- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383325 > MAX1552 (Maxim Integrated Products, Inc.) Complete Power IC for Low-Cost PDAs PDF資料下載
參數(shù)資料
| 型號： | MAX1552 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete Power IC for Low-Cost PDAs |
| 中文描述： | 完備的電源芯片，用于低成本PDA |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 324K |
| 代理商： | MAX1552 |
Detailed Description
Linear Regulators
The MAX1552 contains all power blocks and voltage
monitors for a small PDA. Power for logic and other
subsystems is provided by four LDOs:
MAIN
—
Provides 3.3V at a guaranteed 350mA with
a typical current limit of 650mA.
SDIG
—
Provides 3.3V at a guaranteed 250mA for
secure digital cards with a typical current limit at
310mA.
COR1
—
1.5V for CPU core guarantees 250mA and
typically current limits at 450mA.
COR2
—
1.8V for CODEC core guarantees 30mA
and typically current limits at 50mA.
MAIN and COR1 regulators are always on as long as
the IC is not in low-voltage shutdown (V
IN
< 3V). COR2
and SDIG can be turned on and off independently
through logic signals at ENC2 and ENSD, respectively.
When SDIG is turned off, reverse current is blocked so
the SDIG output can be biased with an external source
when no power is present at IN. Leakage current is typ-
ically 3μA with 3.3V at SDIG.
LCD Boost DC-to-DC
In addition to the LDOs, the MAX1552 also includes a
low-current, high-voltage-boost DC-to-DC converter for
LCD bias. This circuit can output up to 28V and can be
adjusted with either an analog or PWM control signal
using external components.
SW provides an input-power disconnect for the LCD
when ENLCD is low (off). The input-power disconnect
function is ideal for applications that require the output
voltage to fall to 0V in shutdown (true shutdown). If true
shutdown is not required, the SW switch can be
bypassed by connecting the boost inductor directly to
IN and removing the bypass capacitor on SW (C9 in
Figure 1).
M
Complete Power IC for
Low-Cost PDAs
_______________________________________________________________________________________
7
Pin Description
PIN
1
2
NAME
COR1
IN
FUNCTION
1.5V, 200mA LDO Output for CPU Core. COR1 turns off when V
IN
< 3V.
Input Voltage to the Device. Bypass IN to GND with a 1μF capacitor.
3.3V, 200mA LDO Output for Secure Digital Card Slot. SDIG has reverse-current protection so SDIG can be
biased when no power is present at IN. SDIG output turns off when V
IN
< 3V or when ENSD goes low.
SDIG Enable Input. Drive ENSD low to turn off the SDIG output. Drive ENSD high to turn on the SDIG output.
1.25V Reference. Bypass REF with a 0.1μF capacitor to GND.
Reset Output.
RS
is an active-low, open-drain output that goes low when V
IN
falls below 3.0V.
RS
deasserts
when V
IN
goes above 3.4V. Connect a 1M
pullup resistor from
RS
to MAIN.
Low-Battery Output.
LBO
is an active-low, open-drain output that goes low when V
IN
falls below 3.6V.
LBO
deasserts when V
IN
goes above 3.8V. Connect a 1M
pullup resistor from
LBO
to MAIN.
Ground
LCD Boost Switch. Connect LX to a boost inductor and a rectifying Schottky diode. See Figure 1.
LCD True Shutdown Switch Output. SW is the power source for the boost inductor. SW turns on when ENLCD
is high.
LCD True Shutdown Switch Input. The SWIN-to-SW switch turns off when ENLCD goes low or when V
IN
< 3V.
Connect SWIN to IN.
LCD Feedback Input. Connect LFB to a resistor-divider network between the LCD output and GND. The
feedback threshold is 1.25V.
Enable Input for LCD (Boost Regulator). Drive ENLCD high to activate the LCD boost. Drive ENLCD low to
shut down the LCD output.
Enable Input for Secondary Core LDO (COR2). Drive ENC2 high to turn on COR2. Drive low to turn off COR2.
1.8V, 30mA LDO Output for Secondary Core. COR2 output turns off when V
IN
< 3V or when ENC2 goes low.
3.3V, 300mA LDO Output for Main Supply. MAIN output turns off when V
IN
< 3V.
3
SDIG
4
5
ENSD
REF
6
RS
7
LBO
8
9
GND
LX
10
SW
11
SWIN
12
LFB
13
ENLCD
14
15
16
ENC2
COR2
MAIN
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1552ETE | Complete Power IC for Low-Cost PDAs |
| MAX1553ETA | High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs |
| MAX1553EVKIT | MAX1553 Evaluation Kit |
| MAX1554ETA | High-Efficiency, 40V Step-Up Converters for 2 to 10 White LEDs |
| MAX1555EZK | PLASTIC ENCAPSULATED DEVICES |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1552ETE | 功能描述:PMIC 解決方案 Complete PMIC for PDAs RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1552ETE-T | 功能描述:PMIC 解決方案 Complete PMIC for PDAs RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel |
| MAX1552EVKIT | 制造商:Maxim Integrated Products 功能描述:COMPLETE PMIC FOR LOW COST PDA'S - Rail/Tube |
| MAX1553ETA | 制造商:Maxim Integrated Products 功能描述:SMALLEST, HIGHEST-EFFICIENCY, 40V STEP-UP CON - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX1553ETA+ | 制造商:Maxim Integrated Products 功能描述:LED DRVR 10SEGMENT 2.7V TO 5.5V 8TDFN EP - Rail/Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。