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PDF SC1406A Data sheet ( Hoja de datos )
| Número de pieza | SC1406A | |
| Descripción | PORTABLE PENTIUM II & III POWER SUPPLY CONTROLLER | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SC1406A (archivo pdf) en la parte inferior de esta página. Total 17 Páginas | ||
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PORTABLE PENTIUM® II & III
POWER SUPPLY CONTROLLER
SC1406A
January 28, 2000
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC1406A is a High Speed, High performance
Hysteretic Mode controller. It is part of a two chip solu-
tion, with the SC1405 Smart Driver, providing power
to advanced micro-processors. It uses a Dynamic Set
Point switching technique along with an ultra-fast com-
parator to provide the control signal to an external
high speed Mosfet driver. A 5-bit DAC sets the output
voltage, thus providing a voltage resolution of 25mV.
SC1406A has two on-chip linear regulators which
drive external PNP transistors with output voltage set-
tings of 1.5V and 2.5Vdc. The linear regulator drivers
have a separate soft start. A PWRGD TTL level signal
is asserted when all voltages are within specifications.
The part features Low Battery Detect and Undervolt-
age Lock-Out for the main Hysteretic controller to as-
sure V-DC is within acceptable limits. An Over-Current
comparator disables the main controller during an
overcurrent condition using an externally pro-
grammable threshold.
FEATURES
• High Speed Hysteretic controller provides high
efficiency over a wide operating load range
• Inherently stable
• Complete power solution with two LDO drivers
• Programmable output voltage for Pentium® II & III
Processors
APPLICATIONS
• Laptop and Notebook computers
• High performance Microprocessor based systems
• High efficiency distributed power supplies
ORDERING INFORMATION
DEVICE
SC1406ACTS
PACKAGE
TSSOP-28
BLOCK DIAGRAM
TEMP. (TJ)
0 - 125°C
PIN CONFIGURATION
Top View
TSSOP-28
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
1
652 MITCHELL ROAD NEWBURY PARK CA 91320
1 page  
PORTABLE PENTIUM® II & III
POWER SUPPLY CONTROLLER
SC1406A
January 28, 2000
ELECTRICAL CHARACTERISTICS (CONT.)
Unless specified: -0 < TA < 100°C; VCC = 3.3V (See test circuit)
PARAMETER
SYMBOL
CONDITIONS
CORE CONVERTER CONTROLLER
Core Converter Soft Start Current
MIN TYP MAX UNITS
Core Converter Soft Start Current ISSCORE
Charge (Source) current
Discharge (Sink) current
0.6 1 1.45 µA
0.30 1
mA
VSSCORE Soft Start Termination
Threshold
VSSCORE Discharge Threshold
VID DAC
VSSTERM
VSSDIS
1.53 1.70 1.87 V
150 400 mV
VID Input Threshold
VVID_IH
3.0V < VCC < 3.6V
0.7*VCC
VVID_IL
VID Input-Pull-up Current,VID (0-4)
IVID
VID (0-4) = 00000...11111
6
Output Voltage Accuracy
VDAC_ERR IDAC = 0, VID(0-4) = 00000...11111 -0.85
Settling Time*
tpdVID_DAC
CDAC = 1000pF
VID is set to change VCORE from
1.30V to 1.45V or 1.45V to 1.30V
CORE Comparator (CMP, CMPREF, HYS, CO)
0.8
40
+0.85
35
V
µA
%
µs
Input Bias Current
Input Offset Voltage
Hysteresis Setting Current
Output Voltage
Propagation Delay Time**
Measured at device pins, from the
trip point to 50% of CO transition.
Output Rise/Fall Times**
Measured between 30% and 70%
points of CO transition
IBCMP
VCPM-
VCPMREF
ICMPREF
VHCO
CMP<CMPREF
VLCO
CMP>CMPREF
Tpd CMP-CO
TR
TF
VCMP = VCMPREF = 1.3V
VCMPREF = 1.3V
RHYS = open
RHYS = 17kΩ
RHYS = 170kΩ
Load Impedance = 100k in
parallel with 10pF, VCC = 3.0V
Load Impedance = 100k in
parallel with 10pF, VCC = 3.6V
VCMPREF = 1.3V ∆ VCMP = +40mV
step with +20mV, overdrive
TA = 25°C,
TA = full range
VCMPREF = 1.3V ∆ VCMP = 40mV
step with 20mV overdrive,
TA = 25°C,
TA = full range
CCO = 10pF
VCC = 3.0V
RCO = 100K
±2
±1.5 ±3
µA
mV
+2
±85 +100 +115
±7 +10 +13
2.5
µA
V
0.4 V
20 ns
30
20
30
7 10
7 10
ns
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
5
652 MITCHELL ROAD NEWBURY PARK CA 91320
5 Page 
PORTABLE PENTIUM® II & III
POWER SUPPLY CONTROLLER
SC1406A
January 28, 2000
Core Converter Soft Start Timer
The main purpose of this block is to control the ramp-
up time of the core voltage in order to reduce the ini-
tial inrush current on the core input voltage (battery)
rail. The soft start circuit consists of an internal cur-
rent source, external soft start timing capacitor, inter-
nal switch across the capacitor, and a comparator
monitoring the capacitor voltage.
LINEAR REGULATOR CONTROLLER
1.5V Linear Regulator
This block is a linear regulator controller, which drives
an external PNP bipolar transistor as a pass element.
The linear regulator is capable of delivering 500mA
steady state DC current and should support transient
current of 1A, assuming the output filtering capacitor
is properly selected to provide enough charge for the
duration of the load transient.
2.5V Linear Regulator
This block is a low drop-out (LDO) linear regulator
controller, which drives an external PNP bipolar tran-
sistor as a pass element. The LDO linear regulator is
capable of delivering 100mA steady DC current and
should support transient current of 100mA, assuming
the output filtering capacitor is properly selected to
provide enough charge for the duration of the load
transient.
Linear Regulator Soft Start Timer
A soft start timer circuit of the linear regulators is simi-
lar to that of the core converter, and is used to control
the ramp up time of the linear regulator output volt-
ages. For maximum flexibility in controlling the start
up sequence, the soft start function of the linear regu-
lators is separated from that of the core converter.
VOLTAGE CLAMP
The level translator converts an input voltage swing
on the IO rail, into a voltage swing on the CLK or VCC
rail depending on where the open drain output of the
translator is tied to through an external pull-up resistor.
The level translator has to track the input in phase,
and must be able to switch in 5ns (typical) following an
input threshold intercept.
APPLICATION INFORMATION
Power on/off Sequence
See Application note AN99-12 for further information.
© 2000 SEMTECH CORP.
Pentium is a registered trademark of Intel Corporation
11
652 MITCHELL ROAD NEWBURY PARK CA 91320
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet SC1406A.PDF ] | |
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