Programmable Synchronous DC/DC Hysteretic Controller - Semtech Corporation
Description
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Programmable Synchronous DC/DC Hysteretic Controller with VRM 8.
5 VID Range
POWER MANAGEMENT Description
The SC1159 is a synchronous-buck switch-mode controller designed for use in single ended power supply applications where efficiency is the primary concern.
The controller is a hysteretic type, with a user selectable hysteresis.
The SC1159 is ideal for implementing DC/DC converters needed to power advanced microprocessors such as Pentium® llI and Athlon®, in both single and multiple processor configurations.
Inhibit, under-voltage lockout and soft-start functions are included for controlled power-up.
SC1159 features include an integrated 5 bit D/A converter, temperature compensated voltage reference, current limit comparator, over-current protection, and an adaptive deadtime circuit to prevent shoot-through of the power MOSFET during switching transitions.
Power good signaling, logic compatible shutdown, and over-voltage protection are also provided.
The integrated D/A converter provides programmability of output voltage from 1.
050V to 1.
825V in 25mV increments.
The SC1159 high side driver can be configured as either a ground-referenced or as a floating bootstrap driver.
The high and low side MOSFET drivers have a peak current rating of 2 amps.
SC1159
Features
Programmable hysteresis 5 bit DAC programmable output (1.
050V-1.
825V) On-chip power good and OVP functions Designed to meet latest Intel specifications Up to 95% efficiency +1% tolerance over temperature
Applications
Server Systems and Workstations Pentium® III Core Supplies AMD Athlon® Core Supplies Multiple Microprocessor Supplies Voltage Regulator Modules
Typical Application Circuit
+5V R1 * R3 * R2 1k 2 R4 1k DROOP VID0 27 U1 SC1159CSW 1 IOUT PWRGD 28 C6 0.
1 INHIB 3 OCP VID1 26 R11 1k C7 0.
1 R9 10k R10 1k PWRGD
"POWER GOOD"
"INHIBIT"
4 R5 * C1 0.
1 C2 0.
001
VHYST
VID2
25
5
VREFB
VID3
24
L1 0.
5uH
R6 20k
6
VSENSE
VID25
23 Cin HF Cin Bulk
+
Vin ...
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