0.5V Low Input, 1A High Speed LDO Regulator withAdjustable Current Limit
GENERAL DESCRIPTION
The XC6604 series is a low voltage input (0.5V) operation and provides high accuracy ±15mV / ±20mV and can supply large
current efficiently due to its ultra low on-resistance even at low output voltages.
The series is ideally suited to the applications which require high current in low input/output voltages and consists of a N-ch
driver transistor, a voltage reference, an error amplifier, a current limiter, a fold-back circuit, a thermal shutdown (TSD) circuit, an
under voltage lock out (UVLO) circuit, a soft-start circuit and a phase compensation circuit.
Output voltage is selectable in 0.1V increments within a range of 0.5V to 1.8V using laser trimming technology and ceramic
capacitors can be used for the output stabilization capacitor (C
voltage drops as well as the output current is decreased as a function of the foldback circuit. The current limit can be
adjustable with connecting a resistor to the I
The CE function enables the output to be turned off and the series to be put in stand-by mode resulting in greatly reduced
power consumption. At the time of entering the stand-by mode, the series enables the electric charge at the output capacitor
) to be discharged via the internal switch. As a result the V
(C
L
The CE pull-down function keeps the IC to be in stand-by mode even if the CE pin is left open.
■APPLICATIONS
● Mobile phones / Smart Phones
● Digital still cameras / Video cameras
● Note PCs / Tablet PCs
● E-book Readers
● Wireless LAN
■TYPICAL APPLICATION CIRCUIT
pin.
LIM
). When the output current reaches the current limit, the output
L
pin quickly returns to the VSS level.
OUT
FEATURES
Maximum Output Current
ON Resistance
Bias Voltage Range
Input Voltage Range
Output Voltage Range
Output Voltage Accuracy
Ripple Rejection
Low Power Consumption
Stand-by Current
Under-voltage Lockout
Thermal Shutdown
Protection Circuit
Function
CE Pull-Down (Active High)
C
Operating Ambient Temperature
Output Capacitor
Packages
The voltage divided by resistors R1 and R2 is compared with the internal reference voltage by the error amplifier. The V
by the subsequent output signal. The output voltage at the V
V
pin is power supply pin for output voltage control circuit, protection circuit and CE circuit. Also, the V
BIAS
output current. V
pin is connected to a driver transistor and provides output current.
IN
In order to obtain high efficient output current through low on-resistance, please take enough V
pin is controlled and stabilized by a system of negative feedback.
OUT
pin supplies some current as
BIAS
(=V
BIAS
– V
GS
) of the driver transistor.
OUT(E)
Figure1: XC6604 Series, Type A
<Current Limiter, Short-Circuit Protection>
The XC6604 series includes a combination of a fixed current limiter circuit and a foldback short-circuit protection. When the output current
reaches the current limit, the output voltage drops and this operation makes the output current foldback to be decreased.
The current limit can be set freely with connecting a resistor to the I
LIM
pin.
Please note about the foldback circuit characteristics below;
●Output voltage may not rise when the output voltage is lower than 0V at the IC operation start.
●Current over the foldback current limit will not flow at the IC operation start.
●Please use type A (with soft-start time) to prevent from inrush current, because the circuit may not response to a drastic current change such
as the inrush current.
When the I
pin is left open, driver transistor will be forced off.
LIM
Current Limit is calculated by the following formulas.
= V
I
LIM
/ ( R
+ R
OUT(T
= V
R
LIM1
)
OUT(T
LIM1
)
) × 79645.7 [A]
LIM2
/ ( 16.3 × 10-6 ) [Ω]
: Current Limit
I
LIM
: Nominal Output Voltage
V
OUT(T)
: Internal Current Limit Resistance
R
LIM1
: External Current Limit Resistance
R
LIM2
Figure 2: XC6604 Series, Range of adjustable current limit
OUTPUT VOLTAGE RANGE ADJUSTABLE CURRENT LIMIT
V
I
OUT(T)
LIM
0.5V~1.8V 0.5A~1.3A
XC6604 Series, R
LIM2
pin is then driven
OUT
Connecting
9/30
Page 10
XC6604 Series
■OPERATIONAL DESCRIPTION (Continued)
<Soft-Start Function>
With the XC6604 (Type A), the inrush current (I
As for the XC6604, the soft-start time in the type A is optimized internally. On the other hand, the type B of the XC6604 does not have the
soft-start time function.
