參數資料
型號: LTC1704
廠商: Linear Technology Corporation
元件分類: 通用總線功能
英文描述: Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
中文描述: 550kHz的同步開關穩(wěn)壓器控制器加線性穩(wěn)壓控制器
文件頁數: 8/28頁
文件大?。?/td> 343K
代理商: LTC1704
LTC1704/LTC1704B
8
1704bfa
PIU
compensation and soft-start connections should return to
GND. GND and PGND should connect only at a single
point, near the PGND pin and the negative plate of the V
IN
bypass capacitor.
REGFB (Pin 9):
Linear Regulator Controller Feedback
Input. REGFB should be connected through a resistor
divider network to V
OUTREG
to set the output voltage of the
linear regulator.
REGILM (Pin 10):
Linear Regulator Controller Current
Limit Setting cum ON/OFF Control. This pin is internally
servoed to 0.8V. An external resistor R
REGILM
between V
CC
and REGILM programs the REGILM pin input current. This
current determines the maximum pass transistor base
current and directly controls the linear regulator current
sourcing capabilitiy. An external capacitor, C
DELAY
is added
to this pin to control the turn-on time of the linear regula-
tor, the minimum value for this capacitor is 100pF. Refer
to the Linear Regulator Current Limit Programming sec-
tion for more information on choosing R
REGILM
and C
DELAY
.
Pulling REGILM to GND turns off the linear regulator. If
both RUN/SS and REGILM are pulled low, the LTC1704
enters shutdown mode.
V
CC
(Pin 11):
Power Supply Input. All internal circuits
except the switcher output drivers are powered from this
pin. V
CC
should be connected to a low noise 5V supply, and
should be bypassed to GND with at least a 10
μ
F capacitor
in close proximity to the LTC1704.
PGOOD (Pin 12):
Power Good. PGOOD is an open-drain
logic output. PGOOD pulls low if any of the two supply
outputs are outside
±
10% of their nominal levels. An
external pull-up resistor is required at PGOOD to allow it
to swing positive.
PGND (Pin 13):
Power Ground. The BG driver returns to
this pin. Connect PGND to a high current ground node in
close proximity to the sources of external MOSFET QB,
and the V
IN
and V
OUTSW
bypass capacitors.
BG (Pin 14):
Switcher Controller Bottom Gate Drive. The
BG pin drives the gate of the bottom N-channel synchro-
nous switch MOSFET, QB. BG is designed to typically drive
up to 10,000pF of gate capacitance.
PV
CC
(Pin 15):
Switcher Controller Bottom Gate Driver Sup-
ply. PV
CC
provides power to the BG output driver. PV
CC
must be connected to a voltage high enough to fully turn
on the external MOSFET, QB. PV
CC
should generally be con-
nected directly to V
IN
, the main system 5V supply. PV
CC
requires at least a 10
μ
F bypass capacitor directly to PGND.
BOOST (Pin 16):
Switcher Controller Top Gate Driver
Supply. The BOOST pin supplies power to the floating TG
driver. Bypass BOOST to SW with a 1
μ
F capacitor. An
external Schottky diode from V
IN
to BOOST creates a
complete floating charge-pumped supply at BOOST. No
other external supplies are required.
TEST CIRCUIT
TG
SW
I
MAX
RUN/SS
COMP
FB
REGDR
GND
BOOST
PV
CC
BG
PGND
PGOOD
V
CC
REGILM
REGFB
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
LTC1704
2000pF
80k
R
100k
10
μ
F
5V
I
BOOST
+
100pF
1704 TC
I
PVCC
I
VCC
250k
100
V
FB
f
OSC
2k
1
μ
F
2000pF
相關PDF資料
PDF描述
LTC1704B Synchronous 8-Bit Up/Down Binary Counters 24-SOIC 0 to 70
LTC1705 Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
LTC1705EGN Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
LTC1710 Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
LTC1710C Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
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