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Analog Devices Semiconductor Electronic Components Datasheet

LTC3892IUH Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3892/
LTC3892-1/LTC3892-2
FEATURES
60V Low IQ, Dual, 2-Phase
Synchronous Step-Down
DC/DC Controller
DESCRIPTION
nn Wide VIN Range: 4.5V to 60V (65V Abs Max)
nn Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 99% • VIN
nn Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
nn No External Bootstrap Diodes Required
nn Low Operating IQ: 29μA (One Channel On)
nn Selectable Gate Drive UVLO Thresholds
nn Out-of-Phase Operation Reduces Required Input
Capacitance and Power Supply Induced Noise
nn Phase-Lockable Frequency: 75kHz to 850kHz
nn Selectable Continuous, Pulse Skipping or Low Ripple
Burst Mode® Operation at Light Loads
nn Selectable Current Limit (LTC3892/LTC3892-2)
nn Very Low Dropout Operation: 99% Duty Cycle
nn Power Good Output Voltage Monitors (LTC3892/LTC3892-2)
nn Low Shutdown IQ: 3.6μA
nn Small 32-Lead 5mm × 5mm QFN Package (LTC3892/
LTC3892-2) or TSSOP Package (LTC3892-1)
APPLICATIONS
nn Automotive and Industrial Power Systems
nn Distributed DC Power Systems
nn High Voltage Battery Operated Systems
The LTC®3892/LTC3892-1/LTC3892-2 is a high perfor-
mance dual step-down DC/DC switching regulator control-
ler 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.
A wide 4.5V to 60V input supply range encompasses a wide
range of intermediate bus voltages and battery chemistries.
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 comparison of the
LTC3892 to the LTC3892-1 and LTC3892-2, see Table 1
in the Pin Functions section of this data sheet.
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are
registered trademarks of Analog Devices, Inc. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5481178, 5705919, 5929620, 6144194,
6177787, 6580258.
TYPICAL APPLICATION
High Efficiency Dual 5V/12V Output Step-Down Converter
VIN
12.5V TO 60V
47µF
VOUT1
5V
8A
220µF
5mΩ 5.6µH
0.1µF
RUN1 VIN RUN2
TG1
BOOST1
TG2
BOOST2
SW1
SW2
BG1
BG2
LTC3892
0.1µF
15µH 8mΩ
SENSE1+
1nF
SENSE1–
SENSE2+
SENSE2–
1nF
VFB1
ITH1
TRACK/SS1
VFB2
ITH2
TRACK/SS2
VPRG1
DRVSET
7.5k
DRVUV
100pF
2.2nF
0.1µF
INTVCC GND DRVCC
0.1µF
4.7µF
34.8k
0.1µF 100pF
1nF
VOUT2
12V
5A
150µF
100k
7.15k
3892 TA01
For more information www.linear.com/LTC3892
EEffficciieenncycyvsvOsutOpuuttpCuurtreCnut rrent
96
VIN = 12V
95 VOUT = 5V
Burst Mode OPERATION
94
93
92
91
90
89
88
0.01
GATE DRIVE
DRVCC=5V
DRVCC=6V
DRVCC=8V
DRVCC=10V
0.1
1
LOAD CURRENT (A)
10
3892 F01b
38921fc
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3892IUH Datasheet

2-Phase Synchronous Step-Down DC/DC Controller

No Preview Available !

LTC3892/
LTC3892-1/LTC3892-2
ABSOLUTE MAXIMUM RATINGS (Notes 1, 3)
Input Supply Voltage (VIN).......................... –0.3V to 65V
Top Side Driver Voltages
(BOOST1, BOOST2)................................ –0.3V to 76V
Switch Voltage (SW1, SW2)........................... –5V to 70V
DRVCC, (BOOST1-SW1),
(BOOST2-SW2)........................................–0.3V to 11V
BG1, BG2, TG1, TG2............................................ (Note 8)
RUN1, RUN2 Voltages................................. –0.3V to 65V
SENSE1+, SENSE2+, SENSE1
SENSE2Voltages.................................. –0.3V to 65V
PLLIN/MODE, FREQ Voltages....................... –0.3V to 6V
EXTVCC Voltage.......................................... –0.3V to 14V
ITH1, ITH2, VFB1, VFB2 Voltages...................... –0.3V to 6V
DRVSET, DRVUV Voltages............................ –0.3V to 6V
TRACK/SS1, TRACK/SS2 Voltages............... –0.3V to 6V
PGOOD1, PGOOD2 Voltages
(LTC3892/LTC3892-2).............................. –0.3V to 6V
VPRG1, ILIM Voltages
(LTC3892/LTC3892-2).............................. –0.3V to 6V
Operating Junction Temperature Range (Note 2)
LTC3892E, LTC3892I,
LTC3892E-1, LTC3892I-1,
LTC3892E-2, LTC3892I-2.................... –40°C to 125°C
LTC3892H,
LTC3892H-1, LTC3892H-2.................. –40°C to 150°C
LTC3892MP, LTC3892MP-1,
LTC3892MP-2..................................... –55°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
LTC3892/LTC3892-2
TOP VIEW
32 31 30 29 28 27 26 25
FREQ 1
24 BOOST1
PLLIN/MODE 2
23 BG1
PGOOD1 3
PGOOD2 4
INTVCC 5
RUN1 6
22 VIN
33
21 EXTVCC
GND
20 DRVCC
19 BG2
RUN2 7
18 BOOST2
ILIM 8
17 SW2
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 44°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE CONNECTED TO GND
LTC3892-1
TOP VIEW
ITH1 1
28 TRACK/SS1
VFB1 2
SENSE1+ 3
SENSE14
27 TG1
26 SW1
25 BOOST1
FREQ 5
24 BG1
PLLIN/MODE 6
23 VIN
INTVCC 7
29
22 EXTVCC
RUN1 8
GND
21 DRVCC
RUN2 9
SENSE210
SENSE2+ 11
20 BG2
19 BOOST2
18 SW2
VFB2 12
ITH2 13
17 TG2
16 TRACK/SS2
DRVUV 14
15 DRVSET
FE PACKAGE
28-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 30°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE CONNECTED TO GND
38921fc
2
For more information www.linear.com/LTC3892


Part Number LTC3892IUH
Description 2-Phase Synchronous Step-Down DC/DC Controller
Maker Analog Devices
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