MIC29750-3.3BK [MICREL]
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| 型号： | MIC29750-3.3BK |
| 厂家： | 
MICREL SEMICONDUCTOR |
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MIC29150/29300/29500/29750
High-Current Low-Dropout Regulators
General Description
Features
The MIC29150/29300/29500/29750 are high current, high
accuracy, low-dropout voltage regulators. Using Micrel's
proprietary Super βeta PNP® process with a PNP pass
element, these regulators feature 350mV to 425mV (full
load) typical dropout voltages and very low ground current.
Designed for high current loads, these devices also find
applications in lower current, extremely low dropout-critical
systems, where their tiny dropout voltage and ground
current values are important attributes.
• High current capability
MIC29150/29151/29152/29153.................................1.5A
MIC29300/29301/29302/29303....................................3A
MIC29500/29501/29502/29503....................................5A
MIC29750/29751/29752............................................7.5A
• Low-dropout voltage
• Low ground current
• Accurate 1% guaranteed tolerance
• Extremely fast transient response
• Reverse-battery and “Load Dump” protection
• Zero-current shutdown mode (5-pin versions)
The MIC29150/29300/29500/29750 are fully protected
against overcurrent faults, reversed input polarity, reversed
lead insertion, overtemperature operation, and positive
and negative transient voltage spikes. Five pin fixed
voltage versions feature logic level ON/OFF control and an
error flag which signals whenever the output falls out of
regulation. Flagged states include low input voltage
(dropout), output current limit, overtemperature shutdown,
and extremely high voltage spikes on the input.
• Error flag signals output out-of-regulation (5-pin
versions)
• Also characterized for smaller loads with industry-
leading performance specifications
• Fixed voltage and adjustable versions
On the MIC29xx1 and MIC29xx2, the ENABLE pin may be
tied to VIN if it is not required for ON/OFF control. The
MIC29150/29300/29500 are available in 3-pin and 5-pin
TO-220 and surface mount TO-263 (D2Pak) packages.
The MIC29750 7.5A regulators are available in 3-pin and
5-pin TO-247 packages. The 1.5A, adjustable output
MIC29152 is available in a 5-pin power D-Pak (TO-252)
package.
Applications
• Battery powered equipment
• High-efficiency “Green” computer systems
• Automotive electronics
• High-efficiency linear lower supplies
• High-efficiency lost-regulator for switching supply
For applications with input voltage 6V or below, see
MIC37xxx LDOs.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
_________________________________________________________________________________________________________________________
Typical Application**
Adjustable Output Voltage
Fixed Output Voltage
(*See Minimum Load Current Section)
**See Thermal Design Section
Super βeta PNP 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
M9999-050510-B
May 2010
Micrel, Inc.
MIC29150/29300/29500/29750
Ordering Information
Part Number
Junction Temp.
Range(1)
Voltage
Current
Package
Standard
RoHS Compliant(2)
MIC29150-3.3WT(2)
MIC29150-3.3WU(2)
MIC29150-5.0WT(2)
MIC29150-5.0WU(2)
MIC29150-12WT(2)
MIC29150-12WU(2)
MIC29151-3.3WT(2)
MIC29151-3.3WU(2)
MIC29151-5.0WT(2)
MIC29151-5.0WU(2)
MIC29151-12WT(2)
MIC29151-12WU(2)
MIC29152WT(2)
MIC29150-3.3BT
MIC29150-3.3BU
MIC29150-5.0BT
MIC29150-5.0BU
MIC29150-12BT
MIC29150-12BU
MIC29151-3.3BT
MIC29151-3.3BU
MIC29151-5.0BT
MIC29151-5.0BU
MIC29151-12BT
MIC29151-12BU
MIC29152BT
–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
–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
–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
–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
–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
–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
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
–40°C to +125°C
3.3
3.3
5
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
1.5A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
3.0A
5.0A
5.0A
5.0A
5.0A
5.0A
5.0A
5.0A
3-Pin TO-220
3-Pin TO-263
3-Pin TO-220
3-Pin TO-263
3-Pin TO-220
3-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-252
5-Pin TO-220
5-Pin TO-263
3-Pin TO-220
3-Pin TO-263
3-Pin TO-220
3-Pin TO-263
3-Pin TO-220
3-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
3-Pin TO-220
3-Pin TO-220
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
5-Pin TO-220
5
12
12
3.3
3.3
5
5
12
12
Adj.
