参数资料
| 型号： | LT3436EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 3A 16TSSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.2 V ~ 34 V |
| 输入电压： | 3 V ~ 25 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 800kHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-TSSOP-EP |
LT3436
APPLICATIO N S I N FOR M ATIO N
CATCH DIODE
The suggested catch diode (D1) is a B220A Schottky. It is
rated at 2A average forward current and 20V reverse
voltage. Typical forward voltage is 0.5V at 2A. The diode
conducts current only during switch off time. Peak reverse
voltage is equal to regulator output voltage. Average
shutdown pin can be used. The threshold voltage of the
shutdown pin comparator is 1.35V. A 3 μ A internal current
source defaults the open pin condition to be operating (see
Typical Performance Graphs). Current hysteresis is added
above the SHDN threshold. This can be used to set voltage
hysteresis of the UVLO using the following:
forward current in normal operation is equal to output
current.
SHUTDOWN AND UNDERVOLTAGE LOCKOUT
Figure 4 shows how to add undervoltage lockout (UVLO)
to the LT3436. Typically, UVLO is used in situations where
R 1 =
R 2 =
V H ? V L
7 μ A
1 . 35 V
( V H ? 1.35V ) + 3 μ A
R 1
the input supply is current limited, or has a relatively high
source resistance. A switching regulator draws constant
power from the source, so source current increases as
source voltage drops. This looks like a negative resistance
load to the source and can cause the source to current limit
or latch low under low source voltage conditions. UVLO
prevents the regulator from operating at source voltages
where these problems might occur.
V H – Turn-on threshold
V L – Turn-off threshold
Example: switching should not start until the input is
above 4.75V and is to stop if the input falls below 3.75V.
V H = 4.75V
V L = 3.75V
INPUT
LT3436
IN
7 μ A
R 1 =
4 .75V ? 3 .75V
7 μ A
= 143 k
R1
SHDN
3 μ A
1.35V
V CC
R 2 =
1 . 35 V
( 4 .75V ? 1 .35V ) + 3 μ A
143 k
= 50 . 4 k
C1
R2
GND
3436 F04
Keep the connections from the resistors to the SHDN pin
short and make sure that the interplane or surface capaci-
Figure 4. Undervoltage Lockout
An internal comparator will force the part into shutdown
below the minimum V IN of 2.6V. This feature can be used
tance to the switching nodes are minimized. If high resis-
tor values are used, the SHDN pin should be bypassed with
a 1nF capacitor to prevent coupling problems from the
switch node.
to prevent excessive discharge of battery-operated sys-
tems. If an adjustable UVLO threshold is required, the
3436fa
8
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