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參數(shù)資料
| 型號： | MAX1813EEI |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dynamically-Adjustable, Synchronous Step-Down Controller with Integrated Voltage Positioning |
| 中文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, 0.025 INCH PITCH, QSOP-28 |
| 文件頁數(shù)： | 12/38頁 |
| 文件大?。?/td> | 738K |
| 代理商： | MAX1813EEI |
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M
Dynamically-Adjustable, Synchronous Step-Down
Controller with Integrated Voltage Positioning
12
______________________________________________________________________________________
Pin Description
PIN
NAME
FUNCTION
1
V+
Battery Voltage Sense Connection. Connect V+ to the input power source. V+ is used only for PWM
one-shot timing. DH on-time is inversely proportional to the input voltage over a 2V to 28V range.
2
VPCS
Current-Sense Input. Connect a current-sense resistor (R
SENSE
) between VPCS and PGND. The
voltage on VPCS controls both the voltage-positioning and current-limit circuits. The slope of the
voltage-positioned output is controlled with the current-sense resistor and the gain resistor connected
between CC and REF. See
Setting Voltage Positioning
. The current-limit threshold is set by ILIM. If the
current-sense signal (inductor current
×
R
SENSE
) exceeds the current-limit threshold, the MAX1813
will not initiate a new cycle. VPCS can also be connected to LX to reduce component count, but CC
must be connected to REF to disable the voltage positioning.
3
SKP/
SDN
Combined Shutdown and Skip-Mode Control. Drive SKP/
SDN
to GND for shutdown, leave SKP/
SDN
open for low-noise forced-PWM mode, or drive to V
CC
for normal pulse-skipping operation:
Shutdown mode:
SKP/
SDN
= GND
Low-noise forced-PWM mode:
SKP/
SDN
= open
Normal pulse-skipping operation:
SKP/
SDN
= V
CC
Low-noise forced PWM mode causes inductor current recirculation at light loads and suppresses
pulse-skipping operation. Forcing SKP/
SDN
with 12V to 15V clears the fault latch and disables
undervoltage protection, overvoltage protection, and thermal shutdown with otherwise normal pulse-
skipping operation. Exiting shutdown clears the fault latch.
Do not connect SKP/
SDN
to voltages over 15V.
Slew-Rate Adjustment Pin. Connect a resistor from TIME to GND to set the internal slew-rate clock. A
470k
to 47k
resistor sets the clock from 38kHz to 380kHz, respectively:
f
SLEW
= 150kHz x 120k
/ R
TIME
.
4
TIME
5
FB
Feed b ack Inp ut. C onnect FB to the j uncti on of the exter nal i nd uctor and outp ut cap aci or ( Fi g ur e 1)
6
CC
Compensation Capacitor and Voltage-Positioning Gain Adjustment. Connect a 47pF to 1000pF (47pF
typ) capacitor from CC to GND to adjust the loop
’
s response time. Connect a resistor (R
AVPS
) from
CC to REF to set the gain of the voltage positioning amplifier.
where the voltage-positioning amplifer
’
s transconductance (G
m
) is typically 20
μ
S.
Suspend-Mode Voltage Select Inputs. S0 and S1 are 4-level logic inputs that select the suspend-
mode VID code for for the suspend-mode multiplexer inputs. If SUS is high, the suspend-mode VID
code is delivered to the DAC. See
Suspend-Mode Internal Mux
.
Analog Supply Voltage Input for PWM Core. Connect V
CC
to the system supply voltage (4.5V to 5.5V)
through a series 20
resistor. Bypass to GND with a 0.22
μ
F or greater capacitor as close to the
MAX1813 as possible.
On-Time Selection-Control Input. This is a 4-level input used to determine DH on-time. Connect to
GND, REF, or V
CC
, or leave TON unconnected to set the following switching frequencies: GND =
1000kHz, REF = 600kHz, floating = 300kHz, and V
CC
= 200kHz.
7, 8
S0, S1
9
V
CC
10
TON
V
V
G R
V
V
OUT
OUT PROG
(
REF
=
+
)
1
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1813EEI+ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1813EEI+T | 功能描述:DC/DC 開關(guān)控制器 Dynamically Adjustable Synchronous Step-Down Controller w/Integrated Voltage Positioning RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1813EEI-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1813EVKIT | 功能描述:DC/DC 開關(guān)控制器 Evaluation Kit for the MAX1813 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1813XR46+ | 制造商:Maxim Integrated Products 功能描述: |
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