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參數(shù)資料
| 型號： | IRU3034CS |
| 英文描述： | 8 Pin PWM Switcher CIC with Current Limiting in a 8-Pin SOIC(NB) package |
| 中文描述： | 8引腳的PWM Switcher的議會與當(dāng)前在8引腳SOIC（注）封裝限制 |
| 文件頁數(shù)： | 4/14頁 |
| 文件大小： | 83K |
| 代理商： | IRU3034CS |
4-6
Rev. 1.2
12/8/00
IRU3004, IRU3005
PIN DESCRIPTIONS
PIN# PIN SYMBOL
19
PIN DESCRIPTION
LSB input to the DAC that programs the output voltage. This pin can be pulled up
externally by a 10k resistor to either 3.3V or 5V supply.
Input to the DAC that programs the output voltage. This pin can be pulled up externally
by a 10k
resistor to either 3.3V or 5V supply.
Input to the DAC that programs the output voltage. This pin can be pulled up externally
by a 10k resistor to either 3.3V or 5V supply.
MSB input to the DAC that programs the output voltage. This pin can be pulled up
externally by a 10k resistor to either 3.3V or 5V supply.
This pin selects a range of output voltages for the DAC. When in the LOW state the
range is 1.3V to 2.05V. For VID codes of all "1" the IRU3004 keeps all the outputs on.
This pin is an open collector output that switches LO when the output of the con-
verter is not within
±
10% (typ) of the nominal output voltage. When PWRGD pin switches
LO the sat voltage is less than 0.4V at 3mA.
This pin is connected directly to the output of the Core supply to provide feedback to the
Error comparator.
This pin is connected to the Drain of the power MOSFET of the Core supply and it
provides the positive sensing for the internal current sensing circuitry. An external resis
tor programs the C.S threshold depending on the RDS of the power MOSFET. An
external capacitor is placed in parallel with the programming resistor to provide high
frequency noise filtering.
This pin is connected to the Source of the power MOSFET for the Core supply and it
provides the negative sensing for the internal current sensing circuitry.
This pin provides the soft start for the switching regulator. An internal current source
charges an external capacitor that is connected from this pin to the GND which ramps
up the outputs of the switching regulator, preventing the outputs from overshooting as
well as limiting the input current. The second function of the Soft Start cap is to provide
long off time (HICCUP) for the synchronous MOSFET during current limiting.
This pin programs the oscillator frequency in the range of 50kHZ to 500kHZ with an
external capacitor connected from this pin to the GND.
This pin controls the gate of an external transistor for either the GTL+ linear regulator or
Clock supply.
This pin provides the feedback for the linear regulator that its output drive is Lin1 pin. For
IRU3005, this pin is connected to the 2.5V regulator, eliminating the external dividers.
This pin controls the gate of an external transistor for either the GTL+ linear regulator or
Clock supply.
This pin provides the feedback for the linear regulator that its output drive is Lin2 pin.
This pin serves as the ground pin and must be connected directly to the ground plane.
A high frequency capacitor (0.1 to 1
μ
F) must be connected from V5 and V12 pins to
this pin for noise free operation.
Output driver for the synchronous power MOSFET.
Output driver for the high-side power MOSFET.
This pin is connected to the 12 V supply and serves as the power Vcc pin for the output
drivers. A high frequency capacitor (0.1 to 1
μ
F) must be connected directly from this pin
to GND pin in order to supply the peak current to the power MOSFET during the transi
tions.
5V supply voltage.
D0
18
D1
17
D2
16
D3
15
D4
6
PGd
14
Vfb3
8
CS+
7
CS-
13
SS
1
Ct
2
Lin1
3
Vfb1
20
Lin2
4
10
Vfb2
Gnd
11
9
12
LDrv
HDrv
V12
5
V5
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| IRU3034CSTR | 功能描述:IC CNTRL PWM SYNC SWITCH 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
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