ISL95870AHRUZ-T Intersil, ISL95870AHRUZ-T Datasheet - Page 7

• Manufacturer Part Number: ISL95870AHRUZ-T
• Description: IC CTRLR PWM 1PHASE GPU 20UTQFN
• Manufacturer: Intersil

Specifications of ISL95870AHRUZ-T

• Applications: Controller, GPU Core Power
• Voltage - Input: 3.3 V ~ 25 V
• Number Of Outputs: 1
• Voltage - Output: 0.5 V ~ 5 V
• Operating Temperature: -10°C ~ 100°C
• Mounting Type: *
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ISL95870 Functional Pin Descriptions
PIN NUMBER SYMBOL
10
11
12
13
14
15
16
1
2
4
5
6
7
8
9
3
PGOOD
OCSET
PHASE
UGATE
LGATE
PGND
BOOT
PVCC
SREF
FSEL
GND
RTN
VCC
VO
EN
FB
IC ground for bias supply and signal reference.
Negative remote sense input of V
the same resistor divider should be used at RTN pin, i.e. keep R
Enable input for the IC. Pulling EN above the rising threshold voltage initializes the soft-start sequence.
Soft-start and voltage slew-rate programming capacitor input. Connects internally to the inverting input
of the V
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.
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.
Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor R
connects from this pin to the sense node.
Output voltage sense input for the R
the overcurrent detection circuit.
Power-good open-drain indicator output. This pin changes to high impedance when the converter is
able to supply regulated voltage.
Return current path for the UGATE high-side MOSFET driver, V
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.
7
ISL95870, ISL95870A, ISL95870B
SET
voltage setpoint amplifier.
OUT
. If resistor divider consisting of R
4
modulator. The VO pin also serves as the reference input for
DESCRIPTION
IN
FB1
sense input for the R
=R
FB
FB
and R
, and R
OFS
OFS1
is used at FB pin,
=R
December 22, 2009
4
OFS
modulator,
.
OCSET
FN6899.0