March 2000
1
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
MIC29150/29300/29500/29750 Series
High-Current Low-Dropout Regulators
General Description
The MIC29150/29300/29500/29750 are high current, high
accuracy, low-dropout voltage regulators. Using Micrel's
proprietary Super eta PNPTM process with a PNP pass
element, these regulators feature 300mV to 370mV (full load)
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.
The MIC29150/29300/29500/29750 are fully protected against
overcurrent faults, reversed input polarity, reversed lead
insertion, overtemperature operation, and positive and nega-
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.
On the MIC29xx1 and MIC29xx2, the ENABLE pin may be
tied to V
IN
if it is not required for ON/OFF control. The
MIC29150/29300/29500 are available in 3- and 5-pin TO-220
and surface mount TO-263 packages. The MIC29750 7.5A
regulators are available in 3- and 5-pin TO-247 packages.
Features
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
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
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
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
1 2 3
1 2 3 4 5
MIC29151/29152/29153BT
MIC29301/29302/29303BT
MIC29501/29502/29503BT
MIC29751/29752BWT
MIC29150/29300/
29500BT and
MIC29750BWT
Pin Configuration
1 2 3
MIC29150/29300BU
MIC29151/29152/29153BU
MIC29301/29302/29303BU
MIC29501/29502/29503BU
1 2 3 4 5
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
MIC29150/29300/29500/29750
Micrel
MIC29150/29300/29500/29750
2
March 2000
Part Number
Temp. Range* Volts Current Package
MIC29500-3.3BT
40 to +125
C
3.3
5.0A
TO-220
MIC29500-5.0BT
40 to +125
C
5.0
5.0A
TO-220
MIC29501-3.3BT
40 to +125
C
3.3
5.0A
TO-220-5
MIC29501-5.0BT
40 to +125
C
5.0
5.0A
TO-220-5
MIC29501-3.3BU
40 to +125
C
3.3
5.0A
TO-263-5
MIC29501-5.0BU
40 to +125
C
5.0
5.0A
TO-263-5
MIC29502BT
40 to +125
C
Adj
5.0A
TO-220-5
MIC29502BU
40 to +125
C
Adj
5.0A
TO-263-5
MIC29503BT
40 to +125
C
Adj
5.0A
TO-220-5
MIC29503BU
40 to +125
C
Adj
5.0A
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
MIC29752BWT
40 to +125
C
Adj
7.5A
TO-247-5
Ordering Information
Part Number
Temp. Range* Volts Current Package
MIC29150-3.3BT
40 to +125
C
3.3
1.5A
TO-220
MIC29150-4.2BT
40 to +125
C
4.2
1.5A
TO-220
MIC29150-5.0BT
40 to +125
C
5.0
1.5A
TO-220
MIC29150-12BT
40 to +125
C
12
1.5A
TO-220
MIC29150-3.3BU
40 to +125
C
3.3
1.5A
TO-263
MIC29150-5.0BU
40 to +125
C
5.0
1.5A
