RT9167A-31CS [ETC]
LOW NOISE FIXED OUTPUT VOLTAGE 200MA/500MA LDO REGULATOR; 低噪声固定输出电压200MA / 500MA LDO稳压器型号: | RT9167A-31CS |
厂家: | ETC |
描述: | LOW NOISE FIXED OUTPUT VOLTAGE 200MA/500MA LDO REGULATOR |
文件: | 总14页 (文件大小:257K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
RT9167/A
Low-Noise, Fixed Output Voltage,
200mA/500mA LDO Regulator
General Description
Features
The RT9167/A is a 200mA/500mA low dropout and
low noise micropower regulator suitable for portable
applications. The output voltages range from 1.5V to
5.0V in 100mV increments and 2% accuracy. The
RT9167/A is designed for use with very low ESR
capacitors. The output remains stable even with 1µF
ceramic output capacitor.
z Stable with Low-ESR Output Capacitor
z Low Dropout Voltage (220mV and 200mA)
z Low Operation Current - 80µA Typical
z Shutdown Function
z Low Noise Output
z Low Temperature Coefficient
z Current and Thermal Limiting
z Custom Voltage Available
The RT9167/A uses and 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-power devices. Other features
include a reference bypass pin to improve low noise
performance, current limiting, and over temperature
protection.
z SOT-25 and SOP-8 Packages
Applications
z Cellular Telephones
z Laptop, Notebook, and Palmtop Computers
z Battery-powered Equipment
z Hand-held Equipment
Pin Configurations
Ordering Information
Part Number
Pin Configurations
RT9167/A-ꢀꢀ ꢀ ꢀꢀ
Package type
TOP VIEW
RT9167/A-ꢀꢀCB
(Plastic SOT-25)
5
4
1. IN
B : SOT-25 Type I
BR : SOT-25 Type II
S : SOP-8
2. GND
3. SHDN
4. BP
1
2
3
5. OUT
Operating temperature range
C: Commercial standard
Output voltage
15 : 1.5V
16 : 1.6V
:
TOP VIEW
RT9167/A-ꢀꢀCBR
(Plastic SOT-25)
5
1
4
3
1. OUT
2. GND
3. IN
4. SHDN
5. BP
2
:
TOP VIEW
49 : 4.9V
50 : 5.0V
RT9167/A-ꢀꢀCS
(Plastic SOP-8)
GND
GND
SHDN 1
IN 2
8
7
6
5
500mA Output current
200mA Output current
OUT 3
GND
GND
4
BP
DS9167/A-10 July 2001
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1
RT9167/A
Marking Information
Part Number
RT9167-15CB
RT9167-16CB
RT9167-17CB
RT9167-18CB
RT9167-19CB
RT9167-20CB
RT9167-21CB
RT9167-22CB
RT9167-23CB
RT9167-24CB
RT9167-25CB
RT9167-26CB
RT9167-27CB
RT9167-28CB
RT9167-29CB
RT9167-30CB
RT9167-31CB
RT9167-32CB
RT9167-33CB
RT9167-34CB
RT9167-35CB
RT9167-36CB
RT9167-37CB
RT9167-38CB
RT9167-39CB
RT9167-40CB
RT9167-41CB
RT9167-42CB
RT9167-43CB
RT9167-44CB
RT9167-45CB
RT9167-46CB
RT9167-47CB
RT9167-48CB
RT9167-49CB
Marking
Part Number
Marking
AS
J0
E0
E1
E2
E3
E4
E5
E6
E7
E8
E9
EA
EB
EC
ED
EE
EF
EG
EH
EJ
RT9167-50CB
RT9167A-15CB
RT9167A-16CB
RT9167A-17CB
RT9167A-18CB
RT9167A-19CB
RT9167A-20CB
RT9167A-21CB
RT9167A-22CB
RT9167A-23CB
RT9167A-24CB
RT9167A-25CB
RT9167A-26CB
RT9167A-27CB
RT9167A-28CB
RT9167A-29CB
RT9167A-30CB
RT9167A-31CB
RT9167A-32CB
RT9167A-33CB
RT9167A-34CB
RT9167A-35CB
RT9167A-36CB
RT9167A-37CB
RT9167A-38CB
RT9167A-39CB
RT9167A-40CB
RT9167A-41CB
RT9167A-42CB
RT9167A-43CB
RT9167A-44CB
RT9167A-45CB
RT9167A-46CB
RT9167A-47CB
RT9167A-48CB
J1
J2
J3
J4
J5
J6
J7
J8
J9
JA
JB
JC
JF
JE
JD
JG
JH
JJ
EK
EL
EM
EN
EP
EQ
ER
ES
ET
EU
EV
EW
EX
