Datasheet

MAX16993 Step-Down Controller with
Dual 2.1MHz Step-Down DC-DC Converters
www.maximintegrated.com
Maxim Integrated │ 4
Electrical Characteristics (continued)
(V
SUP
= 14V, V
PV1
= V
BIAS
, V
PV2
= V
PV3
= V
OUT1
; T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at
T
A
= +25°C under normal conditions, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
OUT2 AND OUT3: LOW-VOLTAGE SYNCHRONOUS STEP-DOWN DC-DC CONVERTERS
Supply Voltage Range V
SUP
2.7 5.5 V
Supply Current I
PV_
V
EN_
= 5V, no load 0.1 5 µA
Skip Mode Peak Current 0.2 x I
LMAX
mA
Voltage Accuracy V
OUT
0A≤I
LOAD
≤I
MAX,
PWM mode -3.0 +3.0
Feedback-Voltage Accuracy Adjustable mode, I
OUT2
= 0mA 0.806 0.815 0.824
Load Regulation 0A≤I
LOAD
≤I
MAX
(PWM mode) -1.5 -1.0 %/A
LX_ On-Resistance High I
LX_
= -800mA 70 110 mΩ
LX_ On-Resistance Low I
LX_
= 800mA 50 90 mΩ
Current-Limit Threshold I
LMAX
I
MAX
= 3.0A option (see the Selector Guide) 5.0 5.6
A
I
MAX
= 1.5A option (see the Selector Guide) 2.5 3.0
LX_ Rise/Fall Time PV2 = PV3 = 3.3V, I
OUT_
= 2A 4 ns
Soft-Start Ramp Time 2.5 ms
LX_ Leakage Current 0.01 µA
Duty-Cycle Range PWM mode 15 100 %
LX_ Discharge Resistance 22 48 Ω
RESET_
Reset Threshold
Rising (relative to nominal output voltage) 92 95 98 %
Falling (relative to nominal output voltage) 90 92 95
OUT1 Active Timeout Period
See the Selector Guide
(16,384 clocks)
7.8
ms
See the Selector Guide
(8192 clocks)
3.9
See the Selector Guide
(4096 clocks)
1.9
See the Selector Guide
(256 clocks)
0.1
OUT2, OUT3 Active
Timeout Period
See the Selector Guide
(16,384 clocks)
7.8
ms
See the Selector Guide
(8192 clocks)
3.9
See the Selector Guide
(4096 clocks)
1.9
See the Selector Guide
(256 clocks)
0.1
Output Low Level I
SINK
= 3mA 0.1 0.2 V
Propagation Time
OUT1, 5% below threshold 5 10 20 µs
OUT2/OUT3, 5% below threshold 2 4 8 µs