Product Specification
IXD2135/IXD2136
Synchronous 1A Step-Up DC/DC Converter
FEATURES
Operating Input Voltage Range:
0.65 V ~
6.5 V
Output Voltage Range:
1.8 V~5.0V with
(0.1V increments, accuracy ±2.0%)
Oscillation Frequency:
1.2 MHz ± 15%
Built-in Switching 0.2 Ω NMOSFET
Build-in Synchronous Rectification 0.2 Ω
PMOSFET
Operating Mode:
PWM or PWM/PFM Auto
Selection
Protection:
Over-Current Limit Latch,
Thermal Shutdown
Functions:
Under-Voltage Lockout, Soft
Start, Load Disconnect, Load Capacitor Auto
Discharge,
Operating Ambient Temperature:
-40 -
0
+85 C
Package:
USP-10B (10-pin 2.6 x 2.9 x 0.6
mm)
EU RoHS Compliant, Pb Free
Mobile phones
Cameras, VCRs
Various portable equipment powered from 1
– 3 cell alkaline or 1 cell Li-ion batteries
transistor and a 0.2 Ω synchronous P-channel
transistor capable of providing up to 1.0 A inductor
peak current.
The IXD2135/36 converters are able to start
operation at 0.9 V input voltage to generate 3.3 V
output voltage with a 33 Ω load resistor, which is
suitable for mobile equipment powered from a single
alkaline or nickel metal hydride battery.
The load disconnect function cuts the current
conduction path from input to output at shutdown
mode.
The output voltage is selectable in 0.1 V increments
within 1.8 ~ 5.0 V (± 2.0% accuracy).
The Under-voltage Lockout (UVLO) function prevents
battery damage due deep discharge.
The UVLO threshold voltage is 0.85 V (B/K versions)
or 1.6V A/C versions), and are selectable in the
range from 0.9 V to 3.0 V.
The IXD2135/36 requires only inductor and three
ceramic capacitors connected externally for normal
operations.
Maximum oscillation frequency is set at 1.2 MHz in
PWM mode and maximum duty cycle is set at 93%,
making it suitable for use with large load current. The
IXD2135/36 converters are able to switch
automatically between PWM and PFM modes to
support both large and small load currents.
These IXD2135/36 converters use small 10-pin 2.6 x
2.9 x 0.6 mm USP-10B packages.
APPLICATION
DESCRIPTION
The IXD2135/36 are synchronous step-up DC/DC
converters with build-in a 0.2 Ω N-channel switching
TYPICAL APPLICATION CIRCUIT
TYPICAL PERFORMANCE CHARACTERISTIC
Efficiency vs. Output Current
IXD2135C32CDR-G (V
OUT
=3.2V)
L = 4.7 μH (VLF3014ST-4R7M1R1), C
L
= 22 μF (LMK316ABJ226ML), C
IN
= 10 μF (JMK212ABJ106KG),
C
DD
= 0.47 μF (TMK107BJ474KA) f
OSC
=1.2MHz
PS036201-0615
PRELIMINARY
1
Product Specification
IXD2135/IXD2136
ABSOLUTE MAXIMUM RATINGS
PARAMETER
V
OUT
Voltage
Lx Pin Voltage
Lx Pin Current
FO Pin Voltage
FO Pin Current
C
DF
Pin Voltage (IXD2135 only)
V
IN
Pin Voltage
EN Pin Voltage
Power Dissipation
USP-10B
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
OUT
V
Lx
I
Lx
V
FO
I
FO
V
CDF
V
IN
V
EN
P
D
T
OPR
T
STG
RATINGS
– 0.3 ~ 7.0
– 0.3 ~ V
OUT
+ 0.3
±2000
– 0.3 ~ 7.0
10
– 0.3 ~ 7.0
– 0.3 ~ 7.0
– 0.3 ~ 7.0
150
– 40 ~ + 85
– 55 ~ +125
mW
0
0
UNITS
V
V
mA
V
mA
V
V
C
C
ELECTRICAL OPERATING CHARACTERISTICS
IXD2135A/C
