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LTC1876EG

Description
DC/DC Cntrlr Triple-OUT Step Down 360kHz Automotive 36-Pin SSOP
File Size413KB,36 Pages
ManufacturerADI
Websitehttps://www.analog.com
Download Datasheet Download user manual Parametric Compare View All

LTC1876EG Overview

DC/DC Cntrlr Triple-OUT Step Down 360kHz Automotive 36-Pin SSOP

LTC1876EG Parametric

Parameter NameAttribute value
EU restricts the use of certain hazardous substancesNot Compliant
ECCN (US)EAR99
Part StatusUnconfirmed
SVHCYes
SVHC Exceeds ThresholdYes
Number of Outputs3
TopologyStep Down
Output Voltage (V)34(Max)
Maximum Switching Frequency (kHz)360
Minimum Input Voltage (V)3.5
Maximum Input Voltage (V)36
Operating Supply Voltage (V)-0.3 to 36
Maximum Supply Current (mA)0.35(Typ)
Control MethodPWM
Minimum Operating Temperature (°C)-40
Maximum Operating Temperature (°C)85
Supplier Temperature GradeExtended
Pin Count36
Standard Package NameSOP
Supplier PackageSSOP
MountingSurface Mount
Package Height2(Max) - 0.05(Min)
Package Length13.1(Max)
Package Width5.6(Max)
PCB changed36
Lead ShapeGull-wing
LTC1876
High Efficiency, 2-Phase,
Dual Synchronous Step-Down Switching
Controller and Step-Up Regulator
DESCRIPTIO
The LTC
®
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 33µF
35V
ALUM
+
10µF
35V
CER
M3
1µF
CER
0.1µF
+
INTV
CC
AUXV
IN
TG2
BOOST2
SW2
LTC1876
V
IN
TG1
BOOST1
SW1
BG1
AUXSW
PGND
PGOOD
AUXV
FB
AUXSD
SENSE1
+
SENSE1
V
OSENSE1
I
TH1
220pF
15k
4.7µF
10V
M1
10µF
20V
0.1µF
6.3µH
M4
BG2
0.01Ω
V
OUT2
3.3V
5A
1000pF
SENSE2
+
SENSE2
V
OSENSE2
I
TH2
220pF
15k
1000pF
+
56µF
4V
SP
63.4k
1%
20k
1%
RUN/SS2 SGND RUN/SS1
0.1µF
0.1µF
10.2k
1%
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply
U
U
U
10µH
V
OUT3
12V
200mA
+
6.8µH
M2
86.6k,
1%
0.01Ω
V
OUT1
5V
4A
105k
1%
20k
1%
M1, M2, M3, M4: FDS6680A
+
47µF
6.3V
SP
1876 TA01
1876fa
1

LTC1876EG Related Products

LTC1876EG LTC1876EG#PBF LTC1876EG#TRPBF
Description DC/DC Cntrlr Triple-OUT Step Down 360kHz Automotive 36-Pin SSOP DC/DC Cntrlr Triple-OUT Step Down 360kHz Automotive 36-Pin SSOP Tube DC/DC Cntrlr Triple-OUT Step Down 360kHz Automotive 36-Pin SSOP T/R
EU restricts the use of certain hazardous substances Not Compliant Compliant Compliant
ECCN (US) EAR99 EAR99 EAR99
Part Status Unconfirmed Active Active
Number of Outputs 3 3 3
Topology Step Down Step Down Step Down
Output Voltage (V) 34(Max) 34(Max) 34(Max)
Maximum Switching Frequency (kHz) 360 360 360
Minimum Input Voltage (V) 3.5 3.5 3.5
Maximum Input Voltage (V) 36 36 36
Operating Supply Voltage (V) -0.3 to 36 -0.3 to 36 -0.3 to 36
Maximum Supply Current (mA) 0.35(Typ) 0.35(Typ) 0.35(Typ)
Control Method PWM PWM PWM
Minimum Operating Temperature (°C) -40 -40 -40
Maximum Operating Temperature (°C) 85 85 85
Supplier Temperature Grade Extended Extended Extended
Pin Count 36 36 36
Standard Package Name SOP SOP SOP
Supplier Package SSOP SSOP SSOP
Mounting Surface Mount Surface Mount Surface Mount
Package Height 2(Max) - 0.05(Min) 2(Max) - 0.05(Min) 2(Max) - 0.05(Min)
Package Length 13.1(Max) 13.1(Max) 13.1(Max)
Package Width 5.6(Max) 5.6(Max) 5.6(Max)
PCB changed 36 36 36
Lead Shape Gull-wing Gull-wing Gull-wing
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