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PDF ISL8023 Data sheet ( Hoja de datos )
| Número de pieza | ISL8023 | |
| Descripción | (ISL8023 / ISL8024) Compact Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ISL8023 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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Compact Synchronous Buck Regulator
ISL8023, ISL8024
The ISL8023, ISL8024 are highly efficient, monolithic,
synchronous step-down DC/DC converters that can deliver 3A
(ISL8023) or 4A (ISL8024) of continuous output current from a
2.7V to 5.5V input supply. The devices use current mode control
architecture to deliver very low duty cycle operation at high
frequency with fast transient response and excellent loop stability.
The ISL8023 and ISL8024 integrate a very low On-resistance
P-Channel (45mΩ) high side FET and N-Channel (19mΩ) low
side FET to maximize efficiency and minimize external
component count. The 100% duty-cycle operation allows less
than 200mV dropout voltage at 4A output current. The
operation frequency of the pulse-width modulator (PWM) is
adjustable from 500kHz to 4MHz. The default switching
frequency of 1MHz is set by connecting the FS pin high, which
allows for the use of small external components.
The ISL8023, ISL8024 can be configured for discontinuous or
forced continuous operation at light load. Forced continuous
operation reduces noise and RF interference while
discontinuous mode provides higher efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal hiccup mode current
limiting during short circuit and overcurrent conditions. Other
protection, such as overvoltage and over-temperature are also
integrated into the device. A power-good output voltage
monitor indicates when the output is in regulation.
The ISL8023, ISL8024 offer a 1ms Power-Good (PG) timer at
power-up. When in shutdown, ISL8023, ISL8024 discharges
the output capacitor through an internal soft-stop switch. Other
features include internal fixed or adjustable soft-start and
internal/external compensation.
The ISL8023 and ISL8024 are offered in a space saving 16 Ld
3x3 Pb-free QFN package with an exposed pad for improved
thermal performance and 1mm maximum height. The
complete converter occupies less than 0.22 in2 area.
Various fixed output voltages are available upon request. See
the “Ordering Information” on page 4 for more details.
Features
• 2.7V to 5.5V input voltage range
• Very low on-resistance FET’s - P-Channel 45mΩ and
N-Channel 19mΩ typical values
• High efficiency synchronous buck regulator with up to 95%
efficiency
• 0.8% reference accuracy over-temperature/load/line
• Complete BOM with as few as 3 external parts
• Start-up with pre-biased output
• Internal soft-start - 1ms or adjustable
• Soft-stop output discharge during disabled
• Adjustable frequency from 500kHz to 4MHz - default at
1MHz (8023/24), 2MHz (8023A/24A)
• External synchronization up to 4MHz
• Over-temperature, Overcurrent, Overvoltage and negative
overcurrent protection
• Tiny 3x3 QFN package
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
Related Literature
• See AN1759, “3A/4A Low Quiescent Current High Efficiency
Synchronous Buck Regulator”
March 24, 2014
FN7812.3
100
90
3.3VOUT PFM
80
70 3.3VOUT PWM
60
50
400.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
IOUT (A)
FIGURE 1. EFFICIENCY T = +25°C, VIN = 5V
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 2011, 2012, 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  
ISL8023, ISL8024
SS SSOoFfTt
SHUTDOWN START
COMP
55pF
100kΩ
EN BANDGAP VREF
EAMP
-
VFB
6k
3pF
+
0.6V -
+
SLSOloPpEe
COMP
OV
-
0.85*VREF +
UV
PG
SGND
1ms
DELAY
FS SYNC
SHUTDOWN
VDD
OSCILLATOR
+
COMP
-
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
HS DRIVER
+
OCP
-
+
SKIP-
+
CSA
-
ISET
THRESHOLD
NEG CURRENT
SENSING
VIN
P
PHASE
LS
DRIVER
N
PGND
0.5V
-
SCP
+
ZERO-CROSS
SENSING
SHUTDOWN
100Ω
FIGURE 3. FUNCTIONAL BLOCK DIAGRAM
Submit Document Feedback
5
FN7812.3
March 24, 2014
5 Page 
ISL8023, ISL8024
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VVIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 4A. (Continued)
EN 2V/DIV
VOUT 1V/DIV
EN 2V/DIV
VOUT 1V/DIV
IL 1A/DIV
PG 2V/DIV
FIGURE 22. SOFT-START AT NO LOAD (PFM)
IL 1A/DIV
PG 5V/DIV
FIGURE 23. SOFT-START WITH PRE-BIASED 1V
EN 2V/DIV
VOUT 1V/DIV
IL 2A/DIV
PG 5V/DIV
FIGURE 24. SOFT-START AT FULL LOAD
EN 2V/DIV
VOUT 1V/DIV
IL 1A/DIV
PG 5V/DIV
FIGURE 25. SOFT-DISCHARGE SHUTDOWN
PHASE 5V/DIV
VOUT RIPPLE 20mV/DIV
IL 0.5A/DIV
SYNC 5V/DIV
FIGURE 26. STEADY STATE OPERATION AT NO LOAD WITH
FREQUENCY = 2MHz
PHASE 5V/DIV
VOUT RIPPLE 20mV/DIV
IL 2A/DIV
SYNC 5V/DIV
FIGURE 27. STEADY STATE OPERATION AT FULL LOAD WITH
FREQUENCY = 2MHz
Submit Document Feedback 11
FN7812.3
March 24, 2014
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet ISL8023.PDF ] | |
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