LTC1929I 반도체 회로 부품 판매점
2-Phase/ High Efficiency/ Synchronous Step-Down Switching Regulator
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 Linear Technology |
FEATURES
s 2-Phase Single Output Controller
s Reduces Required Input Capacitance and Power
Supply Induced Noise
s Current Mode Control Ensures Current Sharing
s Phase-Lockable Fixed Frequency: 150kHz to 300kHz
s True Remote Sensing Differential Amplifier
s OPTI-LOOPTM Compensation Improves Transient
Response
s ±1% Output Voltage Accuracy
s Wide VIN Range: 4V to 36V Operation
s Very Low Dropout Operation: 99% Duty Cycle
s Adjustable Soft-Start Current Ramping
s Internal Current Foldback
s Short-Circuit Shutdown Timer with Defeat Option
s Overvoltage Soft-Latch Eliminates Nuisance Trips
s Available in 28-Lead SSOP Package
U
APPLICATIO S
s Desktop Computers
s Internet/Network Servers
s Large Memory Arrays
s DC Power Distribution Systems
Final Electrical Specifications
LTC1929
2-Phase, High Efficiency,
Synchronous Step-Down
Switching Regulator
DESCRIPTIO
August 1999
The LTC®1929 is a 2-phase, single output, synchronous
step-down current mode switching regulator controller
that drives N-channel external power MOSFET stages in a
phase-lockable fixed frequency architecture. The 2-phase
controller drives its two output stages out of phase at
frequencies up to 300kHz to minimize the RMS ripple
currents in both input and output capacitors. The 2-phase
technique effectively multiplies the fundamental frequency
by two, improving transient response while operating
each channel at an optimum frequency for efficiency.
Thermal design is also simplified.
An internal differential amplifier provides true remote
sensing of the regulated supply’s positive and negative
output terminals as required by high current applications.
The RUN/SS pin provides soft-start and a defeatable,
timed, latched short-circuit shutdown to shut down both
channels. Internal foldback current limit provides protec-
tion for the external sychronous MOSFETs in the event of
an output fault. OPTI-LOOP compensation allows the
transient response to be optimized over a wide range of
output capacitance and ESR values.
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
0.1µF
10k
S
S
0.1µF
1000pF
S
100pF
S
8.06k
S
8.06k
VIN TG1
BOOST1
LTC1929 SW1
RUN/SS
BG1
PGND
SENSE1+
ITH SENSE1–
TG2
SGND
BOOST2
SW2
VDIFFOUT
EAIN
VOS–
VOS+
BG2
INTVCC
SENSE2+
SENSE2–
10Ω
S
0.47µF
S
S
S
0.47µF
S
S
10µF
10µF ×4
35V
CERAMIC
L1
1µH
D1
0.002Ω
L2
D2 1µH
0.002Ω
COUT: T510E108K004AS
L1, L2: CEPH149-1ROMC
Figure 1. High Current 2-Phase Step-Down Converter
VIN
5V TO 28V
VOUT
1.6V/40A
+
COUT
1000µF ×2
4V
1929 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
LTC1929
ABSOLUTE AXI U RATI GS
(Note 1)
Input Supply Voltage (VIN).........................36V to – 0.3V
Topside Driver Voltages (BOOST1,2) .........42V to – 0.3V
Switch Voltage (SW1, 2) .............................36V to – 5 V
SENSE1+, SENSE2 +, SENSE1–,
SENSE2 – Voltages ........................ (1.1)INTVCC to – 0.3V
EAIN, VOS+, VOS–, EXTVCC, INTVCC,
RUN/SS, AMPMD Voltages ..........................7V to – 0.3V
Boosted Driver Voltage (BOOST-SW) ..........7V to – 0.3V
PLLFLTR, PLLIN, VDIFFOUT Voltages .... INTVCC to – 0.3V
ITH Voltage ................................................2.7V to – 0.3V
Peak Output Current <1µs(TGL1,2, BG1,2) ................ 3A
INTVCC RMS Output Current ................................ 50mA
Operating Ambient Temperature Range
LTC1929C .................................................. 0°C to 85°C
LTC1929I .............................................. – 40°C to 85°C
Junction Temperature (Note 2) ............................. 125°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
RUN/SS
SENSE1+
SENSE1–
1
2
3
EAIN 4
PLLFLTR 5
PLLIN 6
NC 7
ITH 8
SGND 9
VDIFFOUT 10
VOS– 11
VOS+ 12
SENSE2– 13
SENSE2+ 14
28 NC
27 TG1
26 SW1
25 BOOST1
24 VIN
23 BG1
22 EXTVCC
21 INTVCC
20 PGND
19 BG2
18 BOOST2
17 SW2
16 TG2
15 AMPMD
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
Consult factory for Military grade parts.
ORDER PART
NUMBER
LTC1929CG
LTC1929IG
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
Main Control Loop
VEAIN
VSENSEMAX
IINEAIN
VLOADREG
Regulated Feedback Voltage
Maximum Current Sense Threshold
Feedback Current
Output Voltage Load Regulation
VREFLNREG
VOVL
UVLO
gm
gmOL
IQ
IRUN/SS
VRUN/SS
VRUN/SSLO
ISCL
Reference Voltage Line Regulation
Output Overvoltage Threshold
Undervoltage Lockout
Transconductance Amplifier gm
Transconductance Amplifier Gain
Input DC Supply Current
Normal Mode
Shutdown
Soft-Start Charge Current
RUN/SS Pin ON Threshold
RUN/SS Pin Latchoff Arming
RUN/SS Discharge Current
CONDITIONS
(Note 3); ITH Voltage = 1.2V
VSENSE – = 5V
(Note 3)
(Note 3)
Measured in Servo Loop; ITH Voltage = 0.7V
Measured in Servo Loop; ITH Voltage = 2V
VIN = 3.6V to 30V (Note 3)
Measured at VEAIN
VIN Ramping Down
ITH = 1.2V; Sink/Source 5µA; (Note 3)
ITH = 1.2V; (gmxZL; No Ext Load); (Note 3)
(Note 4)
EXTVCC Tied to VOUT; VOUT = 5V
VRUN/SS = 0V
VRUN/SS = 1.9V
VRUN/SS Rising
VRUN/SS Rising from 3V
Soft Short Condition VEAIN = 0.5V;
VRUN/SS = 4.5V
MIN TYP MAX UNITS
q 0.792
65
0.800
75
–5
0.808
85
– 50
V
mV
nA
0.05 0.3
– 0.1 – 0.5
%
%
0.002
%/V
q 0.84 0.86 0.88
V
3 3.5 4
V
3 mmho
1.5 V/mV
470
20 40
– 1.2
1.0 1.5 1.9
4.1
0.5 2.0 4.0
µA
µA
µA
V
V
µA
2
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