MIC69502 DATA SHEET (11/09/2015) DOWNLOAD

MIC69502
5A, Low VIN, Low VOUT µCap LDO
Regulator
General Description
Features
The MIC69502 is a 5A, low dropout linear regulator that
provides low voltage high current outputs with a minimum
of external components. It offers high precision and ultra
low dropout of 500mV under worst case conditions.
The MIC69502 operates from an input voltage of 1.65V to
5.5V. It is designed to drive digital circuits requiring low
voltage at high currents (i.e. PLDs, DSP, microcontroller,
etc.). The MIC69502 output is adjustable to a minimum of
0.5V.
The µCap design of the MIC69502 is optimized for stability
with low value low-ESR ceramic output capacitors.
Protection features of the MIC69502 include thermal
shutdown and current limit protection. Logic enable and
error flag pins are also available.
The MIC69502 is offered in the space-efficient S-PAK
package. It has an operating temperature range of
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
• Input voltage range: VIN: 1.65V to 5.5V
• ±1.0% initial output tolerance
• Maximum dropout (VIN – VOUT) of 500mV
over temperature
• Adjustable output voltage down to 0.5V
• Stable with 10µF ceramic output capacitor (5A)
• Excellent line and load regulation specifications
• Logic controlled shutdown
• Thermal shutdown and current limit protection
• 7-Pin S-Pak package
• –40°C to +125°C Temperature Junction
Applications
•
•
•
•
ASIC Core Voltage Regulator
PLD/FPGA Core Power Supply
Linear Point-of-Load Conversion
High-Speed Post-Regulator
___________________________________________________________________________________________________________
Typical Application
350
Dropout Voltage
vs. Temperature
300
250
200
150
5A
2.5A
100
50
Adjustable Regulator
0
VOUT = 1.8V
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
December 2006
M9999-121406-B
Micrel, Inc.
MIC69502
Ordering Information
Part Number*
Output
Current
Output
Voltage**
Junction
Temperature Range
Package
MIC69502WR
5A
Adj.
–40° to +125°C
7-Pin S-PAK
Note:
*
RoHS compliant with ‘high-melting solder’ exemption.
** For fixed voltages available, please contact Micrel marketing for details.
Pin Configuration
7
6
5
4
3
2
1
ADJ
VOUT
VOUT
GND
VIN
VIN
EN
7-Pin S-PAK (R)
Pin Description
Pin Number
Pin Name
1
EN
Enable (Input): CMOS compatible input. Logic high = enable,
logic low = shutdown. Do not float.
2, 3
VIN
Input voltage which supplies current to the output power device.
4
GND
Ground (TAB is connected to ground on S-Pak).
5, 6
VOUT
Regulator Output.
7
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ADJ
Pin Function
Adjustable regulator feedback input. Connect to resistor voltage divider. Applies
only to adjustable output voltage parts.
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MIC69502
Absolute Maximum Ratings(1)
Operating Ratings(2)
Supply Input Voltage (VIN)...........................................+6.0V
Enable Input Voltage (VEN).............................................. VIN
Power Dissipation (PD) ........................... Internally Limited(3)
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Supply Voltage (VIN)................................... +1.65V to +5.5V
Enable Input Voltage (VEN)..................................... 0V to VIN
Junction Temperature (TJ) ..................–40°C ≤ TJ ≤ +125°C
Package Thermal Resistance
S-PAK-7 (θJC).......................................................2°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VOUT + 1V; bold values indicate –40°C< TJ < +125°C; IOUT = 10mA, unless noted.
