MAXIM MAX1935

19-2599; Rev 0; 10/02
500mA, Low-Voltage Linear Regulator
in Tiny QFN
An internal PMOS pass transistor allows low 210µA
supply current, making this device ideal for portable
equipment such as personal digital assistants (PDAs),
cellular phones, cordless phones, and other equipment, including base stations and docking stations.
Other features include an active-low, power-OK output
that indicates when the output is out of regulation, a
0.02µA shutdown mode, short-circuit protection, and
thermal-shutdown protection. The MAX1935 comes in a
tiny 1.9W, 8-pin 3mm x 3mm thin QFN package.
Features
♦ Guaranteed 500mA Output Current
♦ Output Down to 0.8V
♦ Low 175mV Dropout at 500mA
♦ ±1.5% Output Voltage Accuracy
Preset at 1.5V
Adjustable from 0.8V to 4.5V
♦ Power-OK Output
♦ Low 210µA Ground Current
♦ 0.02µA Shutdown Current
♦ Thermal-Overload Protection
♦ Output Current Limit
♦ Tiny 1.9W, 8-Pin 3mm x 3mm Thin QFN Package
Ordering Information
Applications
Notebook Computers
Cellular and Cordless Telephones
PDAs
Palmtop Computers
PART
TEMP RANGE
PIN-PACKAGE
MAX1935ETA*
-40°C to +85°C
8 Thin QFN
3mm x 3mm
MAX1935ETA15*
-40°C to +85°C
8 Thin QFN
3mm x 3mm
*Contact factory for preset output voltages.
Base Stations
Selector Guide
USB Hubs
Docking Stations
OUTPUT
VOLTAGE
PART
MAX1935ETA
Adjustable
ADB
1.5V
ADB
MAX1935ETA15
Pin Configuration
Typical Operating Circuit
RPOK
100kΩ
VOUT
0.8V TO 4.5V
COUT
10µF
R1
MAX1935
IN
TOP VIEW
OUT
POK
TO µC
VIN
2.25V TO 5.5V
TOP MARK
SET
CIN
1µF
IN
1
8
IN
2
7
OUT
POK
3
6
SET
SHDN
4
5
GND
MAX1935
OUT
R2
ON
SHDN
GND
THIN QFN
3mm x 3mm
OFF
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
MAX1935
General Description
The MAX1935 low-dropout linear regulator operates
from a 2.25V to 5.5V supply and delivers a guaranteed
500mA load current with low 175mV dropout. The highaccuracy (±1.5%) output voltage is preset at an internally trimmed voltage or can be adjusted from 0.8V to
4.5V with an external resistive-divider.
MAX1935
500mA, Low-Voltage Linear Regulator
in Tiny QFN
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, POK, SET to GND ...................................-0.3V to +6V
OUT to GND ................................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA = +70°C)
8-Pin Thin QFN (derate 24.4mW/°C above +70°C) .......1.95W
Operating Temperature .......................................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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.
ELECTRICAL CHARACTERISTICS
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = 0°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.)
