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MAX889RESA-T |MAX889RESATMAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889SESA+MAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889SESA+TMAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889SESA-T |MAX889SESATMAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889TESA+ |MAX889TESAMAXIMN/a1600avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889TESA+TMAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889RESA+ |MAX889RESAMAXIMN/a45avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump
MAX889RESA+TMAXIMN/a1500avaiHigh-Frequency, Regulated, 200mA, Inverting Charge Pump


MAX889TESA+ ,High-Frequency, Regulated, 200mA, Inverting Charge PumpELECTRICAL CHARACTERISTICS(V = V = +5V, capacitors from Table 1, T = 0°C to +85°C, unless otherwise ..
MAX889TESA+T ,High-Frequency, Regulated, 200mA, Inverting Charge PumpApplicationsTypical Operating Circuit Pin ConfigurationINPUT +2.7V TO +5.5VTOP VIEWON INREGULATED I ..
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MAX8901BETA+T ,Highest Efficiency Supply for 2 to 6 Series WLEDs in a 2mm x 2mm TDFN PackageElectrical Characteristics(V = V = V = 3.6V, V = V = 0V, COMP, CS, and LX are unconnected, T = -40° ..
MAX8902AATA+T ,Low-Noise 500mA LDO Regulators in a 2mm x 2mm TDFN PackageElectrical Characteristics(V = V = 5V, OUTS = OUT, circuit of Figure 2 (MAX8902A) and Figure 3 (MAX ..
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MB88101APF ,A/D Converter (With 4-channel Input at 12-bit Resolution)FEATURES• 4-channel analog input• One analog input channel selectable for conversion by external co ..
MB88141 ,D/A Converter for Digital Tuning (With Built-in OP Amp and I/O Expander)FUJITSU SEMICONDUCTORDS04-13211-3EDATA SHEETGeneral Purpose Linear IC’s General Purpose ConvertersC ..
MB88141A ,D/A Converter for Digital Tuning (Compatible with I 2 C Bus)FUJITSU SEMICONDUCTORDS04-13213-1EDATA SHEETLinear IC ConverterCMOSD/A Converter for Digital Tuning ..
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MAX889RESA+-MAX889RESA+T-MAX889RESA-T-MAX889SESA+-MAX889SESA+T-MAX889SESA-T-MAX889TESA+-MAX889TESA+T
High-Frequency, Regulated, 200mA, Inverting Charge Pump
General Description
The MAX889 inverting charge pump delivers a regulated
negative output voltage at loads of up to 200mA. The
device operates with inputs from 2.7V to 5.5V to produce
an adjustable, regulated output from -2.5V to -VIN.
The MAX889 is available with an operating frequency of
2MHz (T version), 1MHz (S version), or 0.5MHz (R ver-
sion). The higher switching frequency devices allow the
use of smaller capacitors for space-limited applica-
tions. The lower frequency devices have lower quies-
cent current.
The MAX889 also features a 0.1µA logic-controlled
shutdown mode and is available in an 8-pin SO pack-
age. An evaluation kit, MAX889SEVKIT, is available.
________________________Applications

TFT Panels
Hard Disk Drives
Camcorders
Digital Cameras
Measurement Instruments
Battery-Powered Applications
Features
200mA Output CurrentUp to 2MHz Switching FrequencySmall Capacitors (1µF)+2.7V to +5.5V Input Voltage RangeAdjustable Regulated Negative Output
(-2.5V to -VIN)
0.1µA Logic-Controlled ShutdownLow 0.05ΩOutput Resistance (in regulation)Soft-Start and Foldback Current LimitedShort-Circuit and Thermal Shutdown Protected 8-Pin SO Package
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump

SHDN
OUTCAP-
AGNDCAP+
GND
TOP VIEW
MAX889
Pin Configuration

MAX889
INPUT +2.7V TO +5.5V
REGULATED
NEGATIVE
OUTPUT
(UP TO -1 × VIN,
UP TO 200mA)
OUT
GNDAGND
CAP+
OFFSHDN
CAP-ypical Operating Circuit
19-1774; Rev 0; 7/00
Ordering Information
PART
TEMP.
RANGE
PIN-
PACKAGE
SWITCHING
FREQUENCY

