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参数资料
| 型号： | LTC3459ES6#TR |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ SOT23-6 |
| 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： | 2.5 V ~ 10 V |
| 输入电压： | 1.5 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-6 |
LTC3459
PIN FUNCTIONS
(DC/DCB/S6 Packages)
V IN (Pin 1/Pin 6/Pin 6): Input Supply Pin. Bypass V IN with
a low ESR, ESL ceramic capacitor of at least 1μF.
V OUT (Pin 2/Pin 2/Pin 5): Regulated Output Voltage of
the Boost Regulator. Bypass V OUT with a low ESR, ESL
ceramic capacitor between 2.2μF and 10μF. V OUT ripple
increases with smaller capacitors.
SHDN (Pin 3/Pin 1/Pin 4): Master Shutdown Input. Driving
SHDN low disables all IC functions and reduces quiescent
current from the battery to less than 1μA. This pin must
be pulled above 1V to enable the IC.
FB (Pin 4/Pin 3/Pin 3): Input to the Burst Mode Comparator.
An external resistor divider connected between V OUT ,
GND and this pin sets the output voltage to:
V OUT = 1.22(1 + R1/R2)
BLOCK DIAGRAM
GND (Pin 5/Pin 5/Pin 2): Signal and Power Ground. Provide
a short, direct PCB path between GND and the (–) side of
the ?lter capacitors on V IN and V OUT .
SW (Pin 6/Pin 4/Pin 1): Switch Pin. Connect a 15μH to
33μH inductor between SW and V IN . Keep PCB trace lengths
as short and wide as possible to reduce EMI and voltage
overshoot. If the inductor current falls to zero, the internal
P-channel MOSFET synchronous recti?er is turned off to
prevent reverse charging of the inductor.
Exposed Pad (Pin 7/Pin 7, DC and DCB Packages Only):
Ground. The Exposed Pad must be soldered to PCB.
V CC
SW
V IN
V OUT
t OFF
TIMER
Q SD
t OFF
I PEAK
V SELECT
QB R
I ZO
I ZERO
V BEST SW1
DETECT
Q
S
P/~N
QB RD
THERMAL
SLEEP
V OUT
I ZO
S
Q
V SELECT
SD
DELAY
P-DRIVE
RD QB
FB
R1
V CC
I PEAK
V BEST
HYSTCOMP
R2
DETECT
V CC
N-DRIVE
SDB
N-DRIVE
REFOK
REFERENCE
P-DRIVE
SD
GND
SHDN
SD
SDB
3459 BD
OFF ON
3459fc
6
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