Renesas ISL9120IRTNZ Compact high efficiency low power buck-boost regulator Datasheet

DATASHEET
ISL9120IR
FN8743
Rev 1.00
February 2, 2016
Compact High Efficiency Low Power Buck-Boost Regulator
The ISL9120IR is a highly integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. This regulator automatically
transitions between buck and boost modes without significant
output disturbance. The ISL9120IR also has automatic bypass
functionality for when the input voltage is generally within 1%
to 2% of the output voltage, there will be a direct bypass
connection between the VIN and VOUT pins. In addition to the
automatic bypass functionality, the ISL9120IR also has a
forced bypass functionality with the use of the BYPS pin.
Features
This device is capable of delivering up to 800mA of output
current (VIN = 2.5V, VOUT = 3.3V) and provides excellent
efficiency due to its adaptive current limit pulse frequency
modulation (PFM) control architecture.
• Adaptive multilevel current limit scheme to optimize
efficiency at low and high currents
The ISL9120IR is designed for stand-alone applications and
supports a 3.3V fixed output voltage or variable output
voltages with an external resistor divider. The forced bypass
power saving mode can be chosen if voltage regulation is not
required. The device consumes less than 3.5µA of current over
the operating temperature range in the forced bypass mode.
The ISL9120IR requires only a single inductor and very few
external components. Power supply solution size is minimized
by a 3mmx3mm 12 Ld TQFN package.
BYPASS
BUCK-BOOST
• Input voltage range: 1.8V to 5.5V
• Selectable forced bypass power saving mode
• Output current: up to 800mA (VIN = 2.5V, VOUT = 3.3V)
• High efficiency: up to 98%
• 41µA quiescent current maximizes light-load efficiency
• Fully protected for over-temperature and undervoltage
• Small 3mmx3mm 12 Ld TQFN package
Applications
• Smartphones and tablets
• Portable consumer and wearable devices
VIN
LX1
LX2
VOUT
EN
FB
BYPS
L1
1µH
VOUT = 3.3V
C2
22µF or 47µF
90
VIN = 4V
85
FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION
VIN = 2.5V
VIN = 3.4V
VIN = 3V
80
75
70
FN8743 Rev 1.00
February 2, 2016
VIN = 3.6V
95
EFFICIENCY (%)
ENABLE
DISABLE
• Automatic and seamless transitions between buck and
boost modes
100
PGND
C1
10µF
• Automatic bypass mode functionality
ISL9120IRNZ
GND
VIN =
1.8V TO 5.5V
• Accepts input voltages above or below regulated output
voltage
1
10
100
OUTPUT CURRENT (mA)
1000
FIGURE 2. EFFICIENCY: VOUT = 3.3V, TA = +25°C
Page 1 of 13
ISL9120IR
Block Diagram
VIN
LX1
LX2
A1
C1
A2
C2
SOFT
DIS CHARGE
-
+
REVERSE
CURRENT
VREF
GATE DRIVERS
AT ANTISHOOT THRU
VOUT
EN
EN
B1 PGND
PVIN
MONITOR
VOUT
CLAMP
THE RMAL
SHUTDOWN
PFM CONTROL
CURRENT
DETECT
EN B2
BYPS A3
VOLTAGE
COMPARATOR
C3
EN
+
VREF
+
ILIM
-
FB
VOLTAGE
PROG.
CURRENT
COMPARATOR
B3
GND
FIGURE 3. BLOCK DIAGRAM
Pin Configuration
10 FB
11 VOUT
12 LX2
ISL9120IR
(12 LD 3x3 TQFN)
TOP VIEW
LX2 1
9 EN
EPAD
PGND 2
VIN 6
VIN 5
7 BYPS
LX1 4
PIN NUMBER
PIN NAME
1, 12
LX2
2
PGND
3, 4
LX1
Inductor connection, input side.
5, 6
VIN
Power supply input. Range: 1.8V to 5.5V.
Connect 1x 10µF capacitor to PGND.
7
BYPS
Bypass mode enable pin. HIGH for bypass
mode. LOW for buck-boost mode.
8
GND
Analog ground pin.
9
EN
Logic input, drive HIGH to enable device.
10
FB
Voltage feedback pin.
11
VOUT
8 GND
LX1 3
FN8743 Rev 1.00
February 2, 2016
Pin Descriptions
DESCRIPTION
Inductor connection, output side.
Power ground for high switching current.
Buck-boost output. Connect 22µF or 47µF
capacitor to PGND.
