|
|
PDF ISL9110A Data sheet ( Hoja de datos )
| Número de pieza | ISL9110A | |
| Descripción | 1.2A High Efficiency Buck-Boost Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de ISL9110A (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
1.2A High Efficiency Buck-Boost Regulator
ISL9110A
The ISL9110A 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 part is capable of delivering up to 1.2A output current, and
provides excellent efficiency due to its fully synchronous 4-switch
architecture. No-load quiescent current of only 35µA also
optimizes efficiency under light-load conditions. Forced PWM
and/or synchronization to an external clock may also be selected
for noise sensitive applications.
The ISL9110A is designed for standalone applications and
supports 3.3V and 5V 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 ISL9110A requires only a single inductor and very few
external components. Power supply solution size is minimized by
a 2.4mm x 1.6mm WLCSP package and a 2.5MHz switching
frequency, which further reduces the size of external
components.
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 1.2A
• High Efficiency: Up to 95%
• 35µA Quiescent Current Maximizes Light-load Efficiency
• 2.5MHz Switching Frequency Minimizes External Component
Size
• Selectable Forced-PWM Mode and External Synchronization
• Fully Protected for Overcurrent, Over-temperature and
Undervoltage
• Small 2.4mmx1.6mm WLCSP Package
Applications
• Regulated 3.3V from a Single Li-Ion Battery
• Smart Phones and Tablet Computers
• Handheld Devices
• Point-of-Load Regulators
Related Literature
• See AN1750 “ISL9110A Evaluation Board User Guide”
VIN = 1.8V TO 5.5V
C1
10µF
STATUS
OUTPUTS
ISL9110AIITNZ
A1
B1 PVIN
A2
LX1 B2
C1 VIN
D3 MODE
C2 EN
D2 BAT
D1 PG
LX2
VOUT
A4
B4
A5
B5
FB D5
GND
PGND
L1
2.2µH
VOUT = 3.3V/1A
C2
10µF
FIGURE 1. TYPICAL APPLICATION
100
95
90
VIN = 5V
85
80 VIN = 3V
75
70 VOUT = 3.3V
0.01
VIN = 2.5V
0.05
IOUT (A)
0.25
FIGURE 2. EFFICIENCY
1.25
June 8, 2012
FN8299.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL9110A
Absolute Maximum Ratings
PVIN, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
LX1, LX2 (Note 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V
FB (Adjustable Version) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
FB (Fixed VOUT Versions) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -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-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)
θJA (°C/W) θJC (°C/W)
20 Ball WLSCP Package (Notes 4, 5) . . . .
66
1
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . .+125°C
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
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8V to 5.5V
Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.2A
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. θJA 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 θJC, the “case temp” location is taken at the package top center.
6. LX1 and LX2 pins can withstand switching transients of -1.5V for 100ns, and 7V for 20ms.
Analog Specifications VVIN = VPVIN = VEN = 3.6V, VOUT = 3.3V, L1 = 2.2µH, C1 = C2 = 10µF, TA = +25°C. Boldface limits apply over the
operating temperature range, -40°C to +85°C.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN TYP MAX
(Note 7) (Note 8) (Note 7) UNITS
POWER SUPPLY
VIN
VUVLO
Input Voltage Range
VIN Undervoltage Lockout Threshold
Rising
Falling
1.8
1.550
1.725
1.650
5.5
1.775
V
V
V
IVIN VIN Supply Current
ISD VIN Supply Current, Shutdown
OUTPUT VOLTAGE REGULATION
PFM mode, no external load on Vout (Note 9)
EN = GND, VIN = 3.6V
35
0.05
60
1.0
µA
µA
VOUT
Output Voltage Range
Output Voltage Accuracy
VFB
IFB
ΔVOUT/
ΔVIN
ΔVOUT/
ΔIOUT
ΔVOUT/
ΔVI
ΔVOUT/
ΔIOUT
VCLAMP
FB Pin Voltage Regulation
FB Pin Bias Current
Line Regulation, PWM Mode
Load Regulation, PWM Mode
Line Regulation, PFM Mode
Load Regulation, PFM Mode
Output Voltage Clamp
Output Voltage Clamp Hysteresis
DC/DC SWITCHING SPECIFICATIONS
ISL9110AIITAZ, IOUT = 100mA
VIN = 3.7V, VOUT = 3.3V, IOUT = 0mA, PWM mode
VIN = 3.7V, VOUT = 3.3V, IOUT = 1mA, PFM mode
For adjustable output version
For adjustable output version
IOUT = 500mA, VOUT = 3.3V, MODE = GND, VIN step
from 2.3V to 5.5V
VIN = 3.7V, VOUT = 3.3V, MODE = GND, IOUT step
from 0mA to 500mA
IOUT = 100mA, VOUT = 3.3V, MODE = VIN, VIN step
from 2.3V to 5.5V
VIN = 3.7V, VOUT = 3.3V, MODE = VIN, IOUT step from
0mA to 100mA
Rising, VIN = 3.6V
VIN = 3.6V
1.00
-2
-3
0.79
5.25
0.80
±0.005
±0.005
±12.5
±0.4
400
5.20
+2
+4
0.81
1
5.95
V
%
%
V
µA
mV/mV
mV/mA
mV/V
mV/mA
V
mV
fSW
tONMIN
IPFETLEAK
INFETLEAK
Oscillator Frequency
Minimum On Time
LX1 Pin Leakage Current
LX2 Pin Leakage Current
2.25
-1
-1
2.50
80
2.75
1
1
MHz
ns
µA
µA
5 FN8299.1
June 8, 2012
5 Page 
ISL9110A
Functional Description
Functional Overview
Refer to the “Block Diagram” on page 2. The ISL9110A
implements a complete buck boost switching regulator, with
PWM controller, internal switches, references, protection
circuitry, and control inputs.
