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PDF MIC29311-5.1BU Data sheet ( Hoja de datos )
| Número de pieza | MIC29311-5.1BU | |
| Descripción | 3A Fast-Response LDO Regulator for USB Preliminary Information | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC29311
Micrel
MIC29311
3A Fast-Response LDO Regulator for USB
Preliminary Information
General Description
The MIC29311 is a 3A, fast response, low-dropout (LDO)
voltage regulator. Using Micrel’s proprietary Super βeta
PNP™ process, the MIC29311 offers exceptional dropout
(600mV at 3A) and low ground current (60mA at 3A). Fast
transient response allows it to recover quickly from large load
changes while maintaining a steady output. The device can
be sent into a “zero-current” off mode when the TTL compat-
ible enable is brought low.
Designed specifically for Universal Serial Bus (USB) applica-
tions, the MIC29311 works with USB power switches to
provide an economical solution for self-powered hubs. The
5.1V output voltage is optimized to work with lower-cost high
on-resistance USB power switches (300mΩ) to provide a
minimum of 4.75V at 500mA to downstream ports. Used with
MIC2527 quad USB power switches, the MIC29311 can
power up to 6 downstream ports.
Features of the MIC29311 include thermal shutdown, current
limit, reversed-battery and reversed-lead insertion protec-
tion. An overvoltage clamp is available to maintain a safe
output when the input voltage exceeds 8V. An error flag is
also available to indicate of the output falls out of regulation,
or when an overcurrent condition occurs.
The MIC29311 is available in a 5-pin TO-220 or TO-263
package with a fixed 5.1V output voltage.
For other high current, low-dropout voltage regulators, please
see the MIC29150/300/500/750 and the MIC29310,
MIC29510, MIC29710.
Features
• Fast transient response
• 3A output current over full temperature range
• 600mV dropout voltage at full load
• Low ground current
• 3% total accuracy
• “Zero” off-mode current
• Thermal Shutdown
• Current Limiting
• Reversed battery protection
• Fixed 5.1V Output
Applications
• Self-powered USB hubs
• USB power switching
• High-efficiency linear power supplies
• High-efficiency switching supply post-regulator
Typical Application
AC 6.3Vac
Line 3A
VBUS
100mA
max.
MIC5207-3.3
LDO Regulator
IN OUT
D+
D– GND
GND
Upstream
USB Port
4.7
µF
47µF
MIC29311-5.1
LDO Regulator
5.8V @ 3A
IN
5.1V
OUT
EN FLAG
10k GND
3.3V USB Controller
33µF
V+ ON/OFF
1.0 OVERCURRENT
µF
D+
D– GND
Bold lines indicate
0.1" wide, 1-oz. copper
high-current traces.
10k
33µF
33µF
Ferrite
Bead
0.01µF
VBUS
D+
D–
GND
Downstream
USB
Port 1
4.75V min
500mA max.
0.01µF
VBUS
D+
D–
GND
Downstream
USB
Port 2
4.75V min
500mA max.
33µF
0.01µF
VBUS
D+
D–
GND
Downstream
USB
Port 6
4.75V min
500mA max.
Simple USB Stand-Alone 6-Port Self-Powered Hub
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
December 1998
1
MIC29311
1 page  
MIC29311
Typical Characteristics
Dropout Voltage
vs. Output Current
0.6
0.5
0.4
0.3
0.2
0.1
0.00 1 2 3
OUTPUT CURRENT (A)
Ground Current
vs. Input Voltage
2.0
IOUT = 10mA
1.5
1.0
0.5
0.0
0
2 4 6 8 10
INPUT VOLTAGE (V)
Ground Current
vs. Temperature
6
5
4
3 IOUT = 750mA
2
1
0
0 30 60 90 120 150
TEMPERATURE (°C)
Ground Current
vs. Output Current
60
50
40
30
20
10
0
0123
OUTPUT CURRENT (A)
December 1998
MIC2931x Dropout Voltage
vs. Temperature
1.0
0.8
0.6
0.4 ILOAD = 3A
0.2
0
0 30 60 90 120 150
TEMPERATURE (°C)
Ground Current
vs. Input Voltage
200
IOUT = 3A
150
100
50
0
0 2 4 6 8 10
INPUT VOLTAGE (V)
Ground Current
vs. Temperature
20
15
10 IOUT = 1.5A
5
0
0 30 60 90 120 150
TEMPERATURE (°C)
5.20
5.18
5.16
5.14
5.12
5.10
5.08
5.06
5.04
5.02
5.00
0
Output Voltage
vs. Temperature
Awaiting Further
Characterization
Data
30 60 90 120 150
TEMPERATURE (°C)
5
Micrel
Dropout
Characteristics
7
6
5 ILOADA=w1a0imtinAg Further
4 Characterization
3 Data
2 ILOAD = 3A
1
0
024
INPUT VOLTAGE (V)
6
Ground Current
vs. Input Voltage
2.0
1.5 VOUT = 3.3V
1.0
0.5
0.0
-0.5
-20
RLOAD = 100Ω
-10 0 10
INPUT VOLTAGE (V)
20
Ground Current
vs. Temperature
100
80
IOUT = 3A
60
40
20
0
0 30 60 90 120 150
TEMPERATURE (°C)
Short Circuit
Current vs. Temperature
6
5
4
3
VOUT = 0V
2
1
0
0 30 60 90 120 150
TEMPERATURE (°C)
MIC29311
5 Page 
MIC29311
Micrel
December 1998
11
MIC29311
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MIC29311-5.1BU.PDF ] | |
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