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PDF ISL8203M Data sheet ( Hoja de datos )
| Número de pieza | ISL8203M | |
| Descripción | Dual 3A/Single 6A Step-Down DC/DC Power Module | |
| Fabricantes | Intersil | |
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DATASHEET
Dual 3A/Single 6A Step-Down DC/DC Power Module
ISL8203M
The ISL8203M is an integrated step-down power module rated
for dual 3A output current or 6A current sharing operation.
Optimized for generating low output voltages down to 0.8V, the
ISL8203M is ideal for any low power low voltage applications.
The supply voltage range is from 2.85V to 6V. The two
channels are 180° out-of-phase for input RMS current and EMI
reduction. Each channel is capable of 3A output current. They
can be combined to form a single 6A output in current sharing
mode. While in current sharing mode, the interleaving of the
two channels reduces input and output voltage ripple.
The ISL8203M offers an independent Power-Good (PG) signal
for each channel. When shut down, the ISL8203M discharges
the output capacitor. Other features include internal digital
soft-start, enable for power sequence, overcurrent protection
and over-temperature protection.
The ISL8203M integrates a PWM controller, synchronous
switching MOSFETs, inductors and passive components to
maximize efficiency and minimize external component count.
The ISL8203M is available in a thermally-enhanced, compact
QFN package.
Features
• Dual 3A and single 6A switching power supply
• High efficiency, up to 95%
• Input voltage range: 2.85V to 6V
• Output voltage range: 0.8V to 5V
• Internal digital soft-start: 1.5ms
• External synchronization up to 4MHz
• Compact size: 9.0mmx6.5mmx1.83mm
• Peak current limiting and hiccup mode short-circuit
protection
• Overcurrent protection
Applications
• µC/µP, FPGA and DSP power
• Plug-in DC/DC modules for routers and switchers
• Test and measurement systems
• Barcode reader
Related Literature
• AN1941, “ISL8203MEVAL2Z Evaluation Board User Guide”
INPUT
2.85V TO 6V
2x22µF
VIN1
VIN2
VDD
EN1
EN2
SS
SYNC
VOUT1
1800pF
FB1
ISL8203M
SGND
VOUT2
1800pF
FB2
PGND
SGND
OUTPUT1
1.5V/3A
100k 3x22µF
113k
OUTPUT2
1.8V/3A
100k
3x22µF
80.6k
9mm
6.5mm
1.83mm
FIGURE 1. TYPICAL APPLICATION CIRCUIT - DUAL 3A
FIGURE 2. SMALL FOOTPRINT PACKAGE WITH LOW PROFILE
May 12, 2016
FN8661.4
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 2014-2016. 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  
ISL8203M
Absolute Maximum Ratings (Reference to SGND)
VIN1, VIN2, VDD . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V (DC) or 7V (20ms)
SW1, SW2 . . . . . . . . . . . -3V/(10ns)/-1.5V (100ns)/-0.3V (DC) to 6.5V (DC) or
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V (20ms)/8.5V(10ns)
EN1, EN2, PG1, PG2, SYNC, SS . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.5V
FB1, FB2, COMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V
ESD Ratings
Human Body Model (Tested per JESD22-A114) . . . . . . . . . . . . . . . .1.5kV
Charged Device Model (Tested per JESD22-C101E). . . . . . . . . . . . . . 1kV
Latch-Up (Tested per JESD-78A; Class 2, Level A) . . . . . . . . . . . . . . 100mA
Thermal Information
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
23 Ld QFN (Notes 4, 5) . . . . . . . . . . . . . . . .
15
2
Junction Temperature Range . . . . . . . . . . . . . . . . . . . . . . .-40°C to +125°C
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-55°C to +150°C
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
VIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.85V to 6V
Output Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.8V to 5V
Load Current Range per Channel . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 3A
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°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:
4. JA is measured in free air with the component mounted on the ISL8203MEVAL2Z evaluation board with “direct attach” features. See Tech Brief
TB379.
