参数资料
型号: LTC1436ACGN-PLL#TRPBF
厂商: Linear Technology
文件页数: 7/28页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-SSOP
标准包装: 2,500
PWM 型: 电流模式
输出数: 1
频率 - 最大: 138kHz
占空比: 99%
电源电压: 3.5 V ~ 30 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: 0°C ~ 70°C
封装/外壳: 24-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC1436A
LTC1436A-PLL/LTC1437A
TYPICAL PERFOR M A N CE CHARACTERISTICS
Auxiliary Regulator
Efficiency and Power Loss vs
Sink Current Available
Auxiliary Regulator PSRR
Load Current
20
70
60
10mA LOAD
100
95
90
V IN = 10V
V OUT = 5V
R SENSE = 0.033 ?
100
10
15
50
85
10
5
40
30
100mA LOA D
80
75
70
65
EFFICIENCY
POWER LOSS
1
0.1
20
60
55
0.01
0
0
2
4
6 8
10 12
14
16
10
10
100
1000
50
0.001
0.01 0.1
1
0.001
10
AUX DR VOLTAGE (V)
PI N FU N CTIO N S
1436 G19
FREQUENCY (kHz)
1436 G20
LOAD CURRENT (A)
1436 G21
V IN : Main Supply Pin. Must be closely decoupled to the
IC’s signal ground pin.
INTV CC : Output of the Internal 5V Regulator and EXTV CC
Switch. The driver and control circuits are powered from
this voltage. Must be closely decoupled to power ground
with a minimum of 2.2 μ F tantalum or electrolytic capacitor.
DRV CC : Bottom MOSFET Driver Supply Voltage.
EXTV CC : Input to the Internal Switch Connected to INTV CC .
This switch closes and supplies V CC power whenever
EXTV CC is higher than 4.7V. See EXTV CC connection in
Applications Information section. Do not exceed 10V on
this pin. Connect to V OUT if V OUT ≥ 5V.
BOOST: Supply to Topside Floating Driver. The bootstrap
capacitor is returned to this pin. Voltage swing at this pin
is from INTV CC to V IN + INTV CC .
SW: Switch Node Connection to Inductor. Voltage swing
at this pin is from a Schottky diode (external) voltage drop
below ground to V IN .
SGND: Small Signal Ground. Must be routed separately
from other grounds to the (–) terminal of C OUT .
PGND: Driver Power Ground. Connects to source of
bottom N-channel MOSFET and the (–) terminal of C IN .
SENSE – : The (–) Input to the Current Comparator.
SENSE + : The (+) Input to the Current Comparator. Built-
in offsets between SENSE – and SENSE + pins in conjunction
with R SENSE set the current trip thresholds.
V OSENSE : Receives the remotely sensed feedback voltage
either from the output or from an external resistive divider
across the output . The V PROG pin determines which point
V OSENSE must connect to.
V PROG : This voltage selects the output voltage. For V PROG
< V INTVCC /3 the output is set to 3.3V with V OSENSE
connected to the output. With V PROG > V INTVCC /1.5 the
output is set to 5V with V OSENSE connected to the output.
Leaving V PROG open (DC) allows the output voltage to be
set by an external resistive divider connected to V OSENSE .
C OSC : External capacitor C OSC from this pin to ground sets
the operating frequency.
I TH : Error Amplifier Compensation Point. The current
comparator threshold increases with this control voltage.
Nominal voltage range for this pin is 0V to 2.5V.
RUN/SS: Combination of Soft Start and Run Control
Inputs. A capacitor to ground at this pin sets the ramp time
to full current output. The time is approximately 0.5s/ μ F.
14367afb
7
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