<Thermal Shutdown Circuit (TSD) >
When the junction temperature of the built-in driver transistor reaches the temperature limit, the thermal shutdown circuit operates and the
driver transistor will be set to OFF. The IC resumes its operation when the thermal shutdown function is released and the IC’s operation is
automatically restored because the junction temperature drops to the level of the thermal shutdown release temperature.
<Under Voltage Lock Out (UVLO) >
When the V
pin and VIN pin voltage drops, the output driver transistor is set to OFF by UVLO function to prevent false output caused by
BIAS
unstable operation of the internal circuitry. When the V
released. The driver transistor is turned ON and start to operate voltage regulation.
<CE Pin>
The XC6604 internal circuitry can be shutdown via the signal to the CE pin. In shutdown mode with CE low level voltage, the V
pulled down to the V
level via CL discharge resistance (R
SS
The CE pin has pull-down circuitry so that CE input current flows during IC operation. If the CE pin voltage is taken from V
then logic is fixed and the IC will operate normally. However, supply current may increase as a result of through current in the IC's internal
circuitry when medium voltage is input.
<C
High Speed Auto-Discharge>
L
XC6604 series can quickly discharge the electric charge at the output capacitor (C
and the V
the output capacitor (C
auto-discharge resistance (R
an output capacitor value (C
formula. Please also note R
pin when a low signal to the CE pin which enables a whole IC circuit put into OFF state. When the IC is disabled, electric charge at
SS
) is quickly discharged so that it could avoids malfunction. Discharge time of the output capacitor (CL) is set by the C
L
) and the output capacitor (CL). By setting time constant of a CL auto-discharge resistance value (R
DCHG
) as τ(τ= CL x R
L
is depended on V
DCHG
V: Output voltage during discharge
: Initial Output voltage
V
OUT(E)
t: Discharge time
τ: C
L×RDCHG
<Low ESR Capacitor>
With the XC6604 series, a stable output voltage is achievable even if used with low ESR capacitors, as a phase compensation circuit is built-in.
The output capacitor (C
) should be connected as close to V
L
phase compensation are as the table below.
For a stable power input, please connect a bias capacitor (C
) between the VIN pin and the VSS pin. In order to ensure the stable phase compensation while avoiding run-out of values, please use the
(C
IN
capacitor (C
of C
BIAS
, CIN and CL) which does not depend on bias or temperature too much. The table below (Figure 3) shows recommended values
BIAS
, CIN and CL.
Figure 3: Recommended Values of C
OUTPUT VOLTAGE
RANGE
V
C
OUT(T)
, CIN and CL (MIN.)
BIAS
BIAS CAPACITOR INPUT CAPACITOR
BIAS
0.5V~1.8V 1.0μF 1.0μF 2.2μF
) from VIN to V
RUSH
pin voltage and the VIN pin voltage rises at release voltage, the UVLO function is
BIAS
DCHG
), the output voltage after discharge via the internal transistor is calculated by the following
DCHG
. When V
BIAS
OUT(E)
×
BIAS
V = V
for charging CL at start-up can be reduced and makes the VIN stable.
OUT
) placed in parallel to R1 and R2.
BIAS
) via the internal transistor located between the V
L
is larger, R
BIAS
-t/
τ
e
or t=τln(V
pin and VSS pin to obtain stable phase compensation. Values required for the
OUT
) between the V
is smaller.
DCHG
/ V)
OUT(E)
pin and the VSS pin. Also, please connect an input capacitor
BIAS
OUTPUT
CAPACITOR
CIN CL
pin will be
OUT
pin or VSS pin
pin
OUT
) and
DCHG
L
10/30
Page 11
XC6604
Series
■NOTES ON USE
1. For temporary, transitional voltage drop or voltage rising phenomenon, the IC is liable to malfunction should the ratings be exceeded.
2. Where wiring impedance is high, operations may become unstable due to noise and/or phase lag depending on output current. Please keep
the resistance low for the V
3. Please wire the C
4. Capacitances of these capacitors (C
taken for capacitor selection to ensure stability of phase compensation from the point of ESR influence.
5. When it is used in a quite small input / output dropout voltage, output may go into unstable operation. Please test it thoroughly before using
it in production.
6. Torex places an importance on improving our products and their reliability.
We request that users incorporate fail-safe designs and post-aging protection treatment when using Torex products in their systems.
