MIC29510/29512
5A Fast-Response LDO Regulator
General Description
The MIC29510 and MIC29512 are high-current, high-
accuracy, low-dropout voltage regulators featuring fast
transient recovery from input voltage surges and output
load current changes. These regulators use a PNP pass
element that features Micrel’s proprietary Super ßeta
PNP™ process.
The MIC29510/2 is available in two versions: the three pin
fixed output MIC29510 and the five pin adjustable output
voltage MIC29512. All versions are fully protected against
overcurrent faults, reversed input polarity, reversed lead
insertion, overtemperature operation, and positive and
negative transient voltage spikes.
A TTL compatible enable (EN) control pin supports
external on/off control. If on/off control is not required, the
device may be continuously enabled by connecting EN to
IN.
The MIC29510/2 is available in the standard three and five
pin TO-220 package with an operating junction
temperature range of 0°C to +125°C.
For applications requiring even lower dropout voltage,
input voltage greater than 16V, or an error flag, see the
MIC29500/29501/29502/29503.
Features
•
Fast transient response
•
5A current capability
•
700mV dropout voltage at full load
•
Low ground current
•
Accurate 1% guaranteed tolerance
•
“Zero” current shutdown mode (MIC29512)
•
Fixed voltage and adjustable versions
Applications
•
Pentium™, Pentium Plus™ and Power PC™
processor supplies
•
High-efficiency “green” computer systems
•
High-efficiency linear power supplies
•
High-efficiency switching supply post regulator
•
Battery-powered equipment
Typical Application
Fixed Regulator Configuration
Adjustable Regulator Configuration
Super ßeta PNP is a trademarks 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
May 2006
M9999-051706
(408) 955-1690
Micrel, Inc.
MIC29510/29512
Ordering Information
Part Number
Standard
MIC29510-3.3BT
MIC29510-5.0BT
MIC29512BT
RoHS Compliant*
MIC29510-3.3WT
MIC29510-5.0WT
MIC29512WT
0ºC to +125ºC
0ºC to +125ºC
0ºC to +125ºC
3.3V
5.0V
Adj.
5A
5A
5A
TO-220-3
TO-220-3
TO-220-5
Junction Temp. Range
Voltage
Current
Package
* RoHS compliant with ‘high-melting solder’ exemption.
Pin Configuration
1 2 3
MIC29510BT/WT
On all devices, the Tab is grounded
1234 5
MIC29512BT/WT
Pin Description
3-Pin TO-220 (MIC29510)
Pin
Number
1
2
3
Pin
Name
IN
GND
OUT
Pin Function
Unregulated Input: +16V maximum supply.
Ground: Internally connected to tab (ground).
Regulated Output.
5-Pin TO-220 (MIC29512)
Pin
Number
1
2
3
4
5
Pin
Name
EN
IN
GND
OUT
ADJ
Pin Function
Enable (Input): Logic-level ON/OFF control.
Unregulated Input: +16V maximum supply.
Ground: Internally connected to tab (ground).
Regulated Output.
Output Voltage Adjust: 1.240V feedback from external resistive divider.
May 2006
2
M9999-051706
(408) 955-1690
Micrel, Inc.
MIC29510/29512
Absolute Maximum Ratings
Input Supply Voltage
(1)
................................... –20V to +20V
Power Dissipation .....................................Internally Limited
Storage Temperature Range ....................–65°C to +150°C
Ambient Temperature Range (soldering, 5 sec.) ....... 260°C
Operating Ratings
Operating Junction Temperature ...................0ºC to +125ºC
(θ
JC
) (TO-220) ............................................................2°C/W
(θ
JA
) (TO-220)...........................................................55°C/W
Electrical Characteristics
All measurements at T
J
= 25°C unless otherwise noted.
Bold
values are guaranteed across the operating temperature range.
Parameter
Conditions
Min
Typ
Max
10mA
≤
I
O
≤
I
FL
, (V
OUT
+ 1V)
≤
V
IN
≤
8V (Note
2)
–2
2
Output Voltage
Line Regulation
Load Regulation
∆V
O
/∆T
Dropout Voltage
I
O
= 10mA, (V
OUT
+ 1V)
≤
V
IN
≤
8V
V
IN
= V
OUT
+ 1V, 10mA
≤
I
OUT
≤
I
FULL LOAD
(Notes
2, 6))
Output Voltage Temperature Coefficient (Note
6)
∆V
OUT
= – 1% (Note
3)
MIC29510/29512
I
O
= 100mA
I
O
= 750mA
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
MIC29510/29512
I
O
= 750mA, V
IN
= V
OUT
+ 1V
I
O
= 1.5A
I
O
= 3A
I
O
= 5A
5.0
0.06
0.2
20
80
200
320
500
700
3
10
36
100
2
6.5
260
0.5
1
100
200
Units
%
%
%
ppm/ºC
mV
mV
mV
mV
mV
mA
mA
mA
mA
mA
A
µV
RMS
1000
20
Ground Current
150
3
I
GNDDO
Ground Pin Current at Dropout
Current Limit
e
n
, Output Noise Voltage
(10Hz to 100kHz) I
L
= 100mA
V
IN
= 0.5V less than specified V
OUT
. I
OUT
= 10mA
MIC29510/29512 V
OUT
= 0V (Note
4)
C
L
= 47µF
Reference (MIC29512 only)
Parameter
Reference Voltage
Adjust Pin Bias Current
Reference Voltage Temperature
Coefficient
Adjust Pin Bias Current Temperature
Coefficient
(Note
7)
Conditions
10mA
≤
I
O
≤
I
FL
, V
OUT
+ 1V
≤
V
IN
≤
8V (Note
2)
Min
1.215
40
20
0.1
Typ
Max
1.265
80
120
Units
V
MAX
nA
nA
ppm/ºC
nA/ºC
May 2006
3
M9999-051706
(408) 955-1690
Micrel, Inc.
MIC29510/29512
Enable Input (MIC29512 only)
Parameter
Input Logic Voltage
Enable (EN) Pin Input Current
Conditions
Low (Off)
High (On)
V
EN
= V
IN
V
EN
= 0.8V
Regulator Output Current in Shutdown
(Note
8)
Min
2.4
15
–
10
20
30
75
2
4
Typ
Max
0.8
Units
V
V
µA
µA
µA
µA
µA
µA
Notes:
General Note: Devices are ESD sensitive. Handling precautions are recommended.
1. The maximum continuous supply voltage is 16V.
2. Full Load current is defined as 5A for the MIC29510/29512. For testing, V
OUT
is programmed to 5V.
3. Dropout voltage 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
.
4. For this test, V
IN
is the larger of 8V or V
OUT
+ 3V.
5. Ground pin current is regulator quiescent current. Total current drawn from the source is the sum of the load current plus the ground pin current.
6. Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
7. V
REF
≤
V
OUT
≤
(V
IN
– 1V), 2.4V
≤
V
IN
≤
16V, 10mA < I
L
≤
I
FL
, T
J
≤
T
J MAX
.
8. V
EN
≤
0.8V and V
IN
≤
8V, V
OUT
= 0.
Block Diagram
16V
May 2006
4
M9999-051706
(408) 955-1690
嵌入式系统
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