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| 型号： | MAX1705EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 15/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 0.85A 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 260kHz ~ 340kHz |
| 电流 - 输出： | 850mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
1- to 3-Cell, High-Current, Low-Noise,
Step-Up DC-DC Converters with Linear Regulator
less) without sacrificing accuracy. Connect the resistor
voltage-divider as close to the IC as possible, within
0.2in. (5mm) of the FB pin.
Alternatively, set the step-up converter output to track
the linear regulator by 300mV. To accomplish this, set
TRACK to OUT.
To set the low-dropout linear-regulator output, use a
resistor voltage-divider connected to FBLDO from LDO
to GND. Set the output to a value at least 300mV less
than the step-up converter output using the following
formula:
500mA. Attach the diode between the LX and POUT
pins, as close to the IC as possible.
In high-temperature applications, some Schottky
diodes may be unsuitable due to high reverse-leakage
currents. Try substituting a Schottky diode with a higher
reverse voltage rating, or use an ultra-fast silicon rectifi-
er with reverse recover times less than 60ns (such as a
MUR150 or EC11FS1). Do not use ordinary rectifier
diodes, since slow switching speeds and long re-
verse recovery times compromise efficiency and load
regulation.
R 3 = R 4 ?
- 1 ?
? V LDO
? V FBLDO
?
?
Choose Input and Output
Filter Capacitors
Choose input and output filter capacitors that service
the input and output peak currents with acceptable
where V FBLDO , the linear-regulator feedback trip point,
is 1.250V. Since the input bias current into FBLDO is
less than 50nA, R4 can be a large value (such as
270k ? or less). Connect the resistor voltage-divider as
close to the IC as possible, within 0.2in. (5mm) of the
FBLDO pin.
Inductor Selection
The MAX1705/MAX1706s ’ high switching frequency
allows the use of a small surface-mount inductor. Use a
10μH inductor for the MAX1705 and a 22μH inductor
voltage ripple. Choose input capacitors with working
voltage ratings over the maximum input voltage, and
output capacitors with working voltage ratings higher
than the output.
A 100μF, 100m ? , low-ESR tantalum capacitor is recom-
mended at the MAX1706 ’s step-up output. For the
MAX1705, use two in parallel or a 220μF low-ESR tanta-
lum capacitor. The input filter capacitor (C7) also
LINEAR-
for the MAX1706. Make sure the saturation-current rat-
ing exceeds the n-channel switch current limit of 1.55A
REGULATOR
OUTPUT
LDO
POUT
STEP-UP
OUTPUT
for the MAX1705 and 950mA for the MAX1706. For high
efficiency, chose an inductor with a high-frequency
core material, such as ferrite, to reduce core losses. To
minimize radiated noise, use a torroid, pot core, or
C2*
R3
MAX1705
MAX1706
OUT
R1
C1*
shielded-bobbin inductor. See Table 3 for suggested
parts and Table 4 for a list of inductor suppliers.
FBLDO
FB
Connect the inductor from the battery to the LX pin as
close to the IC as possible.
R4
GND
PGND
R2
Attaching the Output Diode
Use a Schottky diode, such as a 1N5817, MBR0520L,
or equivalent. The Schottky diode carries current during
startup, and in PFM mode after the synchronous rectifi-
* OPTIONAL COMPENSATION CAPACITORS
er turns off. Thus, the current rating only needs to be
Figure 8. Feedback Connections for the MAX1705/MAX1706
Table 3. Component Selection Guide
PRODUCTION
Surface Mount
Through Hole
INDUCTORS
Sumida CDR63B, CD73, CDR73B, CD74B series
Coilcraft DO1608, DO3308, DT3316 series
Sumida RCH654 series
CAPACITORS
Matsuo 267 series
Sprague 595D series
AVX TPS series
Sanyo OS-CON series
Nichicon PL series
DIODES
Motorola MBR0520L
Motorola 1N5817
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