The PWM controller automatically switches between buck and
boost modes as necessary to maintain a steady output voltage,
with changing input voltages and dynamic external loads.
The ISL9110A provides output-power-good and input-power-good
open-drain status outputs on pins 7 and 8.
Internal Supply and References
Referring to the “Block Diagram” on page 2, the ISL9110A
provides two power input pins. The PVIN pin supplies input power
to the DC/DC converter, while the VIN pin provides 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 low invokes a power-down mode, where most internal device
functions, including input and output power good detection, are
disabled.
Soft Discharge
When the device is disabled by driving EN low, an internal resistor
between VOUT and GND is activated. This internal resistor has a
typical 120Ω resistance.
POR Sequence and Soft-start
Bringing the EN pin 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 typical 1ms delay between assertion of the
EN pin and the start of 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 VOUT voltage. While output voltage
is lower than approximately 20% of the target output voltage,
switching frequency is reduced to a fraction of the normal
switching frequency to aid in producing low duty cycles necessary
to avoid input inrush current spikes. Once the output voltage
exceeds 20% of the target voltage, switching frequency is
increased to its nominal value.
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.
The VOUT ramp time is not constant for all operating conditions.
Soft-start into boost mode will take longer than soft-start into
buck mode. The total soft-start time into buck operating mode is
typically 2ms, whereas the typical soft-start time into boost
mode operating mode is typically 3ms. Increasing the load
current will increase these typical soft-start times.
Overcurrent Protection
When the current in the P-Channel MOSFET is sensed to reach
the current limit for 16 consecutive switching cycles, the internal
protection circuit is triggered, and switching is stopped for
approximately 20ms. The device then performs a soft-start cycle.
If the external output overcurrent condition exists after the
soft-start cycle, the device will again detect 16 consecutive
switching cycles reaching the peak current threshold. The
process will repeat as long as the external overcurrent condition
is present. This behavior is called ‘hiccup mode’.
Short Circuit Protection
The ISL9110A provides short-circuit protection by monitoring the
feedback voltage. When feedback voltage is sensed to be lower
than a certain threshold, the PWM oscillator frequency is
reduced in order to protect the device from damage. The
P-Channel MOSFET peak current limit remains active during this
state.
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 voltage falls below the
UVLO threshold, the regulator is disabled.
PG Status Output
An open drain output-power-good signal is provided in the
ISL9110A. An internal window comparator is used to detect
when VOUT is significantly higher or lower than the target output
voltage. The PG output will be driven low when sensed VOUT
voltage is outside of this ‘power good’ window. When VOUT
voltage is inside the ‘power-good’ window, the PG pin goes Hi-Z.
The PG detection circuit detects this condition by monitoring
voltage on the FB pin. Hysteresis is provided for the upper and
lower PG thresholds to avoid oscillation of the PG output.
BAT Status Output
The ISL9110A provides an open drain input-power-good status
output. The BAT status pin will be driven low when VIN rises above
the VTBMON threshold. The BAT status output goes Hi-Z when
VBAT falls below the VTBMON threshold. Hysteresis is provided for
the VTBMON threshold to avoid oscillation of the BAT output.
Ultrasonic Mode (Available Upon Request)
The ISL9110A provides an ultrasonic mode that can be enabled
during IC manufacturing upon request.
In ultrasonic mode, the PFM switching frequency is forced to be
above the audio frequency range.
This ultrasonic mode applies only to PFM mode operation. When
enabled, the PFM mode switching frequency is forced well above
the audio frequency range (fSW becomes typically 60kHz). This
mode of operation, however, reduces the efficiency at light load.
11 FN8299.1
June 8, 2012
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL9110A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| ISL9110 | (ISL9110 / ISL9112) 1.2A High Efficiency Buck-Boost Regulators |  Intersil Corporation |
| ISL91106 | High Efficiency High Current Buck-Boost Regulator | Intersil |
| ISL91106A | High Efficiency High Current Buck-Boost Regulator | Intersil |
| ISL91107 | High Efficiency Buck-boost Regulator | Intersil |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |