MIC38300
HELDO™
3A High Efficiency Low Dropout
Regulator
General Description
HELDO™
The MIC38300 is a 3A peak, 2.2A continuous output
current step down converter. This is the first device in a
Features
new generation of HELDO™ (High Efficiency Low
•
3A peak output current
Dropout) regulators that provide the benefits of an LDO in
•
2.2A continuous operating current
respect to ease of use, fast transient performance, high
PSRR and low noise while offering the efficiency of a
•
Input voltage range: 3.0V to 5.5V
switching regulator.
•
Adjustable output voltage down to 1.0V
As output voltages move lower, the output noise and
•
Output noise less than 5mV
transient response of a switching regulator become an
•
Ultra fast transient performance
increasing challenge for designers. By combining a
•
Unique switcher plus LDO architecture
switcher whose output is slaved to the input of a high
performance LDO, high efficiency is achieved with a clean
•
Fully integrated MOSFET switches
low noise output. The MIC38300 is designed to provide
•
Micro-power shutdown
less than 5mV of peak to peak noise and over 70dB of
•
Easy upgrade from LDO as power dissipation
PSRR at 1kHz. Furthermore, the architecture of the
becomes an issue
MIC38300 is optimized for fast load transients that allow a
•
Thermal shutdown and current limit protection
maintenance of less than 30mV of output voltage deviation
®
even during ultra fast load steps, making the MIC38300 an
•
4mm × 6mm × 0.9mm MLF package
ideal choice for low voltage ASICs and other digital ICs.
The MIC38300 features a fully integrated switching
Applications
regulator and LDO combo, operates with input voltages
•
Point-of-load applications
from 3.0V to 5.5V input and offers adjustable output
voltages down to 1.0V.
•
Networking, server, industrial power
The MIC38300 is offered in the small 28-pin 4×6×0.9mm
•
Wireless base-stations
®
MLF package and can operate from –40°C to +125°C.
•
Sensitive RF applications
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com
___________________________________________________________________________________________________________
Typical Application
HELDO is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademark of Amkor Technology.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
June 2010
M9999-061010-D
Micrel, Inc.
MIC38300
Block Diagram
PVIN
Switch Control
AVIN
SW
SWO
PGND
LPF
LDOIN
VREF
Voltage
Reference
VEN-VREF
+
-
VOUT
FB
+
-
EN
AGND
MIC38300
Ordering Information
Part Number
MIC38300HYHL
Output
Current
3.0A
Voltage
ADJ
(1)
Junction
Temperature Range
–40°C to +125°C
Package
PB-Free 28-Pin 4x6 MLF
®
Note:
For additional voltage options, contact Micrel.
June 2010
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M9999-061010-D
Micrel, Inc.
MIC38300
Pin Configuration
SWO
1
SWO
2
SWO
3
SWO
4
SWO
5
SW
ePAD
AVIN
LPF
6
7
8
9
28
SW
27
SW
26
SW
25
SW
24
SW
23
SW
22
ePAD
21
PGND
20
PGND
19
PGND
18
EN
12
13
14
15
16
17
AGND
10
FB
11
LDOOUT
LDOOUT
LDOIN
LDOIN
PVIN
28-Pin 4mm x 6mm MLF (ML)
(Top View)
Pin Description
Pin Number
MIC38300HYHL
1, 2, 3, 4, 5
6, 23, 24, 25,
26, 27, 28
7, 22
8
9
10
11
12, 13
14, 15
16, 17
18
Pin Name
SWO
SW
ePAD
AVIN
LPF
AGND
FB
LDOOUT
LDOIN
PVIN
EN
Pin Name
Switch (Output): This is the output of the PFM Switcher.
Switch Node: Attach external resistor from LPF to increase hysteretic
frequency.
Exposed heat-sink pad. Connect externally to PGND.
Analog Supply Voltage: Supply for the analog control circuitry. Requires
bypass capacitor to ground. Nominal bypass capacitor is 1µF.
Low Pass Filter: Attach external resistor from SW to increase hysteretic
frequency.
Analog Ground.
Feedback: Input to the error amplifier. Connect to the external resistor
divider network to set the output voltage.
LDO Output: Output of voltage regulator. Place capacitor to ground to
bypass the output voltage. Nominal bypass capacitor is 10µF.
LDO Input: Connect to SW output. Requires a bypass capacitor to ground.
Nominal bypass capacitor is 10µF.
Input Supply Voltage (Input): Requires bypass capacitor to GND. Nominal
bypass capacitor is 10µF.
Enable (Input): Logic low will shut down the device, reducing the quiescent
current to less than 50µA. This pin can also be used as an under-voltage
lockout function by connecting a resistor divider from EN/UVLO pin to VIN
and GND. It should be not left open.
Power Ground.
19, 20, 21
PGND
June 2010
3
PVIN
®
M9999-061010-D
Micrel, Inc.