PARAMETER
Input Voltage
Output Voltage
Operating
Start Voltage
Supply Current
V
IN
Pin
Current
Standby
Current
IXD2135A/C
IXD2135/B
IXD2135A
IXD2135/B
IXD2135/C
I
LxL
f
OSC
D
MAX
D
MIN
I
PFM
EFFI
R
LXP
R
LXN
I
LIM
t
LAT
t
SS
T
SD
T
HYS
7)
Ta = 25
0
C
SYMBOL
V
IN
V
OUT
IXD2135A/C
IXD2135/B
V
HLD
I
Q
I
VIN
V
IN
= V
OUT(E)
– 0.2 V, V
EN
= 3,3 V
V
ST1
V
IN
= V
UVLO_R(E)
,
R
L
in respect with Table F1
V
MODE
= 0, V
OUT
≤ 3.3 V I
OUT
= 100 mA
V
MODE
= 0, V
OUT
> 3.3 V I
OUT
= 50 mA
R
L
= 1 kΩ, V
MODE
= 0 V
0.7
-
E2
1.1
1.5
0.2
I
STB
V
IN
= V
OUT(E),
V
EN
= 0 V
V
IN
= V
LX
= V
OUT(E)
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
OUT(E)
+ 0.5 V,
R
L
in respect with Table F1
V
MODE
= 0 V, R
L
in respect with Table F1
I
OUT
= 100 mA, V
MODE
= 0 V, V
FO
- open
I
OUT
= 200 mA
3)
1.02
86.5
0.2
1.0
0.1
1.20
93.0
4.0
6.0
3.5
4.5
6.0
2.0
1.38
98.0
0
250
93
0.20
0.20
1)
E3
V
IN
= V
OUT(E)
/2
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2,
V
OUT
= V
OUT(E)
x 0.95
0.5
2.6
2.0
5.0
150
20
V
IN
= V
OUT
= 2.0 V
5)
CONDITIONS
MIN.
TYP.
E1
MAX.
5.5
UNIT
V
V
CIRCUIT
-
V
UVLO_R1)
0.9
-
1)
V
V
µA
µA
Operating Hold Voltage
µA
µA
MHz
%
%
mA
%
Ω
Ω
A
ms
ms
0
0
Lx Leakage Current
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
PFM Switching Current
Efficiency
2)
Lx Switch P-channel ON
Resistance
Lx Switch N-channel ON
Resistance
4)
Maximum Current Limit
Integral Latch Time
Soft Start Time
13)
Thermal Shutdown
Temperature
Thermal Hystetresis
C
L
Discharge Resistance
FO ON Resistance
6)
FO Leakage Current
12)
350
0.35
1)
0.35
1)
4.0
8.5
C
C
R
DCH
R
FO
I
FOL
100
100
100
200
200
150
0
400
250
200
1
Ω
Ω
µA
V
EN
= 3.3 V, V
FO
= 0.5 V, V
OUT(E)
< 3.3 V
V
EN
= 3.3 V, V
FO
= 0.5 V, V
OUT(E)
≥ 3.3 V
V
FO
= 5.5 V
PS036201-0615
PRELIMINARY
2
Product Specification
IXD2135/IXD2136
EN HIGH Voltage
8)
EN LOW Voltage
9)
10)
V
ENH
V
ENL
V
MODEH
V
MODEL
I
ENH
I
ENL
I
MODEH
I
MODEL
V
UVLO_R
V
UVLO_H
V
LVP
t
DF
11)
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
R
L
in respect with Table F1
R
L
in respect with Table F1
V
IN
= V
EN
= 5.5 V
V
IN
= 5.5 V, V
EN
= 0 V
V
IN
= V
EN
= V
MODE
= 5.5 V
V
IN
= V
EN
= 5.5 V, V
MODE
= 0 V
R
L
= 1 kΩ
0.75
0
0.75
0
-0.1
-0.1
1.552
0.799
0.1
0.05
1.4
0.5
1.600
0.850
0.14
0.14
1.5
1.0
5.5
0.2
5.5
0.2
0.1
0.2
0.1
0.2
1.648
0.901
0.2
0.2
1.6
1.5
V
V
V
V
µA
µA
µA
µA
V
V
V
V
V
ms
MODE HIGH Voltage
MODE LOW Voltage
EN HIGH Current
EN LOW Current
MODE HIGH Current
MODE LOW Current
UVLO Release
Voltage
14)
UVLO
Hysteresis
15)
IXD2135A/C
IXD2135/B
IXD2135A/C
IXD2135/B
18)
VOUT Drop Protection
16, 17)
UVLO Detect Delay
NOTE:
External Components： C
IN
= 10 μF(ceramic), L = 2.2 μH (VLCF4020 TDK), C
DD
= 0.47 μF (ceramic), C
L
= 22 μF (ceramic), C
DF
= 1000 pF
(ceramic)
Test Conditions
For the Circuit No.1, unless otherwise stated, V
IN
= (V
OUT (E)
+ V
UVLO_R (E)
)/2, V
EN
= V
MODE
= V
FO
= 3.3 V
For the Circuit No.2, unless otherwise stated, V
IN
= V
EN
= V
OUT (E)
+ 0.5 V, V
MODE
= 0 V (GND connected), C