Parameter
Output Voltage Accuracy
Output Voltage Line Regulation
(Note 5)
Output Voltage Load Regulation
VIN – VO; Dropout Voltage
(Note 6)
Ground Pin Current
Ground Pin Current in Shutdown
Current Limit
Start-up Time
Enable Input
Enable Input Threshold
Enable Pin Input Current
Conditions
At 25°C
Over temperature range
VIN = VOUT +1.0V to 5.5V
Min
–1
–2
Typ
0.2
IL = 10mA to 5A
IL = 2.5A
IL = 5.0A
IL = 10mA
IL = 500mA
IL = 2.5A
IL = 5.0A
VEN = 0V
0.2
160
250
5.5
VEN = VIN
Regulator enable
Regulator shutdown
VIN ≤ 0.2V (Regulator shutdown)
VIN ≤ 0.8V (Regulator enable)
0.8
1
3
20
54
5
10
50
Max
+1
+2
0.5
300
500
5
10
50
150
10
150
0.6
0.2
1
100
Units
%
%
%
%
mV
mV
mA
mA
mA
mA
µA
A
µs
V
V
µA
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 will go into thermal shutdown.
4. Specification for packaged product only.
5. Minimum input for line regulation test is set to VOUT + 1V relative to the highest output voltage.
6. 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.
For outputs below 1.65V, dropout voltage is considered the input-to-output voltage differential with the minimum input voltage of 1.65V. Minimum
input operating voltage is 1.65V.
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MIC69502
Typical Characteristics
1.95
Output Voltage
vs. Temperature
70
60
1.90
1.85
1.80
1.65
400
60
50
40
40
30
2.5A
20
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 10µF
IOUT = 10mA
1.70
10
0
20 40 60 80
TEMPERATURE (°C)
Dropout Voltage
vs. Load Current
1.84
Ground Current
vs. Load Current
70
5A
50
30
1.75
Ground Current
vs. Temperature
20
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
Output Voltage
vs. Load Current
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 10µF
10
0
0
1
2
3
4
LOAD CURRENT (A)
5
Output Voltage
vs. Input Voltage
2.0
350
1.82
300
250
1.5
0.01A
1.80
1.0
200
100
0.65
1.76
VOUT = 1.8V
COUT = 10µF
50
0
0
5A
1.78
150
1
2
3
4
LOAD CURRENT (A)
5
Enable Threshold
vs. Input Voltage
1.74
0
350
1
2
3
4
LOAD CURRENT (A)
Dropout Voltage
vs. Temperature
300
0.60
0.55
150
VOUT = 1.8V
COUT = 10µF
IOUT = 10mA
0.45
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
50
0
5
60
VOUT = 1.8V
COUT = 10µF
1
2
3
4
INPUT VOLTAGE (V)
5
Power Supply
Rejection Ratio
2A
40 3A
5A
100mA
30
2.5A
20
100
0.50
2.5A
0
0
50
250
200
0.5
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 10µF
VOUT = 1.8V
COUT = 10µF
20 40 60 80
TEMPERATURE (°C)
1A
10
0
0.01
0.1
1
10
100 1,000
FREQUENCY (kHz)
Thermal Shutdown
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
100
120 140 160 180
TEMPERATURE (C)
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200
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Micrel, Inc.
MIC69502
Functional Characteristics
Line Transient
5V
Input Voltage
(500mV/div)
Output Voltage
(1V/div)
Enable
4V
VIN = VOUT + 1V
COUT = 10µF
Output Voltage
(20mV/div)
Enable
(500mV/div)
VOUT = 1.8V
VIN = VOUT + 1V
VOUT = 1.8V
COUT = 10µF
IOUT = 10mA
IOUT = 10mA
Time (4µs/div)
Time (400µs/div)
Load Transient
VIN = VOUT + 1V
Output Current
(2.5A/div)
Output Voltage
(50mV/div)
VOUT = 1.8V
COUT = 10µF
5A
10mA
Time (400µs/div)
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MIC69502
Functional Diagram
IN
OUT
ENABLE
EN
0.5V
VREF
ADJ
GND
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MIC69502
Minimum Load Current
The MIC69502 regulator is specified between finite
loads. If the output current is too small, leakage currents
dominate and the output voltage rises. A 10mA minimum
load current is necessary for proper operation.
