CM3212-02DE ON Semiconductor, CM3212-02DE Datasheet - Page 9

• Manufacturer Part Number: CM3212-02DE
• Description: VDDQ/VTT REGULATOR
• Manufacturer: ON Semiconductor

Specifications of CM3212-02DE

• Applications: Converter, DDR, DDR2
• Voltage - Input: 3 V ~ 3.6 V
• Number Of Outputs: 2
• Voltage - Output: 0.85 ~ 1.4 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-WDFN
• Mounting Style: SMD/SMT
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Adjusting VDDQ Output Voltage
and R2:
where V
R2 = 10 kW for DDR−2 application (V
Shutdown
and could sink/source less than 10 mA. During shutdown, the quiescent current is reduced to less than 0.5 mA, independent
of output load.
to prevent interference with the ADJ pin’s normal operation. When the diode anode is pulled low, or left open, the CM3202−02
is again enabled.
Current Limit and Over−temperature Protection
current to approximately 2 A and V
short circuit, the output current folds back to a lower level (~1 A) until the over−current condition ends. While current limiting
is designed to prevent gross device failure, care should be taken not to exceed the power dissipation ratings of the package.
If the junction temperature of the device exceeds 170°C (typical), the thermal protection circuitry triggers and tri−states both
VDDQ and VTT outputs. Once the junction temperature has cooled to below about 120°C the CM3202−02 returns to normal
operation.
Typical Thermal Characteristics
in the series. The first path is the junction to the case (q
to ambient (q
condition can be estimated by the following thermal equation:
of copper allocated for “heat spreading,” the q
an ambient temperature of 85°C, the available power of the package will be:
The CM3202−02 internal bandgap reference is set at 1.25 V. The V
ADJSD also serves as a shutdown pin. When this is pulled high (SHDN_H), both the VDDQ and the VTT outputs tri−state
It is recommended that a low leakage Schottky diode be placed between the ADJSD Pin and an external shutdown signal
The CM3202−02 features internal current limiting with thermal protection. During normal operation, V
The overall junction to ambient thermal resistance (q
When a CM3202−02 using WDFN8 package is mounted on a double−sided printed circuit board with four square inches
V
T
P
JUNC
DDQ
D
+ 170° C * 85° C
+ V
ADJ
+ T
+ T
55° C W
= 1.25 V. The recommended divider value is R
ADJ
AMB
CA
AMB
) thermal resistance which is dependent on board layout. The final operating junction temperature for any
) P
) P
R1 ) R2
D
D
R2
+ 1.5W
(q
(q
JC
CA
) ) P
)
TT
D
limits the output current to approximately ±2 A. When V
DDQ
APPLICATION INFORMATION (Cont’d)
(q
= 1.8 V, V
CA
JA
)
is approximately 55°C/W. Based on the over temperature limit of 170°C with
http://onsemi.com
TT
JA
JC
= 0.9 V).
) which is defined by the package style and the second path is case
) for device power dissipation (P
9
1
= R
2
DDQ
= 10 kW for DDR−1 application, and R1 = 4.42 kW,
voltage is adjustable by using a resistor divider, R1
D
) primarily consists of two paths
TT
is current limiting into a hard
DDQ
limits the output