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LTC1876EG Datasheet

  • LTC1876EG

  • High Efficiency, 2-Phase, Dual Synchronous Step-Down Switchi...

  • 417.15KB

  • 36頁(yè)

  • LINER

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LTC1876
High Efficiency, 2-Phase,
Dual Synchronous Step-Down Switching
Controller and Step-Up Regulator
DESCRIPTIO
The LTC
廬
1876 is a high performance triple output switching
regulator. It incorporates a dual step-down switching con-
troller that drives all N-channel synchronous power MOSFET
stages. A step-up regulator with an internal 1A, 36V switch
provides the third output.
The step-down controllers minimize power loss and noise
by operating the output stage of each controller out of
phase. OPTI-LOOP compensation allows the transient
response to be optimized over a wide range of output
capacitance and ESR values. A RUN/SS pin for each
controller provides both soft-start and an optional timed,
short-circuit shutdown that can be configured to latch off
one or both controllers. Current foldback provides
additional short-circuit protection. In an overvoltage
condition, the bottom MOSFET is latched on until V
OUT
returns to normal. The FCB pin can be used to inhibit Burst
Mode operation or to enable regulation of a secondary
output voltage.
The step-up regulator operates at 1.2MHz, allowing the
use of tiny low cost capacitors and inductors. In addition,
its internal 1A switch allows high current outputs to be
generated. Its current mode control scheme provides
excellent line and load regulation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
FEATURES
Step-Down Controller
s
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
s
Power Good Output Voltage Indicator
s
OPTI-LOOP
TM
Compensation Minimizes C
OUT
s
DC Programmed Fixed Frequency 150kHz to 300kHz
s
Wide V Range: 3.5V to 36V Operation
IN
s
Very Low Dropout Operation: 99% Duty Cycle
s
Adjustable Soft-Start Current Ramping
s
Latched Short-Circuit Shutdown with Defeat Option
s
Remote Output Voltage Sense and OV Protection
s
5V and 3.3V Standby Regulators
s
Selectable Const. Freq. or Burst Mode
TM
Operation
Step-Up Regulator
s
High Operating Switching Frequency of 1.2MHz
s
Low Internal V
CESAT
Switch: 400mV @ 1A, V
IN
= 3V
s
Wide V Range: 2.6V to 16V Operation
IN
s
High Output Voltage: Up to 34V
APPLICATIO S
s
s
s
3.3V Input Step-Down Converter
Notebook and Palmtop Computers, PDAs
Battery-Operated Digital Devices
TYPICAL APPLICATIO
V
IN
5.2V
TO 28V 33碌F
35V
ALUM
+
10碌F
35V
CER
M3
1碌F
CER
0.1碌F
+
INTV
CC
AUXV
IN
TG2
BOOST2
SW2
LTC1876
V
IN
TG1
BOOST1
SW1
BG1
AUXSW
PGND
PGOOD
AUXV
FB
AUXSD
SENSE1
+
SENSE1
鈥?/div>
V
OSENSE1
I
TH1
220pF
15k
4.7碌F
10V
M1
10碌F
20V
0.1碌F
6.3碌H
M4
BG2
0.01鈩?/div>
V
OUT2
3.3V
5A
1000pF
SENSE2
+
SENSE2
鈥?/div>
V
OSENSE2
I
TH2
220pF
15k
1000pF
+
56碌F
4V
SP
63.4k
1%
20k
1%
RUN/SS2 SGND RUN/SS1
0.1碌F
0.1碌F
10.2k
1%
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply
U
U
U
10碌H
V
OUT3
12V
200mA
+
6.8碌H
M2
86.6k,
1%
0.01鈩?/div>
V
OUT1
5V
4A
105k
1%
20k
1%
M1, M2, M3, M4: FDS6680A
+
47碌F
6.3V
SP
1876 TA01
1876fa
1

LTC1876EG 產(chǎn)品屬性

  • LTC1876

  • 37

  • 集成電路 (IC)

  • PMIC - 穩(wěn)壓器 - DC DC 切換控制器

  • PolyPhase®

  • 電流模式

  • 3

  • 360kHz

  • 99.4%

  • 3.5 V ~ 36 V

  • 是

  • 是

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • 無(wú)

  • -40°C ~ 85°C

  • 36-SSOP（0.209"，5.30mm 寬）

  • 管件

LTC1876EG相關(guān)型號(hào)PDF文件下載

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