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参数资料
| 型号： | LTC3459EDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST SYNC ADJ 6DFN |
| 标准包装： | 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： | 6-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x2） |
LTC3459
OPERATION
I PEAK LIMIT + ( 100 ns ) IN
= I
Operation
The LTC3459 synchronous boost converter utilizes a
Burst Mode control technique to achieve high ef?ciency
over a wide dynamic range. A 2.5% accurate comparator
is used to monitor the output voltage (V OUT ), if V OUT is
above the comparator threshold, no switching occurs and
only quiescent current (10μA) is drawn from the power
source. When V OUT drops below the comparator threshold,
switching commences and the output capacitor is charged.
During the on time of the switching period, inductor cur-
rent is ramped through an internal N-channel MOSFET to
GND until a peak current (75mA) is detected. A P-channel
MOSFET connects the inductor to V OUT during the off time
delivering energy to the load. The off time is controlled by
an internal timer which is proportional to 1/(V OUT – V IN ).
Anticross conduction circuitry ensures the N- and P-chan-
nel switches are never on simultaneously.
Only three power components and two feedback resistors
are required to complete the design of the boost converter,
an external Schottky diode is not required. The high op-
erating frequency allows the use of low value, low pro?le
inductors and tiny external ceramic capacitors. The boost
converter disconnects V OUT from V IN during shutdown to
avoid loading the input power source.
Peak Current Overshoot
The LTC3459’s peak current comparator has a delay of ap-
proximately 100ns from the time inductor current reaches
current limit until the internal N-channel MOSFET turns off.
This delay causes the peak current to overshoot based on
the inductor value and V IN , as follows (Figure 2 is based
on a 65mA initial I LIMIT ).
V
L
t OFF Timer
The LTC3459’s t OFF timer is designed to keep the inductor
current continuous during a Burst Mode switching packet,
thereby increasing current capability at the output. A larger
inductor value will have lower peak-to-peak current ripple,
increasing the available current to the load. This improve-
ment is offset somewhat by the reduced I PEAK overshoot.
The t OFF timer is designed to maintain a relatively constant
peak-to-peak current in the inductor despite V IN changes.
~50mV P-P
V OUT
AC
RIPPLE
I PEAK
t OFF
t OFF
t OFF
~100mA
t OFF
N
P
N
P
N
P
N
P
N
P
N
BURST ON
I ZERO WAIT
SLEEP
BURST ON
3459 F01
Figure 1. Inductor Current and V OUT Ripple Waveforms
110
100
15μH
0.8
0.7
0.6
90
80
70
60
22μH
33μH
0.5
0.4
0.3
0.2
0.1
50
1.5
2
2.5
3
3.5
4
4.5
5
5.5
0
0.5 1.5
2.5
3.5 4.5
5.5
6.5
7.5
8.5
V IN (V)
3459 F02
V OUT – V IN (V)
3459 F03
Figure 2. Typical I PEAK Values
Figure 3. t OFF Times
3459fc
7
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| LTC3459ES6#TR | 功能描述:IC REG BOOST SYNC ADJ SOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3459ES6#TRM | 功能描述:IC REG BOOST SYNC ADJ SOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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