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®
Data Sheet
April 7, 2006
ISL6442
FN9204.1
Dual (180° Out-of-Phase) PWM and Linear
Controller
The ISL6442 is a high-performance, triple output controller
that provides a single high-frequency power solution
primarily for Broadband, DSL and Networking applications.
This device integrates complete control, monitoring and
protection functions for two synchronous buck PWM
controllers and one linear controller. Input voltage ripple and
total RMS input current is substantially reduced by
synchronized 180° out-of-phase operation of the two PWMs.
The two PWM buck converters provide simple voltage mode
control. The output voltage of the converters can be
precisely regulated to as low as 0.6V, with a maximum
tolerance of ±1.5% over temperature and line variations.
Programmable switching frequency up to 2.5MHz provides
fast transient response and small external components. The
linear controller provides a low-current output.
The ISL6442 has voltage-tracking capability. Each controller
has soft-start and independent enable functions combined
on a single pin. A capacitor from SS/EN to ground sets the
soft-start time; pulling SS/EN pin below 1V disables the
controller. Both outputs can soft-start into a pre-biased load.
The ISL6442 incorporates robust protection features. An
adjustable overcurrent protection circuit monitors the output
current by sensing the voltage drop across the upper
MOSFET rDS(ON). Hiccup mode overcurrent operation
protects the DC/DC converters from damage under over-
load and short circuit conditions. A PGOOD signal is issued
when soft-start is complete and PWM outputs are within 10%
of their regulated values and the linear regulator output is
higher than 75% of its nominal value. Thermal shut-down
circuitry turns the device off if the IC temperature exceeds
150°C.
Ordering Information
PART
PART
TEMP.
PKG.
NUMBER* MARKING RANGE (°C) PACKAGE DWG. #
ISL6442IA ISL6442IA -40 to 85 24 Ld QSOP M24.15
ISL6442IAZ ISL6442IAZ -40 to 85 24 Ld QSOP M24.15
(Note)
(Pb-free)
* Add “-TK” to suffix for 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
• 4.5V to 5.5V or 5.5V to 24V Input Voltage Range
• ±1.5% PWM Switcher Reference Accuracy Over Line and
Temperature
• Three Programmable Power Output Voltages
- Two PWM Controllers with Out-of-Phase Operation
- Voltage-Mode PWM Control
- One Linear Controller
• Programmable Switching Frequency from 300kHz to 2.5MHz
• Fast Transient Response
- High-Bandwidth Error Amplifier
• Extensive Circuit Protection Functions
- Overvoltage, Undervoltage, and Overtemperature
- Programmable Overcurrent Limit with Hiccup Mode
Operation
- Lossless Current Sensing (no Sense Resistor needed)
• Externally Adjustable Soft-Start Time
- Independent Enable Control
- Voltage Tracking Capability
- Able to Soft-Start into a Pre-Biased Load
• PGOOD Output with Delay
• 24 Ld QSOP
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Complete 1 Chip Solution for DSL Modems/Routers
• DSP, ASIC, and FPGA Point of Load Regulation
• ADSL, Broadband and Networking Applications
Pinout
ISL6442 (QSOP)
TOP VIEW
OCSET1 1
SS1/EN1 2
COMP1 3
FB1 4
RT 5
SGND 6
LCDR 7
LCFB 8
FB2 9
COMP2 10
SS2/EN2 11
OCSET2 12
24 VIN
23 BOOT1
22 UGATE1
21 PHASE1
20 LGATE1
19 VCC
18 PGND
17 LGATE2
16 PHASE2
15 UGATE2
14 BOOT2
13 PGOOD
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. 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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Block Diagram