5. JC, “case temperature” location is at the center of the exposed metal pad on the package underside.
Electrical Specifications Unless otherwise noted, the typical specifications are measured at the following conditions: TA = +25°C,
VOUT = 1.2V. Boldface limits apply across internal junction temperature range, -40°C to +125°C.
SYMBOL
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 6) TYP (Note 6)
UNIT
INPUT SUPPLY
VUVLO
VIN Undervoltage Lockout Threshold
(Note 7)
Rising
Hysteresis
2.50 2.85
35 130
V
mV
IVIN Input Supply Current (Note 7)
OUTPUT REGULATION
VIN = 6V, EN1 = EN2 = 0, no load
42 µA
IOUT(DC)
Output Continuous Current Range
ΔVOUT1/VOUT1 Line Regulation
ΔVOUT2/VOUT2
ΔVOUT1/VOUT1 Load Regulation
ΔVOUT2/VOUT2
Output Voltage Accuracy
VIN = 5V, VOUT1 = 1.2V
VIN = 5V, VOUT2 = 1.2V
VIN = 5V, VOUT1 = 1.2V, in parallel mode
VIN = 2.85V to 6V, VOUT1 = 1.2V, no load
VIN = 2.85V to 6V, VOUT2 = 1.2V, no load
VIN = 2.85V to 6V, VOUT1 = 1.2V, IOUT1 = 3A
VIN = 2.85V to 6V, VOUT2 = 1.2V, IOUT2 = 3A
VIN = 5V, 2x22µF ceramic output capacitor
IOUT1 = 0A to 3A, VOUT1 = 1.2V
IOUT2 = 0A to 3A, VOUT2 = 1.2V
Over line/load/temperature range
03
03
06
0.25
0.25
0.25
0.25
1
1
-1.5 1.5
A
A
A
%
%
%
%
%
%
%
Over line/load/temperature/life range
-2.0 2.0 %
ΔVOUT
VFB
IFB
Output Ripple Voltage
FB1, FB2 Regulation Voltage (Note 7)
FB1, FB2 Bias Current (Note 7)
Soft-Start Ramp Time Cycle (Note 7)
VIN = 5V, 3x22µF ceramic output capacitor
IOUT1 = 0A, VOUT1 = 1.2V
IOUT2 = 0A, VOUT2 = 1.2V
IOUT1 = 3A, VOUT1 = 1.2V
IOUT2 = 3A, VOUT2 = 1.2V
VFB = 0.75V
SS = VDD
10 mVP-P
10 mVP-P
12 mVP-P
12 mVP-P
0.8 V
0.1 µA
1.5 ms
ISS Soft-Start Charging Current (Note 7)
456
µA
Submit Document Feedback
5
FN8661.4
May 12, 2016
5 Page 
ISL8203M
Functional Description
PWM Control Scheme
Each channel of the ISL8203M employs the current-mode
Pulse-Width Modulation (PWM) control scheme for fast transient
response and pulse-by-pulse current limiting, as shown in the
“INTERNAL BLOCK DIAGRAM” on page 2 and with waveforms in
Figure 24. The current loop consists of the oscillator, the PWM
comparator COMP, current sensing circuit, and the slope
compensation for the current loop stability. The current sensing
circuit consists of the resistance of the P-MOSFET when it is turned
on and the current sense amplifier CSA1 (or CSA2 of Channel 2).
The gain for the current sensing circuit is typically 0.2V/A. The
control reference for the current loops comes from the error
amplifier EAMP of the voltage loop.
The PWM operation is initialized by the clock from the oscillator.
The P-channel MOSFET is turned on at the beginning of a PWM
cycle and the current in the MOSFET starts to ramp up. When the
sum of the current amplifier CSA1 (or CSA2 of channel 2) and the
compensation slope (0.46V/µs) reaches the control reference of
the current loop, the PWM comparator COMP sends a signal to the
PWM logic to turn off the P-MOSFET and to turn on the N-channel
MOSFET. The N-MOSFET stays on until the end of the PWM cycle.
