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PDF TD5860A Data sheet ( Hoja de datos )
| Número de pieza | TD5860A | |
| Descripción | Source and Sink 1.5A/2A Fast Transient Response Line Regulator | |
| Fabricantes | Techcode | |
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T echcode®
DATASHEET
Source and Sink 1.5A/2A Fast Transient Response Line Regulator TD5860(A)
General Description
Features
The TD5860/TD5860A linear regulator is designed to
provide a regulated voltage with bi-direction output
current for DDRSDRAM termination voltage. The
TD5860 integrates two power transistors to source or
sink load current up to 1.5A/2A. It also features internal
soft-start, current-limit, thermal 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
thermal protection against any combination of overload
that would create excessive junction temperatures.
The output voltage of TD5860/TD5860A 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 external 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
enable voltage threshold shuts down the output. The
output of TD5860/TD5860A will be high impedance after
being shut down by VREF or the thermal shutdown
function.
z Provide Bi-direction Output Currents
z Sourcing and Sinking Current up to 1.5A/2A Built-in
Soft-Start
z Power-On-Reset Monitoring on VCNTL and VIN
pins
z Fast Transient Response
z Stable with Ceramic Output Capacitors ±20mV High
System Output Accuracy over Load and
Temperature Ranges
z Adjustable Output Voltage by External Resistors
z Current-Limit Protection
z On-Chip Thermal Shutdown
z Shutdown for Standby or Suspend Mode
z SimpleSOP-8 with Exposed Pad(SOP8-PP)
Packages
z Lead Free and Green Devices Available(RoHS
Compliant)
Applications
z DDRII/III SDRAM Termination Voltage
z Motherboard and VGA Card Power Supplies
z Setop Box
z SSTL-2/3 Termination Voltage
Package Types
Figure 1. Package Types of TD6821
Figure 1 Package Types of TD5860/TD5860A
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
1
1 page  
T echcode®
Source and Sink 1.5A/2A Fast Transient Response Line Regulator
Electrical Characteristics
DATASHEET
TD5860(A)
Refer to the typical application circuit. These specifications apply over VCNTL=5V, VIN=1.8V or 1.5V, VREF=0.5VIN, CIN=10μF, COUT=10μF (MLCC) and TA=
-40~85°C, unless otherwise specified. Typical values are at TA=25°C.
Parameters
Symbol
Test Condition
Min. Typ. Max. Unit
SUPPLY CURRENT
VCNTL Supply Current
ICNTL
IOUT=0A
VREF=0V(Shutdown)
1 2 uA
5 uA
VIN Supply Current at Shutdown
IFB VREF=GND(Shutdown)
5 uA
POWER-ON-RESET(POR)
Rising VCNTL POR Threshold
VCNTL Rising
2.5 2.75 2.9
V
VCNTL POR Hysteresis
0.35 V
Rising VIN POR Threshold
VIN Rising
0.7 0.9 1.05
V
VIN POR Hysteresis
0.3 V
OUTPUT VOLTAGE
VOUT Output Voltage
System Accuracy
VOUT Offset Voltage(VOUT-VREF)
Load Regulation
VOUT
VOS
IOUT=0A,VREF=0.7~2.8V
Over temperature and
load current ranges
IOUT=10mA
IOUT=-10mA
IOUT=10mA~1.5A
IOUT=-10mA~-1.5A
-20
-7
-13
VREF
-1
8
-8
4
20
12
8
V
mV
mV
mV
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
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5 Page 
T echcode®
DATASHEET
Source and Sink 1.5A/2A Fast Transient Response Line Regulator TD5860(A)
Application Information
Power Sequencing
Output Capacitor
The input sequence of powers applied for VIN and
VCNTL is not necessary to be concerned.
Reference Voltage
A reference voltage is applied at the VREF pin by a
resistor divider between VIN and GND pins. An
external bypass capacitor is also connected to VREF.
The capacitor and the resistor divider form a low-pass
filter to reduce the inherent reference noise from VIN.
The capacitor is a 0.1μF or greater ceramic capacitor
and connected as close to VREF as possible. More
capacitance and large resistor divider will increase the
soft-start interval. Do not place any additional loading
on this reference input pin
The TD5860/TD5860A needs a proper output capacitor to
maintain circuit stability and improve transient response. In
order to insure the circuit stability, a 10μF X5R or X7R
MLCC output capacitor is sufficient at all operating
temperatures and it must be placed near the VOUT. The
maximum distance from output capacitor to VOUT must
within 10mm. Total output capacitors value including
MLCC and aluminum electrolytic capacitors should be
larger than 10μF
Table 1 provides the suitable output capacitors for TD5860
Operation Region and Power
Input Capacitor
Dissipation
The TD5860/TD5860A requires proper input
capacitors to supply current surge during stepping
load transients to prevent the input rail from dropping.
Because the parasitic inductors from the voltage
sources or other bulk capacitors to the VIN pin limit
the slew rate of the input current, more parasitic
inductance needs more input capacitance. For the
TD5860, the total capacitance of input capacitors
value including MLCC and aluminum electrolytic
capacitors should be larger than 10μF. For VCNTL
pin, a capacitor of 0.47μF (MLCC) or above is
recommended for noise decoupling.
The TD5860/TD5860A maximum power dissipation
depends on the thermal resistance and temperature
difference between the die junction and ambient air. The
power dissipation PD across the device is:
Where (TJ-TA) is the temperature difference between the
junction and ambient air. θJA is the thermal resistance
between junction and ambient air. Assuming the TA=25oC
and maximum TJ=150oC (typical thermal limit threshold),
the maximum power dissipation is calculated as:
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
11
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| PDF Descargar | [ Datasheet TD5860A.PDF ] | |
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