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ADP3161 Arkusz danych(PDF) 6 Page - Analog Devices

Numer części ADP3161
Szczegółowy opis  4-Bit Programmable 2-Phase Synchronous Buck Controller
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ADP3161 Arkusz danych(HTML) 6 Page - Analog Devices

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–6–
REV. 0
ADP3161
the output voltage will droop and cause the PWRGD output to
signal that the output voltage has fallen out of its specified range.
Short Circuit Protection
The ADP3161 has multiple levels of short circuit protection to
ensure fail-safe operation. The sense resistor and the maximum
current sense threshold voltage given in the specifications set the
peak current limit.
When the load current exceeds the current limit, the excess
current discharges the output capacitor. When the output voltage is
below the foldback threshold VFB(LOW), the maximum deliverable
output current is cut by reducing the current sense threshold
from the current limit threshold, VCS(CL), to the foldback
threshold, VCS(FOLD). Along with the resulting current foldback,
the oscillator frequency is reduced by a factor of five when
the output is 0 V. This further reduces the average current in
short circuit.
Power-Good Monitoring
The Power-Good comparator monitors the output voltage of the
supply via the FB pin. The PWRGD pin is an open drain output
whose high level (when connected to a pull-up resistor) indicates
that the output voltage is within the specified range of the nominal
output voltage requested by the VID DAC. PWRGD will go low if
the output is outside this range.
Output Crowbar
The ADP3161 includes a crowbar comparator that senses when
the output voltage rises higher than the specified trip thresh-
old, VCROWBAR. This comparator overrides the control loop and
sets both PWM outputs low. The driver ICs turn off the high side
MOSFETs and turn on the low-side MOSFETs, thus pulling the
output down as the reversed current builds up in the inductors. If
the output overvoltage is due to a short of the high side MOSFET,
this action will current limit the input supply or blow its fuse,
protecting the microprocessor from destruction. The crowbar
comparator releases when the output drops below the specified
reset threshold, and the controller returns to normal operation if
the cause of the overvoltage failure does not persist.
Output Disable
The ADP3161 includes an output disable function that turns off
the control loop to bring the output voltage to 0 V. Because
an extra pin is not available, the disable feature is accomplished
by pulling the COMP pin to ground. When the COMP pin drops
below 0.56 V, the oscillator stops and both PWM signals are
driven low. This function does not place the part in a low quiescent
current shutdown state, and the reference voltage is still available.
The COMP pin should be pulled down with an open collector
or open drain type of output capable of sinking at least 2 mA.
APPLICATION INFORMATION
A VRM 8.4–Compliant Design Example
The design parameters for a typical high-performance Intel
Pentium III CPU application designed to meet Intel’s VRM 8.4
FMB specification (see Figure 1) are as follows:
Input Voltage (VIN) = 5 V
Nominal Output Voltage (VOUT) = 1.8 V
Static Output Voltage Tolerance (V) = (V+) – (V–) = 40 mV –
(–80 mV) = 120 mV
Average Output Voltage (VAVG) = VOUT +
() ( –)
VV
++
2
= 1.780 V
Maximum Output Current (IO) = 26 A
Output Current di/dt < 20 A/
µs.
1
2
3
4
8
7
6
5
BST
IN
DLY
VCC
DRVH
SW
PGND
DRVL
U2
ADP3412
U1
ADP3161
C14 TO C22
C20
VCC(CORE) RTN
D1
MBR052LTI
Q5
2N3904
Q3
IRL3803
Q4
IRL3803
C10
1 F
D2
MBR052LTI
C5
1 F
Z1
ZMM5236BCT
R5
2.4k
R8
330
C24
330pF
C25 1nF
C4
4.7 F
R6
10
C23
15nF
VIN RTN
C26
4.7 F
C6
1 F
C9
1 F
R7
20
R4
4m
R1
1k
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
NC
VID3
VID2
VID1
VID0
COMP
FB
CT
VCC
REF
CS–
PWM1
PWM2
CS+
GND
1
2
3
4
8
7
6
5
BST
IN
DLY
VCC
DRVH
SW
PGND
DRVL
U3
ADP3412
1000 F
9
RUBYCON ZA SERIES
24m
ESR (EACH)
VCC(CORE)
1.3V – 2.05V
26A
C7
15pF
C13
1000 F
16V
C12
1000 F
16V
C11
1000 F
16V
VIN
5V
12V VCC
12V VCC RTN
RA
15.1k
RB
17.8k
C2
740pF
C1
150pF
L1
1 H
+
++
C8
15pF
L2
1 H
RZ
560
COC
2.7nF
NC = NO CONNECT
Q1
IRL3803
Q2
IRL3803
• • •
PWRGD
Figure 1. 26 A Pentium III CPU Supply Circuit


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