Maxim MAX1759EUB Datasheet

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General Description
The MAX1759 is a buck/boost regulating charge pump that generates a regulated output voltage from a single lithium-ion (Li+) cell, or two or three NiMH or alkaline cells for small hand-held portable equipment. The MAX1759 operates over a wide +1.6V to +5.5V input voltage range and generates a fixed 3.3V or adjustable (2.5V to 5.5V) output (Dual Mode™). Maxim’s unique charge-pump architecture allows the input voltage to be higher or lower than the regulated output voltage. Despite its high 1.5MHz operating frequency, the MAX1759 maintains low 50µA quiescent supply current.
Designed to be an extremely compact buck/boost con­verter, this device requires only three small ceramic capacitors to build a complete DC-DC converter capa­ble of generating a guaranteed 100mA (min) output current from a +2.5V input. For added flexibility, the MAX1759 also includes an open-drain power-OK (POK) output that signals when the output voltage is in regulation.
The MAX1759 is available in a space-saving 10-pin µMAX package that is 1.09mm high and half the size of an 8-pin SO.
Applications
Li+ Battery-Powered Applications
Miniature Equipment
Backup Battery Boost Converters
Translators
Features
Regulated Output Voltage (Fixed 3.3V or
Adjustable 2.5V to 5.5V)
100mA Guaranteed Output Current
+1.6V to +5.5V Input Voltage Range
Low 50µA Quiescent Supply Current
1µA Shutdown Mode
Load Disconnected from Input in Shutdown
High 1.5MHz Operating Frequency
Uses Small Ceramic Capacitors
Short-Circuit Protection and Thermal Shutdown
Small 10-Pin µMAX Package
MAX1759
Buck/Boost Regulating
Charge Pump in µMAX
________________________________________________________________ Maxim Integrated Products 1
Typical Operating Circuit
19-1600; Rev 0; 1/00
PART
MAX1759EUB -40°C to +85°C
TEMP. RANGE PIN-PACKAGE
10 µMAX
Pin Configuration
Ordering Information
Dual Mode is a trademark of Maxim Integrated Products.
C
X
IN
+1.6V TO +5.5V
C
IN
ON
OFF
CXN CXP
IN
MAX1759
SHDN
OUT
POK
PGNDGNDFB
OUT
3.3V AT 100mA
POWER OK
TOP VIEW
1
POK
2
C
OUT
SHDN
3
IN
4
5
10
FB
9
MAX1759
µMAX
OUT
8
CXP
7
CXNIN
PGNDGND
6
MAX1759
Buck/Boost Regulating Charge Pump in µMAX
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN= V
SHDN
= 2V, FB = PGND = GND, CIN= 10µF, CX= 0.33µF, C
OUT
= 10µF, TA= 0°C to +85°C, unless oth-
erwise noted. Typical values are at T
A
= +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, OUT, FB, POK, SHDN to GND............................-0.3V to +6V
PGND to GND.....................................................................±0.3V
CXN to GND ................................................-0.3V to (V
IN
+ 0.3V)
CXP to GND..............................................-0.3V to (V
OUT
+ 0.3V)
OUT Short to GND .........................................................Indefinite
Continuous Power Dissipation (T
A
= +70°C)
10-Pin µMAX (derate 5.6mW/°C above +70°C) .........444mW
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
I
LOAD,MAX
Thermal Shutdown Hysteresis
20
°C
Efficiency
90
%VIN= 3.6V, I
LOAD
= 10mA
PARAMETER SYMBOL MIN TYP MAX UNITS
Transient Load Current
200
mA
Maximum Output Current
100
mA
3.17 3.3 3.43
Output Voltage V
OUT
3.17 3.3 3.43
V
Quiescent Supply Current I
Q
50 90
85 180
µA
Shutdown Supply Current I
Q,SHDN
15
µA
Leakage Current into OUT in Shutdown
15
µA
Input Undervoltage Lockout Voltage
Input Voltage Range V
IN
1.6 5.5
V
V
UVLO
0.6 1.0 1.4
V
Output Voltage Adjustment Range
2.5 5.5
V
SHDN Logic Input Voltage
V
IL
0.25 · V
IN
V
V
IH
0.7 · V
IN
SHDN Input Leakage Current
I
SHDN
-1 1
µA
FB Regulation Voltage V
FB
1.205 1.235 1.265
V
FB Input Current
25 200
nA
FB Dual-Mode Threshold
100 50
mV
200 100
mV
POK Trip Voltage
1.0 1.1 1.2
V
POK Output Low Voltage V
OL
5100
mV
POK Leakage Current
0.01 0.2
µA
Switching Frequency f
OSC
1.2 1.5 1.8
MHz
Output Short-Circuit Current
110
mA
Thermal Shutdown Temperature
160
°C
CONDITIONS
1.6V ≤ VIN≤ 5.5V
I
LOAD
100mA (RMS)
1.6V ≤ VIN≤ 5.5V
2.5V ≤ VIN≤ 5.5V
2.5V ≤ VIN≤ 5.5V, 1mA ≤ I
LOAD
100mA
2V ≤ VIN≤ 5.5V, 1mA ≤ I
LOAD
50mA
VIN= V
SHDN
= 4V, VFB= 0, stepping down
VIN= V
SHDN
= 2V, VFB= 0, stepping up
V
SHDN
= 5.5V
VIN= 1.65V, V
OUT
= 3.3V
1.6V ≤ VIN≤ 5.5V, V
SHDN
= 0
VIN= 2V, V
OUT
= 3.3V, V
SHDN
= 0
VFB= 1.27V
Internal feedback
External feedback
Falling edge at FB
I
SINK
= 0.5mA, VIN= 2V
V
POK
= 5.5V, VFB= 1.27V
1.6V ≤ VIN≤ 5.5V
1.6V ≤ VIN≤ 5.5V, VFB= 1V
V
OUT
= 0, 2.5V ≤ VIN≤5.5V, foldback current limit
Rising temperature
MAX1759
Buck/Boost Regulating
Charge Pump in µMAX
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VIN= V
SHDN
= 2V, FB = PGND = GND, CIN= 10µF, CX= 0.33µF, C
OUT
= 10µF, TA= -40°C to +85°C, unless oth-
erwise noted.) (Note 1)
Note 1: Specifications to -40°C are guaranteed by design and are not production tested.
