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LTC3828EUH Datasheet

  • LTC3828EUH

  • Dual 2-Phase Step-Down Controller with Tracking

  • 32頁

  • LINER

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FEATURES
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LTC3828
Dual, 2-Phase Step-Down
Controller with Tracking
DESCRIPTIO
The LTC
廬
3828 is a dual high performance step-down
switching regulator controller that drives all N-channel
synchronous power MOSFET stages. A constant fre-
quency current mode architecture allows for a phase-
lockable frequency of up to 550kHz. The TRCKSS pin
provides both soft-start and tracking functions. Multiple
LTC3828s can be daisy-chained in applications requiring
more than two voltages to be tracked.
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 a wide 4.5V to 28V
(30V maximum) input supply range, encompassing all bat-
tery chemistries.
The RUN pins control their respective channels indepen-
dently. The FCB/PLLIN pin selects among Burst Mode
廬
operation, skip-cycle mode and continuous current mode.
Current foldback limits MOSFET dissipation during short-
circuit conditions. Reverse current and current foldback
functions are disabled during soft-start.
, LTC and LT are registered trademarks of Linear Technology Corporation.
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
Dual, 180擄 Phased Controllers Reduce Required
Input Capacitance and Power Supply Induced Noise
Tracking for Both Outputs
Constant Frequency Current Mode Control
Wide V
IN
Range: 4.5V to 28V Operation
Power Good Output Voltage Indicator
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting鈥?/div>
Disabled at Start-Up
No Reverse Current During Soft-Start Interval
Clock Output for 3-, 4-, 6-Phase Operation
Dual N-Channel MOSFET Synchronous Drive
鹵1%
Output Voltage Accuracy
Phase-Lockable Fixed Frequency 260kHz to 550kHz
OPTI-LOOP
廬
Compensation Minimizes C
OUT
Very Low Dropout Operation: 99% Duty Cycle
Output Overvoltage Protection
Small 28-Lead SSOP and 5mm
脳
5mm QFN
Packages
APPLICATIO S
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Telecom Infrastructure
ASIC Power Supply
Industry Equipment
TYPICAL APPLICATIO
High Efficiency Dual 2.5V/3.3V Step-Down Converter with Tracking
+
4.7碌F
V
IN
PGOOD INTV
CC
TG1
3.2碌H
BOOST1
0.1碌F
SW1
BG1
500kHz
LTC3828
TG2
BOOST2
SW2
BG2
PGND
SENSE2
+
1000pF
SENSE1
V
OSENSE1
63.4k 1%
63.4k 1%
20k
20k
1%
1%
0.1碌F
TRCKSS2
I
TH1
220pF
15k
RUN1
SGND
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1碌F
CERAMIC
0.1碌F
FCB/PLLIN
SENSE1
+
0.01鈩?/div>
1000pF
SENSE2
V
OSENSE2
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3.3V
5A
TRCKSS1
I
TH2
RUN2
220pF
15k
TRCKSS1
20k
1%
0.1碌F
+
47碌F
4V
SP
U
U
U
4.5V TO 28V
22碌F
50V
CERAMIC
3.2碌H
0.01鈩?/div>
42.5k
1%
2.5V
5A
56碌F
4V
SP
+
3828 TA01
3828f
1

LTC3828EUH 產(chǎn)品屬性

  • 0現(xiàn)貨

  • 停產(chǎn)

  • -

  • 管件

  • 停產(chǎn)

  • 晶體管驅(qū)動(dòng)器

  • 降壓

  • 正

  • 2

  • 2

  • 4.5V ~ 28V

  • 260kHz ~ 550kHz

  • 0.994

  • 是

  • 無

  • -

  • 使能，相位控制，電源良好，跟蹤

  • -40°C ~ 85°C（TA）

  • 表面貼裝型

  • 32-WFQFN 裸露焊盤

  • 32-QFN（5x5）

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