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PDF ISL8013A Data sheet ( Hoja de datos )
| Número de pieza | ISL8013A | |
| Descripción | 3A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil Corporation | |
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DATASHEET
3A Low Quiescent Current 1MHz High Efficiency
Synchronous Buck Regulator
ISL8013A
The ISL8013A is a high efficiency, monolithic, synchronous
step-down DC/DC converter that can deliver up to 3A
continuous output current from a 2.8V to 5.5V input supply. It
uses a current control architecture to deliver very low duty
cycle operation at high frequency with fast transient response
and excellent loop stability.
The ISL8013A integrates a pair of low ON-resistance
P-Channel and N-Channel internal MOSFETs to maximize
efficiency and minimize external component count. The 100%
duty-cycle operation allows less than 300mV dropout voltage
at 3A output current. High 1MHz pulse-width modulation
(PWM) switching frequency allows for the use of small external
components and the SYNC input enables multiple ICs to
synchronize out-of-phase to reduce ripple and eliminate beat
frequencies.
The ISL8013A can be configured for discontinuous or forced
continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides high efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal hiccup mode current
limiting during short circuit and overcurrent conditions, an
output overvoltage comparator and over-temperature monitor
circuit. A power-good output voltage monitor indicates when
the output is in regulation.
The ISL8013A is offered in a space saving 4mmx4mm, Pb-free
QFN package with exposed pad leadframes for low thermal
resistance.
The ISL8013A includes a pair of low ON-resistance P-Channel
and N-Channel internal MOSFETs to maximize efficiency and
minimize external component count. The 100% duty-cycle
operation allows less than 300mV dropout voltage at 3A.
The ISL8013A offers a 1ms Power-Good (PG) timer at
power-up. When shut down, ISL8013A discharges the output
capacitor. Other features include internal soft-start, internal
compensation, overcurrent protection, and thermal shutdown.
The ISL8013A is offered in a 4mmx4mm 16 Ld QFN package
with 1mm maximum height. The complete converter occupies
less than 0.4in2 area.
Features
• High efficiency synchronous buck regulator with up to 97%
efficiency
• Power-good (PG) output with a 1ms delay
• 2.8V to 5.5V supply voltage
• 3% output accuracy over temperature, load, line
• 3A output current
• Start-up with prebiased output
• Internal soft-start - 1ms
• Soft-stop output discharge during disable
• 35µA quiescent supply current in PFM mode
• Selectable forced PWM mode and PFM mode
• External synchronization up to 4MHz
• Less than 1µA logic controlled shutdown current
• 100% maximum duty cycle
• Internal current mode compensation
• Peak current limiting and hiccup mode short-circuit
protection
• Over-temperature protection
• Small 16 Ld 4mmx4mm QFN
• Pb-Free (RoHS compliant)
Applications
• DC/DC POL modules
• µC/µP, FPGA and DSP power
• Plug-in DC/DC modules for routers and switchers
• Portable instruments
• Test and measurement systems
• Li-ion battery powered devices
• Small form factor (SFP) modules
• Barcode readers
November 17, 2014
FN7526.2
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 LLC 2009, 2014. 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  
ISL8013A
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating conditions and
the typical specification are measured at the following conditions unless otherwise noted: TA = -40°C to +85°C, VIN = 3.6V, EN = VDD. Typical values are
at TA = +25°C. Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7)
UNITS
N-Channel MOSFET ON-Resistance
LX Maximum Duty Cycle
VIN = 5V, IO = 200mA
VIN = 2.8V, IO = 200mA
- 50 75
- 70 100
- 100 -
mΩ
mΩ
PWM Switching Frequency
LX Minimum On-Time
fS
SYNCH = High
0.80
-
1.00
-
1.20
140
MHz
ns
PG
Output Low Voltage
Sinking 1mA
- - 0.3
V
Delay Time (Rising Edge)
0.65 1 1.35
ms
PG Pin Leakage Current
PG = VIN = 3.6V
- 0.01 0.1
µA
PGOOD Rising Threshold
Percentage of regulation voltage
89 92 95
%
PGOOD Falling Threshold
Percentage of regulation voltage
85 88 91.5
%
PGOOD Delay Time (Falling Edge)
- 15 -
µs
EN, SYNCH
Logic Input Low
- - 0.4
V
Logic Input High
1.4 -
-
V
Synch Logic Input Leakage Current
Enable Logic Input Leakage Current
Thermal Shutdown
ISYNCH
IEN
Pulled up to 5.5V
- 0.1 1
- 0.1 1
- 140 -
µA
µA
°C
Thermal Shutdown Hysteresis
- 25 -
°C
NOTES:
