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PDF APL5336 Data sheet ( Hoja de datos )
| Número de pieza | APL5336 | |
| Descripción | Fast Transient Response Linear Regulator | |
| Fabricantes | Anpec Electronics | |
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APL5336
Source and Sink, 1.5A, Fast Transient Response Linear Regulator
Features
• Provide Bi-direction Output Currents
Sourcing and Sinking Current up to 1.5A
• Built-in Soft-Start
• Power-On-Reset Monitoring on VCNTL and VIN
pins
• Fast Transient Response
• Stable with Ceramic Output Capacitors
• ±20mV High System Output Accuracy over Load
and Temperature Ranges
• Adjustable Output Voltage by External Resistors
• Current-Limit Protection
• On-Chip Thermal Shutdown
• Shutdown for Standby or Suspend Mode
• Simple SOP-8 and SOP-8 with Exposed Pad
(SOP-8P) Packages
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• DDRII/III SDRAM Termination Voltage
• Motherboard and VGA Card Power Supplies
• Setop Box
• SSTL-2/3 Termination Voltage
Simplified Application Circuit
VCNTL
+5V
VIN
+1.8V/+1.5V
Shutdown
Enable
1 VIN
6
VCNTL
APL5336
3 VREF VOUT 4
GND
2
VOUT
0.9V / 0.75V
General Description
The APL5336 linear regulator is designed to provide a
regulated voltage with bi-direction output current for DDR-
SDRAM termination voltage. The APL5336 integrates two
power transistors to source or sink load current up to
1.5A. It also features internal soft-start, current-limit, ther-
mal shutdown and enable control functions into a single
chip.
The internal soft-start controls the rising rate of the output
voltage to prevent inrush current during start-up. The
current-limit circuit detects the output current and limits
the current during short-circuit or current overload
conditions. The on-chip thermal shutdown provides ther-
mal protection against any combination of overload that
would create excessive junction temperatures.
The output voltage of APL5336 is regulated to track the
voltage on VREF pin. An proper resistor divider connected
to VIN, GND, and VREF pins is used to provide a half
voltage of VIN to VREF pin. In addition, connect an exter-
nal ceramic capacitor and a open-drain transistor to VREF
pin for external soft-start and shutdown control.
Pulling and holding the voltage on VREF below the en-
able voltage threshold shuts down the output. The output
of APL5336 will be high impedance after being shut down
by VREF or the thermal shutdown function.
Pin Configuration
VIN 1
GND 2
VREF 3
VOUT 4
Top View of SOP-8
8 VCNTL
7 VCNTL
6 VCNTL
5 VCNTL
VIN 1
GND 2
VREF 3
VOUT 4
8 NC
7 NC
6 VCNTL
5 NC
Top View of SOP-8P
Exposed Pad (connected to GND 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.2 - Apr., 2008
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APL5336
Typical Operating Characteristics
VOUT Offset Voltage vs.
Junction Temperature
10
8
6
IOUT= -10mA
4
2 IOUT= 10mA
0
-2 VIN=1.5V
-4
-50
4
-25 0 25 50 75 100 125
Junction Temperature (TJ ,oC)
Sinking Current-Limit vs.
Junction Temperature
150
3.5
3
2.5
2
VIN=2.5V
1.5 VIN=1.8V
VIN=1.5V
1
Sinking Current
0.5 VREF=0.5xVIN
VCNTL=5V
0
-50 -25 0 25 50 75 100
Junction Temperature (TJ ,oC)
Sourcing Current-Limit vs.
Junction Temperature
2.5
125
2 VIN=1.8V
1.5
1 VIN=1.5V
0.5 Sourcing Current
VREF=0.5xVIN
0 VCNTL=3.3V
-50 -25 0 25 50 75 100
Junction Temperature (oC)
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Apr., 2008
125
5
Sourcing Current-Limit vs.
