參數(shù)資料
型號： MAX1878EGC
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Analog IC
中文描述： 0.8 A SWITCHING REGULATOR, 500 kHz SWITCHING FREQ-MAX, CQCC12
封裝： 4 X 4 MM, 0.90 MM HEIGHT, QFN-12
文件頁數(shù)： 2/8頁
文件大小： 313K
代理商： MAX1878EGC
E
MAX1800 Evaluation Kit
2
_______________________________________________________________________________________
Quick Start
Recommended Equipment
1.8V to 5.5V battery or power supply
Digital voltmeter (DVM)
Connections and Setup
1) Make sure jumpers JU1
–
JU6 are connected in the 1-
2 (ON) position. This ensures that all converters will
turn-on at power-up.
2) Before loading any output, check the output voltage
and output current capability shown in Table 1. See
the Startup Input Voltage vs. MAIN Output Current
graph in the
Typical Operating Characteristics
in the
MAX1800 data sheet before loading MAIN.
3) Make sure jumpers JU7
–
JU12 are connected if no
external loads are attached to the OUT1A, OUT1B,
OUT1C, OUT2A, OUT2B, and OUT2C outputs.
4) Attach a 1.8V to 5.5V battery or power supply to IN.
5) Using the DVM, measure the voltage at MAIN, LDO,
OUT1_, OUT2_, OUT3 and OUT4.
Detailed Description
The main output (MAIN) powers the MAX1800
’
s internal
circuitry. MAIN must be regulated before any of the
other outputs function.
To enable MAIN, place jumper JU2 in the 1-2 position.
Apply 1.8V to 5.5V between IN and GND. The voltage
between MAIN and GND should be approximately 3.3V
if IN is <3.3V. Because the IC is powered from MAIN,
the IC does not work at maximum efficiency until MAIN
is in regulation. Thus, at low battery voltages and heavy
loads, MAIN may not have sufficient power to start. The
output current capability shown in Table 1 is valid for
input voltages down to 1.8V. The circuit operates for
DESIGNATION
JU1
JU6
JU7
JU12
QTY
6
6
DESCRIPTION
3-pin headers
2-pin headers
L1
1
1.4μH inductor
Sumida CR43-1R4
L2
1
10μH inductor
Sumida CDRH6D38-100
L3
1
0.5μH inductor
Sumida CR43 Type Sample
4757-T019
Q1, Q2, Q3, Q5
4
N-channel MOSFETs
Fairchild Semiconductor
FDN337N
Q4
1
P-channel MOSFET
Fairchild Semiconductor
NDS336P
R37, R38, R42,
R43
4
200
±
5% resistors (1206)
R1
1
40.2k
±
1% resistor (0603)
R2, R29, R31, R33
4
Shorted in the PC board
layout (0402)
(not installed)
R3, R12
R15,
R26, R28, R30,
R32, R34
10
Open, not installed (0402)
R4
1
464k
±
1% resistor (0603)
R5, R10, R17,
R19, R22, R25
6
100k
±
1% resistors (0603)
R6
1
200k
±
5% resistor (0402)
Component List (continued)
DESIGNATION
R7, R8, R9, R27
R11, R16, R24
R18
R20
R21
R23
QTY
4
3
1
1
1
1
DESCRIPTION
10k
±
5% resistors (0402)
301k
±
1% resistors (0603)
44.2k
±
1% resistor (0603)
4.7
±
5% resistor (0402)
165k
±
1% resistor (0603)
1M
±
5% resistor (0402)
R35, R36, R40,
R41, R44, R45
6
3k
±
5% resistors (1206)
R39
R46
1
1
750
±
5% resistor (1206)
100k
±
5% resistor (0402)
T1
1
Transformer
Sumida
“
Sample Number
”
:
6333-T330
T2
1
Transformer
Sumida
“
Sample Number
”
:
6333-T329
U1
U2
None
1
1
12
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Shunts
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