Page 2 of 13
ISL9120IR
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
VOUT
(V)
TEMP RANGE
(°C)
ISL9120IRTAZ
120A
ADJ.
-40 to +85
12 Ld 3x3 TQFN
L12.3x3A
ISL9120IRTNZ
120N
3.3
-40 to +85
12 Ld 3x3 TQFN
L12.3x3A
ISL9120IRN-EVZ
Evaluation Board for ISL9120IRNZ
ISL9120IRA-EVZ
Evaluation Board for ISL9120IRAZ
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
NOTES:
1. Add “-T*” suffix for 3k unit 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 product information page for ISL9120. For more information on MSL, please see tech brief TB363.
FIGURE 4. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
ISL9120
ISL9120IR
Buck-boost
regulation
Yes
Yes
Bypass
Yes
Yes
Package
1.41x1.41mm 9-Bump
WLCSP
3x3mm 12Ld TQFN
FN8743 Rev 1.00
February 2, 2016
Page 3 of 13
ISL9120IR
Absolute Maximum Ratings
Thermal Information
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
LX1, LX2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
GND, PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
ESD Rating
Human Body Model (Tested per JESD22-A114F) . . . . . . . . . . . . . . .2.5kV
Machine Model (Tested per JESD22-A115C) . . . . . . . . . . . . . . . . . 200V
Charged Device Model (Tested per JESD22-C101F). . . . . . . . . . . . . . 2kV
Latch-Up (Tested per JESD78D; Class 2) . . . . . . . . . . . . . . . . . . . . . . 100mA
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
3x3 TQFN (Notes 4, 5) . . . . . . . . . . . . . . . . .
55
5
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage (VIN) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 5.5V
Load Current (IOUT) Range (DC) . . . . . . . . . . . . . . . . . . . . . . . . 0A to 800mA
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.
Analog Specifications VIN = VEN = 3.6V, VOUT = 3.3V, L1 = 1µH, C1 = 10µF, C2 = 47µF, TA = +25°C. Boldface limits apply across the
recommended operating temperature range, -40°C to +85°C and input voltage range (1.8V to 5.5V).
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
5.5
V
1.790
V
POWER SUPPLY
VIN
VUVLO
Input Voltage Range
VIN Undervoltage Lockout Threshold
1.8
Rising
Falling
IVIN
VIN Supply Current
VOUT = 3.7V (Note 7)
ISD
VIN Supply Current, Shutdown
EN = GND
IBYP
VIN Supply Current, Bypass Mode
BYPS = Logic High, VIN ≤5V
1.725
1.550
1.650
V
41
55
µA
0.005
1
µA
0.8
3.5
µA
1.00
5.20
V
-3
+4
%
OUTPUT VOLTAGE REGULATION
VOUT
Output Voltage Range
ISL9120IRAZ, IOUT = 100mA
Output Voltage Accuracy
VIN = 3.7V, IOUT = 1mA
VFB
FB Pin Voltage Regulation
For adjustable output version (ISL9120IRAZ)
IFB
FB Pin Bias Current
For adjustable output version (ISL9120IRAZ)
Line Regulation, 500mA
IOUT = 500mA, VOUT = 3.3V, VIN step from 2.3V to
5.5V
0.00681
mV/mV
VIN = 3.7V, VOUT = 3.3V, IOUT step from 0mA to
500mA
0.0072
mV/mA
IOUT = 100mA, VOUT = 3.3V, VIN step from 2.3V to
5.5V
0.00273
mV/mV
0.05
mV/mA
VOUT/VIN
VOUT/IOUT Load Regulation, 500mA
VOUT/VI
Line Regulation, 100mA
VOUT/IOUT Load Regulation, 100mA
VCLAMP
Output Voltage Clamp
0.80
0.025
VIN = 3.7V, VOUT = 3.3V, IOUT step from 0mA to
100mA
Rising
V
5.32
Output Voltage Clamp Hysteresis
5.82
400
µA
V
mV
DC/DC SWITCHING SPECIFICATIONS
IPFETLEAK
LX1 Pin Leakage Current
INFETLEAK
LX2 Pin Leakage Current
FN8743 Rev 1.00
February 2, 2016
VIN = 3.6V
-0.05
+0.05
µA
-0.05
+0.05
µA
Page 4 of 13
ISL9120IR
Analog Specifications VIN = VEN = 3.6V, VOUT = 3.3V, L1 = 1µH, C1 = 10µF, C2 = 47µF, TA = +25°C. Boldface limits apply across the
recommended operating temperature range, -40°C to +85°C and input voltage range (1.8V to 5.5V). (Continued)
SYMBOL
PARAMETER
TEST CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNIT
SOFT-START AND SOFT DISCHARGE
tSS
rDISCHG
Soft-Start Time
VOUT Soft-Discharge ON-Resistance
Time from when EN signal asserts to when output
voltage ramp starts.
