Micrel MIC5319-8YML 500ma ucap ultra-low dropout, high psrr ldo regulator Datasheet

MIC5319
Micrel
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.
Ideal for battery-operated applications, the MIC5319 features 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.
The MIC5319 is available in fixed-output voltages and adjustable output voltages in the super-compact 2mm x 2mm
MLF™ leadless package and thin SOT-23-5 package.
Additional voltage options are available. Contact Micrel
marketing.
All support documentation can be found on Micrel’s web
site at www.micrel.com.
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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
Tiny 2mm x 2mm MLF™ package, 500mA continuous
Thin SOT-23-5 package, 500mA peak
Applications
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Cellular phones
PDAs
Fiber optic modules
Portable electronics
Notebook PCs
Audio Codec power supplies
MIC5319
VIN
2.8V@500mA
VOUT
VIN VOUT
1µF
EN
BYP
0.1µF
DROPOUT VOLTAGE (mV)
Typical Application
Dropout Voltage
200
180
160
140
120
100
80
60
40
20
Vout = 2.8V
Cout = 2.2uF
0
2.2µF
0
GND
100
200
300
400
500
OUTPUT CURRENT (mA)
100
PSRR
(Bypass Pin Cap = 0.1µF)
PSRR (dB)
90
80
70
50mA
100µA
60
50
40
30
20
10
0
10
500mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
1k
100
10k 100k
FREQUENCY (Hz)
1M
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
October 2004
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MIC5319
Micrel
Ordering Information
Marking
Voltage
Junction Temp. Range(1)
MIC5319-2.8BD5
N928
2.8
–40°C to +125°C
Thin SOT23-5
MIC5319-2.8BML
928
2.8
–40°C to +125°C
6-pin 2x2 MLF™
MIC5319BML
9AA
ADJ
–40°C to +125°C
6-pin 2x2 MLF™
MIC5319-2.8YD5
N928
2.8
–40°C to +125°C
Thin SOT23-5 Pb-Free
Part Number
Package
MIC5319-2.8YML
928
2.8
–40°C to +125°C
6-pin 2x2 MLF™ Pb-Free
MIC5319YML
9AA
ADJ
–40°C to +125°C
6-pin 2x2 MLF™ Pb-Free
Note:
1. For other output voltage options, contact Micrel marketing.
Pin Configuration
EN 1
GND 2
VIN 3
6 BYP
5 NC
4 VOUT
EN 1
6 BYP
GND 2
5 ADJ
VIN 3
4 VOUT
MIC5319BML (Adjustable)
6-Pin 2mm x 2mm MLF™ (ML)
(Top View)
MIC5319-x.xBML
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.
1
1
3
EN
2
2
2
GND
Ground.
3
3
1
VIN
Supply Input.
4
4
5
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
October 2004
Pin Number
Pin Name
TSOT-23-5 Fixed
Pin Function
Enable Input. Active High. High = on, low = off. Do not
leave floating.
Output voltage.
Exposed Heatsink Pad connected to ground internally.
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MIC5319
Micrel
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN) .................................... 0V to 6V
Enable Input Voltage (VEN) ................................... 0V to 6V
Power Dissipation (PD) ........................ Internally Limited(3)
Junction Temperature(TJ) ........................ –40°C to +125°C
Storage Temperature (TS) ......................... –65°C to 150°C
Lead Temperature (soldering, 5 sec.) ....................... 260°C
ESD(4) .............................................................................................. 3kV
Supply Input Voltage (VIN) .............................. 2.5V to 5.5V
Enable Input Voltage (VEN) .................................. 0V to VIN
Junction Temperature (TJ) ....................... –40°C to +125°C
Package Thermal Resistance
MLF™ (θJA) ......................................................... 93°C/W
TSOT-23 (θJA) ................................................... 235°C/W
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
Output Voltage Accuracy
Variation from nominal VOUT
Variation from nominal VOUT, IOUT = 100µA to 500mA
Typ
Max
Units
–1.0
+1.0
%
–2.0
+2.0
%
Feedback Voltage
1.2375
1.25
1.2625
V
(ADJ option)
1.225
1.25
1.275
V
VIN = VOUT +1V to 5.5V
0.04
0.3
%/V
IOUT = 100µA to 500mA
0.1
0.5
%
IOUT = 50mA
20
40
mV
IOUT = 500mA
200
400
mV
IOUT = 0 to 500mA
90
150
µA
Ground Pin Current in Shutdown
VEN ≤ 0.2V
0.5
µA
Ripple Rejection
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF
70
dB
f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1µF
60
dB
700
mA
µVrms
Line Regulation
Load
Regulation(6)
Dropout
Voltage(7)(8)
Ground Pin
Current(9)
Current Limit
VOUT = 0V
600
Output Voltage Noise
COUT =2.2µF, CBYP = 0.1µF, 10Hz to 100kHz
40
Turn-On Time
COUT = 2.2µF; CBYP = 0.01µF
40
100
µs
0.2
V
Enable Input
Enable Input Voltage
Logic Low (Regulator Shutdown)
Logic High (Regulator Enabled)
Enable Input Current
1.0
V
VIL ≤ 0.2V (Regulator Shutdown)
0.01
1
µA
VIH ≥ 1.0V (Regulator Enabled)
0.01
1
µA
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 TA (ambient temperature) is PD(max) = (TJ(max) - TA) / θJA. Exceeding the maximum allowable
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 VOUT. For outputs below 2.5V,
dropout voltage spec does not apply, as part is limited by minimum VIN spec of 2.5V. There may be some typical dropout degradation at VOUT <3V.
