MIC29750-5.0BWT [MICREL]
High-Current Low-Dropout Regulators; 高电流低压差稳压器
| 型号： | MIC29750-5.0BWT |
| 厂家： | 
MICREL SEMICONDUCTOR |
| 描述： | High-Current Low-Dropout Regulators |
| 文件： | 总20页 (文件大小：134K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MIC29150/29300/29500/29750 Series
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 ßeta PNP™ process with a PNP pass
element, theseregulatorsfeature300mVto370mV(fullload)
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 ....................... 350mV at Full Load
• Low Ground Current
• Accurate 1% Guaranteed Tolerance
• Extremely Fast Transient Response
• Reverse-battery and “Load Dump” Protection
• Zero-Current Shutdown Mode (5-Pin versions)
• Error Flag Signals Output Out-of-Regulation
(5-Pin versions)
• Also Characterized For Smaller Loads With Industry-
Leading Performance Specifications
TheMIC29150/29300/29500/29750arefullyprotectedagainst
overcurrent faults, reversed input polarity, reversed lead
insertion, overtemperatureoperation, andpositiveandnega-
tive 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.
• Fixed Voltage and Adjustable Versions
Applications
• Battery Powered Equipment
• High-Efficiency “Green” Computer Systems
• Automotive Electronics
• High-Efficiency Linear Power Supplies
• High-Efficiency Post-Regulator For Switching Supply
On the MIC29xx1 and MIC29xx2, the ENABLE pin may be
tied to V if it is not required for ON/OFF control. The
IN
MIC29150/29300/29500areavailablein3-and5-pinTO-220
and surface mount TO-263 packages. The MIC29750 7.5A
regulators are available in 3- and 5-pin TO-247 packages.
Pin Configuration
1 2 3 4 5
1 2 3
MIC29151/29152/29153BU
MIC29150/29300BU
MIC29301/29302/29303BU
MIC29501/29502/29503BU
Pinout On all devices, the Tab is grounded.
MIC29150/29300/29500/29750 Three Terminal
Devices:
Pin 1 = Input, 2 = Ground, 3 = Output
MIC29151/29301/29501/29751 Five Terminal
Fixed Voltage Devices:
Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,
5 = Flag
1 2 3
1 2 3 4 5
MIC29150/29300/
29500BT and
MIC29750BWT
MIC29151/29152/29153BT
MIC29301/29302/29303BT
MIC29501/29502/29503BT
MIC29751/29752BWT
MIC29152/29302/29502/29752 Adjustable with
ON/OFF Control
Pin 1 = Enable, 2 = Input, 3 = Ground, 4 = Output,
5 = Adjust
MIC29153/29303/29503 Adjustable with Flag
Pin 1 = Flag, 2 = Input, 3 = Ground, 4 = Output,
5 = Adjust
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
March 2000
1
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Ordering Information
Part Number
Temp. Range* Volts Current Package
Part Number
Temp. Range* Volts Current Package
MIC29150-3.3BT
MIC29150-4.2BT
MIC29150-5.0BT
MIC29150-12BT
MIC29150-3.3BU
MIC29150-5.0BU
MIC29150-12BU
MIC29151-3.3BT
MIC29151-5.0BT
MIC29151-12BT
MIC29151-3.3BU
MIC29151-5.0BU
MIC29151-12BU
MIC29152BT
–40 to +125°C 3.3 1.5A TO-220
–40 to +125°C 4.2 1.5A TO-220
–40 to +125°C 5.0 1.5A TO-220
MIC29500-3.3BT
MIC29500-5.0BT
MIC29501-3.3BT
MIC29501-5.0BT
MIC29501-3.3BU
MIC29501-5.0BU
MIC29502BT
–40 to +125°C 3.3 5.0A TO-220
–40 to +125°C 5.0 5.0A TO-220
–40 to +125°C 3.3 5.0A TO-220-5
–40 to +125°C 5.0 5.0A TO-220-5