Figure 24 shows the typical operating waveforms during the PWM
operation, where the dotted lines illustrate the sum of the
compensation ramp and the current-sense amplifier output VCSA1,
VEAMP represents the output of the error amplifier, and IL
represents the inductor current.
VEAMP
VCSA1
DUTY
CYCLE
IL
VOUT
FIGURE 24. PWM OPERATION WAVEFORMS
The output voltage is regulated by controlling the reference
voltage to the current loop. The bandgap circuit outputs a 0.8V
reference voltage to the voltage control loop. The feedback signal
comes from the FB pin. The soft-start circuitry only affects the
operation during start-up and will be discussed separately;
please refer to “Soft-Start” on page 12. The voltage loop is
internally compensated for the dual output mode. For parallel
current sharing mode, external compensation is required.
Synchronization Control
The frequency of operation can be synchronized up to 4MHz by
an external signal applied to the SYNC pin. The 1st falling edge
on the SYNC triggers the rising edge of the PWM ON pulse of
Channel 1. The 2nd falling edge of the SYNC triggers the rising
edge of the PWM ON pulse of Channel 2. This process alternates
indefinitely allowing 180° out-of-phase operation between the
two channels. The switching frequency per channel is half of the
external signal’s frequency applied to the SYNC pin. The
maximum external signal frequency is limited by the SW
minimum on time (140ns MAX) requirement. The maximum
external signal frequency can be calculated as shown in
Equation 1.
12--
f
S
Y
N
C
–
M
A
X
=
fSW – MAX V----V-O---I-U-N---T-- 1----4---01----n----s-
(EQ. 1)
Where:
• fSYNC-MAX is the maximum external signal frequency
• fSW-MAX is the maximum switching frequency per channel
• VOUT is the output voltage
• VIN is the input voltage
Output Current Sharing
The ISL8203M’s two channels can be paralleled for dual-phase
operation in order to support a 6A output. In the parallel mode,
the two channels are 180° out-of-phase, which reduces input
and output voltage ripple and EMI. Connect VOUT1 to VOUT2, FB1
to FB2, EN1 to EN2, PG1 to PG2 and connect a soft-start
capacitor CSS from SS to SGND; refer to Figure 22. In parallel
mode, external compensation network of a resistor and a
capacitor is required with the typical values of 30.1kΩ and
270pF; refer to Figure 22.
Similar to the dual-phase operation, multiple modules can be
paralleled for higher current capability. Connect all the modules’
FB pins, COMP pins, SS pins, EN pins and PG pins; refer to
Figure 23.
Overcurrent Protection
Current sense amplifiers CSA1 and CSA2 are used to monitor the
two channels’ internal inductor current, respectively. The
overcurrent protection is realized by monitoring the CSA output
with the OCP threshold logic, as shown in Figure 2 on page 1. The
current sensing circuit has a gain of 0.2V/A, from the P-MOSFET
current to the CSA_ output. When the CSA1 output reaches the
threshold, the OCP comparator is tripped to turn off the
P-MOSFET immediately. The overcurrent function protects the
module from a shorted output by monitoring the current flowing
through the upper MOSFETs.
Upon detection of an overcurrent condition, the upper MOSFET
will be immediately turned off and will not be turned on again
until the next switching cycle. Upon detection of the initial
overcurrent condition, the overcurrent fault counter is set to 1
and the overcurrent condition flag is set from LOW to HIGH. If, on
the subsequent cycle, another overcurrent condition is detected,
the OC fault counter will be incremented. If there are 17
sequential OC fault detections, the module will shut down under
an overcurrent fault condition. An overcurrent fault condition will
result in the module attempting to restart in a hiccup mode with
the delay between restarts being 8 soft-start periods. At the end
of the eighth soft-start wait period, the fault counters are reset
and soft-start is attempted again. If the overcurrent condition
goes away prior to the OC fault counter reaching a count of four,
the overcurrent condition flag will set back to LOW.
Submit Document Feedback 11
FN8661.4
May 12, 2016
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet ISL8203M.PDF ] | |
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