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LTC3897 Datasheet

PolyPhase Synchronous Boost Controller

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FEATURES
n Input Supply Range: 4.5V to 65V (Up to 75V Surge)
n Reverse Input Protection to –40V
n In-Rush Current Control, Overcurrent Protection
and Output Disconnect for Boost Converter
n Input Voltage Surge Protection with Adjustable
Clamp Voltage
n Onboard Ideal Diode Controller
n Low Quiescent Current: 55µA
n 2-Phase Operation Reduces Required Input and
Output Capacitance and Noise
n Output Voltage Up to 60V
n Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE)
for Logic-Level or Standard Threshold FETs
n No External Bootstrap Diodes Required
APPLICATIONS
n Industrial
n Automotive
n Military/Avionics
LTC3897
PolyPhase Synchronous
Boost Controller with Input/
Output Protection
DESCRIPTION
The LTC®3897 is a synchronous boost DC/DC controller
with surge stopper and ideal diode controller.
The boost controller drives two N-channel power MOSFET
stages out-of-phase to reduce input and output capacitor
requirements, allowing the use of smaller inductors than
the single-phase equivalent. Synchronous rectification
reduces power loss and eases thermal requirements.
The surge stopper controls the gate of an external
N-channel MOSFET to protect against high voltage input
transients and provides in-rush current control, over-
current protection and output disconnect for the boost
converter. The integrated ideal diode controller drives
another N-channel MOSFET to replace a Schottky diode
for reverse input protection and voltage holdup or peak
detection. It controls the forward voltage drop across the
MOSFET and minimizes reverse current flow.
The LTC3897 is available in thermally-enhanced 38-pin
leadless QFN or 38-lead TSSOP packages.
All registered trademarks and trademarks are the property of their respective owners.
Protected by U.S. patents, including 5408150, 5481178, 5705919, 5929620, 6144194,
6177787, 6580258.
TYPICAL APPLICATION
24V/10A 2-Phase Synchronous Boost Converter with Surge Protection and Reverse Protection
INPUT VOLTAGE SURGE PROTECTION
IN-RUSH/OVERCURRENT PROTECTION
REVERSE CURRENT PROTECTION (IDEAL DIODE)
REVERSE INPUT VOLTAGE PROTECTION
5mΩ 3.5µH
VIN
6V TO
55V
10Ω
2mΩ
33µF 549k
12.1k
VBIAS
SPFB
SENSE1+
SENSE1–
BG1 0.1µF
BOOST1
10nF IS– SW1
IS+
DG
TG1 5mΩ
CS
SG
LTC3897 SSEENNSSEE22+
0.1µF
VIN
RUN
BG2
0.1µF
15nF
8.66k
1µF
SS
ITH
BOOST2
SW2
TG2
PINS NOT SHOWN IN THIS CIRCUIT:
PLLIN/MODE, ILIM, PHASMD,
CLKOUT, EXTVCC, SGEN, DGEN
VIN OPERATES THROUGH TRANSIENTS UP TO 75V.
WHEN VIN > 24V, VOUT FOLLOWS VIN UP TO 57V.
INTVCC
4.7µF DRVCC
DRVSET
DRVUV FREQ
VFB
DTC
GND TMR
1nF
3.5µH
475k
24.9k
3897 TA01a
VOUT
24V
10A
220µF
Efficiency and Power Loss
vs Output Current
100
BURST EFFICIENCY
90
100k
80 10k
70
60 1k
BURST LOSS
50
40 100
30
20
10
0
0.001
VIN = 12V
VOUT = 24V
Burst Mode OPERATION
FIGURE 17 CIRCUIT
10
0.01 0.1
1
1
10
OUTPUT CURRENT (A)
3897 TA01b
Document Feedback
For more information www.analog.com
Rev. A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3897 Datasheet

PolyPhase Synchronous Boost Controller

No Preview Available !

LTC3897
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VVSEIBNINA, SSS,EGI1SE+N+, ,S..I.ES..N..,S...E....2....+....,....S....E....N....S......E..1........,....S....E....N......S....E....2....................–....4....0....V........t..o......767656VVV
CS................................................................ –40V to 76V
SG, DG (Note 8)............................CS – 0.3V to CS + 10V
BOOST1 and BOOST2..................................–0.3V to 71V
SW1 and SW2................................................ –5V to 65V
BG1, BG2, TG1, TG2............................................ (Note 9)
RUN, DGEN................................................. –0.3V to 76V
PLLIN/MODE, TMR, VFB, SPFB..................... –0.3V to 6V
INTVCC.......................................................... –0.3V to 6V
EXTVCC....................................................... –0.3V to 14V
D(SREVNCSCE,1(+B-OSOENSTS1E-1SW), 1), (BOOST2-SW2).....–0.3V to 11V
(SENSE2+-SENSE2).............................. –0.3V to 0.3V
ILIM, SS, ITH, FREQ,
PHASMD, DTC........................ –0.3V to INTVCC + 0.3V
DRVUV, DRVSET.........................–0.3V to INTVCC + 0.3V
Operating Junction Temperature Range
(Notes 2, 3)......................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
SGEN 1
DGEN 2
PLLIN/MODE 3
FREQ 4
PHASMD 5
ILIM
SENSE1+
SENSE1
6
7
8
DTC 9
DRVUV 10
DRVSET 11
INTVCC 12
RUN 13
ITH
SENSE2
SENSE2+
14
15
16
VFB 17
SS 18
CLKOUT 19
TOP VIEW
39
GND
38 TMR
37 SPFB
36 IS
35 IS+
34 DG
33 CS
32 SG
31 VIN
30 TG1
29 SW1
28 BOOST1
27 BG1
26 VBIAS
25 EXTVCC
24 DRVCC
23 BG2
22 BOOST2
21 SW2
20 TG2
FE PACKAGE
38-LEAD PLASTIC TSSOP
θJA = 28°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FREQ 1
PHASMD 2
ILIM 3
SENSE1+ 4
SENSE15
DTC 6
DRVUV 7
DRVSET 8
INTVCC 9
RUN 10
ITH 11
SENSE212
38 37 36 35 34 33 32
39
GND
13 14 15 16 17 18 19
31 DG
30 CS
29 SG
28 VIN
27 TG1
26 SW1
25 BOOST1
24 BG1
23 VBIAS
22 EXTVCC
21 DRVCC
20 BG2
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
θJA = 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
Rev. A
2 For more information www.analog.com


Part Number LTC3897
Description PolyPhase Synchronous Boost Controller
Maker Analog Devices
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LTC3897 Datasheet PDF






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