MAX8720ETX(2004) View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX8720ETX Datasheet PDF : 31 Pages
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Dynamically Adjustable 6-Bit VID
Step-Down Controller
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V+ =15V, SHDN = SKIP = VDD = VCC = +5V, VOUT = 1.25V, TA = -40°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.) (Note 4)
PARAMETER
PWM CONTROLLER
Input Voltage Range
DC Output Voltage Accuracy
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Battery Voltage, V+
2
VCC, VDD
4.5
DAC codes from 0.9V
to 1.85V
-1
V+ = 4.5V to 28V,
includes load
DAC codes from
0.45V to 0.875V
-15
regulation error
DAC codes from
0.275V to 0.425V
-18
28
V
5.5
+1
%
+15
mV
+18
FB Input Resistance
TIME Frequency Accuracy
115
150kHz, RTIME = 120kΩ
-8
818kHz, RTIME = 22kΩ
-12
38kHz, RTIME = 470kΩ
-12
V+ = 5V, FB = 1.25V, TON = GND
230
(1000kHz)
265
kΩ
+8
+12
%
+12
290
On-Time (Note 2)
TON = REF
165
(550kHz)
tON
V+ = 12V,
FB = 1.25V
TON = open
(300kHz)
320
215
ns
390
TON = VCC
465
565
(200kHz)
Minimum Off-Time (Note 2)
BIAS AND REFERENCE
Quiescent Supply Current (VCC)
Quiescent Supply Current (VDD)
Quiescent Battery Supply
Current (V+)
Shutdown Supply Current (VCC)
Shutdown Supply Current (VDD)
Shutdown Battery Supply
Current (V+)
tOFF(MIN)
TON = VCC, open, or REF (200kHz, 300kHz,
or 550kHz)
TON = GND (1000kHz)
ICC FB forced above their regulation points
IDD FB forced above their regulation points
I+
ICC
SHDN = GND
IDD
SHDN = GND
I+
SHDN = GND, VCC = VDD = 0V or 5V
500
ns
375
1300
µA
5
µA
40
µA
25
µA
5
µA
5
µA
Reference Voltage
FAULT DETECTION
VREF VCC = 4.5V to 5.5V, no REF load
1.98
2.02
V
VCC Undervoltage-Lockout
Threshold
Rising edge, hysteresis = 20mV, PWM
4.1
disabled below this level
4.4
V
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