–40 to +125°C 3.3 5.0A TO-263-5
–40 to +125°C 5.0 5.0A TO-263-5
–40 to +125°C Adj 5.0A TO-220-5
–40 to +125°C Adj 5.0A TO-263-5
–40 to +125°C Adj 5.0A TO-220-5
–40 to +125°C Adj 5.0A TO-263-5
–40 to +125°C 12
1.5A TO-220
–40 to +125°C 3.3 1.5A TO-263
–40 to +125°C 5.0 1.5A TO-263
–40 to +125°C 12
1.5A TO-263
–40 to +125°C 3.3 1.5A TO-220-5
–40 to +125°C 5.0 1.5A TO-220-5
MIC29502BU
MIC29503BT
–40 to +125°C 12
1.5A TO-220-5
MIC29503BU
–40 to +125°C 3.3 1.5A TO-263-5
–40 to +125°C 5.0 1.5A TO-263-5
MIC29750-3.3BWT –40 to +125°C 3.3 7.5A TO-247-3
MIC29750-5.0BWT –40 to +125°C 5.0 7.5A TO-247-3
MIC29751-3.3BWT –40 to +125°C 3.3 7.5A TO-247-5
MIC29751-5.0BWT –40 to +125°C 5.0 7.5A TO-247-5
–40 to +125°C 12
1.5A TO-263-5
–40 to +125°C Adj 1.5A TO-220-5
–40 to +125°C Adj 1.5A TO-263-5
–40 to +125°C Adj 1.5A TO-220-5
–40 to +125°C Adj 1.5A TO-263-5
–40 to +125°C 3.3 3.0A TO-220
–40 to +125°C 5.0 3.0A TO-220
MIC29152BU
MIC29752BWT
–40 to +125°C Adj 7.5A TO-247-5
MIC29153BT
MIC29153BU
MIC29300-3.3BT
MIC29300-5.0BT
MIC29300-12BT
MIC29300-3.3BU
MIC29300-5.0BU
MIC29300-12BU
MIC29301-3.3BT
MIC29301-5.0BT
MIC29301-12BT
MIC29301-3.3BU
MIC29301-5.0BU
MIC29301-12BU
MIC29302BT
–40 to +125°C 12
3.0A TO-220
–40 to +125°C 3.3 3.0A TO-263
–40 to +125°C 5.0 3.0A TO-263
–40 to +125°C 12
3.0A TO-263
–40 to +125°C 3.3 3.0A TO-220-5
–40 to +125°C 5.0 3.0A TO-220-5
–40 to +125°C 12
3.0A TO-220-5
–40 to +125°C 3.3 3.0A TO-263-5
–40 to +125°C 5.0 3.0A TO-263-5
–40 to +125°C 12
3.0A TO-263-5
–40 to +125°C Adj 3.0A TO-220-5
–40 to +125°C Adj 3.0A TO-263-5
–40 to +125°C Adj 3.0A TO-220-5
–40 to +125°C Adj 3.0A TO-263-5
MIC29302BU
MIC29303BT
MIC29303BU
* Junction Temperature
MIC29xx0 versions are 3-terminal fixed voltage devices.
MIC29xx1arefixedvoltagedeviceswithENABLEandERROR
flag.MIC29xx2areadjustableregulatorswithENABLEcontrol.
MIC29xx3 are adjustables with an ERROR flag.
MIC29150/29300/29500/29750
2
March 2000
MIC29150/29300/29500/29750
Micrel
Absolute Maximum Ratings
Operating Ratings
Power Dissipation .................................... Internally Limited
Lead Temperature (Soldering, 5 seconds)................ 260°C
Storage Temperature Range ................... –65°C to +150°C
Input Supply Voltage (Note 1) ....................... –20V to +60V
Operating Junction Temperature ............. –40°C to +125°C
Maximum Operating Input Voltage............................... 26V
TO-220 θ .............................................................. 2°C/W
JC
TO-263 θ .............................................................. 2°C/W
JC
TO-247 θ ........................................................... 1.5°C/W
JC
Electrical Characteristics
All measurements at TJ = 25°C unless otherwise noted. Bold values are guaranteed across the operating temperature range.
Adjustable versions are programmed to 5.0V.
Parameter
Condition
Min
–1
Typ
Max
1
Units
%
Output Voltage
IO = 10mA
10mA ≤ IO ≤ IFL, (VOUT + 1V) ≤ VIN ≤ 26V (Note 2)
IO = 10mA, (VOUT + 1V) ≤ VIN ≤ 26V
VIN = VOUT + 5V, 10mA ≤ IOUT ≤ IFULL LOAD (Note 2, 6)
–2
2
%
Line Regulation
Load Regulation
0.06
0.2
20
0.5
1
%
%
∆VO
∆T
Output Voltage(Note 6)
Temperature Coef.
