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參數(shù)資料
| 型號(hào)： | ISL97644IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Boost + LDO + VON Slice + VCOM |
| 中文描述： | 0.4 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, PLASTIC, QFN-24 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 544K |
| 代理商： | ISL97644IRZ |
10
FN9228.0
April 11, 2006
Operation
The boost converter is a current mode PWM converter
operating at either a 650kHz or 1.2MHz. It can operate in
both discontinuous conduction mode (DCM) at light load and
continuous mode (CCM). In continuous current mode,
current flows continuously in the inductor during the entire
switching cycle in steady state operation. The voltage
conversion ratio in continuous current mode is given by:
Where D is the duty cycle of the switching MOSFET.
Figure 13 shows the block diagram of the boost regulator. It
uses a summing amplifier architecture consisting of gm
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 60k
is recommended.
The boost converter output voltage is determined by the
following equation:
The current through the MOSFET is limited to 2.6A
PEAK
.
This restricts the maximum output current (average) based
on the following equation:
Where
I
L
is peak to peak inductor ripple current, and is set
by:
where f
S
is the switching frequency (650kHz or 1.2MHz).
The Table 2 gives typical values (margins are considered
10%, 3%, 20%, 10% and 15% on V
IN
, V
O
, L, f
S
and I
OMAX
).
Capacitor
An input capacitor is used to suppress the voltage ripple
injected into the boost converter. The ceramic capacitor with
capacitance larger than 10μF is recommended. The voltage
rating of input capacitor should be larger than the maximum
input voltage. Some capacitors are recommended in Table 1
for input capacitor.
V
V
IN
------------------
–
1
D
-------------
=
V
Boost
R
--------------------
R
2
+
2
V
FB
×
=
TABLE 1. BOOST CONVERTER INPUT CAPACITOR
RECOMMENDATION
CAPACITOR
SIZE
MFG
PART NUMBER
10μF/16V
1206
TDK
C3216X7R1C106M
10μF/10V
0805
Murata
GRM21BR61A106K
22μF/10V
1210
Murata
GRB32ER61A226K
I
OMAX
I
LMT
I
L
2
--------
–
V
O
---------
×
=
I
L
V
---------
D
f
s
---
×
=
TABLE 2. MAXIMUM OUTPUT CURRENT CALCULATION
V
IN
(V)
V
O
(V)
L (μH)
F
s
(MHz)
I
OMAX
(mA)
3
9
10
0.65
636
3
12
10
0.65
419
3
15
10
0.65
289
5
9
10
0.65
1060
5
12
10
0.65
699
5
15
10
0.65
482
5
18
10
0.65
338
3
9
10
1.2
742
3
12
10
1.2
525
3
15
10
1.2
395
5
9
10
1.2
1236
5
12
10
1.2
875
5
15
10
1.2
658
5
18
10
1.2
514
ISL97644
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISL97644IRZ-T | Boost + LDO + VON Slice + VCOM |
| ISL97644IRZ-TK | Boost + LDO + VON Slice + VCOM |
| ISL97645 | Boost + VON Slice + VCOM |
| ISL97645IRZ | Boost + VON Slice + VCOM |
| ISL97645IRZ-T | Boost + VON Slice + VCOM |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISL97644IRZ-T | 功能描述:IC REG BOOST LDO VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97644IRZ-TK | 功能描述:IC REG BOOST LDO VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645AIRZ | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645AIRZ-T | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL97645AIRZ-TK | 功能描述:IC REG BOOST VON VCOM 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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