ISL78235 Datasheet PDF - Intersil Corporation
| Part Number | ISL78235 | |
| Description | 5A Automotive Synchronous Buck Regulator | |
| Manufacturers | Intersil Corporation | |
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DATASHEET
5A Automotive Synchronous Buck Regulator
ISL78235
The ISL78235 is a highly efficient, monolithic, synchronous
step-down DC/DC converter that can deliver 5A of continuous
output current from a 2.7V to 5.5V input supply. The device uses
peak current mode control architecture to achieve very low duty
cycle operation at high frequency with fast transient response and
excellent loop stability.
The ISL78235 integrates a low ON-resistance P-Channel
(35mΩ, typ) high-side FET and N-Channel (11mΩ, typ) low-side
FET to maximize efficiency and minimize external component
count. The 100% duty cycle operation allows less than 250mV
dropout voltage at 5A output current. The operating frequency
of the Pulse Width Modulator (PWM) is adjustable from
500kHz to 4MHz. The default switching frequency of 2MHz is
set by connecting the FS pin high.
The ISL78235 can be configured for discontinuous (PFM) or
forced continuous (PWM) operation at light load. Forced
continuous operation reduces noise and RF interference, while
discontinuous mode provides higher efficiency by reducing
switching losses at light loads.
Fault protection is provided by internal hiccup mode current
limiting during short circuit and overcurrent conditions. The
device also integrates output over voltage and
over-temperature protections. A power-good monitor indicates
when the output is in regulation. The ISL78235 offers a 1ms
Power-Good (PG) timer at power-up.
When in shutdown, the ISL78235 discharges the output
capacitor through an internal 100Ω soft-stop switch. Other
features include internal fixed or adjustable soft-start and
internal/external compensation.
The ISL78235 is available in a 3mmx3mm 16 Ld Thin Quad Flat
No-Lead (TQFN) Pb-free package with an exposed pad for
improved thermal performance. The ISL78235 is rated to
operate across the temperature range of -40°C to +105°C.
Features
• 2.7 to 5.5V input voltage range
• 2MHz default switching frequency
• 100ns guaranteed phase min on time for wide output
regulation
• Adjustable switching frequency from 500kHz to 4MHz
• External synchronization from 1MHz to 4MHz
• Optional PFM mode for light-load efficiency improvement
• Very low ON-resistance HS/LS switches: 35mΩ/11mΩ
• Internal 1ms or adjustable external soft-start
• Soft-stop output discharge during disable
• OTP, OCP, Output OVP, Input UVLO Protections
• 1% reference accuracy over-temperature
• Up to 95% efficiency
• AEC-Q100 qualified
• Common pinout family allows migration from 3A to 5A
without PCB change:
- ISL78233 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3A
- ISL78234 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4A
- ISL78235 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5A
Applications
• DC/DC POL modules
• μC/µP, FPGA and DSP power
• Video processor/SOC power
• Li-ion battery powered devices
• Automotive infotainment power
Related Literature
• UG015, “ISL7823xEVAL1Z Evaluation Board User Guide”
• ISL78233, ISL78234 Datasheet
L
2.7V TO 5.5V
COUT
CIN
16 15 14 13
VIN 1
VDD 2
PG 3
*ISL78235
PGND
12
PGND
11
SGND
10
SYNC 4
FB
9
56 78
VOUT 5A LOAD
DSP, FPGA
*Pin Compatible
ISL78233 - 3A BUCK
ISL78234 - 4A BUCK
100
90
2.5VOUT
80 3.3VOUT
1.8VOUT 1.5VOUT
1.2VOUT
70
60
50
TA = +25°C
40
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
OUTPUT LOAD (A)
FIGURE 1. TYPICAL APPLICATION: 5A BUCK REGULATOR
FIGURE 2. EFFICIENCY vs LOAD (VIN = 5V; fsw = 2MHz; SYNC = GND)
February 20, 2015
FN8713.1
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 2015. 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.
|
| |
 
ISL78235
Absolute Maximum Ratings (Reference to GND)
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 5.8V (DC) or 7V (20ms)
EN, FS, PG, SYNC, VFB . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to VIN + 0.3V
PHASE . . . . . . . . . . . . -1.5V (100ns)/-0.3V (DC) to 6.5V (DC) or 7V (20ms)
COMP, SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Rating
Human Body Model (Tested per AEC-Q100-002) . . . . . . . . . . . . . . . . 5kV
Machine Model (Tested per AEC-Q100-003) . . . . . . . . . . . . . . . . . . 300V
Charge Device Model (Tested per AEC-Q100-011) . . . . . . . . . . . . . . . 2kV
Latch-up (Tested per AEC-Q100-004, Class II, Level A) . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance
JA (°C/W) JC (°C/W)
16 LD TQFN Package (Notes 5, 6) . . . . . . .
43
3.5
Operating Junction Temperature Range . . . . . . . . . . . . . .-55°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V
Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 5A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +105°C
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
6. JC, “case temperature” location is at the center of the exposed metal pad on the package underside.
Electrical Specifications Specification limits are established at the following conditions: TA = -40°C to +105°C, VIN = 3.6V, EN = VIN,
unless otherwise noted. Typical values are at TA = +25°C. Boldface limits apply across the operating temperature range - 40°C to +105°C.
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 7) TYP (Note 7) UNITS
INPUT SUPPLY
VIN Undervoltage Lockout Threshold
VUVLO
Rising, no load
Falling, no load
2.5 2.7
2.2 2.45
V
V
Quiescent Supply Current
IVIN SYNC = GND, no load at the output
SYNC = GND, no load at the output and no
switches switching
47 µA
47 60 µA
Shutdown Supply Current
OUTPUT REGULATION
SYNC = VIN, fSW = 2MHz, no load at the output
ISD SYNC = GND, VIN = 5.5V, EN = low
19 25 mA
4 10 µA
Reference Voltage
VFB Bias Current
Line Regulation
Soft-start Ramp Time Cycle
VREF
IVFB
VFB = 0.75V
VIN = VO + 0.5V to 5.5V (minimal 2.7V)
SS = SGND
0.594 0.6 0.606
V
0.1 µA
0.2 %/V
1 ms
Soft-start Charging Current
OVERCURRENT PROTECTION
ISS VSS = 0.1V
1.7 2.1 2.5
µA
Current Limit Blanking Time
tOCON
17 Clock
pulses
Overcurrent and Auto Restart Period
Positive Peak Current Limit
Peak Skip Limit
Zero Cross Threshold
tOCOFF
IPLIMIT
ISKIP
TA = +25°C
TA = -40°C to +105°C
TA = +25°C
TA = -40°C to +105°C
8 SS cycle
6.2 7.8 9.4
A
6.1 11 A
0.85
1.1
1.4
A
0.83
1.6 A
-275
375 mA
Negative Current Limit
INLIMIT
TA = +25°C
TA = -40°C to +105°C
-5.1 -2.8 -1.3
-6.0 -0.6
A
A
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5
FN8713.1
February 20, 2015
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