概述
数据手册MIC5270_05 概述
μCap Negative Low-Dropout Regulator μCap负低压差稳压器
MIC5270_05 数据手册
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PDF下载MIC5270
Micrel, Inc.
MIC5270
µCap Negative Low-Dropout Regulator
General Description
Features
The MIC5270 is a µCap 100mA negative regulator in a
SOT-23-5 package. With better than 2% initial accuracy, this
regulatorprovidesaveryaccuratesupplyvoltageforapplica-
tions that require a negative rail. The MIC5270 sinks 100mA
of output current at very low dropout voltage (600mV maxi-
mum at 100mA of output current).
• Stable with ceramic or tantalum capacitor
• Low dropout voltage: 500mV @ 100mA
• Low ground current: 35µA @ load = 100µA
• Tight initial accuracy: ±2%
• Tight load and line regulation
• Thermal shutdown
• Current limiting
The µCap regulator design is optimized to work with low-
value, low-cost ceramic capacitors. The output typically re-
quires only a 1µF capacitance for stability.
®
• IttyBitty SOT-23-5 packaging
Applications
Designed for applications where small packaging and effi-
ciencyarecritical,theMIC5270combinesLDOdesignexper-
• GaAsFET bias
®
tise with IttyBitty packaging to improve performance and
• Portable cameras and video recorders
• PDAs
reducepowerdissipation.Groundcurrentisoptimizedtohelp
improve battery life in portable applications.
• Battery-powered equipment
TheMIC5270isavailableintheSOT-23-5packageforspace
savingapplicationsanditisavailablewithfixed–3.0V, –4.1V,
–5.0V, and adjustable outputs.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Ordering Information
Part Number
Junction
Standard
Marking Code
LLAA
PbFree
Marking Code
LLAA
Voltage
Adj.
–3.0V
–4.1V
–5.0V
Temp. Range
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Package
SOT-23-5
SOT-23-5
SOT-23-5
SOT-23-5
MIC5270BM5
MIC5270YM5
MIC5270-3.0YM5
MIC5270-4.1YM5
MIC5270-5.0YM5
MIC5270-3.0BM5
MIC5270-4.1BM5
MIC5270-5.0BM5
LL30
LL30
LL41
LL41
LL50
LL50
Typical Application
MIC5270-5.0BM5
MIC5270BM5
R1
R2
2
2
5
3
GND
GND ADJ
VIN
VOUT
VIN
VOUT
4
5
4
–IN –OUT
–6.0V
–IN –OUT
–5.0V
–5.0V
–6.0V
1µF
10µF
1µF
10µF
Regulator With Fixed Output
Regulator With Adjustable Output
IttyBitty is a registered trademark of Micrel, Inc.
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
May 2005
1
M9999-052705
MIC5270
Micrel, Inc.
Pin Configuration
ADJ
GND NC
NC GND NC
3
2
1
3
2
1
LLAA
LLxx
4
–5IN
4
–OUT
–5IN
–OUT
MIC5270BM5
MIC5270-x.xBM5
Adjustable Voltage
Fixed Output Voltage
Pin Description
Pin Number
Pin Number
Pin Name
Pin Function
(Adj.)
(Fixed)
1
2
1
2
3
NC
GND
NC
Not internally connected.
Ground.
Not internally connected.
3
ADJ
Adjustable (Input): Adjustable feedback output connects to resistor voltage
divider.
4
5
4
5
–OUT
–IN
Negative Regulator Output.
Negative Supply Input.
M9999-052705
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May 2005
MIC5270
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Operating Ratings (Note 2)
Input Voltage (V ) ....................................... –20V to +0.3V
Input Voltage (V ) ....................................... –16V to –3.3V
IN
IN
Power Dissipation (P ) ............................ Internally Limited
Junction Temperature (T ) ....................... –40°C to +125°C
D
J
JA
Junction Temperature (T ) ....................... –40°C to +125°C
Thermal Resistance (θ ) ........................................ Note 4
J
Lead Temperature (soldering, 5 sec.) ....................... 260°C
Storage Temperature (T ) ....................... –65°C to +150°C
S
ESD Rating, Note 3
Electrical Characteristics (Note 5)
VIN = VOUT – 1.0V; COUT = 4.7µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C; unless noted.