REFERENCE
BIAS CURRENT
30µA 100µA 0.6V
ISL6442
VCC
VCC
POWER
ON
RESET
AND CONTROL
VIN
5V LINEAR
REGULATOR
COMP1
FB1
0.6V
VCC5
VCC5
30µA
30µA
SS1/EN1
SS2/EN2
FB2
COMP2
0.6V
FAULT1
UVP1
OVP1
PG1
EN1
SS1
STARTUP
SS1 EN1
1V DET
SS2 EN2
FAULT2
UVP2
OVP2
PG2
EN2
SS2
RT
PGOOD
PG1
PG2
PG3
PWM1
RAMP1
0 DEG
CLOCK AND
SAWTOOTH
GENERATOR
RAMP2
180 DEG
PWM2
110µA
VCC
UVP1
OVP1
PG1
EN1
OUTPUT1
DRIVERS
GATE CONTROL
LOGIC
VCC
DEAD-TIME
CONTROL
OVERCURRENT
PGND
OCSET1
BOOT1
UGATE1
PHASE1
LGATE1
110µA
VCC
UVP2
OVP2
PG2
EN2
OUTPUT2
DRIVERS
GATE CONTROL
LOGIC VCC
DEAD-TIME
CONTROL
OVERCURRENT
PGND
FAULT3
PG3 LCFB
OCSET2
BOOT2
UGATE2
PHASE2
LGATE2
0.6V
LCFB
LCDR
SGND
2
FIGURE 1. BLOCK DIAGRAM
PGND
FN9204.1
April 7, 2006

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Typical Application Schematics
VOLTAGE INPUTS REQUIRED
VIN (4.5 to 24V) = VIN1 = VIN2
VCC (5V; internal if VIN > 5.6V)
VIN3 (<= VCC) for linear
TYPE3 COMPENSATION SHOWN
C102
VOUT1
R102 C101
R101
R103
C103
C202
R100
VOUT2
R202
R201
C201
R203 C203
R200
TYPE3 COMPENSATION SHOWN
VCC
RPGOOD
CSS1/EN1 CSS2/EN2 RRT
ISL6442
ISL6442
VCC
VIN
OPTIONAL
CONNECTION (FOR
CVCC CVIN
VIN = VCC = 5V)
VCC
ROCSET1
VIN1 = VIN
VIN
COMP1
FB1
OCSET1
BOOT1
COCSET1
CBOOT1
Q101
CIN1
UGATE1
COMP2
PHASE1
LGATE1
L100
Q102
VOUT1
COUT1
FB2
ROCSET2
VIN2 = VIN
ISL6442
OCSET2
BOOT2
UGATE2
PHASE2
COCSET2
CBOOT2
Q201
CIN2
L200
VOUT2
PGOOD
RT
SS1/EN1
SS2/EN2
SGND
LGATE2
LCDR
LCFB
PGND
Q202
COUT2
R303
C3R01302
Q301
VIN3
CIN3
R300
R301
VOUT3
COUT3
FIGURE 2. TYPICAL APPLICATION
3
FN9204.1
April 7, 2006

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ISL6442
Absolute Maximum Ratings (Note 1)
SS1/EN1, SS2/EN2, COMP1, COMP2 to SGND . . . -0.3V to +6.0V
VCC, FB1, FB2, RT, PGOOD to SGND . . . . . . . . . . . -0.3V to +6.0V
LCDR, LCFB to SGND. . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6.0V
VIN, OCSET1, and OCSET2 to PGND . . . . . . . . . . . . -0.3V to +28V
BOOT1 and BOOT2 to PGND . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT1 to PHASE1, and BOOT2 to PHASE2 . . . . . . -0.3V to +6.0V
UGATE1 to PHASE1 . . . . . . . . . . . . . . . . . -0.3V to (BOOT1 +0.3V)
UGATE2 to PHASE2 . . . . . . . . . . . . . . . . . -0.3V to (BOOT2 +0.3V)
LGATE1, LGATE2 to PGND . . . . . . . . . . . . . . -0.3V to (VCC+0.3V)
PHASE1, PHASE2 to PGND . . . . . . . . . . . . . . . . . . . . . . -1V to 28V
SGND to PGND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V
Thermal Information
Thermal Resistance (Typical, Note 2)
θJA (°C/W)
QSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . .
85
Maximum Junction Temperature (Plastic Package). . -55°C to 150°C
Maximum Storage Temperature Range . . . . . . . . . . . -65°C to 150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
Recommended Operating Conditions
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to +85°C
VCC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V ±10%
VIN Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V to 24V
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTES:
1. All voltages are measured with respect to GND.
2. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
3. Guaranteed by design only; not production tested.
4. Design guideline only; not production tested
Electrical Specifications
Operating Conditions
values are at 25°C.
Unless
Otherwise
Noted:
VIN
=
12V,
or
VCC
=
5V
±10%,
TA
=
-40°C
to
+85°C.