8. For ADJ option, VOUT = 3V for dropout specification.
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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Micrel
Typical Characteristics
40
30
20
10
0
10
1k
100
10k 100k
FREQUENCY (Hz)
0
10
1M
Ground Current
90
60
50
40
30
Iload = 50mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
30
20
10
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
90
GROUND CURRENT (µA)
Iload = 500mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
Ground Current
70
60
50
40
30
10
0
3
October 2004
Iload = 500mA
Vout = 2.8V
Cout = 2.2uF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
Ground Current
50
40
30
Iload = 150mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
20
10
70
60
50
40
Iload = 50mA
Vout = 2.8V
Cout = 2.2 uF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
Dropout Characteristics
2.5
2
150mA
1.5
1 50mA
500mA
0.5
0
0
1
2
3
4
INPUT VOLTAGE (V)
4
65
60
5
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
Cbyp = 0.01uF
1
10
100
1000
OUTPUT CURRENT (mA)
Ground Current
80
70
60
50
40
30
20
10
100
90
80
10
0
3
70
Iload = 300mA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2 uF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
Ground Current
30
20
75
90
60
Ground Current
80
55
0.1
1M
70
3
80
20
GROUND CURRENT (µA)
50
40
OUTPUT VOLTAGE (V)
GROUND CURRENT (µA)
70
60
1k
100
10k 100k
FREQUENCY (Hz)
80
100
90
80
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
Ground Current
100
50mA
20
10
70
10
500mA
40
30
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
80
20
60
50
GROUND CURRENT (µA)
GROUND CURRENT (µA)
90
500mA
100µA
GROUND CURRENT (µA)
60
50
GROUND CURRENT (µA)
100µA
85
Ground Current
90
80
70
60
50
40
30
20
10
0
3
30
DROPOUT VOLTAGE (mV)
50mA
90
80
70
PSRR (dB)
PSRR (dB)
90
80
70
PSRR
(Bypass Pin Cap = 0.01µF)
100
GROUND CURRENT (µA)
PSRR
(Bypass Pin Cap = 0.1µF)
100
Iload = 150mA
Vout = 2.8V
Cout = 2.2 uF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
Dropout Voltage
25
20
15
10
5
Iload = 50mA
Vout = 2.8V
Cout = 2.2uF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
M9999-100604
MIC5319
Micrel
DROPOUT VOLTAGE (mV)
70
60
50
40
30
20
Iload = 150mA
Vout = 2.8V
Cout = 2.2uF
10
600
500
400
300
100
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
150
100
50
3
OUTPUT VOLTAGE (V)
SHORT CIRCUIT CURRENT (mA)
Short Circuit Current
200
200
6
Iload = 500mA
Vout = 2.8V
Cout = 2.2uF
Output Voltage vs.
Temperature
2.95
2.9
2.85
2.8
2.75
2.7
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
2.65
2.6
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
Dropout Voltage
200
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
700
Dropout Voltage
180
160
140
120
100
80
60
40
20
Vout = 2.8V
Cout = 2.2uF
0
0
100
200
300
400
500
OUTPUT CURRENT (mA)
ENABLE THRESHOLD VOLTAGE (V)
DROPOUT VOLTAGE (mV)
250
DROPOUT VOLTAGE (mV)
Dropout Voltage
80
1.6
Enable Threshold vs.
