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PDF ISL6237 Data sheet ( Hoja de datos )
| Número de pieza | ISL6237 | |
| Descripción | Main Power Supply Controllers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
March 16, 2007
ISL6237
FN6418.1
High-Efficiency, Quad-Output, Main Power
Supply Controllers for Notebook
Computers
The ISL6237 dual step-down, switch-mode power-supply
(SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6237 includes two
pulse-width modulation (PWM) controllers, 5V/3.3V and
1.5V/1.05V. The output of SMPS1 can also be adjusted from
0.7V to 5.5V. The SMPS2 output can be adjusted from 0.5V to
2.5V by setting REFIN2 voltage. This device features a linear
regulator providing 3.3V/5V, or adjustable from 0.7V to 4.5V
output via LDOREFIN. The linear regulator provides up to
100mA output current with automatic linear-regulator
bootstrapping to the BYP input. When in switchover, the LDO
output can source up to 200mA. The ISL6237 includes
on-board power-up sequencing, power-good (POK_) outputs,
digital soft-start, and internal soft-stop output discharge that
prevents negative voltages on shutdown.
Constant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load
transients while maintaining a relatively constant switching
frequency. The unique ultrasonic pulse-skipping mode
maintains the switching frequency above 25kHz, which
eliminates noise in audio applications. Other features include
pulse skipping, which maximizes efficiency in light-load
applications, and fixed-frequency PWM mode, which reduces
RF interference in sensitive applications.
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL6237IRZ
(Note)
ISL6237 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
ISL6237IRZ-T ISL6237 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
(Note)
Tape and Reel
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are RoHS compliant and compatible
with both SnPb and Pb-free soldering operations. Intersil Pb-free
products are MSL classified at Pb-free peak reflow temperatures that
meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020.
Features
• Wide Input Voltage Range 5.5V to 25V
• Dual Fixed 1.05V/3.3V and 1.5V/5.0V Outputs or
Adjustable 0.7V to 5.5V (SMPS1) and 0.5V to 2.5V
(SMPS2), ±1.5% Accuracy
• 1.7ms Digital Soft-Start and Independent Shutdown
• Fixed 3.3V/5.0V, or Adjustable Output 0.7V to 4.5V,
±1.5% (LDO): 200mA
• 2.0V Reference Voltage
• Constant ON-TIME Control with 100ns Load-Step
Response
• Selectable Switching Frequency
• rDS(ON) Current Sensing
• Programmable Current Limit with Foldback Capability
• Selectable PWM, Skip or Ultrasonic Mode
• BOOT Voltage Monitor with Automatic Refresh
• Independent POK1 and POK2 Comparators
• Soft-Start with Pre-Biased Output and Soft-Stop
• Independent ENABLE
• High Efficiency - Up to 97%
• Very High Light Load Efficiency (Skip Mode)
• 5mW Quiescent Power Dissipation
• Thermal Shutdown
• Extremely Low Components Count
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Notebook and Sub-Notebook Computers
• PDAs and Mobile Communication Devices
• 3-Cell and 4-Cell Li+ Battery-Powered Devices
• DDR1, DDR2, and DDR3 Power Supplies
• Graphic Cards
• Game Consoles
• Telecommunication
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL6237
Electrical Specifications
PARAMETER
No load on LDO, OUT1, OUT2, and REF, VIN = 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V,
VEN_LDO = 5V, TA = -40°C to +100°C, unless otherwise noted. Typical values are at TA = +25°C. (Continued)
CONDITIONS
MIN TYP MAX UNITS
Undervoltage-Lockout Fault Threshold
Rising edge of PVCC
4.35 4.5
V
Falling edge of PVCC
3.9 4.05
V
LDO 5V Bootstrap Switch Threshold to BYP Rising edge at BYP regulation point
