DATASHEET
ISL91107IR
High Efficiency Buck-Boost Regulator with 4.1A Switches
The ISL91107IR is a highly-integrated buck-boost switching
regulator that accepts input voltages either above or below the
regulated output voltage. Unlike other buck-boost regulators,
this regulator automatically transitions between operating
modes without significant output disturbance.
This device is capable of delivering up to 2A of output current
(PVIN = 2.8V, V
OUT
= 3.3V) and provides excellent efficiency
due to its fully synchronous 4-switch architecture. No-load
quiescent current of only 45µA also optimizes efficiency under
light load conditions.
The ISL91107IR is designed for standalone applications and
supports 3.3V fixed output voltages or variable output voltages
with an external resistor divider. Output voltages as low as 1V
or as high as 5.2V are supported using an external resistor
divider.
The ISL91107IR requires only a single inductor and very few
external components. Power supply solution size is minimized
by its 2.5MHz switching frequency, allowing small size external
components.
The ISL91107IR is available in a 3x4 20 Ld TQFN package.
FN8687
Rev 0.00
March 2, 2015
Features
• Accepts input voltages above or below regulated output
voltage
• Automatic and seamless transitions between buck and
boost modes
• Input voltage range: 1.8V to 5.5V
• Output current: up to 2A (PVIN = 2.8V, V
OUT
= 3.3V)
• High efficiency: up to 96%
• 45µA quiescent current maximizes light load efficiency
• 2.5MHz switching frequency minimizes external component
size
• Selectable forced PWM mode
• Fully protected for short-circuit, over-temperature and
undervoltage
• Small 3mmx4mm TQFN package
Applications
• Smartphones and tablet PCs
• Wireless communication devices
• Optical modules networking equipment
V
IN
=
1.8V TO 5.5V
C
1
22µF
ISL91107IRTNZ
PVIN
VIN
MODE
EN
LX1
LX2
VOUT
L
1
1µH
EFFICIENCY (%)
100
95
90
V
IN
= 3.6V
V
OUT
= 3.3V
85
80
75
70
65
60
0.001
0.01
0.1
LOAD CURRENT (A)
V
IN
= 2.5V
1.0
3.0
V
IN
= 4.2V
V
IN
= 2.7V
V
IN
= 3V
FB
SGND PGND
C
2
2x22µF
FIGURE 1. TYPICAL ISL91107IRTNZ APPLICATION
FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V
OUT
= 3.3V)
FN8687 Rev 0.00
March 2, 2015
Page 1 of 13
ISL91107IR
Block Diagram
LX1
LX1
LX2
LX2
PVIN
PVIN
VOUT
VOUT
-
+
REVERSE
CURRENT
GATE
GATE DRIVERS
DRIVERS
AND ANTI-
& ANTI-
SHOOT-THRU
SHOOT THRU
EN
EN
VIN
VIN
EN
EN
EN
EN
V
REF
V
REF
E
S
R
E
V
E
R
SOFT
SOFT
DISCHARGE
DISCHARGE
EN
EN
PGND
PGND
T
N
E
R
R
U
C
PVIN
PVIN
MONITOR
MONITOR
THERMAL
THERMAL
SHUTDOWN
SHUTDOWN
MODE
MODE
PWM
PWM
CONTROL
VOUT
VOUT
CLAMP
CLAMP
CONTROL
CURRENT
CURRENT
DETECT
DETECT
EN
EN
EN
VOUT
VOUT
MONITOR
MONITOR
EN
EN
EN
OSC
OSC
+
-
-
+
FB
FB
REF
REF
ERROR
ERROR
AMP
AMP
VOLTAGE
VOLTAGE
PROG.
PROG.
SGND
SGND
FN8687 Rev 0.00
March 2, 2015
Page 2 of 13
ISL91107IR
Pin Configuration
ISL91107IR
(20 LD TQFN)
TOP VIEW
20
VOUT
19
VOUT
18
VOUT
17
VOUT
Pin Descriptions
PIN # PIN NAMES
7, 8, 9,
10
12
5, 6
16
FB
15
SGND
DESCRIPTION
Power input. Range: 1.8V to 5.5V. Connect 22µF
capacitor to PGND.
Supply input. Range: 1.8V to 5.5V.
Inductor connection, input side.
Logic input for enable. Drive HIGH to enable device,
LOW to disable. Do not leave this pin floating
Power ground for high switching current.
Logic input, HIGH for auto PFM mode. LOW for
forced PWM operation. Do not leave this pin
floating
Inductor connection, output side.
Analog ground pin
Buck-boost output. Connect 2x22µF capacitor to
PGND.
Voltage feedback pin.
Thermal pad. Connect to PGND
PVIN
VIN
LX1
EN
PGND
MODE
LX2
1
LX2
2
PGND
3
PGND
4
LX1
5
LX1
6
PVIN
10
13
3, 4
14
THERMAL
PAD
14
MODE
13
EN
12
VIN
11
NC
1, 2
15
17, 18,
19, 20
16
-
LX2
SGND
VOUT
FB
EPAD
7
8
PVIN
PVIN
Ordering Information
PART NUMBER
(Notes
1, 2, 3)
ISL91107IRTNZ (Note
1)
ISL91107IRTAZ (Note
1)
ISL91107IRN-EVZ
ISL91107IRA-EVZ
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 product information page for
ISL91107IR.
For more information on MSL, please see tech brief
TB363.
107N
107A
PART MARKING
VOUT
(V)
3.3
Adj
TEMP RANGE
(°C)
-40 to +85
-40 to +85
PACKAGE
(RoHS Compliant)
20 Ld TQFN
20 Ld TQFN
PKG.
