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PDF ISL95901 Data sheet ( Hoja de datos )
| Número de pieza | ISL95901 | |
| Descripción | Dual Integrated Buck Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
Wide VIN Dual Integrated Buck Regulator With 4A/4A
Continuous Output Current and LDOs
ISL95901
The ISL95901 is a dual, high-efficient buck regulator capable
of 4A per channel continuous output current. It integrates two
LDOs and one low-impedance switch. This power management
IC delivers power in portable and embedded systems. With an
input range of 4.5V to 16V, it provides a high frequency power
solution for a variety of point-of-load applications. Outputs are
adjustable to meet system needs.
A PWM controller drives two pairs of internal switching
N-channel power MOSFETs to generate output voltage. The
integrated power switch is optimized for excellent thermal
performance for up to 4A of output current per channel.
The ISL95901 modulator features Intersil R4™ Technology,
which combines the best features of fixed-frequency and
hysteretic PWMs while eliminating many of their drawbacks.
Like R3™ Technology, the R4™ Technology allows variable
frequency in response to load transients and maintains the
benefits of current-mode hysteretic controllers. In addition, it
reduces regulator output impedance and uses accurate
referencing to eliminate the need for a high-gain voltage
amplifier. The resulting topology can be tuned to voltage-mode
hysteretic transient speed while maintaining a linear control
model. This topology removes the need for compensation,
which greatly simplifies regulator design for customers and
reduces external component count and cost.
Protection features include overcorrect, negative overcorrect,
UVLO and thermal overload. The ISL95901 is available in a
46 Ld 5mmx6mm Quad Flat (QFN) Pb-free package.
Features
• Wide input voltage range from 4.5V to 16V
• Adjustable output voltages with continuous output current
up to 4A
• 1% accuracy over temperature and VCC range
• Built-in low-power LDO for external µC
• Built-in compensation
• Internally set SS and OCP
• Independent enable, power-good and standby control inputs
for each output
• Innovative R4™ Modulator
• Boot undervoltage detection
Applications
• General purpose, point-of-load DC/DC power conversion
• Notebook, netbook and tablet
• Embedded computing system
Related Literature
• See AN1743 “Wide VIN Dual Integrated Buck Regulator With
4A/4A Continuous Output Current and LDOs”
00
90
80
6VIN PFM
12VIN PFM
8.4VIN PFM
70 6VIN PWM
8.4VIN PWM
60 12VIN PWM
50
40
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0
OUTPUT LOAD (A)
FIGURE 1. EFFICIENCY vs LOAD, VIN = 12V, TA = +25°C
IOUT
R4
VCOMP
fSW = 300kHz, VOUT = 5V
VOUT
R3
t
FIGURE 2. R3™ vs R4™ IDEALIZED TRANSIENT RESPONSE
January 22, 2015
FN7893.1
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 2013, 2015. All Rights Reserved
Intersil (and design) and R3 and R4 technologies are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL95901
Typical Application Schematic
VIN: 4.5V TO 16V
2
1µF
LDO3P3
3.3V
C7
4.7 µF
C1
10µF
LDO3P3
VIN1
C5
1µF
LDO5
VIN2
VIN
OUT1
3.3V/4A
L1: 1µH
C4
0.1µF
C3
2x47µF
(KELVIN SENSE)
C9 100pF
R1 31.6kΩ
R2
10kΩ
BOOT1
PHASE1
(PAD2)
BOOT2
PHASE2
(PAD3)
PGND1
GND1
PGND2
GND2
FB1
GND
ISL95901
FB2
VSIN1
FS
FS
VSIN2
VSOUT2
VIN
VIN
VCC
EN1
EN2
PG1
PG2
STB2
PAD1
MODE
C2
10 µF
LDO5
5V
C6
4.7µF
C6
0.1µF
OUT2
L2: 1.5µH 5V/4A
C4
2x47µF
(KELVIN SENSE)
C10 100pF
R3 52.3kΩ
R4
10kΩ
VSOUT2
5V
C8
4.7µF
FIGURE 3. DUAL 4A OUTPUT AT 1MHz (VIN RANGE FROM 4.5V TO 16V)
Submit Document Feedback
5
FN7893.1
January 22, 2015
5 Page 
ISL95901
Typical Performance Curves Circuit of Figure 3. VIN = 12V, VOUT1 = 3.3V, VOUT2 = 5, IOUT1 = 4A, IOUT2 = 4A, TA = -40°C to +85°C,
unless otherwise noted. Typical values are at TA = +25°C. (Continued)
PHASE1 10V/DIV
VOUT1 2V/DIV
VEN1 10V/DIV
PG1 5V/DIV
5ms/DIV
FIGURE 16. CH1 SHUTDOWN AT NO LOAD (PFM)
PHASE2 10V/DIV
VOUT2 2V/DIV
VEN2 10V/DIV
PG2 5V/DIV
5ms/DIV
FIGURE 17. CH2 SHUTDOWN AT NO LOAD (PFM)
PHASE1 10V/DIV
VOUT1 2V/DIV
VEN1 10V/DIV
PG1 5V/DIV
5ms/DIV
FIGURE 18. CH1 SHUTDOWN AT NO LOAD (PWM)
PHASE1 10V/DIV
VOUT1 2V/DIV
VEN1 10V/DIV
PG1 5V/DIV
1ms/DIV
FIGURE 20. CH1 START-UP AT 4A LOAD (PWM)
Submit Document Feedback 11
PHASE2 10V/DIV
VOUT2 2V/DIV
VEN2 10V/DIV
PG2 5V/DIV
5ms/DIV
FIGURE 19. CH2 SHUTDOWN AT NO LOAD (PWM)
PHASE2 10V/DIV
VOUT2 2V/DIV
VEN2 10V/DIV
PG2 5V/DIV
1ms/DIV
FIGURE 21. CH2 START-UP AT 4A LOAD (PWM)
FN7893.1
January 22, 2015
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL95901.PDF ] | |
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