MIC5319-8YD5 [MICREL]
500mA ?Cap Ultra-Low Dropout, High PSRR LDO Regulator; 500毫安？帽超低压差，高PSRR LDO稳压器
| 型号： | MIC5319-8YD5 |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | 500mA ?Cap Ultra-Low Dropout, High PSRR LDO Regulator |
| 文件： | 总10页 (文件大小：320K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC5319
500mA µCap Ultra-Low Dropout, High PSRR LDO Regulator
General Description
Features
The MIC5319 is a high-performance, 500mA LDO regulator,
offering extremely high PSRR and very low noise while
consuming low ground current.
• Ultra-low dropout voltage 200mV @ 500mA
• Input voltage range: 2.5 to 5.5V
• Stable with ceramic output capacitor
• Low output noise — 40µVrms
• Low quiescent current of 90µA total
• High PSRR, up to 70dB @1kHz
• Fast turn-on-time — 40µs typical
• High output accuracy:
• ±1.0% initial accuracy
• ±2.0% over temperature
• Thermal shutdown protection
• Current-limit protection
• Logic-controlled Enable
Ideal for battery-operated applications, the MIC5319 fea-
tures 1% accuracy, extremely low-dropout voltage (200mV
@ 500mA), and low ground current at light load (typically
90µA). Equipped with a logic-compatible enable pin, the
MIC5319 can be put into a zero-off-mode current state,
drawing no current when disabled.
The MIC5319 is a µCap design operating with very small
ceramic output capacitors for stability, thereby reducing
required board space and component cost.
TheMIC5319isavailableinfixed-outputvoltagesandadjust-
able output voltages in the super-compact 2mm x 2mm
MLF™ leadless package and thin SOT-23-5 package.
• Tiny 2mm x 2mm MLF™ package, 500mA continuous
• Thin SOT-23-5 package, 500mA peak
Applications
• Cellular phones
• PDAs
• Fiber optic modules
• Portable electronics
• Notebook PCs
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
• Audio Codec power supplies
Typical Application
Dropout Voltage
200
180
160
140
120
100
80
MIC5319
60
2.8V@500mA
VOUT
VIN
40
VIN VOUT
Vout = 2.8V
20
Cout = 2.2uF
0
1µF
EN
BYP
GND
0.1µF
2.2µF
0
100 200 300 400 500
OUTPUT CURRENT (mA)
PSRR
(Bypass Pin Cap = 0.1µF)
100
90
80
70
60
50
40
30
20
10
0
50mA
100µA
500mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
MicroLeadFrame and MLF are trademarks of Amkor Technology, 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
M9999-100604
October 2004
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MIC5319
Micrel
Ordering Information
Part Number
Marking Voltage Junction Temp. Range(1)
Package
MIC5319-2.8BD5
MIC5319-2.8BML
MIC5319BML
N928
928
2.8
2.8
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
Thin SOT23-5
6-pin 2x2 MLF™
9AA
N928
928
ADJ
2.8
6-pin 2x2 MLF™
MIC5319-2.8YD5
MIC5319-2.8YML
MIC5319YML
Thin SOT23-5 Pb-Free
6-pin 2x2 MLF™ Pb-Free
6-pin 2x2 MLF™ Pb-Free
2.8
9AA
ADJ
Note:
1. For other output voltage options, contact Micrel marketing.
Pin Configuration
6
5
4
BYP
NC
6
5
4
BYP
EN
GND
VIN
1
2
3
EN
GND
VIN
1
2
3
ADJ
VOUT
VOUT
MIC5319-x.xBML
6-Pin 2mm x 2mm MLF™ (ML)
(Top View)
MIC5319BML (Adjustable)
6-Pin 2mm x 2mm MLF™ (ML)
(Top View)
EN GND VIN
3
2
1
KWxx
4
5
BYP
VOUT
MIC5319-x.xBD5
TSOT-23-5 (D5)
(Top View)
Pin Description
Pin Number
MLF-6 Fixed
Pin Number
MLF-6 Adj.
Pin Number
TSOT-23-5 Fixed
Pin Name Pin Function
1
1
3
EN
Enable Input. Active High. High = on, low = off. Do not
leave floating.
2
3
4
2
3
4
2
1
5
–
GND
VIN
Ground.
Supply Input.
Output voltage.
VOUT
–
5
5
–
ADJ
NC
Adjust Input: Connect to external resistor voltage divider network.
