DATASHEET
ISL78210
Automotive PWM DC/DC Voltage Controller
The ISL78210 IC is a Single-Phase Synchronous-Buck PWM
voltage controller featuring Intersil’s Robust Ripple Regulator
(R3™) Technology. The ISL78210 provides a low cost solution
for compact high performance applications. The wide 3.3V to
25V input voltage range is ideal for systems that run on battery
or AC adapter power sources. Resistor programmed output
voltage setpoint and capacitor programmed soft-start delay
allow for fast and easy implementation. Robust integrated
MOSFET drivers and Schottky bootstrap diode reduce the
implementation area and lower component cost.
Intersil’s R3 Technology™ combines the best features of both
fixed-frequency and hysteretic PWM control. The PWM
frequency is 300kHz 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.
FN7583
Rev 1.00
December 4, 2013
Features
• Input Voltage Range: 3.3V to 25V
• Output Voltage Range: 0.5V to 3.3V
• Output Load to 30A
• Simple Resistor Programming for Output Voltage
• ±0.75% System Accuracy: -40°C to +105°C
• Capacitor Programming for Soft-Start Delay
• Fixed 300kHz PWM Frequency in Continuous Conduction
• External Compensation Affords Optimum Control Loop Tuning
• Automatic Diode Emulation Mode for Highest Efficiency
• Integrated High-Current MOSFET Drivers and Schottky
Boot-Strap Diode for Optimal Efficiency
• Choice of Overcurrent Detection Schemes
- Lossless Inductor DCR Current Sensing
- Precision Resistive Current Sensing
• Power-Good Monitor for Soft-Start and Fault Detection
• Fault Protection
- Undervoltage
- Overvoltage
- Overcurrent (DCR-Sense or Resistive-Sense Capability)
- Over-Temperature Protection
- Fault Identification by PGOOD Pull-Down Resistance
• Fully AEC-Q100 tested
• Pb-Free (RoHS Compliant)
Pin Configuration
ISL78210
(16 LD 2.6X1.8 µTQFN)
TOP VIEW
16 PGND
15 LGATE
14 PVCC
13 VCC
GND 1
EN 2
NC 3
SREF 4
NC 5
PGOOD 6
FB 7
12 BOOT
11 UGATE
10 PHASE
9 OCSET
VO 8
Applications
• Automotive PC Graphical Processing Unit VCC Rail
• Automotive PC I/O Controller Hub (ICH) VCC Rail
• Automotive PC Memory Controller Hub (GMCH) VCC Rail
FN7583 Rev 1.00
December 4, 2013
Page 1 of 17
ISL78210
Pin Descriptions
PIN
1
2
3, 5
4
6
SYMBOL
GND
EN
NC
SREF
PGOOD
IC ground for bias supply and signal reference.
Enable input for the IC. Pulling EN above the VENTHR rising threshold voltage initializes the soft-start
sequence.
No internal connection. Pins 3 and 5 should be connected to the GND pin.
Soft-start programming capacitor input. Connects internally to the inverting input of the VSET voltage
setpoint amplifier.
Power-good open-drain indicator output. This pin changes to high impedance when the converter is able
to supply regulated voltage. The pull-down resistance between the PGOOD pin and the GND pin identifies
which protective fault has shut down the regulator. See Table 1 on page 10.
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. The control loop compensation network connects between the FB pin and the converter output. See
Figure 8 on page 11.
Output voltage sense input for the R3 modulator. The VO pin also serves as the reference input for the
overcurrent detection circuit. See Figure 5 on page 7.
Input for the overcurrent detection circuit. The overcurrent setpoint programming resistor ROCSET
connects from this pin to the sense node. See “OVERCURRENT PROGRAMMING CIRCUIT” on page 7.
Return current path for the UGATE high-side MOSFET driver. VIN sense input for the R3 modulator.
Inductor current polarity detector input. Connect to junction of output inductor, high-side MOSFET, and
low-side MOSFET. See “Application Schematics” on page 4 (Figures 2 and 3).
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 1µF MLCC to the
GND pin. See “Application Schematics” on page 4 (Figures 2 and 3).
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 10µF MLCC to the
PGND pin. See “Application Schematics” on page 4 (Figures 2 and 3).
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.
DESCRIPTION
7
FB
8
9
10
VO
OCSET
PHASE
11
12
UGATE
BOOT
13
14
VCC
PVCC
15
16
LGATE
PGND
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL78210ARUZ-T
GAT
PART
MARKING
TEMP RANGE
(°C)
-40 to +105
PACKAGE
Tape & Reel
(Pb-Free)
16 Ld 2.6x1.8 µTQFN
PKG.
DWG. #
L16.2.6x1.8A
1. Please refer to
TB347
for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and NiPdAu plate
- e4 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for
ISL78210.
For more information on MSL please see techbrief
TB363.