1
ms
Time from when output voltage ramp starts to when
output voltage reaches 95% of its nominal value
with device operating in buck mode.
VIN = 4V, IOUT = 500mA
1
ms
Time from when output voltage ramp starts to when
output voltage reaches 95% of its nominal value
with device operating in boost mode.
VIN = 3V, IOUT = 500mA
1
ms
EN < VIL
110
Ω
POWER MOSFET
rDSON_P
P-Channel MOSFET ON-Resistance
IOUT = 200mA, measured with internal test mode
63
mΩ
rDSON_N
N-Channel MOSFET ON-Resistance
IOUT = 200mA, measured with internal test mode
63
mΩ
2
A
Thermal Shutdown
150
°C
Thermal Shutdown Hysteresis
35
°C
INDUCTOR PEAK CURRENT LIMIT
ILIM_MAX
Maximum Peak Current Limit
THERMAL PROTECTION
LOGIC INPUTS
ILEAK
Input Leakage
VIH
Input HIGH Voltage
VIL
Input LOW Voltage
0.013
0.500
1.4
µA
V
0.4
V
NOTES:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
7. Quiescent current measurements are taken when the output is not switching.
FN8743 Rev 1.00
February 2, 2016
Page 5 of 13
ISL9120IR
Typical Performance Curves
85
1.5
80
VIN = 3V
QUIESCENT CURRENT (µA)
1.0
VIN = 3.6V
VOUT (%)
0.5
0
VIN = 4V
-0.5
VIN = 2.5V
-1.0
70
65
60
55
-1.5
-2.0
75
1
10
100
OUTPUT CURRENT (mA)
FIGURE 5. OUTPUT VOLTAGE vs LOAD CURRENT
1000
50
1.5
2.0
VOUT (1V/DIV)
VOUT (1V/DIV)
IL (500mA/DIV)
IL (500mA/DIV)
VOUT (1V/DIV)
VOUT (1V/DIV)
IL (500mA/DIV)
IL (500mA/DIV)
FN8743 Rev 1.00
February 2, 2016
4.5
5.0
5.5
400µs/DIV
EN (2V/DIV)
FIGURE 9. SOFT-START (VIN = 3V, VOUT = 3.3V, NO LOAD)
4.0
FIGURE 8. SOFT-START (VIN = 4V, VOUT = 3.3V, 0.5A RLOAD)
EN (2V/DIV)
400µs/DIV
3.5
FIGURE 6. QUIESCENT CURRENT vs INPUT VOLTAGE (EN = HIGH)
EN (2V/DIV)
400µs/DIV
3.0
VIN (V)
EN (2V/DIV)
FIGURE 7. SOFT-START (VIN = 4V, VOUT = 3.3V, NO LOAD)
2.5
400µs/DIV
FIGURE 10. SOFT-START (VIN = 3V, VOUT = 3.3V, 0.5A RLOAD)
Page 6 of 13
ISL9120IR
Typical Performance Curves (Continued)
VIN (1V/DIV)
VOUT (AC, 100mV/DIV)
VOUT (1V/DIV)
IL (1A/DIV)
VBYP (2V/DIV)
ILOAD (200mA/DIV)
400µs/DIV
200µs/DIV
FIGURE 11. 0A TO 0.5A LOAD TRANSIENT (VIN = 4V, VOUT = 3.3V)
FIGURE 12. BYPASS FUNCTIONALITY (VIN = 4V, VOUT = 3.3,
0.5A RLOAD)
VOUT (1V/DIV)
VIN (1V/DIV)
IL (1A/DIV)
VBYP (2V/DIV)
400µs/DIV
FIGURE 13. BYPASS FUNCTIONALITY (VIN = 3V, VOUT = 3.3, 0.5A RLOAD)
FN8743 Rev 1.00
February 2, 2016
Page 7 of 13
ISL9120IR
Functional Description
Functional Overview
Refer to the “Block Diagram” on page 2. The ISL9120IR
implements a complete buck-boost switching regulator with a
PFM controller, internal switches, references, protection circuitry
and control inputs.
