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LTC1876 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1876
Description  High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1876 Datasheet(HTML) 1 Page - Linear Technology

 
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LTC1876
1
1876fa
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
High Efficiency, 2-Phase,
Dual Synchronous Step-Down Switching
Controller and Step-Up Regulator
The LTC
®1876 is a high performance triple output switching
regulator. It incorporates a dual step-down switching con-
trollerthatdrivesallN-channelsynchronous 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 VOUT
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.
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 COUT
s
DC Programmed Fixed Frequency 150kHz to 300kHz
s
Wide VIN Range: 3.5V to 36V Operation
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 ModeTM Operation
Step-Up Regulator
s
High Operating Switching Frequency of 1.2MHz
s
Low Internal VCESAT Switch: 400mV @ 1A, VIN = 3V
s
Wide VIN Range: 2.6V to 16V Operation
s
High Output Voltage: Up to 34V
s
3.3V Input Step-Down Converter
s
Notebook and Palmtop Computers, PDAs
s
Battery-Operated Digital Devices
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply
4.7
µF
10V
M4
M3
0.1
µF
63.4k
1%
1000pF
6.3
µH
220pF
1
µF
CER
33
µF
35V
ALUM
10
µF
35V
CER
+
56
µF
4V
SP
0.01
20k
1%
15k
VOUT2
3.3V
5A
M2
M1
0.1
µF
105k
1%
6.8
µH
220pF
1000pF
+
+
+
+
47
µF
6.3V
SP
0.01
20k
1%
10.2k
1%
15k
VOUT1
5V
4A
VOUT3
12V
200mA
TG2
TG1
BOOST2
BOOST1
SW2
SW1
BG2
BG1
PGND
PGOOD
AUXSW
AUXVFB
AUXSD
SENSE2+
SENSE1+
SENSE2
SENSE1
VOSENSE2
VOSENSE1
ITH2
ITH1
AUXVIN
VIN
INTVCC
RUN/SS2
RUN/SS1
VIN
5.2V
TO 28V
M1, M2, M3, M4: FDS6680A
1876 TA01
0.1
µF
0.1
µF
LTC1876
SGND
86.6k, 1%
10
µH
10
µF
20V


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