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ISL95870BIRZ View Datasheet(PDF) - Intersil

Part Name
Description
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ISL95870BIRZ Datasheet PDF : 29 Pages
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ISL95870, ISL95870A, ISL95870B
ISL95870B Functional Pin Descriptions
PIN NUMBER
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
Bottom Pad
SYMBOL
RTN
VID1
VID0
SREF
SET0
SET1
SET2
FB
OCSET
VO
FSEL
PGOOD
EN
PHASE
UGATE
BOOT
VCC
PVCC
LGATE
PGND
GND
DESCRIPTION
Negative remote sense input of VOUT. If resistor divider consisting of RFB and ROFS is used at FB
pin, the same resistor divider should be used at RTN pin, i.e. keep RFB1=RFB, and ROFS1=ROFS.
Logic input for setpoint voltage selector. Use in conjunction with the VID0 pin to select among four
setpoint reference voltages.
Logic input for setpoint voltage selector. Use in conjunction with the VID1 pin to select among four
setpoint reference voltages.
Soft-start and voltage slew-rate programming capacitor input and setpoint reference voltage
programming resistor input. Connects internally to the inverting input of the VSET voltage setpoint
amplifier.
Voltage set-point programming resistor input.
Voltage set-point programming resistor input.
Voltage set-point programming resistor input.
Voltage feedback sense input. Connects internally to the inverting input of the control-loop error
transconductance amplifier. The converter is in regulation when the voltage at the FB pin equals
the voltage on the SREF pin.
Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor ROCSET
connects from this pin to the sense node.
Output voltage sense input for the R4 modulator. The VO pin also serves as the reference input
for the overcurrent detection circuit.
Input for programming the regulator switching frequency. Pull this pin to VCC for 1MHz switching.
Pull this pin to GND with a 100kΩ resistor for 600kHz switching. Leave this pin floating for 500kHz
switching. Pull this pin directly to GND for 300kHz switching.
Power-good open-drain indicator output. This pin changes to high impedance when the converter
is able to supply regulated voltage.
Enable input for the IC. Pulling EN above the rising threshold voltage initializes the soft-start sequence.
Return current path for the UGATE high-side MOSFET driver, VIN sense input for the R4 modulator,
and inductor current polarity detector input.
High-side MOSFET gate driver output. Connect to the gate terminal of the high-side MOSFET of
the converter.
Positive input supply for the UGATE high-side MOSFET gate driver. The BOOT pin is internally
connected to the cathode of the Schottky boot-strap diode. Connect an MLCC between the BOOT
pin and the PHASE pin.
Input for the IC bias voltage. Connect +5V to the VCC pin and decouple with at least a MLCC to
the GND pin.
Input for the LGATE and UGATE MOSFET driver circuits. The PVCC pin is internally connected to
the anode of the Schottky boot-strap diode. Connect +5V to the PVCC pin and decouple with a
MLCC to the PGND pin.
Low-side MOSFET gate driver output. Connect to the gate terminal of the low-side MOSFET of the
converter.
Return current path for the LGATE MOSFET driver. Connect to the source of the low-side MOSFET.
IC ground for bias supply and signal reference.
9
FN6899.0
December 22, 2009
 

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