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| 型号： | LTC1700EMS#TR |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 10-MSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 680kHz |
| 占空比： | 92% |
| 电源电压： | 0.9 V ~ 6 V |
| 降压： | 无 |
| 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | LTC1700EMSTR |
LTC1700
No R SENSE Synchronous
Step-Up DC/DC Controller
FEATURES
DESCRIPTIO
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High Efficiency: Up to 95%
No Current Sense Resistor Required
Constant Frequency 530kHz Operation Allows
Small Size, Surface Mount Inductors
OPTI-LOOP ? Compensation Minimizes C OUT
Selectable Burst Mode ? Operation
Minimum Start-Up Voltage as Low as 0.9V
Synchronizable Between 400kHz and 750kHz
Micropower Shutdown: 10 μ A
Current Mode Operation for Excellent Line and Load
Transient Response
Soft-Start Reduces Supply Current Transients
1.5% Output Voltage Accuracy
Uses Low Value, Small Size, Surface Mount Inductors
Available in 10-Lead MSOP Package
The LTC ? 1700 is a current mode synchronous step-up
DC/DC controller that drives external N-channel and
P-channel power MOSFETs using a constant frequency
PWM architecture. Current limiting is provided by sensing
the voltage drop across the main MOSFET, eliminating the
need of a sense resistor. This No R SENSE TM technique helps
the LTC1700 maintain high efficiency at heavy loads while
Burst Mode operation ensures high efficiency at light loads,
thus providing high efficiencies over a wide range of load
currents.
The LTC1700 operates at a minimum input voltage as low as
0.9V. The device boasts a ± 1.5% output voltage accuracy and
consumes only 200 μ A of quiescent current. In shutdown, it
only draws 10 μ A.
APPLICATIO S
To prevent inductor current runaway, the duty cycle is limited
to 90%. Overvoltage protection is also provided which shuts
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Cellular Telephones
Wireless Modems
RF Communications
2.5V to 3.3V, 2.5V to 5V Converters
Battery-Powered Equipment
Telecom/Network Systems
both the external MOSFETs off when tripped.
High constant operating frequency of 530kHz allows the use
of small inductors and output capacitors. The LTC1700 can
also be synchronized between 400kHz to 750kHz. Burst
Mode operation is inhibited when the device is externally
clocked or when the SYNC/MODE pin is pulled low to reduce
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP are registered trademarks of Linear Technology Corporation.
No R SENSE is a trademark of Linear Technology Corporation.
noise and RF interference.
TYPICAL APPLICATIO
2
I TH SW
10
L1
1.8 μ H
C1
22 μ F
M2
+
C2
68 μ F
6.3V
V IN
3.3V to 4.2V
5V
2A
Efficiency, Power Loss vs Load Current
100 1.0
4.2V EFFICIENCY
90
C5
220pF
R2
100k
R3
2200 ?
C3
220pF
R1
316k
4
C4
0.1 μ F
1
3
5
RUN/SS BG
LTC1700
SGND PGND
V FB TG
SYNC/MODE V OUT
8
9
6
7
M1
C6
10 μ F
+
C7
330 μ F
6V
80
70
60
50
40
30
20
3.3V EFFICIENCY
3.3V POWER
4.2V POWER
0.1
0.01
10
C1: CERAMIC TAIYO YUDEN LMK432BJ226MM
C2: AVX TAJB686K006R
L1: TOKO 919AS-IR8N (D104C TYPE)
C6: CERAMIC TAIYO YUDEN JMK316BJ106ML
C7: SANYO POSCAP 6TPB330M
1700 ? F01a
M1: SILICONIX Si9804
M2: SILICONIX Si9803
0
0.001
0.01 0.1
LOAD CURRENT
1
2
0.001
1700 F01b
Figure 1. High Efficiency Step-Up Converter
1700fa
1
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