PARAMETER
Input Voltage
Input Undervoltage Lockout
Output Voltage Accuracy
(Preset Mode)
SYMBOL
CONDITIONS
VIN
VUVLO
VOUT
VSET
Maximum Output Current
IOUT
Short-Circuit Current Limit
ILIM
Ground-Pin Current
ISET
IQ
Dropout Voltage (Note 1)
MAX
5.50
V
2
2.15
V
2.25
1.85
TA = +25°C, IOUT = 100mA
-1.5
+1.5
TA = +25°C, IOUT = 1mA to 500mA
-2.5
+2.5
-3
+3
TA = 0°C to +85°C, IOUT = 1mA to 500mA,
VIN > VOUT + 0.5V
0.8
4.5
TA = +25°C, IOUT = 100mA
788
812
TA = +25°C, IOUT = 1mA to 500mA
780
820
TA = 0°C to +85°C, IOUT = 1mA to 500mA,
VIN > VOUT + 0.5V
774
800
VOUT = 0V
VSET = 0.8V
V
mV
600
1400
2300
mA
35
80
125
mV
+100
nA
-100
210
IOUT = 500mA
575
600
µA
VOUT = 2.25V
259
400
VOUT = 2.8V
201
350
VOUT = 4V
147
275
0
0.125
%/V
35
ppm/mA
Line Regulation
∆VLNR
VIN from (VOUT + 100mV) to 5.5V, ILOAD = 5mA
Load Regulation
∆VLDR
IOUT = 1mA to 500mA
15.5
10Hz to 1MHz, COUT = 10µF (ESR < 0.1Ω)
300
SHDN = GND, VIN = 5.5V
0.02
Output Voltage Noise
%
mARMS
IOUT = 1mA
IOUT = 500mA
UNITS
826
500
SET Dual Mode™ Threshold
SET Input Bias Current
TYP
Rising, 40mV hysteresis
Adjustable Output Voltage
SET Voltage Threshold
(Adjustable Mode)
MIN
mV
µVRMS
SHUTDOWN
Shutdown Supply Current
SHDN Input Threshold
IOFF
VIH
1.6
0.6
VIL
SHDN Input Bias Current
I SHDN
SHDN = GND or IN
10
Startup Time
tSTART
COUT = 10µF, time from SHDN high to POK high
40
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
5
_______________________________________________________________________________________
100
µA
V
nA
µs
500mA, Low-Voltage Linear Regulator
in Tiny QFN
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = 0°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
5
50
mV
5.5
V
100
nA
96
%
POWER-OK
POK Output Low Voltage
VOL
Operating Voltage Range for
Valid POK Output
Sinking 2mA
Sinking 100µA
1.0
Output High Leakage Current
VPOK = 5.5V
Threshold
Rising edge, referred to VOUT(NOMINAL)
90
93
THERMAL PROTECTION
Thermal-Shutdown Temperature
TSHDN
170
°C
Thermal-Shutdown Hysteresis
∆TSHDN
20
°C
ELECTRICAL CHARACTERISTICS
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
Input Voltage
SYMBOL
CONDITIONS
VIN
MIN
UNITS
2.25
5.50
V
2.15
V
-4
+4
%
0.8
4.5
V
IOUT = 1mA to 500mA
766
834
mV
VUVLO
Rising, 40mV hysteresis
Output Voltage Accuracy
(Preset Mode)
VOUT
IOUT = 1mA to 500mA
Adjustable Output Voltage
SET Voltage Threshold
(Adjustable Mode)
VSET
Maximum Output Current
IOUT
Short-Circuit Current Limit
ILIM
VOUT = 0V
600
ISET
VSET = 0.8V
IQ
IOUT = 1mA
500
SET Dual Mode Threshold
Ground-Pin Current
MAX
1.85
Input Undervoltage Lockout
SET Input Bias Current
TYP
mARMS
2500
mA
35
125
mV
-100
+100
nA
400
µA
5
µA
SHUTDOWN
Shutdown Supply Current
SHDN Input Threshold
SHDN Input Bias Current
IOFF
SHDN = GND, VIN = 5.5V
VIH
2.5V < VIN < 5.5V
VIL
2.5V < VIN < 5.5V
0.6
I SHDN
SHDN = GND or IN
100
1.6
V
nA
_______________________________________________________________________________________
3
MAX1935
ELECTRICAL CHARACTERISTICS (continued)
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT(SETPOINT) + 500mV or VIN = 2.25V whichever is greater, SET = GND, SHDN = IN, TA = -40°C to +85°C, unless otherwise
noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
50
mV
5.5
V
100
nA
97
%
POWER-OK
POK Output Low Voltage
VOL
Sinking 2mA
Operating Voltage Range for
Valid POK Output
Sinking 100µA
1.0
Output High Leakage Current
VPOK = 5.5V
Threshold
Rising edge, referred to VOUT(NOMINAL)
89
Note 1: Dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT and when VIN = VOUT(NOM) + 0.5V.