LDOREFIN = GND
4.53 4.68 4.83
V
LDO 3.3V Bootstrap Switch Threshold to
BYP
Rising edge at BYP regulation point
LDOREFIN = VCC
3.0 3.1 3.2 V
LDO 5V Bootstrap Switch Equivalent
Resistance
LDO to BYP, BYP = 5V, LDOREFIN > (VCC - 1V),
Guaranteed by design
0.7 1.5 Ω
LDO 3.3V Bootstrap Switch Equivalent
Resistance
LDO to BYP, BYP = 3.3V, LDOREFIN < 0.3V, Guaranteed
by design
1.5 3.0 Ω
REF Output Voltage
No external load
1.980 2.000 2.020
V
REF Load Regulation
REF Sink Current
0 < ILOAD < 50µA
REF in regulation
10
10
mV
µA
VIN Operating Supply Current
VIN Standby Supply Current
VIN Shutdown Supply Current
Quiescent Power Consumption
FAULT DETECTION
Both SMPSs on, FB1 = SKIP# = GND, REFIN2 = VCC
VOUT1 = BYP = 5.3V, VOUT2 = 3.5V
VIN = 5.5V to 25V, both SMPSs off, EN_LDO = VCC
VIN = 4.5V to 25V, EN1 = EN2 = EN_LDO = 0V
Both SMPSs on, FB1 = SKIP# = GND, REFIN2 = VCC,
VOUT1 = BYP = 5.3V, VOUT2 = 3.5V
25 50 µA
180 250 µA
20 30 µA
5 7 mW
Overvoltage Trip Threshold
FB1 with respect to nominal regulation point
+8 +11 +14 %
REFIN2 with respect to nominal regulation point
+12 +16 +20 %
Overvoltage Fault Propagation Delay
FB1 or REFIN2 delay with 50mV overdrive
10 µs
POK_ Threshold
FB1 or REFIN2 with respect to nominal output, falling
edge, typical hysteresis = 1%
-12 -9
-6 %
POK_ Propagation Delay
Falling edge, 50mV overdrive
10 µs
POK_ Output Low Voltage
POK_ Leakage Current
ISINK = 4mA
High state, forced to 5.5V
0.2 V
1 µA
Thermal-Shutdown Threshold
+150
°C
Output Undervoltage Shutdown Threshold FB1 or REFIN2 with respect to nominal output voltage 65 70 75 %
Output Undervoltage Shutdown Blanking
Time
From EN_ signal
10 20 30 ms
INPUTS AND OUTPUTS
FB1 Input Voltage
Low level
0.3 V
High level
VCC - 1.0
V
REFIN2 Input Voltage
OUT2 Dynamic Range, VOUT2 = VREFIN2
Fixed OUT2 = 1.05V
0.5 2.50 V
3.0 VCC - 1.1 V
Fixed OUT2 = 3.3V
VCC - 1.0
V
LDOREFIN Input Voltage
Fixed LDO = 5V
0.30 V
LDO Dynamic Range, VLDO = 2 x VLDOREFIN
Fixed LDO = 3.3V
0.35
VCC - 1.0
2.25 V
V
5 FN6418.1
March 16, 2007
5 Page 
ISL6237
Typical Performance Curves
Circuit of Figure 62 and Figure 63, no load on LDO, OUT1, OUT2, and REF, VIN = 12V,
EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V, VEN_LDO = 5V, TA = -40°C to +100°C, unless
otherwise noted. Typical values are at TA = +25°C. (Continued)
1.518
1.530
1.516
1.514
1.512
1.510
1.508
1.506
NO LOAD PWM
MID LOAD PWM
MAX LOAD PWM
1.525
1.520
1.515
1.510
1.505
NO LOAD PWM
MID LOAD PWM
MAX LOAD PWM
1.504
5 7 9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 15. VOUT1 = 1.5V OUTPUT VOLTAGE REGULATION
vs VIN (PWM MODE)
1.500
5 7 9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 16. VOUT1 = 1.5V OUTPUT VOLTAGE REGULATION
vs VIN (SKIP MODE)
3.340
3.335
3.330
NO LOAD PWM
3.325
3.320
3.315
MID LOAD PWM
MAX LOAD PWM
3.310
7 9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 17. VOUT2 = 3.3V OUTPUT VOLTAGE REGULATION
vs VIN (PWM MODE)
3.380
3.370
3.360
3.350
3.340
MAX LOAD PWM
NO LOAD PWM
3.330
3.320
3.310
MID LOAD PWM
3.300
7
9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 18. VOUT2 = 3.3V OUTPUT VOLTAGE REGULATION
vs VIN (SKIP MODE)
5.065
5.060
5.055
5.050
NO LOAD PWM
MAX LOAD PWM
MID LOAD PWM
5.045
5.040
7
9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 19. VOUT1 = 5V OUTPUT VOLTAGE REGULATION vs
VIN (PWM MODE)
11
5.140
5.120
5.100
5.080
5.060
MID LOAD PWM
NO LOAD PWM
5.040
5.020
7
MAX LOAD PWM
9 11 13 15 17 19 21 23 25
INPUT VOLTAGE (V)
FIGURE 20. VOUT1 = 5V OUTPUT VOLTAGE REGULATION vs
VIN (SKIP MODE)
FN6418.1
March 16, 2007
11 Page | ||
| Páginas | Total 34 Páginas | |
| PDF Descargar | [ Datasheet ISL6237.PDF ] | |
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