |
| 文件： | 总13页 (文件大小：236K) |
| 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
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/A is designed for use with very low ESR
capacitors. The output remains stable even with a
1µF ceramic output capacitor.
z Stable with Low-ESR Output Capacitor
z Low Dropout Voltage (220mV at 200mA)
z Low Operation Current - 80µA Typical
z Shutdown Function
z Low Temperature Coefficient
z Current and Thermal Limiting
z Custom Voltage Available
z SOT-25 and SOP-8 Packages
The RT9168/A uses 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 SOP-8 and SOT-25 packages are
also available for larger power dissipation and
design flexibility.
Pin Configurations
Part Number
Pin Configurations
TOP VIEW
RT9168/A-ꢀꢀCBR
(Plastic SOT-25)
5
4
1. OUT
2. GND
3. IN
4. SHDN
5. NC
1
2
3
TOP VIEW
RT9168/A-ꢀꢀCS
RT9168/A-ꢀꢀCSH
(Plastic SOP-8)
Applications
8
IN
OUT
GND
1
2
z Cellular Telephones
7
6
5
GND
z Laptop, Notebook, and Palmtop Computers
z Battery-powered Equipment
z Hand-held Equipment
GND
NC
3
4
GND
SHDN/SHDN
Ordering Information
Typical Application Circuit
RT9168/A-ꢀꢀ ꢀ ꢀꢀ
Package type
BR : SOT-25
S : SOP-8
SH : SOP-8, High shutdown
RT9168
V
V
IN
OUT
IN
OUT
C
IN
C
OUT
GND
1µF
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
:
1µF
SHDN
SHDN
NC
:
49 : 4.9V
50 : 5.0V
500mA Output current
200mA Output current
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RT9168/A
Marking Information
Part Number
Marking
L0
Part Number
Marking
M0
RT9168-15CBR
RT9168-16CBR
RT9168-17CBR
RT9168-18CBR
RT9168-19CBR
RT9168-20CBR
RT9168-21CBR
RT9168-22CBR
RT9168-23CBR
RT9168-24CBR
RT9168-25CBR
RT9168-26CBR
RT9168-27CBR
RT9168-28CBR
RT9168-29CBR
RT9168-30CBR
RT9168-31CBR
RT9168-32CBR
RT9168-33CBR
RT9168-34CBR
RT9168-35CBR
RT9168-36CBR
RT9168-37CBR
RT9168-38CBR
RT9168-39CBR
RT9168-40CBR
RT9168-41CBR
RT9168-42CBR
RT9168-43CBR
RT9168-44CBR
RT9168-45CBR
RT9168-46CBR
RT9168-47CBR
RT9168-48CBR
RT9168-49CBR
RT9168-50CBR
RT9168A-15CBR
RT9168A-16CBR
RT9168A-17CBR
RT9168A-18CBR
RT9168A-19CBR
RT9168A-20CBR
RT9168A-21CBR
RT9168A-22CBR
RT9168A-23CBR
RT9168A-24CBR
RT9168A-25CBR
RT9168A-26CBR
RT9168A-27CBR
RT9168A-28CBR
RT9168A-29CBR
RT9168A-30CBR
RT9168A-31CBR
RT9168A-32CBR
RT9168A-33CBR
RT9168A-34CBR
RT9168A-35CBR
RT9168A-36CBR
RT9168A-37CBR
RT9168A-38CBR
RT9168A-39CBR
RT9168A-40CBR
RT9168A-41CBR
RT9168A-42CBR
RT9168A-43CBR
RT9168A-44CBR
RT9168A-45CBR
RT9168A-46CBR
RT9168A-47CBR
RT9168A-48CBR
RT9168A-49CBR
RT9168A-50CBR
L1
M1
L2
M2
L3
M3
L4
M4
L5
M5
L6
M6
L7
M7
L8
M8
L9
M9
LA
LB
LC
LD
LE
LF
MA
MB
MC
MD
ME
MF
MG
MH
MJ
LG
LH
LJ
LK
LL
MK
ML
LM
LN
LP
LQ
LR
LS
LT
MM
MN
MP
MQ
MR
MS
MT
MU
MV
MW
MX
MY
MZ
CN
CP
LU
LV
LW
LX
LY
LZ
CL
CM
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RT9168/A
Pin Description
Pin Name
IN
Pin Function
Input
GND
Ground
SHDN (SHDN) Active Low (High) Shutdown Input
NC
No Connection
Output
OUT
Function Block Diagram
SHDN
Shutdown
or
IN
and
SHDN
Logic Control
VREF
+
_
MOS Driver
OUT
GND
Error Amp
Current-Limit
and
Thermal
Protection
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RT9168/A
Absolute Maximum Ratings
z Input Voltage
8V
z Power Dissipation, P @ T = 25°C
D
A
SOT-25
SOP-8
0.25W
0.625W
z Operating Junction Temperature Range
z Storage Temperature Range
−40°C to 125°C
−65°C to 150°C
z Package Thermal Resistance
SOT-25, θ
250°C/W
160°C/W
260°C
JA
SOP-8, θ
JA
z Lead Temperature (Soldering, 5 sec.)