100
ppm/°C
Dropout Voltage
∆VOUT = – 1%, (Note 3)
MIC29150
MIC29300
MIC29500
MIC29750
IO = 100mA
80
200
mV
I
O = 750mA
220
350
80
250
370
125
250
370
80
IO = 1.5A
IO = 100mA
600
175
I
O = 1.5A
IO = 3A
IO = 250mA
600
250
I
O = 2.5A
IO = 5A
IO = 250mA
600
200
I
O = 4A
270
425
IO = 7.5A
600
20
Ground Current
MIC29150
MIC29300
MIC29500
MIC29750
I
O = 750mA, VIN = VOUT + 1V
IO = 1.5A
O = 1.5A, VIN = VOUT + 1V
8
22
10
37
15
70
35
120
mA
mA
mA
mA
I
35
50
75
IO = 3A
IO = 2.5A, VIN = VOUT + 1V
I
IO = 4A, VIN = VOUT + 1V
IO = 7.5A
O = 5A
IGNDDOGround Pin
VIN = 0.5V less than specified VOUT. IOUT = 10mA
Current at Dropout
MIC29150
MIC29300
MIC29500
MIC29750
0.9
1.7
2.1
3.1
mA
mA
mA
mA
Current Limit
MIC29150
MIC29300
MIC29500
MIC29750
V
OUT = 0V (Note 4)
VOUT = 0V (Note 4)
OUT = 0V (Note 4)
VOUT = 0V (Note 4)
2.1
4.5
7.5
9.5
3.5
5.0
10.0
15
A
A
A
A
V
en, Output Noise
Voltage
CL = 10µF
400
µV (rms)
(10Hz to 100kHz)
IL = 100mA
CL = 33µF
260
Ground Current in Shutdown
MIC29150/1/2/3 only VEN= 0.4V
2
10
30
µA
µA
March 2000
3
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Electrical Characteristics (Continued)
Reference
MIC29xx2/MIC29xx3
Parameter
Conditions
Min
Typical
Max
Units
Reference Voltage
Reference Voltage
1.228
1.215
1.240
1.252
1.265
V
V max
(Note 8)
(Note 7)
1.203
1.277
V
Adjust Pin
Bias Current
40
20
80
120
nA
Reference Voltage
Temperature
Coefficient
ppm/°C
nA/°C
Adjust Pin Bias
Current Temperature
Coefficient
0.1
Flag Output (Error Comparator) MIC29xx1/29xx3
Output Leakage
Current
VOH = 26V
0.01
220
60
1.00
2.00
µA
mV
mV
mV
mV
Output Low
Voltage
Device set for 5V. VIN = 4.5V
IOL = 250µA
300
400
Upper Threshold
Voltage
Device set for 5V (Note 9)
Device set for 5V (Note 9)
40
25
Lower Threshold
Voltage
75
95
140
Hysteresis
Device set for 5V (Note 9)
15
MIC29xx1/MIC29xx2
ENABLE Input
Input Logic Voltage
Low (OFF)
V
0.8
High (ON)
2.4
Enable Pin
Input Current
VEN = 26V
100
10
600
750
µA
VEN =0.8V
(Note 10)
1
2
µA
µA
Regulator Output
Current in Shutdown
500
MIC29150/29300/29500/29750
4
March 2000
MIC29150/29300/29500/29750
Micrel
Notes
Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (≤1%). The maximum continuous supply
voltage is 26V.
Note 2: Full Load current (I ) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families.
FL
Note 3: Dropout voltage is defined as the input-to-output differential when the output voltage drops to 99% of its nominal value with V
+ 1V applied
OUT
to V
IN
Note 4:
V
= V
+ 1V. For example, use V = 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to
IN
OUT (nominal) IN
minimize temperature rise.
Note 5: 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.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 7: 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 a 200mA load pulse at V = 20V (a 4W pulse) for T = 10ms.
IN
Note 8:
Note 9: 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 = V /V = (R1 + R2)/R2. For
V
≤ V
≤ (V – 1 V), 2.3V ≤ V ≤ 26V, 10mA < I ≤ I , T ≤ T
REF
OUT IN IN L FL J J MAX.
OUT
REF
example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.240 V = 384
mV. Thresholds remain constant as a percent of V
7.7% guaranteed.
as V
is varied, with the dropout warning occurring at typically 5% below nominal,
OUT
OUT
Note 10: V ≤ 0.8V and V ≤ 26V, V = 0.
OUT
EN
IN
Note 11: 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.
Block Diagram
IN
OUT
O.V.
