DATASHEET
ISL95210
High Efficiency 5V, 10A Buck Regulator
The ISL95210 is a high-efficiency step-down regulator that can
deliver 10A of output current from a 5V input. The small
4mmx6mm QFN package and only four external components
provide a very small total solution size. Low resistance internal
MOSFETs deliver excellent efficiency and permit full power
operation in a +90°C ambient without airflow.
The regulator operates from an input voltage of 2.97V to 5.5V,
and provides a 0.6% accurate output voltage over the full
operating temperature range. Intersil's patented R4™ control
architecture provides exceptional transient response with no
external compensation components. The output voltage may
be programmed by an internal DAC or by an external resistor
divider (see “Output Voltage Programming” on page 11 for
more details).
Several digital control signals provide flexibility for users that
want additional features. Switching frequency, switching
mode, output voltage margining and daisy-chained power-
good functions are all programmed by these pins. The
ISL95210 also includes comprehensive internal protection for
overvoltage, undervoltage, overcurrent and over-temperature
conditions.
FN6938
Rev 4.00
December 15, 2011
Features
• 10A Continuous Output Current
• 2.97V to 5.5V Input Voltage Range
• Up to 95% Efficiency
• Full Power Operation in +90°C Ambient without Airflow
• R4™ Control Architecture Delivers Excellent Transient
Response Without Compensation
• Pin Selectable Output Voltage Programming
• ±0.6% Output Voltage Accuracy Over Full Operating
Temperature Range
• Programmable Enhanced Light-Load Efficiency Operation
• Output Voltage Margining and Power-good Monitor
• Small 6mmx4mm QFN Package
Applications
• Point-of-Load Power Supplies
• Notebook Computer Power
• General Purpose Power Rail Generation
Related Literature
• See
AN1485,
“ISL95210 10A Integrated FET Regulator
Evaluation Board Setup Procedure”
100
VIN = 5V
VIN
PVCC
CIN
10µF
VCC
EN
PG_IN
FSET
VSEL1
MPCT
MSEL
VSEL0
FCCM
PGOOD
POWER GOOD
95
90
85
LOUT
420nH
+
1µF
AGND
VOUT = 1.2V
EFFICIENCY (%)
ISL95210
PHASE
VOUT
VCC
80
75
70
65
60
CONTROL
SIGNALS
COUT
220µF
PGND
T-PAD
55
50
0
1
2
3
4
5
6
IOUT (A)
7
VIN = 5V
VOUT = 1.2V
FSW = 800kHz
8
9
10
FSW= 800kHz
LOUT = MPC0740LR42C (NEC/TOKIN)
COUT = 2TPLF220M5 (SANYO)
FIGURE 1. 10A DC/DC CONVERTER USING ONLY 4 EXTERNAL
COMPONENTS
FIGURE 2. EFFICIENCY OF CIRCUIT SHOWN IN FIGURE 1
(INCLUDES INDUCTOR LOSSES)
FN6938 Rev 4.00
December 15, 2011
Page 1 of 20
Functional Block Diagram
FCCM
PVCC
VSEL0
SOFT-START
DAC AND
MARGIN LOGIC
MSEL
R4
™
MODULATOR
VIN
FN6938 Rev 4.00
December 15, 2011
Page 2 of 20
ISL95210
VSEL1
MPCT
DEAD-TIME
CONTROL
BANDGAP
UNDERVOLTAGE
OVERVOLTAGE
PROTECTION
FREQUENCY
CONTROL
VCC
POR
THERMAL MONITOR
& PROTECTION
EN
OVERCURRENT
PROTECTION
VOUT
PG_IN
FSET
PGOOD
10Ω
AGND
VCC
PVCC
MONITOR
PGND
& ADAPTIVE
SHOOT-
THROUGH
PROTECTION
PHASE
PGOOD
ISL95210
Pin Configuration
ISL95210
(32 LD QFN)
TOP VIEW
PGOOD
VSEL1
PG_IN
PGND
PGND
PGND
PGND
PGND
VIN
18
VIN
17
16 VIN
15 PVCC
14 PVCC
T-PAD (PGND)
VCC 30
MPCT 31
MSEL 32
1
FCCM
2
FSET
3
EN
4
PHASE
5
PHASE
6
PHASE
7
PHASE
8
PHASE
9
PHASE
10
PHASE
13 PGND
12 PGND
11 DNC
26
VSEL0 27
AGND 28
VOUT 29
25
24
23
22
21
20
19
Functional Pin Descriptions
PIN
T-PAD
(Thermal Pad)
1
2
3
4, 5, 6,
7, 8, 9, 10
11
12, 13, 19,
20, 21, 22, 23
14, 15
NAME
PGND
FCCM
FSET
EN
PHASE
DNC
PGND
PVCC
FUNCTION
Power ground. This thermal pad provides a return path for power stage and switching currents, as well as a thermal path
for removing heat from the IC into the board. Place thermal vias in the pad to the PGND plane.