Symbol
Parameter
Condition
Min
Typ
Max
Units
VOUT
Output Voltage Accuracy
Variation from nominal VOUT
–2
2
%
–3
3
%
∆VOUT/∆T
Output Voltage Temperature
Coefficient
Note 6
100
0.05
1.5
ppm/°C
∆VOUT/VOUT Line Regulation
∆VOUT/VOUT Load Regulation
VIN = VOUT – 1V to –16V
IOUT = 100µA to 100mA, Note 7
0.15
%/V
0.2
1.8
%
%
2.0
VIN – VOUT
Dropout Voltage, Note 8
IOUT = 100µA
IOUT = 50mA
IOUT = 100mA
40
360
500
mV
mV
mV
500
700
900
IGND
Ground Current, Note 9
IOUT = 100µA
IOUT = 50mA
IOUT = 100mA
f = 120Hz
VOUT = 0V
Note 10
35
0.7
2.1
50
160
0.05
100
µA
mA
mA
dB
mA
%/W
3.0
PSRR
ILIMIT
∆VOUT/∆PD
Ripple Rejection
Current Limit
Thermal Regulation
300
Note 1. Exceeding the absolute maximum rating may damage the device.
Note 2. The device is not guaranteed to function outside its operating rating.
Note 3. Devices are ESD sensitive. Handling precautions recommended.
Note 4. The maximum allowable power dissipation is a function of the maximum junction temperature, T
, the junction-to-ambient thermal
J(max)
resistance, θ , and the ambient temperature, T . The maximum allowable power dissipation at any ambient temperature is calculated using:
JA
A
P
= (T
–T ) ÷ θ , where θ is 235°C/W. Exceeding the maximum allowable power dissipation will result in excessive die
D(max)
J(max) A JA JA
temperature, and the regulator will go into thermal shutdown. See the “Thermal Considerations” section for details.
Note 5. Specification for packaged product only.
Note 6. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 7. Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested for load regulation in the load
range from 100µA to 100mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 8. Dropout voltage is defined as the input to output differential at which the output voltage drops 2% below its nominal value measured at 1V
differential.
Note 9. Ground pin current is the regulator quiescent current plus pass transistor base current. The total current drawn from the supply is the sum of
the load current plus the ground pin current.
Note 10. Thermal regulation is defined as the change in output voltage at a time “t” after a change in power dissipation is applied, excluding load or line
regulation effects. Specifications are for a 100mA load pulse at V = –16V for t = 10ms.
IN
May 2005
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M9999-052705
MIC5270
Micrel, Inc.
Typical Characteristics
Output Voltage
vs. Temperature
Output Voltage
Dropout
vs. Output Current
Characteristics
-3.305
-3.3
-3.4
-3.38
-3.36
-3.34
-3.32
-3.3
-3.5
-3
0 Load
-3.295
-3.29
-3.285
-3.28
-3.275
-3.27
-3.265
-3.26
-2.5
-2
-1.5
-1
-3.28
-3.26
-3.24
-3.22
-3.2
-0.5
0
-100mA Load
0
-20
-40
-60
-80 -100
-40 -20
0
20 40 60 80 100 120
0
-1
-2
-3
-4
-5
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
Ground Current
Characteristics
Ground Current
Characteristics
Ground Current
vs. Output Current
-2.5
-2
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
-2.5
-2
-1mA Load
-100µA Load
0µA Load
-100mA Load
-1.5
-1
-1.5
-1
-50mA Load
-10mA Load
-0.5
0
-0.5
0
5VIN
0
-1
-2
-3
-4
-5
0
-1
-2
-3
-4
-5
0
-20
-40
-60
-80 -100
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
OUTPUT CURRENT (mA)
Ground Current
vs. Temperature
Negative Enable Threshold
vs. Supply Voltage
Ground Current
vs. Temperature
-3.5
-3
-1.6
-1.4
-1.2
-1
-30
-25
-20
-15
-10
-5
Enable On
-1mA Load
-2.5
-2
-100mA Load
0A Load
Enable Off
-0.8
-0.6
-0.4
-0.2
0
-1.5
-1
-0.5
0
-50A Load
0
-40 -20
0
20 40 60 80 100 120
-4
-7
-10
-13
-16
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
Dropout
Dropout
Dropout
vs. Temperature
vs. Temperature
vs. Output Current
-700
-600
-500
-400
-300
-200
-100
0
-400
-350
-300
-250
-200
-150
-100
-50
-600
-100mA Load
-10mA Load
-500
-400
-300
-200
-100
0
-50mA Load
0A Load
0
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
0
-20
-40
-60
-80 -100
TEMPERATURE (°C)
TEMPERATURE (°C)
OUTPUT CURRENT (mA)
M9999-052705
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May 2005
MIC5270
Micrel, Inc.
