SC2659中文资料

IBOOTq
INH = OV or Vin below UVLO threshold during start-up, BOOT = 13V, BOOTLO = 0V
2
mA
INH = 5V, VIN above UVLO threshold
5
mA
during start-up,
fsw = 200kHz, BOOT = 13V, BOOTLO = 0V, CDH = 50pF
PD
1.2
W
Continuous Power Dissipation, TC = 25 0C
PD
6.25
W
Operating Junction Temperature Range
TJ
0 to +125
°C
Lead Temperature (Soldering) 10 Sec.
TL
300
°C
Storage Temperature
-0.3 to 14
V
LOSENSE to AGND
-0.3 to 14
V
IOTLO to AGND
-0.3 to 14
V
HISENSE to AGND
-0.3 to 14
V
VSENSE to AGND
-0.3 to 5
V
Continuous Power Dissipation, TA = 25 0C
Parameter
Symbol
Maximum
Units
VIN12V BOOT to DRVGND
VINMAX
-0.3 to 14
V
-0.3 to 25
V
BOOT to BOOTLO
-0.3 to 15
V
Digital Inputs
-0.3 to 7.3
V
AGND to DRVGND
±0.5
V
LOHIB to AGND
Applications
Server Systems and Workstations Pentium® III Core Supplies AMD Athlon® Core Supplies Multiple Microprocessor Supplies Voltage Regulator Modules
TSTG
-65 to 150
°C
DC Electrical Characteristics
Unless specified: 0 < TJ < 125°C, VIN = 12V
Parameter
Symbol
Conditions
Min Typ Max Units
Supply Voltage Range
Typical Application Circuit
+5V
R2 1k
R4 1k
R1
*
U1
SC2659 R3
*
1 IOUT
2 DROOP
3 OCP
R5 *
R6 20k
C2 0.001
4 VHYST
5 VREFB C1 0.1
6 VSENSE
7 AGND
C3 0.1 +5V
C4 0.01
8 SOFTST 9 N/C 10 LODRV 11 LOHIB
VDROOP ACC VDROOP = 50 mV
OCP Trip Point Input Bias Current High-Side VDS Sensing
12 DRVGND
13 LOWDR
14 DRV
C5
R9 10k
PWRGD
28
VID0 27
VID1 26
VID2 25
R10 1k
R11 1k
PWRGD "POWER GOOD"
C6 0.1
INHIB "INHIBIT"
C7 0.1
VID3 24 VID25 23 INHIBIT 22
L1 0.5uH
The SC2659 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.
Vstart(NH)
VstartUVLO VhysUVLO
VosHYSCMP IbiasHYSCMP
VHYS ACC VHYS SET
VDROOP pin grounded
1 2.0 2.4
V
9.25 10.25 11.25 V
1.8 2.1 2.4
V
5
mV
1
uA
7
mV
60 mV
2003 Semtech Corp.
元器件交易网
SC2659
Programmable Synchronous DC/DC Hysteretic Controller with VRM 8.5 VID Range
POWER MANAGEMENT Description
Features
The SC2659 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 SC2659 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.
Cout HF
+ Vin +5V/12V
_
+ 1.05 to 1.825V
_
R7
R8 * 10k
*) for the values see specific application circuit somewhere else in the datasheet
Revision: December 10, 2003
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SC2659
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.
VIN12V
11.4 12
13
V
Supply Current (Quiescent)
IINq INH = 5V, Vin above UVLO threshold during
15
mA
start-up,
fsw = 200 kHz, BOOTLO = 0V, CDH = CDL = 50pF
High Side Driver Supply Current (Quiescent)
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 VIDs pulled up to +3.3V
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SC2659
POWER MANAGEMENT DC Electrical Characteristics (Cont.)
Parameter Droop Compensation
Symbols
Conditions
Initial Accuracy Overcurrent Protection
Table)
1.2
%
VID0 - VID25mV High Threshold Voltage
VTH(H)
2.25
V
VID0 - VID25mV Low Threshold Voltage
VTH(L)
1
V
Power Good
Undervoltage Threshold Output Saturation Voltage Hysteresis Over Voltage Protection
2003 Semtech Corp.
2

元器件交易网
SC2659
POWER MANAGEMENT DC Electrical Characteristics (Cont.) Unless specified: 0 < TJ < 125°C, VIN = 12V
ICHG
VSS = 0.5V, resistance from VREFB 10.4 13 15.6 µA
pin to AGND = 20kΩ, VREFB = 1.3V
Note: ICHG = (IVREFB / 5)
Idischg V(SS) = 1V
1
mA
Inhibit Comparator Start Threshold VIN 12V UVLO Start Threshold Hysteresis Hysteretic Comparator Input Offset Voltage Input Bias Current Hysteresis Accuracy Hysteresis Setting
Parameter
Symbols Conditions
Min Typ Max Units
Reference/Voltage Identification
Reference Voltage Accuracy
VREF
11.4V < VIN12V< 12.6V, over full
-1.2
VID range (see Output Voltage
VTH(PWRGD)
VSAT VHYS(PWRGD)
IO = 5mA
82
88 %VREF
0.5
V
10
mV
OVP Trip Point Hysteresis (1) Soft Start
VOVP VHYS(OVP)
12
15
20 %VOUT
10
mV
Charge Current Discharge Current
SC2659 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.
Cin HF
Cin Bulk
IOUTLO 21 LONSE 19
BOOTLO 18 HIGHDR 17
Q1
FDB6035AL R12 1.0
BOOT VIN12V
16 +12V
15
C9 1.0
Q2 FDB7030BL R14 1.6
C10
L2 1.0uH
Cout Bulk