Electrical Characteristics
(V = 5.0V, C = 1µF, C
= 1µF, T = 25°C, unless otherwise specified)
A
IN
IN
OUT
Parameter
Symbol
Test Conditions
Min Typ Max Units
2.9
2.7
-2
200
500
--
--
--
7
7
Input Voltage Range
V
V
IN
I = 50mA
L
Output Voltage Accuracy
--
+2
--
%
∆V
I = 1mA
L
OUT
MAX
RT9168
--
mA
mA
mA
mA
Maximum Output
Current
I
I
RT9168A
RT9168
--
--
300
700
80
90
90
1.1
55
--
Current Limit
R
= 1 Ohm
LOAD
LIMIT
RT9168A
RT9168/A
RT9168
--
--
No Load
--
150
150
150
5
GND Pin Current
--
µA
I
G
I
I
I
I
I
I
= 200mA
OUT
OUT
OUT
OUT
OUT
OUT
RT9168A
RT9168/A
RT9168/A
RT9168/A
RT9168A
--
= 500mA
= 1mA
--
mV
mV
mV
mV
(Note)
Dropout Voltage
--
100
= 50mA
= 200mA
= 500mA
V
DROP
(V
(Nominal)≥3.0V
OUT
--
220 300
600 750
Version)
--
Line Regulation
Load Regulation
-0.2
--
--
+0.2 %/V
∆V
∆V
V
= (V
+0.15) to 7V, I = 1mA
OUT
LINE
IN
OUT
0.01 0.04
0.01 0.04
I
= 0mA to 200mA
OUT
OUT
%/mA
LOAD
--
I
= 0mA to 500mA
SHDN, SHDN Input High Threshold
SHDN, SHDN Input Low Threshold
SHDN, SHDN Bias Current
Shutdown Supply Current
2.2
--
--
--
--
0.4
100
1
V
V
V
V
V
= 3V to 5.5V
= 3V to 5.5V
IH
IN
IN
V
IL
--
--
nA
µA
°C
dB
I
SD
--
0.01
155
58
I
V
OUT
= 0V
GSD
Thermal Shutdown Temperature
Ripple Rejection
--
--
T
SD
PSRR
--
--
F = 100Hz, C = 10nF, C
= 10µF
OUT
BP
Notes: Dropout voltage definition: V - V
when V
is 50 mV below the value of V
at V = V
+ 0.5V
IN
OUT
OUT
OUT
IN
OUT
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RT9168/A
Typical Operating Charateristics
Output Voltage vs. Temp.
GND Current vs. Temp.
3.33
120
105
90
75
60
45
30
15
0
3.32
3.31
3.30
3.29
3.28
3.27
3.26
VOUT = 3.3V
VOUT = 3.3V
3.25
-50
-25
0
25
50
75
100 125 150
-50
-25
0
25
50
75
100 125 150
Temperature (°C)
°C )
Temperature (
Dropout Voltage vs. Output Current
Current Limit vs. Temp.
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. Temp.
PSRR
70
60
50
40
30
20
10
0
900
800
700
600
500
400
300
200
100
RT9168A
VOUT = 3.3V
ILOAD = 1mA, COUT = 4.7µF
VOUT = 3.3V
10
100
1K
Frequency (KHz)
10K
100K
1M
-50
-25
0
25
50
75
°C )
100 125 150
0
Temperature (
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RT9168/A
Load Transient Response
Load Transient Response
60
40
20
60
40
20
VOUT = 3.0V
IN = 4V
VOUT = 3.0V
VIN = 4V
COUT = 1µF
CIN = 10µF
COUT = 4.7µF
IN = 10µF
V
C
T
T
>
>
0
0
-20
-20
≈
≈
≈
≈
≈
≈
≈
≈
50
50
T
T
>
>
1
1
-50
-50
Time (50µS/Div)
Time (50µS/Div)
Line Transient Response
Line Transient Response
150
100
50
150
100
50
COUT = 1µF
COUT = 1µF
VOUT = 3.0V
VOUT = 3.0V
Loading = 1mA
Loading = 50mA
T
T
>
>
0
0
-50
-50
≈
≈
5
4
5
4
T
T
1↓
1↓
Time (1mS/Div)
Time (1mS/Div)
Line Transient Response
Line Transient Response
150
100
50
60
40
20
COUT = 4.7µF
COUT = 4.7µF
VOUT = 3.0V
VOUT = 3.0V
Loading = 1mA
Loading = 50mA
T
T
>
>
0
0
-50
-20
≈
≈
5
4
5
4
T
T
1↓
1↓
Time (500µS/Div)
Time (500µS/Div)
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DS9168/A-03 May 2001
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RT9168/A
Applications Guides
Capacitor Selection and Regulator Stability
Region of Stable C
ESR vs. Load Current
100
Like any low-dropout regulator, the external capacitors
used with the RT9168/A must be carefully selected for
regulator stability and performance.
