SC8863_05 [SEMTECH]
150mA Ultra Low Dropout, Low Noise Regulator; 150毫安超低压差，低噪声稳压器
| 型号： | SC8863_05 |
| 厂家： | 
SEMTECH CORPORATION |
| 描述： | 150mA Ultra Low Dropout, Low Noise Regulator |
| 文件： | 总11页 (文件大小：225K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC8863
150mA Ultra Low Dropout,
Low Noise Regulator
POWER MANAGEMENT
Description
Features
The SC8863 is a low dropout linear regulator that
operates from a +2.5V to +6.0V input range and
delivers up to 150mA. A PMOS pass transistor allows
the low 110µA supply current to remain independent of
load, making these devices ideal for battery operated
portable equipment such as cellular phones, cordless
phones and personal digital assistants.
Guaranteed 150mA output current
Works with ceramic capacitors
Fixed or adjustable output
Very small external components
Low 75µVRMS output noise
Very low supply current
Thermal overload protection
Reverse battery protection
Low power shutdown
Full industrial temperature range
Very low profile packaging available (1mm max.
height)
Surface mount packaging (SOT-23-5 and
TSOT-23-5)
The SC8863 output voltage can be preset or adjusted
with an external resistor divider. Other features include
low power shutdown, short circuit protection, thermal
shutdown protection and reverse battery protection. The
SC8863 comes in the tiny 5 lead SOT-23 package (lead
free, fully WEEE and RoHS compliant available) and the
ultra low profile 5 lead TSOT-23.
Applications
Battery Powered Systems
Cellular Telephones
Cordless Telephones
Personal Digital Assistants
Portable Instrumentation
Modems
PCMCIA cards
Typical Application Circuits
U1
IN
SC8863
3
1
4
VIN > VOUT + VD(MAX)
VOUT @ IOUT up to 150mA
OUT
5
EN
SET
GND
2
C1
C2
1uF Ceramic
1uF Ceramic
Internally Preset Output Voltage
U1
IN
SC8863
OUT
3
1
4
5
VIN > VOUT + VD(MAX)
VOUT @ IOUT up to 150mA
R1
EN
SET
GND
2
R1
R2
VOUT = 1.250 • 1+
R2
C1
10k
C2
2.2uF Ceramic
1uF Ceramic
Externally Preset Output Voltage(1)
Note:
(1) Select R1 and R2 such that the current flowing through them is ≥ 10µA (i.e. R2 ≤ 120kΩ). A value of 10kΩ
is recommended for R2. Please see Component Selection - Externally Set Output on page 7.
Revision: November 8, 2005
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SC8863
POWER MANAGEMENT
Absolute Maximum Ratings
Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified
in the Electrical Characteristics section is not implied.
Parameter
Symbol
Maximum
Units
EN, IN, OUT, SET to GND
VPIN
tSC
-0.3 to +7
Infinite
V
s
Output Short Circuit Duration
Thermal Resistance, Junction to Ambient
Thermal Resistance, Junction to Case
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
256
°C/W
°C/W
°C
θJA
81
θJC
TA
-40 to +85
-40 to +150
-65 to +150
300
TJ
°C
TSTG
TLEAD
°C
Lead Temperature (Soldering) 10 sec
°C
Electrical Characteristics(1)
Unless specified: VIN = 3.6V, VSET = GND, VEN = VIN, TA = 25°C. Values in bold apply over full operating ambient temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
IN
Supply Voltage Range
Supply Current
VIN
IQ
2.5
6.0
130
160
160
200
1
V
IOUT = 0mA
100
110
µA
50mA ≤ IOUT ≤ 150mA
µA
µA
V
EN = 0V
0.0001
2
OUT
Output Voltage(2)
VOUT
IOUT = 1mA
-2.0%
VOUT
+2.0%
+3.5%
