MAX1637 Datasheet, PDF (3/20 Pages) Maxim Integrated Products – Miniature, Low-Voltage, Precision Step-Down Controller

Miniature, Low-Voltage,
Precision Step-Down Controller
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.)
PARAMETER
CONDITIONS
OVERVOLTAGE PROTECTION
Overvoltage Trip Threshold
FB, with respect to regulation point
Overvoltage Fault Propagation Delay FB to DL delay, 22mV overdrive, C_GATE = 2000pF
Output Undervoltage Lockout Threshold % of nominal output
Output Undervoltage Lockout Delay From shutdown or power-on-reset state
INPUTS AND OUTPUTS
Logic Input Voltage High
SHDN, SKIP, SYNC
Logic Input Voltage Low
SHDN, SKIP, SYNC
Logic Input Bias Current
Pin at GND or V_CC
Current-Sense Input Leakage Current
CSH = CSL = 5V, V_CC = V_GG = GND,
either CSH or CSL input
MIN TYP MAX UNITS
4
7
10
%
1.25
µs
60
70
80
%
6144
clocks
2.4
V
0.8
V
-1
1
µA
10
µA
Gate Driver Sink/Source Current
Gate Driver On-Resistance
DH or DL forced to 2V
High or low, DH or DL
1
A
7
Ω
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)
PARAMETER
SMPS CONTROLLER
Input Voltage Range
Output Voltage
Output Adjustment Range
Current-Limit Threshold
Power Consumption
INTERNAL REFERENCE
V_CC Undervoltage Lockout Threshold
V_GG Undervoltage Lockout Threshold
OSCILLATOR
Oscillator Frequency
SYNC Input Pulse Width High
SYNC Input Pulse Width Low
SYNC Input Rise/Fall Time
SYNC Input Frequency Range
CONDITIONS
V_CC, V_GG
FB tied to V_OUT, 0mV < (CSH - CSL) < 80mV,
includes line and load regulation
V_CC = 5V
V_CC = 3.3V
CSH > CSL
V_CC = V_GG = 5V, output not switching
V_CC = V_GG = 3.3V, output not switching
Rising edge, hysteresis = 15mV
Rising edge, hysteresis = 15mV
SYNC = V_CC
SYNC = GND
MIN TYP MAX
3.15
1.080
V_REF
V_REF
70
5.5
1.120
5.5
3.6
130
2.5
1.75
2.80
3.05
2.80
3.05
262
338
170
230
200
200
200
240
340
UNITS
V
V
V
mV
mW
mW
V
V
kHz
ns
ns
ns
kHz
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