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PDF ISL8002B Data sheet ( Hoja de datos )
| Número de pieza | ISL8002B | |
| Descripción | Compact Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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DATASHEET
Compact Synchronous Buck Regulator
ISL8002B
The ISL8002B is a highly efficient, monolithic, synchronous
step-down DC/DC converter that can deliver up to 2A of
continuous output current from a 2.7V to 5.5V input supply. It
uses peak current mode control architecture to allow very low
duty cycle operation. ISL8002B operates at a 2MHz switching
frequency, thereby providing superior transient response and
allowing for the use of a small inductor. ISL8002B also has
excellent stability.
The ISL8002B integrates very low rDS(ON) MOSFETs in order to
maximize efficiency. In addition, since the high-side MOSFET is a
PMOS, the need for a boot capacitor is eliminated, thereby
reducing external component count.
The device can be configured for either PFM (discontinuous
conduction) or PWM (continuous conduction) operation at light
load. PFM provides high efficiency by reducing switching
losses at light loads and PWM for fast transient response,
which helps reduce the output noise and RF interference.
The device is offered in a space saving 8 Ld 2mmx2mm TDFN
Pb-free package with exposed pad for improved thermal
performance. The complete converter occupies less than
64mm2 area.
Features
• VIN range 2.7V to 5.5V
• IOUT maximum is 2A
• External soft-start programmable
• Output tracking and sequencing
• Switching frequency is 2MHz
• Selectable PFM or PWM operation option
• Overcurrent and short-circuit protection
• Over-temperature/thermal protection
• VIN undervoltage lockout and VOUT overvoltage protection
• Up to 95% peak efficiency
Applications
• General purpose POL
• Industrial, instrumentation and medical equipment
• FPGAs
• Telecom and networking equipment
• Game console
Related Literature
• For a full list of related documents, visit our website
- ISL8002B product page
VIN
GND
+2.7 V … +5.5 V
C1
1
VIN
22µF
2 EN
EN 3 MODE
PG 4 PG
ISL8002B
PAD
9
L1
PHASE 8
C2
3x10µF
PGND 7
+ 1. 8V / 2A
C3
4.7pF
FB 6
0.6V
SS/T R 5
R1
200k 1%
R2
100k 1%
R3
200k 1%
R4
100k 1%
VOUT
GND
TRACK
R1
=
R2
V---V--F--O--B--
–
1
(EQ. 1)
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION (INTERNAL
COMPENSATION OPTION)
100
2.5VOUT
90
80
1.8VOUT
70
1.5VOUT
1.2VOUT
60
50
0.9VOUT
0.8VOUT
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD (fSW = 2MHz, VIN = 3.3V),
MODE = PFM, TA = +25°C
October 28, 2016
FN8690.3
1
CAUTION: The device are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2014-2016. 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  
Functional Block Diagram
ISL8002B
SS/TR
MODE
INTERNAL
SS
HIGH
DETECT
0.6V
CLAMP
EN VREF
BANDGAP
EAMP
SHUTDOWN
-
3pF
+
27pF
200kΩ
+
COMP
-
OSCILLATOR
FB
6kΩ
SLSOloPpEe
COMP
SHUTDOWN
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
HS DRIVER
+
CSA
0.85*VREF
UV
VIN
5MΩ
PG
0.1ms
DELAY
0.3V
SCP
OCP
SKIP
NEG CURRENT
SENSING
ZERO-CROSS
SENSING
SHUTDOWN
100Ω
VIN
P
PHASE
N
PGND
FIGURE 3. FUNCTIONAL BLOCK DIAGRAM
Submit Document Feedback
5
FN8690.3
October 28, 2016
5 Page 
ISL8002B
Typical Performance Curves (Continued)
VEN 5V/DIV
PG1 EN2 5V/DIV
VOUT 1V/DIV
VOUT2 1V/DIV
VEN 5V/DIV
PG1 EN2 5V/DIV
500µs/DIV
FIGURE 24. SEQUENTIAL START-UP USING EN AND PG AT FULL
LOAD, VIN = 5V, MODE = PWM, TA = +25°C
VOUT 1V/DIV
VOUT2 1V/DIV
100µs/DIV
FIGURE 25. SEQUENTIAL SHUTDOWN USING EN AND PG AT FULL
LOAD, VIN = 5V, MODE = PWM, TA = +25°C
VEN1 5V/DIV
SS1 2V/DIV
VOUT1 1V/DIV
VOUT2 1V/DIV
1ms/DIV
FIGURE 26. RATIOMETRIC START-UP WITH VOUT1 LEADING VOUT2 AT
NO LOAD, VIN = 5V, MODE = PWM, TA = +25°C
VEN1 5V/DIV
SS1 2V/DIV
VOUT1 1V/DIV
VOUT2 1V/DIV
1ms/DIV
FIGURE 27. RATIOMETRIC SHUTDOWN WITH VOUT1 LEADING VOUT2
AT NO LOAD, VIN = 5V, MODE = PWM, TA = +25°C
VEN1 5V/DIV
SS1 2V/DIV
VOUT1 1V/DIV
VOUT2 1V/DIV
1ms/DIV
FIGURE 28. RATIOMETRIC START-UP WITH VOUT1 LEADING VOUT2 AT
FULL LOAD, VIN = 5V, MODE = PWM, TA = +25°C
Submit Document Feedback 11
VEN1 5V/DIV
SS1 2V/DIV
VOUT1 1V/DIV
VOUT2 1V/DIV
1ms/DIV
FIGURE 29. RATIOMETRIC SHUTDOWN WITH VOUT1 LEADING VOUT2
AT FULL LOAD, VIN = 5V, MODE = PWM, TA = +25°C
FN8690.3
October 28, 2016
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet ISL8002B.PDF ] | |
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