EY
EZ
AR
JK
JL
JM
JN
JP
JQ
JR
JS
JT
JU
JV
JW
JX
JY
JZ
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DS9167/A-10 July 2001
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RT9167/A
Part Number
Marking
CA
CB
I0
Part Number
Marking
CZ
K0
RT9167A-49CB
RT9167A-50CB
RT9167-15CBR
RT9167-16CBR
RT9167-17CBR
RT9167-18CBR
RT9167-19CBR
RT9167-20CBR
RT9167-21CBR
RT9167-22CBR
RT9167-23CBR
RT9167-24CBR
RT9167-25CBR
RT9167-26CBR
RT9167-27CBR
RT9167-28CBR
RT9167-29CBR
RT9167-30CBR
RT9167-31CBR
RT9167-32CBR
RT9167-33CBR
RT9167-34CBR
RT9167-35CBR
RT9167-36CBR
RT9167-37CBR
RT9167-38CBR
RT9167-39CBR
RT9167-40CBR
RT9167-41CBR
RT9167-42CBR
RT9167-43CBR
RT9167-44CBR
RT9167-45CBR
RT9167-46CBR
RT9167-47CBR
RT9167-48CBR
RT9167-49CBR
RT9167-50CBR
RT9167A-15CBR
RT9167A-16CBR
RT9167A-17CBR
RT9167A-18CBR
RT9167A-19CBR
RT9167A-20CBR
RT9167A-21CBR
RT9167A-22CBR
RT9167A-23CBR
RT9167A-24CBR
RT9167A-25CBR
RT9167A-26CBR
RT9167A-27CBR
RT9167A-28CBR
RT9167A-29CBR
RT9167A-30CBR
RT9167A-31CBR
RT9167A-32CBR
RT9167A-33CBR
RT9167A-34CBR
RT9167A-35CBR
RT9167A-36CBR
RT9167A-37CBR
RT9167A-38CBR
RT9167A-39CBR
RT9167A-40CBR
RT9167A-41CBR
RT9167A-42CBR
RT9167A-43CBR
RT9167A-44CBR
RT9167A-45CBR
RT9167A-46CBR
RT9167A-47CBR
RT9167A-48CBR
RT9167A-49CBR
RT9167A-50CBR
K1
I1
K2
I2
K3
I3
K4
I4
K5
I5
K6
I6
K7
I7
K8
I8
K9
I9
KA
KB
KC
KD
KE
KF
KG
KH
KJ
IA
IB
IC
ID
IE
IF
IG
IH
IJ
KK
KL
IK
IL
KM
KN
KP
KQ
KR
KS
KT
KU
KV
KW
KX
KY
KZ
CC
CD
IM
IN
IP
IQ
IR
IS
IT
IU
IV
IW
IX
IY
IZ
CY
DS9167/A-10 July 2001
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3
RT9167/A
Pin Description
Pin Name
IN
Pin Function
Input
GND
SHDN
BP
Ground
Active Low Shutdown Input
Reference Noise Bypass
Output
OUT
Function Block Diagram
Shutdown
and
IN
SHDN
Logic Control
VREF
BP
MOS Driver
_
OUT
GND
Error Amp
Current-Limit
and
Thermal
Protection
Typical Application Circuit
RT9167
V
V
OUT
IN
IN
OUT
C
IN
C
OUT
GND
1µF
1µF
ON
BP
SHDN
C
BP
OFF
10nF
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DS9167/A-10 July 2001
4
RT9167/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
RT9167
--
Maximum Output
Current
mA
I
I
RT9167A
RT9167
--
--
300
700
80
90
90
1.1
55
--
Current Limit
mA
R
= 1Ω
LOAD
LIMIT
RT9167A
RT9167/A
RT9167
--
--
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
RT9167A
RT9167/A
RT9167/A
RT9167/A
RT9167A
--
= 500mA
= 1mA
--
(Note)
Dropout Voltage
--
100
= 50mA
= 200mA
= 500mA
mV
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
RT9167
0.01 0.04
0.01 0.04
I
= 0mA to 200mA
OUT
OUT
%/mA
LOAD
RT9167A
--
I
= 0mA to 500mA
SHDN Input High Threshold
SHDN Input Low Threshold
SHDN Bias Current
1.6
--
--
--
--
0.4
100
1
V
V
V
V
V
V
= 3V to 5.5V
= 3V to 5.5V
IH
IN
IN
IL
--
--
nA
µA
°C
I
I
SD
Shutdown Supply Current
Thermal Shutdown Temperature
--
0.01
155
V
= 0V
OUT
GSD
--
--
T
e
SD
Output Noise
--
350
58
--
C
= 10nF, C = 10µF
OUT
nV Hz
NO
BP
Ripple Rejection
PSRR
--
--
dB
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
DS9167/A-10 July 2001
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5
RT9167/A
Typical Operating Charateristics
Output Voltage vs. Temp.
