MIC2570
Micrel, Inc.
Absolute Maximum Ratings
Supply Voltage (V
IN
) ...................................................... 18V
Switch Voltage (V
SW
) .................................................... 36V
Switch Current (I
SW
) ........................................................ 1A
Sync Voltage (V
SYNC
) ......................................–0.3V to 15V
Storage Temperature (T
A
)......................... –65°C to +150°C
SOIC Power Dissipation (P
D
) .................................. 400mW
Operating Ratings
Supply Voltage (V
IN
) ..................................... +1.3V to +15V
Ambient Operating Temperature (T
A
) ......... –40°C to +85°C
Junction Temperature (T
J
) ........................ –40°C to +125°C
SOIC Thermal Resistance
(θ
JA
) ............................ 140°C/W
Electrical Characteristics
V
IN
= 2.5V; T
A
= 25°C,
bold
indicates –40°C ≤ T
A
≤ 85°C; unless noted
Parameter
Condition
Input Voltage
Quiescent Current
Fixed Feedback Voltage
Startup guaranteed, I
SW
= 100mA
Output switch off
MIC2570-1; V
2.85V pin
= V
OUT
, I
SW
= 100mA
MIC2570-1; V
3.3V pin
= V
OUT
, I
SW
= 100mA
MIC2570-1; V
5V pin
= V
OUT
, I
SW
= 100mA
MIC2570-2, [adj. voltage versions]
Min
1.3
130
2.7
3.14
4.75
208
2.85
3.30
5.00
220
6
65
75
120
6
6
6
25
0.35
250
450
450
1
20
36
0.7
35
1.1
V
FB
< V
REF
, I
SW
= 100mA
67
3.0
3.47
5.25
232
Typ
Max
15
Units
V
µA
V
V
V
mV
mV
mV
mV
mV
µA
µA
µA
nA
%/V
mV
mV
mV
µA
kHz
V
V
µs
A
%
Reference Voltage
Comparator Hysteresis
Output Hysteresis
MIC2570-2, [adj. voltage versions], I
SW
= 100mA,
Note 1
MIC2570-1; V
2.85V pin
= V
OUT
, I
SW
= 100mA
MIC2570-1; V
3.3V pin
= V
OUT
, I
SW
= 100mA
MIC2570-1; V
5V pin
= V
OUT
, I
SW
= 100mA
Feedback Current
Reference Line Regulation
Switch Saturation Voltage
MIC2570-1; V
2.85V pin
= V
OUT
MIC2570-1; V
3.3V pin
= V
OUT
MIC2570-1; V
5V pin
= V
OUT
MIC2570-2 [adj. voltage versions]; V
FB
= 0V
V
IN
= 1.3V, I
SW
= 300mA
V
IN
= 1.5V, I
SW
= 800mA
V
IN
= 3.0V, I
SW
= 800mA
1.5V ≤ V
IN
≤ 15V
Switch Leakage Current
Oscillator Frequency
Maximum Output Voltage
Sync Threshold Voltage
Switch On-Time
Currrent Limit
Duty Cycle
Note 1:
Output switch off, V
SW
= 36V
MIC2570-1, -2; I
SW
= 100mA
General Note:
Devices are ESD protected; however, handling precautions are recommended.
Measured using comparator trip point.
August 2007
3
MIC2570
MICREL [ MICREL SEMICONDUCTOR ]
