MIC59300
Ultra High Speed 3A LDO
General Description
The MIC59300 is a high-bandwidth, low-dropout, 3A linear
voltage regulator ideal for powering core voltages of low-
power microprocessors. The MIC59300 implements a dual
supply configuration allowing for a very low output
impedance and a very fast transient response.
The MIC59300 requires a bias input supply and a main
input supply, allowing for ultra-low input voltages on the
main supply rail. The device operates from an input supply
of 1.0V to 3.8V and bias supply between 3V and 5.5V. The
MIC59300 offers
fixed
output voltages and adjustable
output voltages down to 0.5V.
The MIC59300 requires a minimum output capacitance for
stability, working optimally with small ceramic capacitors.
The MIC59300 is available in a 5-pin TO-263 and an 8-pin
EPAD SOIC package and its junction temperature range is
–40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
•
Input voltage range:
– V
IN
= 1.0V to 3.8V
– V
BIAS
= 3.0V to 5.5V
•
Stable with 1µF ceramic capacitor
•
±1% initial tolerance
•
Maximum dropout voltage of 500mV over temperature
•
Adjustable output voltage down to 0.5V
•
Ultra fast transient response
•
Excellent line and load regulation specifications
•
Logic controlled shutdown option
•
Thermal shutdown and current limit protection
•
Junction temperature range: –40°C to +125°C
•
TO-263 & 8-pin EPAD SOIC
•
Pin Compatible Upgrade to MIC49300
Applications
•
•
•
•
•
•
•
Telecommunications processors
Graphics processors
Computer peripheral cards
Logic IC power supply
SMPS post regulators
Microprocessors
Digital TV’s
_________________________________________________________________________________________________________
Typical Application
MIC59300YME
VIN
3, 6
CIN=1µF
(Ceramic)
2
1
VIN
VOUT
4, 5
VOUT
R1
VBIAS
EN
CBIAS=1µF
(Ceramic)
VBIAS
EN
GND
8
9
ADJ
EP
7
COUT=1µF
(Ceramic)
R2
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2009
M9999-010809-A
Micrel, Inc.
MIC59300
Pin Description
Pin Number
SOIC-8
1
2
3, 6
4, 5
7 (adjustable)
7 (fixed)
8
9
3
6
Pin Number
TO-263
1 (fixed)
2
4
5
1 (adjustable)
EN
VBIAS
VIN
VOUT
ADJ
SENSE
GND
EP
Enable (Input): CMOS compatible input. Logic high = enable, logic low
= shutdown.
Input bias voltage for powering all circuitry on the regulator with the
exception of the output power device.
Input voltage needed for the output power device.
Regulator Output.
Adjustable regulator feedback input. Connect to resistor voltage divider.
Connect to VOUT for fixed voltage options.
Ground.
Exposed Pad: Connect to ground pin.
Pin Name
Pin Function
January 2009
3
M9999-010809-A
Micrel, Inc.
MIC59300
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) ........................................ –0.3V to +4V
Bias Supply Voltage (V
BIAS
)............................. –0.3V to +6V
Enable Input Voltage (V
EN
)............................. –0.3V to V
BIAS
Power Dissipation .....................................Internally Limited
Storage Temperature (T
s
) .........................–65°C to +150°C
ESD Rating
(3)
.................................................................. 3kV
Operating Ratings
(2)
Supply Voltage (V
IN
)............................................ 1V to 3.8V
Bias Supply Voltage (V
BIAS
)................................. 3V to 5.5V
Enable Input Voltage (V
EN
).................................. 0V to V
BIAS
Junction Temperature (T
J
) ..................–40°C
≤
T
J
≤
+125°C
Package Thermal Resistance
EPAD SOIC (θ
JA
) ...............................................41°C/W
TO-263 (θ
JC
)………………………………… ......6.3°C/W
Electrical Characteristics
(4)
T
A
= 25°C with V
BIAS
= V
OUT
+ 2.2V; V
IN
= V
OUT
+ 1V; I
LOAD
= 10mA;
bold
values indicate 0°C
≤
T
J
≤
85°C, unless otherwise
specified.
Parameter
Output Voltage Accuracy
(Fixed Voltage Options)
Line Regulation (V
IN
)
Line Regulation (V
BIAS
)
Feedback Voltage
(Adjustable Output Voltage)
Output Voltage Load Regulation
V
IN
– V
OUT
; Dropout Voltage
Condition
Room temperature
Over temperature range
V
IN
= V
OUT
+ 1V to 3.8V
V
BIAS
= 3V to 5.5V (V
OUT
< 0.8V)
V
BIAS
= V
OUT
+ 2.2V to 5.5V (V
OUT
≥
0.8V)
Room temperature
Over temperature range
I
L
= 10mA to 3A (SOIC)
I
L
= 10mA to 3A (TO-263)
I
L
= 1.5A
I
L
= 3A (SOIC)
I
L
= 3A (TO-263)
V
BIAS
– V
OUT
; Dropout Voltage
V
BIAS
supply current
V
BIAS
shutdown current
V
IN
shutdown current
FB bias current
UVLO
Current Limit
Enable Input
Enable Input Threshold
Enable Pin Input Current
AC Response
Large signal bandwidth
PSRR (BIAS) at 10kHz
PSRR (IN) at 10kHz
Thermal Shutdown
V
BIAS
= 3.3V, I
OUT
= 1.5A
V
IN
= V
OUT
+ 1V, I
OUT
= 1.5A
V
IN
= V
OUT
+ 0.3V, I
OUT
= 1.5A
1
45
65
55
145
MHz
dB
dB
dB
°C
Regulator enable
Regulator shutdown
Independent of state
1.6
0.85
0.75
0.002
0.3
1
V
V
µA
I
L
= 3A
V
EN
= 2V, I
L
= 100mA
V
EN
= 2V, I
L
= 3A
V
EN
= 0V
V
EN
= 0V
Adj only
V
BIAS
rising
Hysteresis
V
OUT
= 0V
3.3
2.7
0.495
0.490
Min
1
2
0.0015
0.035
0.5
0.5
0.15
0.15
93
205
205
0.91
2
30
0.1
0.1
0.02
2.85
100
4.7
9.0
Typ
Max
1
2
0.1
0.3
0.505
0.510
0.5
0.5
250
400
500
2.1
7.5
150
1
1
1
3.0
Units
%
%
%/V
%/V
V
V
%
%
mV
mV
mV
V
mA
mA
µA
µA
µA
V
mV
A
January 2009
4
M9999-010809-A
Micrel, Inc.
Thermal Shutdown Hysteresis
Turn-on Time
Notes:
1. 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. Human body model, 1.5kΩ in series with 100pF.
4. Specification for packaged product only.
MIC59300
10
90
300
°C
µs
January 2009
5
M9999-010809-A
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