Functional Characteristics
Load Transient
Load Transient
-10mA
-10mA
COUT = 1µF Ceramic
V
IN = 5V
V
OUT = 3V
-100mA
COUT = 1µF Ceramic
-100mA
V
IN = 5V
VOUT = 3V
TIME (2ms/div.)
TIME (2ms/div.)
May 2005
5
M9999-052705
MIC5270
Micrel, Inc.
Functional Diagram
GND
VIN
VOUT
MIC5270-x.x
M9999-052705
6
May 2005
MIC5270
Micrel, Inc.
minimum footprint board layout, is 235°C/W. The maximum
power dissipation at an ambient temperature of 25°C can be
determined with the following equation:
Applications Information
The MIC5270 is a general-purpose negative regulator that
can be used in any system that requires a clean negative
voltage from a negative output. This includes post regulating
of DC-DC converters (transformer based or charge pump
based voltage converters). These negative voltages typically
require a negative low-dropout voltage regulator to provide a
clean output from typically noisy lines.
T
− T
JA
J(max)
A
P
=
D(max)
θ
°
−
°
P
=
D(max)
235°C/W
Input Capacitor
PD(max) = 425mW
A 1µF input capacitor should be placed from IN to GND if
there is more than 2 inches of wire or trace between the input
and the AC filter capacitor, or if a battery is used as the input.
The actual power dissipation of the regulator circuit can be
determined using one simple equation.
Output Capacitor
P = VIN − VOUT
I
)
OUT
+ V ⋅IGND
(
D
IN
The MIC5270 requires an output capacitor for stable opera-
tion. Aminimumof1µFofoutputcapacitanceisrequired. The
output capacitor can be increased without limitation to im-
prove transient response. The output does not require ESR
to maintain stability, therefore a ceramic capacitor can be
used. High-ESRcapacitorsmaycauseinstability. Capacitors
with an ESR of 3Ω or greater at 100kHz may cause a high
frequency oscillation.
Substituting P
, determined above, for P and solving
D(max)
D
for the operating conditions that are critical to the application
will give the maximum operating conditions for the regulator
circuit. The maximum power dissipation number cannot be
exceeded for proper operation of the device. The maximum
input voltage can be determined using the output voltage of
5.0Vandanoutputcurrentof100mA.Groundcurrent,of1mA
for 100mA of output current, can be taken from the “Electrical
Characteristics ” section of the data sheet.
Low-ESR tantalums are recommended due to the tight ca-
pacitance tolerance over temperature.
Ceramic chip capacitors have a much greater dependence
on temperature, depending upon the dielectric. The X7R is
recommended for ceramic capacitors because the dielectric
will change capacitance value by approximately 15% over
temperature. The Z5U dielectric can change capacitance
value by as much 50% over temperature, and the Y5V
dielectric can change capacitance value by as much as 60%
over temperature. To use a ceramic chip capacitor with the
Y5V dielectric, the value must be much higher than a tanta-
lum to ensure the same minimum capacitor value over
temperature.
