MAX16999 데이터 시트보기 (PDF) - Maxim Integrated
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MAX16999 Datasheet PDF : 11 Pages
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MAX16999
Ultra-Low Output Voltage, Low-Quiescent-Current
Linear Regulator for High-Temperature Applications
Table 1. Output Currents at TA = +125°C
VOUT
(V)
SINGLE-LAYER BOARD
VIN = 3.3V
(mA)
VIN = 5V
(mA)
MULTILAYER
BOARD
VIN = 5V
(mA)
0.5
92
57
72
0.6
95
59
73
0.7
99
60
75
0.8
100
61
77
0.9
100
63
79
1.0
100
64
81
1.1
100
66
83
1.2
100
68
85
1.5
100
74
92
1.8
100
81
100
2.5
100
100
100
3.3
100
100
100
Undervoltage Lockout (UVLO)
Before the MAX16999 can operate, the input voltage
must exceed the UVLO threshold of 2.2V (max) with a
30mV hysteresis. If the input voltage is below the UVLO
threshold, OUT becomes high impedance and EN is
ignored regardless if it is driven high or low.
Applications Information
Capacitor Selection
Capacitors are required at the MAX16999 input and out-
put for stable operation over the full temperature range
and with load currents up to 100mA. Connect a 1μF
ceramic capacitor between IN and GND and a 4.7μF
ceramic capacitor between OUT and GND. The input
capacitor (CIN) lowers the source impedance of the input
supply. Use larger output capacitors to reduce noise and
improve stability and power-supply rejection. The output
capacitor’s equivalent series resistance (ESR) affects
stability and output noise. Use output capacitors with an
ESR of 30mΩ or less to ensure stability and optimize
transient response. Surface-mount ceramic capacitors
have very low ESR and are commonly available in val-
ues up to 10μF. Connect CIN and COUT as close to the
MAX16999 as possible to minimize the impact of the PCB
trace inductance.
Using MAX16999 in Parallel
with Another Supply
The MAX16999 can be used in parallel with another sup-
ply of equal voltage (see Figure 2). The circuit shows a
typical low-power solution for a μC.
4V TO 36V
MAX1745
MAX8693
3.3V, 1A LOW-IQ
INTERFACE SUPPLY
1.2V, 3A
CORE SUPPLY
TO µC
MAX16999
1.2V LOW-IQ
CORE BYPASS
Figure 2. Low-Quiescent μC Supply Solution
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