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ISL78235 PDF Datasheet ( 特性, スペック, ピン接続図 )

部品番号 ISL78235
部品説明 5A Automotive Synchronous Buck Regulator
メーカ Intersil Corporation
ロゴ Intersil Corporation ロゴ 



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ISL78235 Datasheet, ISL78235 PDF,ピン配置, 機能
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.

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