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參數(shù)資料
| 型號： | LTC1704EGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 347K |
| 描述： | IC REG DL BUCK/LINEAR 16SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 拓?fù)洌?/td> | 降壓（降壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 2 |
| 頻率 - 開關(guān)： | 550kHz |
| 電壓/電流 - 輸出 1： | 控制器 |
| 電壓/電流 - 輸出 2： | 控制器 |
| 帶 LED 驅(qū)動器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)生器： | 無 |
| 電源電壓： | 3.15 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
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LTC1704/LTC1704B
8
1704bfa
PI FU CTIO S
U
U
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礔 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 ?0% 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礔 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礔 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
REGILM
100k
10礔
5V
I
BOOST
+
100pF
1704 TC
I
PVCC
I
VCC
250k
100&
V
FB
f
OSC
2k
1礔
2000pF
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