Adj.
Adj.
Adj.
Adj.
3.3
3.3
5
MIC29152BU
MIC29152WU(2)
MIC29152WD(2)
—
MIC29153BT(3)
MIC29153BU(3)
MIC29300-3.3BT
MIC29300-3.3BU
MIC29300-5.0BT
MIC29300-5.0BU
MIC29300-12BT
MIC29300-12BU
MIC29301-3.3BT
MIC29301-3.3BU
MIC29301-5.0BT
MIC29301-5.0BU
MIC29301-12BT
MIC29301-12BU
MIC29302BT
Contact Factory
Contact Factory
MIC29300-3.3WT(2)
MIC29300-3.3WU(2)
MIC29300-5.0WT(2)
MIC29300-5.0WU(2)
MIC29300-12WT(2)
MIC29300-12WU(2)
MIC29301-3.3WT(2)
MIC29301-3.3WU(2)
MIC29301-5.0WT(2)
MIC29301-5.0WU(2)
MIC29301-12WT(2)
MIC29301-12WU(2)
MIC29302WT(2)
MIC29302WU(2)
MIC29303WT(2)
MIC29303WU(2)
MIC29500-3.3WT(2)
MIC29500-5.0WT(2)
MIC29501-3.3WT(2)
MIC29501-3.3WU(2)
MIC29501-5.0WT(2)
MIC29501-5.0WU(2)
MIC29502WT(2)
5
12
12
3.3
3.3
5
5
12
12
Adj.
Adj.
Adj.
Adj.
3.3
5
MIC29302BU
MIC29303BT
MIC29303BU
MIC29500-3.3BT
MIC29500-5.0BT
MIC29501-3.3BT
MIC29501-3.3BU
MIC29501-5.0BT
MIC29501-5.0BU
MIC29502BT
3.3
3.3
5
5
Adj.
M9999-050510-B
May 2010
2
Micrel, Inc.
MIC29150/29300/29500/29750
Part Number
RoHS Compliant(2)
Junction Temp.
Range(1)
Voltage
Current
Package
Standard
MIC29502BU
MIC29502WU(2)
MIC29503WT(2)
MIC29503WU(2)
Contact Factory
Contact Factory
Contact Factory
Contact Factory
MIC29752WWT(2)
–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
–40°C to +125°C
–40°C to +125°C
Adj.
Adj.
Adj.
3.3
5
5.0A
5.0A
5.0A
7.5A
7.5A
7.5A
7.5A
7.5A
5-Pin TO-263
5-Pin TO-220
5-Pin TO-263
3-Pin TO-247
3-Pin TO-247
5-Pin TO-247
5-Pin TO-247
5-Pin TO-247
MIC29503BT
MIC29503BU
MIC29750-3.3BWT
MIC29750-5.0BWT
MIC29751-3.3BWT
MIC29751-5.0BWT
MIC29752BWT
3.3
5
Adj.
Note:
1. Junction Temperature
2. RoHS compliant with ‘high-melting solder’ exemption.
3. Special Order, Contact Factory
Pin Configuration
3-Pin TO-220 (T)
MIC29150/29300/29500
5-Pin TO-220 Fixed Voltage (T)
MIC29151/29301/29501/29751
5-Pin TO-220 Adjustable Voltage (T)
MIC29152/29302/29502
5-Pin TO-220 Adjustable with Flag (T)
MIC29153/29303/29503
3-Pin TO-247 (WT)
MIC29750
5-Pin TO-247 Fixed Voltage (WT)
MIC29751
5-Pin TO-247 Adjustable Voltage (WT)
MIC29752
3-Pin TO-263 (D2Pak) (UT)
MIC29150/29300
M9999-050510-B
May 2010
3
Micrel, Inc.