425mW = V − 5.0V 100mA + V ×1mA
(
)
IN
IN
425mW = 100mA × V +1mA × V − 500mW
IN
IN
925mW = 101mA × V
IN
V
= 9.16Vmax
IN
Therefore, a –5.0V application at 100mA of output current
canacceptamaximuminputvoltageof–9.16VinaSOT-23-5
package. For a full discussion of heat sinking and thermal
effects on voltage regulators, refer to Regulator Thermals
section of Micrel’s “Designing with Low-Dropout Voltage
Regulators ” handbook.
No-Load Stability
The MIC5270 does not require a load for stability.
Thermal Considerations
Adjustable Regulator Application
Absolutevalueswillbeusedforthermalcalculationstoclarify
what is meant by power dissipation and voltage drops across
the part.
MIC5270BM
–IN –OUT
GND ADJ
5
2
4
3
–V
IN
–VOUT
Proper thermal design for the MIC5270-5.0BM5 can be
accomplished with some basic design criteria and some
simple equations. The following information must be known
to implement your regulator design:
R2
R1
V
V
I
= input voltage
IN
Figure 1. Adjustable Voltage Application
The MIC5270BM5 can be adjusted from 1.20V to 14V by
using two external resistors (Figure 1). The resistors set the
output voltage based on the following equation:
= output voltage
OUT
OUT
= output current
T = ambient operating temperature
A
GND
I
= ground current
R2
Maximum power dissipation can be determined by knowing
V
= V
(1 +
)
OUT
REF
the ambient temperature, T , the maximum junction tem-
R1
A
perature, 125°C, and the thermal resistance, junction to
Where V
= 1.20V
REF
ambient. The thermal resistance for this part, assuming a
May 2005
7
M9999-052705
MIC5270
Micrel, Inc.
Package Information
1.90 (0.075) REF
0.95 (0.037) REF
1.75 (0.069) 3.00 (0.118)
1.50 (0.059) 2.60 (0.102)
DIMENSIONS:
MM (INCH)
1.30 (0.051)
0.90 (0.035)
3.02 (0.119)
2.80 (0.110)
0.20 (0.008)
0.09 (0.004)
10°
0°
0.15 (0.006)
0.00 (0.000)
0.50 (0.020)
0.35 (0.014)
0.60 (0.024)
0.10 (0.004)
SOT-23-5 (M5)
MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use.
Micrel reserves the right to change circuitry and specifications at any time without notification to the customer.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can
reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into
the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s
use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2003 Micrel, Incorporated.
M9999-052705
8
May 2005
MIC5270_05 相关器件
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| MIC5271 | MICROCHIP | The MIC5271 is a μCap 100mA negative regulator in a SOT-23-5 package. With better than 2% initial | 获取价格 |
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| MIC5271-3.0BM5 | MICREL | CAP NEGATIVE LOW-DROPOUT REGULATOR | 获取价格 |
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| MIC5271-3.0BM5TR | MICREL | 暂无描述 | 获取价格 |
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| MIC5271-3.0YM5 | MICROCHIP | 3V FIXED NEGATIVE LDO REGULATOR, 0.9V DROPOUT, PDSO5 | 获取价格 |
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| MIC5271-3.0YM5TR | MICROCHIP | 3V FIXED NEGATIVE LDO REGULATOR, 0.9V DROPOUT, PDSO5, SOT-23, 5 PIN | 获取价格 |
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| MIC5271-5.0BM5 | MICREL | CAP NEGATIVE LOW-DROPOUT REGULATOR | 获取价格 |
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| MIC5271-5.0BM5TR | MICREL | 暂无描述 | 获取价格 |
|
| MIC5271-5.0YM5 | ROCHESTER | 5V FIXED NEGATIVE LDO REGULATOR, 0.9V DROPOUT, PDSO5, SOT-23, 5 PIN | 获取价格 |
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