MIC38300
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ...........................................6V
LDO Output Voltage (V
OUT
) .............................................6V
Logic Input Voltage (V
EN
) .................................–0.3V to VIN
(3)
Power Dissipation .................................. Internally Limited
Storage Temperature (T
S
)...................–65°C
≤
T
J
≤
+150°C
(4)
ESD Rating .............................................................. 1.5kV
Operating Ratings
(2)
Supply voltage (V
IN
) ...................................... 3.0V to 5.5V
Junction Temperature Range .........–40°C
≤
T
J
≤
+125°C
Enable Input Voltage (V
EN
) ................................. 0V to V
IN
Package Thermal Resistance
4mm × 6mm MLF-28 (θ
JA
) .............................24°C/W
Electrical Characteristics
(5)
T
A
= 25°C with V
IN
= V
EN
= 5V; I
OUT
= 10mA, V
OUT
= 1.8V.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Parameter
Supply Voltage Range
Under-Voltage Lockout Threshold
UVLO Hysteresis
Quiescent Current
Turn-on Time
Shutdown Current
Feedback Voltage
Feedback Current
Dropout Voltage (V
IN
– V
OUT
)
Current Limit
Output Voltage Load Regulation
Output Voltage Line Regulation
Output Ripple
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
Enable Input
(6)
Conditions
Turn-on
I
OUT
= 0A, Not switching, Open Loop
V
OUT
to 95% of nominal
V
EN
= 0V
±2.5%
I
LOAD
= 2.2A; V
OUT
= 3V
V
FB
= 0.9×V
NOM
V
OUT
= 1.8V, 10mA to 2.2A
V
OUT
= 1.8V, V
IN
from 3.0V to 5.5V
I
LOAD
= 1.5A, C
OUTLDO
= 20µF, C
OUTSW
= 20µF
LPF=25kΩ
Min
3.0
Typ
2.85
100
1
200
30
Max
5.5
Units
V
V
mV
mA
500
50
1.025
1.2
1
0.5
µs
µA
V
nA
V
A
%
%/V
mV
°C
°C
0.975
1
5
0.85
3
5
0.3
0.35
2
150
15
Enable Input Threshold
Enable Hysteresis
Enable Input Current
Notes:
1.
2.
3.
4.
5.
6.
Regulator enable
0.90
20
1
100
0.03
1.1
200
1
V
mV
µA
Exceeding the absolute maximum rating may damage the device.
The device is not guaranteed to function outside its operating rating.
The maximum allowable power dissipation of any T
A
(ambient temperature) is P
D(max)
= (T
J(max)
– T
A
) /
θ
JA
. Exceeding the maximum allowable power
dissipation will result in excessive die temperature, and the regulator will go into thermal shutdown.
Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF.
Specification for packaged product only.
Enable pin should not be left open.
June 2010
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M9999-061010-D
Micrel, Inc.
MIC38300
Typical Characteristics
V
IN
= 3.3V, V
OUT
= 1.8V, C
OUT
= 10µF, R
LPF
= 25kΩ, I
OUT
= 100mA, unless noted
MIC38300 PSRR
90
80
70
60
50
40
30
20
10
0
10
100
1k
10k
FREQUENCY (Hz)
100k
1.820
1.815
1.810
1.805
1.800
1.795
1.790
1.785
1.780
0
V
IN
= 3.3V
V
OUT
= 1.8V
C
OUT
= 10µF
0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (A)
3.0
Load Regulation
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
Output Voltage
vs. Input Voltage
10mA
2A
0.4 V
OUT
= 1.8V
0.2 C
OUT
= 10µF
0
012345
INPUT VOLTAGE (V)
1.88
1.86
1.84
1.82
1.80
1.78
1.76
1.74
1.72
Output Voltage
vs. Temperature
Thermal Shutdown
2.0
1.8
1.6
1.4
1.2
1.0
0.8
90
80
70
60
50
40
30
20
10
0
0
MIC38300 Efficiency
V
IN
= 3.3V
C
OUT
= 10µF
I
OUT
= 10mA
20 40 60 80
TEMPERATURE (°C)
0.6
V = 3.3V
0.4
IN
V
OUT
= 1.8V
0.2 C
OUT
= 10µF
0
-40
10
60
110 160
TEMPERATURE (°C)
V
IN
= 5V
V
OUT
= 3.3V
C
OUT
= 10µF
0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (A)
3.0
210
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
Dropout Voltage
vs. Load Current
1.0
0.9
0.8
0.7
0.6
Dropout Voltage
vs. Temperature
5.5
5.3
5.1
4.9
4.7
4.5
4.3
4.1
Current Limit
vs. Input Voltage
2A
1A
V
IN
= 3.3V
C
OUT
= 20µF
R
LPF
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
0.5
0.4
V
OUT
= 4V
C
OUT
= 20µF
20 40 60 80
TEMPERATURE (°C)
V
OUT
= 1V
C
OUT
= 20µF
3.7
R
LPF
3.5
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
INPUT VOLTAGE (V)
3.9
Enable Threshold
OPERATING CURRENT (mA)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
3.0
V
OUT
= 1.8V
C
OUT
= 10µF
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
5.5
60
50
40
30
20
10
0
3
Operating Current
vs. Input Voltage
V
OUT
= 1.8V
C
OUT
= 10µF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
June 2010
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M9999-061010-D
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