10
V
1mA ≤ IOUT ≤ 150mA, VOUT + 1V ≤ VIN ≤ 5.5V -3.5%
2.5V ≤ VIN ≤ 5.5V, VSET = VOUT, IOUT = 1mA
Line Regulation(2)
Load Regulation(2)
REG(LINE)
REG(LOAD)
5
mV
mV
mV
12
IOUT = 0mA to 50mA
IOUT = 0mA to 100mA
-10
-15
-15
-20
-20
-25
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SC8863
POWER MANAGEMENT
Electrical Characteristics (Cont.)(1)
Unless specified: VIN = 3.6V, VSET = GND, VEN = VIN, TA = 25°C. Values in bold apply over full operating ambient temperature range.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Load Regulation (Cont.)(2) REG(LOAD)
IOUT = 0mA to 50mA, VSET = VOUT
-2.5
-7.5
-15.0
-15
mV
IOUT = 0mA to 100mA, VSET = VOUT
-5
mV
-30
Dropout Voltage(2)(3)
VD
IOUT = 1mA
1.1
55
mV
mV
IOUT = 50mA
90
120
180
240
350
IOUT = 100mA
110
mV
Current Limit
ILIM
en
150
1.8
240
90
mA
Output Voltage Noise
10Hz to 99kHz, IOUT = 50mA, COUT = 1µF
10Hz to 99kHz, IOUT = 50mA, COUT = 100µF
f ≤ 1kHz
µVRMS
75
Power Supply Rejection
Ratio
PSRR
55
dB
EN
EN Input Threshold
VIH
VIL
IEN
V
0.4
100
200
EN Input Bias Current(4)
VEN = VIN
0
nA
SET
Sense/Select Threshold
SET Reference Voltage(2)
VTH
20
55
80
mV
V
VSET
IOUT = 1mA
1mA ≤ IOUT ≤ 150mA, 2.5V ≤ VIN ≤ 5.5V
VSET = 1.3V
1.225
1.206
1.250
1.275
1.294
2.500
5.000
SET Input Leakage
Current(4)
ISET
0.015
nA
Over Temperature Protection
High Trip Level
THI
THYST
170
10
°C
°C
Hysteresis
Notes:
(1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
(2) Low duty cycle pulse testing with Kelvin connections required.
(3) Defined as the input to output differential at which the output voltage drops 100mV below the value measured
at a differential of 2V.
(4) Guaranteed by design.
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SC8863
POWER MANAGEMENT
Pin Configuration
Ordering Information
Part Number
Package
Top View
SC8863-XXXCSKTR(1)(2)
SC8863-XXXCSKTRT(1)(2)(3)
SC8863-XXXTSKTR(1)(2)
SC8863-XXXEVB(4)
SOT-23-5
SOT-23-5
TSOT-23-5
N/A
Notes:
(1) Where -XXX denotes voltage options. Available
voltages are: 2.50V (-250), 2.80V (-280), 3.00V (-300),
and 3.30 (-330)V.
SOT-23-5 & TSOT-23-5
(2) Only available in tape and reel packaging. A reel
contains 3000 devices.
(3) Lead free product. Fully WEEE and RoHS compliant.
(4) Evaluation board for SC8863. Specify output voltage
option and packaging when ordering.
Block Diagram
Pin Descriptions
Pin
1
Pin Name Pin Function
EN
GND
IN
Active high enable pin. Connect to VIN if not being used.
2
Ground pin. Can be used for heatsinking if needed.
3
Input pin.
4
OUT
SET
Regulator output, sourcing up to 150mA.
5
Connecting this pin to ground results in the internally preset value for VOUT. Connecting to an external
resistor divider changes VOUT to:
R1
R2
VOUT = 1.250 • 1+
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SC8863
POWER MANAGEMENT
Typical Characteristics
Output Voltage vs.
Output Current
Output Voltage vs. Junction Temperature
vs. Output Current
2.86
2.85
2.84
2.83
2.82
2.81
2.80
2.79
2.78
2.77
2.76
2.75
2.74
2.86
2.85
2.84
2.83
2.82
2.81
2.80
2.79
2.78
2.77
2.76
2.75
2.74
VIN = 3.6V
TJ = 25°C
VIN = 3.6V
IO = 1mA
IO = 50mA
IO = 100mA
IO = 150mA
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
IOUT (mA)
TJ (°C)
SET Reference Voltage vs.