FN7583 Rev 1.00
December 4, 2013
Page 2 of 17
Block Diagram
EN
VCC
100k
FN7583 Rev 1.00
December 4, 2013
Page 3 of 17
ISL78210
POR
FB
EA
V
COMP
FAULT
100pF
V
W
H
L
IN
RUN
RUN
PWM
DRIVER
BOOT
UGATE
PHASE
PVCC
OTP
PWM
SHOOT-THROUGH
PROTECTION
RUN
VCC
g
m
V
IN
DRIVER
LGATE
PGND
VSET
C
r
V
R
SREF
g
m
V
O
OVP
FB
UVP
FAULT
OCP
I
OCSET
10µF
VO
OCSET
VREF
GND
500mV
PGOOD
FIGURE 1. SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OF ISL78210
ISL78210
Application Schematics
R
VCC
+5V
C
PVCC
LGATE
PGND
PVCC
C
VCC
VIN
3.3V TO 25V
VCC
CIN
C
BOOT
UGATE
PHASE
OCSET
C
BOOT
Q
LS
R
OCSET
C
OCSET
Q
HS
L
O
VOUT
0.5V TO 3.3V
CO
C
CO
B
CIN
B
16
15
14
7
FB
GND
EN
GPIO
NC
SREF
1
2
3
4
5
6
PGOOD
VO
NC
8
13
12
11
10
9
R
O
R
COMP
C
COMP
C
SOFT
VCC
R
PGOOD
R
OFS
R
FB
GPIO
FIGURE 2. ISL78210 APPLICATION SCHEMATIC WITH DCR CURRENT SENSE
R
VCC
+5V
C
PVCC
LGATE
PGND
PVCC
C
VCC
VIN
3.3V TO 25V
VCC
CIN
C
BOOT
UGATE
PHASE
OCSET
C
BOOT
Q
LS
R
OCSET
C
OCSET
Q
HS
L
O
R
SNS
VOUT
0.5V TO 3.3V
CO
C
CO
B
CIN
B
16
15
14
7
FB
GND
EN
GPIO
NC
SREF
1
2
3
4
5
6
PGOOD
NC
VO
8
13
12
11
10
9
R
O
R
COMP
C
COMP
C
SOFT
VCC
R
PGOOD
R
OFS
R
FB
GPIO
FIGURE 3. ISL78210 APPLICATION SCHEMATIC WITH RESISTOR CURRENT SENSE
FN7583 Rev 1.00
December 4, 2013
Page 4 of 17
ISL78210
Absolute Maximum Ratings
VCC, PVCC, PGOOD to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
VCC, PVCC to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +7.0V
GND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
EN, VO, FB, OCSET, SREF . . . . . . . . . . . . . . . . . . . . -0.3V to GND, VCC +0.3V
BOOT Voltage (V
BOOT-GND
) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 33V
BOOT To PHASE Voltage (V
BOOT-PHASE
). . . . . . . . . . . . . . . . -0.3V to 7V (DC)
-0.3V to 9V (<10ns)
PHASE Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 28V
GND -8V (<20ns Pulse Width, 10µJ)
UGATE Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . V
PHASE
- 0.3V (DC) to V
BOOT
V
PHASE
- 5V (<20ns Pulse Width, 10µJ) to V
BOOT
LGATE Voltage . . . . . . . . . . . . . . . . . . . . . . . . .GND - 0.3V (DC) to VCC + 0.3V
GND - 2.5V (<20ns Pulse Width, 5µJ) to VCC + 0.3V
ESD Rating
Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3000V
Machine Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250V
Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000V
Latch Up (Tested per JESD-78A)
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
16 Ld µTQFN Package (Notes 4, 5) . . . . . .
110
4.3
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-55°C to +150°C
Operating Temperature Range . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
Converter Input Voltage to GND . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V to 25V
VCC, PVCC to GND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±5%
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4.
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER
VCC and PVCC
VCC Input Bias Current
VCC Shutdown Current
PVCC Shutdown Current
VCC POR THRESHOLD
Rising VCC POR Threshold Voltage
Falling VCC POR Threshold Voltage
REGULATION
Reference Voltage
System Accuracy
PWM
Switching Frequency
VO
VO Input Voltage Range
VO Input Impedance
VO Reference Offset Current
VO Input Leakage Current
ERROR AMPLIFIER
FB Input Bias Current
SREF
SREF Voltage
Soft-Start Current
These specifications apply for T
A
= -40°C to +105°C, unless otherwise stated. All typical specifications
T
A
= +25°C, VCC = 5V. Boldface limits apply over the operating temperature range, -40°C to +105°C.
SYMBOL
I
VCC
I
VCCoff
I
PVCCoff
V
VCC_THR
V
VCC_THF
TEST CONDITIONS
EN = 5V, VCC = 5V, FB = 0.55V, SREF<FB
EN = GND, VCC = 5V
EN = GND, PVCC = 5V
MIN
(Note 6)
-
-
-
4.37
4.10
-
TYP
1.1
0.1
0.1
4.49
4.22
0.50
-
300
-
600
10
.1
-
0.5
20
MAX
(Note 6)
1.5
1.0
1.0
4.60
4.35
-
+0.75
330
3.6
-
-
-
+50
-
30
UNIT
mA
µA
µA
V
V
V
%
kHz
V
k
µA
µA
nA
V
µA
V
REF(int)
PWM Mode = CCM
F
SW
V
VO
R
VO
I
VOSS
I
VOoff
I
FB
V
SREF
I
SS
EN = 5V
V
ENTHR
< EN, SREF = Soft-Start Mode
EN = GND, VO = 3.6V
EN = 5V, FB = 0.50V
PWM Mode = CCM
-0.75
270
0
-
-
-
-20
-
10
FN7583 Rev 1.00
December 4, 2013
Page 5 of 17
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