Datasheet MAX889 (Maxim) - 3

High-Frequency, Regulated, 200mA, Inverting Charge Pump MAX889 ELECTRICAL CHARACTERISTICS
(VIN = V SHDN = +5V, capacitors from Table 1,
TA
=
-40
°
C to +85
°
C
, unless otherwise noted.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN MAX UNITS
Supply Voltage Range VIN RLOAD = 100Ω 2.7 5.5 V Output Voltage Range VOUT R LOAD = 100Ω -2.5 -VIN V IOUT(MAX)1 VIN = 5V, VOUT = -3.3V 200 Maximum Output Current mA IOUT(MAX)2 VIN = 3.3V, VOUT = -2.5V 145 MAX889R 12 Quiescent Supply IQ(FREE-RUN) No load, VFB = VIN MAX889S 24 mA Current (Free-Run Mode) MAX889T 48 MAX889R 7 Quiescent Supply No load, V I OUT regulated to Q(REGULATED) MAX889S 12 mA Current (Regulated Mode) -3.3V MAX889T 22 Shutdown Supply Current I SHDN V SHDN = 0 50 µA Open-Loop Output RO VFB = VIN 4.5 Ω Resistance (Free-Run Mode) SHDN FB Input Bias Current ±1 µA FB Input Offset Voltage ILOAD = 0 ±35 mV IN Undervoltage Lockout VIN rising (30mV hysteresis) 2.3 2.6 V Threshold SHDN Logic High VIH 0.7 x V IN VIN = +2.7V to +5.5V V SHDN Logic Low VIL 0.3 x VIN MAX889R 0.375 0.62 Switching Frequency fOSC MAX889S 0.75 1.25 MHz MAX889T 1.5 2.5
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(Circuit of Figure 1, VIN = V SHDN = +5V, capacitors from Table 1, TA = +25°C, unless otherwise noted.)
MAX889R MAX889S OUTPUT VOLTAGE OUTPUT RIPPLE OUTPUT RIPPLE vs. LOAD CURRENT vs. LOAD CURRENT vs. COUT vs. LOAD CURRENT vs. COUT
-3.25 40 40 -3.26 COUT = 4.7µF MAX889 toc01 MAX889 toc02 MAX889 toc03 -3.27 30 30 MAX889T COUT = 10µF COUT = 10µF -3.28 MAX889S C -3.29 20 OUT = 22µF 20 -3.30 COUT = 22µF OUTPUT VOLTAGE (V) OUTPUT RIPPLE (mV) OUTPUT RIPPLE (mV) -3.31 10 10 C -3.32 MAX889R OUT = 47µF -3.33 0 0 0 200 400 600 800 0 50 100 150 200 250 300 350 0 50 100 150 200 250 300 350 OUTPUT LOAD CURRENT (mA) LOAD CURRENT (mA) LOAD CURRENT (mA)
_______________________________________________________________________________________ 3