DATASHEET
ISL6236
High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook
Computers
The ISL6236 dual step-down, switch-mode power-supply
(SMPS) controller generates logic-supply voltages in
battery-powered systems. The ISL6236 include 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 0V to
2.5V by setting REFIN2 voltage. An optional external charge
pump can be monitored through SECFB. 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 ISL6236 includes
on-board power-up sequencing, the power-good (POK)
outputs, digital soft-start, and internal soft-stop output
discharge that prevents negative voltages on shutdown.
A 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.
FN6373
Rev 6.00
April 29, 2010
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 0V to 2.5V
(SMPS2), ±1.5% Accuracy
• Secondary Feedback Input (Maintains Charge Pump
Voltage)
• 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
• 3.3V Reference Voltage ±2.0%: 5mA
• 2.0V Reference Voltage ±1.0%: 50µA
• Constant ON-time Control with 100ns Load-Step
Response
• Frequency Selectable
• r
DS(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
Ordering Information
PART
NUMBER
(Note)
ISL6236IRZA
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
• Independent ENABLE
• High Efficiency - up to 97%
• Very High Light Load Efficiency (Skip Mode)
• 5mW Quiescent Power Dissipation
• Thermal Shutdown
• Extremely Low Component Count
• Pb-Free (RoHS Compliant)
ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
ISL6236IRZA-T* ISL6236 IRZ -40 to +100 32 Ld 5x5 QFN L32.5x5B
(Tape and
Reel)
*Please refer to TB347 for details on reel specifications.
NOTES:
1. These Intersil Pb-free plastic packaged products employ special
Pb-free material sets, molding compounds/die attach materials,
and 100% matte tin plate plus anneal (e3 termination finish, which
is 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.
2.
For Moisture Sensitivity Level (MSL), please see device
information page for
ISL6236.
For more information on
MSL please see techbrief
TB363.
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
• Telecommunications
FN6373 Rev 6.00
April 29, 2010
Page 1 of 36
ISL6236
Pinout
ISL6236
(32 LD 5x5 QFN)
TOP VIEW
PHASE2
25
24 BOOT2
23 LGATE2
22 PGND
21 GND
20 SECFB
19 PVCC
18 LGATE1
17 BOOT1
9
BYP
10
OUT1
11
FB1
12
ILIM1
13
POK1
14
EN1
15
UGATE1
16
PHASE1
UGATE2
26
REFIN2
POK2
28
OUT2
ILIM2
SKIP
EN2
27
32
REF
TON
VCC
EN LDO
VREF3
VIN
LDO
LDOREFIN
1
2
3
4
5
6
7
8
31
30
29
FN6373 Rev 6.00
April 29, 2010
Page 2 of 36
ISL6236
Absolute Voltage Ratings
VIN, EN LDO to GND. . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +27V
BOOT to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +33V
BOOT to PHASE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +6V
VCC, EN, SKIP, TON, PVCC, POK to GND . . . . . . . . . -0.3V to +6V
LDO, FB1, REFIN2, LDOREFIN to GND . . . -0.3V to (VCC + 0.3V)
OUT, SECFB, VREF3, REF to GND . . . . . . . . -0.3V to (VCC + 0.3V
UGATE to PHASE . . . . . . . . . . . . . . . . . . . . -0.3V to (PVCC + 0.3V)
ILIM to GND . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
LGATE, BYP to GND . . . . . . . . . . . . . . . . . . -0.3V to (PVCC + 0.3V)
PGND to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +0.3V
LDO, REF, VREF3 Short Circuit to GND . . . . . . . . . . . . Continuous
VCC Short Circuit to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1s
LDO Current (Internal Regulator) Continuous . . . . . . . . . . . . 100mA
LDO Current (Switched Over to OUT1) Continuous . . . . . . +200mA
Thermal Information
Thermal Resistance (Typical)
JA
(°C/W)
JC
(°CW)
32 Ld QFN (Notes 3, 4) . . . . . . . . . . . . 32
3.0
Operating Temperature Range . . . . . . . . . . . . . . . .-40°C to +100°C
Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C
Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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:
3.
JA
is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
4. For
JC
, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
No load on LDO, OUT1, OUT2, V
REF3
, and REF, V
IN
= 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V,
VEN_LDO = 5V, T
A
= -40°C to +100°C, unless otherwise noted. Typical values are at T
A
= +25°C.
Boldface
limits apply over the operating temperature range, -40°C to +85°C.
