ISL6567CRZ Intersil, ISL6567CRZ Datasheet - Page 9

• Manufacturer Part Number: ISL6567CRZ
• Description: IC CTLR PWM 2PHASE BUCK 24-QFN
• Manufacturer: Intersil

Specifications of ISL6567CRZ

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 1.5MHz
• Duty Cycle: 66%
• Voltage - Supply: 4.9 V ~ 5.5 V
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 24-VQFN
• Frequency-max: 1.5MHz
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

FS (Pin 22)
This pin is used to set the switching frequency. Connect a
resistor, R
the graph in Figure 1 or Equation 2:
R
FS
200k
100k
FIGURE 1. SWITCHING FREQUENCY vs R
VDIFF
50k
COMP
20k
10k
=
R2
R1
C1
FB
10
(
VSEN
FS
100k
10.61
, from this pin to ground and size it according to
FIGURE 2. SIMPLIFIED BLOCK DIAGRAM OF THE ISL6567 VOLTAGE AND CURRENT CONTROL LOOPS
–
(
1.035
200k
REFERENCE
SWITCHING FREQUENCY (Hz)
⋅
log
RGND
(
F
SW
9
)
)
)
500k
Σ
Σ
OSCILLATOR
FS
1M
VALUE
Σ
Σ
2M
(EQ. 2)
AVERAGE
CIRCUIT
CIRCUIT
PWM
PWM
ISL6567
ISL6567
PGOOD (Pin 21)
This pin represents the output of the on-board power-good
monitor. Thus, the FB pin is monitored and compared against
a window centered around the available reference; an FB
voltage within the window disables the open-collector output,
allowing the external resistor to pull-up PGOOD high.
Approximate pull-down device impedance is 65Ω.
While operating with an external reference, the power-good
function is enabled once the MON pin amplitude exceeds its
monitored threshold (typically 300mV).
CURRENT
CURRENT
HALF-BRIDGE
HALF-BRIDGE
SENSE
SENSE
DRIVE
DRIVE
ISL6567
UGATE1
UGATE2
LGATE2
PHASE1
LGATE1
ISEN1
PHASE2
ISEN2
R
ISEN1
R
ISEN2
V
V
IN
IN
L1
L2
C
OUT
May 28, 2009
FN9243.3
V
OUT