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LTC7815 Datasheet

Buck/Buck/Boost Synchronous Controller

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LTC7815
Low IQ, 2.25MHz,
Triple Output, Buck/Buck/Boost
Synchronous Controller
FEATURES
DESCRIPTION
n Dual Buck Plus Single Boost Synchronous Controllers
n Wide Bias Input Voltage Range: 4.5V to 38V
n Outputs Remain in Regulation Through Cold Crank
Down to a 2.5V Input Supply Voltage
n Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
n Boost Output Voltage Up to 60V
n Low Operating IQ: 28μA (One Channel On)
n RSENSE or DCR Current Sensing
n 100% Duty Cycle for Boost Synchronous MOSFET
Even in Burst Mode® Operation
n Phase-Lockable Frequency (320kHz to 2.25MHz)
n Programmable Fixed Frequency (320kHz to 2.25MHz)
n Very Low Buck Dropout Operation: 98% Duty Cycle
n Small 38-Lead 5mm × 7mm QFN Package
APPLICATIONS
n Automotive Always-On and Start-Stop Systems
n Battery Operated Digital Devices
n Distributed DC Power Systems
n Multioutput Buck-Boost Applications
The LTC®7815 is a high performance triple output (buck/
buck/boost) synchronous DC/DC switching regulator con-
troller that drives all N-channel power MOSFET stages.
Constant frequency current mode architecture allows a
phase-lockable switching frequency of up to 2.25MHz.
The LTC7815 operates from a wide 4.5V to 38V input
supply range. When biased from the output of the boost
converter or another auxiliary supply, the LTC7815 can
operate from an input supply as low as 2.5V after start-up.
The 28μA no-load quiescent current extends operating
runtime in battery powered systems. OPTI-LOOP com-
pensation allows the transient response to be optimized
over a wide range of output capacitance and ESR values.
The LTC7815 features a precision 0.8V reference for the
bucks, 1.2V reference for the boost and a power good
output indicator. The PLLIN/MODE pin selects among
Burst Mode operation, pulse-skipping mode, or continu-
ous inductor current mode at light loads.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents including 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.
TYPICAL APPLICATION
VOUT3
REGULATED AT 10V WHEN VIN < 10V
FOLLOWS VIN WHEN VIN > 10V
+ 68µF
10µF
×5
499k
VFB3
68.1k
VBIAS
TG1
VIN
2.5V TO 28V
(START-UP ABOVE 5V)
+ 220µF
3mΩ 0.16µH
10µF
×2 4.7µF
SW1, 2, 3
TG3 SW1
SW3 LTC7815 BG1
BG3
SENSE3
SENSE3+
INTVCC
SENSE1+
SENSE1
VFB1
BOOST1, 2, 3
0.1µF
ITH1, 2, 3
EXTVCC
TG2
SW2
BG2
VOUT1
0.1µF
TRACK/SS1, 2
SS3
SENSE2+
SENSE2
VFB2
RUN1
RUN2
RUN3
FREQ
PGND SGND
7815 TA01a
0.33µH 3mΩ
68.1k 357k
0.33µH 3mΩ
68.1k 210k
100k
VOUT1
5V
7A
COUT1
47µF
×2
VOUT2
3.3V
10A
COUT2
33µF
×2
For more information www.linear.com/LTC7815
Efficiency and Power Loss vs
Output Current
100
90
VIN = 12V
VOUT1 = 5V
80
10k
1k
70
60 100
50
40 10
30
20
10
0
0.0001
f = 2.1MHz
1
Burst Mode OPERATION
BURST LOSS
0.1
0.001 0.01 0.1 1 10
LOAD CURRENT (A)
7815 TA01b
7815f
1


Linear Technology Electronic Components Datasheet

LTC7815 Datasheet

Buck/Buck/Boost Synchronous Controller

No Preview Available !

LTC7815
ABSOLUTE MAXIMUM RATINGS (Note 1)
Bias Input Supply Voltage (VBIAS)............... –0.3V to 40V
Buck Top Side Driver Voltages
(BOOST1, BOOST2) .............................. –0.3V to 46V
Boost Top Side Driver Voltages
(BOOST3) ............................................. –0.3V to 71V
Buck Switch Voltage (SW1, SW2) ................. –5V to 40V
Boost Switch Voltage (SW3) ......................... –5V to 65V
INTVCC, (BOOST1–SW1),
(BOOST2–SW2), (BOOST3–SW3)............ –0.3V to 6V
BG1, BG2, BG3, TG1, TG2, TG3....................... (Note 8)
RUN1, RUN2, RUN3 ..................................... –0.3V to 8V
Maximum Current Sourced Into Pin
from Source >8V...............................................100µA
SENSE1+, SENSE2+, SENSE1
SENSE2Voltages.................................. –0.3V to 28V
SENSE3+, SENSE3Voltages...................... –0.3V to 40V
FREQ Voltages.......................................–0.3V to INTVCC
EXTVCC....................................................... –0.3V to 14V
ITH1, ITH2, ITH3, VFB1, VFB2, VFB3 Voltages..... –0.3V to 6V
PLLIN/MODE, PGOOD1, OV3 Voltages ......... –0.3V to 6V
TRACK/SS1, TRACK/SS2, SS3 Voltages ...... –0.3V to 6V
Operating Junction Temperature Range (Notes 2, 3)
LTC7815E, LTC7815I........................... –40°C to 125°C
LTC7815H........................................... –40°C to 150°C
Storage Temperature Range............... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FREQ 1
PLLIN/MODE 2
SS3 3
SENSE3+ 4
SENSE35
VFB3 6
ITH3 7
SGND 8
RUN1 9
RUN2 10
RUN3 11
SENSE212
38 37 36 35 34 33 32
39
PGND
13 14 15 16 17 18 19
31 SW1
30 BOOST1
29 BG1
28 SW3
27 TG3
26 BOOST3
25 BG3
24 VBIAS
23 EXTVCC
22 INTVCC
21 BG2
20 BOOST2
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
TJMAX = 150°C,qJA = 34.7°C/W, qJC = 2°C/W
EXPOSED PAD (PIN 39) IS PGND, MUST BE SOLDERED TO PCB
7815f
2 For more information www.linear.com/LTC7815


Part Number LTC7815
Description Buck/Buck/Boost Synchronous Controller
Maker Linear Technology
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LTC7815 Datasheet PDF






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