, CIN and CL as close to the IC as possible.
BIAS
, VIN and VSS wiring in particular.
BIAS
, C
BIAS
) are decreased by the influences of bias voltage and ambient temperature. Care shall be
IN, CL
11/30
Page 12
XC6604 Series
■TYPICAL PERFORMANCE CHARACTERISTICS
* Unless otherwise stated, V
(1) Output Voltage vs. Output Current
XC6604x051MR-G
0.6
(V)
0.5
OUT
0.4
0.3
0.2
0.1
Output Voltage: V
0
00.511.52
Output Current: I
XC6604x121MR-G
1.4
1.2
(V)
OUT
1
0.8
0.6
0.4
0.2
Output Voltage: V
0
00.511.52
Output Current: I
XC6604x181MR-G
2
(V)
1.5
OUT
1
0.5
Output Voltage: V
0
00.511.52
Output Current: I
* Mount conditions affect heat dissipation. Thermal shutdown
may start to operate before reaching the current limit.
BIAS=VCE
=3.6V, VIN=V
RLIM2=0kΩ
RLIM2=9.1kΩ
RLIM2=22kΩ
RLIM2=47kΩ
(A)
OUT
RLIM2=0kΩ
RLIM2=22kΩ
RLIM2=56kΩ
RLIM2=120kΩ
(A)
OUT
RLIM2=0kΩ
RLIM2=33kΩ
RLIM2=82kΩ
RLIM2=180kΩ
A)
OUT(
OUT(T)
+0.3V, I
OUT
=1mA , I
Pin= VSS, C
LIM
=1.0μF, CL=2.2μF, Ta = 25 ℃
BIAS=CIN
XC6604x051MR-G
0.1
(V)
0.08
OUT
0.06
0.04
0.02
Output Voltage: V
0
00.10.20.30.40.5
Output Current: I
XC6604x121MR-G
0.3
0.25
(V)
OUT
0.2
0.15
0.1
0.05
Output Voltage: V
0
00.10.20.30.40.5
Output Current: I
XC6604x181MR-G
0.5
(V)
0.4
OUT
0.3
0.2
0.1
Output Voltage: V
0
00.10.20.30.40.5
Output Current: I
* If start-up current is required over the current limit, IC operation will not start.
Please use the current within the range of use.
RLIM2=0kΩ
RLIM2=9.1kΩ
RLIM2=22kΩ
RLIM2=47kΩ
(A)
OUT
RLIM2=0kΩ
RLIM2=22kΩ
RLIM2=56kΩ
RLIM2=120kΩ
(A)
OUT
RLIM2=0kΩ
RLIM2=33kΩ
RLIM2=82kΩ
RLIM2=180kΩ
A)
OUT(
12/30
Page 13
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
* Unless otherwise stated, V
(2) Limit Current vs. Adjustable Resistance (3) Output Voltage vs. Bias Voltage
XC6604xxx1xR-G
1.4
1.2
(A)
1
LIM
0.8
0.6
0.4
Limit Current: I
0.2
0
050100150200
Adjustable Resistance: R
BIAS=VCE
=3.6V, VIN=V
VOUT(T)=0 .5V
VOUT(T)=1 .2V
VOUT(T)=1 .8V
(kΩ)
LIM2
OUT(T)
+0.3V, I
OUT
=1mA, I
(V)
OUT
Output Voltage: V
(V)
OUT
Output Voltage: V
Pin= VSS, C
LIM
=1.0μF, CL=2.2μF, Ta = 25 ℃
BIAS=CIN
XC6604x051xR-G
0.6
(V)
0.5
OUT
0.4
0.3
IOUT=0mA
IOUT=1mA
IOUT=100mA
0.2
0.1
Output Voltage: V
0.0
0246
Bias Voltage: V
BIAS
(V)
XC6604x121xR-G
1.4
1.2
1.0
0.8
IOUT=0mA
IOUT=1mA
IOUT=100mA
0.6
0.4
0.2
0.0
0246
Bias Vo ltage: V
BIAS
(V)
XC6604x181xR-G
2.0
1.5
IOUT=0mA
1.0
IOUT=1mA
IOUT=100mA
0.5
0.0
0246
Bias Vo ltage: V
BIAS
(V)
XC6604
Series
13/30
Page 14
XC6604 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
* Unless otherwise stated, V
