MAX14720 Datasheet, PDF (5/38 Pages) Maxim Integrated Products – Extended System Battery Use Time

MAX14720/MAX14750
Power-Management Solution
Electrical Characteristics (continued)
(V_CC = V_BIN = V_LIN = V_HVIN = V_SWIN = 2.7V, T_A = -40°C to +85°C, all registers in their default state, unless otherwise noted. Typical
values are at T_A = +25°C.) (Note 2)
PARAMETER
Pulse Mode Switching
Period Ratio
SYMBOL
T_RATIO
CONDITIONS
f_OSC/f_SW, 128 steps
MIN
TYP
MAX
UNITS
10
138
Short-Circuit Peak
Current Limit
I_{SHRT_BOOST}
V_HVOUT = GND.
0.4
1.1
1.9
A
Thermal-Shutdown
Threshold
T_{SHDN_BST}
T_J rising
150
°C
Thermal-Shutdown
Hysteresis
T_{SHDN_HYST_BST}
21
°C
Buck Converter (C_OUT = 10µF, L = 2.2µH, unless otherwise noted.)
Input Voltage Range
V_BIN
1.8
5.5
V
Quiescent Supply
Current
I_{Q_BUCK}
I_BOUT = 0A
I_BOUT = 0A, BIN UVLO enabled
I_BOUT = 0A, BuckMd[1:0] = 01
0.8
1.6
µA
1
2
4.8
mA
Maximum Operative
Output Current
I_MAXBOUT
250
mA
Output Voltage
V_BOUT
25mV step
1
2
V
Output Accuracy
A_{CC_BOUT}
V_BIN = (V_BOUT + 0.1V) or higher,
I_BOUT = 1mA; average output
-3
+3
%
Dropout Voltage
V_{DROP_BUCK}
I_BOUT = 0A
95
120
mV
Line Regulation Error
V_{LINEREG_BUCK}
V_BIN = from 2V to 5V,
V_BOUT = 1.2V
0.65
%/V
Load Regulation Error
V_{LOADREG_BUCK} BuckInteg = 1, I_BOUT = 200mA
23
mV
Line Transient
V_{LINETRAN_BUCK}
V_BOUT = 1.2V, V_BIN = V_CC: 2.0V to
5V, 1µs rise time
50
mV
Load Transient
V_{LOADTRAN_BUCK}
I_BOUT = 0mA to 200mA, 200ns rise
time
70
mV
Oscillator Frequency
Passive Discharge
Pull-Down Resistance
f_{OSC_BK}
R_{PDL_BK}
1.78
2
5
10
2.25
16
MHz
kΩ
Active Discharge
Current
I_{ACTDL_BK}
5.5
17
33
mA
Time from enable to full current
capability; BuckFst = 0
60
ms
Turn-On Time
t_{ON_BUCK}
Time from enable to full current
capability; BuckFst = 1
30
ms
Startup Output Current
I_{STUP_BK}
BuckFst = 0
18
mA
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