Typical
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
MAX
UNITS
VIN SUPPLY
Input Operating Supply Current
ICC_op
VIN = 5.5V or 12V; LGATEx, UGATEx Open,
-
4.5
7.5
FB forced above regulation point (no
switching)
mA
VIN = 24V
- 50 70 mA
Input Standby Supply Current
ICC_sb
VIN = 5.5V, 12V, 24V;
SS1/EN1 = SS2/EN2 = 0V
- 1.25
2
mA
VCC INTERNAL REGULATOR
Output Voltage
Maximum Output Current
VCC Current Limit (Note 3)
REFERENCE AND SOFT-START
VVCC
IICC_max
IICC_CL
VIN > 5.5V
VIN = 12V
VCC is pulled to PGND; (Note 4)
4.5 5.2
80 -
- 300
5.5
-
-
V
mA
mA
Reference Voltage at FB1, FB2
Reference Voltage at FB1, FB2
ENx/SSx Soft-Start Current
ENx/SSx Enable Threshold
ENx/SSxEnable Threshold
Hysteresis
VREF1,
VREF2
VREF1,
VREF2
ISSx
VENx
VENx_hys
VIN = 5V or 12V; TA = 25°C
VIN = 5V or 12V; TA = 0°C to +85°C
VIN = 5V or 12V; TA = -40°C to +85°C
VIN = 24V; TA = 25°C
VIN = 24V; TA = 0°C to +85°C
VIN = 24V; TA = -40°C to +85°C
(Note 3)
-
0.5925
0.5900
-
0.5940
0.5915
20
0.8
-
0.6000
-
-
0.6015
-
-
30
1.0
50
-
0.6085
0.6085
-
0.6100
0.6100
40
1.2
-
V
V
V
V
V
V
µA
V
mV
4 FN9204.1
April 7, 2006

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ISL6442
Electrical Specifications
Operating Conditions Unless Otherwise
values are at 25°C. (Continued)
Noted:
VIN
=
12V,
or
VCC
=
5V
±10%,
TA
=
-40°C
to
+85°C.
Typical
PARAMETER
SYMBOL
TEST CONDITIONS
MIN TYP
MAX
UNITS
ENx/SSx Soft-Start Top of Ramp
Voltage
VSSx_top
(Note 3)
- 3.2
-
V
POWER-ON RESET ON VCC
Rising Threshold
Falling Threshold
PWM CONVERTERS
VPOR_r
VPOR_f
4.2 4.4
3.85 4.0
4.475
4.1
V
V
Minimum UGATE on Time
Maximum Duty Cycle
Maximum Duty Cycle
FBx Pin Bias Current
OSCILLATOR
tUGATE_min (Note 3)
DCmax
VIN = 4.5 or 12V; FSW = 300kHz
DCmax
VIN = 4.5V; FSW = 2.5MHz
IFBx (Note 3)
- 100
95 -
80 -
- 80
-
-
-
-
ns
%
%
nA
Low End Frequency
FSW
VIN = 5V or 12V; RT = 52.3k
VIN = 24V; RT = 52.3k
270 300
270 305
330
340
kHz
kHz
High End Frequency
FSW
VIN = 5V; RT = 5.23k
VIN = 12V; RT = 5.23k
2.25 2.5
2.25 2.55
2.75
2.85
MHz
MHz
Frequency Adjustment Range
FSW
RT = 52.3k; (Note 3)
RT = 5.23k; (Note 3)
- 0.3 - MHz
- 2.5 - MHz
PWM Sawtooth Ramp Amplitude VPP
(peak-peak)
(Note 4)
- 1.25
-
V
PWM CONTROLLER GATE DRIVERS
Gate Drive Peak Current
(Note 3)
- 0.7
-
A
Rise Time
Fall Time
Dead Time Between Drivers
(Note 3); CL = 1000pF
(Note 3); CL = 1000pF
(Note 3)
- 20
- 20
- 30
-
-
-
ns
ns
ns
ERROR AMPLIFIERS
DC Gain
Gain
(Note 4)
- 88
-
dB
Gain-Bandwidth Product
GBWP
(Note 4)
- 15 - MHz
Slew Rate
SR (Note 4); COMP = 10pF
-5
- V/µs
Maximum Output Voltage
VEA_max
PROTECTION and OUTPUT MONITOR
VCC = 5V; RL = 10k to ground
3.9 4.4
-
Overvoltage Threshold
OV
113 116
121
%
Undervoltage Threshold
UV
78 82
88
%
OCSET Current Source
LINEAR CONTROLLER
IOCSET
VOCSET = 4.5V
80 110
140
µA
Drive Sink Current
LCFB Feedback Threshold
LCFB Input Leakage Current
ILCDR
VLCFB
ILCFB
LCDR
TA = 25°C
TA = -40°C to +85°C
(Note 3)
50
-
0.570
-
-
0.595
-
80
-
-
0.620
-
mA
V
V
nA
5 FN9204.1
April 7, 2006