(4) Output Voltage vs. Input Voltage (5) Dropout Voltage vs. Output Current
XC6604x051xR-G
0.6
(V)
0.5
OUT
0.4
0.3
0.2
0.1
Output Voltage: V
0.0
0123
Input Voltage: V
XC6604x121xR-G
1.4
1.2
(V)
OUT
1.0
0.8
0.6
0.4
0.2
Output Voltage: V
0.0
0123
Input Voltage: V
XC6604x181xR-G
2.0
(V)
1.5
OUT
1.0
0.5
Output Voltage: V
0.0
0123
Input Voltage: V
BIAS=VCE
=3.6V, VIN=V
IOUT=0mA
IOUT=1mA
IOUT=100mA
(V)
IN
IOUT=0mA
IOUT=1mA
IOUT=100mA
(V)
IN
IOUT=0mA
IOUT=1mA
IOUT=100mA
(V)
IN
OUT(T)
+0.3V, I
OUT
=1mA, I
Pin=VSS, C
LIM
=1.0μF, CL=2.2μF, Ta = 25 ℃
BIAS=CIN
XC6604x121MR-G
250
VBIAS=3.0V
200
150
VBIAS=3.3V
VBIAS=3.6V
VBIAS=4.2V
VBIAS=5.0V
100
50
Dro pout Voltage : Vdif(mV)
0
02004006008001000
Output Current: I
OUT
(mA)
XC6604xxx1MR-G
I
OUT
350
300
250
Ta=-40℃
Ta=25℃
Ta=85℃
200
150
100
50
Dro pout Voltage : Vdif(mV)
0
123456
(*1)
(V)
V
GS
(*1)
VGS is a Gate –Source voltage of the driver transistor that is defined as
- V
the value of V
BIAS
OUT(E)
.
A value of the dropout voltage is determined by the value of the V
=1A
.
GS
14/30
Page 15
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
* Unless otherwise stated, V
(6) Supply Bias Current vs. Bias Voltage (7) Supply Input Current vs. Input Voltage
XC6604x051xR-G
160
(μA)
140
BIA S
120
100
80
60
40
20
Su pply Bias Current: I
0
0123456
Bias Voltage: V
XC6604x121xR-G
160
(μA)
140
BIAS
120
100
80
60
40
20
Supply Bias Current: I
0
0123456
Bias Voltage: V
XC6604x181xR-G
160
(μA)
140
BIAS
120
100
80
60
40
20
Su pply Bias Current: I
0
0123456
Bias Voltage: V
BIAS=VCE
=3.6V, VIN=V
CIN=C
V
CE=VBIAS
Ta=-40℃
Ta=25℃
Ta=85℃
(V)
BIA S
CIN=C
V
CE=VBIAS, IOUT
Ta=-40℃
Ta=25℃
Ta=85℃
(V)
BIA S
CIN=C
V
CE=VBIAS
(V)
BIA S
OUT(T)
BIAS=CL
, I
BIAS=CL
BIAS=CL
, I
Ta=-40℃
Ta=25℃
Ta=85℃
+0.3V, I
=OPEN
=0mA
OUT
=OPEN
=0mA
=OPEN
=0mA,
OUT
OUT
=1mA, I
(μA)
IN
Su pply Input Curr e n t: I
(μA)
IN
Su pply Input Curr en t: I
(μA)
IN
Su pply Input Curr e n t: I
Pin=VSS, C
LIM
=1.0μF, CL=2.2μF, Ta = 25 ℃
BIAS=CIN
XC6604x051xR-G
CIN=C
20
Ta=-40℃
15
Ta=25℃
Ta=85℃
10
5
0
00.511.522 .53
Input Voltage: V
(V)
IN
XC6604x121xR-G
CIN=C
20
Ta=-40℃
15
Ta=25℃
Ta=85℃
10
5
0
00.511.522 .53
Input Voltage: V
(V)
IN
XC6604x181xR-G
CIN=C
20
15
10
5
Ta=-40℃
Ta=25℃
Ta=85℃
0
00.511.522 .53
Input Voltage: V
(V)
IN
BIAS=CL
BIAS=CL
BIAS=CL
=OPE N
I
OUT
=OPE N
I
OUT
=OPE N
I
OUT
XC6604
Series
=0mA
=0mA
=0mA
15/30
Page 16
XC6604 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
* Unless otherwise stated, V
(8) Output Voltage vs. Ambient Temperature (9) Supply Bias Current vs. Ambient Temperature
Power dissipation data for the USP-6C is shown in this page.