C
= 4.7µF
OUT
10
C
= 1µF
OUT
1
0.1
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.
0.01
0.001
0
40
80
120
160
200
Load Current (mA)
Fig. 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-
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.
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. Fig.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
Load-Transient Considerations
The RT9168/A load-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 0mA to 50mA is tens
mV, depending on the ESR of the output capacitor.
Increasing the output capacitor’s value and
decreasing the ESR attenuates the overshoot.
0.5" from the V
pin of the RT9168/A and returned
OUT
to a clean analog ground.
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 SHDN
input low, and turned on by driving the input high. If
this feature is not to be used, the SHDN input should
be tied to VIN to keep the regulator on at all times
(the SHDN input must not be left floating).
DS9168/A-03 May 2001
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RT9168/A
To ensure proper operation, the signal source used to
drive the SHDN input must be able to swing above and
below the specified turn-on/turn-off voltage thresholds
which guarantee an ON or 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/A input voltage or
another logic supply. The high-level voltage may
exceed the RT9168/A input voltage, but must remain
within the absolute maximum ratings for the SHDN pin.
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 Fig.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.
Internal P-Channel Pass Transistor
V
V
IN
OUT
The RT9168/A features 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/A does not
suffer from these problems and consume only 80µA of
quiescent current whether in dropout, light-load, or
heavy-load applications.
Fig. 2
V
IN
V
OUT
Fig. 3
Input-Output (Dropout) Voltage
A
regulator’s minimum input-output voltage
Current Limit and Thermal Protection
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
The RT9168 includes a current limit which monitors
and controls the pass transistor’s gate voltage limiting
the output current to 300mA Typ. (700mA Typ. for
RT9168A). Thermal-overload protection limits total
power dissipation in the RT9168/A. When the junction
temperature exceeds T = +155°C, the thermal sensor
J
[R
multiplied by the load current.
DS(ON)]
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-
Reverse Current Path
The power transistor used in the RT9168/A has an
inherent diode connected between the regulator
input and output (see Fig.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 V
terminal to V . This diode will
OUT
IN
temperature rating of T = +150°C for continuous
J
also be turned on by abruptly stepping the input
voltage to a value below the output voltage. To
operation. The output can be shorted to ground for an
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DS9168/A-03 May 2001
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RT9168/A
indefinite amount of time without damaging the part by
cooperation of current limit and thermal protection.
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 = I
(V - V
).
OUT
IN
OUT
The maximum power dissipation is: PMAX = (T - T )
J
A
/θ
JA
where T - T is the temperature difference between
J
A
the RT9168/A die junction and the surrounding
environment, θ is the thermal resistance from the
JA
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 the GND pin to ground
using a large pad or ground plane.
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RT9168/A
Package Information
D
b
C
B
H
A
L
e
A1
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
0.102
0.356
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
0.004
0.014
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- 25 Surface Mount Package
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RT9168/A
H
A
M
B
J
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
0.178
0.102
5.791
0.406
5.004
3.988
1.753
0.508
1.346
0.254
0.254
6.198
1.270
0.189
0.150
0.053
0.013
0.047
0.007
0.004
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
DS9168/A-03 May 2001
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RT9168/A
RICHTEK TECHNOLOGY CORP.
Headquarter
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
6F, No. 35, Hsintai Road, Chupei City
8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City
Hsinchu, Taiwan, R.O.C.
Taipei County, Taiwan, R.O.C.
Tel: (8863)5510047 Fax: (8863)5537749
Tel: (8862)89191466 Fax: (8862)89191465
Email: marketing@richtek-ic.com.tw
DS9168/A-03 May 2001
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13
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