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PDF APL5503 Data sheet ( Hoja de datos )
| Número de pieza | APL5503 | |
| Descripción | (APL5501 - APL5503) Low Dropout 500mA Fixed Voltage Regulator | |
| Fabricantes | Anpec Electronics | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de APL5503 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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APL5501/2/3
Low IQ, Low Dropout 500mA Fixed Voltage Regulator
Features
• Low Noise : 50µVRMS (100Hz to 100kHz)
• Low Quiescent Current : 50µA (No load)
• Low Dropout Voltage : 170mV (@500mA)
• Very low Shutdown Current : < 0.5uA
• Fixed Output Voltage : 1.3V ~ 3.4V
www.DataSheet4U.com
• Stable with 4.7uF Output Capacitor
• Stable with Aluminum, Tantalum or Ceramic
Capacitors
• Reverse Current Protection
• No Protection Diodes Needed
• Built in Thermal Protection
• Built in Current Limit Protection
• Controlled Short Circuit Current : 150mA
• Fast Transient Response
• Short Setting Time
• SOT-23-5, SOT-89, SOT-89-5, SOT-223, SO-8,
TO-252 and TO-252-5 Packages
• Lead Free Available (RoHS Compliant)
Applications
Design with an internal P-channel MOSFET pass
transistor, the APL5501/2/3 maintains a low supply
current, independent of the load current and dropout
voltage. Other features include reverse current
protection, thermal-shutdown protection, current limit
protection to ensure specified output current and con-
trolled short-circuit current. The APL5501/2/3 regu-
lator comes in a miniature SOT-23-5, SOT-89, SOT-
89-5, SOT-223, SO-8, TO-252 and TO-252-5
packages.
Pin Configuration
TAB is GND
APL5501
BP GND SHDN
54
1 23
1 23
V IN G N D
VOUT
SOT-89 (Top View)
VOUT GND VIN
SOT-89-5 (Top View)
• Notebook Computer
• PDA or Portable Equipments
• Noise-Sensitive Instrumentation Systems
IN
GND
GND
SHDN
1
2
3
4
8 OUT
7 GND
6 GND
5 BYP
VIN 1
GND
2
SHDN
3
5 VOUT
4 BP
General Description
SO-8 (Top View)
SOT-23-5 (Top View)
The APL5501/2/3 is micropower, low noise, low drop-
out linear regulator. Operate from 2.7V to 6V input
voltage and deliver up to 500mA. Typical output noise
is just 50µVRMS with the addition of an external 0.1µF
bypass capacitor in BP pin and typical dropout volt-
age is only 170mV at 500mA loading . Designed for
use in battery-powered system, the low 50uA quies-
cent current makes it an ideal choice.
GND
1 23
VIN VOUT
VOUT
BP
GND
SHDN
VIN
TO-252 (Top View)
TO-252-5 (Top View)
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. B.2 - May., 2005
1
www.anpec.com.tw
1 page  
APL5501/2/3
Application Circuit
INPUT
2.7V to 6V
www.DataSheet4U.com
CIN
1uF
VIN VOUT
APL5501/2/3
on SHDN BP
GND
off
CBP 0.1uF
VOUT
COUT
4.7uF
Copyright © ANPEC Electronics Corp.
Rev. B.2 - May., 2005
5
www.anpec.com.tw
5 Page 
APL5501/2/3
Application Information
Capacitor Selection and Regulator
Stability
The APL5501/2/3 use at least a 1uF capacitor on the
input, and this capacitor can be Aluminum, Tantalum
or Ceramic capacitor. The input capacitor with larger
www.DataSheet4U.cvoamlue and lower ESR provides better PSRR and line-
transient response. The output capacitor also can use
Aluminum, Tantalum or Ceramic capacitor, and a mini-
mum value of 1uF and ESR above 0.06Ω is
recommended. The curve of the stable region in typi-
cal characteristics shows the appropriate output ca-
pacitor ESR for different load current stable operation.
A larger output capacitor can reduce noise and im-
prove load-transient response, stability, and PSRR.
Note that some ceramic dielectrics exhibit large ca-
pacitance and ESR variation with temperature. When
using this capacitor, a minimum 10uF or more may
be required to ensure the stability at low temperature
operation. Use a bypass capacitor at BP pin for low
output nvise. Increasing the capacitance will slightly
decrease the output noise, but increase the start-up
time.
Load-Transient Considerations
end-of-life battery voltage. Because the APL5501/2/3
use a p-channel MOSFET pass transistor, the drop-
out voltage is a function of drain-to-source on-resis-
tance (RDS(ON)) multiplied by the load current.
Reverse Current Protection
The APL5501/2/3 have an internal reverse protection,
it does not need an external schottky diode to con-
nect the regulator input and output. If the output volt-
age is forced above the input voltage by more than
11mV, the IC will be shutdown and the ground pin
current is below 0.1uA.
Shutdown/Enable
The APL5501/2/3 have an active high enable function.
Force EN high (>1.6V) enables the regulator, EN low
(<0.4V) disables the regulator and enter the shutdown
mode. In shutdown mode, the quiescent current can
reduce below 1uA. The EN pin cannot be floating, a
floating EN pin may cause an indeterminate state on
the output. If it is no use, connect to VIN for normal
operation.
The APL5501/2/3 load-transient response graphs in
typical characteristics show the transient response.
A step change in the load current from 0mA to 500mA
at 1us will cause a 100mV transient spike. Larger
output capacitor and lower ESR can reduce transient
spike.
Input-Output (Dropout)Voltage
The minimum input-output voltage difference (dropout)
determines the lowest usable supply voltage. In bat-
tery-powered systems, this will determine the useful
Current Limit
The APL5501/2/3 have a current limit protection. The
ouptut voltage will drop close to zero volt, when load
current reaches the limit, and then the load current
will be limited at 150mA after output voltage is below
0.7V. When the load current back to the value where
limiting started, the output voltage and current will re-
turn to normal value. When output is shorted to
ground, the APL5501/2/3 will keep short circuit cur-
rent at 150mA .
Copyright © ANPEC Electronics Corp.
Rev. B.2 - May., 2005
11
www.anpec.com.tw
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet APL5503.PDF ] | |
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