MIC38300
3A SuperLNR™
Low Noise High Efficiency Regulator
ADVANCED INFORMATION
General Description
Features
The MIC38300 is a 3A peak, 2.2A continuous output
•
3A peak output current
current step down converter and the first device in a new
•
2.2A continuous operating current
generation of SuperLNR™ providing the benefits of LDOs
•
Input voltage range: 3.0V to 5.5V
in respect to ease of use, fast transient performance, high
•
Adjustable output voltage down to 1.0V
PSRR and low noise while offering the efficiency of a
•
Output noise less than 5mV
switching regulator.
•
Ultra fast transient performance
As output voltages move lower, the output noise and
transient response of a switching regulator become an
•
Unique switcher plus LDO architecture
increasing challenge for designers. By combining a
•
Fully integrated MOSFET switches
switcher whose output is slaved to the input of a high
•
Micro-power shutdown
performance LDO, high efficiency is achieved with a clean
•
Easy upgrade from LDO as power dissipation
low noise output. The MIC38300 is designed to provide
becomes an issue
less than 5mV of peak to peak noise and over 70dB of
PSRR at 1kHz. Furthermore, the architecture of the
•
Thermal shutdown and current limit protection
MIC38300 is optimized for fast load transients allowing to
•
4mm × 6mm × 0.9mm MLF
®
package
maintain less than 30mV of output voltage deviation even
during ultra fast load steps, making the MIC38300 an ideal
Applications
choice for low voltage ASICs and other digital ICs.
The MIC38300 features a fully integrated switching
•
Point-of-load applications
regulator and LDO combo, operates with input voltages
•
Networking, server, industrial power
from 3.0V to 5.5V input and offers adjustable output
•
Wireless base-stations
voltages down to 1.0V.
•
Sensitive RF applications
The MIC38300 is offered in the small 28-pin 4×6×0.9mm
®
MLF package and can operate from –40°C to +125°C.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com
___________________________________________________________________________________________________________
Typical Application
MIC38300 PSRR
90
80
70
60
50
40
30
20
10
0
10
100
1k
10k
FREQUENCY (Hz)
100k
SuperLNR is a trademark of Micrel, Inc.
MLF and
MicroLeadFrame
are registered trademark of Amkor Technologies
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
408
) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
July 2007
M9999-070607
(408) 944-0800
Micrel, Inc.
MIC38300
Block Diagram
PVIN
Switch Control
AVIN
SW
SWO
PGND
LPF
LDOIN
VREF
Voltage
Reference
VEN
LDOOUT
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.
July 2007
2
M9999-070607
(408) 944-0800
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
PVIN
LDOIN
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: Floating for typical applications. Attach external resistor from
LPF to increase hysteretic frequency.
Exposed heat-sink pad. Recommend to connect to PGND.
Analog Supply Voltage: Supply for the analog control circuitry. Requires
bypass capacitor to ground.
Low Pass Filter: Floating for typical applications. 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): 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.
Input Supply Voltage (Input): Requires bypass capacitor to GND.
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.
Power Ground.
19, 20, 21
PGND
Note:
Prefix
H
indicates V
OUT
>1V, prefix
L
indicates V
OUT
is between 0.7V to 1V.
July 2007
3
LDOIN
PVIN
M9999-070607
(408) 944-0800
Micrel, Inc.
MIC38300
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ...........................................6V
Output Switch Current (I
SW
) .............................................8A
LDO Output Voltage (V
OUT
) .............................................6V
Logic Input Voltage (V
EN
, V
LQ
)..........................VIN to –0.3V
Power Dissipation .................................. Internally Limited
(3)
Storage Temperature (T
S
)...................–65°C
≤
T
J
≤
+150°C
ESD Rating
(4)
................................................................. 2kV
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
) .............................40°C/W
Electrical Characteristics
(5)
T
A
= 25°C with V
IN
= V
EN
= 5V; V
EN
= V
IN
; 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
LDO Quiescent Current
Turn-on Time
Shutdown Current
Feedback Voltage
Feedback Current
V
IN
– V
O
; Dropout Voltage
Current Limit
Output Voltage Load Regulation
Output Voltage Line Regulation
Output Ripple
Over-Temperature Shutdown
Over-Temperature Shutdown
Hysteresis
Enable Input
Enable Input Threshold
Enable Hysteresis
Enable Input Current
Notes:
1.
2.
3.
4.
5.
Conditions
Turn-on
I
OUT
= 0A,
V
OUT
to 5% of regulation, I I
LOAD
= 3A
V
EN
= 0V
±1%
±2.5%
I
LOAD
= 3.0A
V
FB
= 0.9×V
NOM
V
OUT
= 1.8V, 10mA to 3A
V
OUT
= 1.8V, V
IN
from 3.0V to 5.5V
I
LOAD
= 2A, C
OUTLDO
= 20µF, C
OUTSW
= 20µF
LPF=25kΩ
Min
3.0
Typ
2.75
100
1
200
35
Max
5.5
Units
V
V
mV
mA
350
50
1.01
1.025
1
1.2
µs
µA
V
V
µA
V
A
%
%/V
mV
°C
°C
0.99
0.975
1
1
4.5
6
0.3
0.35
5
150
20
1
0.5
Regulator enable
0.90
20
1
120
0.01
1.1
200
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.
July 2007
4
M9999-070607
(408) 944-0800
Micrel, Inc.
MIC38300
Typical Characteristics
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
0
1
2
3
4
INPUT VOLTAGE (V)
5
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
0.6
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)
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
Enable Threshold
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
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
3.0
Current Limit
vs. Input Voltage
V
OUT
= 1.8V
C
OUT
= 10µF
3.5
4.0
4.5
5.0
INPUT VOLTAGE (V)
5.5
July 2007
5
M9999-070607
(408) 944-0800
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