LTC1876 LINER [Linear Technology], LTC1876 Datasheet
LTC1876
Manufacturer Part Number
LTC1876
Description
High Efficiency, 2-Phase, Dual Synchronous Step-Down Switching Controller and Step-Up Regulator
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC1876.pdf
(36 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC1876EG
Manufacturer:
Linear Technology
Quantity:
135
FEATURES
Step-Down Controller
Step-Up Regulator
APPLICATIO S
TYPICAL APPLICATIO
Out-of-Phase Controllers Reduce Required Input
Capacitance and Power Supply Induced Noise
Power Good Output Voltage Indicator
OPTI-LOOP
DC Programmed Fixed Frequency 150kHz to 300kHz
Wide V
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Latched Short-Circuit Shutdown with Defeat Option
Remote Output Voltage Sense and OV Protection
5V and 3.3V Standby Regulators
Selectable Const. Freq. or Burst Mode
High Operating Switching Frequency of 1.2MHz
Low Internal V
Wide V
High Output Voltage: Up to 34V
3.3V Input Step-Down Converter
Notebook and Palmtop Computers, PDAs
Battery-Operated Digital Devices
IN
IN
Range: 3.5V to 36V Operation
Range: 2.6V to 16V Operation
TO 28V
V
5.2V
OUT2
3.3V
TM
V
5A
IN
0.01
ALUM
Compensation Minimizes C
33 F
35V
CESAT
+
U
56 F
4V
SP
+
6.3 H
Switch: 400mV @ 1A, V
10 F
CER
35V
63.4k
1%
Figure 1. High Efficiency Triple 5V/3.3V/12V Power Supply
Dual Synchronous Step-Down Switching
M3
M4
U
20k
1%
1000pF
TM
0.1 F
1 F
CER
15k
220pF
Operation
OUT
Controller and Step-Up Regulator
IN
0.1 F
= 3V
RUN/SS2
TG2
BOOST2
SW2
BG2
PGND
PGOOD
SENSE2
SENSE2
V
I
INTV
TH2
OSENSE2
CC
+
–
LTC1876
AUXV
SGND
IN
V
SENSE1
SENSE1
RUN/SS1
AUXSW
BOOST1
DESCRIPTIO
OSENSE1
AUXV
The LTC
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
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.
AUXSD
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
V
SW1
IN
BG1
I
TG1
TH1
, LTC and LT are registered trademarks of Linear Technology Corporation.
FB
+
–
0.1 F
High Efficiency, 2-Phase,
®
220pF
1876 is a high performance triple output switching
15k
0.1 F
+
1000pF
4.7 F
10V
10.2k
1%
U
86.6k,
M1
M2
M1, M2, M3, M4: FDS6680A
20k
1%
1%
105k
1%
6.8 H
10 H
10 F
20V
+
+
0.01
1876 TA01
47 F
6.3V
SP
LTC1876
V
12V
200mA
OUT3
V
5V
4A
OUT1
1876fa
1
OUT
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