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Linear Technology Electronic Components Datasheet

LTC3850-2 Datasheet

2-Phase Synchronous Step-Down Switching Controller

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FEATURESwww.datasheet4u.com
n Dual, 180° Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
n High Efficiency: Up to 95%
n RSENSE or DCR Current Sensing
n ±1% 0.8V Output Voltage Accuracy
n Phase-Lockable Fixed Frequency 250kHz to 780kHz
n Supports Pre-Biased Output
n Dual N-Channel MOSFET Synchronous Drive
n Wide VIN Range: 4V to 30V Operation
n Adjustable Soft-Start Current Ramping or Tracking
n Foldback Output Current Limiting
n Output Overvoltage Protection
n Power Good Output Voltage Monitor
n 28-Pin Narrow SSOP Package
APPLICATIONS
n Notebook and Palmtop Computers
n Portable Instruments
n Battery-Operated Digital Devices
n DC Power Distribution Systems
L, LT, LTC, LTM, OPTI-LOOP and Burst Mode 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, 6100678, 6144194, 6177787, 6304066, 6580258.
LTC3850-2
Dual, 2-Phase
Synchronous Step-Down
Switching Controller
DESCRIPTION
The LTC®3850-2 is a high performance dual synchronous
step-down switching regulator controller that drives all
N-channel power MOSFET stages. A constant-frequency
current mode architecture allows a phase-lockable
frequency of up to 780kHz. Power loss and supply noise
are minimized by operating the two controller output
stages out of phase.
OPTI-LOOP® compensation allows the transient response
to be optimized over a wide range of output capacitance
and ESR values. The LTC3850-2 features a precision 0.8V
reference and a power good output indicator. A wide 4V
to 30V input supply range encompasses most battery
chemistries and intermediate bus voltages.
Independent TK/SS pins for each controller ramp the
output voltages during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit condi-
tions. The MODE/PLLIN pin selects among Burst Mode®
operation, pulse-skipping mode, or continuous inductor
current mode and allows the IC to be synchronized to an
external clock.
The LTC3850-2 is identical to the LTC3850-1, except they
have different pin assignments.
TYPICAL APPLICATION
VOUT1
3.3V
5A
2.2μH
2.2k
63.4k
100μF
6V
High Efficiency Dual 3.3V/2.5V Step-Down Converter
0.1μF
VIN PGOOD INTVCC
TG1 TG2
BOOST1
BOOST2
SW1
LTC3850-2
BG1
SW2
BG2
500kHz MODE/PLLIN
PGND
EXTVCC FREQ/PLLFLTR
0.1μF
SENSE1+
RUN1
SENSE1
VFB1
SENSE2+
RUN2
SENSE2
VFB2
ITH1 ITH2
220pF
TK/SS1 SGND TK/SS2
20k 15k
0.1μF
0.1μF
4.7μF
0.1μF
22μF
50V
2.2μH
2.2k
0.1μF
10nF
10k
220pF
43.2k
15k 20k
VIN
7V TO
26V
VOUT2
2.5V
5A
100μF
6V
38502 TA01
Efficiency
100
VIN = 12V
95 VOUT = 3.3V
90
EFFICIENCY
85
80
75
70
65
POWER LOSS
60
55
50
10
100 1000
LOAD CURRENT (mA)
10000
1000
100
10
10000
38502 TA01b
38502f
1


Linear Technology Electronic Components Datasheet

LTC3850-2 Datasheet

2-Phase Synchronous Step-Down Switching Controller

No Preview Available !

LTC3850-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN) ......................... 30V to –0.3V
wwwI.dnaptausthSeeutp4up.clyomTransient Voltage (VIN) < 500ms, with
INTVCC ≥ 5V........................................... 34V to –0.3V
Top Side Driver Voltages
BOOST1, BOOST2.................................. 34V to –0.3V
Switch Voltage (SW1, SW2) ......................... 30V to –5V
INTVCC, RUN1, RUN2, PGOOD, EXTVCC,
(BOOST1-SW1), (BOOST2-SW2)................. 6V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages..................................... 5.5V to –0.3V
MODE/PLLIN, TK/SS1,TK/SS2, FREQ/PLLFLTR
Voltages ................................................ INTVCC to –0.3V
ITH1, ITH2, VFB1, VFB2 Voltages .................. 2.7V to –0.3V
INTVCC Peak Output Current ................................100mA
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range...................–65°C to 125°C
Lead Temperature (Soldering, 10 sec)
(GN Package).................................................... 300°C
PIN CONFIGURATION
TOP VIEW
RUN1
SENSE1+
SENSE1
1
2
3
VFB1 4
TK/SS1 5
ITH1 6
SGND 7
ITH2 8
TK/SS2 9
VFB2 10
SENSE211
SENSE2+ 12
RUN2 13
EXTVCC 14
28 FREQ/PLLFLTR
27 MODE/PLLIN
26 SW1
25 TG1
24 BOOST1
23 BG1
22 VIN
21 INTVCC
20 BG2
19 PGND
18 BOOST2
17 TG2
16 SW2
15 PGOOD
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3850IGN-2#PBF
LTC3850IGN-2#TRPBF LTC3850GN-2
28-Lead Narrow Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
38502f
2


Part Number LTC3850-2
Description 2-Phase Synchronous Step-Down Switching Controller
Maker Linear Technology
Total Page 30 Pages
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