Application Information
The MIC69502 is an ultra-high performance low dropout
linear regulator designed for high current applications
requiring fast transient response. It utilizes a single input
supply and has very low dropout voltage perfect for lowvoltage DC-to-DC conversion. The MIC69502 requires a
minimum of external components. As a µCap regulator
the output is tolerant of virtually any type of capacitor
including ceramic and tantalum.
The MIC69502 regulator is fully protected from damage
due to fault conditions offering constant current limiting
and thermal shutdown.
Adjustable Regulator Design
The MIC69502 adjustable version allows programming
the output voltage anywhere between 0.5V and 5.5V
with two resistors. The resistor value between VOUT and
the adjust pin should not exceed 10kΩ. Larger values
can cause instability. The resistor values are calculated
by:
⎛R
⎞
VOUT = 0.5 ∗ ⎜⎜ 1 + 1⎟⎟
⎝ R2
⎠
Input Supply Voltage
VIN provides high current to the collector of the pass
transistor. The minimum input voltage is 1.65V allowing
conversion from low voltage supplies.
Where VOUT is the desired output voltage.
Enable
The MIC69502 features an active high enable input (EN)
that allows on-off control of the regulator. Current drain
reduces to near “zero” when the device is shutdown,
with only microamperes of leakage current. The EN input
has TTL/CMOS compatible thresholds for simple logic
interfacing. EN may be directly tied to VIN and pulled up
to the maximum supply voltage.
Output Capacitor
The MIC69502 requires a minimum of output
capacitance to maintain stability. However, proper
capacitor selection is important to ensure desired
transient response. The MIC69502 is specifically
designed to be stable with a wide range of capacitance
values and ESR. A 10µF ceramic chip capacitor should
satisfy most applications. See typical characteristics for
examples of load transient response.
X7R dielectric ceramic capacitors are recommended
because of their temperature performance. X7R-type
capacitors change capacitance by only 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 or a
tantalum capacitor to ensure the same capacitance
value over the operating temperature range. Tantalum
capacitors have a very stable dielectric (10% over their
operating temperature range) and can also be used with
this device.
Thermal Design
Linear regulators are simple to use. The most
complicated design parameters to consider are thermal
characteristics. Thermal design requires the following
application-specific parameters:
• Maximum ambient temperature (TA)
• Output current (IOUT)
• Output voltage (VOUT)
• Input voltage (VIN)
• Ground current (IGND)
First, calculate the power dissipation of the regulator
from these numbers and the device parameters from this
data sheet.
PD = (VIN – VOUT) IOUT + VIN IGND
where the ground current is approximated by using
numbers from the “Electrical Characteristics” or “Typical
Characteristics” sections. The heat sink thermal
resistance is then determined with this formula:
θSA = ((TJ(max) – TA)/ PD) – (θJC + θCS)
Where TJ(max) ≤125°C and θCS is between 0°C and
2°C/W.
Input Capacitor
An input capacitor of 1µF or greater is recommended
when the device is more than 4 inches away from the
bulk supply capacitance or when the supply is a battery.
Small, surface mount, ceramic chip capacitors can be
used for the bypassing. The capacitor should be placed
within 1" of the device for optimal performance. Larger
values will help to improve ripple rejection by bypassing
the input to the regulator further improving the integrity of
the output voltage.
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MIC69502
The heat sink may be significantly reduced in
applications where the minimum input voltage is known
and is large compared with the dropout voltage. Use a
series input resistor to drop excessive voltage and
distribute the heat between this resistor and the
regulator. The low dropout properties of Micrel Super
βeta PNP® regulators allow significant reductions in
regulator power dissipation and the associated heat sink
December 2006
without compromising performance. When this technique
is employed, a capacitor of at least 1.0µF is needed
directly between the input and regulator ground.
Refer to “Application Note 9” for further details and
examples on thermal design and heat sink applications.
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MIC69502
Package Information
7-Pin S-PAK (R)
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.
© 2006 Micrel, Incorporated.
December 2006
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