CONDITIONS
MIN
(Note 6)
TYP
MAX
(Note 6)
UNITS
PARAMETER
MAIN SMPS CONTROLLERS
V
IN
Input Voltage Range
3.3V Output Voltage in Fixed Mode
1.05V Output Voltage in Fixed Mode
1.5V Output Voltage in Fixed Mode
5V Output Voltage in Fixed Mode
FB1 in Output Adjustable Mode (Note 7)
REFIN2 in Output Adjustable Mode
SECFB Voltage
SMPS1 Output Voltage Adjust Range
SMPS2 Output Voltage Adjust Range
SMPS2 Output Voltage Accuracy
(Referred for REFIN2)
DC Load Regulation
LDO in regulation
5.5
4.5
3.285
1.038
1.482
4.975
0.693
0.7
1.920
0.70
0.50
-1.0
-0.1
-1.7
-1.5
0.005
4.75
0.2
5
2.00
3.330
1.05
1.500
5.050
0.700
25
5.5
3.375
1.062
1.518
5.125
0.707
2.50
2.080
5.50
2.50
1.0
V
V
V
V
V
V
V
V
V
V
V
%
%
%
%
%/V
V
IN
= LDO, VOUT1 <4.43V
V
IN
= 5.5V to 25V, REFIN2 > (VCC - 1V), SKIP = 5V
V
IN
= 5.5V to 25V, 3.0 < REFIN2 < (VCC - 1.1V),
SKIP = 5V
V
IN
= 5.5V to 25V, FB1 = VCC, SKIP = 5V
V
IN
= 5.5V to 25V, FB1 = GND, SKIP = 5V
V
IN
= 5.5V to 25V
V
IN
= 5.5V to 25V
V
IN
= 5.5V to 25V
SMPS1
SMPS2
REFIN2 = 0.7V to 2.5V, SKIP = VCC
Either SMPS, SKIP = VCC, 0A to 5A
Either SMPS, SKIP = REF, 0A to 5A
Either SMPS, SKIP = GND, 0A to 5A
Line Regulation
Current-Limit Current Source
ILIM Adjustment Range
Current-Limit Threshold (Positive, Default)
ILIM = VCC, GND - PHASE
(No temperature compensation)
Either SMPS, 6V < V
IN
< 24V
Temperature = +25°C
5.25
2
µA
V
mV
93
100
107
FN6373 Rev 6.00
April 29, 2010
Page 3 of 36
ISL6236
Electrical Specifications
No load on LDO, OUT1, OUT2, V
REF3
, and REF, V
IN
= 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V,
VEN_LDO = 5V, T
A
= -40°C to +100°C, unless otherwise noted. Typical values are at T
A
= +25°C.
Boldface
limits apply over the operating temperature range, -40°C to +85°C. (Continued)
CONDITIONS
GND - PHASE
V
ILIM
= 0.5V
V
ILIM
= 1V
V
ILIM
= 2V
Zero-Current Threshold
SKIP = GND, REF, or OPEN, GND - PHASE
Current-Limit Threshold (Negative, Default) SKIP = VCC, GND - PHASE
Soft-Start Ramp Time
Operating Frequency
Zero to full limit
(V
tON
= GND), SKIP = VCC
(V
tON
= REF or OPEN),
SKIP = VCC
(V
tON
= VCC), SKIP = VCC
ON-Time Pulse Width
V
tON
= GND (400kHz/500kHz)
V
tON
= REF or OPEN
(400kHz/300kHz)
V
tON
= VCC (200kHz/300kHz)
Minimum OFF-Time
T
A
= -40°C to +100°C
T
A
= -40°C to +85°C
Maximum Duty Cycle
V
tON
= GND
V
tON
= REF or OPEN
V
tON
= VCC
Ultrasonic SKIP Operating Frequency
SKIP = REF or OPEN
V
OUT1
= 5.05V
V
OUT2
= 3.33V
V
OUT1
= 5.05V
V
OUT2
= 3.33V
V
OUT1
= 5.05V
V
OUT2
= 3.33V
25
SMPS 1
SMPS 2
SMPS 1
SMPS 2
SMPS 1
SMPS 2
V
OUT1
= 5.00V
V
OUT2
= 3.33V
V
OUT1
= 5.05V
V
OUT2
= 3.33V
V
OUT1
= 5.05V
V
OUT2
= 3.33V
0.895
0.475
0.895
0.833
1.895
0.833
200
200
MIN
(Note 6)
40
93
185
TYP
50
100
200
3
-120
1.7
400
500
400
300
200
300
1.052
0.555
1.052
0.925
2.105
0.925
300
300
88
85
88
91
94
91
37
1.209
0.635
1.209
1.017
2.315
1.017
425
410
MAX
(Note 6)
60
107
215
UNITS
mV
mV
mV
mV
mV
ms
kHz
kHz
kHz
kHz
kHz
kHz
µs
µs
µs
µs
µs
µs
ns
ns
%
%
%
%
%
%
kHz
PARAMETER
Current-Limit Threshold
(Positive, Adjustable)
INTERNAL REGULATOR AND REFERENCE
LDO Output Voltage
LDO Output Voltage
LDO Output in Adjustable Mode
LDO Output Accuracy in Adjustable Mode
BYP = GND, 5.5V < V
IN
< 25V, LDOREFIN < 0.3V,
0 < ILDO < 100mA
BYP = GND, 5.5V < V
IN
< 25V, LDOREFIN > (VCC -1V),
0 < ILDO < 100mA
V
IN
= 5.5V to 25V, V
LDO
= 2 x V
LDOREFIN
V
IN
= 5.5V to 25V, V
LDOREFIN
= 0.35V to 0.5V
V
IN
= 5.5V to 25V, V
LDOREFIN
= 0.5V to 2.25V
LDOREFIN Input Range
LDO Output Current
LDO Output Current During Switchover
LDO Output Current During Switchover
to 3.3V
LDO Short-Circuit Current
V
LDO
= 2 x V
LDOREFIN
BYP = GND, V
IN
= 5.5V to 25V (Note 5)
BYP = 5V, V
IN
= 5.5V to 25V, LDOREFIN < 0.3V
BYP = 3.3V, V
IN
= 5.5V to 25V, LDOREFIN > (VCC - 1V)
LDO = GND, BYP = GND
200
0.35
4.925
3.250
0.7
5.000
3.300
5.075
3.350
4.5
±2.5
±1.5
2.25
100
200
100
400
V
V
V
%
%
V
mA
mA
mA
mA
FN6373 Rev 6.00
April 29, 2010
Page 4 of 36
ISL6236
Electrical Specifications
No load on LDO, OUT1, OUT2, V
REF3
, and REF, V
IN
= 12V, EN2 = EN1 = VCC, VBYP = 5V, PVCC = 5V,
VEN_LDO = 5V, T
A
= -40°C to +100°C, unless otherwise noted. Typical values are at T
A
= +25°C.
