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PDF ISL78268 Data sheet ( Hoja de datos )
| Número de pieza | ISL78268 | |
| Descripción | 55V Synchronous Buck Controller | |
| Fabricantes | Intersil | |
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DATASHEET
55V Synchronous Buck Controller with Integrated 3A
Driver
ISL78268
The ISL78268 is a grade 1, automotive, synchronous buck
controller with integrated high/low side MOSFET drivers. It
supports a wide operating input voltage range of 5V to 55V
and up to 60V at VIN when not switching. The integrated driver
offers adaptive dead-time control and is capable of supplying
up to 2A sourcing and 3A sinking current, allowing the
ISL78268 to support power stages designed for a wide range
of loads, from under 1A to over 25A.
ISL78268’s fully synchronous architecture enables power
conversion with very high efficiency and improved thermal
performance over standard buck converters. The ISL78268 also
offers diode emulation mode for improved light load efficiency.
While ISL78268 is a peak current mode PWM controller, it
also includes a dedicated average output current modulation
loop, which achieves constant output current limiting for
applications such as battery charging, super-cap charging, and
temperature control systems where a constant current must
be provided.
The ISL78268 supports switching frequencies from 50kHz to
1.1MHz allowing the user the flexibility to trade-off switching
frequency and efficiency against the size of external
components.
The ISL78268 offers comprehensive protection features. It
includes robust current protection with cycle-by-cycle peak
current limiting, average current limiting, and a selectable
hiccup or latch-off fault responses. In addition, it offers
protection against over-temperature, as well as input and
output overvoltages.
Features
• Wide input range 5V to 55V (switching); withstand 60V
(non-switching)
• Integrated 2A sourcing, 3A sinking MOSFET drivers
• Constant current regulation/limiting - dedicated average
current control loop
• Adjustable switching frequency or external synchronization
from 50kHz up to 1.1MHz
• Low shutdown current, IQ <1µA
• Peak current mode control with adjustable slope
compensation
• Selectable diode emulation mode for high efficiency at light
load
• Input and output OVP, cycle-by-cycle current limiting,
average current OCP, OTP
• Selectable hiccup or latch-off fault responses
• Pb-free 24 Ld 4x4 QFN package (RoHS compliant)
• AEC-Q100 qualified
Applications
• Automotive power
• Telecom and industrial power supplies
• General purpose power
• Supercap charging
Related Literature
• AN1946, “ISL78268EVAL1Z Evaluation Board User Guide”
VIN
EN_IC
PVCC
EN
VCC
VIN
ISEN1P
ISEN1N
IMON/DE
PVCC
BOOT
FSYNC
PLL_COMP
ISL78268
UG
PH
LG
SLOPE
COMP
SS
ISEN2P
ISEN2N
FB
HIC/LATCH
SGND PGND
CLKOUT
PGOOD
PVCC
VOUT
VCC
POWER GOOD
FIGURE 1. SIMPLIFIED TYPICAL APPLICATION SCHEMATIC
100
95
90
85
VIN = 24V
VIN = 15V
80
VIN = 36V
75
70 VIN = 55V
65
60
55
VOUT = 12V, TA = +25°C
50
012345
IOUT (A)
FIGURE 2. EFFICIENCY CURVES (ISL78268EVAL1Z/DE MODE)
December 12, 2014
FN8657.3
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 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  
ISL78268
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL78268ARZ
782 68ARZ
-40 to +125
24 Ld 4x4 QFN
L24.4x4H
ISL78268EVAL1Z
Evaluation Board
NOTES:
1. Add “-T*” suffix for tape and reel. Please refer to TB347 for details on reel specifications.
2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
3. For Moisture Sensitivity Level (MSL), please see device information page for ISL78268. For more information on MSL please see techbrief TB363.
Submit Document Feedback
5
FN8657.3
December 12, 2014
5 Page 
ISL78268
Electrical Specifications Refer to the Block Diagram (page 6) and Typical Application Schematics (page 7). Operating conditions unless
otherwise noted: VIN = 12V, VPVCC = 5.2V and VVCC = 5.2V, EN = 5.0V, TA = -40°C to +125°C. Typicals are at TA = +25°C.
Boldface limits apply across the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
POWER-ON RESET (for both PVCC and VCC)
Rising VPVCC/VCC POR Threshold
Falling VPVCC/VCC POR Threshold
VPVCC/VCC POR Hysteresis
Phase Lock Loop Locking Time
EN
VPORH_RISE
VPORL_FALL
VPORL_HYS
tPLL_DLY
From POR to Initiation of soft-start.
RPLLCMP = 3.24k, CPLLCMP1 = 6.8nF,
CPLLCMP2 = 1nF, RFSYNC = 40.2k, fSW = 300kHz
4.35
4.1
4.55
4.15
0.4
0.8
4.75
4.3
V
V
V
ms
Enable Threshold
Input Resistance
VENH
VENL
VEN_HYS
Rising
Falling
Hysteresis
EN = 4V
EN = 6V
1.1
1.04
3000
1.2
1.14
60
5000
5
1.3
1.24
8000
V
V
mV
kΩ
kΩ
OSCILLATOR
PWM Switching Frequency
Switching Frequency Range
Synchronization Range at FSYNC
CLKOUT
FOSC
RFSYNC = 249kΩ (0.1%)
RFSYNC = 40.2kΩ (0.1%)
RFSYNC = 10kΩ (0.1%)
TA = +25°C, VIN = 12V
TA = +25°C, VIN = 12V
47.5
285
1036
50
50
50
300
1100
52.5
315
1155
1100
1100
kHz
kHz
kHz
kHz
kHz
High Level CLKOUT Output Voltage
Low Level CLKOUT Output Voltage
Output Pulse Width
Phase Shift from UG Rising Edge to CLKOUT
Pulse Rising Edge
CLKOUTH
CLKOUTL
ICLKOUT = 500µA
ICLKOUT = -500µA
CCLKOUT = 100pF
UG = OPEN, CCLKOUT = OPEN
VCC-0.4 VCC-0.1
0.1
270
180
0.4
V
V
ns
°
SYNCHRONIZATION (FSYNC pin)
Input High Threshold
VIH
3.5 V
Input Low Threshold
VIL
1.5 V
Input Pulse Width - Rise_To_Fall
20 20,000 ns
Input Pulse Width - Fall_To_Rise
20 20,000 ns
Delay from Input Pulse Rising to UG Rising Edge
UG = OPEN
325 ns
SOFT-START
Soft-Start Current
Soft-Start Pin PreBias Voltage Range
Soft-Start PreBias Voltage Accuracy
Soft-Start Clamp Voltage
REFERENCE VOLTAGE
Reference Accuracy
FB Pin Input Bias Current
ERROR AMPLIFIER
Transconductance Gain
COMP Output Impedance
Unity Gain Bandwidth
ISS
VSS_PRE
VSSCLAMP
VSS = 0V
In prebias output condition; VSS_PRE = VFB
VFB = 500mV
Measured at FB pin
VFB = 1.6V
CCMP = 100pF from COMP pin to GND
4.5 5 5.5 µA
0 1.6 V
-25 25 mV
3 3.4 3.8 V
1.584 1.6 1.616 V
-0.05
0.05 µA
2 ms
10 MΩ
11 MHz
Submit Document Feedback 11
FN8657.3
December 12, 2014
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ISL78268.PDF ] | |
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