The PFM controller automatically switches between buck and
boost modes as necessary to maintain a steady output voltage
with changing input voltages and dynamic external loads.
Internal Supply and References
Referring to the “Block Diagram” on page 2, the VIN pin supplies
input power to the DC/DC converter and also provides the
operating voltage source required for stable VREF generation.
Separate ground pins (GND and PGND) are provided to avoid
problems caused by ground shift due to the high switching
currents.
Enable Input
A master enable pin, EN, allows the device to be enabled. Driving
EN logic low invokes a power-down mode, where most internal
device functions, including input and output power-good
detection, are disabled.
Undervoltage Lockout
The Undervoltage Lockout (UVLO) feature prevents abnormal
operation in the event that the supply voltage is too low to
guarantee proper operation. When the VIN pin voltage falls below
the UVLO threshold, the regulator is disabled.
Thermal Shutdown
A built-in thermal protection feature protects the ISL9120IR if
the die temperature reaches +150°C (typical). At this die
temperature, the regulator is completely shut down. The die
temperature continues to be monitored in this thermal shutdown
mode. When the die temperature falls to +115°C (typical), the
device will resume normal operation.
When exiting thermal shutdown, the ISL9120IR will execute its
soft-start sequence.
Buck-Boost Conversion Topology
The ISL9120IR operates in either buck or boost mode. When
operating in conditions where VIN is close to VOUT, the ISL9120IR
alternates between buck mode, boost mode and automatic
bypass modes of operation as necessary to provide a regulated
output voltage.
L1
LX1
Bypass Input
The BYPS pin allows the device to provide a direct connection
from the VIN pin to the VOUT pin. The connection between the
VIN and VOUT pins is through the external inductor and two
internal power transistors. This function, called forced bypass
mode operation, provides a very low quiescent current state.
For forced bypass mode operation, the minimum time required
while in forced bypass operation is 800µs. Also when exiting
forced bypass operation, the minimum time required before
reentering forced bypass mode operation is 1ms.
Soft Discharge
When the device is disabled by driving EN logic low, an internal
resistor between the VOUT and GND pins is activated. This
internal resistor has a typical resistance of 110Ω.
POR Sequence and Soft-Start
Bringing the EN pin logic high allows the device to power-up. A
number of events occur during the start-up sequence. The internal
voltage reference powers up and stabilizes. The device then starts
operating. There is a 1ms (typical) delay between assertion of the
EN pin and the start of the switching regulator soft-start ramp.
The soft-start feature minimizes output voltage overshoot and
input inrush currents. During soft-start, the reference voltage is
ramped to provide a ramping output voltage.
When the target output voltage is higher than the input voltage,
there will be a transition from buck mode to boost mode during
the soft-start sequence. At the time of this transition, the ramp
rate of the reference voltage is decreased, such that the output
voltage slew rate is decreased. This provides a slower output
voltage slew rate.
FN8743 Rev 1.00
February 2, 2016
SWITCH A
LX2
SWITCH D
VIN
VOUT
SWITCH B
SWITCH C
FIGURE 14. BUCK-BOOST TOPOLOGY
Figure 14 shows a simplified diagram of the internal switches
and external inductor.
PFM Operation
During PFM operation in buck mode, Switch D is continuously
closed and Switch C is continuously open. Switches A and B operate
in discontinuous mode during PFM operation. During PFM operation
in boost mode, the ISL9120IR closes Switch A and Switch C to
ramp-up the current in the inductor. When inductor current reaches
the current limit, the device turns OFF Switches A and C, then turns
ON Switches B and D. With Switches B and D closed, output voltage
increases as the inductor current ramps down.
As shown in Figure 15 on page 9, depending on output current,
there will be multiple PFM pulses to charge up the output capacitor.
These pulses continue until VOUT has reached the upper threshold of
the PFM hysteretic, which is at 1.5% above the nominal output
voltage. Switching then stops and remains stopped until VOUT
decays to the lower threshold of the voltage hysteretic, which is the
nominal output voltage. Then the PFM operation repeats.
Page 8 of 13
ISL9120IR
Variable Peak Current Limit Scheme
To optimize efficiency across the output current range, the
ISL9120IR implements a multi-level current limit scheme with 32
levels between 350mA and 2A. The transition from one level to the
other is determined by the number of pulses in a PFM burst (pulse
count) as shown in Figure 16. At a given peak current limit level, the
pulse count increases as the output current increases. When the
pulse count reaches the upper threshold at the existing current limit,
the current limit will switch to the next higher level. Similarly, if the
pulse count reaches the lower threshold at the existing current limit,
the device will switch to the next lower level of peak current limit. If
the pulse count reaches the upper threshold at the highest current
limit, the current limit will not rise any further. Increasing the
output current beyond this point may cause the output to lose
voltage regulation.