ILIMIT
28V
1.240V
1.180V
R1*
Reference
FLAG
EN
ADJ†
Thermal
Shut-
down
R2*
GND
* Feedback network in fixed versions only
†
Adjustable version only
Typical Applications
5V ± 5%
3.3V ± 1% @ 5A
47µF
MIC29500-3.3
V
V
OUT
IN
R1
R2
V
= 1.240V × [1 + (R1 / R2)]
OUT
Figure 1. Fixed output voltage.
Figure 2. Adjustable output voltage configuration. For
best results, the total series resistance should be small
enough to pass the minimum regulator load current.
March 2000
5
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Typical Characteristics MIC2915x
MIC2915x Dropout Voltage
MIC2915x Dropout Voltage
vs. Temperature
MIC29150-5.0
Dropout Characteristics
vs. Output Current
450
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5.0
4.0
3.0
2.0
1.0
0.0
400
350
300
250
200
150
100
50
IOUT = 10mA
IOUT = 1.5A
ILOAD = 1.5A
0
0.0
0.5
1.0
1.5
-60 -30
0
30 60 90 120 150
0
1
2
3
4
5
6
OUTPUT CURRENT (A)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC2915x Ground Current
vs. Output Current
MIC2915x Ground Current
vs. Supply Voltage
MIC2915x Ground Current
vs. Supply Voltage
25
20
15
10
5
1.2
1.0
0.8
0.6
0.4
0.2
0.0
60
50
40
30
20
10
0
VOUT = 5V
MIC29152
I
OUT = 1.5A
I
LOAD = 10mA
0
0.0
0.4
0.8
1.2
1.6
0
2
4
6
8
10
0
2
4
6
8
10
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MIC2915x Ground Current
vs. Temperature
MIC2915x Ground Current
vs. Temperature
MIC2915x Ground Current
vs. Temperature
300
250
200
150
100
50
2.5
2.0
1.5
1.0
0.5
0.0
30
25
20
15
10
5
ILOAD = 10mA
ILOAD = 1.5A
ILOAD = 250mA
0
0
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC29150-3.3 Output
Voltage vs. Temperature
MIC29150-3.3 Short Circuit
Current vs. Temperature
MIC2915x Ground Current
vs. Input Voltage
3.40
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
RLOAD = 100Ω
VOUT = 5V
VOUT = 0V
3 DEVICES
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-30 -20 -10
0
10 20 30
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC29150/29300/29500/29750
6
March 2000
MIC29150/29300/29500/29750
Micrel
MIC29151-xx/2 Enable Current
MIC2915x
Load Transient
MIC2915x
Load Transient
vs. Temperaure
30
400
200
0
200
100
0
COUT = 10 µF
COUT = 100 µF
25
20
-100
VEN = 5V
15
-220.0
1.5
-220.0
1.5
10
VEN = 2V
1.0
1.0
ILOAD = 10mA
ILOAD = 10mA
0.5
0.5
5
0
0.0
0.0
-0.5
-0.5
-60 -30
0
30 60 90 120 150
-5
0
5
10 15 20 25
-5
0
5
10 15 20 25
TEMPERATURE (°C)
TIME (ms)
TIME (ms)
MIC29152/3 Adjust Pin Current
vs. Temperature
MIC2915x
Line Transient
MIC2915x
Line Transient
50
30
20
10
0
10
5
COUT = 10 µF
COUT = 100 µF
40
30
20
10
0
0
-10
-210
1-50
8
ILOAD = 10mA
ILOAD = 10mA
8
6
4
ILOAD = 10mA
6
4
-60 -30
0
30 60 90 120 150
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
TEMPERATURE (°C)
MIC2915x Output Impedance
vs. Frequency
10
1
0.1
0.01
0.001
FREQUENCY (Hz)
March 2000
7
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Typical Characteristics MIC2930x
MIC2930x Dropout Voltage
MIC2930x Dropout Voltage
vs. Temperature
MIC29300-3.3
Dropout Characteristics
vs. Output Current
0.40
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5.0
4.0
3.0
2.0
1.0
0.0
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
ILOAD = 10mA
ILOAD = 3A
ILOAD = 3A
0
1
2
3
-60 -30
0
30 60 90 120 150
0
2
4
6
OUTPUT CURRENT (A)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC2930x Ground Current
vs. Output Current
MIC2930x Ground Current
vs. Supply Voltage
MIC2930x Ground Current
vs. Supply Voltage
