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PDF ISL78236 Data sheet ( Hoja de datos )
| Número de pieza | ISL78236 | |
| Descripción | Dual 3A Current Sharing 2.5MHz High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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Dual 3A Current Sharing 2.5MHz High Efficiency
Synchronous Buck Regulator
ISL78236
The ISL78236 is a dual output 3A/3A integrated FET buck
regulator for point-of-load power applications. The supply
voltage range is from 2.8V to 6V, allowing for the use of a
single Li+ cell, three NiMH cells or a regulated 3V/5V bus
input. It is optimized for regulating output voltages down to
1.2V. Each channel provides an output current up to 3A which
can be combined to form a single 6A output in current sharing
mode. The two channels operate 180° out-of-phase to reduce
input RMS current and EMI.
The ISL78236 integrates a pair of low ON-resistance P-channel
and N-channel internal MOSFETs to maximize efficiency and
minimize external component count. It can operate up to
100% duty cycle to maximize operating life as battery voltage
drops out. When supplying 3A on each channel, the 100% duty
cycle operation limits the dropout voltage to less than 250mV.
Other features include internal digital soft-start, independent
channel enable for power sequencing, overcurrent protection,
and thermal shutdown.
The ISL78236 is offered in a 24 Ld 4mmx4mm QFN package
with 1mm maximum height. The complete converter occupies
less than 1.5cm2 area.
The ISL78236 is AEC - Q100 qualified and is rated for the
automotive temperature range (-40°C to +105°C).
Features
• Dual 3A/3A independent outputs
• 2.5MHz synchronous buck regulator with internal MOSFETs
up to 95% efficiency
• 2% voltage reference accuracy over-temperature
• 6A current sharing mode operation
• Internal or external compensation
• Peak current limiting and hiccup mode short circuit
protection
• Reverse overcurrent protection
• Over-temperature protection shutdown
• AEC - Q100 qualified
Applications
• DSP and embedded processor power supply
• Infotainment system power
• Automotive point of load power
Related Literature
• AN1927, “ISL78236DUALEVAL1Z Dual 3A Low Quiescent
Current High Efficiency Synchronous Buck Regulator”
• AN1928, “ISL78236CRSHEVAL1Z Current Sharing 6A Low
Quiescent Current High Efficiency Synchronous Buck
Regulator”
3V INPUT
EN1
PG1
EN2
PG2
ISL78236
LX1
LX2
1.2V/3A
FPGA OR DSP
POWER
1.5V/3A
ASIC POWER
FIGURE 1. TYPICAL APPLICATION BLOCK DIAGRAM: DUAL OUTPUT
3A/3A BUCK REGULATOR
100
2.5VOUT
90
80
70
1.2VOUT
1.5VOUT
1.8VOUT
60
50
40
0.0 0.5 1.0 1.5 2.0
2.5 3.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD CURRENT, VIN = 3.3V, TA = +25°C
April 28, 2014
FN8624.0
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  
Block Diagram
ISL78236
COMP
SS
EN1
SOFT-
S TSATTRA TR
SHUTDOWN
BANDGAP 0.8V
+
EAMP
27pF
390k
+
PWM
COMP
FB1
1.6k
3pF
SLOPE
COMP
+
0.5V
SCP
+
0.3pF
0.864V
+
PG1
SGND
V IN 1
0.736V
+
1M
1ms
DELAY
THERMAL
SHUTDOWN
O SCILLATOR
SHUTDOWN
EN2
SS SOFT-
SSTTATARRT
SHUTDOWN
BANDGAP 0.8V
+
EAMP
27pF
390k
0 .3 p F
+
COMP
FB2
1.6k
3pF
SLOPE
COMP
+
0.5V
SCP
+
0.864V
+
PG2
SGND
VIN2
0.736V
+
1M
1ms
DELAY
SHUTDOWN
PWM
L O G IC
CONTROLLER
P R O T E C T IO N
D R IV E R
+
CSA1
OCP
THRESHOLD
L O G IC
SHUTDOWN
PWM
L O G IC
CONTROLLER
PROTECTIO N
D R IV E R
+
CSA2
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5
VIN1
LX1
PGND
SYNC
VIN2
LX2
PGND
FN8624.0
April 28, 2014
5 Page 
ISL78236
Typical Operating Performance for Dual PWM Operation
Unless otherwise noted, operating conditions are: TA = +25°C; VOUT1 = 1.8V; VOUT2 = 1.8V; IOUT1 = 0A to 3A; IOUT2 = 0A to 3A, L1 = L2 = 0.6µH,
COUT1 = 2x22µF, COUT2 = 2x22µF, FSW = 2.5MHz. (Continued)
LX1 2V/DIV
200ns/DIV
VIN = 5V
LX2 2V/DIV
200ns/DIV
VIN = 5V
VOUT RIPPLE 20mV/DIV
IL1 2A/DIV
FIGURE 11. STEADY STATE OPERATION AT NO LOAD CHANNEL 1
VOUT RIPPLE 20mV/DIV
IL2 2A/DIV
FIGURE 12. STEADY STATE OPERATION AT NO LOAD CHANNEL 2
LX1 2V/DIV
200ns/DIV
VIN = 5V
LX2 2V/DIV
200ns/DIV
VIN = 5V
VOUT RIPPLE 20mV/DIV
IL1 2A/DIV
FIGURE 13. STEADY STATE OPERATION AT 3A LOAD CHANNEL 1
VOUT RIPPLE 20mV/DIV
IL2 2A/DIV
FIGURE 14. STEADY STATE OPERATION AT 3A LOAD CHANNEL 2
VOUT1 RIPPLE 100mV/DIV
VIN = 5V
100µs/DIV
CH2 IOUT = 0A
VOUT2 RIPPLE 100mV/DIV
VIN = 5V
100µs/DIV
CH1 IOUT = 0A
IL1 2A/DIV
FIGURE 15. LOAD TRANSIENT CHANNEL 1
IL2 2A/DIV
FIGURE 16. LOAD TRANSIENT CHANNEL 2
Submit Document Feedback 11
FN8624.0
April 28, 2014
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ISL78236.PDF ] | |
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