Boldface
limits apply over the operating temperature range, -40°C to +85°C. (Continued)
CONDITIONS
Rising edge of PVCC
Falling edge of PVCC
LDO 5V Bootstrap Switch Threshold to BYP Rising edge at BYP regulation point
LDOREFIN = GND
LDO 3.3V Bootstrap Switch Threshold to
BYP
LDO 5V Bootstrap Switch Equivalent
Resistance
LDO 3.3V Bootstrap Switch Equivalent
Resistance
VREF3 Output Voltage
Rising edge at BYP regulation point
LDOREFIN = VCC
LDO to BYP, BYP = 5V, LDOREFIN > (VCC -1V) (Note 5)
LDO to BYP, BYP = 3.3V, LDOREFIN < 0.3V (Note 5)
No external load, VCC > 4.5V
No external load, VCC < 4.0V
VREF3 Load Regulation
VREF3 Current Limit
REF Output Voltage
REF Load Regulation
REF Sink Current
VIN Operating Supply Current
VIN Standby Supply Current
VIN Shutdown Supply Current
Quiescent Power Consumption
FAULT DETECTION
Overvoltage Trip Threshold
FB1 with respect to nominal regulation point
REFIN2 with respect to nominal regulation point
Overvoltage Fault Propagation Delay
POK Threshold
POK Propagation Delay
POK Output Low Voltage
POK Leakage Current
Thermal-Shutdown Threshold
Out-Of-Bound Threshold
Output Undervoltage Shutdown Threshold
Output Undervoltage Shutdown Blanking
Time
INPUTS AND OUTPUTS
FB1 Input Voltage
Low level
High level
REFIN2 Input Voltage
OUT2 Dynamic Range, V
OUT2
= V
REFIN2
Fixed OUT2 = 1.05V
Fixed OUT2 = 3.3V
VCC - 1.0
0.5
3.0
VCC - 1.0
2.50
VCC - 1.1
0.3
V
V
V
V
V
FB1 or REFIN2 with respect to nominal output voltage
FB1 or REFIN2 with respect to nominal output voltage
From EN signal
65
10
FB1 or REFIN2 delay with 50mV overdrive
FB1 or REFIN2 with respect to nominal output, falling
edge, typical hysteresis = 1%
Falling edge, 50mV overdrive
I
SINK
= 4mA
High state, forced to 5.5V
+150
5
70
20
75
30
-12
+8
+12
+11
+16
10
-9
10
0.2
1
-6
+14
+20
%
%
µs
%
µs
V
µA
°C
%
%
ms
0 < I
LOAD
< 5mA
VREF3 = GND
No external load
0 < I
LOAD
< 50µA
REF in regulation
Both SMPSs on, FB1 = SKIP = GND, REFIN2 = VCC
V
OUT1
= BYP = 5.3V, V
OUT2
= 3.5V
V
IN
= 5.5V to 25V, both SMPSs off, EN LDO = VCC
V
IN
= 4.5V to 25V, EN1 = EN2 = EN LDO = 0V
Both SMPSs on, FB1 = SKIP = GND, REFIN2 = VCC,
V
OUT1
= BYP = 5.3V, V
OUT2
= 3.5V
10
25
180
20
5
50
250
30
7
1.980
3.235
3.220
3.9
4.53
3.0
MIN
(Note 6)
TYP
4.35
4.05
4.68
3.1
0.7
1.5
3.300
3.300
10
10
2.000
10
17
2.020
4.83
3.2
1.5
3.0
3.365
3.380
V
V
V
V
mV
mA
V
mV
µA
µA
µA
µA
mW
MAX
(Note 6)
4.5
UNITS
V
PARAMETER
Undervoltage-Lockout Fault Threshold
FN6373 Rev 6.00
April 29, 2010
Page 5 of 36
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