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PDF APL5910 Data sheet ( Hoja de datos )
| Número de pieza | APL5910 | |
| Descripción | Ultra Low Dropout (0.12V Typical) Linear Regulator | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL5910
1A, Ultra Low Dropout (0.12V Typical) Linear Regulator
Features
General Description
• Ultra Low Dropout
- 0.12V (Typical) at 1A Output Current
• 0.8V Reference Voltage
• High Output Accuracy
- ±1.5% over Line, Load, and Temperature Range
• Fast Transient Response
• Adjustable Output Voltage
• Power-On-Reset Monitoring on Both VCNTL and
VIN Pins
• Internal Soft-Start
• Current-Limit and Short Current-Limit Protections
• Thermal Shutdown with Hysteresis
• Open-Drain VOUT Voltage Indicator (POK)
• Low Shutdown Quiescent Current (< 30µA )
• Shutdown/Enable Control Function
• Simple SOP-8P Package with Exposed Pad
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• Motherboards, VGA Cards
• Notebook PCs
• Add-in Cards
Pin Configuration
POK 1
EN 2
VIN 3
VCNTL 4
8 GND
7 FB
6 VOUT
5 NC
The APL5910 is a 1A ultra low dropout linear regulator.
The IC needs two supply voltages, one is the control volt-
age (VCNTL) for the control circuitry, the other is the main
supply voltage (VIN) for power conversion, to reduce power
dissipation and provide extremely low dropout voltage.
The APL5910 integrates many functions. A Power-On-
Reset (POR) circuit monitors both supply voltages on
VCNTL and VIN pins to prevent erroneous operations.
The functions of thermal shutdown and current-limit pro-
tect the device against thermal and current over-loads. A
POK indicates that the output voltage status with a delay
time set internally. It can control other converter for power
sequence. The APL5910 can be enabled by other power
systems. Pulling and holding the EN voltage below 0.4V
shuts off the output.
The APL5910 is available in a SOP-8P package which
features small size as SOP-8 and an Exposed Pad to
reduce the junction-to-case resistance to extend power
range of applications.
Simplified Application Circuit
VCNTL
POK
EN
Enable
VCNTL
POK VIN
VOUT
APL5910
EN FB
GND
VIN
VOUT
Optional
SOP-8P (Top View)
= Exposed Pad
(connected to ground plane for better heat dissipation)
ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Nov., 2010
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APL5910
Typical Operating Characteristics
Current-Limit vs.
Junction Temperature
2.5
2.4 VOUT = 1.2V
2.3
2.2 VCNTL = 5V
2.1
2.0
1.9
1.8 VCNTL = 3.3V
1.7
1.6
1.5
1.4
-50 -25 0 25 50 75 100
125
Junction Temperature (oC)
Dropout Voltage vs.
Output Current
180
160
VCNTL = 5V
VOUT = 1.2V
140
TJ = 125 C
120 TJ = 75 C
100 TJ = 25 C
80
60 TJ = 0 C
40
TJ = - C
20
0
0 0.25 0.5 0.75 1
Output Current, IOUT (A)
Dropout Voltage vs.
Output Current
200
180 VCNTL = 5V
VOUT = 1.8V
160
TJ = 125 C
140 TJ = 75 C
120 TJ = 25 C
100
80
60
TJ = 0 C
40
20 TJ = - C
0
0 0.25 0.5 0.75 1
Output Current, IOUT (A)
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Nov., 2010
5
Short Current-Limit vs.
Junction Temperature
600
550
500
450 VCNTL = 3.3V
400
350 VCNTL = 5V
300
250
200
-50 -25
0
25 50 75 100 125
Junction Temperature (oC)
Droput Voltage vs.
Output Current
200
180 VCNTL = 3.3V
VOUT = 1.2V
160
TJ = 125 C
140 TJ = 75 C
120 TJ = 25 C
100
80
60 TJ = 0 C
40 TJ = - C
20
0
0 0.25 0.5 0.75 1
Output Current, IOUT (A)
Dropout Voltage vs.
Output Current
220
200 VCNTL = 3.3V
180 VOUT = 1.8V
TJ = 125 C
160 TJ = 75 C
140 TJ = 25 C
120
100
80 TJ = 0 C
60
40 TJ = - C
20
0
0 0.25 0.5 0.75 1
Output Current, IOUT (A)
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APL5910
Application Information
Power Sequencing
The power sequencing of VIN and VCNTL is not neces-
sary to be concerned. However, do not apply a voltage to
VOUT for a long time when the main voltage applied at
VIN does not present. The reason is the internal parasitic
diode from VOUT to VIN conducts and dissipates power
without protections due to the forward-voltage.
Output Capacitor
The APL5910 requires a proper output capacitor to main-
tain stability and improve transient response. The output
capacitor selection is dependent upon ESR (equivalent
series resistance) and capacitance of the output capacitor
over the operating temperature.
Ultra-low-ESR capacitors (such as ceramic chip
capacitors) and low-ESR bulk capacitors (such as solid
tantalum, POSCap, and Aluminum electrolytic capacitors)
can all be used as output capacitors.
During load transients, the output capacitors which is de-
pending on the stepping amplitude and slew rate of load
current, are used to reduce the slew rate of the current
seen by the APL5910 and help the device to minimize the
variations of output voltage for good transient response.
For the applications with large stepping load current, the
low-ESR bulk capacitors are normally recommended.
Decoupling ceramic capacitors must be placed at the load
and ground pins as close as possible and the imped-
ance of the layout must be minimized.
More capacitance reduces the variations of the supply
voltage on VIN pin.
Setting The Output Voltage
The output voltage is programmed by the resistor divider
connected to FB pin. The preset output voltage is calcu-
lated by the following equation :
VOUT
=
0.8
⋅
1 +
R1
R2
........... (V)
where R1 is the resistor connected from VOUT to FB with
Kelvin sensing connection and R2 is the resistor con-
nected from FB to GND. A bypass capacitor (C1) may be
connected with R1 in parallel to improve load transient
response and stability.
Input Capacitor
The APL5910 requires proper input capacitors to supply
current surge during stepping load transients to prevent
the input voltage rail from dropping. Because the para-
sitic inductor from the voltage sources or other bulk ca-
pacitors to the VIN pin limits the slew rate of the surge
currents, more parasitic inductance needs, more input
capacitance.
Ultra-low-ESR capacitors (such as ceramic chip
capacitors) and low-ESR bulk capacitors (such as solid
tantalum, POSCap, and Aluminum electrolytic capacitors)
can all be used as an input capacitor of VIN. For most
applications, the recommended input capacitance of VIN
is 10µF at least. However, if the drop of the input voltage
is not cared, the input capacitance can be less than 10µF.
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Nov., 2010
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
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| PDF Descargar | [ Datasheet APL5910.PDF ] | |
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