参数资料
型号: LTC1909-8EG#TRPBF
厂商: Linear Technology
文件页数: 10/32页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 28-SSOP
标准包装: 2,000
PWM 型: 电流模式
输出数: 1
频率 - 最大: 200kHz
占空比: 90%
电源电压: 4 V ~ 36 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: 28-SSOP(0.209",5.30mm 宽)
包装: 带卷 (TR)
LTC1909-8
PI FU CTIO S
FB (Pin 17): Feedback Input. Center tap of the SMBus
programmable divider that is connected to Pin 9.
GND (Pin 18): SMBus Programmer Ground. Connect to
regulator signal ground at Pin 7.
V CC (Pin 19): Positive Supply of the SMBus VID Program-
mer. 2.7V ≤ V CC ≤ 5.5V. May be connected to the INTV CC
pin. Bypass this pin to ground with a 0.1 μ F ceramic
capacitor if using an external supply.
EXTV CC (Pin 20): External V CC Input. When EXTV CC ex-
ceeds 4.7V, an internal switch connects this pin to INTV CC
and shuts down the internal regulator so that controller
and gate drive power is drawn from EXTV CC . Do not exceed
7V at this pin and ensure that EXTV CC < V IN .
V IN (Pin 21): Main Input Supply. Decouple this pin to
PGND with an RC filter (1 ? , 0.1 μ F).
INTV CC (Pin 22): Internal 5V Regulator Output. The driver
and control circuits are powered from this voltage. De-
couple this pin to power ground with a minimum of 4.7 μ F
low ESR tantalum or other low ESR capacitor. The internal
BG (Pin 23): Bottom Gate Drive. Drives the gate of the
bottom N-channel MOSFET between ground and INTV CC .
PGND (Pin 24): Power Ground. Connect this pin closely to
the source of the bottom N-channel MOSFET, the (–)
terminal of C VCC and the (–) terminal of C IN .
SENSE + (Pin 25): Current Sense Comparator Input. The
(+) input to the current comparator is normally connected
to the SW pin unless using a sense resistor (see Applica-
tions Information).
SW (Pin 26): Switch Node. The (–) terminal of the boot-
strap capacitor C B connects here. This pin swings from a
diode voltage drop below ground up to V IN .
TG (Pin 27): Top Gate Drive. Drives the top N-channel
MOSFET with a voltage swing equal to INTV CC superim-
posed on the switch node voltage SW.
BOOST (Pin 28): Boosted Floating Driver Supply. The (+)
terminal of the bootstrap capacitor C B connects here. This
pin swings from a diode voltage drop below INTV CC up to
V IN + INTV CC .
5V regulator is shut down when V RUN/SS <1.5V.
TEST CIRCUIT
SMBus VID Programmer Test Circuit
5V
10k
S1
0.1 μ F
V CC
V CC
CPUON OR
SCL
SCL
PGTMR
S2
100pF
SDA
SDA
SEL
VRON
SEL
VRON
GND
FB
V OSENSE
0.8V
+
19098 TC
19098f
10
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