PARAMETER
SYMBOL MIN MAX UNITS
Quiescent Supply Current I
Q
90
Maximum Output Current I
LOAD,MAX
100
mA
Output Voltage Adjustment Range
2.5 5.5
V
3.15 3.45
V
180
µA
Shutdown Supply Current I
Q,SHDN
6
µA
Leakage Current into OUT in Shutdown
5
µA
SHDN Input Logic Voltage
V
IL
0.2 · V
IN
V
Input Undervoltage Lockout Voltage
Input Voltage Range V
IN
1.6 5.5
V
V
UVLO
0.6 1.4
V
Output Voltage V
OUT
3.15 3.45
V
V
IH
0.7 · V
IN
V
SHDN Input Leakage Current
I
SHDN
-1 1
µA
FB Regulation Voltage V
FB
1.205 1.265
V
FB Input Bias Current
200
nA
FB Dual Mode Threshold
40
mV
200
mV
POK Trip Voltage
1.0 1.2
V
POK Output Low Voltage V
OL
100
mV
POK Leakage Current
0.2
µA
Switching Frequency f
OSC
1.1 1.9
MHz
CONDITIONS
1.6V ≤ VIN≤ 5.5V
VIN= V
SHDN
= 4V, VFB= 0
V
SHDN
= 5.5V
2.5V ≤ VIN≤ 5.5V
1.6V ≤ VIN≤ 5.5V
2.5V ≤ VIN≤ 5.5V, 0 ≤ I
LOAD
100mA
VIN= V
SHDN
= 2.5V, VFB= 0
1.6V ≤ VIN≤ 5.5V, V
SHDN
= 0
VIN= 1.65V, V
OUT
= 3.3V
VFB= 1.27V
VIN= 2V, V
OUT
= 3.3V, V
SHDN
= 0
1.6V ≤ VIN≤ 5.5V
Internal feedback
External feedback
Falling edge at FB
I
SINK
= 0.5mA, VIN= 2V
V
POK
= 5.5V
1.6V ≤ VIN≤ 5.5V, VFB= 1V
2V ≤ VIN≤ 5.5V, 0 ≤ I
LOAD
50mA
MAX1759
Buck/Boost Regulating Charge Pump in µMAX
4 _______________________________________________________________________________________
Typical Operating Characteristics
(Circuit of Figure 1, CIN= 10µF, CX= 0.33µF, C
OUT
= 10µF, V
OUT
= 3.3V, VIN= 2.5V, TA= +25°C, unless otherwise noted.)
0
20
60
40
80
100
1.5 2.5 3.5 4.5 5.5
OUTPUT VOLTAGE RIPPLE
vs. INPUT VOLTAGE
MAX1759 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE RIPPLE (mV)
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX1759 toc02
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.40
3.20
3.25
3.30
3.35
0.001 1 10 1000.01 0.1 1000
0
20
10
40
30
60
50
70
90
80
100
1.5 2.5 3.5 4.5 5.5
EFFICIENCY vs. INPUT VOLTAGE
MAX1759 toc03
INPUT VOLTAGE (V)
EFFICIENCY (%)
I
OUT
= 10mA
I
OUT
= 50mA
I
OUT
= 100mA
0.5 1.5 2.5 3.5 4.5 5.5
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX1759 toc04
INPUT VOLTAGE (V)
QUIESCENT CURRENT (µA)
10,000
1
10
100
1000
NO LOAD
4
3
2
1
0
0.5 2.51.5 3.5 4.5 5.5
STARTUP INPUT VOLTAGE
(V
OUT
< VIN)
MAX1759 toc05
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
R
LOAD
= 33
1
3
2
5µs/div
TYPICAL SWITCHING WAVEFORMS
(V
OUT
< VIN)
MAX1759 toc06
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: V
CXP
, 5V/div
CH3: V
IN
, 50mV/div, AC-COUPLED
R
LOAD
= 33
V
IN
= 4.2V
1
3
2
5µs/div
TYPICAL SWITCHING WAVEFORMS
(V
OUT
> VIN)
MAX1759 toc07
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: V
CXP
, 5V/div
CH3: V
IN
, 50mV/div, AC-COUPLED
R
LOAD
= 33
V
IN
= 2.5V
1
2
100µs/div
LOAD-TRANSIENT RESPONSE
(V
OUT
< VIN)
MAX1759 toc08
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: I
OUT
, 100mA/div
LOAD STEP: 10mA TO 100mA V
IN
= 4.2V
1
2
100µs/div
LOAD-TRANSIENT RESPONSE
(V
OUT
> VIN)
MAX1759 toc09
CH1: V
OUT
, 20mV/div, AC-COUPLED
CH2: I
OUT
, 100mA/div
LOAD STEP: 10mA TO 100mA V
IN
= 2.5V
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