GND Current vs. Temp.
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
VOUT = 3.3V
3.25
-50
-25
0
25
50
75
100 125 150
-50
-25
0
25
50
75
100 125 150
Temperature (
)
°
Temperature (°C)
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
RT9167
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 (
)
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
ILOAD = 1mA, COUT = 4.7µF
VOUT = 3.3V, CBP = 10nF
RT9167A
VOUT = 3.3V
10
100
1K
Frequency (KHz)
10K
100K
1M
-50
-25
0
25
50
75
°
100 125 150
)
Temperature (
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DS9167/A-10 July 2001
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RT9167/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
CIN = 10µF
V
C
BP = 10nF
CBP = 10nF
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
CBP = 10nF
COUT = 1µF
CBP = 10nF
VOUT = 3.0V
VOUT = 3.0V
Loading = 50mA
Loading = 1mA
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
CBP = 10nF
CBP = 10nF
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)
DS9167/A-10 July 2001
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7
RT9167/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 RT9167/A must be carefully selected for
regulator stability and performance.
C
= 4.7µF
OUT
10
C
= 1µF
OUT
Using a capacitor whose value is > 1µF on the
RT9167/A 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" 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.
1
0.1
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 LDOs
application. The RT9167/A is designed specifically to
work with low ESR ceramic output capacitor in space-
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.
saving and performance consideration. Using
a
ceramic capacitor whose value is at least 1uF with
ESR is > 5mΩ on the RT9167/A output ensures
stability. The RT9167/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
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.
0.5" from the V
to a clean analog ground.
pin of the RT9167/A and returned
OUT
Use a 10nF bypass capacitor at BP for low output
voltage noise. The capacitor, in conjunction with an
internal 200KΩ resistor, which connects bypass pin
and the band-gap reference, creates an 80Hz low-
pass filter for noise reduction. Increasing the
capacitance will slightly decrease the output noise,
but increase the start-up time. The capacitor
connected to the bypass pin for noise reduction must
have very low leakage. This capacitor leakage
current causes the output voltage to decline by a
proportional amount to the current due to the voltage
drop on the internal 200KΩ resistor. Fig. 2 shows the
power on response.
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DS9167/A-10 July 2001
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RT9167/A
Internal P-Channel Pass Transistor
C
= 1nF
BP
The RT9167/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 RT9167/A does not
suffer from these problems and consume only 80µA of
quiescent current whether in dropout, light-load, or
heavy-load applications.
C
= 10nF
BP
V
= 3.0V
OUT
0
5.0
10.0
15.0
Fig. 2
Input-Output (Dropout) Voltage
A
regulator’s minimum input-output voltage
Load-Transient Considerations
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 RT9167/A uses a P-
channel MOSFET pass transistor, the dropout
voltage is a function of drain-to-source on-resistance
The RT9167/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.
[R
] multiplied by the load current.
DS(ON)
Reverse Current Path
The power transistor used in the RT9167/A has an
inherent diode connected between the regulator
input and output (see Fig.3). If the output is forced
above the input by more than a diode-drop, this
diode will become forward biased and current will
Shutdown Input Operation
The RT9167/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).
flow from the V
terminal to V . This diode will
OUT
IN
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 Fig.4). 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.
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 RT9167/A input voltage or
another logic supply. The high-level voltage may
exceed the RT9167/A input voltage, but must remain
within the absolute maximum ratings for the SHDN pin.
DS9167/A-10 July 2001
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9
RT9167/A
Current Limit and Thermal Protection
The RT9167 includes a current limit which monitors
and controls the pass transistor’s gate voltage limiting
the output current to 300mA Typ. (700mA Typ. for
RT9167A). Thermal-overload protection limits total
power dissipation in the RT9167/A. When the junction
V
V
IN
OUT
Fig. 3
temperature exceeds T = +155°C, the thermal sensor
J
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 RT9167/A in the event of fault conditions.
Do not exceed the absolute maximum junction-
V
V
IN
OUT
temperature rating of T = +150°C for continuous
J
Fig. 4
operation. The output can be shorted to ground for an
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 RT9167/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
OUT
(V - V
). The maximum power dissipation is:
IN
OUT
PMAX = (T - T ) /θ
J
A
JA
where T - T is the temperature difference between
J
A
the RT9167/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 RT9167/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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RT9167/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
DS9167/A-10 July 2001
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11
RT9167/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
www.richtek-ic.com.tw
DS9167/A-10 July 2001
12
RT9167/A
DS9167/A-10 July 2001
www.richtek-ic.com.tw
13
RT9167/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
www.richtek-ic.com.tw
DS9167/A-10 July 2001
14
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