Output Current
SET Reference Voltage vs. Junction
Temperature vs. Output Current
1.275
1.270
1.265
1.260
1.255
1.250
1.245
1.240
1.235
1.230
1.225
1.290
1.280
1.270
1.260
1.250
1.240
1.230
1.220
1.210
VIN = 3.6V
TJ = 25°C
VIN = 3.6V
IO = 1mA
IO = 50mA
IO = 100mA
IO = 150mA
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
IOUT (mA)
TJ (°C)
Dropout Voltage vs. Output Current
vs. Junction Temperature
Line Regulation vs.
Junction Temperature
250
225
200
175
150
125
100
75
12
SET = GND
VIN = 2.5V to 5.5V
SET = OUT
10
8
I
OUT = 1mA
-40°C
25°C
125°C
6
4
50
2
25
0
0
0
25
50
75
100
125
150
-50
-25
0
25
50
75
100
125
IOUT (mA)
TJ (°C)
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SC8863
POWER MANAGEMENT
Typical Characteristics (Cont.)
Load Regulation (VSET = GND)
vs. Junction Temperature
Load Regulation (VSET = VOUT
vs. Junction Temperature
)
50
20.0
17.5
15.0
12.5
10.0
7.5
VIN = 3.6V
SET = GND
VIN = 3.6V
SET = OUT
45
40
35
30
25
20
15
10
5
IOUT = 0mA to 150mA
IOUT = 0mA to 150mA
IOUT = 0mA to 100mA
IOUT = 0mA to 50mA
IOUT = 0mA to 100mA
5.0
2.5
IOUT = 0mA to 50mA
0.0
0
-50
-25
0
25
50
75
100
125
125
125
-50
-25
0
25
50
75
100
125
150
125
TJ (°C)
TJ (°C)
Supply Current vs.
Output Current
Supply Current vs.
Junction Temperature
120
110
100
90
80
70
60
50
40
30
20
10
0
150
125
100
75
VIN = 3.6V
OUT = 150mA
I
50
25
VIN = 3.6V
TJ = 25°C
0
0
25
50
75
100
125
-50
-25
0
25
50
75
100
I
OUT (mA)
TJ (°C)
Current Limit vs.
Junction Temperature
Enable Input Threshold vs.
Junction Temperature
350
300
250
200
150
100
50
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
VIN = 3.6V
VIN = 3.6V
VIH
VIL
0
-50
-25
0
25
50
75
100
-50
-25
0
25
50
75
100
T
J (°C)
TJ (°C)
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SC8863
POWER MANAGEMENT
Typical Characteristics (Cont.)
Sense/Select Threshold vs.
Junction Temperature
Output Spectral Noise Density
vs. Frequency
80
10
1
VIN = 3.6V
SC8863-2.8
VIN = 3.6V
IOUT = 50mA
TJ = 25°C
70
60
50
40
30
20
C
OUT = 1µF
0.1
0.01
COUT = 100µF
100
0.1
1
10
-50
-25
0
25
50
75
100
125
f (kHz)
TJ (°C)
Applications Information
Theory Of Operation
output noise and improve the overall transient response.
The SC8863 is intended for applications where very low Input capacitor: Semtech recommends the use of a 1µF
dropout voltage, low supply current and low output noise ceramic capacitor at the input. This allows for the device
are critical. It provides a very simple, low cost solution being some distance from any bulk capacitance on the
that uses very little pcb real estate. Fixed output voltage rail. Additionally, input droop due to load transients is
options require the use of only two external capacitors reduced, improving load transient response.
for operation.
Component Selection - Externally Set Output
Each voltage option has both fixed and adjustable
output voltage modes. Grounding the SET pin (pulling it Please refer to Figure 1 below. The output voltage can
below the Sense/Select threshold of 55mV) will connect be externally adjusted anywhere within the range from
the internal resistor divider to the error amplifier 1.25V to (VIN(MIN) - VD(MAX)). The output voltage will be in
resulting with the internally preset output voltage. If SET accordance with the following equation:
is pulled above this threshold, then the Sense/Select
switch will connect the SET pin to the error amplifier. The
output will be regulated such that the voltage at SET will
equal VSET, the SET reference voltage (typically 1.250V).
R1
R2
VOUT = 1.250 • 1+
An active high enable pin (EN) is provided to allow the
customer to shut down the part and enter an extremely
low power Off-state. A logic Low signal will reduce the
supply current to 0.1nA.