PEAK CURRE NT LIMIT
IL
0
1.015 * VOUT_NOMINAL
VOUT
VOUT_NOMINAL
FIGURE 15. PFM MODE OPERATION CONCEPT
IPK_LMT2
IPK_LMT1
IL
0
tMIN
INCREASING IOUT
IOUT
FIGURE 16. PEAK CURRENT LIMIT STEP UP TRANSITION
FN8743 Rev 1.00
February 2, 2016
Page 9 of 13
ISL9120IR
Forced Bypass Mode Operation
Forced bypass mode operation is intended for applications where
the output regulation is not important but the device quiescent
current consumption is important. One example is when the
buck-boost regulator is providing power to a LDO and the LDO is
in standby mode with near zero output current. Under this
condition, putting the buck-boost regulator in the bypass mode
will have essentially no impact on the LDO but save the 41µA
quiescent current consumption on the buck-boost regulator.
Since the bypass mode is an extreme power saving mode, there
is no overcurrent protection. Therefore, caution must be taken
not to overload or short-circuit the device. Power-up in the bypass
mode is not recommended.
Output Voltage Programming
The ISL9120IR is available in fixed and adjustable output voltage
versions. To use the fixed output version (ISL9120IRNZ), the
VOUT pin must be connected directly to the FB pin.
In the adjustable output voltage version (ISL9120IRAZ), an
external resistor divider is required to program the output
voltage.
VIN
Non-Adjustable Version FB Pin Connection
The fixed output version of the ISL9120IR does not require
external resistors or a capacitor on the FB pin. Simply connect
VOUT to FB, as shown in Figure 18.
ISL9120IRNZ
VIN
LX1
LX2
VOUT
EN
FB
BYPS
L1
1µH
VOUT = 3.3V
C2
22µF or 47µF
FIGURE 18. TYPICAL ISL9120IRNZAPPLICATION
LX1
VOUT
EN
FB
PGND
BYPS
GND
BUCK-BOOST
A small capacitor (C4 in Figure 17) in parallel with resistor R1 is
required to provide the specified load and line regulation. The
suggested value of this capacitor is 22pF for R1 = 187k. An NPO
type capacitor is recommended.
ISL9120IRAZ
LX2
FORCE D BYPASS
Feed-Forward Capacitor Selection
BYPASS
BUCK-BOOST
The adjustable version (ISL9120IRAZ) requires three additional
components to program the output voltage. Two external
resistors program the output voltage and a small capacitor is
added to improve transient response.
(EQ. 1)
When designing a PCB, include a GND guard band around the FB
resistor network to reduce noise and improve accuracy and
stability. Resistors R1 and R2 should be positioned close to the
FB pin. The suggested value of the R1 resistor is 187k.
ENABLE
DISABLE
The fixed-output version (ISL9120IRNZ) requires only three
external power components to implement the buck-boost
converter: an inductor, an input capacitor and an output
capacitor.
ENABLE
DIS ABLE
R 1

V OUT = 0.8V   1 + -------
R 2

C1
10µF
Component Selection
C1
10µF
Equation 1 can be used to derive the R1 and R2 resistor values:
VIN =
1.8V TO 5.5V
Applications Information
VIN =
1.8V TO 5.5V
Setting and controlling the output voltage of the ISL9120IRAZ
(adjustable output version) can be accomplished by selecting the
external resistor values.
PGND
When the output voltage is close to the input voltage, generally
within 1% to 2%, the ISL9120IR will engage automatic bypass
mode operation, which produces a direct connection between
the VIN and VOUT pins. This behavior provides excellent efficiency
and very low output voltage ripple.
Output Voltage Programming, Adjustable
Version
GND
Automatic Bypass Mode Operation
L1
1µH
VOUT = 3.3V
C4
R1
187kΩ 22pF
R2
60.4kΩ
C2
47µF
FIGURE 17. TYPICAL ISL9120IRAZ APPLICATION
FN8743 Rev 1.00
February 2, 2016
Page 10 of 13
ISL9120IR
Inductor Selection
Capacitor Selection
An inductor with high frequency core material (e.g., ferrite core)
should be used to minimize core losses and provide good
efficiency. The inductor must be able to handle the peak
switching currents without saturating.
