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LTC1929IG Datasheet

  • LTC1929IG

  • 2-Phase, High Efficiency, Synchronous Step-Down Switching Re...

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Final Electrical Specifications
LTC1929
2-Phase, High Efficiency,
Synchronous Step-Down
Switching Regulator
August 1999
FEATURES
s
s
DESCRIPTIO
s
s
s
s
s
s
s
s
s
s
s
s
2-Phase Single Output Controller
Reduces Required Input Capacitance and Power
Supply Induced Noise
Current Mode Control Ensures Current Sharing
Phase-Lockable Fixed Frequency: 150kHz to 300kHz
True Remote Sensing Differential Amplifier
OPTI-LOOP
TM
Compensation Improves Transient
Response
鹵
1% Output Voltage Accuracy
Wide V
IN
Range: 4V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Internal Current Foldback
Short-Circuit Shutdown Timer with Defeat Option
Overvoltage Soft-Latch Eliminates Nuisance Trips
Available in 28-Lead SSOP Package
The LTC
廬
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鈥檚 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.
APPLICATIO S
s
s
s
s
Desktop Computers
Internet/Network Servers
Large Memory Arrays
DC Power Distribution Systems
TYPICAL APPLICATIO
0.1碌F
S
10鈩?/div>
10碌F
脳4
35V
CERAMIC
0.47碌F
S
V
IN
TG1
S
0.1碌F
BOOST1
LTC1929 SW1
RUN/SS
BG1
PGND
SENSE1
+
SENSE1
鈥?/div>
TG2
S
D1
L1
1碌H
1000pF
S
I
TH
10k
S
100pF
S
SGND
V
DIFFOUT
BOOST2
SW2
BG2
S
S
0.47碌F
D2
S
8.06k
S
L2
1碌H
0.002鈩?/div>
+
EAIN
V
OS
鈥?/div>
INTV
CC
SENSE2
+
10碌F
8.06k
V
OS +
SENSE2
鈥?/div>
C
OUT
: T510E108K004AS
L1, L2: CEPH149-1ROMC
Figure 1. High Current 2-Phase Step-Down Converter
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.
U
0.002鈩?/div>
U
U
V
IN
5V TO 28V
V
OUT
1.6V/40A
+
C
OUT
1000碌F
脳2
4V
1929 TA01
1

LTC1929IG 產(chǎn)品屬性

  • LTC1929/-PG

  • 47

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • -

  • 電流模式

  • 1

  • 360kHz

  • 99.5%

  • 4 V ~ 36 V

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • -40°C ~ 85°C

  • 28-SSOP（0.209"，5.30mm 寬）

  • 管件

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