参数资料
型号: LTC1702IGN#TRPBF
厂商: Linear Technology
文件页数: 7/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM VM 24-SSOP
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电压模式
输出数: 2
频率 - 最大: 750kHz
占空比: 93%
电源电压: 3 V ~ 7 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: 24-SSOP(0.154",3.90mm 宽)
包装: 带卷 (TR)
LTC1702
TEST CIRCUIT
Test Circuit 1
5V
0.1 μ F
I BOOST1
I CC
I PVCC
I BOOST2
+
100 μ F
V CC
BOOST1
PV CC
BOOST2
f OSC
MEASURED
5V
TG1
BG1
TG2
BG2
10k
C L
C L
SW1
I MAX1
SW2
I MAX2
C L
C L
5V
FCB
LTC1702
10k
V PGOOD1
V FB1
2k
PGOOD1
RUN/SS1
COMP1
FB1
GND
PGOOD2
FAULT
RUN/SS2
COMP2
FB2
PGND
2k
V PGOOD2
V FAULT
V FB2
1702 TC
APPLICATIO N S I N FOR M ATIO N
OVERVIEW
The LTC1702 is a dual, step-down (buck), voltage mode
feedback switching regulator controller. It is designed to
be used in a synchronous switching architecture with two
external N-channel MOSFETs per channel. It is intended to
operate from a low voltage input supply (7V maximum)
and provide a high power, high efficiency, precisely regu-
lated output voltage. Several features make it particularly
suited for microprocessor supply regulation. Output regu-
lation is extremely tight, with DC line and load regulation
and initial accuracy better than 1%, and total regulation
including transient response inside of 3% with a properly
designed circuit. The 550kHz switching frequency allows
the use of physically small, low value external components
without compromising performance.
The LTC1702’s internal feedback amplifier is a 25MHz
gain-bandwidth op amp, allowing the use of complex
multipole/zero compensation networks. This allows the
feedback loop to maintain acceptable phase margin at
higher frequencies than traditional switching regulator
controllers allow, improving stability and maximizing tran-
sient response. The 800mV internal reference allows
regulated output voltages as low as 800mV without exter-
nal level shifting amplifiers.
The LTC1702’s synchronous switching logic transitions
automatically into Burst Mode operation, maximizing effi-
ciency with light loads. Onboard power-good and over-
voltage (OV) fault flags indicate when the output is in
regulation or an OV fault has occurred. The OV flag can be
set to latch the device off when an OV fault has occurred,
or to automatically resume operation when the fault is
removed.
The LTC1702 takes a low input voltage and generates two
lower output voltages at very high currents. Its strengths
are small size, unmatched regulation and transient
response and high efficiency. This combination makes it
ideal for providing multiple low voltage logic supplies to
microprocessors or high density ASICs in systems using
a “2-step” regulation architecture, used in portable and
advanced desktop computers.
1702fa
7
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