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LTC1439CG 数据表(PDF) 9 Page - Linear Technology

部件名 LTC1439CG
功能描述  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
PDF  32 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1439CG 数据表(HTML) 9 Page - Linear Technology

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9
LTC1438/LTC1439
PIN FUNCTIONS
12V operation. When used as a comparator, this is the
noninverting input of a comparator whose inverting input
is tied to the internal 1.19V reference. See Auxiliary Regu-
lator Application section.
AUXON: Pulling this pin high turns on the auxiliary regu-
lator/comparator. The threshold is 1.19V. This is a conve-
nient linear power supply logic-controlled on/off input.
AUXDR: Open Drain Output of the Auxiliary Regulator/
Comparator. The base of an external PNP device is con-
nected to this pin when used as a linear regulator. An
external pull-up resistor is required for use as a compara-
tor. A voltage > 9.5V on AUXDR causes the internal 12V
resistive divider to be connected in series with the AUXFB pin.
FUNCTIONAL DIAGRA
PHASE
DETECTOR
OSCILLATOR
50k
PLLIN**
PLL LPF**
POWER-ON
RESET
POR2
LBI
RLP
VFB2
1.11V
CLP
COSC
COSC
fIN
BATTERY
SENSE
9V
0.6V
SFB
DROPOUT
DETECTOR
DUPLICATE FOR SECOND CONTROLLER CHANNEL
SWITCH
LOGIC
10k
LBO
AUXDR**
AUXFB**
SFB1*
SFB
1
µA
AUXON**
VLDO
VIN
4.8V
VIN
EXTVCC
INTVCC
VREF
VFB
VSEC
–
+
–
+
–
+
–
+
–
+
90.8k
+
3
µA
6V
1.19V
REF
5V LDO
REGULATOR
RUN
SOFT START
INTERNAL
SUPPLY
SGND
*IN SOME VERSIONS, NOT AVAILABLE ON BOTH CHANNELS
**NOT AVAILABLE ON LTC1438
†FOLDBACK CURRENT LIMITING OPTION
1438 FD
S
R
Q
Q
+
–
–
+
–
+
SHUTDOWN
INTVCC
INTVCC
VIN
I1
I2
BOOST
SENSE +
VOSENSE*
VOUT
ITH
VPROG*
CC
CSS
RC
RUN/SS
SENSE–
PGND
BG
SW
TGS**
TGL
8k
4k
320k
61k
119k
30k
EA
180k
1.28V
1.19V
SHUTDOWN
0V
CIN
CB
DB
RSENSE
COUT
•
•
CSEC
+
INTVCC
+
BOLD LINES INDICATE HIGH CURRENT PATHS
2.4V
DFB
†
gm = 1m



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