APW7116 Datasheet, PDF (1/29 Pages) Anpec Electronics Coropration – 3-in-1 Dual PWM Buck and LinearDDR Power Controller

APW7116
3-in-1 Dual PWM Buck and Linear DDR Power Controller
Features
• Provide Synchronous Rectified Buck
PWM Controllers for VDDQ and VMCH
• Integrated Power FETs with VTT Regulator
Source/Sink up to 2.0A
• Drive Low Cost N-Channel Power MOSFETs
• Internal 0.8V Reference Voltage for Adjustable
VDDQ and VMCH
• Thermal Shutdown
• VTT Tracks at Half the Reference Voltage
• Fixed Switching Frequency of 250kHz for VDDQ
and VMCH
• Over-Current Protection and Under-Voltage
Protection for VDDQ and VMCH
• Fully Complies with ACPI Power Sequencing
Specifications
• 180 degrees Phase Shift between VDDQ and
VMCH
• Power-OK Function for VDDQ and VMCH
• Fast Transient Response
- Maximum Duty Cycle 90%
- High-Bandwidth Error Amplifier
• Simple Single-Loop Control Design
- Voltage Mode PWM Control
- External Compensation
• External Soft-Start for VDDQ and VMCH
• Shutdown Function for VDDQ/VTT and VMCH
• Thermally Enhanced TSSOP-24P Package
• Lead Free and Green Devices Available
(RoHS Compliant)
Applications
• DDR Memory and MCH Power Supply
General Description
The APW7116 integrates Dual PWM buck controllers and
an internal linear regulator for DDR memory and MCH
power solution. The two synchronous PWM buck control-
lers drive four N-channel MOSFETs for DDR memory sup-
ply voltage (VDDQ) and MCH regulator. The internal regu-
lator is designed to track at the half of the reference volt-
age with sourcing and sinking current for DDR memory
termination regulator (VTT).
The APW7116 uses the latched BUF_Cut signal and the
POR of the BOOT to comply with ACPI power sequencing
specifications. The two PWM regulators also provide POK
signals to indicate that the regulators are good. The de-
vice also has the phase shift function between the two
PWM controllers. The protection functions of the two PWM
controllers include over-current protection, under-voltage
protection, and external soft-start function. The VTT regu-
lator provides 2A sinking and sourcing current-limit func-
tion and also has thermal shutdown protection.
The TSSOP-24P package with a copper pad provides
excellent thermal impedance is available.
Pin Configuration
COMP1 1
FB1 ²
SS1/EN1 ³
VTTGND ⁴
VTT 5
VDDQ 6
AGND ⁷
VTTFB ⁸
REFSEN ⁹
FB2 ¹⁰
SS2/EN2 11
POK2 12
GND
BOTTOM
SIDE PAD
TSSOP-24P
(TOP VIEW)
24 _PHASE1
23 LGATE1
22 UGATE1
21 _BOOT
20 _VCC
19 COMP2
18 _{BUF_CUT}
17 _UGATE2
16 LGATE2
15 _GND
14 PHASE2
13 POK1
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.
1
Rev. A.4 - Sep., 2009
www.anpec.com.tw