Logic input for operating mode selection. Connect this pin to VCC for CCM regulation only. Connect this pin to AGND to allow
discontinuous conduction mode for light-load efficiency. Float this pin for audio mode light-load switching.
Tri-state digital input for programming the regulator switching frequency. Pull this pin to VCC for 800kHz switching. Pull this
pin to GND for 400kHz switching. Leave this pin floating for 533kHz switching.
Logic input for enabling and disabling output voltage regulation. Pull this pin to VCC to begin regulation. Pull this pin to AGND
to disable regulation.
Power stage switching node for output voltage regulation. Connect to the output inductor. All PHASE pins must be electrically
connected together on the printed circuit board.
Do not connect. This pin must be left floating under all conditions.
Power ground. This pin provides a return path for power stage and switching currents. All PGND pins must be electrically
connected together on the printed circuit board.
Power input for the integrated MOSFET gate drivers. Connect to a 5V (±10%) supply. Both PVCC pins must be shorted on
the printed circuit board. VIN and PVCC may be tied together (see Figure 1) when operating from a nominal 5V supply.
However, PVCC requires a 5V (±10%) supply irrespective of VIN. It is connected to VCC through an integrated 10 resistor
and therefore doubles as the power supply for IC bias. If VIN is below 4.5V, PVCC must receive a separate power supply
input and decoupling capacitor (1µF typical).
Power input for buck regulation stage. Bypass to PGND with one 10µF or 22µF ceramic capacitor. Connect to a 2.97V to
5.5V supply. All VIN pins must be electrically connected together on the printed circuit board.
Input voltage for the power-good CMOS output. Connect this pin to the desired PGOOD output high level.
Active CMOS output for power-good indication. High state is indicated when the output voltage is in regulation, and output
is logic low otherwise. Logic high level is set by the voltage on the PG_IN pin.
DAC logic MSB input. Used to program preset output voltages of 0.60V, 0.75V, 0.90V, 1.00V, 1.05V, 1.10V, 1.20V, 1.50V,
and 1.80V.
DAC logic LSB input. Used to program preset output voltages of 0.60V, 0.75V, 0.90V, 1.00V, 1.05V, 1.10V, 1.20V, 1.50V,
and 1.80V.
16, 17, 18
24
25
26
27
VIN
PG_IN
PGOOD
VSEL1
VSEL0
FN6938 Rev 4.00
December 15, 2011
Page 3 of 20
ISL95210
Functional Pin Descriptions
(Continued)
PIN
28
29
NAME
AGND
VOUT
FUNCTION
Ground reference for analog signals. Connect this pin to the ground plane.
Sense point for output voltage regulation and output soft-discharge. Connect to the desired regulation point. A resistor divider
can be used to program VOUT away from preset DAC and MARGIN values. However, the divider must not set VOUT more than
5% from the programmed value. See “Output Voltage Programming” on page 11 and Figure 34 for more information on this
implementation.
