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PDF uP1561 Data sheet ( Hoja de datos )
| Número de pieza | uP1561 | |
| Descripción | Synchronous Buck Controller | |
| Fabricantes | uPI Semiconductor | |
| Logotipo |  |
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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
1 page  
S3
S5
MODE
VTTREF
VTTIN
VTT
VTTGND
VTTSNS
VDDQSNS
VDDQSET
COMP
CS
Conceptual
uP1561
Functional Block Diagram
Enable and
Discharge Mode
Select
DDR Mode
Select
VCC5 POK
1.25V
0.75V
Reference
Voltage and POR
Generator
VCC5
POK
VOV
VPOK
OV
VUV UV
VDDQSNS
PHASE
Control
Logic
OVP/UVP/
OCP
Ton/Toff
PVCC5
PVCC5
BOOT
UGATE
PHASE
LGATE
PGND
PWM
OCP
Current Mode
Select and
Control
1.25V
0.75V
0.75V
PHASE
Isense
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C00, File Name: uP1561-DS-C0000
5
5 Page 
Conceptual
uP1561
Electrical Characteristics
Parameter
Symbol
Test Conditions
Min Typ Max Unit
VDDQ Output
Output Voltage, VDDQ
VVDDQ
VVDDQSET = 0V, No load
VVDDQSET = 5V, No load
Adjustable mode, No load
1.477 1.500 1.523
1.776 1.800 1.824
0.75 -- 3.0
V
V
V
VDDQSET Regulation Voltage VVDDQSET Adjustable mode
VVDDQSET = 0V
Input impedance, VDDQSNS RVDDQSNS VVDDQSET = 5V
Adjustable mode
742.5 750.0 757.5 mV
-- 125 -- kΩ
-- 180 -- kΩ
-- 460 -- kΩ
Input Current, VDDQSET
IVDDQSET
VVDDQSET = 0.78V, COMP = Open
VVDDQSET = 0.78V, COMP = 5V
-- -0.04 --
-- -0.06 --
uA
uA
Discharge Current, VDDQ
IVDDQDisch VS3 = VS5 = 0V, VVDDQSNS = 0.5V, VMODE = 0V 10 40
-- mA
Discharge Current, VTTIN
I
V = V = 0V, V
= 0.5V, V = 2.5V 200 400 800 mA
VTTINDisch S3
S5
VDDQSNS
MODE
Trans-Conductance Amplifier
Gain
GM
280 340 400 uS
COMP Maximum Sink Current
COMP maximumsource
current
COMP high clamp voltage
COMP low clamp voltage
Duty Control
ICOMPSNK
VS3 = 0V, VS5 = 5V, VVDDQSET = 0V, VVDDQSNS
= 1.6V, VCOMP = 1.28V
ICOMPSRC
VS3 = 0V, VS5 = 5V, VVDDQSET = 0V, VVDDQSNS
= 1.4V, VCOMP = 1.28V
VCOMPHI
V = 0V, V = 5V, V
= 0V, V
S3
S5
VDDQSET
VDDQSNS
= 1.4V, VCS = 0V
VCOMPLO
VS3 = 0V, VS5 = 5V,
= 1.6V, VCS = 0V
VVDDQSET = 0V, VVDDQSNS
-- 30 -- uA
-- -30 -- uA
1.32 1.35 1.38 V
1.17 1.20 1.23 V
Operating On-Time
Startup On-Time
Minimum On-Time
Minimum Off-Time
Zero Current Comparator
TON
TON0
TON(min)
TOFF(min)
VIN = 12V, VVDDQSET = 0V
VIN = 12V, VVDDQSNS = 0V
-- 300 --
-- 125 --
-- 100 --
-- 350 --
ns
ns
ns
ns
Zero Crossing Comparator
Offset
VZC_OF
-6 0 5 mV
Drivers Output
UGATE Resistance
LGATEL Resistance
Dead Time
RUGATE
R
LGATE
TD
Source, IUGATE = -100 mA
Sink, IUGATE = 100 mA
Source, ILGATE = -100 mA
Sink, ILGATE = 100 mA
PHASE-low to UGATE-on
LGATE-off to UGATE-on
-- 3 6 Ω
-- 0.6 1.2 Ω
-- 1.5 3 Ω
-- 0.6 1.2 Ω
-- 10 -- ns
-- 20 -- ns
uPI Semiconductor Corp., http://www.upi-semi.com
Rev. C00, File Name: uP1561-DS-C0000
11
11 Page | ||
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