MAX1637
Miniature, Low-Voltage,
Precision Step-Down Controller
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, V
CC
= V
GG
= 5V, SYNC = V
CC
, I
REF
= 0mA, T
A
= 0°C to +85°C, unless otherwise noted. Typical values are at
T
A
= +25°C.)
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, V
CC
= V
GG
= 5V, SYNC = V
CC
, I
REF
= 0mA, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
High or low, DH or DL
DH or DL forced to 2V
CSH = CSL = 5V, V
CC
= V
GG
= GND,
either CSH or CSL input
FB to DL delay, 22mV overdrive, C
GATE
= 2000pF
FB, with respect to regulation point
From shutdown or power-on-reset state
Pin at GND or V
CC
SHDN, SKIP, SYNC
% of nominal output
SHDN, SKIP, SYNC
CONDITIONS
Ω7Gate Driver On-Resistance
A1Gate Driver Sink/Source Current
µA10Current-Sense Input Leakage Current
µA-1 1Logic Input Bias Current
V0.8Logic Input Voltage Low
V2.4Logic Input Voltage High
µs1.25Overvoltage Fault Propagation Delay
%4 7 10Overvoltage Trip Threshold
clocks6144Output Undervoltage Lockout Delay
%60 70 80Output Undervoltage Lockout Threshold
UNITSMIN TYP MAXPARAMETER
FB tied to V
OUT
, 0mV < (CSH - CSL) < 80mV,
includes line and load regulation
SYNC = GND
V
CC
, V
GG
SYNC = V
CC
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 15mV
V
CC
= 3.3V
V
CC
= V
GG
= 3.3V, output not switching
V
CC
= 5V
V
CC
= V
GG
= 5V, output not switching
CSH > CSL
CONDITIONS
kHz240 340SYNC Input Frequency Range
ns200SYNC Input Rise/Fall Time
ns200SYNC Input Pulse Width Low
ns200SYNC Input Pulse Width High
kHz
170 230
Oscillator Frequency
262 338
V2.80 3.05V
GG
Undervoltage Lockout Threshold
V2.80 3.05V
CC
Undervoltage Lockout Threshold
mW1.75
Power Consumption
mW2.5
mV70 130Current-Limit Threshold
V1.080 1.120Output Voltage
V3.15 5.5Input Voltage Range
V
REF
3.6
Output Adjustment Range V
V
REF
5.5
UNITSMIN TYP MAXPARAMETER
OVERVOLTAGE PROTECTION
INPUTS AND OUTPUTS
SMPS CONTROLLER
INTERNAL REFERENCE
OSCILLATOR
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