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PDF ISL80019 Data sheet ( Hoja de datos )
| Número de pieza | ISL80019 | |
| Descripción | Compact Synchronous Buck Regulators | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Compact Synchronous Buck Regulators
ISL8002, ISL8002A, ISL80019, ISL80019A
ISL8002, ISL8002A, ISL80019 and ISL80019A are highly
efficient, monolithic, synchronous step-down DC/DC converters
that can deliver up to 2A of continuous output current from a 2.7V
to 5.5V input supply. They use peak current mode control
architecture to allow very low duty cycle operation. They operate
at either 1MHz or 2MHz switching frequency, thereby providing
superior transient response and allowing for the use of small
inductors. They also have excellent stability and provide both
internal and external compensation options.
ISL8002, ISL8002A, ISL80019 and ISL80019A integrate 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. They can operate at 100% duty cycle (at 1MHz) with a
dropout of 200mV at 2A output current.
These devices 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 reduces noise susceptibility and RF
interference.
These devices are offered in a space saving 8 pin 2mmx2mm
TDFN lead free package with exposed pad for improved thermal
performance. The complete converter occupies less than
0.10in2 area.
Features
• VIN range 2.7V to 5.5V
• VOUT range is 0.6V to VIN
• IOUT maximum is 1.5A or 2A (see Table 1 on page 3)
• Switching frequency is 1MHz or 2MHz (see Table 1 on
page 3)
• Internal or external compensation option
• 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 point of load DC/DC
• Set-top boxes and cable modems
• FPGA power
• DVD, HDD drives, LCD panels, TV
Related Literature
• See AN1803, “1.5A/2A Low Quiescent Current High
Efficiency Synchronous Buck Regulator”
VIN
GND
+2.7V …+5.5V 1 VIN
C1
22μF
2 EN
EN 3 MODE
PG 4 PG
ISL8002
PAD
9
L1
PHASE 8 1.2μH
C5
22μF
PGND 7
+1.8V/2A
C6
22μF
R1
FB 6 +0.6V 200kΩ 1%
COMP 5
R2
100kΩ 1%
VOUT
GND
R1
=
R2
⎛
⎝
---V----O----
VFB
–
1⎠⎞
FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION
(INTERNAL COMPENSATION OPTION)
(EQ. 1)
100
90
80
70
2.5VOUT
60
1.8VOUT
1.5VOUT
50
1.2VOUT
0.9VOUT
0.8VOUT
400.0 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 = 1MHz, VIN = 3.3V, MODE = PFM, TA = +25°C
July 30, 2013
FN7888.2
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 2013. 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  
ISL8002, ISL8002A, ISL80019, ISL80019A
Functional Block Diagram
SOSoFfTt-
START
COMP
27pF
*
200kΩ
MODE
SHUTDOWN
EN VREF
BANDGAP
EAMP
SHUTDOWN
-
3pF
+
FB
6kΩ
1.15*VREF
-
SSLlOoPpEe
COMP
+ OV
0.85*VREF
VIN
-
+
UV
5MΩ
PG
1ms
DELAY
+
COMP
-
OSCILLATOR
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
HS DRIVER
+
OCP
-
+
SKIP
-
+
CSA
-
NEG CURRENT
SENSING
0.3V
-
SCP
+
ZERO-CROSS
SENSING
SHUTDOWN
100Ω
VIN
P
PHASE
N
PGND
* By default, when COMP is tied to VIN, the voltage loop is internally compensated with the 27pF and 200kΩ RC network.
Please see "COMP" pin in the “Pin Descriptions” table on page 4 for more details.
FIGURE 3. FUNCTIONAL BLOCK DIAGRAM
5 FN7888.2
July 30, 2013
5 Page 
ISL8002, ISL8002A, ISL80019, ISL80019A
Typical Performance Curves (Continued)
0.925
0.920
0.915
5VIN PFM
5VIN PWM
3.3VIN PWM
3.3VIN PFM
1.230
1.225
1.220
5VIN PFM
5VIN PWM
3.3VIN PWM
3.3VIN PFM
0.910
1.215
0.905
1.210
0.900
1.205
0.895
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 15. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 0.9V, TA = +25°C
1.200
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 16. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 1.2V, TA = +25°C
1.520
1.515
1.510
5VIN PFM
5VIN PWM
3.3VIN PWM
3.3VIN PFM
1.505
1.500
1.495
1.490
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 17. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 1.5V, TA = +25°C
1.810
1.805
1.800
5VIN PFM
5VIN PWM
3.3VIN PWM
3.3VIN PFM
1.795
1.790
1.785
1.780
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
OUTPUT LOAD (A)
FIGURE 18. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 1.8V, TA = +25°C
1.6
1.8 2.0
2.505
2.500
2.495
5VIN PFM
5VIN PWM
3.3VIN PWM
3.3VIN PFM
2.490
2.485
2.480
2.4750.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
OUTPUT LOAD (A)
FIGURE 19. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 2.5V, TA = +25°C
3.335
3.330
5VIN PFM MODE
5VIN PWM MODE
3.325
3.320
3.315
3.310
3.305
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 20. VOUT REGULATION vs LOAD,
FSW = 2MHz, VOUT = 3.3V, TA = +25°C
11 FN7888.2
July 30, 2013
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL80019.PDF ] | |
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