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 ßeta PNP™ 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
Pin Configuration
1 2 3
1 23 4 5
MIC29150/29300BU
MIC29151/29152/29153BU
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
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
1 2 3
1 23 45
MIC29150/29300/
29500BT and
MIC29750BWT
MIC29151/29152/29153BT
MIC29301/29302/29303BT
MIC29501/29502/29503BT
MIC29751/29752BWT
March 2000
1
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
θ
JC
.............................................................. 2°C/W
TO-263
θ
JC
.............................................................. 2°C/W
TO-247
θ
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
Output Voltage
Condition
I
O
= 10mA
10mA
≤
I
O
≤
I
FL
, (V
OUT
+ 1V)
≤
V
IN
≤
26V (Note 2)
Line Regulation
Load Regulation
∆V
O
∆T
Dropout Voltage
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
26V
V
IN
= V
OUT
+ 5V, 10mA
≤
I
OUT
≤
I
FULL LOAD
(Note 2, 6)
Output Voltage (Note 6)
Temperature Coef.
∆V
OUT
= – 1%, (Note 3)
MIC29150
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
MIC29300
I
O
= 100mA
I
O
= 1.5A
I
O
= 3A
MIC29500
I
O
= 250mA
I
O
= 2.5A
I
O
= 5A
MIC29750
I
O
= 250mA
I
O
= 4A
I
O
= 7.5A
MIC29150
MIC29300
MIC29500
MIC29750
I
GNDDO
Ground Pin
Current at Dropout
I
O
= 750mA, V
IN
= V
OUT
+ 1V
I
O
= 1.5A
I
O
= 1.5A, V
IN
= V
OUT
+ 1V
I
O
= 3A
I
O
= 2.5A, V
IN
= V
OUT
+ 1V
I
O
= 5A
I
O
= 4A, V
IN
= V
OUT
+ 1V
I
O
= 7.5A
Min
–1
–2
0.06
0.2
20
Typ
Max
1
2
0.5
1
100
Units
%
%
%
%
ppm/°C
80
220
350
80
250
370
125
250
370
80
270
425
8
22
10
37
15
70
35
120
0.9
1.7
2.1
3.1
2.1
4.5
7.5
9.5
400
260
200
600
175
600
250
600
200
600
20
35
50
75
mV
Ground Current
mA
mA
mA
mA
Current Limit
e
n
, Output Noise
Voltage
(10Hz to 100kHz)
I
L
= 100mA
Ground Current in Shutdown
V
IN
= 0.5V less than specified V
OUT
. I
OUT
= 10mA
MIC29150
MIC29300
MIC29500
MIC29750
MIC29150
V
OUT
= 0V (Note 4)
MIC29300
V
OUT
= 0V (Note 4)
MIC29500
V
OUT
= 0V (Note 4)
MIC29750
V
OUT
= 0V (Note 4)
C
L
= 10µF
C
L
= 33µF
MIC29150/1/2/3 only
V
EN
= 0.4V
3.5
5.0
10.0
15
mA
mA
mA
mA
A
A
A
A
µV
(rms)
2
10
30
µA
µA
March 2000
3
MIC29150/29300/29500/29750
MIC29150/29300/29500/29750
Notes
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Micrel
Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle (≤1%). The maximum continuous supply
voltage is 26V.
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.
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
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.
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.
Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
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.
V
REF
≤
V
OUT
≤
(V
IN
– 1 V), 2.3V
≤
V
IN
≤
26V, 10mA < I
L
≤
I
FL
, T
J
≤
T
J MAX.
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
IN
O.V.
I
LIMIT
1.180V
FLAG
1.240V
28V
R1*
OUT
Reference
ADJ
†
EN
Thermal
Shut-
down
R2*
GND
* Feedback network in fixed versions only
Adjustable version only
†
Typical Applications
5V
±
5%
MIC29500-3.3
3.3V
±
1% @ 5A
47µF
VIN
R1
VOUT
R2
VOUT = 1.240V
×
[1 + (R1 / R2)]
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.
5
MIC29150/29300/29500/29750
March 2000
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