MIC38150
HELDO
®
1.5A High Efficiency Low Dropout
Regulator
General Description
HELDO
The MIC38150 is a 1.5A continuous output current step
down converter. This is a follow on product in the new
®
Features
HELDO (High Efficiency Low DropOut Regulators) family,
that provide the benefits of an LDO with respect to ease of
•
Output current up to 1.5A
use, fast transient performance, high PSRR and low noise
•
Input voltage range: 3.0V to 5.5V
while offering the efficiency of a 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
switcher whose output is slaved to the input of a high
•
Unique switcher plus LDO architecture
performance LDO, high efficiency is achieved with a clean
•
Fully integrated MOSFET switches
low noise output. The MIC38150 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
MIC38150 is optimized for fast load transients allowing the
output to maintain less than 30mV of output voltage
•
Thermal shutdown and current limit protection
®
deviation even during ultra fast load steps. This makes the
•
4mm × 6mm × 0.9mm MLF package
MIC38150 an ideal choice for low voltage ASICs and other
digital ICs.
Applications
The MIC38150 features a fully integrated switching
regulator and LDO combination, operates with input
•
Point-of-load applications
voltages from 3.0V to 5.5V input and offers adjustable
•
Networking, server, industrial power
output voltages down to 1.0V.
•
Wireless base-stations
The MIC38150 is offered in the small 28-pin 4mm × 6mm
•
Sensitive RF applications
®
× 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
HELDO is a registered 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
June 2010
LOAD CURRENT
(1A/div)
OUTPUT VOLTAGE
(50mV/div)
M9999-061010-C
Micrel, Inc.
MIC38150
Ordering Information
Part Number
MIC38150HYHL
Output
Current
1.5A
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.
Pin Configuration
28-Pin 4mm x 6mm MLF (ML)
(Top View)
®
Pin Description
Pin Number
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 pin-to-VIN and
GND. It should be not left open.
Power Ground.
19, 20, 21
PGND
June 2010
2
M9999-061010-C
Micrel, Inc.
MIC38150
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
) .........................................................6V
Output Switch Voltage (V
SW
) ...........................................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
Lead Temperature (soldering, 10sec) ........................ 260°C
(4)
ESD Rating .............................................................. 1.5kV
Operating Ratings
(2)
Supply voltage (V
IN
) ...................................... 3.0V to 5.5V
Enable Input Voltage (V
EN
) ................................. 0V to V
IN
Junction Temperature Range .........–40°C
≤
T
J
≤
+125°C
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
= 1.5A; V
OUT
= 3V
V
FB
= 0.9×V
NOM
V
OUT
= 1.8V, 10mA to 1.5A
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
1.75
3
0.1
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
3
M9999-061010-C
Micrel, Inc.
MIC38150
Typical Characteristics
V
IN
= 3.3V, V
OUT
= 1.8V, C
OUT
= 10µF, R
LPF
= 25kΩ, I
OUT
= 100mA, unless noted
MIC38150 PSRR
90
80
Load Regulation
1.88
1.86
O UTPUT VO LTAG E (V)
1.84
1.82
1.80
1.78
1.76
1.74
1.72
OUTPUT VOLTAGE (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
1
Output Voltage
vs. Input Voltage
I
OUT
= 10mA
70
60
PSRR (dB)
50
40
30
20
10
0
10
100
1000
10000
FREQUENCY (Hz)
100000
I
OUT
= 1.5A
V
IN
= 3.3V
V
OUT
= 1.8V
0
0.3
0.6
0.9
1.2
LO AD CURRENT (A)
1.5
V
OUT
= 1.8V
2
3
4
INPUT VOLTAGE (V)
5
Output Voltage
v s. Temperature
1.88
1.86
OUTPUT VO LTAGE (V)
Therm al Shutdown
2.0
1.8
1.6
O UTPUT VO LTAG E (V)
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-40
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
MIC38150 Efficiency
1.84
1.82
1.80
1.78
1.76
1.74
1.72
-40
-20
0
20 40 60 80 100 120
T EM PERAT URE (°C)
V
IN
= 3.3V
I
OUT
= 10mA
V
IN
= 3.3V
V
OUT
= 1.8V
10
60
110
160
T EMPERAT URE (°C)
210
V
IN
= 5.0V
V
OUT
= 3.3V
R
LPF
= 25kΩ
0
0.3
0.6
0.9
1.2
LO AD CURRENT (A)
1.5
0
Dropout Voltage
v s. Load Current
0.9
0.8
DROPO UT VO LTAGE (V)
DROPO UT VO LTAGE (V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
0.5
1
LOAD CURRENT (A)
1.5
0.8
1.0
Dropout Voltage
v s. Temperature
4.0
3.8
3.6
CURRENT LIM IT (A)
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
-40
-20
0
20 40 60 80 100 120
T EM PERAT URE (°C)
Current Lim it
v s. Input Voltage
0.6
0.4
0.2
V
OUT
= 3.3V
0.0
V
OUT
= 3.3V
I
OUT
= 1.5A
V
OUT
= 1.8V
C
OUT
= 20µF
R
LPF
= 25kΩ
3
3.5
4
4.5
5
INPUT VO LT AG E (V)
5.5
Enable Threshold
1.20
OPERATING CURRENT (mA)
1.15
ENABLE VOLTAGE (V)
1.10
1.05
1.00
0.95
0.90
0.85
0.80
3
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
60
50
40
30
20
10
0
3
Operating Current
vs. Input Voltage
V
OUT
= 1.8V
V
OUT
= 1.8V
C
OUT
= 20µF
3.5
4
4.5
5
INPUT VOLTAGE (V)
5.5
June 2010
4
M9999-061010-C
Micrel, Inc.
MIC38150
Typical Characteristics
V
IN
= 3.3V, V
OUT
= 1.8V, C
OUT
= 10µF, R
LPF
= 25kΩ, I
OUT
= 100mA, unless noted
Switch Frequency v s.
RLPF Resistance (3.3V-1.0V)
3
2.5
SW FREQUENCY (MHz)
Switch Frequency v s.
RLPF Resistance (3.3V-1.8V)
3
Switch Frequency v s.
RLPF Resistance (5.0V-1.0V)
3
2.5
1A
SW FREQUENCY (M Hz)
2.5
2
1.5
1
0.5
0
10
100
RLPF (kΩ)
1000
2
1.5
1
0.5
0
10
100
RLPF (kΩ)
500mA
SW FREQUENCY (MHz)
500mA
1.5A
1.5A
1A
2
1.5
1
0.5
0
10
100
RLPF (kΩ)
10mA
1A
10mA
1.5A
10mA
500mA
1000
1000
Switch Frequency vs.
RLPF Resistance (5.0V-1.8V)
3
2.5
Switch Frequency v s.
RLPF Resistance (5.0V-2.5V)
3
1.5A
SW FREQUENCY (MHz)
1.5A
1A
2.5
2
1.5
SW FREQUENCY (M Hz)
500mA
2
1.5
10mA
1
0.5
0
10
100
RLPF (kΩ)
1000
500mA
10mA
1
0.5
0
10
100
RLPF (kΩ)
1000
1A
June 2010
5
M9999-061010-C
51单片机
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