MAX889TESA-40°C to +85°C8 SO 2MHz
MAX889SESA-40°C to +85°C8 SO 1MHz
MAX889RESA-40°C to +85°C8 SO 0.5MHz
EVALUATION KITAVAILABLE
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= VSHDN= +5V, capacitors from Table 1, TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +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 (VIN+ 0.3V)
AGND to GND.......................................................-0.3V to +0.3V
OUT to GND.............................................................-6V to +0.3V
CAP- to GND............................................(VOUT- 0.3V) to +0.3V
Continuous Output Current...............................................250mA
Output Short-Circuit Duration........................................Indefinite
Continuous Power Dissipation (TA= +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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Supply Voltage RangeVINRLOAD = 100Ω2.75.5V
Output Voltage RangeVOUTR LOAD = 100Ω-2.5-VINV
IOUT(MAX)1VIN = 5V, VOUT = -3.3V200Maximum Output CurrentIOUT(MAX)2VIN = 3.3V, VOUT = -2.5V145mA
MAX889R612
MAX889S1224Quiescent Supply
Current (Free-Run Mode)IQ(FREE-RUN)No load, VFB = VIN
MAX889T2448
MAX889R3.37
MAX889S5.512Quiescent Supply
Current (Regulated Mode)IQ(REGULATED)No load, VOUT regulated to
-3.3V
MAX889T1122
Shutdown Supply CurrentI SHDNV SHDN = 00.150μA
Open-Loop Output
Resistance (Free-Run Mode)ROVFB = VIN2.04.5Ω
Output ResistanceRO(REG1)VOUT regulated to -3.3V0.05Ω
SHDN, FB Input Bias Current±1μA
FB Input Offset VoltageILOAD = 0±3±35mV
Load RegulationIOUT = 0 to 200mA10mV
IN Undervoltage Lockout
ThresholdVIN rising (30mV hysteresis)2.32.6V
SHDN Logic HighVIH0.7 x VIN
SHDN Logic LowVILVIN = +2.7V to +5.5V0.3 x VINV
MAX889R0.3750.50.62
MAX889S0.7511.25Switching FrequencyfOSC
MAX889T1.522.5
MHz
Thermal Shutdown ThresholdJunction temperature rising
(15°C hysteresis)160°C
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
Note 1:
Specifications to -40°C are guaranteed by design, not production tested.
ELECTRICAL CHARACTERISTICS

(VIN= VSHDN= +5V, capacitors from Table 1, TA= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINMAXUNITS

Supply Voltage RangeVINRLOAD = 100Ω2.75.5V
Output Voltage RangeVOUTR LOAD = 100Ω-2.5-VINV
IOUT(MAX)1VIN = 5V, VOUT = -3.3V200Maximum Output CurrentIOUT(MAX)2VIN = 3.3V, VOUT = -2.5V145mA
MAX889R12
MAX889S24Quiescent Supply
Current (Free-Run Mode)IQ(FREE-RUN)No load, VFB = VIN
MAX889T48
MAX889R7
MAX889S12Quiescent Supply
Current (Regulated Mode)IQ(REGULATED)No load, VOUT regulated to
-3.3V
MAX889T22
Shutdown Supply CurrentI SHDNV SHDN = 050μA
Open-Loop Output
Resistance (Free-Run Mode)ROVFB = VIN4.5Ω
SHDN FB Input Bias Current±1μA
FB Input Offset VoltageILOAD = 0±35mV
IN Undervoltage Lockout
ThresholdVIN rising (30mV hysteresis)2.32.6V
SHDN Logic HighVIH0.7 x V IN
SHDN Logic LowVILVIN = +2.7V to +5.5V0.3 x VINV
MAX889R0.3750.62
MAX889S0.751.25Switching FrequencyfOSC
MAX889T1.52.5
MHz
Typical Operating Characteristics

(Circuit of Figure 1, VIN= VSHDN= +5V, capacitors from Table 1, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENT

MAX889 toc01
OUTPUT LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
MAX889T
MAX889S
MAX889R
MAX889R
OUTPUT RIPPLE
vs. LOAD CURRENT vs. COUT

MAX889 toc02
LOAD CURRENT (mA)
OUTPUT RIPPLE (mV)15020050100250300350
COUT = 22μF
COUT = 47μF
COUT = 10μF
MAX889S
OUTPUT RIPPLE
vs. LOAD CURRENT vs. COUT