Temperature
1.4
1.2
1
0.8
0.6
0.4
0.2
Iload = 100uA
Vout = 2.8V
Vin = Vout + 1V
Cout = 2.2uF
0
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (C)
Output Noise Spectral Density
NOISE (µV/ √ Hz)
10
1
0.1
Iload = 50Ω
Vout = 2.8V
0.01 Vin = 4.45V
Cout = 2.2uF
Cbyp = 0.01uF
0.001
10 100 1k 10k 100k 1M 10M
FREQUENCY (Hz)
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Micrel
Functional Characteristics
Line Transient Response
Output Voltage
(10mV/div)
Load Transient Response
Input Voltage
(2V/div)
5V
4V
CBYP = 0.01µF
VIN = 3.8V
COUT = 2.2µF
Output Current
(200mA/div)
Output Voltage
(100mV/div)
500mA
CBYP = 0.01µF
IOUT = 100µA
COUT = 2.2µF
100mA
TIME (4µs/div)
TIME (200µs/div)
Shutdown Delay
VOUT = 3V
CBYP = 0.01µF
IOUT = 100µA
COUT = 2.2µF
TIME (20µs/div)
October 2004
CBYP = 0.01µF
RL = 6Ω
COUT = 2.2µF
VIN = 3.8V
Output Voltage
(1V/div)
Output Voltage
(1V/div)
Enable Voltage
(1V/div)
Enable Voltage
(1V/div)
Enable Pin Delay
TIME (20µs/div)
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MIC5319
Micrel
Functional Diagram
VIN
VOUT
EN
VREF
QuickStart
Error
Amp
BYP
Thermal
Shutdown
Current
Limit
MIC5319
GND
MIC5319 Block Diagram - Fixed
VOUT
VIN
EN
VREF
QuickStart
Error
Amp
BYP
ADJ
Thermal
Shutdown
Current
Limit
MIC5319
GND
MIC5319 Block Diagram - Adjustable
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MIC5319
Micrel
No-Load Stability
Unlike many other voltage regulators, the MIC5319 will
remain stable and in regulation with no load. This is especially
important in CMOS RAM keep-alive applications.
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:
Applications Information
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-modecurrent 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.
Input Capacitor
The MIC5319 is a high-performance, high bandwidth device.
Therefore, it requires a well-bypassed input supply for optimal performance. A 1µF capacitor is required from the inputto-ground to provide stability. Low-ESR ceramic capacitors
provide optimal performance at a minimum of space. Additional high frequency capacitors, such as small-valued NPO
dielectric-type capacitors, help filter out high-frequency noise
and are good design practice in any RF-based circuit.
Output Capacitor
The MIC5319 requires an output capacitor of 2.2µF or greater
to maintain stability. The design is optimized for use with lowESR ceramic chip capacitors. High ESR capacitors may
cause high frequency oscillation. The output capacitor can be
increased, but performance has been optimized for a 2.2µF
ceramic output capacitor and does not improve significantly
with larger capacitance.
X7R/X5R dielectric-type ceramic capacitors are recommended because of their temperature performance. X7Rtype capacitors change capacitance by 15% over their operating temperature range and are the most stable type of
ceramic capacitors. Z5U and Y5V dielectric capacitors change
value by as much as 50% and 60%, respectively, over their
operating temperature ranges. To use a ceramic chip capacitor with Y5V dielectric, the value must be much higher than an
X7R ceramic capacitor to ensure the same minimum capacitance over the equivalent operating temperature range.
Bypass Capacitor
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 capacitor can be increased, further reducing noise and improving 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 Characteristics” section for performance with different bypass
capacitors.
October 2004
⎛ R1⎞
VOUT = VREF ⎜1 +
⎟
⎝ R2 ⎠
VREF = 1.25V
VIN
MIC5319BML
VOUT
VIN VOUT
1µF
EN
R1
BYP ADJ
GND
R2
2.2µF
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
operating temperature can be calculated based on the output
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:
PD = (VIN – VOUT) IOUT + VIN × IGND
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.
PD = (3.3V – 2.8V) × 500mA
PD = 0.25W
To determine the maximum ambient operating temperature
of the package, use the junction-to-ambient thermal resistance of the device and the following basic equation:
⎛ T (max) – TA ⎞
PD (max) = ⎜ J
⎟
θ JA
⎝
⎠
TJ(max) = 125°C, the maximum junction temperature of the die
θJA thermal resistance = 93°C/W
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Table 1 shows junction-to-ambient thermal resistance for the
MIC5319 in the 2mm x 2mm MLF package.
Package
θJA Recommended
Minimum Footprint
θJC
2 x 2 MLF™
93°C/W
2°C/W
SOT-23-5
235°C/W
0.25W =
TA = 101.75°C
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 information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
Table 1. Thermal Resistance
Substituting 0.25W for PD(max) and solving for the ambient
operating temperature will give the maximum operating conditions for the regulator circuit. The maximum power dissipation must not be exceeded for proper operation.
October 2004
125°C − TA
93°C/W
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Micrel
Package Information
TOP VIEW
BOTTOM VIEW
DIMENSIONS IN
MILLIMETERS
SIDE VIEW
Rev. 02
6-Pin MLF™ (ML)
4AL TSOT-23-5 (D5)
MICREL, INC.
TEL
2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
+ 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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M9999-100604
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