The value of power dissipation varies with the mount board conditions.
Please use this data as one of reference data taken in the described condition.
1. Measurement Condition (Reference data)
Condition: Mount on a board
Ambient: Natural convection
Soldering: Lead (Pb) free
Board: Dimensions 40 x 40 mm (1600 mm
Copper (Cu) traces occupy 50% of the board area
Material: Glass Epoxy (FR-4)
Thickness: 1.6 mm
Through-hole: 4 x 0.8 Diameter
2. Power Dissipation vs. Ambient temperature
Board Mount (Tj max = 125℃)
In top and back faces
Package heat-sink is tied to the copper traces
Ambient Temperature (℃) Power Dissipation Pd (mW) Thermal Resistance (℃/W)
2
in one side)
Evaluation Board (Unit: mm)
Power Dissipation: Pd (mW)
26/30
25 1000
85 400
Pd-Ta特性
グラフ
Pd vs. Ta
1200
1000
800
600
400
200
許容損失Pd(mW)
0
25456585105125
Ambient Temperature: Ta (℃)
周辺温度
Ta(℃)
100.00
Page 27
p
(
)
XC6604
Series
■PACKAGING INFORMATION (Continued)
● SOT-26W Power Dissipation
Power dissipation data for the SOT-26W is shown in this page.
The value of power dissipation varies with the mount board conditions.
Please use this data as one of reference data taken in the described condition.
1. Measurement Condition (Reference data)
Condition: Mount on a board
Ambient: Natural convection
Soldering: Lead (Pb) free
Board: Dimensions 40 x 40 mm (1600 mm
Copper (Cu) traces occupy 50% of the board area
Material: Glass Epoxy (FR-4)
Thickness: 1.6 mm
Through-hole: 4 x 0.8 Diameter
2. Power Dissipation vs. Ambient temperature
Board Mount (Tj max = 125℃)
Ambient Temperature (℃) Power Dissipation Pd (mW) Thermal Resistance (℃/W)
In top and back faces
Package heat-sink is tied to the copper traces
(Board of SOT-26 is used.)
2
in one side)
評価基板レイアウト(単位:mm)
Evaluation Board (Unit: mm)
25 600
85 240
Pd-Ta特性グラフ
Pd vs. Ta
700
mW
600
166.67
500
400
ation: Pd
300
200
100
許容損失Pd(mW)
Power Dissi
0
25456585105125
Ambient Temperature: Ta (℃)
周辺温度Ta(℃)
27/30
Page 28
XC6604 Series
■MARKING RULE
① represents product series
MARK PRODUCT SERIES
T XC6604A*****-G
U XC6604B*****-G
② represents output voltage
MARK OUTPUT VOLTAGE (V) MARK OUTPUT VOLTAGE (V)
A 0.5 K 1.2
B 0.6 L 1.3
C 0.7 M 1.4
D 0.8 N 1.5
E 0.9 P 1.6
F 1.0 R 1.7
H 1.1 S 1.8
③④ represents production lot number
01 to 09, 0A to 0Z, 11 to 9Z, A1 to A9, AA to Z9, B1 to ZZ in order.
(G, I, J, O, Q, W excluded)
*No character inversion used.
SOT-26W
64
5
① ② ③ ④
123
28/30
Page 29
r
■MARKING RULE (Continued)
① represents product series
MARK PRODUCT SERIES
U XC6604******-G
② represents regulator type
MARK PRODUCT SERIES
A XC6604A*****-G
B XC6604B*****-G
③ represents output voltage
MARK OUTPUT VOLTAGE (V) MARK OUTPUT VOLTAGE (V)
A 0.5 K 1.2
B 0.6 L 1.3
C 0.7 M 1.4
D 0.8 N 1.5
E 0.9 P 1.6
F 1.0 R 1.7
H 1.1 S 1.8
④⑤ represents production lot numbe
01 to 09, 0A to 0Z, 11 to 9Z, A1 to A9, AA to Z9, B1 to ZZ in order.
(G, I, J, O, Q, W excluded)
*No character inversion used.
XC6604
Series
USP-6C
1
④ ⑤
2
3
6
② ③①
5
4
29/30
Page 30
XC6604 Series
1. The products and product specifications contained herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this datasheet is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this datasheet.