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PDF ISL8026A Data sheet ( Hoja de datos )
| Número de pieza | ISL8026A | |
| Descripción | Compact Synchronous Buck Regulators | |
| Fabricantes | Intersil | |
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DATASHEET
Compact Synchronous Buck Regulators
ISL8026, ISL8026A
The ISL8026, ISL8026A are highly efficient, monolithic,
synchronous step-down DC/DC converters that can deliver 6A of
continuous output current from a 2.5V to 5.5V input supply. The
devices use current mode control architecture to deliver a very low
duty cycle operation at high frequency with fast transient
response and excellent loop stability.
The ISL8026, ISL8026A integrate a very low ON-resistance
P-Channel (36mΩ) high-side FET and N-Channel (13mΩ)
low-side FET to maximize efficiency and minimize external
component count. The 100% duty-cycle operation allows less
than 180mV dropout voltage at 6A output current. The
operation frequency of the Pulse-width Modulator (PWM) is
adjustable from 500kHz to 4MHz. The default switching
frequency, which is set by connecting the FS pin high, is 1MHz
for the ISL8026 and 2MHz for the ISL8026A.
The ISL8026, ISL8026A 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 ISL8026, ISL8026A offer a 1ms Power-good (PG) timer at
power-up. When in shutdown, the ISL8026, ISL8026A
discharge the output capacitor through an internal soft-stop
switch. Other features include internal fixed or adjustable
soft-start and internal/external compensation.
The ISL8026, ISL8026A are offered in a space saving 16 Ld
3x3 Pb-free TQFN package with an exposed pad for improved
thermal performance and 0.8mm maximum height. The
complete converter occupies less than 0.22 in2 area.
Features
• 2.5V to 5.5V input voltage range
• Very low ON-resistance FET’s - P-channel 36mΩ and
N-channel 13mΩ typical values
• High efficiency synchronous buck regulator with up to 95%
efficiency
• 1% reference accuracy over load/line/temperature (-40°C
to +85°C)
• Internal soft-start: 1ms or adjustable
• Soft-stop output discharge during disable
• Adjustable frequency from 500kHz to 4MHz - default at
1MHz (ISL8026) or 2MHz (ISL8026A)
• External synchronization up to 4MHz
• Over-temperature, overcurrent, overvoltage and negative
overcurrent protection
Applications
• DC/DC POL modules
• μC/µP, FPGA and DSP power
• Video processor/SOC power
• Li-ion battery powered devices
• Routers and switchers
• Portable instruments
• Test and measurement systems
• Industrial PCs
Related Literature
• UG033, “ISL8026xEVAL3Z Evaluation Board User Guide”
VIN
GND
+2.5V …+5.5V
C1
2 x 22μF
R1
100k:
PG
1 VIN
2 VIN
3 PG
4
SYNC
ISL8026
L1
1.0μH C2
2 x 22μF
+1.8V/6A
PGND
PGND
PGND/
SGND
FB
R2 C3*
200k: 22pF
R3
100k:
VOUT
GND
100
90
80
70
60
3.3VOUT PFM
3.3VOUT PWM
*C3 IS OPTIONAL. IT IS
RECOMMENDED TO PUT A
PLACEHOLDER FOR IT AND CHECK
LOOP ANALYSIS BEFORE USE.
R2
=
R3
V--V---F--O--B---
– 1
(EQ. 1)
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION
(INTERNAL COMPENSATION OPTION)
50
40
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD 1MHz 5VIN
June 26, 2015
FN8736.1
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 LLC 2015. 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  
Block Diagram
ISL8026, ISL8026A
SS SOSFoTft-
START
SHUTDOWN
COMP
55pF
100kΩ
FS SYNC
SHUTDOWN
EN BANDGAP VREF
EAMP
-
FB
6kΩ
3pF
+
0.8V
-
+
SLSOloPpEe
COMP
OV
-
0.85*VREF
+
UV
PG
SGND
1ms
DELAY
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
FN8736.1
June 26, 2015
5 Page 
ISL8026, ISL8026A
Typical Operating Performance Unless otherwise noted, operating conditions are: TA = +25°C, VIN = 5V, EN = VIN,
SYNC = VIN, L = 1.0µH, C1 = 22µF, C2 = 2 x 22µF, IOUT = 0A to 6A. Resistor load is used in the test. (Continued)
PHASE 5V/DIV
PHASE 5V/DIV
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 19. START-UP AT NO LOAD (PFM)
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
1ms/DIV
FIGURE 20. START-UP AT NO LOAD (PWM)
PHASE 5V/DIV
PHASE 5V/DIV
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 21. SHUTDOWN AT NO LOAD (PFM)
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 22. SHUTDOWN AT NO LOAD (PWM)
PHASE 5V/DIV
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 23. START-UP AT 6A LOAD (PWM)
Submit Document Feedback 11
PHASE 5V/DIV
VOUT 1V/DIV
VEN 5V/DIV
PG 5V/DIV
500µs/DIV
FIGURE 24. SHUTDOWN AT 6A LOAD (PWM)
FN8736.1
June 26, 2015
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL8026A.PDF ] | |
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