50
40
30
20
10
0
2.0
1.5
1.0
0.5
0.0
125
100
75
50
25
0
FIXED 3.3V DEVICE
RLOAD = 100Ω
FIXED 3.3V
I
OUT = 3A
0
1
2
3
0
2
4
6
8
10
0
2
4
6
8
10
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MIC2930x Ground Current
vs. Temperature
MIC2930x Ground Current
vs. Temperature
MIC2930x Ground Current
vs. Temperature
0.5
0.4
0.3
0.2
0.1
0.0
2.0
1.5
1.0
0.5
0.0
60
50
40
30
20
10
0
IOUT = 3A
IOUT = 250mA
IOUT = 10mA
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC29300-3.3 Output Voltage
vs. Temperature
MIC29300-5.0 Short Circuit
Current vs. Temperature
MIC2930x Ground Current
vs. Input Voltage
3.40
8
7
6
5
4
3
2
1
0
2.0
1.5
1.0
0.5
0.0
-0.5
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
VOUT = 0V
3 DEVICES
RLOAD = 100Ω
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-30 -20 -10
0
10 20 30
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC29150/29300/29500/29750
8
March 2000
MIC29150/29300/29500/29750
Micrel
MIC29301-x/2 Enable Current
MIC2930x
Load Transient
MIC2930x
Load Transient
vs. Temperaure
30
800
600
400
200
0
100
50
0
COUT = 10 µF
COUT = 100 µF
25
20
-50
VEN = 5V
15
-2004
3
-1004
3
10
VEN = 2V
2
2
ILOAD = 10mA
ILOAD = 10mA
1
1
5
0
0
0
-1
-5
-1
-5
-60 -30
0
30 60 90 120 150
0
5
10 15 20 25
0
5
10 15 20 25
TEMPERATURE (°C)
TIME (ms)
TIME (ms)
MIC29302/3 Adjust Pin Current
vs. Temperature
MIC2930x
Line Transient
MIC2930x
Line Transient
50
40
20
0
15
10
5
COUT = 10 µF
COUT = 100 µF
40
30
20
10
0
0
-20
-84.03
-5
ILOAD = 10mA
-81.03
ILOAD = 10mA
ILOAD = 10mA
6.3
4.3
2.3
6.3
4.3
2.3
-60 -30
0
30 60 90 120 150
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
TEMPERATURE (°C)
MIC2930x Output Impedance
vs. Frequency
10
1
0.1
0.01
0.001
FREQUENCY (Hz)
March 2000
9
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Typical Characteristics MIC2950x
MIC2950x Dropout Voltage
MIC2950x Dropout Voltage
vs. Temperature
MIC29500-3.3
Dropout Characteristics
vs. Output Current
450
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
5.0
4.0
3.0
2.0
1.0
0.0
400
350
300
250
200
150
100
50
ILOAD = 10mA
ILOAD = 5A
ILOAD = 5A
0
0
1
2
3
4
5
-60 -30
0
30 60 90 120 150
0
2
4
6
OUTPUT CURRENT (A)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC2950x Ground Current
vs. Output Current
MIC2950x Ground Current
vs. Supply Voltage
MIC2950x Ground Current
vs. Supply Voltage
80
70
60
50
40
30
20
10
0
3.0
2.5
2.0
1.5
1.0
0.5
0.0
125
100
75
50
25
0
FIXED 3.3V VERSIONS
RLOAD = 100Ω
FIXED 3.3V
VERSION
ILOAD = 5A
0
1
2
3
4
5
6
0
2
4
6
8
10
0
1
2
3
4
5
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MIC2950x Ground Current
vs. Temperature
MIC2950x Ground Current
vs. Temperature
MIC2950x Ground Current
vs. Temperature
0.5
0.4
0.3
0.2
0.1
0.0
4
3
2
1
0
150
125
100
75
IOUT = 5A
50
IOUT = 10mA
IOUT = 500mA
25
0
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC29500-3.3 Output Voltage
vs. Temperature
MIC2950x-5.0 Short Circuit
Current vs. Temperature
MIC2950x Ground Current
vs. Input Voltage
3.40
10
9
8
7
6
5
4
3
2
1
0
2.5
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
2.0
1.5
1.0
0.5
0.0
-0.5
VOUT = 0V
3 DEVICES
RLOAD = 100Ω
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-30 -20 -10
0
10 20 30
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC29150/29300/29500/29750
10
March 2000
MIC29150/29300/29500/29750
Micrel
MIC29501-xx/2 Enable Current
MIC2950x
Load Transient
MIC2950x
Load Transient
vs. Temperaure
30
1500
1000
