參數(shù)資料
型號(hào)： LTC3827IG-1#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 3 A DUAL SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO28
封裝： 5.30 MM, PLASTIC, SSOP-28
文件頁(yè)數(shù)： 1/32頁(yè)
文件大?。?/td> 448K
代理商： LTC3827IG-1#TR
LTC3827-1
1
38271fe
TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Low IQ, Dual, 2-Phase
Synchronous Step-Down Controller
The LTC3827-1 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.
High Efciency Dual 8.5V/3.3V Step-Down Converter
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
n Automotive Systems
n Battery-Operated Digital Devices
n Distributed DC Power Systems
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.
Efciency and Power Loss
vs Load Current
+
4.7μF
0.1μF
62.5k
3.3μH
220pF
150μF
1μF
22μF
50V
0.015Ω
20k
15k
VOUT1
3.3V
5A
150μF
0.1μF
192.5k
7.2μH
220pF
0.015Ω
20k
15k
VOUT2
8.5V
3.5A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
SGND
PGND
SENSE1+
SENSE2+
SENSE1–
SENSE2–
VFB1
VFB2
ITH1
ITH2
VIN
INTVCC
TRACK/SS1
TRACK/SS2
VIN
4V TO 36V
38271 TA01
0.1μF
LTC3827-1
LOAD CURRENT (mA)
EFFICIENCY
(%)
POWER
LOSS
(mW)
0.01
0.1
1
10
100
1000 10000
38271 TA01b
0.001
1
10
1000
100
0.1
100000
10000
40
50
60
70
80
30
20
10
0
90
100
POWER LOSS
EFFICIENCY
VIN = 12V; VOUT = 3.3V
FIGURE 13 CIRCUIT
相關(guān)PDF資料
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