TO-263
MIC29150-12BU
40 to +125
C
12
1.5A
TO-263
MIC29151-3.3BT
40 to +125
C
3.3
1.5A
TO-220-5
MIC29151-5.0BT
40 to +125
C
5.0
1.5A
TO-220-5
MIC29151-12BT
40 to +125
C
12
1.5A
TO-220-5
MIC29151-3.3BU
40 to +125
C
3.3
1.5A
TO-263-5
MIC29151-5.0BU
40 to +125
C
5.0
1.5A
TO-263-5
MIC29151-12BU
40 to +125
C
12
1.5A
TO-263-5
MIC29152BT
40 to +125
C
Adj
1.5A
TO-220-5
MIC29152BU
40 to +125
C
Adj
1.5A
TO-263-5
MIC29153BT
40 to +125
C
Adj
1.5A
TO-220-5
MIC29153BU
40 to +125
C
Adj
1.5A
TO-263-5
MIC29300-3.3BT
40 to +125
C
3.3
3.0A
TO-220
MIC29300-5.0BT
40 to +125
C
5.0
3.0A
TO-220
MIC29300-12BT
40 to +125
C
12
3.0A
TO-220
MIC29300-3.3BU
40 to +125
C
3.3
3.0A
TO-263
MIC29300-5.0BU
40 to +125
C
5.0
3.0A
TO-263
MIC29300-12BU
40 to +125
C
12
3.0A
TO-263
MIC29301-3.3BT
40 to +125
C
3.3
3.0A
TO-220-5
MIC29301-5.0BT
40 to +125
C
5.0
3.0A
TO-220-5
MIC29301-12BT
40 to +125
C
12
3.0A
TO-220-5
MIC29301-3.3BU
40 to +125
C
3.3
3.0A
TO-263-5
MIC29301-5.0BU
40 to +125
C
5.0
3.0A
TO-263-5
MIC29301-12BU
40 to +125
C
12
3.0A
TO-263-5
MIC29302BT
40 to +125
C
Adj
3.0A
TO-220-5
MIC29302BU
40 to +125
C
Adj
3.0A
TO-263-5
MIC29303BT
40 to +125
C
Adj
3.0A
TO-220-5
MIC29303BU
40 to +125
C
Adj
3.0A
TO-263-5
MIC29xx0 versions are 3-terminal fixed voltage devices.
MIC29xx1 are fixed voltage devices with ENABLE and ERROR
flag. MIC29xx2 are adjustable regulators with ENABLE control.
MIC29xx3 are adjustables with an ERROR flag.
* Junction Temperature
March 2000
3
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Micrel
Absolute Maximum 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 Ratings
Operating Junction Temperature ............. 40
C to +125
C
Maximum Operating Input Voltage ............................... 26V
TO-220
JC
.............................................................. 2
C/W
TO-263
JC
.............................................................. 2
C/W
TO-247
JC
........................................................... 1.5
C/W
Electrical Characteristics
All measurements at T
J
= 25
C unless otherwise noted. Bold values are guaranteed across the operating temperature range.
Adjustable versions are programmed to 5.0V.
Parameter
Condition
Min
Typ
Max
Units
Output Voltage
I
O
= 10mA
1
1
%
10mA
I
O
I
FL
, (V
OUT
+ 1V)
V
IN
26V (Note 2)
2
2
%
Line Regulation
I
O
= 10mA, (V
OUT
+ 1V)
V
IN
26V
0.06
0.5
%
Load Regulation
V
IN
= V
OUT
+ 5V, 10mA
I
OUT
I
FULL LOAD
(Note 2, 6)
0.2
1
%
V
O
Output Voltage (Note 6)
20
100
ppm/
C
T
Temperature Coef.