For 2.25V ≤ VOUT ≤ 4V, dropout voltage limits are linearly interpolated from the values listed. For VOUT < 4V, dropout
voltage limit is equal to the value for VOUT = 4V.
Note 2: Specifications to -40°C are guaranteed by design, not production tested.
Typical Operating Characteristics
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.)
3.31
1.0
0.5
3.29
3.28
3.27
3.32
3.31
3.30
3.29
3.25
3.28
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
100 200 300 400 500 600 700 800
-40
-15
10
35
60
TEMPERATURE (°C)
DROPOUT VOLTAGE vs. LOAD CURRENT
DROPOUT VOLTAGE
vs. OUTPUT VOLTAGE
GROUND-PIN CURRENT
vs. INPUT VOLTAGE
MAX1935 toc04
350
250
TA = +25°C
200
150
100
0.28
DROPOUT VOLTAGE (V)
TA = +85°C
300
TA = -40°C
0.26
0.24
0.22
0.20
0.18
0.16
50
0
100 200 300 400 500 600 700 800
LOAD CURRENT (mA)
600
550
500
450
400
350
300
250
200
150
100
50
85
IOUT = 500mA
IOUT = 0mA
0
0.14
0
GROUND-PIN CURRENT (µA)
LOAD CURRENT (mA)
MAX1935 toc05
INPUT VOLTAGE (V)
400
4
3.33
3.26
0
VIN = VOUT + 500mV
IOUT = 0
MAX1935 toc06
1.5
3.30
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
IOUT = 500mA
2.0
OUTPUT VOLTAGE vs. TEMPERATURE
3.34
MAX1935 toc02
MAX1935 toc01
IOUT = 0mA
3.0
2.5
OUTPUT VOLTAGE vs. LOAD CURRENT
3.32
MAX1935 toc03
OUTPUT VOLTAGE vs. INPUT VOLTAGE
3.5
DROPOUT VOLTAGE (mV)
MAX1935
500mA, Low-Voltage Linear Regulator
in Tiny QFN
2.0
2.5
3.0
3.5
OUTPUT VOLTAGE (V)
4.0
4.5
2.0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
_______________________________________________________________________________________
5.0
5.5
6.0
500mA, Low-Voltage Linear Regulator
in Tiny QFN
GROUND-PIN CURRENT
vs. LOAD CURRENT
350
VIN = 3.8V
300
250
200
190
MAX1935 toc09
-60
MAX1935 toc08
VIN = VOUT + 500mV
IOUT = 0
-50
-40
PSRR (dB)
VIN = 5.5V
GROUND-PIN CURRENT (µA)
450
180
170
-30
-20
160
-10
COUT = 10µF
IOUT = 50mA
150
0
150
100
-40
-15
100 200 300 400 500 600 700 800
10
35
60
0.01
85
0.1
1
10
100
1000
FREQUENCY (kHz)
TEMPERATURE (°C)
LOAD CURRENT (mA)
OUTPUT SPECTRAL NOISE DENSITY
vs. FREQUENCY
OUTPUT NOISE DC TO 1MHz
COUT = 10µF
IOUT = 50mA
MAX1935 toc10
MAX1935 toc11
10
OUTPUT SPECTRAL NOISE DENSITY (µV/√Hz)
1
VOUT
1mV/div
0.1
0.01
VOUT = 3.3V
ROUT = 66Ω (50mA)
0.001
0.1
1
10
100
1000
20ms/div
FREQUENCY (kHz)
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
LOAD-TRANSIENT RESPONSE
MAX1935 toc13
100
MAX1935 toc12
0
REGION OF COUT ESR
GROUND-PIN CURRENT (µA)
200
MAX1935 toc07
500
400
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
GROUND-PIN CURRENT
vs. TEMPERATURE
IOUT
200mA/div
10
COUT = 10µF
1
VOUT
20mV/div
STABLE REGION
0.1
VIN = VOUT + 500mV
CIN = 10µF
ROUT = 660Ω TO 6.6Ω (5mA TO 500mA)
0.01
0
100 200 300 400 500 600 700 800
10µs/div
FREQUENCY (kHz)
_______________________________________________________________________________________
5
MAX1935
Typical Operating Characteristics (continued)
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.)