MAX889 toc03
LOAD CURRENT (mA)
OUTPUT RIPPLE (mV)15020050100250300350
COUT = 4.7μF
COUT = 22μF
COUT = 10μF
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
10050150200250300350
MAX889T
OUTPUT RIPPLE
vs. LOAD CURRENT vs. COUT

MAX889 toc04
LOAD CURRENT (mA)
OUTPUT RIPPLE (mV)
COUT = 2.2μF
COUT = 4.7μF
COUT = 10μF
EFFICIENCY vs. LOAD CURRENT
(VIN = 5V, VOUT = -3.3V)
MAX889 toc05
LOAD CURRENT (mA)
EFFICIENCY (%)
MAX889T
MAX889R
MAX889S
EFFICIENCY vs. LOAD CURRENT
(VIN = 3.3V, VOUT = -2.5V)
MAX889 toc06
LOAD CURRENT (mA)
EFFICENCY (%)
MAX889R
MAX889T
MAX889S
Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN= VSHDN= +5V, capacitors from Table 1, TA= +25°C, unless otherwise noted.)
MAX889S
LOAD-TRANSIENT RESPONSE

MAX889 toc10
40μs/div
20 TO 200mA LOAD STEP
CIRCUIT OF FIGURE 4
A: IOUT, 100mA/div
MAX889S
LINE-TRANSIENT RESPONSE

MAX889 toc11
40μs/div
IOUT = 200mA
CIRCUIT OF FIGURE 4
A: VIN, 2V/div
MAX889S
STARTUP AND SHUTDOWN

MAX889 toc12
2ms/div
IOUT = 200mA
A: VOUT, 1V/div
B: IIN, 100mA/div
FREE-RUN OUTPUT RESISTANCE
vs. INPUT VOLTAGE
MAX889 toc07
INPUT VOLTAGE (V)
OUT
FREE-RUN OUTPUT RESISTANCE
vs. TEMPERATURE
MAX889 toc08
TEMPERATURE (°C)
OUT
QUIESCENT SUPPLY CURRENT
vs. INPUT VOLTAGE (REGULATED MODE)
MAX889 toc09
INPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)
MAX889T
MAX889S
MAX889R
VOUT = -2.5V
MAX889
High-Frequency, Regulated,
200mA, Inverting Charge Pump
Pin Description
PINNAMEFUNCTION
INPower-Supply Positive Voltage InputCAP+Positive Terminal of Flying CapacitorGNDPower GroundCAP-Negative Terminal of Flying CapacitorOUTInverting Charge-Pump OutputSHDNShutdown Control Input. Drive SHDN low to shut down the MAX889. Connect SHDN to IN for
normal operation.
7FBFeedback Input. Connect FB to a resistor-divider from IN (or other positive reference voltage
source) to OUT for regulated output voltages. Connect to IN for free-run mode.AGNDAnalog Ground
Detailed Description

The MAX889 high-current regulated charge-pump DC-
DC inverter provides up to 200mA. It features the high-
est available output current while using small
capacitors (Table 1). The three versions available differ
in their switching frequencies (fOSC)—MAX889R/
MAX889S/MAX889T with fOSC= 500kHz/1MHz/2MHz,
respectively. Higher frequencies allow the use of small-
er components (Table 1). Even smaller capacitor values
than those listed in Table 1 are suitable when the
devices are loaded at less than their rated output cur-
rent. Designed specifically for compact applications, a
complete regulating circuit requires only three small
capacitors and two resistors, Figure 1. In addition, the
MAX889 includes soft-start, shutdown control, short-cir-
cuit, and thermal protection.
The oscillator, control circuitry, and four power MOSFET
switches are included on-chip. The charge pump runs
continuously at the operating frequency. During one-half
of the oscillator period, switches S1 and S2 close
(Figure 2), charging the transfer capacitor (CFLY) to the
input voltage (CAP- = GND, CAP+ = IN). During the
other half cycle, switches S3 and S4 close (Figure 3),
transferring the charge on CFLYto the output capacitor
(CAP+ = GND, CAP- = OUT).
Voltage Regulation

