STEVAL-ISA051V2 STMicroelectronics, STEVAL-ISA051V2 Datasheet - Page 32
![BOARD EVAL PM6670AS DDR2/3](/photos/9/13/91339/steval-isa051v2_sml.jpg)
STEVAL-ISA051V2
Manufacturer Part Number
STEVAL-ISA051V2
Description
BOARD EVAL PM6670AS DDR2/3
Manufacturer
STMicroelectronics
Type
DC/DC Switching Converters, Regulators & Controllersr
Specifications of STEVAL-ISA051V2
Design Resources
STEVAL-ISA051V2 Gerber Files STEVAL-ISA051V2 Schematic STEVAL-ISA051V2 Bill of Material
Main Purpose
Special Purpose DC/DC, DDR Memory Supply
Outputs And Type
4, Non-Isolated
Voltage - Output
1.5V, 1.8V
Voltage - Input
4.5 ~ 36V
Regulator Topology
Buck
Board Type
Fully Populated
Utilized Ic / Part
PM6670A
Input Voltage
4.5 V to 36 V
Output Voltage
1.8 V, 1.5 V
Product
Power Management Modules
Silicon Manufacturer
ST Micro
Silicon Core Number
PM6670AS
Kit Application Type
Power Management
Application Sub Type
DDR2/3 Memory Power Supply Controller
Kit Contents
Board
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Power - Output
-
Frequency - Switching
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
For Use With/related Products
PM6670AS
Other names
497-8412
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
STEVAL-ISA051V2
Manufacturer:
STMicroelectronics
Quantity:
1
Device description
32/53
Figure 36. Soft-start at heavy load (a) and short-circuit (b) conditions, pulse-skip enabled
The soft-start allows a gradual increase of the internal current limit threshold during start-up
reducing the input/output surge currents. At the beginning of start-up, the PM6670AS
current limit is set to 25% of nominal value and the under voltage protection is disabled.
Then, the current limit threshold is sequentially brought to 100% in four steps of
approximately 750 μs (
Figure 35. Soft-start waveforms
After a fixed 3 ms total time, the soft-start finishes and UVP is released: if the output voltage
doesn't reach the Power-Good lower threshold within soft-start duration, the UVP condition
is detected and the device performs a soft end and latches off. Depending on the load
conditions, the inductor current may or may not reach the nominal value of the current limit
during the soft-start (
(a)
Switching output
Figure 36
Figure 35
Current limit threshold
S5
Doc ID 14436 Rev 2
shows two examples).
).
(b)
Time
PM6670AS