MAX1624 Datasheet, PDF (4/24 Pages) Maxim Integrated Products – High-Speed Step-Down Controllers with Synchronous Rectification for CPU Power

High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
ELECTRICAL CHARACTERISTICS
(V_DD = V_CC = D4 = +5V, PGND = AGND = D0–D3= 0V, R_FREQ = 33.3kΩ, T_A = -40°C to +85°C, unless otherwise noted.) (Note 4)
PARAMETER
Input Voltage Range
Input Undervoltage Lockout
V_CC Supply Current
V_DD Supply Current
CONDITIONS
V_CC = V_DD
V_CC rising edge, 1% hysteresis
V_CC = V_DD = 5.5V,
Operating mode
FB overdrive = 200mV _{Standby mode}
V_CC = V_DD = 5.5V, FB overdrive = 200mV,
operating or standby mode
MIN TYP MAX UNITS
4.5
5.5
V
3.9
4.3
V
3
mA
mA
0.4
0.2
mA
Reference Voltage
FB Accuracy
FB Set Voltage
PWROK Trip Level
Switching Frequency
Maximum Duty Cycle
DH On-Resistance
DL On-Resistance
Current-Limit Trip Voltage
No load
3.447 3.5 3.553
V
MAX1624, over line and load
±2.5
%
MAX1625
±2.5
%
Rising FB, 1% hysteresis with respect to V_REF
-8
-6
-4
%
Falling FB, 1% hysteresis with respect to V_REF
6
8
10
R_FREQ = 20kΩ
800 1000 1200
R_FREQ = 33.3kΩ
R_FREQ = 200kΩ
510
600
690
kHz
80
100
120
R_FREQ = 20kΩ
BST - LX = 4.5V
84
90
%
0.7
2
Ω
V_DD = 4.5V
0.7
2
Ω
70
100
130
mV
Note 1: FB accuracy is 100% tested at FB = 3.5V (code 10000) with V_CC = V_DD = 4.5V to 5.5V and CSH - CSL = 0mV to 80mV. The
other DAC codes are tested at the major transition points with V_CC = V_DD = 5V and CSH - CSL = 0. FB accuracy at other
DAC codes over line and load is guaranteed by design.
Note 2: FB set voltage is 100% tested with V_CC = V_DD = 4.5V to 5.5V and CSH - CSL = 0mV to 80mV.
Note 3: AC load regulation sets the AC loop gain, to make tradeoffs between output filter capacitor size and transient response,
and has only a slight effect on DC accuracy or DC load-regulation error.
Note 4: Specifications from 0°C to -40°C are not production tested.
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