MAX1935
500mA, Low-Voltage Linear Regulator
in Tiny QFN
Typical Operating Characteristics (continued)
(VOUT = 3.3V, VIN = VOUT + 500mV, SHDN = IN, CIN = 1µF, COUT = 10µF, TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
LINE-TRANSIENT RESPONSE
MAX1935 toc15
MAX1935 toc14
6V
VIN
1V/div
IOUT
200mA/div
3V
VOUT
50mV/div
VIN = VOUT + 100mV
CIN = 10µF
ROUT = 660Ω TO
6.6Ω (5mA TO 500mA)
VOUT
10mV/div
200µs/div
10µs/div
SHUTDOWN WAVEFORM
POK WAVEFORM
MAX1935 toc16
MAX1935 toc17
5V
2V
VSHDN
1V/div
VIN
2V/div
0
0
3V
VOUT
2V/div
VOUT
1V/div
0
VPOK
2V/div
0
0
ROUT = 6.6Ω (500mA)
ROUT = 66Ω (50mA)
20µs/div
200µs/div
Pin Description
6
PIN
NAME
FUNCTION
1, 2
IN
Regulator Input. Supply voltage can range from 2.25V to 5.5V. Bypass with a 1µF capacitor to GND (see
the Capacitor Selection and Regulation Stability section). Connect both input pins together externally.
3
POK
Open-Drain, Active-Low Power-OK Output. POK remains low while the output voltage (VOUT) is below the
POK threshold. Connect a 100kΩ pullup resistor from POK to OUT.
4
SHDN
Active-Low Shutdown Input. A logic low at SHDN reduces supply current to 0.02µA. In shutdown, the POK
output is low. Connect SHDN to IN for normal operation.
5
GND
Ground. This pin and the exposed pad also function as a heatsink. Solder both to a large pad or to the
circuit-board ground plane to maximize power dissipation.
6
SET
Voltage-Setting Input. Connect SET to GND for preset output. Connect an external resistive voltage-divider
from OUT to SET to set the output voltage between 0.8V and 4.5V. The SET regulation voltage is 800mV.
7, 8
OUT
Regulator Output. OUT sources up to 500mA. Bypass OUT with a 10µF low-ESR capacitor to GND.
Connect both OUT pins together externally.
_______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator
in Tiny QFN
The MAX1935 is a low-dropout, low-quiescent-current
linear regulator. The device supplies loads up to
500mA and is available with preset output voltages. As
illustrated in Figure 1, the MAX1935 includes a 0.8V reference, error amplifier, P-channel pass transistor, and
internal feedback voltage-divider.
The reference is connected to the error amplifier, which
compares it with the feedback voltage and amplifies
the difference. If the feedback voltage is lower than the
reference voltage, the pass-transistor gate is pulled
lower, which allows more current to pass to the output
increasing the output voltage. If the feedback voltage is
too high, the pass-transistor gate is pulled up, allowing
less current to pass to the output.
The output voltage is fed back through either an internal
resistive voltage-divider connected to OUT or an
external resistor network connected to SET. The dualmode comparator examines VSET and selects the feedback path. If VSET is below 35mV, the internal feedback
path is used, and the output is regulated to the factorypreset voltage. Additional blocks include an output
current limiter, thermal sensor, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX1935 features a 0.4Ω P-channel MOSFET pass
transistor. Unlike similar designs using PNP pass
transistors, P-channel MOSFETs require no base drive,
which reduces operating current. PNP-based regulators
also waste considerable current in dropout when the
pass transistor saturates, and use high base-drive
currents under large loads. The MAX1935 does not
suffer from these problems.