500
0
100
50
0
COUT = 10 µF
COUT = 100 µF
25
20
-50
VEN = 5V
15
-5006
5
-1006
5
4
4
10
VEN = 2V
3
2
1
0
-1
-5
3
2
1
0
-1
-5
ILOAD = 10mA
ILOAD = 10mA
5
0
-60 -30
0
30 60 90 120 150
0
5
10 15 20 25
0
5
10 15 20 25
TEMPERATURE (°C)
TIME (ms)
TIME (ms)
MIC29502/3 Adjust Pin Current
vs. Temperature
MIC2950x
Line Transient
MIC2950x
Line Transient
80
100
50
20
10
0
COUT = 10 µF
COUT = 100 µF
70
60
50
40
30
20
10
0
0
-50
-180.02
-10
-82.02
ILOAD = 10mA
ILOAD = 10mA
6.2
4.2
2.2
6.2
4.2
2.2
ILOAD = 10mA
-60 -30
0
30 60 90 120 150
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
TEMPERATURE (°C)
MIC2950x Output Impedance
vs. Frequency
10
1
0.1
0.01
0.001
FREQUENCY (Hz)
March 2000
11
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Typical Characteristics MIC2975x
MIC2975x Dropout Voltage
MIC2975x Dropout Voltage
vs. Temperature
MIC29750-3.3
Dropout Characteristics
vs. Output Current
450
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
5.0
4.0
3.0
2.0
1.0
0.0
400
350
300
250
200
150
100
50
ILOAD = 10mA
ILOAD = 7.5A
0
0
1
2
3
4
5
6
7
8
-60 -30
0
30 60 90 120 150
0
2
4
6
OUTPUT CURRENT (A)
TEMPERATURE (°C)
INPUT VOLTAGE (V)
MIC2975x Ground Current
vs. Output Current
MIC2975x Ground Current
vs. Supply Voltage
MIC2975x Ground Current
vs. Supply Voltage
120
100
80
60
40
20
0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
175
150
125
100
75
FIXED 3.3V
VERSION
I
OUT = 10mA
50
FIXED 3.3V VERSION
25
ILOAD = 7.5A
0
0
1
2
3
4
5
6
7
8
0
2
4
6
8
10
0
2
4
6
8
OUTPUT CURRENT (A)
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
MIC2975x Ground Current
vs. Temperature
MIC2975x Ground Current
vs. Temperature
MIC2975x Ground Current
vs. Temperature
0.5
0.4
0.3
0.2
0.1
0.0
4
3
2
1
0
200
150
100
50
IOUT = 7.5A
IOUT = 10mA
IOUT = 250mA
0
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC29750-3.3 Output Voltage
vs. Temperature
MIC29750-5.0 Short Circuit
Current vs. Temperature
MIC2975x Ground Current
vs. Input Voltage
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
3.40
12
11
10
9
8
7
6
5
4
3
3.38
3.36
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
VOUT = 0V
RLOAD = 100Ω
3 DEVICES
2
1
0
-60 -30
0
30 60 90 120 150
-60 -30
0
30 60 90 120 150
-30 -20 -10
0
10 20 30
INPUT VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
MIC29150/29300/29500/29750
12
March 2000
MIC29150/29300/29500/29750
Micrel
MIC29751-xx/2 Enable Current
MIC2975x
Load Transient
MIC2975x
Load Transient
vs. Temperaure
30
1500
1000
500
0
300
200
100
0
COUT = 10 µF
COUT = 100 µF
25
20
-100
-1200.0
7.5
VEN = 5V
15
-1500.0
7.5
10
VEN = 2V
5.0
5.0
ILOAD = 10mA
ILOAD = 10mA
2.5
2.5
5
0
0.0
0.0
-2.5
-2.5
-60 -30
0
30 60 90 120 150
-5
0
5
10 15 20 25
-5
0
5
10 15 20 25
TEMPERATURE (°C)
TIME (ms)
TIME (ms)
MIC29752/3 Adjust Pin Current
vs. Temperature
MIC2975x
Line Transient
MIC2975x
Line Transient
80
100
50
30
20
10
0
COUT = 10 µF
COUT = 100 µF
70
60
50
40
30
20
10
0
0
-50
-180.03
-10
-82.03
ILOAD = 10mA
ILOAD = 10mA
6.3
4.3
2.3
6.3
4.3
2.3
ILOAD = 10mA
-60 -30
0
30 60 90 120 150
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
-0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
TIME (ms)
TEMPERATURE (°C)
MIC2975x Output Impedance
vs. Frequency
10
1
0.1
0.01
0.001
FREQUENCY (Hz)
March 2000
13
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
First, we calculate the power dissipation of the regulator from
thesenumbersandthedeviceparametersfromthisdatasheet.
