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ISL95870BIRZ-T View Datasheet(PDF) - Intersil

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Description
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ISL95870BIRZ-T Datasheet PDF : 29 Pages
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ISL95870, ISL95870A, ISL95870B
ISL95870 Functional Pin Descriptions
PIN NUMBER SYMBOL
DESCRIPTION
1
GND IC ground for bias supply and signal reference.
2
RTN 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.
3
EN Enable input for the IC. Pulling EN above the rising threshold voltage initializes the soft-start sequence.
4
SREF Soft-start and voltage slew-rate programming capacitor input. Connects internally to the inverting input
of the VSET voltage setpoint amplifier.
5
FSEL 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.
6
FB Voltage feedback sense input. Connects internally to the inverting input of the control-loop error
amplifier. The converter is in regulation when the voltage at the FB pin equals the voltage on the
SREF pin.
7
OCSET Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor ROCSET
connects from this pin to the sense node.
8
VO Output voltage sense input for the R4 modulator. The VO pin also serves as the reference input for
the overcurrent detection circuit.
9
PGOOD Power-good open-drain indicator output. This pin changes to high impedance when the converter is
able to supply regulated voltage.
10
PHASE Return current path for the UGATE high-side MOSFET driver, VIN sense input for the R4 modulator,
and inductor current polarity detector input.
11
UGATE High-side MOSFET gate driver output. Connect to the gate terminal of the high-side MOSFET of the
converter.
12
BOOT 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.
13
VCC Input for the IC bias voltage. Connect +5V to the VCC pin and decouple with at least a MLCC to the
GND pin.
14
PVCC 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.
15
LGATE Low-side MOSFET gate driver output. Connect to the gate terminal of the low-side MOSFET of the
converter.
16
PGND Return current path for the LGATE MOSFET driver. Connect to the source of the low-side MOSFET.
7
FN6899.0
December 22, 2009
 

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