PWM DC/DC Controller with VID Inputs for
Portable GPU Core-Voltage Regulator
ISL95870, ISL95870A, ISL95870B
The ISL95870, ISL95870A, ISL95870B ICs are
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 5V
• Precision Regulation
- Proprietary R ™ Frequency Control Loop
- ±0.5% System Accuracy Over -10°C to +100°C
Single-Phase Synchronous-Buck PWM regulators
4
featuring Intersil’s proprietary R Technology™. The wide
3.3V to 25V input voltage range is ideal for systems that
run on battery or AC-adapter power sources. The
ISL95870A and ISL95870B are low-cost solutions 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 (ISL95870A,
ISL95870B) resistor-programmed setpoint reference
voltages that directly set the output voltage of the
converter between 0.5V and 1.5V, and up to 5V with a
feedback voltage divider.
4
• Optimal Transient Response
4
- Intersil’s R ™ Modulator Technology
• Output Remote Sense
• Extremely Flexible Output Voltage Programmability
- 2-Bit VID Selects Four Independent Setpoint
Voltages for ISL95870B
- 2-Bit VID Selects Four Dependent or Three
Independent Setpoint Voltages for ISL95870A
- Simple Resistor Programming of Setpoint Voltages
3
4
Compared with R modulator, the R modulator has
equivalent light-load efficiency, faster transient
performance, accurately regulated frequency control and
all internal compensation. These updates, together with
integrated MOSFET drivers and schottky bootstrap diode,
allow for a high-performance regulator that is highly
compact and needs few external components. The
differential remote sensing for output voltage and
selectable switching frequency are another two new
functions. For maximum efficiency, the converter
automatically enters diode-emulation mode (DEM)
during light-load conditions such as system standby.
• Selectable 300kHz, 500kHz, 600kHz or 1MHz PWM
Frequency in Continuous Conduction
• Automatic Diode Emulation Mode for Highest Efficiency
• Power-Good Monitor for Soft-Start and Fault Detection
Applications*(see page 26)
• Mobile PC Graphical Processing Unit VCC Rail
• Mobile PC I/O Controller Hub (ICH) VCC Rail
• Mobile PC Memory Controller Hub (GMCH) VCC Rail
R
C
VCC
+5V
C
VCC
PVCC
V
IN
3.3V TO 25V
CIN
Q
HS
1
12
11
10
9
GND
RTN
BOOT
R
FB1
RTN1
2
V
UGATE
PHASE
PGOOD
L
OUT
O
0.5V TO 5V
3
4
EN
GPIO
Q
LS
CO
SREF
C
SEN
RTN1
C
BOOT
R
O
0
R
FB
R
OFS
FIGURE 1. ISL95870 APPLICATION SCHEMATIC WITH ONE OUTPUT VOLTAGE SETPOINT AND DCR CURRENT SENSE
December 22, 2009
FN6899.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
1
All other trademarks mentioned are the property of their respective owners.
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