参数资料
| 型号： | LT3032MPDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A 14-DFN |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正可调式和负可调式 |
| 输出电压： | ±1.22 V ~ ±20 V |
| 输入电压： | ±2.3 V ~ ±20 V |
| 电压 - 压降（标准）： | 0.27V @ 150mA，0.3V @ -150mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 170mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-DFN（4x3） |
| 包装： | 带卷 (TR) |
LT3032 Series
APPLICATIONS INFORMATION
V OUTP = 1.22 V ? 1 +
? + ( I ADJP ) ( R 2P )
TheLT3032isadual150mApositiveandnegativelownoise
low dropout linear regulator with micropower quiescent
current and shutdown. It supplies ±150mA at a dropout
OUTP
LT3032
R2P
+
V OUTP
V ADJP = 1.22 V
?
?
R 2P ?
R 1P ?
of 300mV. Output voltage noise can be lowered on the
positive side to 20μV RMS and to 30μV RMS on the negative
ADJP
R1P
I ADJP = 30 nA at 25 ° C
OUTPUT RANGE = 1.22 V TO 20 V
V OUTN = –1.22 V ? 1 +
? + ( I ADJN ) ( R 2N )
sideoverthe10Hzto100kHzbandwidthwiththeaddition
of 0.01μF reference bypass capacitors. Additionally, the
GND
R1N
?
?
R 2N ?
R 1N ?
reference bypass capacitors improve transient response,
lowering the settling time for transient load conditions.
Quiescent current is 25μA for the positive side and –30μA
ADJN
OUTN
R2N
+
V OUTN
V ADJN = –1.22 V
I ADJN = –30 nA at 25 ° C
OUTPUT RANGE = –1.22 V TO – 20 V
for the negative side (45μA each for the LT3032-12/
LT3032-15), typically dropping to less than 3μA total in
shutdown. In addition to the low quiescent current, the
LT3032 incorporates several protection features which
make it ideal for use in battery-powered systems. If the
load is common mode between the two outputs, it does
not matter which output starts ?rst; either output can be
pulled to the opposing side of ground and the regulator
will still start and operate.
Setting Output Voltage
The adjustable LT3032 has output voltage ranges of 1.22V
to 20V for the positive side and –1.22V to –20V for the
negative side. The output voltages are set by the ratio of
two external resistor dividers as shown in Figure 1. The
LT3032 servos the outputs to maintain the voltages at the
ADJP and ADJN pins to 1.22V and –1.22V, respectively.
The current in the bottom resistor of each divider (R1P
or R1N) is equal to 1.22V/R1 and the current in the top
resistor (R2P or R2N) is equal to the current in the bottom
resistor plus the respective ADJP/ADJN pin bias current.
The bias current for ADJP and ADJN is 30nA at 25°C,
?owing into the pin for ADJP and ?owing out of the pin
for ADJN. The output voltages can then be calculated us-
ing the formulas shown in Figure 1. The value of R1P or
R1N should be less than 250k to minimize errors in the
resultant output voltage caused by the ADJP/ADJN pin
bias current. Note that in shutdown the respective output
is turned off and the divider current will be zero. Curves
of ADJP Pin Voltage, ADJN Pin Voltage, ADJP Pin Bias
Current, and ADJN Pin Bias Current (all vs Temperature)
3032 F01
Figure 1. Setting Output Voltages
The LT3032 is tested and speci?ed with the ADJP/ADJN
pin tied to the respective OUTP/OUTN pin and a ±5μA DC
load (unless otherwise speci?ed) for an output voltage
of ±1.22V. Speci?cations for output voltages greater than
this will be proportional to ±1.22V; (V OUT /±1.22V). For
example, load regulation for an output current change
of 1mA to 150mA is –2mV typical at V OUTN = –1.22V. At
V OUTN = –12V, load regulation is:
(–12V/–1.22V)?(–2mV) = –19.6mV
Bypass Capacitors and Low Noise Performance
The LT3032 provides reasonable noise performance
without reference bypass capacitors from OUTP/OUTN
to the corresponding BYPP/BYPN pin. Using the LT3032
with the addition of reference bypass capacitors lowers
output voltage noise. Good quality low leakage capacitors
are recommended. These capacitors bypass the internal
references for the positive and negative sides of the LT3032,
providing low frequency noise poles. The noise poles
provided by the bypass capacitors decrease the output
voltage noise to as low as 20μV RMS for the positive side
and 30μV RMS for the negative side with the use of 0.01μF
bypass capacitors.
The BYPP pin and BYPN pin are high impedance nodes
and leakage into or out of these pins affects the reference
voltage. The BYPP pin operates at approximately 74mV at
appear in the Typical Performance Characteristics.
3032fd
16
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