6. Limits established by characterization and are not production tested.
7. 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.
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FN7526.2
November 17, 2014
5 Page 
ISL8013A
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 2.5V to 5.5V, EN = VIN,
SYNCH = 0V, L = 1.5µH, C1 = 2x22µF, C2 = 2x22µF, IOUT = 0A to 3A. (Continued)
PHASE 2V/DIV
LX 2V/DIV
VOUT 0.5V/DIV
IL 2A/DIV
PG 5V/DIV
VOUT 1V/DIV
IL 2A/DIV
PG 5V/DIV
FIGURE 32. OUTPUT SHORT-CIRCUIT
FIGURE 33. OUTPUT SHORT-CIRCUIT RECOVERY
5.000
4.875
4.750
4.625
OCP_3.3VIN
4.500
4.375
4.250
OCP_5VIN
4.125
4.000
-50
-25
0 25 50
TEMPERATURE (°C)
75 100
FIGURE 34. OUTPUT CURRENT LIMIT vs TEMPERATURE
Theory of Operation
The ISL8013A is a step-down switching regulator optimized for
battery-powered handheld applications. The regulator operates at
1MHz fixed switching frequency under heavy load conditions to
allow smaller external inductors and capacitors to be used for
minimal printed-circuit board (PCB) area. At light load, the regulator
reduces the switching frequency, unless forced to the fixed
frequency, to minimize the switching loss and to maximize the
battery life. The quiescent current, when the output is not loaded, is
typically only 35µA. The supply current is typically only 0.1µA when
the regulator is shut down.
PWM Control Scheme
Pulling the SYNCH pin HI (>2.5V) forces the converter into PWM
mode, regardless of output current. The ISL8013A employs the
current-mode pulse-width modulation (PWM) control scheme for
fast transient response and pulse-by-pulse current limiting. Figure 2
shows the block diagram. The current loop consists of the oscillator,
the PWM comparator, current sensing circuit and the slope
compensation for the current loop stability. The gain for the current
sensing circuit is typically 250mV/A. The control reference for the
current loops comes from the error amplifier's (EAMP) output.
The PWM operation is initialized by the clock from the oscillator.
The P-Channel MOSFET is turned on at the beginning of a PWM
cycle and the current in the MOSFET starts to ramp up. When the
sum of the current amplifier CSA and the slope compensation
(237mV/µs) reaches the control reference of the current loop, the
PWM comparator COMP sends a signal to the PWM logic to turn
off the P-MOSFET and turn on the N-Channel MOSFET. The
N-MOSFET stays on until the end of the PWM cycle. Figure 35
shows the typical operating waveforms during the PWM operation.
The dotted lines illustrate the sum of the slope compensation
ramp and the current-sense amplifier’s CSA output.
The output voltage is regulated by controlling the VEAMP voltage
to the current loop. The bandgap circuit outputs a 0.8V reference
voltage to the voltage loop. The feedback signal comes from the
VFB pin. The soft-start block only affects the operation during the
start-up and will be discussed separately. The error amplifier is a
transconductance amplifier that converts the voltage error signal
to a current output. The voltage loop is internally compensated
with the 27pF and 390kΩ RC network. The maximum EAMP
voltage output is precisely clamped to 1.6V.
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November 17, 2014
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ISL8013A.PDF ] | |
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