Dropout Voltage
V
OUT
= 1%, (Note 3)
MIC29150
I
O
= 100mA
80
200
mV
I
O
= 750mA
220
I
O
= 1.5A
350
600
MIC29300
I
O
= 100mA
80
175
I
O
= 1.5A
250
I
O
= 3A
370
600
MIC29500
I
O
= 250mA
125
250
I
O
= 2.5A
250
I
O
= 5A
370
600
MIC29750
I
O
= 250mA
80
200
I
O
= 4A
270
I
O
= 7.5A
425
600
Ground Current
MIC29150
I
O
= 750mA, V
IN
= V
OUT
+ 1V
8
20
mA
I
O
= 1.5A
22
MIC29300
I
O
= 1.5A, V
IN
= V
OUT
+ 1V
10
35
mA
I
O
= 3A
37
MIC29500
I
O
= 2.5A, V
IN
= V
OUT
+ 1V
15
50
mA
I
O
= 5A
70
MIC29750
I
O
= 4A, V
IN
= V
OUT
+ 1V
35
75
mA
I
O
= 7.5A
120
I
GNDDO
Ground Pin
V
IN
= 0.5V less than specified V
OUT
. I
OUT
= 10mA
Current at Dropout
MIC29150
0.9
mA
MIC29300
1.7
mA
MIC29500
2.1
mA
MIC29750
3.1
mA
Current Limit
MIC29150
V
OUT
= 0V (Note 4)
2.1
3.5
A
MIC29300
V
OUT
= 0V (Note 4)
4.5
5.0
A
MIC29500
V
OUT
= 0V (Note 4)
7.5
10.0
A
MIC29750
V
OUT
= 0V (Note 4)
9.5
15
A
e
n
, Output Noise
C
L
= 10
F
400
V (rms)
Voltage
(10Hz to 100kHz)
C
L
= 33
F
260
I
L
= 100mA
Ground Current in Shutdown
MIC29150/1/2/3 only
V
EN
= 0.4V
2
10
A
30
A
MIC29150/29300/29500/29750
Micrel
MIC29150/29300/29500/29750
4
March 2000
Electrical Characteristics
(Continued)
Reference
MIC29xx2/MIC29xx3
Parameter
Conditions
Min
Typical
Max
Units
Reference Voltage
1.228
1.240
1.252
V
1.215
1.265
V max
Reference Voltage
(Note 8)
1.203
1.277
V
Adjust Pin
40
80
nA
Bias Current
120
Reference Voltage
(Note 7)
20
ppm/
C
Temperature
Coefficient
Adjust Pin Bias
0.1
nA/
C
Current Temperature
Coefficient
Flag Output (Error Comparator)
MIC29xx1/29xx3
Output Leakage
V
OH
= 26V
0.01
1.00
A
Current
2.00
Output Low
Device set for 5V. V
IN
= 4.5V
220
300
mV
Voltage
I
OL
= 250
A
400
Upper Threshold
Device set for 5V (Note 9)
40
60
mV
Voltage
25
Lower Threshold
Device set for 5V (Note 9)
75
95
mV
Voltage
140
Hysteresis
Device set for 5V (Note 9)
15
mV
ENABLE Input
Input Logic Voltage
V
Low (OFF)
0.8
High (ON)
2.4
Enable Pin
V
EN
= 26V
100
600
A
Input Current
750
V
EN
=0.8V
1
A
2
Regulator Output
(Note 10)
10
A
Current in Shutdown
500
MIC29xx1/MIC29xx2
March 2000
5
MIC29150/29300/29500/29750
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
FL
) is defined as 1.5A for the MIC29150, 3A for the MIC29300, 5A for the MIC29500, and 7.5A for the MIC29750 families.
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
OUT
+ 1V applied
to V
IN
Note 4:
V
IN
= V
OUT (nominal)
+ 1V. For example, use V
IN
= 4.3V for a 3.3V regulator or use 6V for a 5V regulator. Employ pulse-testing procedures to
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
IN
= 20V (a 4W pulse) for T = 10ms.
Note 8:
V
REF
V
OUT
(V
IN
1 V), 2.3V
V
IN
26V, 10mA < I
L
I
FL
, T
J
T
J MAX.
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
OUT
/V
REF
= (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 95 mV x 5V/1.240 V = 384
mV. Thresholds remain constant as a percent of V
OUT
as V
OUT
is varied, with the dropout warning occurring at typically 5% below nominal,
7.7% guaranteed.
Note 10: V
EN
0.8V and V
IN
26V, V
OUT
= 0.
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
Reference
28V
O.V.
I
LIMIT
Thermal
Shut-
down
1.240V
1.180V
EN
IN
FLAG
GND
OUT
ADJ
R1*
R2*
* Feedback network in fixed versions only
Adjustable version only
Typical Applications
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.
MIC29500-3.3
5V
5%
47F
3.3V
1% @ 5A
R1
R2
VOUT = 1.240V
[1 + (R1 / R2)]
VIN
VOUT
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