MIC29150/29300/29500/29750
5-Pin TO-263 (D2Pak) Fixed Voltage (U)
5-Pin TO-263 (D2Pak) Adjustable Voltage (U)
MIC29302/29502
MIC29151/29301/29501
5-Pin TO-263 (D2Pak) Adjustable with Flag (U)
MIC29153/29303/29503
5-Pin TO-252 (D-Pak) Adjustable Voltage (D)
MIC29152
Pin Description
Pin Number
Pin Name
TO-220
TO-247
TO-263
1
2
3
INPUT: Supplies the current to the output power device
GND: TAB is also connected internally to the IC’s ground on D-PAK.
OUTPUT: The regulator output voltage
Pin Description
Pin Number
Fixed
Pin Number
Adjustable
TO-220
Pin Number
Adj. with Flag
TO-220
Pin Name
TO-220
TO-247
TO-263
TO-247
TO-252
TO-247
TO-263
TO-263
1
1
—
ENABLE: CMOS compatible control input.
Logic high = enable, logic low = shutdown.
2
3, TAB
4
2
2
INPUT: Supplies the current to the output power device
GND: TAB is also connected internally to the IC’s ground on D-PAK.
OUTPUT: The regulator output voltage
3, TAB
3, TAB
4
5
4
5
—
ADJUST: Adjustable regulator feedback input that connects to the resistor
voltage divider that is placed from OUTPUT to GND in order to set the
output voltage.
5
—
1
FLAG: Active low error flag output signal that indicates an output fault
condition
M9999-050510-B
May 2010
4
Micrel, Inc.
MIC29150/29300/29500/29750
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Supply Voltage (VIN)(1) ........................... –20V to +60V
Enable Input Voltage (VEN)................................–0.3V to VIN
Lead Temperature (soldering, 5sec.)......................... 260°C
Power Dissipation .....................................Internally Limited
Storage Temperature Range ....................–65°C to +150°C
ESD Rating................................................................ Note 3
Operating Junction Temperature ..............–40°C to +125°C
Maximum Operating Input Voltage ................................26V
Package Thermal Resistance
TO-220 (θJC).........................................................2°C/W
TO-263 (θJC).........................................................2°C/W
TO-247 (θJC) .....................................................1.5°C/W
TO-252 (θJC).........................................................3°C/W
TO-252 (θJA) ......................................................56°C/W
Electrical Characteristics(4,13)
VIN = VOUT + 1V; IOUT = 10mA; TJ = 25°C, bold values indicate –40°C≤ TJ ≤ +125°C, unless noted.
Parameter
Condition
Min
–1
Typ
Max
1
Units
%
Output Voltage
IOUT = 10mA
10mA ≤ IOUT ≤ IFL, (VOUT + 1V) ≤ VIN ≤26V (5)
IOUT = 10mA, (VOUT + 1V) ≤ VIN ≤26V
VIN = VOUT + 5V, 10mA ≤ IOUT ≤ 1.5A (5,9)
Output Voltage (9)
Temperature Coefficient.
–2
2
%
Line Regulation
Load Regulation
0.06
0.2
20
0.5
1
%
%
∆VO
∆T
100
ppm/°C
Dropout Voltage
∆VOUT = -1% (6)
MIC29150
MIC29300
MIC29500
MIC29750
I
OUT = 100mA
80
200
mV
IOUT = 750mA
220
350
80
250
370
125
250
370
80
IOUT = 1.5A
600
175
IOUT = 100mA
IOUT = 1.5A
IOUT = 3A
600
250
IOUT = 250mA
IOUT = 2.5A
IOUT = 5A
600
200
IOUT = 250mA
IOUT = 4A
270
425
IOUT = 7.5A
750
Ground Current
MIC29150
MIC29300
MIC29500
I
OUT = 750mA, VIN = VOUT + 1V
8
22
10
37
15
70
35
120
20
mA
mA
mA
mA
IOUT = 1.5A
OUT = 1.5A, VIN = VOUT + 1V
IOUT = 3A
I
35
50
75
I
I
OUT = 2.5A, VIN = VOUT + 1V
OUT = 5A
MIC29750
IOUT = 4A, VIN = VOUT + 1V
OUT = 7.5A
I
Note 8
IGRNDDOGround Pin
Current at Droupout
VIN = 0.5V less than specified VOUT × IOUT = 10mA
MIC29150
MIC29300
MIC29500
MIC29750
0.9
1.7
2.1
3.1
mA
mA
mA
mA
Current Limit
May 2010
MIC29150
MIC29300
MIC29500
MIC29750
VOUT = 0V (7)
VOUT = 0V (7)
VOUT = 0V (7)
VOUT = 0V (7)
2.1
4.5
7.5
9.5
3.5
5.0
10.0
15
A
A
A
A
M9999-050510-B
5
Micrel, Inc.