Junction Temperature
3.5
3
2.5
2
1.5 VIN=2.5V
VIN=1.8V
1 VIN=1.5V
Sourcing Current
0.5 VREF=0.5xVIN
VCNTL=5V
0
-50 -25 0 25 50 75 100
Junction Temperature (TJ ,oC)
VCNTL Power Supply
Rejection Ratio (PSRR)
0
VCNTL=5V, COUT=10µF(MLCC)
-10 VREF=0.5xVIN
-20
125
-30
VIN=2.5V,IOUT=1.5A
-40 VIN=2.5V,IOUT=0.5A
-50
-60
-70
-80
1000
3
VIN=1.5V,IOUT=1.5A
VIN=1.5V,IOUT=0.5A
10000
100000
Frequency (HZ)
Sinking Current-Limit vs.
Junction Temperature
1000000
2.5
2
1.5 VIN=1.8V
VIN=1.5V
1
Sinking Current
0.5 VREF=0.5xVIN
VCNTL=3.3V
0
-50 -25 0 25 50 75 100 125
Junction Temperature (oC)
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
5 Page 
APL5336
Typical Application Circuit
VCNTL
+5V
VIN
+1.8V/+1.5V
C2
47µF
R1
100kΩ
Shutdown
Enable
Q1
R2
100kΩ
1 VIN
VCNTL
APL5336
3 VREF
VOUT
GND
VREF
2
6
4
C4
1µF
C1
1µF
C5
10µF
VOUT
0.9V/0.75V
C3
100µF
(optional)
The ceramic capacitor C5 ( at least 8µF) is necessary for output stability.
Function Description
low 0.3V (typical) shuts down the output of the regulator.
Power-On-Reset
In the typical application, an NPN transistor or N-channel
A Power-On-Reset (POR) circuit monitors both input volt- MOSFET is used to pull down the VREF while applying a
ages at VCNTL and VIN pins to prevent wrong logic “high” signal to turn on the transistor. When shutdown
controls. The POR function initiates a soft-start process function is active, both of the internal power MOSFETs are
after both of the supply voltages exceed their rising POR turned off and the impedance of the VOUT pin is larger
voltage thresholds during powering on.
than 10MΩ.
Output Voltage Regulation
The output voltage on VOUT pin is regulated to track the
reference voltage applied on VREF pin. Two internal N-
channel power MOSFETs controlled by high bandwidth
error amplifiers regulate the output voltage by sourcing
current from VIN pin or sinking current to GND pin. An
internal output voltage sense pad is bonded to the VOUT
pin with a bonding wire for perfect load regulation.
For preventing the two power MOSFETs from shoot-
through, a small voltage offset between the positive in-
puts of the two error amplifiers is designed. It results in
higher output voltage while the regulator sinks light or
heavy load current.
The APL5336 provides very fast load transient response
at small output capacitance to save total cost.
Current-Limit
The APL5336 monitors the output current, both sourcing
and sinking current, and limits the maximum output cur-
rent to prevent damages during current overload or short-
circuit (shorted from VOUT to GND or VIN) conditions.
Enable
The VREF pin is a multi-function input pin which is the
reference voltage input pin and the enable control input
pin. Applying and holding the voltage (VREF) on VREF be-
Internal and External Soft-Start
The APL5336 is designed with an internal soft-start func-
tion to control the rise rate of the output voltage to prevent
inrush current during start-up.
When release the pull-low transistor connected with VREF
pin, the current via the resistor divider charges the exter-
nal soft-start capacitor (C4) and the VREF starts to rise up.
The IC starts a soft-start process when the VREF reaches
the enable voltage threshold. The output voltage is regu-
lated to follow the lower voltage, which is either the inter-
nal soft-start voltage ramp or the VREF voltage, to rise up.
The external soft-start interval is programmable by the
resistor-divider and the soft-start capacitor (C4).
Thermal Shutdown
The thermal shutdown circuit limits the junction tempera-
ture of the APL5336. When the junction temperature ex-
ceeds 150oC, a thermal sensor turns off the both pass
transistors, allowing the device to cool down. The ther-
mal sensor allows the regulator to regulate again after
the junction temperature cools by 40oC, resulting in a
pulsed output during continuous thermal overload
conditions. The thermal limit is designed with a 40oC
hysteresis to lower the average TJ during continuous ther-
mal overload conditions, increasing lifetime of the
APL5336.
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Apr., 2008
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet APL5336.PDF ] | |
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