SC2688 Controller Datasheet

SC2688 Datasheet PDF, Equivalent


Part Number

SC2688

Description

Dual LDO Controller

Manufacture

Semtech

Total Page 12 Pages
Datasheet
Download SC2688 Datasheet


SC2688
SC2688
Programmable Synchronous DC/DC
Converter, Dual LDO Controller
POWER MANAGEMENT
Description
Features
The SC2688 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® III.
‹ ·Synchronous design, enables no heatsink solution
‹ 95% efficiency (switching section)
‹ Designed for embedded Pentium® III requirements
‹ 1.5V, 2.5V short circuit protected linear controllers
The SC2688 switching section features latched drive out-
put for enhanced noise immunity, pulse by pulse current
limiting and logic compatible shutdown. The SC2688
switching section operates at a fixed frequency of 140kHz,
providing an optimum compromise between size, efficiency
and cost in the intended application areas.
Applications
‹ Embedded Pentium® III microprocessor supplies.
The SC2688 linear sections are low dropout regulators
with short circuit protection, supplying 1.5V for GTL bus
and 2.5V for non-GTL I/O.
Typical Application Circuit
12V
5V
+
1500uF
x4
10
0.1uF
EN
3.3V
11 BST
4 VCC
5 LDOEN
12 EN
16 AGND
14 LDOV
15 GATE2
3 LDOS2
SC2688S
CS+ 7
CS- 6
DH 8
DL 10
FB 13
PGND 9
GATE1 1
LDOS1 2
0.1uF
2R2
2R2
330uF
+
1.5V
+
330uF
2.5V
+
330uF
+
47uF
0.1uF
0.1uF
1.00k
2.32k
1.9uH
5mOhm
VCC_CORE
+ 0.1uF
1500uF
x6
1k
Revision: March 25, 2004
1
www.semtech.com

SC2688
SC2688
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.
Parameter
Symbol
Maximum
Units
VCC to AGND
PGND to AGND
VIN -0.3 to +7
±1
V
V
BST to PGND
-0.3 to +15
V
DH to PGND, DL to PGND (Note2)
-1 to +15
V
Operating Temperature Range
TA 0 to +70 °C
Junction Temperature Range
TJ 0 to +125 °C
Storage Temperature Range
TSTG -65 to +150
°C
Lead Temperature (Soldering) 10 Sec.
TLEAD
300
°C
Thermal Resistance Junction to Ambient
θJA
80 °C/W
Thermal Impedance Junction to Case
θJC 25 °C/W
Electrical Characteristics
Unless specified: VCC = 4.75V to 5.25V; GND = PGND = 0V; VOSENSE = VO; 0mV < (CS+-CS-) < 60mV; LDOV = BST = 11.4V to 12.6V; TA = 0 to 70°C
Parameter
Conditions
Min
Typ
Max
Units
Switching Section
Output Voltage
Supply Voltage
IO = 2A in Application Circuit
VCC
1.238
4.5
1.250
1.263
7
V
V
Supply Current
VCC = 5.0V
8 15 mA
Load Regulation
Line Regulation
IO = 0.8A to 15A
1
±0.5
%
%
Current Limit Voltage
60 70
85 mV
Oscillator Frequency
120 140 160 kHz
Oscillator Max Duty Cycle
90 95
%
Peak DH Sink/Source Current BSTH - DH = 4.5V, DH- PGNDH = 3.3V
DH- PGNDH = 1.5V
1
100
A
mA
Peak DL Sink/Source Current BSTL - DL = 4.5V, DL - PGNDL= 3.3V
DL- PGNDH = 1.5V
1
100
A
mA
Gain (AOL)
FB Input current
Dead Time
VOSENSE to VO
VFB = 1.25V
35 dB
1 2 uA
40 100
ns
2004 Semtech Corp.
2
www.semtech.com


Features SC2688 Programmable Synchronous DC/DC Co nverter, Dual LDO Controller POWER MAN AGEMENT Description Features The SC26 88 combines a synchronous voltage mode controller with two low-dropout linear regulators providing most of the circui try necessary to implement three DC/DC converters for powering advanced microp rocessors such as Pentium® III. ‹ · Synchronous design, enables no heatsink solution ‹ 95% efficiency (switching section) ‹ Designed for embedded Penti um® III requirements ‹ 1.5V, 2.5V sho rt circuit protected linear controllers The SC2688 switching section features latched drive output for enhanced nois e immunity, pulse by pulse current limi ting and logic compatible shutdown. The SC2688 switching section operates at a fixed frequency of 140kHz, providing a n optimum compromise between size, effi ciency and cost in the intended applica tion areas. Applications ‹ Embedded P entium® III microprocessor supplies. The SC2688 linear sections are low dropout regulators with short circuit.
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