No connection for fixed voltage parts.
6
6
4
–
BYP
Reference Bypass: Connect external 0.1µF to GND for reduced
output noise. May be left open.
HS Pad
HS Pad
EPAD
Exposed Heatsink Pad connected to ground internally.
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Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (V ) .................................... 0V to 6V
Supply Input Voltage (V ) .............................. 2.5V to 5.5V
IN
IN
Enable Input Voltage (V ) ................................... 0V to 6V
Enable Input Voltage (V ) .................................. 0V to V
IN
EN
EN
(3)
Power Dissipation (P ) ........................ Internally Limited
Junction Temperature (T ) ....................... –40°C to +125°C
D
J
Junction Temperature(T ) ........................ –40°C to +125°C
Package Thermal Resistance
J
Storage Temperature (T ) ......................... –65°C to 150°C
MLF™ (θ ) .........................................................93°C/W
S
JA
TSOT-23 (θ ) ...................................................235°C/W
Lead Temperature (soldering, 5 sec.) ....................... 260°C
JA
(4)
ESD .............................................................................................. 3kV
Electrical Characteristics(5)
VIN = VOUT +1.0V; COUT = 2.2µF, IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to + 125°C; unless noted.
Parameter
Condition
Min
–1.0
–2.0
Typ
Max
+1.0
+2.0
Units
%
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT, IOUT = 100µA to 500mA
%
Feedback Voltage
(ADJ option)
1.2375 1.25 1.2625
V
1.225
1.25
0.04
0.1
20
1.275
0.3
V
Line Regulation
Load Regulation(6)
Dropout Voltage(7)(8)
VIN = VOUT +1V to 5.5V
IOUT = 100µA to 500mA
IOUT = 50mA
%/V
%
0.5
40
mV
mV
µA
IOUT = 500mA
200
90
400
150
Ground Pin Current(9)
Ground Pin Current in Shutdown
Ripple Rejection
IOUT = 0 to 500mA
VEN 0.2V
0.5
70
µA
≤
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF
f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF
VOUT = 0V
dB
60
dB
Current Limit
600
700
40
mA
µVrms
µs
Output Voltage Noise
Turn-On Time
COUT =2.2µF, CBYP = 0.1µF, 10Hz to 100kHz
COUT = 2.2µF; CBYP = 0.01µF
40
100
0.2
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
V
V
1.0
Enable Input Current
VIL
≤
0.2V (Regulator Shutdown)
0.01
0.01
1
1
µA
µA
VIH 1.0V (Regulator Enabled)
≥
Notes:
1. Exceeding maximum ratings may damage the device.
2. The device is not guaranteed to work outside its operating rating.
3. The maximum allowable power dissipation of any T (ambient temperature) is P (max) = (T (max) - T ) / θ . Exceeding the maximum allowable
A
D
J
A
JA
power dissipation will result in excessive die temperature, and the regulator may go into thermal shutdown.
4. Devices are ESD sensitive. Handling precautions recommended. Human Body Model.
5. Specification for packaged product only.
6. Regulation is measured at constant junction temperature using low duty cycle pulse testing.
7. Dropout voltage is defined as the input-to-output differential at which the output voltage drops 2% below its nominal V
. For outputs below 2.5V,
OUT
dropout voltage spec does not apply, as part is limited by minimum V spec of 2.5V. There may be some typical dropout degradation at V
<3V.
IN
OUT
8. For ADJ option, V
= 3V for dropout specification.
OUT
9. Ground pin current is the regulator quiescent current. The total current drawn from the supply is the sum of the load current plus the ground pin
current.
