ISL62875 Datasheet, PDF (1/22 Pages) Intersil Corporation – PWM DC/DC Controller with VID Inputs for Portable GPU Core-Voltage Regulator

PWM DC/DC Controller with VID Inputs for
Portable GPU Core-Voltage Regulator
ISL62875
The ISL62875 is a Single-Phase Synchronous-Buck
PWM voltage regulator featuring Intersil’s Robust Ripple
Regulator (R³) Technology™. The wide 3.3V to 25V
input voltage range is ideal for systems that run on
battery or AC-adapter power sources. The ISL62875 is a
low-cost solution for applications requiring dynamically
selected slew-rate controlled output voltages. The
soft-start and dynamic setpoint slew-rates are capacitor
programmed. Voltage identification logic-inputs select
four resistor-programmed setpoint reference voltages
that directly set the output voltage of the converter
between 0.5V to 1.5V, and up to 3.3V using a feedback
voltage divider. Robust integrated MOSFET drivers and
Schottky bootstrap diode reduce the implementation
area and component cost.
Intersil’s R³ Technology™ combines the best features of
both fixed-frequency and hysteretic PWM control. The
PWM frequency is 500kHz during static operation,
becoming variable during changes in load, setpoint
voltage, and input voltage when changing between
battery and AC-adapter power. The modulators ability to
change the PWM switching frequency during these
events in conjunction with external loop compensation
produces superior transient response. For maximum
efficiency, the converter automatically enters diode-
emulation mode (DEM) during light-load conditions such
as system standby.
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 3.3V
• Output Load up to 30A
• Extremely Flexible Output Voltage Programmability
- 2-Bit VID Selects Four Independent Setpoint
Voltages
- Simple Resistor Programming of Setpoint Voltages
- Accepts External Setpoint Reference such as DAC
• ±0.75% System Accuracy: -10°C to +100°C
• Fixed 500kHz PWM Frequency in Continuous
Conduction
• Integrated High-current MOSFET Drivers and
Schottky Boot-Strap Diode for Optimal Efficiency
Applications*(see page 21)
• Mobile PC GPU Core Power
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Tablet PCs/Slates and Netbooks
• Hand-Held Portable Instruments
Related Literature*(see page 21)
• TB389 “PCB Land Pattern Design and Surface Mount
Guidelines for QFN Packages”
Typical Application
+5V
GPIO
C_PVCC
1 20
2
PGND
3
GND
4
EN
5
VID1
6
VID0
7 _SREF
8 _SET0
9 _SET1
19
VCC
18
BOOT
17
UGATE
16
PHASE
14
OCSET
13
VO
12
FB
10 11 V_CC
R_SET1 R_SET2 R_SET3
GPIO
C_VCC
QHS
C_BOOT
QLS
V_IN
3.3V TO 25V
CIN
LO
C_OCSET
V_OUT
0.5V TO 3.3V
COUT
R_COMP
RO
C_COMP
R_FB
FN6905.1
September 18, 2009
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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