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LTC3892-1 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3892-1
Description  60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3892-1 Datasheet(HTML) 1 Page - Linear Technology

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LTC3892/LTC3892-1
1
38921f
For more information www.linear.com/LTC3892
Typical applicaTion
FeaTures
DescripTion
60V Low IQ, Dual, 2-Phase
Synchronous Step-Down
DC/DC Controller
The LTC®3892/LTC3892-1 is a high performance dual
step-down DC/DC switching regulator controller that
drives all N-channel synchronous power MOSFET stages.
Power loss and noise are minimized by operating the two
controller output stages out-of-phase.
The gate drive voltage can be programmed from 5V to
10V to allow the use of logic or standard-level FETs and
to maximize efficiency. Internal switches in the top gate
drivers eliminate the need for external bootstrap diodes.
Awide4.5Vto60Vinputsupplyrangeencompassesawide
rangeofintermediatebusvoltagesandbatterychemistries.
Output voltages up to 99% of VIN can be regulated. OPTI-
LOOP® compensation allows the transient response and
loop stability to be optimized over a wide range of output
capacitance and ESR values.
The 29μA no-load quiescent current extends operating
run time in battery powered systems. For a comparision
of the LTC3892 to the LTC3892-1, see Table 1 in the Pin
Functions section of this data sheet.
High Efficiency Dual 5V/12V Output Step-Down Converter
n
Wide VIN Range: 4.5V to 60V (65V Abs Max)
n
Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN
n
Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
n
No External Bootstrap Diodes Required
n
Low Operating IQ: 29μA (One Channel On)
n
Selectable Gate Drive UVLO Thresholds
n
Out-of-Phase Operation Reduces Required Input
Capacitance and Power Supply Induced Noise
n
Phase-Lockable Frequency: 75kHz to 850kHz
n
Programmable Fixed Frequency: 50kHz to 900kHz
n
Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode® Operation at Light Loads
n
Selectable Current Limit (LTC3892)
n
Very Low Dropout Operation: 99% Duty Cycle
n
Power Good Output Voltage Monitors (LTC3892)
n
Low Shutdown IQ: 3.6μA
n
Small 32-Lead 5mm
× 5mm QFN Package (LTC3892)
n
Small 28-Lead TSSOP Package (LTC3892-1)
L
, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620,
6144194, 6177787, 6580258.
4.7µF
0.1µF
15µH
8m
100pF
100k
7.15k
34.8k
1nF
150µF
1nF
0.1µF
0.1µF
5.6µH
5m
7.5k
47µF
100pF
0.1µF
2.2nF
0.1µF
220µF
1nF
LTC3892
VIN
RUN2
INTVCC
GND
SW2
BG2
TG2
BOOST2
SENSE2+
VFB2
ITH2
TRACK/SS2
12V
SENSE2–
DRVUV
DRVCC
RUN1
SW1
BG1
TG1
BOOST1
SENSE1+
VFB1
ITH1
TRACK/SS1
SENSE1–
DRVSET
VPRG1
VOUT2
5A
VIN
12.5V TO 60V
5V
VOUT1
8A
3892 TA01
applicaTions
n
Automotive and Industrial Power Systems
n
Distributed DC Power Systems
n
High Voltage Battery Operated Systems
VIN = 12V
VOUT = 5V
Burst Mode OPERATION
GATE DRIVE
DRVCC=5V
DRVCC=6V
DRVCC=8V
DRVCC=10V
LOAD CURRENT (A)
0.01
0.1
1
10
88
89
90
91
92
93
94
95
96
Efficiency vs Output Current
3892 F01b
Efficiency vs Output Current


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