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参数资料
| 型号： | LTC3785EUF-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM VM 24-QFN |
| 标准包装： | 91 |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 1MHz |
| 占空比： | 99% |
| 电源电压： | 2.7 V ~ 10 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
LTC3785-1
10V, High Ef?ciency,
Buck-Boost Controller
with Power Good
FEATURES
DESCRIPTION
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Single Inductor Architecture Allows V IN Above,
Below or Equal to V OUT
Power Good Output Indicator
2.7V to 10V Input and Output Range
Up to 96% Ef?ciency
Up to 10A of Output Current
All N-channel MOSFETs, No R SENSE ?
True Output Disconnect During Shutdown
Programmable Current Limit and Soft-Start
Optional Short-Circuit Shutdown Timer
Output Overvoltage and Undervoltage Protection
Programmable Frequency: 100kHz to 1MHz
Selectable Burst Mode ? Operation
Available in 24-Lead (4mm × 4mm) Exposed Pad
QFN Package
The LTC ? 3785-1 is a high power synchronous buck-boost
controller that drives all N-channel power MOSFETs from
input voltages above, below and equal to the output volt-
age. With an input range of 2.7V to 10V, the LTC3785-1 is
well suited for a wide variety of single or dual cell Li-Ion
or multicell alkaline/NiMH applications.
The operating frequency can be programmed from 100kHz
to 1MHz. The soft-start time and current limit are also
programmable. The soft-start capacitor doubles as the
fault timer which can program the IC to latch off or recycle
after a determined off time. Burst Mode operation is user
controlled and can be enabled by driving the mode pin
high. The LTC3785-1 includes a power good output that
indicates when the output voltage is within 7.5% of its
designed setpoint.
Palmtop Computers
Handheld Instruments
APPLICATIONS
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Protection features include foldback current limit,
short-circuit and overvoltage protection.
L , LT, LTC ,LTM and Burst Mode are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation. All other trademarks are the
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Wireless Modems
Cellular Telephones
property of their respective owners.
TYPICAL APPLICATION
V OUT
V IN
V CC
4.7μF
V IN
2.7V
TO 10V
100
Ef?ciency vs Input Voltage
V OUT = 3.3V
215k
I SVIN
F OSC = 500kHz
270pF
1.3k
215k
127k
V SENSE
TG1
V BST1
0.22μF
A
22μF
95
I LOAD = 2A
FB
SW1
I LOAD = 1A
127k
1nF
12k
49.9k
V C
RT I SVOUT
I SSW1
V DRV
BG1
LTC3785-1
MODE TG2
B
4.7μH
V OUT
3.3V
5A
90
85
2.5
4
5.5
V IN (V)
7
8.5
10
D
37851 TA01b
PGOOD
RUN/SS
I LSET
V BST2
SW2
I SSW2
0.22μF
100μF
2.2nF
42.2k
CCM
GND
BG2
C
37851 TA01a
37851fa
1
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