Applications Information
The MIC29150/29300/29500/29750 are high performance
low-dropout voltage regulators suitable for all moderate to
high-current voltage regulator applications. Their 300mV to
400mV 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
P = I
1.01V − V
IN
OUT
D
OUT
Where the ground current is approximated by 1% of I
.
OUT
Then the heat sink thermal resistance is determined with this
formula:
T
− T
A
J MAX
θ
=
− θ + θ
(
)
SA
JC
CS
P
D
Where T
≤ 125°C and θ is between 0 and 2°C/W.
CS
J MAX
V
saturation voltage.
CE
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.
A trade-off for the low dropout voltage is a varying base drive
requirement. But Micrel’s Super ßeta PNP™ process re-
ducesthisdriverequirementtomerely1%oftheloadcurrent.
The MIC29150–29750 family of regulators is fully protected
from damage due to fault conditions. Current limiting is
provided. Thislimitingislinear;outputcurrentunderoverload
conditions is constant. Thermal shutdown disables the de-
vice when the die temperature exceeds the 125°C maximum
safe operating temperature. Transient protection allows de-
vice (and load) survival even when the input voltage spikes
between –20V and +60V. When the input voltage exceeds
about 35V to 40V, the overvoltage sensor temporarily dis-
ables the regulator. The output structure of these regulators
allows voltages in excess of the desired output voltage to be
appliedwithoutreversecurrentflow.MIC29xx1andMIC29xx2
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.
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. MIC29150—29750 regulators are stable
with the following minimum capacitor values at full load:
An additional feature of this regulator family is a common
pinout: a design’s current requirement may change up or
downyetusethesameboardlayout,asalloftheseregulators
have identical pinouts.
Device
Full Load Capacitor
VOUT
VIN
OUT
IN
MIC29150.............................. 10µF
MIC29300.............................. 10µF
MIC29500.............................. 10µF
MIC29750.............................. 22µF
GND
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 ca-
pacitors are recommended for systems where fast load
transient response is important.
Figure 3. Linear regulators require only two capacitors
for operation.
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:
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.
• Maximum ambient temperature, T
A
• Output Current, I
Minimum Load Current
OUT
• Output Voltage, V
The MIC29150–29750 regulators are specified between fi-
nite loads. If the output current is too small, leakage currents
dominate and the output voltage rises. The following mini-
mum load current swamps any expected leakage current
across the operating temperature range:
OUT
• Input Voltage, V
IN
MIC29150/29300/29500/29750
14
March 2000
MIC29150/29300/29500/29750
Micrel
Two resistors are used. Resistors can be quite large, up to
1MΩ, because of the very high input impedance and low bias
current of the sense comparator: The resistor values are
calculated by:
Device
Minimum Load
MIC29150 .................................................... 5mA
MIC29300 .................................................... 7mA
MIC29500 .................................................. 10mA
MIC29750 .................................................. 10mA
V
OUT
R = R
−1
1
2
1.240
Adjustable Regulator Design
Where V is the desired output voltage. Figure 4 shows
O
component definition. Applications with widely varying load
currents may scale the resistors to draw the minimum load
current required for proper operation (see above).
Error Flag
MIC29152BT
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 over-
current fault (the device is in current limit) and low input
voltage. The flag output is inoperative during overtempera-
ture shutdown conditions.
V
V
OUT
IN
R1
R2
10µF
22µF
Enable Input
V
= 1.235V × [1 + (R1 / R2)]
OUT
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 dis-
abled—only microamperes of leakage current flows. The EN
input has TTL/CMOS compatible thresholds for simple inter-
facingwithlogic, ormaybedirectlytiedto≤ 30V. Enablingthe
regulator requires approximately 20µA of current.
Figure 4. Adjustable Regulator with Resistors
Theadjustableregulatorversions, MIC29xx2andMIC29xx3,
allow programming the output voltage anywhere between
1.25V and the 26V maximum operating rating of the family.
