SC1406G Datasheet PDF - Semtech Corporation
| Part Number | SC1406G | |
| Description | Power Supply Controller for Portable Pentium II & III SpeedStep Processors | |
| Manufacturers | Semtech Corporation | |
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There is a preview and SC1406G download ( pdf file ) link at the bottom of this page. Total 28 Pages | ||
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SC1406G
Power Supply Controller for Portable
Pentium ® II & III SpeedStep Processors
POWER MANAGEMENT
Description
Features
The SC1406G PowerStep controller is a High Speed,
High Performance Hysteretic Mode PWM controller.
Teamed with the SC1405 Smart Driver, it powers ad-
vanced Pentium® II and Pentium® III processors. The
SC1406G features Intel Mobile Voltage Positioning
(IMVP), which increases battery life by reducing the volt-
age at the processor when it is heavily loaded. It also
directly supports Intels SpeedStep processors for even
longer battery life.
A 5-bit DAC, accurate to 0.85%, sets the output voltage
reference, and implements the 0.925V to 2.00V range
of the mobile Pentium® specifications. The hysteretic
converter uses a comparator without an error amplifier,
and therefore provides the fastest possible transient
response, while avoiding the stability issues inherent to
classical PWM controllers.
u High-speed hysteretic controller provides high effi
ciency over a wide operating load range
u Inherently stable
u Complete CPU power solution with two LDO drivers
u Programmable core voltage for Pentium® II & III pro
cessors
u Native Speed Step® support
Applications
u Laptop and notebook computers
u High performance microprocessor-based systems
u High efficiency distributed power supplies
Two linear regulator controllers, coupled with appropri-
ate external transistors, produce tightly regulated 1.5V
and 2.5V to complete the processor power solution.
The SC1406G also features separate soft-start con-
trols for the converter and the regulators, a TTL-
compatible power good indication, logic enable, and
low battery undervoltage lockout. Programmable
current limiting uses a separate comparator to protect
against overloads and short-circuits.
Conceptual Application Circuit
+V_5
VVIIDD [[44::00]]
PW M
Controller
SSCC11440066GG
IMIMVVPP
CCOONNTTRROOLLLLEERR
LDO
Controller
LDO
Controller
SSCC11440055
SSmmaartrt
MMOOSSFFEETT
DDrirviveerr
3.3V
3.3V
+V_IN
Lo ++VVCCCC__CCPPUU__CCOORREE
Co
0.925V-2.0V
Up to 14A
1.5V
2.5A
++VVCCCC__CCPPUU__IIOO
2.5V
150mA
++VVCCCC__CCPPUU__CCLLKK
Revision 8/3/2000 1 www.semtech.com
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SC1406G
POWER MANAGEMENT
Electrical Characteristics Continued
Unless specified: -0 < TA < 100°C; VCC = 3.3V (See test circuit)
PARAMETER
Input Bias Current
Output Voltage, VFB15
CO_1.5 = 56µF, 20mW ESR max
or 150µF, 45mW ESR max
Capacitance tolerance = 20%
Base Drive Output Current
SYMBOL
CONDITIONS
1.5V Linear Regulator Controller
VFB15 = 1.5V
External pnp BJT with BMIN > 50 @
IC = 500mA
IO = 0mA to 500mA
TA = 25°C
MIN TYP MAX UNITS
1
1.47 1.50 1.54
mA
V
10 120 mA
2.5V Linear Regulator Controller
Input Bias Current
Output Voltage, VFB15
CO_1.5 = 56µF, 20mW ESR max
or 150µF, 45mW ESR max
Capacitance tolerance = 20%
Base Drive Output Current
VFB15 = 2.5V
External pnp BJT with BMIN > 50 @
IC = 100mA
IO = 0mA to 100mA
TA = 25°C
Linear Regulator Soft Start (LRSS)
2.45
2.50
1
2.55
mA
V
2.5 20 mA
Linear Reg Soft Start Current
Enable Threshold
Soft-Start Termination Threshold
ILRSS Charge Current = VLRSS = 0V
Discharge Current, VLRSS = 1.50V,
EN is low or the battery is in UVLO
-0.6 -1 -1.45 µA
0.3 1
mA
1.53
150
1.70
400
1.87
mA
V
Voltage Clamp (VCIN, VCOUT, VCBYP) (Note: This circuit section is rarely used).
Input Voltage
0.93 1.5 1.60
V
Output Voltage
Progagation Delay**
* Guaranteed by design.
**Guaranteed by characterization.
RVCOUT = 150W
tied to VS = 2.5V
IVCIN = -10µA
VCIN is Open
VVCIN = 0.175V
RVCOUT = 150W tied to VS = 2.5V
CVCBYP = 1500pF, VCIN steps from
0.175V to 1.50V and back.
Measured from 50% of VCIN step to
50% of VCOUT transient
0.8Vs
Vs
0.375
10
V
nS
ã 2000 Semtech Corp.
5
www.semtech.com
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for SC1406G electronic component. |
| Information | Total 28 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ SC1406G.PDF Datasheet ] | |
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