参数资料
型号: LTC1266IS#TR
厂商: Linear Technology
文件页数: 7/20页
文件大小: 0K
描述: IC REG CTRLR BST PWM CM 16-SOIC
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 400kHz
占空比: 100%
电源电压: 3.5 V ~ 18 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 16-SOIC(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC1266
LTC1266-3.3/LTC1266-5
FU CTIO AL DIAGRA
Pin 10 Connection Shown for LTC1266-3.3 and LTC1266-5; Changes Create LTC1266
LB IN 13
LB
14 LB OUT
V IN
1.25V
REFERENCE
PWR V IN
2
3 PINV
1 TDRIVE
SIGNAL
GROUND
SENSE +
9
SENSE –
8
12
ADJUSTABLE
VERSION
V FB
16 BDRIVE
BINH
4
10
15 PGND
V
SLEEP
S
+
V TH2
V TH1
Q
R
S
C
+ V TRIP
13k
V OS
5pF
T
MAX
ON-TIME
I TH 7
G
1.265V
100k
6
C T
OFF-TIME
CONTROL
V IN
SENSE –
V FB
CONTROL
ENABLE
PINV
SHDN 11
REFERENCE
5 V IN
1266 FD
OPERATIO
The LTC1266 series uses a current mode, constant off-
time architecture to synchronously switch an external pair
of power MOSFETs. Operating frequency is set by an
external capacitor at the timing capacitor Pin 6.
The output voltage is sensed by an internal voltage divider
connected to SENSE – , Pin 8, (LTC1266-3.3 and LTC1266-
5) or external divider returned to V FB , Pin 10, (LTC1266).
A voltage comparator V, and a gain block G, compare the
divided output voltage with a reference voltage of 1.265V.
To optimize efficiency, the LTC1266 automatically switches
between two modes of operation, burst and continuous.
The voltage comparator is the primary control element
when the device is in Burst Mode operation, while the gain
block controls the output voltage in continuous mode.
During the switch ON cycle in continuous mode, current
comparator C monitors the voltage between Pins 8 and 9
connected across an external shunt in series with the
inductor. When the voltage across the shunt reaches its
threshold value, the topside driver output is switched to
turn off the topside MOFSET (Power V IN for P-channel or
ground for N-channel). The timing capacitor connected to
Pin 6 is now allowed to discharge at a rate determined by
the off-time controller. The discharge current is made
proportional to the output voltage (measured by Pin 8) to
model the inductor current, which decays at a rate which
is also proportional to the output voltage. While the timing
capacitor is discharging, the bottom-side drive output is
switched to power V IN to turn on the bottom-side
N-channel MOSFET.
7
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