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Linear Technology Electronic Components Datasheet

LTC3707IGN Datasheet

2-Phase Synchronous Step-Down Switching Regulator

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FEATURES
180° Phased Dual Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes COUT
±1.5% Output Voltage Accuracy over Temperature
Dual N-Channel MOSFET Synchronous Drive
Power Good Output Voltage Monitor
DC Programmed Fixed Frequency 150kHz to 300kHz
Wide VIN Range: 4.5V to 28V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
Output Overvoltage Protection
Remote Output Voltage Sense
Low Shutdown IQ: 20μA
5V and 3.3V Standby Regulators
Selectable Constant Frequency, Burst Mode®
Operation or PWM Operation
Small 28-Lead Narrow SSOP Package
APPLICATIONS
Notebook and Palmtop Computers, PDAs
Battery Chargers
Portable Instruments
Battery-Operated Digital Devices
DC Power Distribution Systems
LTC3707
High Efficiency, 2-Phase
Synchronous Step-Down
Switching Regulator
DESCRIPTION
The LTC®3707 is a high performance dual step-down
switching regulator controller that drives N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows adjustment of the
frequency up to 300kHz. Power loss and noise due to the
ESR of the input capacitors 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 precision 0.8V reference and power good
output indicator are compatible with future microprocessor
generations, and a wide 3.5V to 30V input supply range
encompasses all battery chemistries.
A RUN/SS pin for each controller provides both soft-start
and optional timed, short-circuit shutdown. Current
foldback limits MOSFET dissipation during short-circuit
conditions when overcurrent latchoff is disabled. Output
overvoltage protection circuitry latches on the bottom
MOSFET until VOUT returns to normal. The FCB mode
pin can select among Burst Mode operation, constant
frequency mode and continuous inductor current mode
or regulate a secondary winding.
L, LT, LTC, LTM, Burst Mode, and OPTI-LOOP 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, 6304066, 6580258.
TYPICAL APPLICATION
M1
L1
6.3μH
D1
M2
RSENSE1
0.01Ω
VOUT1
5V
5A
R2
105k
+
COUT1
47μF
1%
6V
SP
R1
20k
1%
+
4.7μF
CB1, 0.1μF
D3
VIN
TG1
INTVCC
TG2
BOOST1
BOOST2
SW1
SW2
LTC3707
BG1
BG2
1000pF
CC1
220pF
RC1
15k
SGND
SENSE1+
PGND
SENSE2+
SENSE1
VOSENSE1
ITH1
RUN/SS1
CSS1
0.1μF
SENSE2
VOSENSE2
ITH2
RUN/SS2
CSS2
0.1μF
1μF
D4
CERAMIC
M3
CB2, 0.1μF
M4
1000pF
CC2
220pF
R3
RC2
15k
20k
1%
VIN
CIN 5.2V TO 28V
22μF
50V
CERAMIC
L2
6.3μH
D2
RSENSE2
0.01Ω
R4
63.4k
1%
COUT
56μF
6V
SP
VOUT2
3.3V
5A
M1, M2, M3, M4: FDS6680A
3707 F01
Figure 1. High Efficiency Dual 5V/3.3V Step-Down Converter
3707fb
1


Linear Technology Electronic Components Datasheet

LTC3707IGN Datasheet

2-Phase Synchronous Step-Down Switching Regulator

No Preview Available !

LTC3707
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN) .........................30V to – 0.3V
Top Side Driver Voltages
(BOOST1, BOOST2) ................................... 36V to –0.3V
Switch Voltage (SW1, SW2) ......................... 30V to –5V
INTVCC, EXTVCC, RUN/SS1, RUN/SS2, (BOOST1-SW1),
(BOOST2-SW2), PGOOD.............................. 7V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages .........................(1.1)INTVCC to –0.3V
FREQSET, STBYMD, FCB Voltage ......... INTVCC to –0.3V
ITH1, ITH2, VOSENSE1, VOSENSE2 Voltages ... 2.7V to –0.3V
Peak Output Current <10μs (TG1, TG2, BG1, BG2).....3A
INTVCC Peak Output Current ................................. 40mA
Operating Temperature Range (Note 2).... –40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
PIN CONFIGURATION
RUN/SS1 1
SENSE1+ 2
SENSE13
VOSENSE1 4
FREQSET 5
STBYMD 6
FCB 7
ITH1 8
SGND 9
3.3VOUT 10
ITH2 11
VOSENSE2 12
SENSE213
SENSE2+ 14
TOP VIEW
28 PGOOD
27 TG1
26 SW1
25 BOOST1
24 VIN
23 BG1
22 EXTVCC
21 INTVCC
20 PGND
19 BG2
18 BOOST2
17 SW2
16 TG2
15 RUN/SS2
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3707EGN#PBF
LTC3707EGN#TRPBF 3707EGN
28-Lead Plastic SSOP
LTC3707IGN#PBF
LTC3707IGN#TRPBF
3707IGN
28-Lead Plastic SSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3707EGN
LTC3707EGN#TR
3707EGN
28-Lead Plastic SSOP
LTC3707IGN
LTC3707IGN#TR
3707IGN
28-Lead Plastic SSOP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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
–40°C to 85°C
TEMPERATURE RANGE
–40°C to 85°C
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted.
SYMBOL
VOSENSE1, 2
IOSENSE1, 2
VREFLNREG
VLOADREG
PARAMETER
Regulated Feedback Voltage
Feedback Current
Reference Voltage Line Regulation
Output Voltage Load Regulation
gm1,2
Transconductance Amplifier gm
CONDITIONS
(Note 4); ITH1, 2 Voltage = 1.2V
l
(Note 4)
VIN = 3.6V to 30V (Note 4)
(Note 4)
Measured in Servo Loop; ΔITH Voltage = 1.2V to 0.7V l
Measured in Servo Loop; ΔITH Voltage = 1.2V to 2.0V l
ITH1, 2 = 1.2V; Sink/Source 5μA; (Note 4)
MIN
0.788
TYP
0.800
–5
0.002
MAX UNITS
0.812 V
–50 nA
0.02 %/V
0.1 0.5
%
–0.1 –0.5 %
1.3
mmho
3707fb
2


Part Number LTC3707IGN
Description 2-Phase Synchronous Step-Down Switching Regulator
Maker Linear
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