MIC29150/29300/29500/29750
Parameter
Condition
Min
Typ
Max
Units
en, Output Noise
Voltage
CL = 10µF
400
µV
(rms)
(10Hz to 100kHz)
IL = 100mA
CL = 33µF
260
2
Ground Current in
Shutdown
MIC29150/1/2/3 only VEN = 0.4V
10
30
µA
µA
Reference
MIC29xx2/MIC29xx3
Reference Voltage
1.228 1.240 1.252
V
V
1.215
1.265
Reference Voltage
1.203
1.277
V
Adjust Pin
Bias Current
40
20
80
120
nA
(10)
Reference Voltage
Temperature
Coefficient
ppm/°C
nA/°C
Adjust Pin Bias
Current
0.1
Temperature
Coefficient
Flag Output (Error Comparator) MIC29xx1/29xx3
Output Leakage
Current
VOH = 26V
0.01
220
1.00
2.00
µA
Output Low Voltage
Device set for 5V, VIN = 4.5V
300
mV
IOL = 250µA
400
Upper Threshold
Voltage
Device set for 5V (11)
40
25
60
75
15
mV
mV
mV
Lower Threshold
Voltage
Device set for 5V (11)
95
140
Hysteresis
Device set for 5V (11)
ENABLE Input
MIC29xx1/MIC29xx2
Input Logic Voltage
Low (OFF)
V
0.8
High (ON)
2.4
VEN = 26V
100
10
600
750
µA
µA
µA
Enable Pin
Input Current
VEN = 0.8V
0.7
2
4
(12)
Regulator Output
Current in Shutdown
500
M9999-050510-B
May 2010
6
Micrel, Inc.
MIC29150/29300/29500/29750
Notes:
1. Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (≤1%). The maximum continuous supply voltage is
26V. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended.
4. Specification for packaged product only.
5. Full load current (IFL) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families.
6. Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its normal value with VOUT + 1V applied to VIN.
7.
V
IN = VOUT (nominal) + 1V. For example, use VIN = 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to pin
current.
8. Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin
current.
9. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
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 a200mA load pulse at VIN = 20V (a 4W pulse) for T = 10ms.
11. Comparator thresholds are expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured at 6V
input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example,
at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95mV x 5V/1.240V = 384mV. Thresholds
remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
12.
VEN ≤ 0.8V and VIN ≤ 26V, VOUT = 0.
13. When used in dual supply systems where the regulator load is returned to a negative supply, the output voltage must be diode clamped to ground.
M9999-050510-B
May 2010
7
Micrel, Inc.
MIC29150/29300/29500/29750
Typical Characteristics MIC2915x
M9999-050510-B
May 2010
8
Micrel, Inc.
MIC29150/29300/29500/29750
M9999-050510-B
May 2010
9
Micrel, Inc.
MIC29150/29300/29500/29750
Typical Characteristics MIC2930x
M9999-050510-B
May 2010
10
Micrel, Inc.
MIC29150/29300/29500/29750
M9999-050510-B
May 2010
11
Micrel, Inc.
MIC29150/29300/29500/29750
Typical Characteristics MIC2950x
M9999-050510-B
May 2010
12
Micrel, Inc.
MIC29150/29300/29500/29750
M9999-050510-B
May 2010
13
Micrel, Inc.
MIC29150/29300/29500/29750
Typical Characteristics MIC2975x
M9999-050510-B
May 2010
14
Micrel, Inc.
MIC29150/29300/29500/29750
M9999-050510-B
May 2010
15
Micrel, Inc.
