參數(shù)資料
型號(hào)： MAX1774
廠商： Maxim Integrated Products, Inc.
英文描述： 32-Bit Digital Signal Controller with ROM 100-BGA MICROSTAR -40 to 125
中文描述： 雙路、高效率、降壓型轉(zhuǎn)換器，帶有備用電池切換開關(guān)
文件頁數(shù)： 10/21頁
文件大?。?/td> 398K
代理商： MAX1774
M
Dual, High-Effic ienc y, S tep-Down
Converter with Bac kup Battery S witc hover
10
______________________________________________________________________________________
Typic al Operating Charac teristic s (c ontinued)
(Circuit of Figure 1, V
IN
= +5V, V
INC
= +3.3V, T
A
= +25
°
C, unless otherwise noted.)
TURN-ON RESPONSE
MAX1774-14
5V
0
V
OUT
1V/div
2V
1V
100
μ
s/div
3V
0
400
μ
A
200
μ
A
0
INPUT
CURRENT
200mA/div
V
SHDN
5V/div
INPUT CURRENT
V
MAIN
V
CORE
BACKUP SWITCHOVER RESPONSE
MAX1774-15
V
BKUP
5V/div
I
50mA/div
V
10mV/div
V
MAIN
10mV/div
5
μ
s/div
Pin Desc ription
PIN
QSOP
QFN
NAME
FUNCTION
1
30
SHDNM
Shutdown for Main Regulator. Low voltage on
SHDNM
shuts off the main output. For normal
operation, connect
SHDNM
to IN.
2
31
SHDNC
Shutdown for Core Regulator. Low voltage on
SHDNC
shuts off the core output. For normal
operation, connect
SHDNC
to CVL.
3
32
BKUP
Open-Drain Backup Input/Output. The device is in backup mode when
BKUP
is low.
BKUP
can be
externally pulled low to place the device in backup mode.
4
1
MDRV
Open-Drain Drive Output.
MDRV
goes low when the ACI voltage drops below the main voltage plus
220mV and device is not in backup. Connect
MDRV
to the gate of the main battery P-channel
MOSFET to switch the battery to IN when the AC adapter voltage is not present.
5
2
PGNDC
Power Ground for the Core Converter. Connect all grounds together close to the IC.
6
3
PGND
Power Ground. Ground for NDRV and core output synchronous rectifier. Connect all grounds
together close to the IC.
7
4
NDRV
N-Channel Drive Output. Drives the main output synchronous-rectifier MOSFET. NDRV swings
between CVL and PGND.
8
5
CVL
Low-Side Bypass. CVL is the output of an internal LDO regulator. This is the internal power supply
for the device control circuitry as well as the N-channel driver. Bypass CVL with a 1.0μF or greater
capacitor to GND. When CS- is above the CVL switchover threshold (2.47V), CVL is powered from
the main output.
9
6
IN
Power Supply Input
10
7
PDRV
P C hannel D ve Outp ut. D ves the m ai n outp ut hi g h- si d e M OS FE T sw ch. P D RV sw ng s b etw een IN and
C V H The vol ag e at C V H i s r eg ul ated at V
IN
- 4.2V unl ess the i np ut vol ag e i s l ess than 5.5V
11
8
CVH
High-Side Drive Bypass. This is the low-side of the P-channel driver output. Bypass with a 1.0μF
capacitor or greater to IN. When the input voltage is less than 5.5V, CVH is switched to PGND.
12
9
LXB
Backup Converter Switching Node. Connect an inductor from LXB to the backup battery and a
Schottky diode to BIN to complete the backup converter. In backup mode, this step-up converter
powers the main output from the backup battery through BIN.
相關(guān)PDF資料
PDF描述
MAX1774EEI Dual, High-Efficiency, Step-Down Converter with Backup Battery Switchover
MAX1774EMJ 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 85
MAX1775 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125
MAX1775EEE 32-Bit Digital Signal Controller with ROM 100-LQFP -40 to 125
MAX1776 32-Bit Digital Signal Controller with ROM 100-BGA MICROSTAR -40 to 85
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MAX1774EGJ 制造商:Maxim Integrated Products 功能描述:
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