LD6991/A
4/11/2008
90mA, Ultra Low Quiescent Current CMOS LDO Regulator
with Voltage Detector Circuit
REV:01b
General Description
The LD6991/A is an ultra low quiescent micropower linear
regulator with voltage detector circuit. For regulator circuit,
the precision of feedback reference voltage is within
±2%
and output current is up to 90mA. As well, it can be stable
with 1uF output capacitor which reduces the board space
and cost. For voltage detector circuit, the reset threshold
voltage accuracy is within
±2%
and the reset time period is
adjustable by an external capacitor.
Features
REGULATOR CIRCUIT
Low Dropout: 350mV @50mA
Ultra Low Quiescent Current: 5μA(typ)
Thermal Shutdown and Current Limiting Protection
Stable with 1μF Capacitor
Output Voltage: 1.5V to 3.3V (step 0.1V)
VOLTAGE DETECTOR CIRCUIT
Reset Threshold Voltage 1.2V to 3.3V (step 0.1V)
Low Supply Current:3μA (typ)
Capacitor-Adjustable Reset Timeout Period
Reset Output Options
Active-Low Open Drain (LD6991)
Active-High Open Drain (LD6991A)
LD6991/A is available in a space saving SC70-6 package.
+patent pending
Applications
Battery-Powered Equipment
Hand-Held Instruments
Typical Application
VDD
100K
V
IN
C
IN
1μF/X5R
VDD
VIN
OUT
V
O UT
LD6991
C
O UT
1μF/X5R
CD
68nF
GND
RESET#
Fig.1 Typical Application Circuit
1
Leadtrend Technology Corporation
LD6991/A-DS-01b, April 2008
LD6991/A
Pin Configuration
SC-70-6 (Top view)
VIN
VDD
RESET#
VIN
VDD
RESET
6
1
OUT
5
4
6
5
4
3
KWXZ
2
or
3
1
OUT
LWXZ
2
GND
CD
GND
CD
Product code: LD6991
Product code: LD6991A
: Year code (Binary,
= 2007,
=2008)
W: Week code
X: Regulator Output Voltage (H~Z: 1.5V~3.3V)
Z: Voltage Detector Output Voltage (E~Z:1.2~3.3V)
K:
L:
Ordering Information
Part number
LD6991 GU-XXZZ
LD6991A GU-XXZZ
Package
SC70-6
SC70-6
TOP MARK
KWXZ
LWXZ
Shipping
3000 /tape & reel
3000 /tape & reel
Note 1: The LD6991/A is Green Packaged/ ROHS compliant.
Note 2: -XX suffix for Regulator Output, from 1.5V~3.3V in 0.1V increment.
-ZZ
suffix for Reset Threshold Voltage, from 1.2V~3.3V in 0.1V increment.
Ex: LD6991GU-3019 is with 3.0V of Regulator Output and 1.9V of Reset Threshold Voltage.
2
Leadtrend Technology Corporation
LD6991/A-DS-01b, April 2008
LD6991/A
Pin Descriptions
LD6991
PIN
1
2
3
NAME
OUT
GND
CD
Regulator output
IC GND
Connect a capacitor between CD Pin and GND to set the timeout
period.
Active Low Open Drain Reset Output. RESET# changes from high to
4
RESET#
low whenever VDD drops below the selected reset threshold voltage
(VTH). RESET# remains low for the reset time out period after all reset
conditions are removed and then goes high.
5
6
VDD
VIN
Supply and Input for Voltage Detector Circuit
Input voltage for regulator circuit
FUNCTION
LD6991A
PIN
1
2
3
NAME
OUT
GND
CD
Regulator output
IC GND
Connect a capacitor between CD Pin and GND to set the timeout
period.
Active High Open Drain Reset Output. RESET changes from low to high
4
RESET
whenever VDD drops below the selected reset threshold voltage (VTH).
RESET remains high for the reset time out period after all reset
conditions are removed and then goes low.
5
6
VDD
VIN
Supply and Input for Voltage Detector Circuit
Input voltage for regulator circuit
FUNCTION
3
Leadtrend Technology Corporation
LD6991/A-DS-01b, April 2008
LD6991/A
Block Diagram
VIN
VDD
VREF
-
+
Current Limit
& Thermal
Shutdown
R1
OUT
-
+
VREF
R2
Delay
Circuit
RESET
RESET #
GND
CD
Absolute Maximum Ratings
VIN,VDD,OUT Pin
CD, RESET, RESET # Pin
Power dissipation SC70-6@Ta=25
°
C
Operating Temperature Range
Package Thermal Resistance SC70-6
Storage Temperature Range
Junction Temperature
Lead temperature (Soldering, 10sec)
ESD Level (Human Body Model)
ESD Level (Machine Model)
-0.3V~6.5V
-0.3V~(VDD+0.3)V
300mW
-30
°
C to 85
°
C
333°C/W
-55°C to 125°C
150°C
260°C
2KV
200V
Caution:
Stresses beyond the ratings specified in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only
rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not
implied.
4
Leadtrend Technology Corporation
LD6991/A-DS-01b, April 2008
LD6991/A
Electrical Characteristics
(T
A
= +25 C unless otherwise stated, V
IN
=V
OUT
+1.5V, C
IN
=C
OUT
=1μF, VDD=3.0V)
PARAMETER
REGULATOR CIRCUIT
VIN Input Voltage
VIN Quiescent current
Dropt Voltage
Output Current Limit
Output Voltage Accuracy
Line Regulation
Load Regulation
Ripple Rejection
Thermal Shutdown
Hysteresis
VOLATGE DETECTOR CIRCUIT
VDD Operating Voltage Range
V
DD
<4.5V, CD=0nF
VDD Supply Current
Reset Threshold Voltage
Reset Threshold Voltage Accuracy
Threshold
Width
Reset timeout Period
Open Drain Leakage Current
Reset Output Voltage Low (Note)
CD=68nF
CD=0nF
VDD=3V,
RESET / RESET#=5V
V
DD
=3V<V
TH
, I
SHINK
=3.5mA
0.6
33
50
25
1
75
mS
μS
μA
V
Voltage
Hysteresis
V
DD
<3.3V, CD=0nF
V
DD
<2.0V, CD=0nF
1.2
-2
0.03VTH
0.9
-
3
2.5
2
-
-
0.05VTH
6
6.5
5.5
5
3.3
2
0.08VTH
V
%
V
μA
V
I
OUT
=1mA
V
IN
=V
OUT
+1V, to 5.5V,
I
OUT
=1mA
1mA<I
OUT
<50mA
F=1KHz, EIN=1Vrms,
I
OUT
=10mA
V
OUT
short to GND
V
IN
=5V, I
OUT
=0mA
I
OUT
=1mA, V
IN
>3.6V
I
OUT
=50mA, V
IN
>3.6V
90
-2
-
-
-
0.1
0.02
40
130
20
2.0
-
5
10
350
150
6
8
25
550
-
+2
0.2
0.04
-
V
μA
mV
mV
mA
%
%/V
%/mA
dB
°C
°C
CONDITIONS
MIN
TYP
MAX
UNITS
o
Note: The voltage V
OL
can be calculated by V
OL
=V
DD
-Ir*R. where R is the pull-up resistor and Ir is the current
flowing through the pull-up resistor. For typical application (R=100KΩ), V
OL
is less than 0.2V.
5
Leadtrend Technology Corporation
LD6991/A-DS-01b, April 2008
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