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Typical Characteristics
PSRR
PSRR
(Bypass Pin Cap = 0.1µF)
(Bypass Pin Cap = 0.01µF)
Ground Current
100
100
90
80
70
60
50
40
30
20
10
0
85
80
75
70
65
60
55
90
50mA
100µA
100µA
80
70
60
50
40
30
20
10
0
500mA
500mA
50mA
Vout = 2.8V
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Vin = Vout + 1V
Cout = 2.2uF
Cbyp = 0.01uF
0.1
1
10
100
1000
10
10
100
1k
10k 100k 1M
FREQUENCY (Hz)
100
1k
10k 100k 1M
FREQUENCY (Hz)
OUTPUT CURRENT (mA)
Ground Current
Ground Current
Ground Current
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
Iload = 50mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
Iload = 150mA
Iload = 300mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (C)
TEMPERATURE (C)
TEMPERATURE (C)
Ground Current
Ground Current
Ground Current
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
Iload = 500mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
Iload = 150mA
Iload = 50mA
Vout = 2.8V
Vout = 2.8V
Cout = 2.2 uF
Cout = 2.2 uF
-40 -20
0
20 40 60 80 100 120
3
3.5
4
4.5
5
5.5
3
3.5
4
4.5
5
5.5
TEMPERATURE (C)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
Ground Current
Dropout Characteristics
Dropout Voltage
90
80
70
60
50
40
30
20
10
0
3
2.5
2
30
25
20
15
10
5
150mA
1.5
1
500mA
50mA
Iload = 500mA
Iload = 50mA
Vout = 2.8V
Cout = 2.2uF
0.5
0
Vout = 2.8V
Cout = 2.2uF
0
3
3.5
4
4.5
5
5.5
0
1
2
3
4
5
-40 -20
0
20 40 60 80 100 120
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
TEMPERATURE (C)
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MIC5319
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Dropout Voltage
Dropout Voltage
Dropout Voltage
250
200
150
100
50
80
200
180
160
140
120
100
80
70
60
50
40
30
20
10
0
60
40
Iload = 500mA
Iload = 150mA
Vout = 2.8V
Vout = 2.8V
Cout = 2.2uF
Vout = 2.8V
20
Cout = 2.2uF
Cout = 2.2uF
0
0
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
0
100 200 300 400 500
OUTPUT CURRENT (mA)
TEMPERATURE (C)
TEMPERATURE (C)
Enable Threshold vs.
Temperature
Output Voltage vs.
Temperature
Short Circuit Current
1.6
1.4
1.2
1
3
2.95
2.9
700
600
500
400
300
200
100
2.85
2.8
0.8
0.6
0.4
0.2
0
2.75
2.7
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
2.65
2.6
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
3
3.5
4
4.5
5
5.5
6
TEMPERATURE (C)
TEMPERATURE (C)
INPUT VOLTAGE (V)
Output Noise Spectral Density
10
1
0.1
Iload = 50Ω
Vout= 2.8V
Vin = 4.45V
Cout= 2.2uF
Cbyp = 0.01uF
0.01
0.001
10 100 1k 10k
1M 10M
100k
FREQUENCY (Hz)
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Functional Characteristics
Line Transient Response
Load Transient Response
5V
4V
CBYP = 0.01µF
VIN = 3.8V
COUT = 2.2µF
500mA
CBYP = 0.01µF
100mA
I
OUT = 100µA
C
OUT = 2.2µF
TIME (4µs/div)
TIME (200µs/div)
Shutdown Delay
Enable Pin Delay
CBYP = 0.01µF
RL = 6Ω
COUT = 2.2µF
VIN = 3.8V
VOUT = 3V
CBYP = 0.01µF
IOUT = 100µA
COUT = 2.2µF
TIME (20µs/div)
TIME (20µs/div)
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Functional Diagram
VIN
EN
VOUT
Quick-
Start
VREF
Error
Amp
BYP
Thermal
Shutdown
Current
Limit
MIC5319
GND
MIC5319 Block Diagram - Fixed
VOUT
VIN
EN
Quick-
Start
VREF
Error
Amp
BYP
ADJ
Thermal
Shutdown
Current
Limit
MIC5319
GND
MIC5319 Block Diagram - Adjustable
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No-Load Stability
Applications Information
Unlike many other voltage regulators, the MIC5319 will
remainstableandinregulationwithnoload.Thisisespecially
important in CMOS RAM keep-alive applications.
Enable/Shutdown
The MIC5319 features an active-high enable pin that allows
the regulator to be disabled. Forcing the enable pin low
disables the regulator and sends it into a “zero” off-mode-
current state. In this state, current consumed by the regulator
goes nearly to zero. Forcing the enable pin high enables the
output voltage. The active-high enable pin uses CMOS
technology and the enable pin cannot be left floating, as this
may cause an indeterminate state on the output.
Adjustable Regulator Application
Adjustable regulators use the ratio of two resistors to multiply
the reference voltage to produce the desired output voltage.
