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參數(shù)資料
| 型號(hào)： | ISL6439 |
| 廠商： | Intersil Corporation |
| 英文描述： | Single Sync Buck PWM Controller for Broadband Gateway Applications |
| 中文描述： | 單同步降壓PWM控制器，寬帶網(wǎng)關(guān)應(yīng)用 |
| 文件頁數(shù)： | 6/15頁 |
| 文件大小： | 379K |
| 代理商： | ISL6439 |
6
Functional Pin Description
14 LEAD SOIC
VCC
This pin provides the bias supply for the ISL6439. Connect a
well-decoupled 3.3V supply to this pin.
COMP and FB
COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the internal
error amplifier and the COMP pin is the error amplifier
output. These pins are used to compensate the voltage-
control feedback loop of the converter.
GND
This pin represents the signal and power ground for the IC.
Tie this pin to the ground island/plane through the lowest
impedance connection available.
PHASE
Connect this pin to the upper MOSFET’s source. This pin is
used to monitor the voltage drop across the upper MOSFET
for overcurrent protection.
UGATE
Connect this pin to the upper MOSFET’s gate. This pin
provides the PWM-controlled gate drive for the upper
MOSFET. This pin is also monitored by the adaptive
shoot-through protection circuitry to determine when the
upper MOSFET has turned off.
BOOT
This pin provides ground referenced bias voltage to the
upper MOSFET driver. A bootstrap circuit is used to create a
voltage suitable to drive a logic-level N-Channel MOSFET.
LGATE
Connect this pin to the lower MOSFET’s gate. This pin provides
the PWM-controlled gate drive for the lower MOSFET. This pin
is also monitored by the adaptive shoot-through protection
circuitry to determine when the lower MOSFET has turned off.
OCSET
Connect a resistor (R
OCSET
) from this pin to the drain of the
upper MOSFET (V
IN
). R
OCSET
, an internal 20
μ
A current
source (I
OCSET
), and the upper MOSFET on-resistance
(r
DS(ON)
) set the converter overcurrent (OC) trip point
according to the following equation:
An overcurrent trip cycles the soft-start function.
ENABLE
This pin is the open-collector enable pin. Pulling this pin to a
level below 0.8V will disable the controller. Disabling the
ISL6439 causes the oscillator to stop, the LGATE and
UGATE outputs to be held low, and the softstart circuitry to
re-arm.
GATE DRIVERS
Upper Gate Source Current
I
UGATE-SRC
V
BOOT
- V
PHASE
= 5V, V
UGATE
= 4V
-
-1
-
A
Upper Gate Sink Current
I
UGATE-SNK
-
1
-
A
Lower Gate Source Current
I
LGATE-SRC
V
VCC
= 3.3V, V
LGATE
= 4V
-
-1
-
A
Lower Gate Sink Current
I
LGATE-SNK
-
2
-
A
PROTECTION / DISABLE
OCSET Current Source
I
OCSET
Commercial
18
20
22
μ
A
Industrial
16
20
22
μ
A
Disable Threshold
V
DISABLE
-
-
0.8
V
Electrical Specifications
Recommended Operating Conditions, Unless Otherwise Noted V
CC
= 3.3V±5% and T
A
= 25°C
(Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
MIN
TYP
MAX
UNITS
12
14
13
4
3
2
1
LGATE
CPVOUT
UGATE
PHASE
VCC
BOOT
GND
CT1
11
7
6
5
9
8
10
CT2
OCSET
FB
CPGND
ENABLE
COMP
16 LEAD 5x5 QFN
1
3
4
15
CPVOUT
CT1
CT2
OCSET
L
G
U
B
16
14
13
2
12
10
9
11
6
5
7
8
PHASE
VCC
CPGND
NC
N
F
C
E
I
PEAK
I
xR
DS ON
)
-------------------------------------------------
=
ISL6439
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相關(guān)代理商/技術(shù)參數(shù) |
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| ISL6439ACB | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6439ACB-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6439ACR | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6439ACR-T | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Intersil Corporation 功能描述: |
| ISL6439AIB | 功能描述:IC REG CTRLR BUCK PWM VM 14-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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