MAX1515 Datasheet, PDF (3/24 Pages) Maxim Integrated Products – Low-Voltage, Internal Switch, Step-Down/DDR Regulator

Low-Voltage, Internal Switch,
Step-Down/DDR Regulator
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V_IN = +3.3V, V_CC = V_DD = SHDN = MODE = +3.3V, V_REFIN = V_REF, SKIP = GND, T_A = 0°C to +85°C, unless oth-
erwise noted. Typical values are at T_A = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Sink-Mode Detect Threshold
V_FB -
V_REFIN
MODE = V_CC, V_REFIN = +0.5V to +1.5V
+18
+32
mV
Source-Mode Detect Threshold
MOSFET On-Resistance
Switching Frequency
Maximum Output Current
Current-Limit Threshold
V_FB -
V_REFIN
MODE = V_CC, V_REFIN = +0.5V to +1.5V
R_NMOS
f_SW
I_OUT(RMS)
V_CC = V_DD = V_IN = +3.3V, I_LOAD = 0.5A
(Note 2)
(Note 3)
I_{LIMIT_P}
V_IN = +3.3V, MODE = GND or V_CC,
positive or sourcing mode
I_{LIMIT_N} MODE = V_CC, negative or sinking mode
-32
-18
mV
0.04 0.10
Ω
1
MHz
3.3
A
3.60
4.2
4.85
A
-3.0
Pulse-Skipping Current Threshold
I_{SKIP_P}
V_IN = +3.3V, MODE = GND or V_CC, positive
or sourcing mode
0.5
0.8
1.1
A
Zero Cross Current Threshold
FB Input Bias Current
Off-Time
Extended Off-Time
Minimum On-Time
Maximum On-Time
SS Source Current
SS Sink Current
I_{ZX_P}
V_IN = +3.3V, MODE = GND or V_CC, positive
or sourcing mode
200
mA
I_{ZX_N} MODE = V_CC, negative or sinking mode
-350
FB = 1.01 x V_TARGET (Note 4)
-50
+50
nA
t_OFF
V_FB > 0.3 x V_TARGET
(Note 4)
R_TOFF = 33.2kΩ 0.270 0.34 0.405
R_TOFF = 110kΩ 0.85 1.00 1.15
µs
R_TOFF = 499kΩ
3.8
4.5
5.2
t_OFF(EXT) V_FB < 0.3 x V_TARGET (Notes 2, 4)
4x
t_OFF
µs
t_ON(MIN) (Note 2)
180
ns
t_ON(MAX)
5
11
µs
I_SS(SRC)
I_SS(SNK)
3.50 5.25 6.75
µA
100
µA
No-Load Supply Current
I_CC + I_DD V_IN = 3.3V
+ I_IN (not switching) (Note 4)
MODE = GND,
FBSEL0 = GND,
FBSEL1 = GND,
V_FB = 1.01 x
V_TARGET
450
800
µA
Shutdown Supply Currents
I_CC + I_DD
+ I_IN
I_IN
I_LX
MODE = V_CC,
V_FB = V_TARGET
SHDN = MODE = GND, LX = 0V or 3.3V
SHDN = MODE = GND, LX = 0V
SHDN = MODE = GND, LX = 3.3V
700 1200
0.2
20
µA
0.2
20
0.1
20
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