SC1186_04 SEMTECH [Semtech Corporation], SC1186_04 Datasheet

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SC1186_04

Manufacturer Part Number
SC1186_04
Description
Programmable Synchronous DC/DC Converter, Dual LDO Controller
Manufacturer
SEMTECH [Semtech Corporation]
Datasheet
Revision: December 2, 2004
The SC1186 combines a synchronous voltage mode
controller with two low-dropout linear regulators
providing most of the circuitry necessary to implement three
DC/DC converters for powering advanced microprocessors
such as Pentium
The SC1186 switching section features an integrated 5
bit D/A converter, latched drive output for enhanced noise
immunity, pulse by pulse current limiting and logic
compatible shutdown. The SC1186 switching section
operates at a fixed frequency of 140kHz, providing an op-
timum compromise between size, efficiency and cost in
the intended application areas. The integrated D/A con-
verter provides programmability of output voltage from 2.0V
to 3.5V in 100mV increments and 1.30V to 2.05V in
50mV increments with no external components.
The SC1186 linear sections are low dropout regulators
with short circuit protection, supplying 1.5V for GTL bus
and 2.5V for non-GTL I/O. The Reference voltage is made
available for external linear regulators.
POWER MANAGEMENT
Description
Typical Application Circuit
330uF
®
12V
VID4
5V
1500uF
x4
VID0
VID1
VID2
VID3
EN
3.3V
II & III.
+
+
0.1uF
IRLR024N
10
330uF
22
21
20
19
18
16
23
24
+
5
7
1
4
1.5V
SC1186CS
VCC
LDOEN
VID0
VID1
VID2
VID3
VID4
EN
AGND
LDOV
GATE2
LDOS2
VOSENSE
PGNDH
PGNDL
GATE1
LDOS1
BSTH
BSTL
CS+
REF
CS-
2.5V
DH
DL
330uF
9
8
17
15
11
14
13
10
12
6
2
3
+
0.1uF
1
IRLR024N
Features
2R2
2R2
Applications
IRLR3103N
IRLR3103N
Programmable Synchronous DC/DC
Synchronous design, enables no heatsink solution
95% efficiency (switching section)
5 bit DAC for output programmability
Designed for Intel Pentium
1.5V, 2.5V short circuit protected linear controllers
1.265V ± 1.5% Reference available
Pentium
Flexible motherboards
1.3V to 3.5V microprocessor supplies
Programmable triple power supplies
0.1uF
Converter, Dual LDO Controller
®
3
2
ll & III microprocessor supplies
8
1.9uH
12V
4
+
-
LM358
47uF
1k
1
1.00k
330uF
+
0.1uF
3.3V
5mOhm
+
IRLR024N
VLIN3
®
2.32k
1500uF
ll & III requirements
x6
+
VCC_CORE
www.semtech.com
SC1186
0.1uF

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SC1186_04 Summary of contents

Page 1

POWER MANAGEMENT Description The SC1186 combines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circuitry necessary to implement three DC/DC converters for powering advanced microprocessors such as Pentium II & III. ® The SC1186 ...

Page 2

POWER MANAGEMENT Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions ...

Page 3

POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = ...

Page 4

POWER MANAGEMENT Pin Configuration TOP VIEW AGND 1 24 GATE1 2 23 LDOS1 3 22 LDOS2 4 21 VCC 5 20 REF 6 19 LDOEN PGNDH PGNDL ...

Page 5

POWER MANAGEMENT Block Diagram REF VID4 VID3 D/A VID2 VID1 VID0 VOSENSE AGND LDOEN LDOS1 2.5V FET CONTROLLER GATE1 2004 Semtech Corp. VCC CS- CS+ EN CURRENT LIMIT 70mV + - + - - + ERROR AMP R Q OSCILLATOR ...

Page 6

POWER MANAGEMENT Applications Information - Output Voltage Table Unless specified: 4.75V < VCC < 5.25V; GND = PGND = 0V; VOSENSE = ...

Page 7

POWER MANAGEMENT Layout Guidelines Careful attention to layout requirements are necessary for successful implementation of the SC1186 PWM control- ler. High currents switching at 140kHz are present in the application and their effect on ground plane voltage differ- entials must ...

Page 8

POWER MANAGEMENT Layout Guidelines (Cont.) 4) The Output Capacitor(s) (Cout) should be located as close to the load as possible, fast transient load currents are supplied by Cout only, and connections between Cout and the load must be short, wide ...

Page 9

POWER MANAGEMENT Component Selection SWITCHING SECTION OUTPUT CAPACITORS - Selection begins with the most critical component. Because of fast transient load current requirements in modern microprocessor core supplies, the output capacitors must supply all transient load current requirements until the ...

Page 10

POWER MANAGEMENT Component Selection (Cont first order approximation convenient to only consider conduction losses to determine FET suitability. For a 5V in; 2.8V out at 14.2A requirement, typical FET losses would be: Using 1.5X Room temp ...

Page 11

POWER MANAGEMENT Theory of Operation (Linear OCP) The Linear controllers in the SC1186 have built in Overcurrent Protection (OCP). An overcurrent is assumed to have occured when the external FET is turned fully on and the output currrent is R ...

Page 12

POWER MANAGEMENT Typical Characteristics Typical Efficiency (Switching section) 96% PIN Descriptions 92% 88% 84% Vo=2.8V 80% Vo=2.0V Vo=2.5V 76% 0.0 2.0 4.0 6.0 8.0 Io (Amps) Transient Response Vo=2.4V, Io=300mA to 15A 2004 Semtech Corp. 10.0 12.0 14.0 16.0 2.5V ...

Page 13

POWER MANAGEMENT Evaluation Board Schematic 2004 Semtech Corp. 13 SC1186 www.semtech.com ...

Page 14

POWER MANAGEMENT Evaluation Board Bill of Materials ...

Page 15

POWER MANAGEMENT Outline Drawing - SO- E/2 R ccc N/2 TIPS aaa C SEATING PLANE C J NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- 3. DIMENSIONS "E1" AND "D" ...

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