Output Voltage Selection
The MAX1935’s dual-mode operation allows operation
in either a preset voltage mode or an adjustable mode.
Connect SET to GND to select the preset output
voltage. The two-digit part number suffix identifies the
output voltage. For example, the MAX1935ETA33 has a
preset 3.3V output voltage. The output voltage can also
be adjusted by connecting a voltage-divider from OUT
to SET (Figure 2). Select R2 in the 25kΩ to 100kΩ
range. Calculate R1 with the following equation:
R1 = R2 [(VOUT / VSET) - 1]
where VSET = 0.8V, and VOUT can range from 0.8V
to 4.5V.
Shutdown
Drive SHDN low to enter shutdown. During shutdown,
the output is disconnected from the input, and supply
current drops to 0.02µA. When in shutdown, POK pulls
low. The capacitance and load at OUT determine the
rate at which VOUT decays. SHDN can be pulled as
high as 6V, regardless of the input and output voltage.
Power-OK Output
The POK output pulls low when OUT is less than 93% of
the nominal regulation voltage. Once OUT exceeds
93% of the nominal voltage, POK goes high impedance. POK is an open-drain N-channel output. To
obtain a logic voltage output, connect a pullup resistor
from POK to OUT. A 100kΩ resistor works well for most
applications. POK can be used to signal a microcontroller (µC), or drive an external LED to indicate power
failure. When the MAX1935 is shutdown, POK is held
low independent of the output voltage. If unused, leave
POK grounded or unconnected.
Current Limit
The MAX1935 monitors and controls the pass transistor’s gate voltage, limiting the output current to 1.4A
(typ). The output can be shorted to ground for an indefinite period of time without damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX1935. When the junction temperature
exceeds TJ = +170°C, a thermal sensor turns off the
pass transistor, allowing the device to cool. The thermal
sensor turns the pass transistor on again after the junction temperature cools by +20°C, resulting in a pulsed
output during continuous thermal-overload conditions.
Thermal-overload protection protects the MAX1935 in
the event of fault conditions. For continuous operation,
do not exceed the absolute maximum junction-temperature rating of TJ = +150°C.
Operating Region and Power Dissipation
The MAX1935’s maximum power dissipation depends
on the thermal resistance of the IC package and circuit
board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
power dissipated in the device is P = IOUT ✕ (VIN V OUT ). The maximum allowed power dissipation is
1.95W or:
PMAX = (TJ(MAX) - TA) / (θJC + θCA)
where TJ - TA is the temperature difference between the
MAX1935 die junction and the surrounding air, θJC is
the thermal resistance from the junction to the case, and
θCA is the thermal resistance from the case through the
PC board, copper traces, and other materials to the surrounding air. The MAX1935 package features an
exposed thermal pad on its underside. This pad lowers
the package’s thermal resistance by providing
_______________________________________________________________________________________
7
MAX1935
Detailed Description
MAX1935
500mA, Low-Voltage Linear Regulator
in Tiny QFN
VIN
2.25V TO 5.5V
IN
CIN
1µF
IN
THERMAL
SENSOR
MOSFET
DRIVER WITH
ILIM
PRESET MODE
OUT
ON
VOUT
0.8V TO 3.3V
SHDN
OUT
OFF
SHUTDOWN
LOGIC
COUT
10µF
VREF
0.8V
ERROR
AMPLIFIER
LOGIC SUPPLY
VOLTAGE (VOUT)
RPOK
100kΩ
MAX1935
POK
TO
µC
SET
93% VREF
80mV
GND
Figure 1. Functional Diagram
a direct heat conduction path from the die to the PC
board. Connect the exposed backside pad and GND to
the system ground using a large pad or ground plane,
or multiple vias to the ground plane layer.
