Electrical characteristics – Rainbow Electronics MAX1625 User Manual
Page 4
mA
MAX1624/MAX1625
High-Speed Step-Down Controllers with
Synchronous Rectification for CPU Power
4
_______________________________________________________________________________________
R
FREQ
= 33.3k
Ω
R
FREQ
= 20k
Ω
V
CC
= V
DD
= 5.5V,
FB overdrive = 200mV
Falling FB, 1% hysteresis with respect to V
REF
V
CC
rising edge, 1% hysteresis
Rising FB, 1% hysteresis with respect to V
REF
V
CC
= V
DD
R
FREQ
= 200k
Ω
Operating mode
V
CC
= V
DD
= 5.5V, FB overdrive = 200mV,
operating or standby mode
MAX1624, over line and load
No load
CONDITIONS
510
600
690
Standby mode
800
1000
1200
Switching Frequency
6
8
10
kHz
80
100
120
%
-8
-6
-4
PWROK Trip Level
±2.5
3
V
CC
Supply Current
V
3.9
4.3
V
4.5
5.5
Input Voltage Range
Input Undervoltage Lockout
%
±2.5
FB Accuracy
mA
0.4
mA
0.2
V
DD
Supply Current
V
3.447
3.5
3.553
Reference Voltage
UNITS
MIN
TYP
MAX
PARAMETER
MAX1625
FB Set Voltage
BST - LX = 4.5V
R
FREQ
= 20k
Ω
V
DD
= 4.5V
Ω
0.7
2
%
84
90
Ω
0.7
2
Maximum Duty Cycle
DL On-Resistance
DH On-Resistance
Current-Limit Trip Voltage
mV
70
100
130
ELECTRICAL CHARACTERISTICS
(V
DD
= V
CC
= D4 = +5V, PGND = AGND = D0–D3= 0V, R
FREQ
= 33.3k
Ω
,
T
A
= -40°C to +85°C
, unless otherwise noted.) (Note 4)
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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