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Linear Technology Electronic Components Datasheet

LTC3827IG-1 Datasheet

2-Phase Synchronous Step-Down Controller

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LTC3827-1
Low IQ, Dual, 2-Phase
Synchronous Step-Down Controller
FEATURES
DESCRIPTION
n Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 10V
n Low Operating IQ: 80μA (One Channel On)
n Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
n OPTI-LOOP® Compensation Minimizes COUT
n ±1% Output Voltage Accuracy
n Wide VIN Range: 4V to 36V Operation
n Phase-Lockable Fixed Frequency 140kHz to 650kHz
n Selectable Continuous, Pulse-Skipping or Low Ripple
Burst Mode® Operation at Light Loads
n Dual N-Channel MOSFET Synchronous Drive
n Very Low Dropout Operation: 99% Duty Cycle
n Adjustable Output Voltage Soft-Start or Tracking
n Output Current Foldback Limiting
n Power Good Output Voltage Monitor
n Output Overvoltage Protection
n Low Shutdown IQ: 8μA
n Internal LDO Powers Gate Drive from VIN or VOUT
n Small 28-Lead SSOP Package
APPLICATIONS
n Automotive Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
The LTC®3827-1 is a high performance dual step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant frequency
current mode architecture allows a phase-lockable fre-
quency of up to 650kHz. Power loss and noise due to the
ESR of the input capacitor ESR are minimized by operating
the two controller output stages out of phase.
The 80μA no-load quiescent current extends operating
life in battery-powered systems. OPTI-LOOP compensa-
tion allows the transient response to be optimized over
a wide range of output capacitance and ESR values. The
LTC3827-1 features a precision 0.8V reference and a power
good output indicator. A wide 4V to 36V input supply range
encompasses all battery chemistries.
Independent TRACK/SS pins for each controller ramp the
output voltage during start-up. Current foldback limits
MOSFET heat dissipation during short-circuit conditions.
The PLLIN/MODE pin selects among Burst Mode opera-
tion, pulse-skipping mode, or continuous inductor cur-
rent mode at light loads. For a leadless package version
(5mm × 5mm QFN) with additional features, see the
LTC3827 data sheet.
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, 5929620, 6177787, 6144194, 5408150,
6580258, 6304066, 5705919.
TYPICAL APPLICATION
VOUT1
3.3V
5A
3.3μH
0.015Ω
62.5k
150μF
High Efficiency Dual 8.5V/3.3V Step-Down Converter
+
4.7μF
0.1μF
VIN
TG1
BOOST1
SW1
INTVCC
TG2
BOOST2
SW2
1μF
0.1μF
22μF
50V
VIN
4V TO 36V
7.2μH
BG1
BG2
LTC3827-1
PGND
SENSE1+
SENSE2+
0.015Ω
SENSE1
SENSE2
VFB1
VFB2
ITH1
ITH2
20k
220pF TRACK/SS1 SGND TRACK/SS2
15k
0.1μF
0.1μF
220pF
15k
192.5k
20k
VOUT2
8.5V
3.5A
150μF
38271 TA01
Efficiency and Power Loss
vs Load Current
100
100000
90
EFFICIENCY
VIN = 12V; VOUT = 3.3V
10000
80
70
1000
60
50
100
40
30
POWER LOSS 10
20
1
10
0
0.001 0.01
0.1 1 10 100
LOAD CURRENT (mA)
0.1
1000 10000
38271 TA01b
FIGURE 13 CIRCUIT
38271fe
1


Linear Technology Electronic Components Datasheet

LTC3827IG-1 Datasheet

2-Phase Synchronous Step-Down Controller

No Preview Available !

LTC3827-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN) .........................36V to – 0.3V
Topside Driver Voltages
BOOST1, BOOST2.................................. 42V to –0.3V
Switch Voltage (SW1, SW2) ......................... 36V to –5V
(BOOST1-SW1), (BOOST2-SW2) ............. 8.5V to –0.3V
RUN1, RUN2 ............................................... 7V to –0.3V
SENSE1+, SENSE2+, SENSE1,
SENSE2Voltages ..................................... 11V to –0.3V
PLLIN/MODE, PLLLPF, TRACK/SS1, TRACK/SS2
Voltages ............................................... INTVCC to –0.3V
EXTVCC ...................................................... 10V to –0.3V
ITH1, ITH2, VFB1, VFB2 Voltages .................. 2.7V to –0.3V
PGOOD1 Voltage....................................... 8.5V to –0.3V
Peak Output Current <10μs (TG1, TG2, BG1, BG2).....3A
INTVCC Peak Output Current ................................. 50mA
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
PACKAGE/ORDER INFORMATION
TOP VIEW
ITH1 1
VFB1 2
SENSE1+ 3
SENSE14
PLLLPF 5
PLLIN/MODE 6
SGND 7
RUN1 8
RUN2 9
SENSE210
SENSE2+ 11
VFB2 12
ITH2 13
TRACK/SS2 14
28 TRACK/SS1
27 PGOOD1
26 TG1
25 SW1
24 BOOST1
23 BG1
22 VIN
21 PGND
20 EXTVCC
19 INTVCC
18 BG2
17 BOOST2
16 SW2
15 TG2
G PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3827EG-1#PBF
LTC3827EG-1#TRPBF 3827EG-1
28-Lead Plastic SSOP
LTC3827IG-1#PBF
LTC3827IG-1#TRPBF
3827IG-1
28-Lead Plastic SSOP
LEAD BASED FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3827EG-1
LTC3827EG-1#TR
3827EG-1
28-Lead Plastic SSOP
LTC3827IG-1
LTC3827IG-1#TR
3827IG-1
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
38271fe
2


Part Number LTC3827IG-1
Description 2-Phase Synchronous Step-Down Controller
Maker Linear Technology
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