The MAX1935 delivers up to 0.5A(RMS) and operates
with input voltages up to 5.5V, but not simultaneously.
High output currents can only be sustained when inputoutput differential is within the limits outlined.
output capacitors. The output capacitor’s (COUT) ESR
affects stability and output noise. Use output capacitors
with an ESR of 0.1Ω or less to ensure stability and optimum transient response. Surface-mount ceramic
capacitors have very low ESR and are commonly available in values up to 10µF. Connect CIN and COUT as
close to the MAX1935 as possible.
Applications Information
The MAX1935 is designed to operate with low dropout
voltages and low quiescent currents, while still
maintaining good noise, transient response, and AC
rejection. See the Typical Operating Characteristics for
a plot of Power-Supply Rejection Ratio (PSRR) vs.
Frequency. When operating from noisy sources,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors and through passivefiltering techniques. The MAX1935 load-transient
Capacitor Selection and Regulator
Stability
Connect a 1µF capacitor between IN and ground and a
10µF low equivalent series-resistance (ESR) capacitor
between OUT and ground. The input capacitor (CIN)
lowers the source impedance of the input supply.
Reduce noise and improve load-transient response,
stability, and power-supply rejection by using larger
8
Noise, PSRR, and Transient Response
_______________________________________________________________________________________
500mA, Low-Voltage Linear Regulator
in Tiny QFN
MAX1935
600
IN
OUT
IN
OUT
0.8V
VIN
+2.25V TO +5.5V
-1
VOUT
CIN
1µF
COUT
10µF
MAX1935
R1
ON
SHDN
TA = +70°C
MAXIMUM OUTPUT CURRENT (A)
R1 = R2
VOUT
500
400
TA = +85°C
300
200
100
SET
OFF
0
0
R2
POK
GND
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT-OUTPUT VOLTAGE DIFFERENCE (V)
Figure 3. Power Operating Regions: Maximum Output Current
vs. Input-Output Voltage Difference
Figure 2. Adjustable Output Using External Feedback Resistors
response graphs (see the Typical Operating
Characteristics) show two components of the output
response: a DC shift from the output impedance due to
the load current change, and the transient response. A
typical transient overshoot for a step change in the load
current from 5mA to 500mA is 40mV. Increasing the
output capacitor’s value and decreasing the ESR
attenuates the overshoot.
Input-Output (Dropout) Voltage
A regulator’s minimum input-to-output voltage differential
(dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines the
useful end-of-life battery voltage. Because the MAX1806
uses a P-channel MOSFET pass transistor, its dropout
voltage is a function of drain-to-source on-resistance
(RDS(ON)) multiplied by the load current (see the Typical
Operating Characteristics):
VDROPOUT = VIN - VOUT = RDS(ON) ✕ IOUT
Chip Information
TRANSISTOR COUNT: 949
_______________________________________________________________________________________
9
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
6, 8, &10L, QFN THIN.EPS
MAX1935
500mA, Low-Voltage Linear Regulator
in Tiny QFN
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
COMMON DIMENSIONS
SYMBOL
A
MIN.
0.70
MAX.
0.80
D
2.90
3.10
E
2.90
3.10
A1
0.00
0.05
L
k
0.20
0.40
0.25 MIN
A2
0.20 REF.
PACKAGE VARIATIONS
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
T633-1
6
1.50–0.10
2.30–0.10
0.95 BSC
MO229 / WEEA
0.40–0.05
1.90 REF
T833-1
8
1.50–0.10
2.30–0.10
0.65 BSC
MO229 / WEEC
0.30–0.05
1.95 REF
T1033-1
10
1.50–0.10
2.30–0.10
0.50 BSC
MO229 / WEED-3
0.25–0.05
2.00 REF
[(N/2)-1] x e
PACKAGE OUTLINE, 6, 8 & 10L,
QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm
21-0137
C
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implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
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