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| 型号： | MAX8869EUE50+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ 1A 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 5V，0.8 V ~ 5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 供应商设备封装： | 16-TSSOP-EP |
| 包装： | 带卷 (TR) |
MAX8869
1A, Microcap, Low-Dropout,
Linear Regulator
Pin Description
PIN
1, 9, 16
2, 3, 4, 5
6
7
8
10
11
12, 13, 14, 15
—
NAME
N.C.
IN
RST
SHDN
SS
GND
SET
OUT
EP
FUNCTION
No Connection. Not internally connected.
Regulator Input. Connect to power source (+2.7V to +5.5V). Bypass with 1 μ F or greater
capacitor to GND (see Capacitor Selection and Regulator Stability ). Connect all IN inputs
together for proper operation.
Reset Output. Open-drain output is low when V OUT is 8% below its nominal value. RST remains
low while the output voltage (V OUT ) is below the reset threshold and for at least 3ms after V OUT
rises to within regulation. Connect a 100k ? pullup resistor to OUT to obtain an output voltage.
Active-Low Shutdown Input. A logic low reduces the supply current to 0.1 μ A. Connect SHDN
to IN for normal operation. In shutdown, RST is low and the soft-start capacitor discharges.
Soft-Start Control. Connect a soft-start capacitor from SS to GND (see Soft-Start Capacitor
Selection ). Leave SS open to disable soft-start.
Ground. Solder both GND and EP to a large pad or to the circuit-board ground plane to
maximize power dissipation.
Voltage-Setting Input. Connect SET to GND for factory-preset output voltage. Connect SET to
an external resistor-divider for adjustable output operation.
Regulator Output. Bypass with a 1 μ F or greater low-ESR capacitor to GND (see Capacitor
Selection and Regulator Stability ). Connect all OUT outputs together for proper operation.
Exposed Pad. Connect to a large ground plane to maximize thermal performance. Not
intended as an electrical connection point.
Detailed Description
The MAX8869 features Dual Mode operation, allowing a
fixed output of +5V, +3.3V, +2.5V, +1.8V, or +1.0V, or
adjustable output from +0.8V to +5.0V. The regulators
are guaranteed to supply 1A of continuous output cur-
rent with only 1μF of output capacitance.
As shown in the functional diagram (Figure 1), the
device has a 0.8V reference, error amplifier, MOSFET
driver, P-channel pass transistor, internal feedback
voltage-divider, soft-start function, reset timer, and Dual
Mode and low V OUT comparators.
The 0.8V reference is connected to the error amplifier’s
inverting input. The error amplifier compares this refer-
ence with the selected feedback voltage and amplifies
the difference. The MOSFET driver reads the error sig-
nal and applies the appropriate drive to the P-channel
transistor. If the feedback voltage is high, the pass tran-
sistor’s gate is pulled up, allowing less current to pass
to the output. The low V OUT comparator senses when
6
the feedback voltage has dropped 8% below its
expected level, causing RST to go low.
The output voltage is fed back through either an inter-
nal resistor-divider connected to OUT or an external
resistor network connected to SET. The Dual Mode
comparator examines V SET and selects the feedback
path. If V SET is below 80mV, the internal feedback path
is used and the output voltage is regulated to the facto-
ry-preset voltage. Otherwise, the output voltage is set
with the external resistor-divider.
Internal P-Channel Pass Transistor
The MAX8869 features a 1A P-channel MOSFET pass
transistor. Unlike similar designs using PNP pass tran-
sistors, P-channel MOSFETs require no base drive,
which reduces quiescent current. PNP-based regula-
tors also waste considerable current in dropout when
the pass transistor saturates and use high base-drive
currents under large loads. The MAX8869 does not suf-
fer from these problems and consumes only 500μA of
quiescent current even in dropout.
Maxim Integrated
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