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LTC3876 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3876
Description  Fast, Accurate, 2-Phase, Single-Output Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3876 Datasheet(HTML) 1 Page - Linear Technology

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LTC3839
1
3839fa
TYPICAL APPLICATION
FEATURES
DESCRIPTION
Fast, Accurate, 2-Phase,
Single-Output Step-Down DC/DC
Controller with Differential Output Sensing
The LTC®3839 is a 2-phase, single-output PolyPhase®
synchronous step-down switching regulator controller
that drives all N-channel power MOSFETs. The controlled
on-time, valley current mode control architecture allows for
fast transient response and constant frequency switching
in steady-state operation, independent of VIN, VOUT and
load current. Its load-release transient detection feature
significantly reduces overshoot at low output voltages.
Differential output voltage sensing, along with a preci-
sion internal reference, offers an accurate ±0.67% output
regulation, even if the remote output ground deviates from
local ground by ±500mV.
The switching frequency can be programmed from 200kHz
to 2MHz with an external resistor and can be synchronized
to an external clock. Very low tON and tOFF times allow for
near 0% and near 100% duty cycles, respectively. Volt-
age tracking soft start-up and multiple safety features are
provided.
3.3V/25A Output, 2MHz Step-Down Converter (Refer to Figure 20 for Full Design)
APPLICATIONS
n Wide VIN Range: 4.5V to 38V, VOUT: 0.6V to 5.5V
n ±0.67% Output Voltage Accuracy Over Temperature,
Differential Output Voltage Sensing, Allowing Up to
±500mV Line Loss at Remote Ground
n Controlled On-Time, Valley Current Mode Control
n Fast Load Transient Response
n Detect Transient (DTR) Reduces VOUT Overshoot
n Frequency Programmable from 200kHz to 2MHz,
Synchronizable to External Clock
n tON(MIN) = 30ns, tOFF(MIN) = 90ns
n Up to 12-Phase Operation
n RSENSE or Inductor DCR Current Sensing
n Overvoltage Protection and Current Limit Foldback
n Power Good Output Voltage Monitor
n Output Voltage Tracking and Adjustable Soft Start-Up
n Thermally Enhanced 32-Pin (5mm
× 5mm) QFN
Package
n Distributed Power Systems
n Point-of-Load Converters
n Computing Systems
n Data Communication Systems
L, LT, LTC, LTM, PolyPhase, OPTI-LOOP, Linear Technology and the Linear logo are
registered trademarks and Hot Swap and Stage Shedding are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by U.S.
Patents, including 5481178, 5847554, 6580258, 6304066, 6476589, 6774611.
Efficiency/Power Loss
LOAD CURRENT (A)
0.1
80
90
100
1
10
100
3839 TA01b
70
60
50
6
10
8
4
2
0
VIN = 5V
FORCED
CONTINUOUS
MODE
LOSS
DCM
LOSS
FORCED CM
DISCONTINUOUS
MODE
18.7k
SENSE1
SENSE1+
SENSE2
SENSE2+
VIN
BOOST1
DRVCC1
TG1
MODE/PLLIN
CLKOUT
PHASMD
RUN
DTR
BG1
PGND
BG2
DRVCC2
VOUTSENSE+
VOUTSENSE–
TRACK/SS
ITH
4.7μF
VIN
4.5V TO 14V
VOUT
3.3V
25A
0.1μF
0.1μF
100μF
6
45.3k
10k
0.3μH
0.3μH
3839 TA01a
RT
SGND
SW1
BOOST2
LTC3839
TG2
INTVCC
SW2
+


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