Power supply input used for regulator bias and precision references. Place a high frequency ceramic capacitor (0.1µF to
1µF) to AGND. PVCC provides power to VCC through an integrated 10 resistor.
3-state logic input for programming the amount of output voltage margining as controlled by the MSEL pin. Pull the pin to
GND for ±15% margining, to VCC for ±20% margining, and float the pin for ±10% margining.
Digital input for control of output voltage margining. Pull this pin to VCC to margin the output voltage to the high value.
Leave this pin floating to margin the output voltage low. Pull this pin to AGND to regulate the nominally programmed output
voltage value. The margin amount is dictated by the MPCT pin.
30
31
32
VCC
MPCT
MSEL
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
ISL95210HRZ
ISL95210IRZ
ISL95210EVAL1Z
NOTES:
1. Add “-T*” suffix for tape and reel. 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 100% matte tin
plate plus anneal (e3 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
ISL95210.
For more information on MSL please see techbrief
TB363.
PART
MARKING
95210 HRZ
95210 IRZ
Evaluation Board
TEMP RANGE
(°C)
-10 to +100
-40 to +100
PACKAGE
(Pb-free)
32 Ld 6x4 QFN
32 Ld 6x4 QFN
PKG.
DWG. #
L32.6x4B
L32.6x4B
FN6938 Rev 4.00
December 15, 2011
Page 4 of 20
ISL95210
Absolute Maximum Ratings
All pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V (DC)
PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -2V to +10V (< 10ns)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 8V (< 10ns)
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
32 Ld QFN Package (Notes 4, 5) . . . . . . . .
40
4
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
Recommended Operating Conditions
VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±10%
PVCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+5V ±10%
VIN Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +2.97V to +5.5V
Junction Temperature (ISL95210HRZ) . . . . . . . . . . . . . . .-10°C to +125°C
Junction Temperature (ISL95210IRZ) . . . . . . . . . . . . . . . .-40°C to +125°C
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 in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief
TB379.
5. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended Operating Conditions, Unless Otherwise Specified. Boldface limits apply over the operating
temperature range (-10°C to +100°C for ISL95210HRZ; -40°C to +100°C for ISL95210IRZ).
PARAMETER
TEST CONDITIONS
MIN
(Note 7)
TYP
MAX
(Note 7) UNITS
BIAS SUPPLIES
Shutdown Supply Current [PVCC]
Switching Supply Current [PVCC]
EN = low, VIN = PVCC = high
EN = high, VCC = high, FSET = GND(400kHz), FCCM = high
EN = high, VCC = high, FSET = FLOAT (533kHz), FCCM = high
EN = high, VCC = high, FSET = high (800kHz), FCCM = high
Standby Supply Current [PVCC]
VCC POR (Power-On Reset) Threshold
EN = high, VCC = high, FCCM = low, IOUT = 0A
VCC rising
VCC falling
4.25
4.00
0.4
7.2
8.9
12.2
1.9
2.7
4.50
4.25
10
µA
mA
mA
mA
mA
V
V
PWM MODULATOR
Oscillator Frequency Accuracy, F
SW
(ISL95210HRZ) FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
T
A
= +25°C
FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
-10°C to +100°C
Oscillator Frequency Accuracy, F
SW
(ISL95210IRZ)
FSET = GND (400kHz)/FLOAT (533kHz)/VCC (800kHz),
-40°C to +100°C
-5
-10
-15
5
10
15
%
%
%
CONTROL THRESHOLDS
EN Rising Threshold
EN Falling Threshold
FCCM, MPCT, MSEL, FSET, VSEL_
Input Low Threshold
FCCM, MPCT, MSEL, FSET, VSEL_
Input Floating Voltage
FCCM, MPCT, MSEL, FSET, VSEL_
Input High Threshold
Input impedance > 1M
1.0
1.20
1.85
2.2
1.50
2.00
2.50
1.80
2.15
2.8
2.0
V
V
V
V
V
FN6938 Rev 4.00
December 15, 2011
Page 5 of 20
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