The input and output capacitors should be ceramic X5R type with
low ESL and ESR. The recommended input capacitor value is
10µF. The recommended 10µF input capacitor should have the
following minimum characteristics: 0603 case size, X5R
temperature range and 10V voltage rating. The recommended
VOUT capacitor values are 22µF or 47µF. The recommended
47µF output capacitor should have the following minimum
characteristics: 0603 case size, X5R temperature range and 6.3V
voltage rating. The recommended 22µF output capacitor should
have the following minimum characteristics: 0603 case size,
X5R temperature range and 10V voltage rating.
A 1µH inductor with ≥2A saturation current rating is
recommended. Select an inductor with low DCR to provide good
efficiency. In applications where radiated noise must be
minimized, a toroidal or shielded inductor can be used.
TABLE 1. INDUCTOR VENDOR INFORMATION
MANUFACTURER
SERIES
DIMENSION
(mm)
DCR
(mΩ)
TYP
ISAT
(A)
TYP
Toko
DFE201610R-H1R0M
2.0x1.6x1.0
66
2.7
Cyntec
PIFE20161T-1R0MS 2.0x1.6x1.0
65
2.8
3.8
TDK
TFM201610GHM1R0MTAA
2.0x1.6x1.0
50
TABLE 2. CAPACITOR VENDOR INFORMATION
MANUFACTURER
AVX
SERIES
WEBSITE
X5R
www.avx.com
Murata
X5R
www.murata.com
TDK
X5R
www.tdk.com
Recommended PCB Layout
A correct PCB layout is critical for proper operation of the
ISL9120IR. The input and output capacitors should be positioned
as closely to the IC as possible. The ground connections of the
input and output capacitors should be kept as short as possible
and should be on the component layer to avoid problems that are
caused by high switching currents flowing through PCB vias.
FN8743 Rev 1.00
February 2, 2016
Page 11 of 13
ISL9120IR
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest revision.
DATE
REVISION
CHANGE
February 2, 2016
FN8743.1
-page 1 - In “Description”, 3rd paragraph changed the value from 1µA to 3.5µA.
-ordering information table on page 3, note1: Added “-T” suffix for 3k unit Tape and Reel options.
-Analog specification table changes on page 4 are:
Under power supplyVIN Undervoltage Lockout Threshold, changed max value from 1.775 to 1.79
VIN Supply Current, Bypass Mode changed Typ from 0.035 to 0.8 and max from 1 to 3.5.
under output voltage regulationOutput Voltage Accuracy, changed Min/Max from -2 and +2 to -3 and +4.
August 4, 2015
FN8743.0
Initial Release
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support
© Copyright Intersil Americas LLC 2015-2016. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil may modify the circuit design and/or specifications of products at any time without notice, provided that such
modification does not, in Intersil's sole judgment, affect the form, fit or function of the product. Accordingly, the reader is cautioned to verify that datasheets are
current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its
subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
FN8743 Rev 1.00
February 2, 2016
Page 12 of 13
ISL9120IR
Package Outline Drawing
L12.3x3A
12 LEAD THIN QUAD FLAT NO LEAD PLASTIC PACKAGE
Rev 0, 09/07
3.00
0.5
BSC
A
B
6
12
10
PIN #1 INDEX AREA
6
PIN 1
INDEX AREA
1
4X 1.45
3.00
9
7
3
0.10 M C A B
(4X)
0.15
4
6
0.25 +0.05 / -0.07
4
12X 0 . 4 ± 0 . 1
TOP VIEW
BOTTOM VIEW
SEE DETAIL "X"
0.10 C
0 . 75
C
BASE PLANE
( 2 . 8 TYP )
1.45 )
SEATING PLANE
0.08 C
(
SIDE VIEW
0.6
C
0 . 50
0 . 2 REF
5
0 . 00 MIN.
0 . 05 MAX.
0 . 25
TYPICAL RECOMMENDED LAND PATTERN
DETAIL "X"
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSE Y14.5m-1994.
3. Unless otherwise specified, tolerance : Decimal ± 0.05
4. Dimension b applies to the metallized terminal and is measured
between 0.18mm and 0.30mm from the terminal tip.
5. Tiebar shown (if present) is a non-functional feature.
6. The configuration of the pin #1 identifier is optional, but must be
located within the zone indicated. The pin #1 indentifier may be
either a mold or mark feature.
FN8743 Rev 1.00
February 2, 2016
Page 13 of 13