參數(shù)資料
型號(hào)： MAX1714BEEE
廠(chǎng)商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： High-Speed Step-Down Controller for Notebook Computers
中文描述： SWITCHING CONTROLLER, 600 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 0.150 INCH, 0.025 INCH PITCH, MO-137AA, QSOP-16
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 443K
代理商： MAX1714BEEE
M
+5V Bias Supply (V
CC
and V
DD
)
The MAX1714 requires an external +5V bias supply in
addition to the battery. Typically, this +5V bias supply is
the notebook’s 95% efficient +5V system supply.
Keeping the bias supply external to the IC improves effi-
ciency and eliminates the cost associated with the +5V
linear regulator that would otherwise be needed to sup-
ply the PWM circuit and gate drivers. If stand-alone
capability is needed, the +5V supply can be generated
with an external linear regulator such as the MAX1615.
The battery and +5V bias inputs can be tied together if
the input source is a fixed +4.5V to +5.5V supply. If the
+5V bias supply is powered up prior to the battery sup-
ply, the enable signal (
SHDN
) must be delayed until the
battery voltage is present in order to ensure startup. The
+5V bias supply must provide V
CC
and gate-drive
power, so the maximum current drawn is:
I
BIAS
= I
CC
+ f (Q
G1
+ Q
G2
) = 5mA to 30mA (typ)
where I
CC
is 600μA typical, f is the switching frequency,
and Q
G1
and Q
G2
are the MOSFET data sheet total
gate-charge specification limits at V
GS
= 5V.
Free-Running, Constant-On-Time PWM
Controller with Input Feed-Forward
The Quick-PWM control architecture is a pseudo-fixed-fre-
quency, constant-on-time current-mode type with voltage
feed-forward (Figure 2). This architecture relies on the out-
put filter capacitor’s ESR to act as the current-sense resis-
tor, so the output ripple voltage provides the PWM ramp
signal. The control algorithm is simple: the high-side
switch on-time is determined solely by a one-shot whose
period is inversely proportional to input voltage and direct-
ly proportional to output voltage. Another one-shot sets a
minimum off-time (400ns typical). The on-time one-shot is
triggered if the error comparator is low, the low-side switch
current is below the current-limit threshold, and the mini-
mum off-time one-shot has timed out.
High-Speed Step-Down Controller
for Notebook Computers
10
______________________________________________________________________________________
Table 1. Component Selection for Standard Applications
Table 2. Component Suppliers
4.5V to 5.5V
600kHz
7V to 20V
300kHz
7V to 20V
300kHz
Input Range
Frequency
100μF, 10V
Sanyo POSCAP 10TPA100M
(2) 470μF 6V
Kemet T510X477108M006AS
470μF, 6V
Kemet T510X477108M006AS
C2 Output Capacitor
100μF, 10V
Sanyo POSCAP 10TPA100M
(2) 10μF, 25V
Taiyo Yuden TMK432BJ106KM
10μF, 25V
Taiyo Yuden TMK432BJ106KM
C1 Input Capacitor
3.3μH
Coiltronics UP1B-3R3
1.5μH
Sumida CEP1251R5MC
6.8μH
Coilcraft DO3316P-682
L1 Inductor
Motorola MBR0520LT1
Motorola MBRS340T3
Nihon EP10QY03
D2 Rectifier
International Rectifier
1/2 IRF7301
Fairchild Semiconductor
FDS6670A
Fairchild Semiconductor
1/2 FDS6982A
Q2 Low-Side
MOSFET
International Rectifier
1/2 IRF7301
International Rectifier
IRF7811
Fairchild Semiconductor
1/2 FDS6982A
Q1 High-Side
MOSFET
2.5V AT 1.5A
1.6V AT 8A
2.5V AT 4A
COMPONENT
[1] 602-994-6430
602-303-5454
814-237-1431
800-831-9172
Motorola
[1] 408-986-1442
[1] 714-960-6492
408-986-0424
714-969-2491
Kemet
Matsuo
[1] 408-721-1635
[1] 310-322-3332
408-822-2181
310-322-3331
Fairchild
International Rectifier
[1] 561-241-9339
561-241-7876
Coiltronics
[1] 847-639-1469
847-639-6400
Coilcraft
[1] 516-435-1824
516-435-1110
Central Semiconductor
[1] 803-626-3123
803-946-0690
AVX
FACTORY FAX
[Country Code]
USA PHONE
MANUFACTURER
[1] 408-573-4159
[1] 847-390-4405
408-573-4150
847-390-4461
Taiyo Yuden
TDK
[1] 603-224-1430
[81] 3-3607-5144
603-224-1961
847-956-0666
Sprague
Sumida
[1] 408-970-3950
408-988-8000
800-554-5565
Siliconix
[81] 7-2070-1174
619-661-6835
Sanyo
[81] 3-3494-7414
805-867-2555*
NIEC (Nihon)
[1] 814-238-0490
Murata
*Distributor
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1714BEEE+ 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE+T 功能描述:電流型 PWM 控制器 Step-Down Controller for Notebook RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE-T 功能描述:電流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
MAX1714BEEE-TG074 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1714BEVKIT 功能描述:電流型 PWM 控制器 Evaluation Kit for the MAX1714B RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
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