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ISL78322 の電気的特性と機能

ISL78322のメーカーはIntersilです、この部品の機能は「Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator」です。


製品の詳細 ( Datasheet PDF )

部品番号 ISL78322
部品説明 Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator
メーカ Intersil
ロゴ Intersil ロゴ 




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ISL78322 Datasheet, ISL78322 PDF,ピン配置, 機能
DATASHEET
Dual 2A/1.7A Low Quiescent Current 2.25MHz High
Efficiency Synchronous Buck Regulator
ISL78322
The ISL78322 is a high efficiency, dual synchronous step-down
DC/DC regulator that can deliver up to 2A/1.7A continuous
output current per channel. The channels are 180° out-of-phase
for input RMS current and EMI reduction. The supply voltage
range of 2.8V to 5.5V allows for the use of a single Li+ cell, three
NiMH cells or a regulated 5V input. The current mode control
architecture enables very low duty cycle operation at high
frequency with fast transient response and excellent loop
stability. The ISL78322 operates at 2.25MHz switching frequency
which allows for the use of small, low cost inductors and
capacitors. Each channel is optimized for generating an output
voltage as low as 0.6V.
The ISL78322 has a user configurable mode of operation-forced
PWM mode and PFM/PWM mode. The forced PWM mode
reduces noise and RF interference while the PFM mode provides
highest efficiency by reducing switching losses at light loads. In
PFM mode of operation, both channels draw a total quiescent
current of only 40µA, hence enabling high light load efficiency
and maximizing battery life.
The ISL78322 offers a 1ms Power-Good (PG) signal to monitor
both outputs at power-up. When shut down, ISL78322
discharges the output capacitors. Other features include internal
digital soft-start, enable for power sequence, overcurrent
protection, and thermal shutdown. The ISL78322 is offered in a
4mmx3mm, 12 Lead DFN package with 1mm maximum height.
The complete converter occupies less than 1.8cm2 area.
The ISL78322 is qualified to AEC-Q100 and specified for
operation across the -40°C to +105°C (grade 2) ambient
temperature range.
Features
• Dual 2A/1.7A high efficiency synchronous buck regulator with
up to 97% efficiency, low IQ (40µA)
• 180° out-of-phase outputs reduce ripple current and EMI
• Start-up with prebiased output prevents negative current flow
in output stage
• Selectable forced PWM mode and PFM mode
• External synchronization up to 8MHz
• Negative current detection and protection
• 100% maximum duty cycle for lowest dropout
• Internal current mode compensation
• Peak current limiting, hiccup mode short circuit protection and
over-temperature protection
• Pb-free (RoHs compliant)
• AEC-Q100 qualified component
Applications
• DC/DC POL modules
• µC/µP, FPGA and DSP power
• Automotive embedded processor power supply systems
100
90
80 2.5VOUT1 PFM
2.5VOUT1 PWM
70
3.3VOUT2 PFM
60
50 3.3VOUT2 PWM
2.25MHz 5VIN AT +25°C
400.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8
OUTPUT LOAD (A)
2.0
FIGURE 1. CHARACTERISTIC CURVE
August 26, 2014
FN7908.2
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 2012, 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





ISL78322 pdf, ピン配列
Block Diagram
ISL78322
SSOoFfTt -
S H U T D O W N S TSAtaRrTt
EN1
BANDG AP 0.6V
EAMP
27pF
250k
+
COMP
FB1
1.6k
3pF
SLOPE
COMP
+
0 .2 V
SCP
+
V IN
1M
+
0 .5 4 6 V
PG 1ms
DELAY
O S C IL L A T O R
VCC SHUTDOWN
PW M /PFM
LO G IC
CONTROLLER
P R O T E C T IO N
D R IV E R
+
OCP
+
CSA1
1.25V
+
S K IP
0.265V
N E G A T IV E
CURRENT LIM IT
ZERO - CROSS
S E N S IN G
S OS oF fTt-
S TSAtRa rTt
SHUTDOWN
EN2
B A N D G AP 0.6V
EAMP
27pF
250k
+
COMP
FB2
1.6k
3pF
SLOPE
COMP
+
0 .2 V
SCP
+
THERMAL
SHUT DOWN
SHUTDOWN
VCC
SHUTDOWN
PW M /PFM
L O G IC
CONTROLLER
PRO TECTIO N
D R IV E R
+
OCP
+
CSA2
1.1V
+
0 .5 4 6 V
+
S K IP
0.265V
N E G A T IV E
CURRENT LIM IT
ZERO-CROSS
S E N S IN G
V IN 1
LX1
PGND
SYNC
V IN 2
LX2
PGND
Submit Document Feedback
3
FN7908.2
August 26, 2014


3Pages


ISL78322 電子部品, 半導体
ISL78322
Electrical Specifications Unless otherwise noted, all parameter limits are established over the recommended operating
conditions: TA = -40°C to +105°C, VIN = 2.8V to 5.5V, EN1 = EN2 = VIN, SYNC = 0V, L = 1.2µH, C1 = 2 x 10µF, C2 = C4 = 22µF, IOUT1 = 0A to 2A,
IOUT2 = 0A to 1.7A. (Typical values are at TA = +25°C, VIN = 3.6V). Boldface limits apply across the operating temperature range,
-40°C to +105°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6)
UNITS
Negative Current Limit
LX1, LX2
Ivalley1
Ivalley2
-2.2 -1.6
-2.2 -1.6
-1
-1
A
A
P-Channel MOSFET ON-Resistance
N-Channel MOSFET ON-Resistance
LX_ Maximum Duty Cycle
VIN = 5.5V, IO = 200mA Channel 1
VIN = 5.5V, IO = 200mA Channel 2
VIN = 5.5V, IO = 200mA Channel 1
VIN = 5.5V, IO = 200mA Channel 2
90 115
100 125
80 103
90 112
100
mΩ
mΩ
mΩ
mΩ
PWM Switching Frequency
Synchronization Range
fSW
(Note 7)
1.8 2.25 2.7
5.4 8
MHz
MHz
Channel 1 to Channel 2 Phase Shift
Rising edge to rising edge timing
180 °
LX Minimum On Time
SYNC = High (forced PWM mode)
65 ns
Soft Discharge Resistance
PG
RDIS_ EN = LOW
80 100 130
Ω
Output Low Voltage
Sinking 1mA, VFB = 0.5V
0.4 V
PG Pin Leakage Current
PG Pull-up Resistor
PG = VIN = 3.6V
0.01
1
0.1
µA
MΩ
Internal PGOOD Low Rising Threshold
Percentage of nominal regulation voltage
85 91 97
%
Internal PGOOD Low Falling Threshold
Percentage of nominal regulation voltage
78 85 92
%
Delay Time (Rising Edge)
0.76 ms
Internal PGOOD Delay Time (Falling Edge)
24
µs
EN1, EN2, SYNC
Logic Input Low
0.4 V
Logic Input High
1.4 V
SYNC Logic Input Leakage Current
Enable Logic Input Leakage Current
Thermal Shutdown
ISYNC
IEN_
Pulled up to 5.5V
0.1 1
0.1 1
150
µA
µA
°C
Thermal Shutdown Hysteresis
25 °C
NOTES:
6. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
7. The operational frequency per switching channel will be half of the SYNC frequency.
Submit Document Feedback
6
FN7908.2
August 26, 2014

6 Page



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部品番号部品説明メーカ
ISL78322

Dual 2A/1.7A Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Intersil
Intersil


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