DWG. #
L20.3x4A
L20.3x4A
Evaluation Board for ISL91107IRTNZ for 3.3 Voltage Output
Evaluation Board for ISL91107IRTAZ for ADJ Voltage Output
FN8687 Rev 0.00
March 2, 2015
PVIN
9
Page 3 of 13
ISL91107IR
Absolute Maximum Ratings
PVIN, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
LX1, LX2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
SGND, PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
All Other Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 3kV
Machine Model (Tested per JESD22-A115-A) . . . . . . . . . . . . . . . . . . 250V
Latch-up (Tested per JESD-78B; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°C/W)
3x4mm TQFN Package (Notes
4, 5).
. . . . .
41
5.5
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 (V
IN
) Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 5.5V
Load Current (I
OUT
) Range (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 2A
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
SYMBOL
POWER SUPPLY
VIN
V
UVLO
I
VIN
Input Voltage Range
V
IN
= PVIN = EN = 3.6V, V
OUT
= 3.3V, L
1
= 1µH, C
1
= 1x22µF, C
2
= 2x22µF, T
A
= +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).
PARAMETER
TEST CONDITIONS
MIN
(Note
6)
1.8
Rising
Falling
V
IN
Supply Current
PFM mode, no external load on V
OUT
, no switching,
V
IN
≤
5V
PFM mode, no external load on V
OUT
, with
switching
I
SD
VOUT
V
IN
Supply Current, Shutdown
Output Voltage Accuracy
EN = SGND, V
IN
≤
5V
I
OUT
= 1mA, PWM mode
I
OUT
= 1mA, PFM mode
VFB
VOUT/
VIN
VOUT/
IOUT
VOUT/
VIN
VOUT/
IOUT
V
CLAMP
Feedback Voltage
Line Regulation, PWM Mode
Load Regulation, PWM Mode
Line Regulation, PFM Mode
Load Regulation, PFM Mode
Output Voltage Clamp
For adjustable version only
I
OUT
= 500mA, MODE = SGND, V
IN
step from 2.3V
to 5.5V
V
IN
= 3.7V, MODE = SGND, I
OUT
step from 0mA to
500mA
I
OUT
= 100mA, MODE = V
IN
, V
IN
step from 2.3V to
5.5V
V
IN
= 3.7V, MODE = V
IN
, I
OUT
step from 0mA to
100mA
Rising
5.35
400
-2
-3
0.788
0.8
±0.005
±0.005
±12.5
±0.4
5.85
1.60
1.75
1.71
45
60
0.05
0.6
+2
+4
0.812
µA
%
%
V
mV/mV
mV/mA
mV/V
mV/mA
V
mV
60
TYP
MAX
(Note
6)
5.5
1.795
UNITS
V
V
V
µA
V
IN
Undervoltage Lockout Threshold
OUTPUT VOLTAGE REGULATION
V
CLAMP
_HS Output Voltage Clamp Hysteresis
DC/DC SWITCHING SPECIFICATIONS
f
SW
t
ONMIN
I
PFETLEAK
I
NFETLEAK
Oscillator Frequency
Minimum On Time
LX1 Pin Leakage Current
LX2 Pin Leakage Current
-0.1
-0.1
2.5
≤
V
IN
≤
5V
2.25
2.5
80
2.75
0.1
0.1
MHz
ns
µA
µA
FN8687 Rev 0.00
March 2, 2015
Page 4 of 13
ISL91107IR
Analog Specifications
SYMBOL
V
IN
= PVIN = EN = 3.6V, V
OUT
= 3.3V, L
1
= 1µH, C
1
= 1x22µF, C
2
= 2x22µF, T
A
= +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)
PARAMETER
TEST CONDITIONS
MIN
(Note
6)
TYP
MAX
(Note
6)
UNITS
SOFT-START and SOFT DISCHARGE
t
SS
Soft-start Time
Time from when EN signal asserts to when output
voltage ramp starts.
Time from when output voltage ramp starts to
when output voltage reaches 95% of its nominal
value with device operating in buck mode.
V
IN
= 4V, I
OUT
= 200mA
Time from when output voltage ramp starts to
when output voltage reaches 95% of its nominal
value with device operating in boost mode.
V
IN
= 2V, I
OUT
= 200mA
R
DISCHG
r
DSON_P
R
DSON_N
I
PK_LMT
V
OUT
Soft-discharge ON-resistance
P-channel MOSFET ON-resistance
N-channel MOSFET ON-resistance
P-channel MOSFET Peak Current Limit
V
IN
= 3.6V, EN < V
IL
V
IN
= 3.6V
V
IN
= 3.6V
V
IN
= 3.6V
V
IN
= 3V, V
OUT
= 3.3V
V
IN
= 3V, V
OUT
= 3.3V
3.8
POWER MOSFET
55
47
4.1
4.8
mΩ
mΩ
A
1
1
ms
ms
2
ms
35
Ω
PFM/PWM TRANSITION
Load Current Threshold, PFM to PWM
Load Current Threshold, PWM to PFM
THERMAL SHUTDOWN
Thermal Shutdown
Thermal Shutdown Hysteresis
LOGIC INPUTS
I
LEAK
V
IH
V
IL
Input Leakage
Input HIGH Voltage
Input LOW Voltage
1.4
0.4
0.05
0.1
µA
V
V
150
30
°C
°C
375
300
mA
mA
NOTE:
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.
FN8687 Rev 0.00
March 2, 2015
Page 5 of 13
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