Source and Sink, 2A, Fast Transient Response Linear Regulator
• Provide Bi-direction Current
- Sourcing or Sinking Current Up to 2A
• Built-in Soft-Start
• Power-On-Reset Monitoring on VCNTL Pins
• Fast Transient Response
• Stable with Ceramic Output Capacitors
• ±10mV 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
• Lead Free and Green Devices Available
• DDRII/III/IV SDRAM Termination Voltage
• Motherboard and VGA Card Power Supplies
• Setop Box
• Low Power DDR3 DDRIII/IV
The APL5337 linear regulator is designed to provide a
regulated voltage with bi-direction output current for DDR-
SDRAM termination voltage. The APL5337 integrates two
power transistors to source or sink load current up to 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 ther-
mal protection against any combination of overload that
would create excessive junction temperatures.
The output voltage of APL5337 is regulated to track the
voltage on VREF pin. A 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 an 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 APL5337 will be high impedance after being shut down
by VREF or the thermal shutdown function.
Simplified Application Circuit
1 VIN VCNTL 6
3 VREF VOUT 4
0.9V / 0.75V
Top View of SOP-8
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.6 - Aug., 2017