DF
: OPEN
For the Circuit No.3, unless otherwise stated, V
OUT
= V
EN
= V
MODE
= 0 V (GND connected), C
DF
: OPEN
For the Circuit No.4, unless otherwise stated, V
OUT
= V
EN
= V
MODE
= 0 V (GND connected), C
DF
: OPEN
For the Circuit No.5, unless otherwise stated, V
IN
= V
PULL
= 1.5 V, V
OUT
= V
EN
= V
MODE
= V
FO
= V
OUT (E)
- 0.1 V,
For the Circuit No.6, unless otherwise stated, V
OUT
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 0 V (GND connected), C
DF
: OPEN
For the Circuit No.7, unless otherwise stated, V
IN
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 0 V (GND connected), CDF: OPEN
For the Circuit No.8, unless otherwise stated, V
IN
= V
LX
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 3.3 V, C
DF
: OPEN
For the Circuit No.9, unless otherwise stated, V
IN
= 1.1 V, V
OUT
= 1.6
V
, V
EN
= 3.3 V, V
MODE
= V
FB(CDF)
= 0 V (GND connected)
V
OUT (E)
= Output Voltage Setting, V
UVLO_R (E)
= UVLO Voltage Setting, V
UVLO_F
= V
UVLO_R
– V
UVLO_H
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
13)
14)
15)
16)
17)
18)
Design target value
Efficiency = [{(output voltage) X (output current)} ÷ {(input voltage) X (input current)}] X 100
L
X
SW P-channel ON resistance = (V
Lx
- V
OUT
pin test voltage)/200 mA
See testing method of L
X
SW N-channel ON resistance at test circuit description.
C
L
Discharge resistance = V
OUT
/ V
OUT
pin measurement current.
FO ON resistance = V
FO
/ FO pin measurement current.
IXD2135A/B version only
Voltage at EN pin to start oscillation
Voltage at EN pin to stop oscillation
Voltage to start PWM mode
Voltage to start PFM mode
Time to stop L
X
oscillation from moment FO = HIGH
Time to FO = LOW after V
EN
=3.3 V
Voltage to start oscillation, while V
IN
transits from 0.2 V to 3.3 V
The Voltage is a difference between V
UVLO_R
and the voltage to stop oscillation at Lx pin while V
IN
=V
UVLO_R
→ 0.2 V. R
L
= 1 kΩ
Voltage to stop oscillation, while V
OUT
= 1.7
1.3 V
IXD2135B version only
Time to stop oscillation after V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2 – 0.65 V
PS036201-0615
PRELIMINARY
3
Product Specification
IXD2135/IXD2136
ELECTRICAL OPERATING CHARACTERISTICS (Continued)
IXD2136E/N
PARAMETER
Input Voltage
Output Voltage
Operating Start Voltage
Operating Hold Voltage
Supply Current
V
IN
Pin Current
Standby
Current
IXD2136E
IXD2136N
SYMBOL
V
IN
V
OUT
V
ST1
V
HLD
I
Q
I
VIN
I
STB
I
LxL
f
OSC
D
MAX
D
MIN
I
PFM
EFFI
R
LXP
R
LXN
I
LIM
t
SS
T
SD
T
HYS
7)
Ta = 25
0
C
CONDITIONS
R
L
in respect with Table F1
RL = 1 kΩ, V
MODE
= 0
V
MODE
= 0, V
OUT
> 3.3 V I
OUT
= 50 mA
V
OUT
≤ 3.3 V I
OUT
= 100 mA
R
L
= 1 kΩ, V
MODE
= 0 V
V
IN
= V
OUT(E)
– 0.2 V, V
EN
= 3,3 V
V
IN
= V
OUT(E),
V
EN
= 0 V
V
IN
= V
LX
= V
OUT(E)
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
OUT(E)
+ 0.5 V,
R
L
in respect with Table F1
V
MODE
= 0 V, R
L
in respect with Table F1
I
OUT
= 100 mA, V
MODE
= 0 V, V
FO
- open
I
OUT
= 200 mA
3)
1.02
86.5
-
MIN.
