参数资料
型号: LTC3610EWP#TRPBF
厂商: Linear Technology
文件页数: 14/24页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 12A 64QFN
标准包装: 2,000
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.6 V ~ 24 V
输入电压: 4 V ~ 24 V
PWM 型: 电流模式
电流 - 输出: 12A
同步整流器:
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 64-QFN(9x9)
LTC3610
APPLICATIONS INFORMATION
GND
SW
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
+
V OUT1
V OUT2
C SEC
1μF
+
C OUT
IN4148
T1
1:N
C IN
+
V IN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PGND
PGND
PGND
SW
SW
SW
SW
SW
SW
SW
SW
PV IN
PV IN
PV IN
PV IN
PV IN
LTC3610
SGND
SGND
SGND
SGND
EXTV CC
V FB
SGND
I ON
SGND
FCB
I TH
V RNG
PGOOD
V ON
SGND
SGND
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
R4
OPTIONAL EXTV CC
CONNECTION
5V < V OUT2 < 7V
R3
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
3610 F04
SW
SGND
Figure 4. Secondary Output Loop and EXTV CC  Connection
INTV CC  Regulator and EXTV CC  Connection
An internal P-channel low dropout regulator produces the
5V supply that powers the drivers and internal circuitry
within the LTC3610. The INTV CC pin can supply up to 50mA
RMS and must be bypassed to ground with a minimum of
4.7μF tantalum or ceramic capacitor. Good bypassing is
necessary to supply the high transient currents required
by the MOSFET gate drivers.
The EXTV CC pin can be used to provide MOSFET gate drive
and control power from the output or another external
source during normal operation. Whenever the EXTV CC
pin is above 4.7V the internal 5V regulator is shut off and
an internal 50mA P-channel switch connects the EXTV CC
pin to INTV CC . INTV CC power is supplied from EXTV CC
until this pin drops below 4.5V. Do not apply more than
7V to the EXTV CC pin and ensure that EXTV CC ≤ V IN . The
following list summarizes the possible connections for
EXTV CC :
2. EXTV CC connected to an external supply. A high efficiency
supply compatible with the MOSFET gate drive require-
ments (typically 5V) can improve overall efficiency.
3. EXTV CC connected to an output derived boost network.
The low voltage output can be boosted using a charge
pump or flyback winding to greater than 4.7V. The
system will start-up using the internal linear regulator
until the boosted output supply is available.
Soft-Start and Latchoff with the RUN/SS Pin 
The RUN/SS pin provides a means to shut down the LTC3610
as well as a timer for soft-start and overcurrent latchoff.
Pulling the RUN/SS pin below 0.8V puts the LTC3610 into
a low quiescent current shutdown (I Q < 30μA). Releasing
the pin allows an internal 1.2μA current source to charge
up the external timing capacitor C SS . If RUN/SS has been
pulled all the way to ground, there is a delay before start-
ing of about:
C
1. EXTV CC grounded. INTV CC is always powered from the
internal 5V regulator.
t DELAY =
1.5V
1.2 μ A SS
= ( 1.3s/ μ F ) C SS
3610ff
  
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