MIC29150/29300/29500/29750
Functional Diagram
M9999-050510-B
May 2010
16
Micrel, Inc.
MIC29150/29300/29500/29750
• Output Current, IOUT
• Output Voltage, VOUT
• Input Voltage, VIN
First, we calculate the power dissipation of the regulator
from these numbers and the device parameters from this
datasheet.
Application Information
The
MIC29150/29300/29500/29750
are
high
performance low-dropout voltage regulators suitable for
all moderate to high-current voltage regulator
applications. Their 350mV to 425mV typical dropout
voltage at full load make them especially valuable in
battery powered systems and as high efficiency noise
filters in “post-regulator” applications. Unlike older NPN-
pass transistor designs, where the minimum dropout
voltage is limited by the base-emitter voltage drop and
collector-emitter saturation voltage, dropout performance
of the PNP output of these devices is limited merely by
the low VCE saturation voltage.
P = I
1.01V − V
)
D
OUT
IN
OUT
Where the ground current is approximated by 1% of IOUT
Then the heat sink thermal resistance is determined with
this formula:
.
T
− T
A
JMAX
θ
=
−
(
θ
+ θ
CS
)
SA
JC
P
D
A trade-off for the low-dropout voltage is a varying base
driver requirement. But Micrel’s Super ßeta PNP®
process reduces this drive requirement to merely 1% of
the load current.
Where TJMAX ≤ 125°C and θCS is between 0 and 2°C/W.
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
ßeta PNP® regulators allow very significant reductions in
regulator power dissipation and the associated heat sink
without compromising performance. When this technique
is employed, a capacitor of at least 0.1µF is needed
directly between the input and regulator ground.
The MIC29150/29300/29500/29750 family of regulators
are fully protected from damage due to fault conditions.
Current limiting is provided. This limiting is linear; output
current under overload conditions is constant. Thermal
shutdown disables the device when the die temperature
exceeds the 125°C maximum safe operating
temperature. Transient protection allows device (and
load) survival even when the input voltage spikes
between –20V and +60V. When the input voltage
exceeds about 35V to 40V, the over voltage sensor
temporarily disables the regulator. The output structure
of these regulators allows voltages in excess of the
desired output voltage to be applied without reverse
current flow. MIC29xx1 and MIC29xx2 versions offer a
logic level ON/OFF control: when disabled, the devices
draw nearly zero current.
Please refer to Application Note 9 and Application Hint
17 for further details and examples on thermal design
and heat sink specification.
With no heat sink in the application, calculate the
junction temperature to determine the maximum power
dissipation that will be allowed before exceeding the
maximum junction temperature of the MIC29152. The
maximum power allowed can be calculated using the
thermal resistance (θJA) of the D-Pak adhering to the
following criteria for the PCB design: 2 oz. copper and
100mm2 copper area for the MIC29152.
An additional feature of this regulator family is a common
pinout: a design’s current requirement may change up or
down yet use the same board layout, as all of these
regulators have identical pinouts.
For example, given an expected maximum ambient
temperature (TA) of 75°C with VIN = 3.3V, VOUT = 2.5V,
and IOUT = 1.5A, first calculate the expected PD using
Equation (1);
MIC29XXX
VOUT
VIN
OUT
IN
PD=(3.3V–2.5V)1.5A–(3.3V)(0.016A)=1.1472W
Next, calcualte the junction temperature for the expected
power dissipation.
GND
TJ=(θJA×PD)+TA=(56°C/W×1.1472W)+75°C=139.24°C
Figure 3. Linear regulators require only two capacitors for
operation.
Now determine the maximum power dissipation allowed
that would not exceed the IC’s maximum junction
temperature (125°C) without the useof a heat sink by
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:
PD(MAX)=(TJ(MAX)–TA)/θJA=(125°C–75°C)/(56°C/W) =0.893W
• Maximum ambient temperature, TA
M9999-050510-B
May 2010
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Micrel, Inc.
MIC29150/29300/29500/29750
Adjustable Regulator Design
Capacitor Requirements
For stability and minimum output noise, a capacitor on
the regulator output is necessary. The value of this
capacitor is dependent upon the output current; lower
currents
allow
smaller
capacitors.
