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| 型号： | MAX1700EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ 0.8A 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： | 2.2 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 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-Cell to 3-Cell, High-Power (1A),
Low-Noise, Step-Up DC-DC Converters
Reference
The MAX1700/MAX1701 have an internal 1.250V, 1%
bandgap reference. Connect a 0.22μF bypass capaci-
tor to GND within 0.2in. (5mm) of the REF pin. REF can
source up to 50μA of external load current.
Power-OK (MAX1701)
The MAX1701 features a power-good comparator. This
comparator’s open-drain output (POK) is pulled low
when the output voltage falls to 10% below the regula-
tion point.
IN
Gain Block (MAX1701)
The MAX1701’s gain block can function as a third com-
parator or can be used to build a linear regulator using
an external P-channel MOSFET pass device. The gain-
block output is a single-stage transconductance ampli-
fier that drives an open-drain N-channel MOSFET.
Figure 9 shows the gain block used in a linear regula-
tor. The output of an external P-channel pass element is
compared to the internal reference. The difference is
amplified and used to drive the gate of the pass ele-
ment. Use a logic-level PFET such as the Fairchild
NDS336P (R DS(ON) = 270m ? ). If the PFET R DS(ON) is
less than 250m ? , the linear regulator output filter
capacitance may need to be increased to above 47μF.
LX
P
__________________Design Procedure
MAX1701
2x
100 μ F
20k
47 μ F
Setting the Output Voltages
Set the output voltage between 2.5V and 5.5V by con-
AO
N
necting a resistor voltage-divider to FB from OUT to
GND, as shown in Figure 2. The resistor values are then
as follows:
R1 = R2 (V OUT /V FB - 1)
REF
AIN
R6
R5
where V FB , the boost-regulator feedback setpoint, is
1.23V. Since the input bias current into FB is less than
20nA, R2 can have a large value (such as 270k ? or
less) without sacrificing accuracy. Connect the resistor
Figure 9. Using Gain Block as a Linear Regulator
Table 4. Component Suppliers
voltage-divider as close to the IC as possible, within
0.2in. (5mm) of the FB pin.
Inductor Selection
SUPPLIER
AVX
Coilcraft
Matsuo
Motorola
Sanyo
Sumida
PHONE
USA: (803) 946-0690
(800) 282-4975
USA: (847) 639-6400
USA: (714) 969-2491
USA: (602) 303-5454
USA: (619) 661-6835
Japan: 81-7-2070-6306
USA: (847) 956-0666
Japan: 81-3-3607-5111
FAX
(803) 626-3123
(847) 639-1469
(714) 960-6492
(602) 994-6430
(619) 661-1055
81-7-2070-1174
(847) 956-0702
81-3-3607-5144
The MAX1700/MAX1701 ’s high switching frequency
allows the use of a small surface-mount inductor. A
10μH inductor should have a saturation-current rating
that exceeds the N-channel switch current limit of 1.6A.
However, it is generally acceptable to bias the inductor
current into saturation by as much as 20%, although
this will slightly reduce efficiency. For high efficiency,
choose an inductor with a high-frequency core material
(such as ferrite) to reduce core losses. To minimize
radiated noise, use a toroid, pot core, or shielded bob-
bin inductor. Connect the inductor from the battery to
the LX pin as close to the IC as possible. See Table 4
for a list of component suppliers and Table 5 for sug-
gested components.
Table 5. 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
1N5817
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