Micrel MIC5319-1.8YD5 500ma î¼cap ultra-low dropout high psrr ldo regulator Datasheet

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.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
•
•
•
•
•
•
•
•
•
•
•
•
•
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
•
•
•
•
•
•
Cellular phones
PDAs
Fiber optic modules
Portable electronics
Notebook PCs
Audio Codec power supplies
Typical Application
MLF and MicroLeadFrame are registered 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
May 2010
M9999-052510
Micrel, Inc.
MIC5319
Ordering Information
Pb-Free(1)
(V)
Junction
Temperature
Range
13H
1.375
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
918
1.8
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
91J
1.85
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
925
2.5
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-2.6YML
926
2.6
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-2.7YML
927
2.7
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
928
2.8
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-2.9YML
929
2.9
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-3.0YML
930
3.0
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
Part Number
Standard
Pb-Free
Marking
Standard
MIC5319-1.3HYML
MIC5319-1.8BML
MIC5319-1.8YML
918
MIC5319-1.85YML
MIC5319-2.5BML
MIC5319-2.8BML
MIC5319-2.5YML
925
MIC5319-2.8YML
928
Voltage(2)
Package
MIC5319-3.3BML
MIC5319-3.3YML
933
933
3.3
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-5.0BML
MIC5319-5.0YML
950
950
5.0
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319BML
MIC5319YML
9AA
9AA
ADJ
−40°C to +125°C
6-Pin 2mm × 2mm MLF®
MIC5319-1.3HYD5
N13H
1.375
−40°C to +125°C
Thin SOT-23-5
MIC5319-1.8YD5
N918
1.8
−40°C to +125°C
Thin SOT-23-5
MIC5319-1.85YD5
N91J
1.85
−40°C to +125°C
Thin SOT-23-5
MIC5319-2.5YD5
N925
2.5
−40°C to +125°C
Thin SOT-23-5
MIC5319-2.6YD5
N926
2.6
−40°C to +125°C
Thin SOT-23-5
MIC5319-2.7YD5
N927
2.7
−40°C to +125°C
Thin SOT-23-5
N928
2.8
−40°C to +125°C
Thin SOT-23-5
MIC5319-2.9YD5
N929
2.9
−40°C to +125°C
Thin SOT-23-5
MIC5319-3.0YD5
N930
3.0
−40°C to +125°C
Thin SOT-23-5
N933
3.3
−40°C to +125°C
Thin SOT-23-5
N950
5.0
−40°C to +125°C
Thin SOT-23-5
MIC5319-2.8BD5
MIC5319-3.3BD5
MIC5319-2.8YD5
MIC5319-3.3YD5
N928
N933
MIC5319-5.0YD5
Notes:
1.
Under-bar/Over-bar symbols may not be to scale.
2.
For other output voltage options, contact Micrel Marketing.
May 2010
2
M9999-052510
Micrel, Inc.
MIC5319
Pin Configuration
MIC5319-x.xBML/YML
6-Pin 2mm × 2mm MLF® (ML)
Top View
MIC5319BML/YML (Adjustable)
6-Pin 2mm × 2mm MLF® (ML)
Top View
MIC5319-x.xBD5/YD5
TSOT-23-5 (D5)
Top View
Pin Description
Pin Number
MLF®-6
Fixed
Pin Number
MLF®-6
Adjustable
Pin Number
TSOT-23-5
Fixed
Pin Name
1
1
3
EN
2
2
2
GND
Ground.
Supply Input.
Pin Name
Enable Input: Active High. High = ON, Low = OFF. Do not leave
floating.
3
3
1
VIN
4
4
5
VOUT
−
5
−
ADJ
Adjustable Input: Connect to external resistor voltage divider
network.
5
−
NC
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
May 2010
Output Voltage.
Exposed Heatsink Pad connected to ground internally
3
M9999-052510
Micrel, Inc.
MIC5319
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, 5sec.)......................... 260°C
ESD Rating(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(4)
VIN = VOUT +1.0V; COUT = 2.2µF; IOUT = 100µA; TJ = 25°C, bold values indicate –40°C to +125°C, unless noted.
