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uPI Semiconductor

uP1561 Datasheet Preview

uP1561 Datasheet

Synchronous Buck Controller

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Conceptual
uP1561
Synchronous Buck Controller with 3A VTT LDO
for Memory Power Solution
General Description
Features
The uP1561 is a high performance synchronous buck
controller with 3A source/sink VTT LDO for memory
systems power. It also provides the buffered low noise
reference. The uP1561 has wide operation ranging from
3.0V to 26V for input power and 0.75V~3.0V for memory
output voltage.
The synchronous buck of the uP1561 adopts constant-
on-time PWM scheme that features easy-to-use, low
external component count, fast transient response and
quasi- constant frequency operation over the operation
range or in current mode to support ceramic output
capacitors.
The 3A source/sink VTT LDO has fast transient response,
requiring only two 10uF of ceramic output capacitors. In
addition, the LDO supply input is available externally to
significantly reduce the total power losses. The uP1561
supports all the sleep state controls, in S3 state (suspend
to RAM) VTT is at high-Z and in S4/S5 (suspend to disk)
VDDQ, VTT and VTTREF soft off.
The uP1561 has complete functions including under
voltage protection, over current protection, over voltage
protection, power-up sequencing, power OK output, and
thermal shutdown. The uP1561 is available in VQFN4x4-
24L and WQFN3x3-20L packages.
Applications
Desktop PCs, Notebooks, and Workstations
Microprocessor and Chipset Supplies
DDR3/DDR2 Memory Power Supplies
SSTL-2 SSTL-18 and HSTL Bus Termination
Synchronous Buck Controller (VDDQ)
Wide Input Voltage Range 3.0V to 26V
Fast Load Transient Response
Current Mode Option Supports Ceramic
Output Capacitors
Soft-Off in S4/S5 States
R Current Sensing Technique
DS(ON)
1.5V (DDR3), 1.8V (DDR2) Fixed Output or
Adjustable Output (0.75V to 3.0V)
POK, OVP, and UVP
3A LDO (VTT)
3A Source/Sink Capability
Two 10uF Ceramic Output Capacitors
Support High Z in S3 and Soft-Off in S4/S5
Thermal Shutdown
+20mV Accuracy
Reference Voltage (VTTREF)
+20mV Accuracy
Low Noise +10mA Output
Ordering Information
Order Number Package Type
Remark
uP1561PQAG VQFN4x4-24L
uP1561QQKF WQFN3x3-20L
Note: uPI products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C00, File Name: uP1561-DS-C0000
1




uPI Semiconductor

uP1561 Datasheet Preview

uP1561 Datasheet

Synchronous Buck Controller

No Preview Available !

Conceptual
The symbol arrange same as 74.51116.073
The pin define same as spec.
Pin Define
uP1561
Pin Configuration
24 23 22 21 20 19
VTTGND 1
VTTSNS 2
GND 3
MODE 4
25
PGND
18 PGND
17 CS_GND
16 CS
15 PVCC5
VTTREF 5
COMP 6
14 VCC5
13 POK
7 8 9 10 11 12
Add Pin25
is "PGND"
VQFN4x4 24L
VTTGND 1
VTTSNS 2
GND 3
MODE 4
VTTREF 5
21
GND
15 LGATE
14 PGND
13 CS
12 VCC5
11 POK
WQFN3x320L
Typical Application Circuit
VIN
VTT
VREF
VDDQ
24 23 22 21 20 19
1 VTTGND
2 VTTSNS
3 GND
4 MODE
5 VTTREF
6 COMP
PGND 25
PGND 18
CS_GND 17
CS 16
PVCC5 15
VCC5 14
POK 13
R2
R4
7 8 9 10 11 12
S3 S5
VQFN4x4-24L
POK
5V_IN
R3
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C00, File Name: uP1561-DS-C0000
2


Part Number uP1561
Description Synchronous Buck Controller
Maker uPI Semiconductor
Total Page 17 Pages
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