U1
IN
SC8863
OUT
3
1
4
5
R1
EN
SET
GND
2
Component Selection - General
R2
C1
10k
C2
1uF Ceramic
2.2uF Ceramic
Output capacitor: Semtech recommends a minimum
capacitance of 1µF at the output with an equivalent
series resistance (ESR) of <1Ω over temperature.
Ceramic capacitors are ideal for this application.
Increasing the bulk capacitance will further reduce
Figure 1: Externally set output
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SC8863
POWER MANAGEMENT
Applications Information (Cont.)
1% tolerance resistors are recommended. The values of With the standard SOT-23-5/TSOT-23-5 Land Pattern
R1 and R2 should be selected such that the current flow shown at the end of this datasheet, and minimum trace
through them is ≥ 10µA (thus R2 ≤ 120kΩ). At high input widths, the thermal impedance junction to ambient for
voltages and/or high output currents, stability may be SC8863 is 256°C/W. Thus with no additional heatsinking,
improved by increasing C2 to 2.2µF and reducing R2 to TJ(MAX) = 135°C.
10kΩ. See “Component Selection - General” for input
capacitor requirements.
The junction temperature can be reduced further by the
use of larger trace widths, and connecting pcb copper
area to the GND pin (pin 2), which connectes directly to
the device substrate. Adding approximately one square
Thermal Considerations
The worst-case power dissipation for this part is given inch of pcb copper to pin 2 will reduce θTH(J-A) to
by:
approximately 130°C/W and TJ(MAX) to approximately
110°C, for example. Lower junction temperatures
improve overall output voltage accuracy. A sample pcb
layout for the Internally Preset Output Voltage circuit on
page 1 is shown in Figure 2 on page 9.
PD(MAX)
=
VIN(MAX) − VOUT(MIN)
•IOUT(MAX) + V
•IQ(MAX)
IN(MAX)
For all practical purposes, it can be reduced to:
Layout Considerations
PD(MAX)
=
V
− VOUT(MIN) •IOUT(MAX)
IN(MAX)
While layout for linear devices is generally not as critical
as for a switching application, careful attention to detail
will ensure reliable operation. See Figure 2 on page 9 for
a sample layout.
Looking at a typical application:
VIN(MAX) = 4.2V
VOUT = (3 - 3.5%) = 2.895V worst-case
IOUT = 150mA
1) Attaching the part to a larger copper footprint will
enable better heat transfer from the device, especially
on PCBs where there are internal ground and power
planes.
TA = 85°C
This gives us:
2) Place the input and output capacitors close to the
device for optimal transient response and device
behavior.
PD(MAX)
=
4.2 − 2.895 • 0.150 = 196mW
( )
Using this figure, we can calculate the maximum thermal
impedance allowable to maintain TJ ≤ 150°C:
3) Connect all ground connections directly to the ground
plane. If there is no ground plane, connect to a common
local ground point before connecting to board ground.
TJ(MAX) − TA(MAX)
150 − 85
0.196
θ(J−A)(MAX)
=
=
= 332°C/ W
PD(MAX)
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SC8863
POWER MANAGEMENT
Applications Information (Cont.)
Top Copper
Top Silk Screen
Figure 2: Suggested pcb layout based upon internally preset output voltage application on page 1.
Notes:
(1) All vias go to the ground plane.
(2) Copper area on pin 2 is recommended, but not required. Connect to the ground plane with a via or vias.
Marking Information
Bottom Mark
Top Mark
SOT-23-5
yyww
8XXX
8 = 8863 in SOT-23-5
XXX = voltage option
yyww = Date code
(example: 0108 for week 8 of 2001)
(examples: 8280 = SC8863-280CSK)
Bottom Mark
Top Mark
TSOT-23-5
yyww
T8XX
T8 = 8863 in TSOT-23-5
XX = voltage option
yyww = Date code
(example: 0108 for week 8 of 2001)
(examples: T828 = SC8863-280TSK)
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SC8863
POWER MANAGEMENT
Outline Drawing - SOT-23-5
Outline Drawing - TSOT-23-5
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SC8863
POWER MANAGEMENT
Land Pattern - SOT-23-5 & TSOT-23-5
Contact Information
Semtech Corporation
Power Management Products Division
200 Flynn Road, Camarillo, CA 93012
Phone: (805)498-2111 FAX (805)498-3804
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