March 2000
15
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Package Information
0.151 D ±0.005
(3.84 D ±0.13)
0.176 ±0.005
(4.47 ±0.13)
0.410 ±0.010
(10.41 ±0.25)
0.050 ±0.005
(1.27 ±0.13)
0.108 ±0.005
(2.74 ±0.13)
0.590 ±0.005
(14.99 ±0.13)
7°
0.818 ±0.005
(20.78 ±0.13)
0.356 ±0.005
(9.04 ±0.13)
7°
3°
1.140 ±0.010
(28.96 ±0.25)
0.100 ±0.020
(2.54 ±0.51)
0.050 ±0.003
(1.27 ±.08)
0.030 ±0.003
(0.76 ±0.08)
0.018 ±0.008
(0.46 ±0.020)
0.100 ±0.005
(2.54 ±0.13)
INCH
(MM)
DIMENSIONS:
3-Lead TO-220 (T)
0.405±0.005
0.176 ±0.005
0.050 ±0.005
0.050±0.005
0.065 ±0.010
20°±2°
0.360±0.005
0.600±0.025
SEATING PLANE
+0.004
0.004
–0.008
0.100±0.01
8° MAX
0.015 ±0.002
0.100 BSC
DIM. = INCH
0.050
3-Lead TO-263 (U)
MIC29150/29300/29500/29750
16
March 2000
MIC29150/29300/29500/29750
Micrel
MOUNTING HOLE
0.190 – 0.210
(4.826 – 5.334)
0.125
(3.175)
DIA TYP
0.620 – 0.640
(15.748 – 16.256)
15° TYP
15° TYP
0.180 – 0.200
(4.572 – 5.080)
0.160 – 0.180
(4.064 – 4.572)
0.860 – 0.880
(21.844 – 22.352)
Dimensions:
inch
(mm)
7° TYP
0.250
(6.350)
MAX
0.780 – 0.820
(19.812 – 20.828)
0.070 – 0.090
(1.778 – 2.286)
0.040 – 0.060
(1.016 – 1.524)
0.070 – 0.090
(1.778 – 2.286)
0.025 – 0.035
(0.635 – 0.889)
0.110 – 0.130
(2.794 – 3.302)
0.200
(5.080)
BSC
3-Lead TO-247 (WT)
March 2000
17
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
0.150 D ±0.005
(3.81 D ±0.13)
0.177 ±0.008
(4.50 ±0.20)
0.400 ±0.015
(10.16 ±0.38)
0.050 ±0.005
(1.27 ±0.13)
0.108 ±0.005
(2.74 ±0.13)
0.241 ±0.017
(6.12 ±0.43)
0.578 ±0.018
(14.68 ±0.46)
SEATING
PLANE
7°
Typ.
0.550 ±0.010
(13.97 ±0.25)
0.067 ±0.005
(1.70 ±0.127)
0.032 ±0.005
(0.81 ±0.13)
0.018 ±0.008
(0.46 ±0.20)
0.103 ±0.013
(2.62±0.33)
0.268 REF
(6.81 REF)
inch
(mm)
Dimensions:
5-Lead TO-220 (T)
0.405±0.005
0.176 ±0.005
0.050±0.005
0.065 ±0.010
20°±2°
0.060 ±0.005
0.360±0.005
0.600±0.025
SEATING PLANE
+0.004
0.004
–0.008
0.100±0.01
8° MAX
0.067±0.005
0.032 ±0.003
0.015 ±0.002
DIM. = INCH
5-Lead TO-263 (U)
MIC29150/29300/29500/29750
18
March 2000
MIC29150/29300/29500/29750
Micrel
MOUNTING HOLE
0.185 – 0.208
(4.70 – 5.28)
0.140 – 0.143
(3.56 – 3.63)
DIA TYP
0.620 – 0.640
(15.75 – 16.26)
0.180 – 0.200
(4.57 – 5.08)
0.242 BSC
(6.15 BSC)
0.170 – 0.216
(4.32 – 5.49)
0.819 – 0.844
(20.80 – 21.44)
Dimensions:
inch
(mm)
0.780 – 0.800
(19.81 – 20.32)
0.080 – 0.100
(2.03 – 2.54)
0.040 – 0.055
(1.02 – 1.40)
0.100 BSC
(2.54 BSC)
0.016 – 0.031
(0.41 – 0.79)
5-Lead TO-247 (WT)
March 2000
19
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL + 1 (408) 944-0800 FAX + 1 (408) 944-0970 WEB http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or
other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc.
© 2000 Micrel Incorporated
MIC29150/29300/29500/29750
20
March 2000
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