TYP.
E1
0.85
0.9
1)
0.65
-
36
0.65
0.1
0.9
0.1
1.20
93.0
-
52
2.15
2.0
5.0
2.0
1.38
98.0
0
250
93
0.20
0.20
1)
E3
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2,
V
OUT
= V
OUT(E)
x 0.95
2.6
5.0
150
20
V
IN
= V
OUT
= 2.0 V
5)
MAX.
5.5
UNIT
V
V
V
CIRCUIT
V
µA
µA
µA
µA
MHz
%
%
mA
%
Ω
Ω
A
Lx Leakage Current
Oscillation Frequency
Maximum Duty Cycle
Minimum Duty Cycle
PFM Switching Current
Efficiency
Lx Switch P-channel ON
Resistance
Lx Switch N-channel ON
Resistance
4)
Maximum Current Limit
Soft Start Time
12)
Thermal Shutdown
Temperature
Thermal Hystetresis
C
L
Discharge Resistance
FO ON Resistance
6)
FO Leakage Current
EN HIGH Voltage
EN LOW Voltage
8)
9)
2)
350
0.35
1)
0.35
1)
8.5
ms
0
0
C
C
R
DCH
R
FO
I
FOL
V
ENH
V
ENL
V
MODEH
V
MODEL
I
ENH
I
ENL
I
MODEH
I
MODEL
100
100
100
0.75
0
0.75
0
-0.1
-0.1
200
200
150
0
400
250
200
1
5.5
0.2
5.5
0.2
0.1
0.2
0.1
0.2
Ω
Ω
µA
V
V
V
V
µA
µA
µA
µA
V
EN
= 3.3 V, V
FO
= 0.5 V, V
OUT(E)
< 3.3 V
V
EN
= 3.3 V, V
FO
= 0.5 V, V
OUT(E)
≥ 3.3 V
V
FO
= 5.5 V
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
V
IN
= V
PULL
= (V
OUT(E)
+ V
UVLO_R(E)
)/2
R
L
in respect with Table F1
R
L
in respect with Table F1
V
IN
= V
EN
= 5.5 V
V
IN
= 5.5 V, V
EN
= 0 V
V
IN
= V
EN
= V
MODE
= 5.5 V
V
IN
= V
EN
= 5.5 V, V
MODE
= 0 V
MODE HIGH Voltage
10)
MODE LOW Voltage
EN HIGH Current
EN LOW Current
MODE HIGH Current
MODE LOW Current
11)
NOTE:
External Components： C
IN
= 10 μF(ceramic), L = 2.2 μH (VLCF4020 TDK), C
DD
= 0.47 μF (ceramic), C
L
= 22 μF (ceramic)
Test Conditions
For the Circuit No.1, unless otherwise stated, Circuit No.1 V
IN
= 1.6 V, V
EN
= V
MODE
= 3.3 V
For the Circuit No.2, unless otherwise stated, Circuit No.2 V
IN
= V
EN
= V
OUT (E)
+ 0.5 V, V
MODE
= 0 V (GND connected)
For the Circuit No.3, unless otherwise stated, V
OUT
= V
EN
= V
MODE
= 0 V (GND connected)
For the Circuit No.4, unless otherwise stated, V
OUT
= V
EN
= V
MODE
= 0 V (GND connected)
For the Circuit No.5, unless otherwise stated, V
IN
= V
PULL
= 1.5 V, V
OUT
= V
EN
= V
MODE
= V
FO
= V
OUT (E)
- 0.1 V
For the Circuit No.6, unless otherwise stated, V
OUT
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 0 V (GND connected)
For the Circuit No.7, unless otherwise stated, V
IN
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 0 V
For the Circuit No.8, unless otherwise stated, V
IN
= V
LX
= V
OUT (E)
+ 0.5 V, V
EN
= V
MODE
= 3.3 V
PS036201-0615
PRELIMINARY
4
Product Specification
IXD2135/IXD2136
For the Circuit No.9, unless otherwise stated, V
IN
= 1.1 V, V
OUT
= 1.6 V, V
EN
= 3.3 V,V
MODE
= 0 V (GND connected)
V
OUT (E)
= Output Voltage Setting,
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
11)
12)
Design target value
Efficiency = [{(output voltage) X (output current)} ÷ {(input voltage) X (input current)}] X 100
L
X
SW P-channel ON resistance = (V
Lx
- V
OUT
pin test voltage)/200 mA
See testing method of L
X
SW N-channel ON resistance at test circuit description.