The
MIC29152BT
MIC29150/29300/29500/29750 regulators are stable
with the following minimum capacitor values at full load:
Device
Full Load Capacitor
MIC29150...............................................10µF
MIC29300...............................................10µF
MIC29500...............................................10µF
MIC29750...............................................22µF
V
V
OUT
IN
R1
R2
This capacitor need not be an expensive low ESR type:
aluminum electrolytics are adequate. In fact, extremely
low ESR capacitors may contribute to instability.
Tantalum capacitors are recommended for systems
where fast load transient response is important.
10µF
22µF
Figure 4. Adjustable Regulator with Resistors
Where the regulator is powered from a source with a
high AC impedance, a 0.1µF capacitor connected
between Input and GND is recommended. This capacitor
should have good characteristics to above 250kHz.
The adjustable regulator versions, MIC29xx2 and
MIC29xx3, allow programming the output voltage
anywhere between 1.25V and the 25V. Two resistors are
used. The resistor values are calculated by:
Minimum Load Current
V
The MIC29150–29750 regulators are specified between
finite loads. If the output current is too small, leakage
currents dominate and the output voltage rises. The
following minimum load current swamps any expected
leakage current across the operating temperature range:
⎛
⎞
OUT
R1 = R2 × ⎜
− 1⎟
⎜
⎟
1.240
⎝
⎠
where VOUT is the desired output voltage. Figure 4 shows
component definition. Applications with widely varying
load currents may scale the resistors to draw the
minimum load current required for proper operation (see
“Minimum Load Current” section).
Device
Minimum Load
MIC29150................................................5mA
MIC29300................................................7mA
MIC29500..............................................10mA
MIC29750..............................................10mA
Error Flag
MIC29xx1 and MIC29xx3 versions feature an Error Flag,
which looks at the output voltage and signals an error
condition when this voltage drops 5% below its expected
value. The error flag is an open-collector output that
pulls low under fault conditions. It may sink 10mA. Low
output voltage signifies a number of possible problems,
including an overcurrent fault (the device is in current
limit) and low input voltage. The flag output is inoperative
during overtemperature shutdown conditions.
Enable Input
MIC29xx1 and MIC29xx2 versions feature an enable
(EN) input that allows ON/OFF control of the device.
Special design allows “zero” current drain when the
device is disabled—only microamperes of leakage
current flows. The EN input has TTL/CMOS compatible
thresholds for simple interfacing with logic, or may be
directly tied to ≤30V. Enabling the regulator requires
approximately 20µA of current.
M9999-050510-B
May 2010
18
Micrel, Inc.
MIC29150/29300/29500/29750
Package Information
3-Pin TO-220 (T)
5-Pin TO-220 (T)
M9999-050510-B
May 2010
19
Micrel, Inc.
MIC29150/29300/29500/29750
5-Pin TO-263 (U)
3-Pin TO-263 (U)
M9999-050510-B
May 2010
20
Micrel, Inc.
MIC29150/29300/29500/29750
5-Pin TO-247 (WT)
3-Pin TO-247 (WT)
M9999-050510-B
May 2010
21
Micrel, Inc.
MIC29150/29300/29500/29750
5-Pin TO-252 (D)
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.
© 2009 Micrel, Incorporated.
M9999-050510-B
May 2010
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Micrel, Inc.
MIC29150/29300/29500/29750
Revision History
Date
Change Description/Edits by:
Revisions
6/18/08
5/28/09
6/3/09
Locked document. M.Mclean
15
16
Unlocked document, removed some styles, minor formatting. M.Galvan
Fixed EC table font from 10pst to pts, moved Typ. App. drwg to front page
Edited EC table and diagrams, added pin descriptions.
Added EVB Circuit and BOM. Text added to Thermal Design section
Removed EVB Circuit and BOM
7/23/09
9/18/09
9/22/09
10/12/09
072309_AMSr1
091809_AMS
092409_AMS
Update drawings and curves
Martha taken
over for Mike
M9999-050510-B
May 2010
23
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