ISL6439CB Intersil, ISL6439CB Datasheet - Page 6

• Manufacturer Part Number: ISL6439CB
• Description: IC CNTRLR PWM SYNC BUCK 14-SOIC
• Manufacturer: Intersil

Specifications of ISL6439CB

• Pwm Type: Voltage Mode
• Number Of Outputs: 1
• Frequency - Max: 325kHz
• Duty Cycle: 100%
• Voltage - Supply: 3.3 V ~ 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: 14-SOIC (3.9mm Width), 14-SOL
• Frequency-max: 325kHz
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Electrical Specifications
Functional Pin Description
VCC
This pin provides the bias supply for the ISL6439. Connect a
well-decoupled 3.3V supply to this pin.
COMP and FB
COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the internal
error amplifier and the COMP pin is the error amplifier
output. These pins are used to compensate the voltage-
control feedback loop of the converter.
GND
This pin represents the signal and power ground for the IC.
Tie this pin to the ground island/plane through the lowest
impedance connection available.
GATE DRIVERS
Upper Gate Source Current
Upper Gate Sink Current
Lower Gate Source Current
Lower Gate Sink Current
PROTECTION / DISABLE
OCSET Current Source
Disable Threshold
14 LEAD SOIC
16 LEAD 5x5 QFN
PARAMETER
CPVOUT
OCSET
CPVOUT
CT1
CT2
OCSET
LGATE
GND
CT1
CT2
FB
1
2
3
4
1
2
3
4
5
6
7
16
5
6
15
6
Recommended Operating Conditions, Unless Otherwise Noted V
14
7
I
I
I
I
UGATE-SRC
UGATE-SNK
LGATE-SRC
LGATE-SNK
V
SYMBOL
I
13
DISABLE
8
OCSET
14
13
12
11
10
9
8
UGATE
BOOT
PHASE
VCC
CPGND
ENABLE
COMP
12
11
10
9
PHASE
VCC
CPGND
NC
V
V
Commercial
Industrial
BOOT
VCC
ISL6439, ISL6439A
= 3.3V, V
- V
PHASE
TEST CONDITIONS
LGATE
= 5V, V
PHASE
Connect this pin to the upper MOSFET’s source. This pin is
used to monitor the voltage drop across the upper MOSFET
for overcurrent protection.
UGATE
Connect this pin to the upper MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive
shoot-through protection circuitry to determine when the
upper MOSFET has turned off.
BOOT
This pin provides ground referenced bias voltage to the
upper MOSFET driver. A bootstrap circuit is used to create a
voltage suitable to drive a logic-level N-Channel MOSFET.
LGATE
Connect this pin to the lower MOSFET’s gate. This pin provides
the PWM-controlled gate drive for the lower MOSFET. This pin
is also monitored by the adaptive shoot-through protection
circuitry to determine when the lower MOSFET has turned off.
OCSET
Connect a resistor (R
upper MOSFET (V
source (I
(r
according to Equation 1:
An overcurrent trip cycles the soft-start function.
ENABLE
This pin is the open-collector enable pin. Pulling this pin to a
level below 0.8V will disable the controller. Disabling the
ISL6439 causes the oscillator to stop, the LGATE and
UGATE outputs to be held low, and the softstart circuitry to
re-arm.
= 4V
I
DS(ON)
PEAK
UGATE
=
OCSET
) set the converter overcurrent (OC) trip point
= 4V
I
------------------------------------------------ -
OCSET
r
DS ON
), and the upper MOSFET on-resistance
xR
(
IN
OCSET
CC
). R
OCSET
)
= 3.3V±5% and T
MIN
18
16
OCSET
-
-
-
-
-
) from this pin to the drain of the
, an internal 20μA current
TYP
20
20
-1
-1
1
2
-
A
= +25°C (Continued)
MAX
0.8
22
22
-
-
-
-
November 5, 2008
UNITS
FN9057.5
μA
μA
(EQ. 1)
A
A
A
A
V