C
L
Discharge resistance = V
OUT
/ V
OUT
pin measurement current.
FO ON resistance = V
FO
/ FO pin measurement current.
IXD2136E version only
Voltage at EN pin to start oscillation
Voltage at EN pin to stop oscillation
Voltage to start PWM mode
Voltage to start PFM mode
Time to FO = LOW after V
EN
=3.3 V
IXD2135/36 VOLTAGE CHART
Symbol
PARAMETER
V
Output Voltage
1.8
*
1.9
*
2.0
*
2.1
*
2.2
*
2.3
*
2.4
*
2.5
*
2.6
*
2.7
*
2.8
2.9
3.0
3.1
3.2
3.3
3.4
3.5
3.6
3.7
3.8
3.9
4.0
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
5.0
*
IXD2135A/C
Table F1
E2
Supply
Current
µA
TYP
MAX
35
50
36
50
36
50
36
50
36
50
36
50
36
50
36
50
36
50
36
50
37
50
37
50
37
50
37
51
37
51
37
52
37
52
37
52
37
53
38
53
38
54
38
54
38
54
38
55
38
55
38
56
38
56
39
56
39
57
39
57
39
58
39
58
39
58
E3
Maximum Current Limit
MIN
A
TYP
0.98
1.03
1.09
1.14
1.18
1.23
1.27
1.31
1.34
1.37
1.40
1.42
1.45
1.47
1.49
1.50
1.52
1.53
1.54
1.55
1.56
1.57
1.57
1.58
1.58
1.58
1.58
1.59
1.59
1.59
1.59
1.59
1.59
MAX
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.85
1.87
1.89
1.91
1.92
1.94
1.95
1.96
1.97
1.97
1.99
1.99
1.99
1.99
2.00
2.00
2.00
2.00
2.00
2.00
V
OUT(E)
V
1.8 ≤ V
OUT(E)
< 2.1
2.1 ≤ V
OUT(E)
< 3.1
3.1 ≤ V
OUT(E)
< 4.3
4.3 ≤ V
OUT(E)
< 5
R
L
Ω
150
220
330
470
E1
Output Voltage
Error Margin
V
MIN
MAX
1.764
1.836
1.862
1.938
1.960
2.040
2.058
2.142
2.156
2.244
2.254
2.346
2.352
2.448
2.450
2.550
2.548
2.652
2.646
2.754
2.744
2.856
2.842
2.958
2.940
3.060
3.038
3.162
3.136
3.264
3.234
3.366
3.332
3.468
3.430
3.570
3.528
3.672
3.626
3.774
3.724
3.876
3.822
3.978
3.920
4.080
4.018
4.182
4.116
4.284
4.214
4.386
4.312
4.488
4.410
4.590
4.508
4.692
4.606
4.794
4.704
4.896
4.802
4.998
4.900
5.100
1.15
1.17
1.18
1.19
1.21
1.22
1.22
1.23
1.24
1.25
1.25
1.26
1.26
1.26
1.26
1.26
1.26
1.26
1.26
1.26
1.26
series are excluded.
When output voltage is lower than 2.9V, maximum current limit may decrease.
Please refer to the typical performance characteristics, graph #10 “Maximum Current Limit vs. Ambient Temperature”
PS036201-0615
PRELIMINARY
5
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