Rainbow Electronics MAX889 User Manual
Page 2
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= V
SHDN
= +5V, capacitors from Table 1, T
A
= 0
°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25
°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND .................................................................-0.3V to +6V
FB, SHDN, CAP+ to GND ............................-0.3V to (V
IN
+ 0.3V)
AGND to GND .......................................................-0.3V to +0.3V
OUT to GND .............................................................-6V to +0.3V
CAP- to GND ............................................(V
OUT
- 0.3V) to +0.3V
Continuous Output Current ...............................................250mA
Output Short-Circuit Duration ........................................Indefinite
Continuous Power Dissipation (T
A
= +70
°C)
8-Pin SO (derate 5.88mW/
°C above +70°C)...............471mW
Operating Temperature Range...........................-40
°C to +85°C
Junction Temperature ......................................................+150
°C
Storage Temperature Range .............................-65
°C to +150°C
Lead Temperature (soldering, 10s) ................................+300
°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Supply Voltage Range
V
IN
R
LOAD
= 100
Ω
2.7
5.5
V
Output Voltage Range
V
OUT
R
LOAD
= 100
Ω
-2.5
-V
IN
V
I
OUT(MAX)1
V
IN
= 5V, V
OUT
= -3.3V
200
Maximum Output Current
I
OUT(MAX)2
V
IN
= 3.3V, V
OUT
= -2.5V
145
mA
MAX889R
6
12
MAX889S
12
24
Quiescent Supply
Current (Free-Run Mode)
I
Q(FREE-RUN)
No load, V
FB
=
V
IN
MAX889T
24
48
mA
MAX889R
3.3
7
MAX889S
5.5
12
Quiescent Supply
Current (Regulated Mode)
I
Q(REGULATED)
No load, V
OUT
regulated to
-3.3V
MAX889T
11
22
mA
Shutdown Supply Current
I
SHDN
V
SHDN
= 0
0.1
50
µA
Open-Loop Output
Resistance (Free-Run Mode)
R
O
V
FB
= V
IN
2.0
4.5
Ω
Output Resistance
R
O(REG1)
V
OUT
regulated to -3.3V
0.05
Ω
SHDN, FB Input Bias Current
±1
µA
FB Input Offset Voltage
I
LOAD
= 0
±3
±35
mV
Load Regulation
I
OUT
= 0 to 200mA
10
mV
IN Undervoltage Lockout
Threshold
V
IN
rising (30mV hysteresis)
2.3
2.6
V
SHDN Logic High
V
IH
0.7 x V
IN
SHDN Logic Low
V
IL
V
IN
= +2.7V to +5.5V
0.3 x V
IN
V
MAX889R
0.375
0.5
0.62
MAX889S
0.75
1
1.25
Switching Frequency
f
OSC
MAX889T
1.5
2
2.5
MHz
Thermal Shutdown Threshold
Junction temperature rising
(15
°C hysteresis)
160
°C