Voltage regulation is achieved by controlling the flying-
capacitor charging rate. The MAX889 controls the
charge on CFLYby modulating the gate drive to S1
(Figure 2) to supply the charge necessary to maintain
output regulation. When the output voltage droops,
CFLYcharges higher due to increased gate drive. Since
the device switches continuously, the regulation
scheme minimizes output ripple, and the output noise
spectrum contains well-defined frequency components.
Feedback voltage is sensed with a resistor-divider
between an externally supplied positive reference or
the supply voltage and the negative inverted output.
The feedback loop servos FB to GND. The effective
output impedance in regulation is 0.05Ω. The output
remains in regulation until dropout is reached. Dropout
depends on the output voltage setting and load current
(see Output Voltage vs. Load Current in Typical
Operating Characteristics).
Free-Run Mode
(Unregulated Voltage Inverter)

The MAX889 may be used in an unregulated voltage
inverter mode that does not require external feedback
resistors, minimizing board space. Connecting FB to IN
places the MAX889 in free-run mode. In this mode, the
charge pump operates to invert directly the input sup-
ply voltage (VOUT= -(VIN- IOUTx RO)). Output resis-
tance is typically 2Ωand can be approximated by the
following equation:≅[1 / (fOSCx CFLY) ] + 2RSW+
4ESRCFLY+ ESRCOUT
The first term is the effective resistance of an ideal
switched-capacitor circuit (Figures 2 and 3), and RSW
is the sum of the charge pump’s internal switch resis-
tances (typically 0.8Ωat VIN= 5V). The last two terms
take into consideration the equivalent series resistance
MAX889
(ESR) of the flying and output capacitors. The typical
output impedance is more accurately determined from
the Typical Operating Characteristics.
Current Limit and Soft-Start

The MAX889 features a foldback current-limit/soft-start
scheme that allows it to limit inrush currents during
startup, overload, and output short-circuit conditions.
Additionally, it permits a safe, timed recovery from fault
conditions. This protects the MAX889 and prevents
low-current or higher output impedance input supplies
(such as alkaline cells) from being overloaded at start-
up or short-circuit conditions.
The MAX889 features two current-limit/soft-start levels
with corresponding response to rising and falling out-
put voltage thresholds of -0.6V and -1.5V. When the
falling output voltage crosses -1.5V, such as during an
overload condition, the input current is immediately lim-
ited to 400mA by weakening the charge-pump switch-
es. When the falling output voltage crosses -0.6V, such
as during a short-circuit condition, the MAX889 further
weakens the charge-pump switches, immediately limit-
ing input current to 200mA.
During startup or short-circuit recovery, the MAX889
limits input current to 200mA with charge-pump switch-
es at their weakest level. Rising output voltage crossing
-0.6V initiates a 2ms timer, after which the MAX889
increases switch strength to the next level. The rising
output voltage crossing -1.5V initiates a 2ms timer, after
which the MAX889 provides full-strength operation.
Shutdown

When SHDN(a CMOS-compatible input) is driven low,
the MAX889 enters 0.1µA shutdown mode. Charge-
pump switching halts. Connect SHDNto IN or drive
high for normal operation.
Thermal Shutdown

The MAX889 features thermal shutdown with hysteresis
for added protection against fault conditions. When the
die temperature exceeds 160°C, the internal oscillator
stops, suspending device operation. The MAX889
resumes operation when the die temperature falls 15°C.
This prevents the device from rapidly oscillating around
the temperature trip point.
Applications Information
Resistor Selection
(Setting the Output Voltage)

The accuracy of VOUTdepends on the accuracy of the
voltage biasing R1 in Figure 1. Use a separate refer-
ence voltage if greater accuracy than provided by VIN
is desired (Figure 4). Keep the feedback node as small
as possible, with resistors mounted close to the FB pin.
High-Frequency, Regulated,
200mA, Inverting Charge Pump

Figure 1. Typical Application Circuit.
MAX889T
INPUT
5.0V
OUTPUT
-3.3V
CIN
4.7μF
COUT
4.7μF
CFLY
1μF
100k
66.5k
OUT
GND
CAP+
OFF
SHDN
CAP-
Figure 3. Transferring Charge on CFLYto COUT
OUT
COUTCFLY
FOSC
CAP+
CAP-
Figure 2. Charging CFLY
OUT
COUTCFLYCAP+
CAP-
FOSC
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