BUCK CONTVERTER. APW8861 Datasheet

APW8861 CONTVERTER. Datasheet pdf. Equivalent

Part APW8861
Description DDR3 AND DDR4 SYNCHRONOUS BUCK CONTVERTER
Feature APW8861 DDR3 AND DDR4 SYNCHRONOUS BUCK CONTVERTER WITH 1.5A LDO Features General Description Buc.
Manufacture ANPEC
Datasheet
Download APW8861 Datasheet



APW8861
APW8861
DDR3 AND DDR4 SYNCHRONOUS BUCK CONTVERTER
WITH 1.5A LDO
Features
General Description
Buck Controller (VDDQ)
High Input Voltages Range from 4.5V to 26V Input
Power
Provide Adjustable Output Voltage from 0.75V to
3.3V
Integrated MOSFET Drivers and Bootstrap Forward
P-CH MOSFET
Low Quiescent Current (200uA)
Excellent Load Transient Responses
PFM Mode for Increased Light Load Efficiency
Constant On-Time Controller Scheme
- Switching Frequency Compensation for PWM
Mode
- Adjustable Switching Frequency from 400kHz to
550kHz in PWM Mode with DC Output Current
S3 and S5 Pins Control The Device in S0, S3 or S4/
S5 State
Power Good Monitoring
70% Under-Voltage Protection (UVP)
125% Over-Voltage Protection (OVP)
Adjustable Current-Limit Protection
- Using Sense Low-Side MOSFET’s RDS(ON)
TQFN-32 4mmx4mm Thin package
Lead Free Available (RoHS Compliant)
+1.5A LDO Section (VTT)
Souring or Sinking Current up to 1.5A
Fast Transient Response for Output Voltage
Output Ceramic Capacitors Support at least 10µF
MLCC
VTT and VTTREF Track at Half the VDDQSNS by
internal divider
+20mV Accuracy for VTT and VTTREF
Independent Over-Current Limit (OCL)
Thermal Shutdown Protection
The APW8861 integrates a synchronous buck PWM con-
verter to generate VDDQ, a sourcing and sinking LDO
linear regulator to generate VTT. It offers the lowest total
solution cost in system where space is at a premium.
The APW8861 provides excellent transient response and
accurate DC voltage output in either PFM or PWM Mode.
In Pulse Frequency Mode (PFM), the APW8861 provides
very high efficiency over light to heavy loads with loading-
modulated switching frequencies. On TQFN-32 Package,
the Forced PWM Mode works nearly at constant frequency
for low-noise requirements.
The APW8861 is equipped with accurate current-limit,
output under-voltage, and output over-voltage protections.
A Power-On- Reset function monitors the voltage on VCC
prevents wrong operation during power on.
The LDO is designed to provide a regulated voltage with
bi-directional output current for DDR-SDRAM termination.
The device integrates two power transistors to source or
sink current up to 1.5A. It also incorporates current-limit
and thermal shutdown protection.
The output voltage of LDO tracks the voltage at VREF pin.
An internal resistor divider is used to provide a half volt-
age of VREF for VTTREF and VTT Voltage. The VTT output
voltage is only requiring 20µF of ceramic output capaci-
tance 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 are both pulled low the device provides the soft-off for
VTT and VTTREF.
Applications
DDR3 and DDR4 Memory Power Supplies
SSTL-2 SSTL-18 and HSTL 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.3 - Jan., 2015
1
www.anpec.com.tw



APW8861
APW8861
Simplified Application Circuit
VIN
+4.5V~26V
VDDQ
LOUT
5V
PWM
VCC
RCS Vcc
CS
DDR
LDO
VTT
VDDQ/2
S3 S5
Ordering and Marking Information
APW8861
Lead Free Code
Handling Code
Temperature Range
Package Code
Package Code
QB : TQFN4x4-32
Operating Ambient Temperature Range
I : -40 to 85oC
Handling Code
TR : Tape & Reel
Lead Free Code
G : Halogen and Lead Free Device
APW8861 QB :
APW8861
XXXXX
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Copyright © ANPEC Electronics Corp.
Rev. A.3 - Jan., 2015
2
www.anpec.com.tw







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