ADP3209CJCPZ-RL ON Semiconductor, ADP3209CJCPZ-RL Datasheet - Page 19

• Manufacturer Part Number: ADP3209CJCPZ-RL
• Description: IC CTLR BUCK 5BIT 1PH 32LFCSP
• Manufacturer: ON Semiconductor

Specifications of ADP3209CJCPZ-RL

• Applications: Controller, Power Supplies for Next-Generation Intel Processors
• Voltage - Input: 3.3 ~ 22 V
• Number Of Outputs: 1
• Voltage - Output: 0.4 ~ 1.25 V
• Operating Temperature: 0°C ~ 100°C
• Mounting Type: Surface Mount
• Package / Case: 32-LFCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

protection (RVP) function without additional system cost. The
V
CSREF pin voltage drops to less than −300 mV, the ADP3209
triggers the RVP function by setting both DRVH and DRVL
low, thus turning off all MOSFETs. The reverse inductor
currents can be quickly reset to 0 by discharging the built-up
energy in the inductor into the input dc voltage source via the
forward-biased body diode of the high-side MOSFETs. The
RVP function is terminated when the CSREF pin voltage
returns to greater than −100 mV.
Sometimes the crowbar feature inadvertently results in negative
V
results in a very large reverse inductor current. To prevent
damage to the chipset caused from negative voltage, the
ADP3209 maintains its RVP monitoring function even after
OVP latch-off. During OVP latch-off, if the CSREF pin voltage
drops to less than −300 mV, the low-side MOSFETs is turned
off by setting DRVL low. DRVL will be set high again when the
CSREF voltage recovers to greater than −100 mV.
Figure 31 shows the reverse voltage protection function of the
ADP3209. The CSREF pin is disconnected from the output
voltage and pulled negative. As the CSREF pin drops to less
than −300 mV, the low-side and high-side FETs turn off.
OUTPUT ENABLE AND UVLO
For the ADP3209 to begin switching, the VCC supply voltage to
the controller must be greater than the V
EN pin must be driven high. If the VCC voltage is less than the
V
off. In shutdown mode, the controller holds DRVH and DRVL
CCGFX
CCGFX
CCUVLO
voltage is monitored through the CSREF pin. When the
voltage because turning on the low-side MOSFETs
3
2
4
1
threshold or the EN pin is logic low, the ADP3209 shuts
CH1 5.00V
CH3
1.00V
Figure 31. ADP3209 RVP Function
CH2 5.00V
CH4 20.0V
M2.00—s
CSREF
PWRGD
DRVH
DRVL
CCOK
A CH3
threshold and the
580mV
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low, shorts the capacitors of the SS and PGDELAY pins to
ground, and drives PWRGD to low.
The user must adhere to proper power-supply sequencing during
startup and shutdown of the ADP3209. All input pins must be
at ground prior to removing or applying VCC, and all output
pins should be left in high impedance state while VCC is off.
POWER MONITOR FUNCTION
The ADP3209 includes a power monitor function. The PMON
pin is an open-drain MOSFET. A pull-up resistor is required on
PMON. PMON switches at a duty cycle proportional to the load
current. The full-scale duty cycle of PMON at the maximum load
current is set by a resistor, R
GND. R
open-drain transistor.
Connecting an RC to PMON will average the PMON voltage. If
the PMON pull-up resistor is connected to a dc voltage, the average
PMON voltage is proportional to the load current. Figure 32 shows
the PMON function used to monitor load current.
Because the output voltage of the ADP3209 can vary in the
same application, the average PMON voltage is proportional to
the load current, but not to the output power. Connecting the
PMON pull-up resistor to V
voltage that is proportional to the output power.
PMONFS
Figure 32. PMON Current Monitor Configuration
Figure 33. PMON Power Monitor Configuration
PMON
also sets the switching frequency of the PMON
PWM
PMON
PWM
ADP3209
ADP3209
PMONFS
PMONFS
PMON
PMON
PMONFS
CCGFX
6
7
6
7
, connected from PMONFS to
VOLTAGE
results in a PMON average
V
CCGFX
R
DC
R
PMONFS
PMONFS
R
R
R
R
PULL UP
PULL UP
FILTER
FILTER
C
C
FILTER
FILTER
CURRENT
SIGNAL
POWER
SIGNAL