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Linear Technology Electronic Components Datasheet

LTC1553L Datasheet

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor

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LTC1553L pdf
LTC1553L
5-Bit Programmable
Synchronous Switching
Regulator Controller for
Pentium® II Processor
FEATURES
s 5-Bit Digitally Programmable 1.8V to 3.5V Fixed
Output Voltage
s Provides All Features Required by the Intel
Pentium® II Processor VRM 8.2 DC/DC
Converter Specification
s Flags for Power Good, Over-Temperature and
Overvoltage Fault
s 19A Output Current Capability from a 5V Supply
s Dual N-Channel MOSFET Synchronous Driver
s Initial Output Accuracy: ±1.5%
s Excellent Output Accuracy: ±2% Typ Over Line,
Load and Temperature Variations
s High Efficiency: Over 95% Possible
s Adjustable Current Limit Without External Sense
Resistors
s Fast Transient Response
s Available in 2O-Lead SSOP and SW Packages
U
APPLICATIONS
s Power Supply for Pentium II, SPARC, ALPHA and
PA-RISC Microprocessors
s High Power 5V to 1.8V-3.5V Regulators
DESCRIPTION
The LTC®1553L is a high power, high efficiency switching
regulator controller optimized for a 5V input to 1.8V-3.5V
output applications. It features a digitally programmable
output voltage, a precision internal reference and an internal
feedback system that provides output accuracy of ±1.5% at
room temperature and typically ±2% over-temperature, load
current and line voltage shifts. The LTC1553L uses a syn-
chronous switching architecture with two external N-channel
output devices, providing high efficiency and eliminating the
need for a high power, high cost P-channel device. Addition-
ally, it senses the output current across the on-resistance of
the upper N-channel FET, providing an adjustable current
limit without an external low value sense resistor.
The LTC1553L free-runs at 300kHz and can be synchronized
to a faster external clock if desired. It includes all the inputs
and outputs required to implement a power supply conform-
ing to the Intel Pentium® II Processor VRM 8.2 DC/DC
Converter Specification.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Pentium is a registered trademark of Intel Corporation.
TYPICAL APPLICATION
PVCC
12V
VIN
5V
PENTIUM® II
SYSTEM
5.6k 5.6k 5.6k
+
0.1µF
10µF
2.7k
0.1µF
+
10µF
+ CIN**
1200µF
×4
5
C1
150pF
RC
8.2k
CC
0.01µF
PWRGD
VCC IMAX
FAULT
OT
VID0 TO VID4
LTC1553L
OUTEN
COMP SS SGND GND
CSS
0.1µF
PVCC
G1
IFB
SENSE
G2
0.1µF
Q1*
LO
2µH
2018A
+COUT††
Q2* 330µF
×7
*SILICONIX SUD50N03-10
**SANYO 10MV1200GX
COILTRONICS CTX02-13198 OR
PANASONIC 12TS-2R5SP
††AVX TPSE337M006R0100
Figure 1. 5V to 1.8V-3.5V Supply Application
VOUT
1.8V TO
3.5V
14A
1553L F01
1


Linear Technology Electronic Components Datasheet

LTC1553L Datasheet

5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor

No Preview Available !

LTC1553L pdf
LTC1553L
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltage
VCC ........................................................................ 7V
PVCC ................................................................... 14V
Input Voltage
IFB (Note 2) ............................................ PVCC + 0.3V
IMAX ........................................................ – 0.3V to 9V
All Other Inputs ......................... – 0.3V to VCC + 0.3V
Digital Output Voltage ................................. – 0.3V to 9V
IFB Input Current (Notes 2, 3) .......................... – 100mA
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec.)................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
G2 1
PVCC 2
GND 3
SGND 4
VCC 5
SENSE 6
IMAX
IFB
SS
7
8
9
COMP 10
20 G1
19 OUTEN
18 VID0
17 VID1
16 VID2
15 VID3
14 VID4
13 PWRGD
12 FAULT
11 OT
ORDER PART
NUMBER
LTC1553LCG
LTC1553LCSW
G PACKAGE
SW PACKAGE
20-LEAD PLASTIC SSOP 20-LEAD PLASTIC SO
TJMAX = 125°C, θJA = 100°C/ W (G)
TJMAX = 125°C, θJA = 100°C/ W (SW)
Consult factory for Industrial and Military grade parts.
ELECTRICAL CHARACTERISTICS VCC = 5V, PVCC = 12V, TA = 25°C, unless otherwise noted. (Note 3)
SYMBOL
VCC
PVCC
VFB
VOUT
VOUT
VPWRGD
VFAULT
ICC
IPVCC
PARAMETER
Supply Voltage
Supply Voltage for G1, G2
Internal Feedback Voltage
1.8V Initial Output Voltage
2.8V Initial Output Voltage
3.5V Initial Output Voltage
1.8V Initial Output Voltage
2.8V Initial Output Voltage
3.5V Initial Output Voltage
Output Load Regulation
Output Line Regulation
Positive Power Good Trip Point
Negative Power Good Trip Point
FAULT Trip Point
Operating Supply Current
Shutdown Supply Current
Supply Current
fOSC
VSAWL
VSAWH
GERR
gmERR
BWERR
Internal Oscillator Frequency
VCOMP at Minimum Duty Cycle
VCOMP at Maximum Duty Cycle
Error Amplifier Open-Loop DC Gain
Error Amplifier Transconductance
Error Amplifier –3dB Bandwidth
CONDITIONS
(Note 4)
With Respect to Rated Output Voltage (Figure 2)
IOUT = 0 to 14A (Note 4) (Figure 2)
VIN = 4.75V to 5.25V, IOUT = 0 (Note 4)(Figure 2)
% Above Output Voltage (Figure 2)
% Below Output Voltage (Figure 2)
% Above Output Voltage (Figure 2)
OUTEN = VCC = 5V (Note 5)(Figure 3)
OUTEN = 0, VID0 to VID4 Floating (Figure 3)
PVCC = 12V, OUTEN = VCC (Note 6) (Figure 3)
PVCC = 12V, OUTEN = 0, VID0 to VID4 Floating
(Figure 4)
(Note 4)
(Note 4)
(Note 7)
(Note 7)
COMP = Open (Note 4)
MIN TYP
q 4.5
q
1.260
– 27 (– 1.5%)
– 42 (– 1.5%)
– 52 (– 1.5%)
q – 36 (– 2%)
q – 56 (– 2%)
q – 70 (– 2%)
–5
±1
q5
q –7 –5
q 12 15
q 800
q 130
15
1
q 250 300
1.8
2.8
q 40 53
q 0.9 1.6
400
MAX UNITS
6V
13.2 V
V
27 (+ 1.5%)
42 (+ 1.5%)
52 (+ 1.5%)
36 (+ 2%)
56 (+ 2%)
70 (+ 2%)
mV
mV
mV
mV
mV
mV
mV
mV
7%
%
20 %
1200 µA
250 µA
mA
µA
350 kHz
V
V
dB
2.3 millimho
kHz
2


Part Number LTC1553L
Description 5-Bit Programmable Synchronous Switching Regulator Controller for Pentium II Processor
Maker Linear Technology
Total Page 20 Pages
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