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PDF APL5920 Data sheet ( Hoja de datos )
| Número de pieza | APL5920 | |
| Descripción | Ultra Low Dropout (0.24V Typical) Linear Regulator | |
| Fabricantes | ANPEC | |
| Logotipo |  |
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APL5920
2A, Ultra Low Dropout (0.24V Typical) Linear Regulator
Features
General Description
• Ultra Low Dropout
- 0.24V (Typical) at 2A 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
The APL5920 is a 2A ultra low dropout linear regulator.
The IC needs two supply voltages, one is a control volt-
age (VCNTL) for the control circuitry, the other is a main
supply Voltage(VIN) for power conversion, to reduce power
dissipation and provide extremely low dropout voltage.
The APL5920 integrates many functions. A Power-On-Re-
set (POR) circuit monitors both supply voltages on V
CNTL
and V pins to prevent erroneous operations. The func-
IN
tions of thermal shutdown and current-limit protect 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 APL5920 can be enabled by other power
systems. Pulling and holding the EN voltage below 0.4V
shuts off the output.
The APL5920 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
• Motherboards, VGA Cards
• Notebook PCs
• Add-in Cards
Pin Configuration
POK 1
EN 2
VIN 3
VCNTL 4
SOP-8P
(Top View)
8 GND
7 FB
6 VOUT
5 NC
POK
EN
Enable
VCNTL
POK
VIN
VOUT
APL5920
EN FB
GND
VCNTL
VIN
VOUT
Optional
= 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 - Oct., 2010
1
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
1 page  
APL5920
Typical Operating Characteristics
Current-Limit vs.
Junction Temperature
4.3
VOUT = 1.2V
4.1
3.9
VCNTL = 5V
3.7
3.5
3.3
3.1 VCNTL = 3.3V
2.9
2.7
2.5
-50 -25 0 25 50 75 100 125
Junction Temperature (oC)
Dropout Voltage vs. Output Current
400
VCNTL = 5V
350 VOUT = 1.2V
300
250
TJ = 125 C
TJ = 75 C
200 TJ = 25 C
150
100 TJ = 0 C
50 TJ = - C
0
0 0.5 1 1.5 2
Output Current, IOUT (A)
Dropout Voltage vs. Output Current
400
VCNTL = 5V
350 VOUT = 1.8V
300
TJ = 125 C
250 TJ = 75 C
200 TJ = 25 C
150
100 TJ = 0 C
50 TJ = - C
0
0 0.5 1 1.5 2
Output Current, IOUT (A)
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Oct., 2010
5
Short Current-Limit vs.
Junction Temperature
900
850
800
VCNTL = 5V
750
700
650
VCNTL = 3.3V
600
550
500
Junction Temperature (oC)
Droput Voltage vs. Output Current
400
VCNTL = 3.3V
350 VOUT = 1.2V
300
TJ = 125 C
TJ = 75 C
250 TJ = 25 C
200
150
TJ = 0 C
100
50 TJ = - C
0
0 0.5 1 1.5 2
Output Current, IOUT (A)
Dropout Voltage vs. Output Current
450
400 VCNTL = 3.3V
VOUT = 1.5V
350
TJ = 125 C
300 TJ = 75 C
250 TJ = 25 C
200
150
TJ = 0 C
100
TJ = - C
50
0
0 0.5 1 1.5 2
Output Current, IOUT (A)
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
5 Page 
APL5920
Function Description
Power-On-Reset
A Power-On-Reset (POR) circuit monitors both of supply
voltages on VCNTL and VIN pins to prevent wrong logic
controls. The POR function initiates a soft-start process
after both of the supply voltages exceed their rising POR
voltage thresholds during powering on. The POR func-
tion also pulls low the POK voltage regardless of the
output status when one of the supply voltages falls below
its falling POR voltage threshold.
Internal Soft-Start
An internal soft-start function controls rise rate of the out-
put voltage to limit the current surge during start-up. The
typical soft-start interval is about 0.6ms.
Output Voltage Regulation
An error amplifier working with a temperature-compen-
sated 0.8V reference and an output NMOS regulates out-
put to the preset voltage. The error amplifier is designed
with high bandwidth and DC gain provides very fast tran-
sient response and less load regulation. It compares the
reference with the feedback voltage and amplifies the dif-
ference to drive the output NMOS which provides load
current from VIN to VOUT.
Thermal Shutdown
A thermal shutdown circuit limits the junction tempera-
ture of APL5920. When the junction temperature exceeds
+170oC, a thermal sensor turns off the output NMOS, al-
lowing the device to cool down. The regulator regulates
the output again through initiation of a new soft-start pro-
cess after the junction temperature cools by 50oC, result-
ing in a pulsed output during continuous thermal over-
load conditions. The thermal shutdown is designed with
a 50oC hysteresis to lower the average junction tempera-
ture during continuous thermal overload conditions, ex-
tending lifetime of the device.
For normal operation, the device power dissipation should
be externally limited so that junction temperatures will
not exceed +125οC.
Enable Control
The APL5920 has a dedicated enable pin (EN). A logic
low signal applied to this pin shuts down the output. Fol-
lowing a shutdown, a logic high signal re-enables the
output through initiation of a new soft-start cycle. When
left open, this pin is pulled up by an internal current source
(5µA typical) to enable normal operation. It’s not neces-
sary to use an external transistor to save cost.
Current-Limit Protection
The APL5920 monitors the current flowing through the
output NMOS and limits the maximum current to prevent
load and APL5920 from damages during current over-
load conditions.
Short Current-Limit Protection
The short current-limit function reduces the current-limit
level down to 0.8A (typical) when the voltage on FB pin
falls below 0.2V (typical) during current overload or short-
circuit conditions.
The short current-limit function is disabled for success-
ful start-up during soft-start.
Power-OK and Delay
The APL5920 indicates the status of the output voltage by
monitoring the feedback voltage (VFB) on FB pin. As the
VFB rises and reaches the rising Power-OK voltage thresh-
old (VTHPOK), an internal delay function starts to work. At the
end of the delay time, the IC turns off the internal NMOS of
the POK to indicate the output is ok. As the V falls and
FB
reaches the falling Power-OK voltage threshold, the IC
turns on the NMOS of the POK ( after a debounce time of
10µs typical ).
Copyright © ANPEC Electronics Corp.
Rev. A.4 - Oct., 2010
11
www.anpec.com.tw
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet APL5920.PDF ] | |
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