The MIC5319 can be adjusted from 1.25V to 5.5V by using
two external resistors (Figure 1). The resistors set the output
voltage based on the following equation:
Input Capacitor
R1
R2
⎛
⎜
⎝
⎞
⎟
⎠
V
= V
1+
OUT
REF
The MIC5319 is a high-performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for opti-
mal performance. A 1µF capacitor is required from the input-
to-ground to provide stability. Low-ESR ceramic capacitors
provide optimal performance at a minimum of space. Addi-
tional high frequency capacitors, such as small-valued NPO
dielectric-typecapacitors, helpfilterouthigh-frequencynoise
and are good design practice in any RF-based circuit.
V
= 1.25V
REF
MIC5319BML
VOUT
VIN
VIN VOUT
EN
R1
R2
1µF
2.2µF
BYP ADJ
GND
Output Capacitor
TheMIC5319requiresanoutputcapacitorof2.2µForgreater
to maintain stability. The design is optimized for use with low-
ESR ceramic chip capacitors. High ESR capacitors may
causehighfrequencyoscillation.Theoutputcapacitorcanbe
increased, but performance has been optimized for a 2.2µF
ceramic output capacitor and does not improve significantly
with larger capacitance.
Figure 1. Adjustable Voltage Application
Thermal Considerations
The MIC5319 is designed to provide 500mA of continuous
current in a very small MLF package. Maximum ambient
operatingtemperaturecanbecalculatedbasedontheoutput
current and the voltage drop across the part. Given an input
voltage of 3.3V, output voltage of 2.8V and output current =
500mA, the actual power dissipation of the regulator circuit
can be determined using the equation:
X7R/X5R dielectric-type ceramic capacitors are recom-
mended because of their temperature performance. X7R-
type capacitors change capacitance by 15% over their oper-
ating temperature range and are the most stable type of
ceramiccapacitors.Z5UandY5Vdielectriccapacitorschange
value by as much as 50% and 60%, respectively, over their
operatingtemperatureranges. Touseaceramicchipcapaci-
torwithY5Vdielectric, thevaluemustbemuchhigherthanan
X7R ceramic capacitor to ensure the same minimum capaci-
tance over the equivalent operating temperature range.
P = (V – V
) I
+ V × I
D
IN
OUT OUT IN GND
Because this device is CMOS and the ground current is
typically <100µA over the load range, the power dissipation
contributed by the ground current is < 1% and can be ignored
for this calculation.
Bypass Capacitor
P = (3.3V – 2.8V) × 500mA
D
A capacitor can be placed from the bypass pin-to-ground to
reduce output voltage noise. The capacitor bypasses the
internal reference. A 0.1µF capacitor is recommended for
applications that require low-noise outputs. The bypass ca-
pacitor can be increased, further reducing noise and improv-
ing PSRR. Turn-on time increases slightly with respect to
bypass capacitance. A unique, quick-start circuit allows the
MIC5319 to drive a large capacitor on the bypass pin without
significantly slowing turn-on time. Refer to the “Typical Char-
acteristics” section for performance with different bypass
capacitors.
P = 0.25W
D
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resis-
tance of the device and the following basic equation:
⎛
⎞
TJ(max)– TA
PD(max) =
⎜
⎟
θJA
⎝
⎠
T (max) = 125°C, the maximum junction temperature of the die
J
θ
thermal resistance = 93°C/W
JA
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Table 1 shows junction-to-ambient thermal resistance for the
MIC5319 in the 2mm x 2mm MLF package.
125°C − T
93°C/W
A
0.25W =
Package
θJA Recommended
Minimum Footprint
θJC
T = 101.75°C
A
2 x 2 MLF™
SOT-23-5
93°C/W
235°C/W
2°C/W
Therefore, a 2.8V application at 500mA of output current can
accept an ambient operating temperature of 101.75°C in a
2mm x 2mm MLF package. For a full discussion of heat
sinking and thermal effects on voltage regulators, refer to the
“Regulator Thermals” section of Micrel’s Designing with
Low-Dropout Voltage Regulators handbook. This informa-
tion can be found on Micrel's website at:
Table 1. Thermal Resistance
Substituting 0.25W for P (max) and solving for the ambient
D
operating temperature will give the maximum operating con-
ditions for the regulator circuit. The maximum power dissipa-
tion must not be exceeded for proper operation.
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
October 2004
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MIC5319
Micrel
Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
Rev. 02
SIDE VIEW
6-Pin MLF™ (ML)
TSOT-23-5 (D5)
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
The 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 at Purchaser’s own risk and Purchaser agrees to fully indemnify
Micrel for any damages resulting from such use or sale.
© 2004 Micrel, Incorporated.
October 2004
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