Parameter
Output Voltage Accuracy
Condition
Min.
Typ.
Max.
Variation from nominal VOUT
−1.0
+1.0
Variation from nominal VOUT, IOUT = 100mA to 500mA
−2.0
+2.0
Units
%
Feedback Voltage
1.2375
1.25
1.2625
(ADJ Option)
1.225
1.25
1.275
VIN = VOUT +1V to 5.5V
0.04
0.3
%/V
IOUT = 100µA to 500mA
0.1
0.5
%
IOUT = 50mA
20
40
IOUT = 500mA
200
400
Ground Pin Current(9)
IOUT = 0 to 500mA
90
150
Ground Pin Current in
Shutdown
VEN ≤ 0.2V
0.5
f = up to 1kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF
70
f = 10kHz; COUT = 2.2µF ceramic; CBYP = 0.1 µF
60
Line Regulation
(6)
Load Regulation
Dropout Voltage(7, 8)
Ripple Rejection
Current Limit
VOUT = 0V
Output Voltage Noise
Turn-On Time
Enable Input Voltage
Enable Input Current
V
mV
µA
µA
dB
700
mA
COUT = 2.2µF; CBYP = 0.1 µF; 10Hz to 100kHz
40
µVrms
COUT = 2.2µF; CBYP = 0.1 µF
40
600
Logic Low (Regulator Shutdown)
100
0.2
Logic High (Regulator Enabled)
1.2
VIL = ≤ 0.2V (Regulator Shutdown)
0.01
1
VIH = ≥ 1.0V (Regulator Shutdown)
0.01
1
µs
V
µA
Notes:
1.
Exceeding the absolute maximum rating may damage the device.
2.
The device is not guaranteed to function 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.
May 2010
4
M9999-052510
Micrel, Inc.
MIC5319
Typical Characteristics
May 2010
5
M9999-052510
Micrel, Inc.
MIC5319
Typical Characteristics (Continued)
May 2010
6
M9999-052510
Micrel, Inc.
MIC5319
Functional Characteristics
May 2010
7
M9999-052510
Micrel, Inc.
MIC5319
Functional Diagram
MIC5319 Block Diagram − Fixed
MIC5319 Block Diagram − Adjustable
May 2010
8
M9999-052510
Micrel, Inc.
MIC5319
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.
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-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.
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:
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 input-to-ground to provide stability.
Low-ESR
ceramic
capacitors
provide
optimal
performance at a minimum of space. Additional highfrequency 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.
⎛ R1 ⎞
VOUT = VREF ⎜1 +
⎟
⎝ R2 ⎠
VREF = 1.25V
Output Capacitor
The MIC5319 requires an output capacitor of 2.2µF or
greater to maintain stability. The design is optimized for
use with low-ESR 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. X7R-type 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.
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:
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.
May 2010
PD = (VIN − VOUT)IOUT + VIN × IGND
9
M9999-052510
Micrel, Inc.
MIC5319
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:
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.
PD = (3.3V − 2.8V) × 500mA
0.25W =
PD = 0.25W
125°C − TA
93°C/W
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: www.micrel.com/_PDF/other/LDOBk_ds.pdf
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:
⎛ TJ(max) − TA ⎞
PD(max) = ⎜
⎟
θJA
⎝
⎠
TJ(max) = 125°C, the maximum junction temperature of
the die. θJA thermal resistance = 93°C/W.
Table 1 shows junction-to-ambient thermal resistance for
the MIC5319 in the 2mm x 2mm MLF® package.
θJA Recommended
Minimum Footprint
θJC
2mm × 2mm MLF®
93°C/W
45°C/W
SOT-23-5
235°C/W
Package
Table 1. Thermal Resistance
May 2010
10
M9999-052510
Micrel, Inc.
MIC5319
Package Information
6-Pin 2mm × 2mm MLF® (ML)
May 2010
11
M9999-052510
Micrel, Inc.
MIC5319
Package Information (Continued)
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 a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2010 Micrel, Incorporated.
May 2010
12
M9999-052510
Similar pages