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LTC1708-PG Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC1708-PG
Description  Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck Regulator Controller
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC1708-PG Datasheet(HTML) 1 Page - Linear Technology

 
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LTC1708-PG
Dual Adjustable 5-Bit VID
High Efficiency, 2-Phase Current Mode
Synchronous Buck Regulator Controller
February 2000
Figure 1. High Efficiency VID Controlled, 2-Output Step-Down Converter
s
Out-of-Phase Controllers Reduce Input Capacitance
and Power Supply Induced Noise
s
OPTI-LOOP
TM Compensation Minimizes COUT
s
Power Good Output Monitors Both Outputs
s
5-Bit Mobile VID Control, VOUT: 0.9V to 2.0V
s
Dual N-Channel MOSFET Synchronous Drive
s
±1% Output Voltage Accuracy
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
Foldback Output Current Limiting
s
Latched Short-Circuit Shutdown with Defeat Option
s
Output Overvoltage Protection
s
Remote Output Voltage Sense
s
Low Shutdown Current: 20
µA
s
5V and 3.3V Standby Regulators
s
Selectable Constant Frequency, Burst Mode
TM and
Continuous Operation
The LTC
®1708 is a dual adjustable 5-bit VID program-
mable step-down switching regulator controller that drives
all N-Channel power MOSFET stages. A constant fre-
quency current mode architecture allows adjustment of
the frequency up to 300kHz. Power loss and noise due to
the ESR of the input capacitance are minimized by oper-
ating the two main controller output stages out of phase.
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 is compat-
ible with future microprocessor generations, and a wide
3.5V to 30V (36V maximum) input supply range that
encompasses all battery chemistries. A power good out-
put indicates when the output voltages are within 7.5% of
their programmed value.
A RUN/SS pin for each controller provides both soft-start
and an optional timed, short-circuit shutdown. Other
protection features include: internal foldback current lim-
iting and an output overvoltage crowbar. The force con-
tinuous control pin (FCB) can be used to inhibit Burst
Mode operation or to regulate a third, flyback output.
s
Notebook and Palmtop Computers, PDAs
s
Portable Instruments
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
+
4.7
µF
D3
D4
D1
M2
5 VID BITS
M1
CB1 0.47µF
1000pF
L1
1
µH
CC1
1500pF
1
µF
CERAMIC
CIN
10
µF
50V
CERAMIC
×4
COUT1
270
µF
2V
SP
×4
COUT1a
10
µF
6.3V
CERAMIC
RSENSE1
0.003
RC1
22k
VOUT1
0.925V TO
2.00V
14.1A
D2
M3b
M3a
CB2 0.1µF
R4
63.4k
1%
L2
2.2
µH
CC2
220pF
1000pF
+
COUT
180
µF
4V
SP
RSENSE2
0.01
R3
20k
1%
RC2
15k
VOUT2
1.5V
4A
TG1
TG2
BOOST1
BOOST2
SW1
SW2
BG1
BG2
VID0 TO VID4
PGND
SENSE1+
SENSE2+
SENSE1
SENSE2
PGOOD
ATTNIN
VOSENSE2
ITH1
ITH2
VIN
VIDVCC INTVCC
RUN/SS1
RUN/SS2
SGND
VIN
4.75V TO 28V
M1: IRF7811
M2: 1RF7809
M3a, M3b: FDS6982
L1: VISHAY 5050CE
ATTNOUT CONNECTED TO EAIN1
1628 F01
CSS1
0.1
µF
CSS2
0.1
µF
LTC1708-PG
+
DESCRIPTIO
FEATURES
APPLICATIO S
TYPICAL APPLICATIO
Final Electrical Specifications
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.


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