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PDF APL5338A Data sheet ( Hoja de datos )
| Número de pieza | APL5338A | |
| Descripción | 2A Bus Termination Regulator | |
| Fabricantes | Anpec Electronics | |
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APL5338A
2A Bus Termination Regulator
Features
General Description
• Sourcing and Sinking Current up to 2A
The APL5338A linear regulator is designed to provide a
• VCNTL Supply Voltage Range: 3.1V to 5.5V
regulated voltage with bi-directional output current for
• VIN Supply Voltage Range: 1.2V to 3.6V
DDR-SDRAM termination. The APL5338A integrates two
power transistors to source or sink current up to 2A. It
• VTT and VTTREF Voltage Tracks at Half the VREF also incorporates current-limit and thermal shutdown into
Voltage
a single chip.
• VTT and VTTREF Voltage with ±10mV Accuracy The output voltage of APL5338A tracks the voltage at VREF
• Excellent Load Transient Response
pin. An internal resistor divider is used to provide a half
• Stable with 10µF Ceramic Output Capacitor
• Current-Limit Protection
• Thermal Shutdown Protection
• Power-On-Reset Function on VCNTL
voltage of VREF for VTTREF and VTT Voltage. The VTT
output voltage is only requiring 10µF of ceramic output
capacitance for stability and fast transient response. The
S3 and S5 pins provide the sleep state for VTT (S3 state)
and suspend state (S4/S5 state) for device when S5 and
• S3, S5 Input Signals for ACPI States
S3 are both pulled low the device provides the soft-off for
• Small MSOP-10P, DFN2x2-8 and TDFN3x3-10 VTT and VTTREF. The MSOP-10P, DFN2x2-8 and
Packages
TDFN3x3-10 packages with a copper pad is available
• Lead Free and Green Devices Available
which provides excellent thermal impedance.
(RoHS Compliant)
Simplified Application Circuit
CIN
10µF
COUT
10µF
APL5338A
1
VREF
2 VIN
10
VCNTL
S5 9
3
VTT
GND 8
4
PGND
S3 7
5 VTTSNS VTTREF 6
C1
0.1µF
Applications
• DDR 2/3 Memory Termination
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 - Aug., 2013
1
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
1 page  
APL5338A
Electrical Characteristics (Cont.)
Unless otherwise specified, these specifications apply over VCNTL=5V, VIN=VREF=1.8V, CIN=10µF, COUT=10µF and TA= -40 ~ 85 oC.
Typical values are at TA=25oC.
Symbol
Parameter
Test Conditions
APL5338A
Unit
Min. Typ. Max.
LOGIC THRESHOLD
VIH High Threshold Voltage
VIL Low Threshold Voltage
S3, S5 Hysteresis
Leakage Current
THERMAL SHUTDOWN
VS3, VS5 Rising
VS3, VS5 Falling
S3, S5, TJ =25 oC
1.6 -
-
- - 0.4 V
- 0.2 -
- - 4 µA
TSD Thermal Shutdown Temperature TJ Rising
Thermal Shutdown Hysteresis
- 150 -
oC
- 30 -
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Aug., 2013
5
www.anpec.com.tw
FreeDatasheethttp://www.datasheet4u.com/
5 Page 
APL5338A
Function Description
VTT Source/Sink Regulator
The APL5338A is a low dropout source/sink linear regu-
lator with maximum 2A source/sink current. Two internal
N-channel MOSFETs controlled by separate high band-
width error amplifiers regulate the output voltage by sourc-
ing current from VIN or sinking current to PGND. To pre-
vent two pass elements from shoot-through, a voltage
offset is created between two positive inputs of the error
amplifiers.
Power-On-Reset (POR)
The APL5338A monitors the VCNTL pin voltage for power-
on-reset function to prevent erroneous operation. The
built-in POR circuit keeps the outputs shutoff until inter-
nal circuit is operating properly. Typical POR threshold is
2.8V with 0.2V hysteresis.
VTTREF Regulator
VTTREF voltage follows 1/2VREF voltage which is the
reference of the VTT regulator. The VTTREF block con-
sists of a resistor divider and a low pass filter. The regu-
lator can source current up to 20mA (typical). To insure
the stability, a 0.1µF ceramic capacitor should be con-
nected from VTTREF to GND.
Soft-Start and Current Limit
The APL5338A monitors the output current, both sourc-
ing and sinking current, and limits the maximum output
current to prevent damages during current overload or
short circuit (shorted from VOUT to GND or VIN)
conditions. The APL5338A provides a soft-start function,
using the constant current to charge the output capacitor
that gives a rapid and linear output voltage rise. If the load
current is above the current limit start-up, the VTT cannot
start successfully.
Table1. The truth table of S3 and S5 pins
STATE
S0
S3
H
S5
H
VTTREF
1
S3 L H
1
S4/5
L
L 0(discharge)
VTT
1
0(high-Z)
0(discharge)
S3, S5 Control
The S3 and S5 signals control the VTT and VTTREF states
and these pins should be connected to SLP_S3 and
SLP_S5 signals respectively. The table1 shows the truth
table of the S3 and S5 pins. When both S3 and S5 are
above the logic threshold voltage, the VTT and VTTREF
are turned on at S0 state. When S3 is low and S5 is high,
the VTT voltage is disabled and left high impedance in
S3 state. When both S3 and S5 are low, the VTT and
VTTREF are turned off and discharged to the ground
through internal MOSFETs during S4/S5 state. (Note that
if the S3 is forced high and S5 is forced low, then VTTREF
is discharged and VTT is at high-Z state. Such condition
is not recommended.)
Thermal Shutdown
A thermal shutdown circuit limits the junction tempera-
ture of the APL5338A. When the junction temperature ex-
ceeds +150oC, the device will turn off the MOSFETs, al-
lowing the device to cool down. The regulator regulates
the output again through initiation of a new soft-start cycle
after the junction temperature cools by 30oC, resulting in
a pulsed output during continuous thermal overload
conditions. The thermal shutdown is designed with a
30oC hysteresis to lower the average junction tempera-
ture during continuous thermal overload conditions, ex-
tending lifetime of the device. For normal operation, de-
vice power dissipation should be externally limited so
that junction temperatures will not exceed +125oC.
Copyright © ANPEC Electronics Corp.
Rev. A.2 - Aug., 2013
11
www.anpec.com.tw
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
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